WO1997044178A1 - Coextruded blown film and products made using the same - Google Patents

Coextruded blown film and products made using the same Download PDF

Info

Publication number
WO1997044178A1
WO1997044178A1 PCT/US1997/008177 US9708177W WO9744178A1 WO 1997044178 A1 WO1997044178 A1 WO 1997044178A1 US 9708177 W US9708177 W US 9708177W WO 9744178 A1 WO9744178 A1 WO 9744178A1
Authority
WO
WIPO (PCT)
Prior art keywords
blown film
layer
film
low density
density polyethylene
Prior art date
Application number
PCT/US1997/008177
Other languages
French (fr)
Inventor
William E. Heikkila
Original Assignee
Union Camp Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Union Camp Corporation filed Critical Union Camp Corporation
Priority to EP97926501A priority Critical patent/EP0906181A1/en
Publication of WO1997044178A1 publication Critical patent/WO1997044178A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/08—Copolymers of ethylene
    • B29K2023/083—EVA, i.e. ethylene vinyl acetate copolymer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene

Definitions

  • the present invention is directed to coextruded blown films of polyolefin having multiple layers which are particularly suited for forming packages for the storage of difficult to store materials
  • Plastics such as low, linear low, and high density polyethylene (LDPE LLDPE, and HDPE) are extruded through a circular die to form a film Air is introduced through the center of the die to maintain the film in the form of a bubble which increases
  • the number of extruders is dependent upon the number of different materials comprising the coextruded film For each different material a different extruder is used. Thus a five-layer coextrusion may require up to five extruders although less may be used if two or more of the layers are made of the same material
  • a melt enters a ring-shaped die either through the bottom or side thereof.
  • the melt is forced through spiral grooves around the surface of a mandrel inside the die and extruded through the die opening as a thick-walled tube.
  • the tube is expanded into a bubble of desired diameter and correspondingly decreased thickness as previously described.
  • Coextrusion dies are used to form coextruded blown films They have multiple mandrels that feed the different melt streams to the circular die lip Feedblocks are employed to stack melt layers from two or more extruders The multilayered melt stream is then fed to the film die
  • Coextruded blown films are commercially available for example, a coextruded blown film of ethylene vinyl acetate (EVA)/LLDPE/t ⁇ e resin/nylon/tie resin/LLDPE/EVA is produced by James River Corporation under the tradename Zeelon 590 A three layer coextruded blown film comprising metallocene (m) LLDPE(EVA)/t ⁇ e resin/nylon/tie resin/mLLDPE(EVA) is produced by United Films under the tradename Unilon 5238 A multilayer coextruded blown film comprised of HDPE/tie-resin/nylon/tie resin/LLDPE/mLLDPE is produced by United Film under the tradename Unilon 5890
  • the present invention is directed to a coextruded blown film having multiple layers in which at least one of the layers is a metallocene linear low density polyethylene and at least one other layer is an impact grade polypropylene
  • Pouches, bags and other containers made from this combination of materials provide excellent toughness and impact strength and furthermore provide an excellent barrier to grease and oil and light hydrocarbons such as turpentine and the like.
  • coextruded blown film of the present invention can be used as a packaging substrate alone, as a liner in multi-wall bags, or a strength/sealant ply in laminated structures such as with polyethylene terephthalate or biaxially oriented polypropylene BRIEF DESCRIPTION OF THE DRAWING
  • Figure 1 is a schematic view of a typical blown film extrusion apparatus
  • Figure 2 is a schematic view of a coextrusion die with multiple mandrels for use
  • FIG. 1 there is shown a known blown film extrusion device 2 comprised of a bubble forming section 4, a control section 6 and a thin film forming section 8.
  • the bubble forming section 4 includes an inlet 10 for receiving a suitable molten, plastic resin.
  • a pathway 14 is provided for the flow of the melted resin from the inlet to a narrow annular outlet 16 which forms the molten resin into a continuous bubble 18 when air is blown into the resin within the circumference of the annular outlet
  • the control section 6 controls the size of the bubble
  • the control section 6 is provided with sensors 20 which detect the diameter of the bubble 18 and transmit a
  • the film forming section 8 includes a frame 24 which draws the sides of the bubble 18 inwardly so that the sides collapse on one another to form a two layer film 26
  • the film is passed through nip rolls 28 which draws the two layers of film upward and sends the compressed film to a storage facility (not shown)
  • the extrusion device 2 is a typically provided with an external cooling section 29 in which air which is cooler than the air within the bubble is obtained from a source (not shown) and is transported via a conduit 30 around the circumference of the bubble 18 as it leaves the outlet 16
  • an internal cooling assembly 32 which includes a conduit 34 for receiving ambient or cooled air from a source (not shown) and transporting the same to a outlet 36 having an opening 37 within the bubble 18 Air
  • a coextrusion die is used to form a multilayer film shown as layers A, B and C in Figure 2
  • a coextrusion die shown generally by the numeral 40
  • Three mandreis 42, 44 and 46 are used to feed different melt streams to the die 40 It will be understood that while three
  • mandrels are shown more than three mandrels can be employed The die mandrels
  • a die opening 48 is provided which is a ring shaped gap between a die ring 50 and the mandrels (42, 44 and 46) The die opening 48 controls the
  • the materials comprising the coextruded blown film in accordance with the present invention include at least one layer of metallocene linear low density
  • Metallocene linear low density polyethylene is a material produced using the catalyst metallocene It has a narrow molecular weight distribution and
  • Impact grade polypropylene is polypropylene that typically has from about 8 to 15% by weight of ethylene.
  • An example of such material is PP7031 manufactured by Exxon Corporation and KSO89P manufactured by Montell Corporation
  • the modified polypropylene has a density from about 0.890 to 0 905 g/cm 3 , a melt flow rate of from about 0.5 to 2.0 g/10 min. and a tensile strength at yield of from about 3400 to 4100 psi.
  • mLLDPE in combination with impact grade polypropylene provides a coextruded blown film which has excellent characteristics for packaging of abrasive, corrosive and/or high grease, oil or fat content materials such as pet foods, herbicides, pesticides, oil modified seeds, animal bedding, lawn & garden products, rice, and commeal.
  • the impact grade polypropylene can vary over a wide range.
  • the mLLDPE is present in an amount of from about 25 to 75% by weight and the impact grade polypropylene in an amount of from about 25 to 67% by weight, based on the total weight of the coextruded blown film.
  • a preferred construction of the present invention comprises a layer of the impact grade polypropylene sandwiched between at least one and preferably two layers of the
  • the layers of the mLLDPE comprise 20 and 40% by weight, respectively of the total weight of the coextruded blown film while the impact grade polypropylene is present in an amount of from about 30 to 50% by weight
  • the thickness of the film can vary of a wide range, the film must be thick enough so that a leak proof seal can be formed It is preferred for most applications that the coextruded blown film have a thickness of from about 0 0015 to 0 006 inches, preferably from about 0 0030 to 0 0045 inches
  • coextruded blown films of the present invention can be formed into pouches bags, containers and the like using customary packaging machinery such as heat sealing devices using mandrels and the like
  • Film has been produced on 3-layer coextrusion system equipped with two extruders and an ABA coextrusion blown film die of the type shown in Figure 2
  • a film structure was produced which had a total thickness of 0 0046 inches and included the following 20% by weight Exxon 350 D60 mLLDPE, 50% by weight Exxon PP7031 polypropylene and 30% by weight 350 D60 mLLDPE
  • a 3.5" Sano extruder with a 30:1 UD (Length-to-Diameter ratio) barrier type screw was used to feed a mLLDPE to the outer "A" layers
  • An extruder temperature profile of 350-400-390-380-380F and a melt temperature at the die of 390F was used in processing the resin.
  • the temperature profile and melt temperature were 410-360-400-405-41 OF and 417F, respectively
  • Example 2 D 60 m LLDPE, 50% by weight of Montel KSO89P polypropylene and 25% by weight of Exxon 350 D 60 mLLDPE.
  • the film was processed in a manner similar to Example 1.
  • Example 2 The procedure of or similar to Example 1 was repeated except that the materials and amounts thereof used to form the film was as follows. 25% by weight of a blend of linear low density polyethylene (LLDPE) and low density polyethylene (LDPE) as the outside layer, 50% by weight of polypropylene as the middle layer and 25% by weight of mLLDPE as the inside layer.
  • LLDPE linear low density polyethylene
  • LDPE low density polyethylene
  • mLLDPE mLLDPE
  • Example 2 LLDPE and LDPE as the outside layer, 35% by weight of polypropylene as the middle layer, and 35% by weight of mLLDPE as the inside layer.
  • the film was processed in a manner similar to Example 1.

Abstract

A coextruded blown film (2) made from at least one layer of a metallocene linear low density polypropylene and at least one layer of an impact grade polypropylene and packaging devices made from coextruded blown film.

Description

COEXTRUDED BLOWN FILM AND PRODUCTS MADE USING THE SAME
TECHNICAL FIELD
The present invention is directed to coextruded blown films of polyolefin having multiple layers which are particularly suited for forming packages for the storage of difficult to store materials
BACKGROUND OF THE PRIOR ART
The technique of blown film extrusion is well known for the production of thin plastic films Plastics, such as low, linear low, and high density polyethylene (LDPE LLDPE, and HDPE) are extruded through a circular die to form a film Air is introduced through the center of the die to maintain the film in the form of a bubble which increases
the diameter of the film about 2 to 6 fold, after which the bubble is collapsed onto
rollers
The formation of coextruded blown films is also known in the art Coextrusion systems for making multilayer films employ at least two extruders feeding a common
die assembly The number of extruders is dependent upon the number of different materials comprising the coextruded film For each different material a different extruder is used. Thus a five-layer coextrusion may require up to five extruders although less may be used if two or more of the layers are made of the same material
In the formation of blown films, a melt enters a ring-shaped die either through the bottom or side thereof. The melt is forced through spiral grooves around the surface of a mandrel inside the die and extruded through the die opening as a thick-walled tube. The tube is expanded into a bubble of desired diameter and correspondingly decreased thickness as previously described.
Coextrusion dies are used to form coextruded blown films They have multiple mandrels that feed the different melt streams to the circular die lip Feedblocks are employed to stack melt layers from two or more extruders The multilayered melt stream is then fed to the film die
Coextruded blown films are commercially available For example, a coextruded blown film of ethylene vinyl acetate (EVA)/LLDPE/tιe resin/nylon/tie resin/LLDPE/EVA is produced by James River Corporation under the tradename Zeelon 590 A three layer coextruded blown film comprising metallocene (m) LLDPE(EVA)/tιe resin/nylon/tie resin/mLLDPE(EVA) is produced by United Films under the tradename Unilon 5238 A multilayer coextruded blown film comprised of HDPE/tie-resin/nylon/tie resin/LLDPE/mLLDPE is produced by United Film under the tradename Unilon 5890
Although such products possess acceptable toughness, sealability, impact and grease/oil barrier characteristics, they are expensive to produce typically ranging from $1 50 to $1 75 per pound
There is therefore a need in the packaging art to have packages formed from coextruded blown films which possess excellent grease resistance, impact resistance and toughness at less cost than such packages currently available
SUMMARY OF THE INVENTION
The present invention is directed to a coextruded blown film having multiple layers in which at least one of the layers is a metallocene linear low density polyethylene and at least one other layer is an impact grade polypropylene
Pouches, bags and other containers made from this combination of materials provide excellent toughness and impact strength and furthermore provide an excellent barrier to grease and oil and light hydrocarbons such as turpentine and the like The
coextruded blown film of the present invention can be used as a packaging substrate alone, as a liner in multi-wall bags, or a strength/sealant ply in laminated structures such as with polyethylene terephthalate or biaxially oriented polypropylene BRIEF DESCRIPTION OF THE DRAWING
The following drawings are illustrative of a blown film extrusion apparatus which may be employed to form the coextruded blown film of the present invention The embodiments shown in the drawing figures are not intended to limit the invention as encompassed by the claims forming part of the application
Figure 1 is a schematic view of a typical blown film extrusion apparatus, and
Figure 2 is a schematic view of a coextrusion die with multiple mandrels for use
in the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Referring to Figure 1 there is shown a known blown film extrusion device 2 comprised of a bubble forming section 4, a control section 6 and a thin film forming section 8.
The bubble forming section 4 includes an inlet 10 for receiving a suitable molten, plastic resin. A pathway 14 is provided for the flow of the melted resin from the inlet to a narrow annular outlet 16 which forms the molten resin into a continuous bubble 18 when air is blown into the resin within the circumference of the annular outlet The control section 6 controls the size of the bubble The control section 6 is provided with sensors 20 which detect the diameter of the bubble 18 and transmit a
detectable signal to a damper 21 which adjusts internal bubble pressure which determines the size of the bubble
The film forming section 8 includes a frame 24 which draws the sides of the bubble 18 inwardly so that the sides collapse on one another to form a two layer film 26 The film is passed through nip rolls 28 which draws the two layers of film upward and sends the compressed film to a storage facility (not shown)
The extrusion device 2 is a typically provided with an external cooling section 29 in which air which is cooler than the air within the bubble is obtained from a source (not shown) and is transported via a conduit 30 around the circumference of the bubble 18 as it leaves the outlet 16
There may also be provided an internal cooling assembly 32 which includes a conduit 34 for receiving ambient or cooled air from a source (not shown) and transporting the same to a outlet 36 having an opening 37 within the bubble 18 Air
from the bubble 18 is thereby forced into a return conduit 38 where it is transported through a conduit 39 and past the damper 21 In a coextrusion process, a coextrusion die is used to form a multilayer film shown as layers A, B and C in Figure 2 Referring to Figure 2 there is shown a coextrusion die shown generally by the numeral 40 Three mandreis 42, 44 and 46 are used to feed different melt streams to the die 40 It will be understood that while three
mandrels are shown more than three mandrels can be employed The die mandrels
(42, 44 and 46) can be adjusted to change the die opening and in turn control gauge/uniformity A die opening 48 is provided which is a ring shaped gap between a die ring 50 and the mandrels (42, 44 and 46) The die opening 48 controls the
thickness of the extruded tube
The materials comprising the coextruded blown film in accordance with the present invention include at least one layer of metallocene linear low density
polyethylene and at least one layer of an impact grade polypropylene
Metallocene linear low density polyethylene (mLLDPE) is a material produced using the catalyst metallocene It has a narrow molecular weight distribution and
excellent heat seal properties An example of such material is Exceed 350 D60 manufactured by Exxon Corporation Metallocene linear low density polyethylene provides a leak proof seal for difficult to store materials and seals at relatively low temperatures Impact grade polypropylene is polypropylene that typically has from about 8 to 15% by weight of ethylene. An example of such material is PP7031 manufactured by Exxon Corporation and KSO89P manufactured by Montell Corporation In particular the modified polypropylene has a density from about 0.890 to 0 905 g/cm3, a melt flow rate of from about 0.5 to 2.0 g/10 min. and a tensile strength at yield of from about 3400 to 4100 psi.
It has been discovered that mLLDPE in combination with impact grade polypropylene provides a coextruded blown film which has excellent characteristics for packaging of abrasive, corrosive and/or high grease, oil or fat content materials such as pet foods, herbicides, pesticides, oil modified seeds, animal bedding, lawn & garden products, rice, and commeal.
The relative amounts of the metallocene linear low density polyethylene and the
impact grade polypropylene can vary over a wide range. In a preferred form of the invention, the mLLDPE is present in an amount of from about 25 to 75% by weight and the impact grade polypropylene in an amount of from about 25 to 67% by weight, based on the total weight of the coextruded blown film.
A preferred construction of the present invention comprises a layer of the impact grade polypropylene sandwiched between at least one and preferably two layers of the
mLLDPE In a particularly preferred embodiment of the invention the layers of the mLLDPE comprise 20 and 40% by weight, respectively of the total weight of the coextruded blown film while the impact grade polypropylene is present in an amount of from about 30 to 50% by weight
While the thickness of the film can vary of a wide range, the film must be thick enough so that a leak proof seal can be formed It is preferred for most applications that the coextruded blown film have a thickness of from about 0 0015 to 0 006 inches, preferably from about 0 0030 to 0 0045 inches
The coextruded blown films of the present invention can be formed into pouches bags, containers and the like using customary packaging machinery such as heat sealing devices using mandrels and the like
EXAMPLE 1
Film has been produced on 3-layer coextrusion system equipped with two extruders and an ABA coextrusion blown film die of the type shown in Figure 2 A film structure was produced which had a total thickness of 0 0046 inches and included the following 20% by weight Exxon 350 D60 mLLDPE, 50% by weight Exxon PP7031 polypropylene and 30% by weight 350 D60 mLLDPE A 3.5" Sano extruder with a 30:1 UD (Length-to-Diameter ratio) barrier type screw was used to feed a mLLDPE to the outer "A" layers An extruder temperature profile of 350-400-390-380-380F and a melt temperature at the die of 390F was used in processing the resin.
A 2.5" Sterling extruder with a 30:1 IJD barrier type screw was used to feed the
PP copolymer resin to middle "B" layer of the coextruded film. The temperature profile and melt temperature were 410-360-400-405-41 OF and 417F, respectively
A 10" Sano ABA Coextrusion Die adjusted to provide a 20 50'30% by weight
distribution and a blowup ratio of 2 1 (film bubble diameter to die diameter) was employed in the run. To achieve the proper ratio of layers and total target thickness, the extruder rpm was adjusted for each film component as well as the film haul-off rate
A 100 pounds of each resin component were processed into film
Example 2
The procedure of or similar to Example 1 was repeated except that the materials and amounts thereof used to form the film were as follows 25% by weight of Exxon 350
D 60 m LLDPE, 50% by weight of Montel KSO89P polypropylene and 25% by weight of Exxon 350 D 60 mLLDPE. The film was processed in a manner similar to Example 1.
Example 3
The procedure of or similar to Example 1 was repeated except that the materials and amounts thereof used to form the film was as follows. 25% by weight of a blend of linear low density polyethylene (LLDPE) and low density polyethylene (LDPE) as the outside layer, 50% by weight of polypropylene as the middle layer and 25% by weight of mLLDPE as the inside layer. The film was processed in a manner similar to Example 1
Example 4
The procedure of or similar to Example 1 was repeated except that the materials
and amounts thereof used to form the film was as follows 25% by weight of a blend of
LLDPE and LDPE as the outside layer, 35% by weight of polypropylene as the middle layer, and 35% by weight of mLLDPE as the inside layer. The film was processed in a manner similar to Example 1.

Claims

WHAT IS CLAIMED IS
1 A coextruded blown film comprising at least one layer of a metallocene linear low density polyethylene and at least one layer of an impact grade polypropylene
2 The blown film of claim 1 comprising a layer of said polypropylene between layers of said metallocene linear low density polyethylene
3 The blown film of claim 1 comprising an inside layer, a middle layer and
an outside layer, at least one of the inside layer and the outside layer comprising said metallocene linear low density polyethylene
4 The blown film of claim 3 wherein the inside layer comprises metallocene
linear low density polyethylene
5 The blown film of claim 1 wherein the weight of said polypropylene is from about 25 to 67% by weight based on the total weight of the coextruded blown film
6 The blown film of claim 1 wherein the weight of said metallocene linear low density polyethylene is from about 25 to 75% by weight based on the total weight of the coextruded blown film
7 The blown film of claim 1 comprising from about 20 to 40% by weight of a first layer of metallocene linear low density polyethylene, from about 30 to about 50% by weight of said polypropylene and from about 20 to 40% by weight of a second layer of said metallocene linear low density polyethylene
8 The blown film of claim 1 wherein the thickness of the blown film is sufficient to enable a leak proof seal to be formed
9 The blown film of claim 8 having a thickness of from about 0 0015 to 0 006 inches
10 The blown film of claim 9 wherein the thickness of the blown film is from about 0 0030 to 0 0045 inches
1 1 A packaging device comprising a blown film, said blown film comprising at least one layer of a metallocene linear low density polyethylene and at least one layer of an impact grade polyethylene
12 The packaging device of claim 11 wherein the blown film comprises a layer of said polypropylene between layers of said metallocene linear low density
polyethylene
13. The packaging device of claim 11 wherein the blown film comprises an inside layer, a middle layer and an outside layer, at least one of the inside layer and outside layer comprising said metallocene linear low density polyethylene
14 The packaging device of claim 13 wherein the inside layer comprises metallocene linear low density polyethylene.
15. The packaging device of claim 11 wherein the thickness of the blown film is sufficient to form a leak proof seal
16. The packaging device of claim 15 wherein the thickness of the blown film is from about 0.0015 to 0.006 inches
17. The packaging device of claim 16 wherein the thickness of the blown film
is from about 0.0035 to 0.0045 inches
PCT/US1997/008177 1996-05-20 1997-05-14 Coextruded blown film and products made using the same WO1997044178A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97926501A EP0906181A1 (en) 1996-05-20 1997-05-14 Coextruded blown film and products made using the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1768196P 1996-05-20 1996-05-20
US60/017,681 1996-05-20

Publications (1)

Publication Number Publication Date
WO1997044178A1 true WO1997044178A1 (en) 1997-11-27

Family

ID=21783985

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/008177 WO1997044178A1 (en) 1996-05-20 1997-05-14 Coextruded blown film and products made using the same

Country Status (3)

Country Link
EP (1) EP0906181A1 (en)
CA (1) CA2253218A1 (en)
WO (1) WO1997044178A1 (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998037141A1 (en) * 1997-02-25 1998-08-27 Exxon Chemical Patents Inc. Heat sealable films
WO1998037142A1 (en) * 1997-02-25 1998-08-27 Exxon Chemical Patents Inc. Seals of polyethylene to a substrate
WO1998037140A1 (en) * 1997-02-25 1998-08-27 Exxon Chemical Patents Inc. Oriented coextruded films
GB2349846A (en) * 1999-05-14 2000-11-15 Glopak Inc High-speed pouch forming,sealing and filling machine,method of operation and multi-layer film therefor
US6291797B1 (en) 1996-08-13 2001-09-18 Nippon Sheet Glass Co., Ltd. Laser machining method for glass substrate, diffraction type optical device fabricated by the machining method, and method of manufacturing optical device
US6423420B1 (en) 1997-08-11 2002-07-23 Exxonmobil Chemical Patents Inc. Oriented coextruded films
US6503637B1 (en) 1997-02-25 2003-01-07 Exxon Mobil Chemical Patents Inc. Heat sealable films
FR2837471A1 (en) * 2002-03-25 2003-09-26 Flexico France Sarl Packaging film, especially useful for making plastic bags, comprises a polyethylene layer and a polypropylene layer containing low-density polyethylene
US6794053B2 (en) 1999-05-17 2004-09-21 Glopak Inc. Multi-layer film structure for use with a high-speed pouch forming, filling and sealing machine
EP1495861A1 (en) * 2003-07-10 2005-01-12 Total Petrochemicals Research Feluy High transparency, high impact resistance containers
WO2007047134A1 (en) * 2005-10-12 2007-04-26 Exxonmobil Oil Corporation Polymer films and methods of producing and using such films
US7217767B2 (en) 2004-07-06 2007-05-15 Fina Technology, Inc. Blends of polypropylene impact copolymer with other polymers
EP1831016A2 (en) * 2004-12-30 2007-09-12 Fina Technology, Inc. Co-extruded film structures of polypropylene impact copolymer with other polymers
EP2006070A1 (en) * 2007-06-22 2008-12-24 Total Petrochemicals Research Feluy Process for producing a polyethylene-polypropylene multilayer blown film
WO2009077622A2 (en) * 2007-12-19 2009-06-25 Total Petrochemicals Research Feluy Corona treated polyethylene films
US7915342B2 (en) 2005-11-28 2011-03-29 Fina Techology, Inc. Breathable films
EP2554374A1 (en) 2011-08-01 2013-02-06 The Procter & Gamble Company A multilayer film, packages comprising the multilayer film, and processes for making
US9084445B2 (en) 2011-09-15 2015-07-21 Inteplast Group, Ltd. Disposable gloves and glove material compositions
US9084444B2 (en) 2010-05-25 2015-07-21 Inteplast Group, Ltd. Disposable gloves and glove material compositions
US9131737B2 (en) 2011-09-15 2015-09-15 Inteplast Group, Ltd. Disposable gloves and glove material compositions including a coloring agent

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5372882A (en) * 1992-07-10 1994-12-13 Hoechst Aktiengesellschaft Biaxially oriented, multilayer polyolefin film of high shrinkage which can be heat-sealed at low temperatures

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5491019A (en) * 1994-03-28 1996-02-13 W. R. Grace & Co.-Conn. Oxygen-permeable multilayer film

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5372882A (en) * 1992-07-10 1994-12-13 Hoechst Aktiengesellschaft Biaxially oriented, multilayer polyolefin film of high shrinkage which can be heat-sealed at low temperatures

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6291797B1 (en) 1996-08-13 2001-09-18 Nippon Sheet Glass Co., Ltd. Laser machining method for glass substrate, diffraction type optical device fabricated by the machining method, and method of manufacturing optical device
US6094889A (en) * 1997-02-25 2000-08-01 Exxon Chemical Patents, Inc. Method of form and seal packaging
US6503637B1 (en) 1997-02-25 2003-01-07 Exxon Mobil Chemical Patents Inc. Heat sealable films
WO1998037141A1 (en) * 1997-02-25 1998-08-27 Exxon Chemical Patents Inc. Heat sealable films
EP1318173A1 (en) * 1997-02-25 2003-06-11 ExxonMobil Chemical Patents Inc. Oriented coextruded films
WO1998037140A1 (en) * 1997-02-25 1998-08-27 Exxon Chemical Patents Inc. Oriented coextruded films
WO1998037142A1 (en) * 1997-02-25 1998-08-27 Exxon Chemical Patents Inc. Seals of polyethylene to a substrate
US6423420B1 (en) 1997-08-11 2002-07-23 Exxonmobil Chemical Patents Inc. Oriented coextruded films
US6237308B1 (en) 1999-05-14 2001-05-29 Glopak Inc. High-speed pouch forming, sealing and filling machine, method of operation, and multi-layer film therefore
GB2349846A (en) * 1999-05-14 2000-11-15 Glopak Inc High-speed pouch forming,sealing and filling machine,method of operation and multi-layer film therefor
GB2349846B (en) * 1999-05-14 2003-07-30 Glopak Inc High-speed pouch forming, sealing and filling machine, method of operation, and multi-layer film therefor
US6794053B2 (en) 1999-05-17 2004-09-21 Glopak Inc. Multi-layer film structure for use with a high-speed pouch forming, filling and sealing machine
FR2837471A1 (en) * 2002-03-25 2003-09-26 Flexico France Sarl Packaging film, especially useful for making plastic bags, comprises a polyethylene layer and a polypropylene layer containing low-density polyethylene
EP1495861A1 (en) * 2003-07-10 2005-01-12 Total Petrochemicals Research Feluy High transparency, high impact resistance containers
US7217767B2 (en) 2004-07-06 2007-05-15 Fina Technology, Inc. Blends of polypropylene impact copolymer with other polymers
EP1831016A2 (en) * 2004-12-30 2007-09-12 Fina Technology, Inc. Co-extruded film structures of polypropylene impact copolymer with other polymers
EP1831016A4 (en) * 2004-12-30 2010-12-15 Fina Technology Co-extruded film structures of polypropylene impact copolymer with other polymers
WO2007047134A1 (en) * 2005-10-12 2007-04-26 Exxonmobil Oil Corporation Polymer films and methods of producing and using such films
US7915342B2 (en) 2005-11-28 2011-03-29 Fina Techology, Inc. Breathable films
EP2006070A1 (en) * 2007-06-22 2008-12-24 Total Petrochemicals Research Feluy Process for producing a polyethylene-polypropylene multilayer blown film
WO2009000783A1 (en) * 2007-06-22 2008-12-31 Total Petrochemicals Research Feluy Process for producing a polyethylene-polypropylene multilayer blown film
US8337743B2 (en) 2007-06-22 2012-12-25 Total Petrochemicals Research Feluy Process for producing a polyethylene-polypropylene multilayer blown film
KR101146543B1 (en) 2007-06-22 2012-07-11 토탈 페트로케미칼스 리서치 펠루이 Process for producing a polyethylene-polypropylene multilayer blown film
JP2010530323A (en) * 2007-06-22 2010-09-09 トータル・ペトロケミカルズ・リサーチ・フエリユイ Method for producing polyethylene-polypropylene multilayer blow molded film
EP2075125A1 (en) * 2007-12-19 2009-07-01 Total Petrochemicals Research Feluy Corona treated polyethylene films
WO2009077622A3 (en) * 2007-12-19 2010-06-24 Total Petrochemicals Research Feluy Corona treated polyethylene films
WO2009077622A2 (en) * 2007-12-19 2009-06-25 Total Petrochemicals Research Feluy Corona treated polyethylene films
US9084444B2 (en) 2010-05-25 2015-07-21 Inteplast Group, Ltd. Disposable gloves and glove material compositions
EP2554374A1 (en) 2011-08-01 2013-02-06 The Procter & Gamble Company A multilayer film, packages comprising the multilayer film, and processes for making
WO2013019848A1 (en) 2011-08-01 2013-02-07 The Procter & Gamble Company A multilayer film, packages comprising the multilayer film, and processes for making
US9084445B2 (en) 2011-09-15 2015-07-21 Inteplast Group, Ltd. Disposable gloves and glove material compositions
US9131737B2 (en) 2011-09-15 2015-09-15 Inteplast Group, Ltd. Disposable gloves and glove material compositions including a coloring agent
US9635892B2 (en) 2011-09-15 2017-05-02 Inteplast Group Corporation Disposable gloves and glove material compositions

Also Published As

Publication number Publication date
EP0906181A4 (en) 1999-04-07
EP0906181A1 (en) 1999-04-07
CA2253218A1 (en) 1997-11-27

Similar Documents

Publication Publication Date Title
EP0906181A1 (en) Coextruded blown film and products made using the same
US4151318A (en) Laminar thermoplastic film constructions
US4303710A (en) Coextruded multi-layer polyethylene film and bag construction
AU612699B2 (en) Biaxially oriented multiplayer barrier films and methods of making
US9481143B2 (en) Multilayer structures having annular profiles
US4390573A (en) Laminar thermoplastic film constructions
US4522775A (en) Apparatus and method for producing multilayered laminates
US4944972A (en) Coextrusion apparatus, methods, and related films and packages
CA2157213C (en) Laminated resilient flexible barrier membranes
US6218024B1 (en) Multilayer plastic film
US9233524B2 (en) Integrated process for making inflatable article
AU623355B2 (en) High strength coextruded film for chub packaging
EP2344332B1 (en) Multi layer film
US4357191A (en) Laminar thermoplastic film constructions
CN102350794B (en) Method for preparing polyolefin-based barrier material product
US6391411B1 (en) Machine direction oriented high molecular weight, high density polyethylene films with enhanced water vapor transmission properties
GB2028716A (en) Laminar thermoplastic film constructions
US5236642A (en) Multiple layer sheet materials, and packages, and methods and apparatus for making
US4281981A (en) Die assembly providing uniform pressure and flow
US6093462A (en) Low orientation thermoplastic sheet products and processes
US6413346B1 (en) Production of stretch plastic film
US4289727A (en) Method for extrusion of tubular films
US5705111A (en) Methods for making multiple layer sheet materials
CA2038800A1 (en) Ethylene propylene terpolymer film
CN100551787C (en) Multilayer polymer compound packaging material and job operation thereof with nano-layer texture

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA JP KR MX

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
ENP Entry into the national phase

Ref document number: 2253218

Country of ref document: CA

Ref country code: CA

Ref document number: 2253218

Kind code of ref document: A

Format of ref document f/p: F

WWE Wipo information: entry into national phase

Ref document number: 1997926501

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1997926501

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 97542514

Format of ref document f/p: F

WWP Wipo information: published in national office

Ref document number: 1997926501

Country of ref document: EP