Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
  • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
  • D06P5/003—Transfer printing
  • D06P5/004—Transfer printing using subliming dyes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
  • B41M3/12—Transfer pictures or the like, e.g. decalcomanias
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
  • B41M5/035—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
  • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
  • D06P5/12—Reserving parts of the material before dyeing or printing ; Locally decreasing dye affinity by chemical means

Definitions

• Transfer printing in particular dry transfer printing, has gained considerable importance and is still growing.
• a sublimable dye e.g. a disperse dye or a deprotonated cationic dye
• an intermediate support preferably paper
• the transfer generally takes place at temperatures of approximately 150 to 220 ° C. for 10-120 seconds, it being advantageous to work under reduced pressure.
• structures made of synthetic fibers such as polyester, polyamide, polyacrylonitrile and also cellulose acetate fibers are suitable as substrates.
• the transfer printing can also take place on mixtures of the fibers mentioned with one another and their mixtures with wool or cellulose fibers. Transfer printing on cotton is also possible. However, the latter must first be prepared in such a way that affinity for the transferred dyes is generated. This also applies to mixtures of synthetic fibers with cellulose fibers if homogeneous staining is to be achieved. Suitable preparations are e.g. described in DE-PS 25 51 410 and in DE-AS 24 36 783.
• a particular advantage of transfer printing is that even very fine patterns and halftones can be produced in direct printing on the transfer carrier, while such patterns in conventional textile printing either not at all or only by means of reserve, etching or etching reserve printing processes are accessible.
• the invention thus relates to a process for producing reserve printing effects by the transfer printing process, which is characterized in that heavy metal salts are reacted on the transfer printing medium with transferable dyes which react with these heavy metal salts to form compounds which are not or difficult to sublimate under transfer printing conditions.
• polyester textiles with disperse dyes which contain at least two residues each with an unbound pair of electrons in the molecule and which are able to form metal chelate compounds to produce reserve effects by using a reserve printing paste as a protective agent.
• a reserve printing paste which contains copper salts and uses a pH of about 5 or higher.
• the process according to the invention is not limited to copper salts and also not to disperse dyes which form metal chelates.
• Preferred heavy metal salts contain chromium (III) ions and copper (II) ions.
• copper (II) ions the pH value of the reservation printing pastes 6 should not be lower.
• the heavy metal salts are preferred as chlorides, sulfates, but especially as formates or acetates used and in particular as ammonia or amine complexes which are derived from lower alkylamines or lower hydroxyalkylamines, for example the triethanolamine.
• Suitable dyes for the process according to the invention are all dyes which are customarily used in transfer printing and which react with heavy metal salts to form compounds which no longer or practically no longer sublimate under the transfer printing conditions. These dyes usually contain hydroxyl groups, nitrogen functions, thio groups, groups which can be converted into such compounds, for example by hydrolysis or tautomerism, or a combination of such functions.
• the invention furthermore relates to transfer printing supports, in particular transfer printing papers, which have a coating of transferable dyes which have been locally reacted with heavy metal salts to form compounds which cannot or cannot be sublimated under transfer printing conditions.
• white reserves can be generated if printing pastes containing heavy metal salts are printed on supports which have been pre-colored with dyes of the type described (printing reserve or excess pressure reserve) and, after the supports have dried, the transfer operation is carried out onto the substrate.
• pre-print reserve pre-print reserve
• a sublimable dye capable of reacting with the salt can be carried out wet-on-wet or with intermediate drying. The best results, this also applies to the possible uses of the invention described below, are in general received with overpressure reserves.
• the present invention is also very well suited for producing so-called halftone effects.
• the procedure is such that the heavy metal salt is metered in such a way that it is in deficit at the desired locations compared to the dye to be reserved, so that only a partial reservation takes place.
• the pre-dyeing or over-dyeing to be reserved contains compounds which react more with the metal salt, for example form complexes, than with the dye to be reserved. Examples of such compounds are strong complexing agents such as the trisodium salt of nitrilotriacetic acid or the tetra sodium salt of ethylenediaminetetraacetic acid.
• Color reserve effects are achieved by adding, for example, sublimable dyes to the heavy metal salt preparations, which are not capable of reacting with the heavy metal salts.
• sublimable dyes are added to the reservation pastes which are capable of reacting with the heavy metal salts.
• This works particularly well using the overpressure reserve method.
• This fact can be due to the fact that the reaction with the salt, for example a complex formation in the heat, in the present case thus takes place during the drying process after printing.
• the metal salt solution present in the printed reservation paste penetrates to the paper surface and thus preferably reacts with the pre-colored dye below.
• a mechanical reservation through the resulting implementation products is also conceivable.
• the intermediate carrier is pre-colored with a preparation which contains a mixture of dyes, some of which can react with the heavy metal salts, some not.
• a reservation paste containing heavy metal salt is applied in excess pressure.
• the color tone as it must result from the non-reactive components, develops in the vicinity of the overprinting points, as it corresponds to the pre-colored overall mixture.
• Machine-smooth sodium kraft paper weighing 70 g / cm 2 on one side is coated with a preparation of the following composition by means of a doctor blade on the smooth side:
• aqueous dispersion of the dye of the formula are stirred into 500 g of a 10% solution of a low-viscosity sodium alginate and made up to 1000 g of a spreadable paste with the same thickening or water.
• the copper salt solution has the following composition:
• copper (II) acetate instead of copper (II) acetate, copper (II) formate, chloride, sulfate and other copper salts can also be used.
• the result is a brilliant red print with sharp, reserved white areas where the copper salt paste was printed on the paper.
• the transfer printing is carried out for 30 seconds at 200 ° C. on a fabric made of polyacrylonitrile.
• a brilliant blue print is obtained with sharply outlined white areas where the copper salt paste has been applied to the paper.
• Example 1 One of the copper salt pastes listed in Example 1 is pre-printed on the smooth surface of a machine-smooth sodium kraft paper on one side and without intermediate drying by means of a doctor blade covered with a preparation as described in Example 1, but the 150 g of a commercially available, about 20% aqueous dispersion of the dye of the formula contains ..
• the paper is then dried.
• Machine-smooth sodium kraft paper (70 g / m 2 weight) is coated on one side with a preparation by means of a doctor blade on the smooth side, as described in Example 1, but with the dye mentioned there 80 g / kg of an approximately 35% aqueous dispersion of the dye of the formula is replaced.
• the mixture is then overprinted with 150 g of the copper salt paste described in Example 1, it being possible for the print to be carried out wet-on-wet or else after intermediate drying.
• Example 1 A paper as described in Example 1 is splashed by means of a 1000-point roller with the preparation likewise described in Example 1, but this is 80 g of an approximately 40% commercially available aqueous dispersion of the dye of the formula contains.
• Example 2 It is then overprinted in places with 200 g of a copper salt paste as described in Example 1. After the paper has dried, it is transferred to a cotton fabric or a fabric consisting of a mixture of 65% polyester with 35% cotton for 40 seconds at 210 ° C., the substrates mentioned being described in DE-PS 25 51 410, example 3 , were pretreated by padding on a foulard (liquor absorption 85%) and then drying.
• Example 2 The procedure is as described in Example 1, but the copper salt paste to be printed contains a quantity of the copper salt solution likewise described in Example 1 which is reduced to 40 g / kg.
• One-sided machine-smooth sodium kraft paper of 70 g / m 2 weight is colored using an open film printing stencil of 120 mesh with a preparation as described in Example 1, but 80 g of an approximately 35% aqueous dispersion of the dye of the formula contains.
• the copper salt paste mentioned under Example 1 is overprinted, which can be done without or with intermediate drying.
• the chromium salt solution used has the following composition:

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Coloring (AREA)

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Publications (1)

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Family Applications (1)

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Citations (6)

• 1979
  • 1979-07-25 DE DE19792930163 patent/DE2930163A1/de not_active Withdrawn
• 1980
  • 1980-07-21 EP EP80104278A patent/EP0023659A1/fr not_active Withdrawn

Patent Citations (6)

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