US2981361A - Cabinet construction - Google Patents

Description

April 25, 1961 c. SCHOFIELD CABINET CONSTRUCTION Filed April 12, 1956 I N VEN TOR. 05cm LSCHOFIEL 0 A7 Ta /V15) United States Patent CABINET CONSTRUCTION Cecil Schofield, Lakewood, Ohio, assignor to Republic Steel Corporation, Cleveland, Ohio, a corporation of New Jersey Filed Apr. 12, 1956, S91. No. 577,684 15 Claims. Cl. 181-33) This invention relates to a sound-deadened cabinet structure and, more particularly, to a panel structure having a sound-deadening member structurally attached to said panels.

Panels for cabinets and particularly hollow panels for cabinet doors are preferably constructed so as to diminish and avoid objectionable noises including noises characterized as tinny. In metal doors for cabinet constructions, such as in kitchen equipment, the sounds that may emanate from a pair of panels are considered highly objectionable as indicative of cheap construction. In addition, the cooperating panels must be in a fixed relationship with respect to each other, so as to form a permanent structure.

One of the objects of this invention is to provide a new and improved monoplasmic adhesive,-sound-deadening composition.

It is an object of this invention to provide sound deadened construction including adhesive composition affixed to surfaces of the construction and holding them fixed with respect to each other and separated.

It is a further object of this invention to provide panels held together by an adhesive composition which adheres to the panels, deadens noises produced at the attached panels and provides structural reinforcement to the panel construction.

It is still another object of this invention to provide a sound-deadening means in a panel construction which has gas-containing voids and a well defined body.

It is a still further object of this invention to provide a construction of two panels fastened together and structurally reinforced by an adhesive composition which adheres to the panels and deadens noises.

Still another object of this invention is to provide means and method for attachment together of fixed panels of a panel construction with an adhesive mixture which develops voids during the procedure of attaching the adhesive to the panels.

A still further object of this invention is the provision of means and method of forming voids within an adhesive containing mixture to provide a final product having a well defined body and adhesiveness.

Still another object of this invention is to provide an adhesive-containing mixture for use in Securing structural parts containing gas voids and a surface skin, which retains its tooth after the formation of the voids and confines the voids in a cellular structure to provide an adhesive body with a well defined general configuration.

These and other objects of this invention will become more apparent upon consideration of the following description, taken together with the accompanying drawings, in which:

Figure 1 is a perspective view of a structural unit of this invention with a panel partly broken away to show adhesive sound-deadening strips in place;

Fig. 2 is an end view of panels before assembly;

Fig. 3 is an end view of the panels of Fig. 2 assembled;

Fig. 4 is an end view of the assembled panels of Fig. 3 with the adhesive sound-deadening material expanded;

Fig. 5 is an end view of panels before assembly show- ICC ing an alternate method of applying the sound-deadener;

Fig. 6 is an end view of the panels of Fig. 5 assembled; and

Fig. 7 is the assembled structure of Fig. 6 with the adhesive sound-deadening material expanded.

In one type of panel construction, it. is desirable to provide a sound-deadening means which can be secured within a pair of panels of this structure. This sounddeadening material contains an adhesive composition which adheres to the panel inner surfaces and retains its characteristics over a wide range of temperatures without melting, burning, embrittling or cracking. The adhesive composition must retain its adhesive qualities on oil and grease covered surfaces. It is also desirable to provide a sound-deadening material with means which expand the material to extend a small amount of the adhesive composition across a substantial space between adjacent panels and retain its shape.

An adhesive composition of this invention has a blend of reclaimed rubber base adhesive and asphalt base cent in a range of percentages of not less than 10% by weight of the rubber base adhesive and not more than 37% by weight of the rubber base adhesive. The adhesive may contain a blowing agent of biuret and urea, which is mixed in the adhesive composition and forms a gas upon heating to produce voids in the sound-deadening material. The purpose of the blowing agent, fortning in the voids, is the extension of the sound-deadening material to give greater use of any given amount of material. The blowing agent incorporated in the adhesive composition provides a mixture which on baking swells to provide a mass which retains its general configuration as it enlarges. Thus the sound-deadening material may be formed into strips or ribbons stuck to the sound deadened structure. The formed sound-deadened material either in the blown or unblown form may be interposed between and attached to cooperating panels simultaneously, deaden the emergence of the noise from the panel structure and at the same time secure the panels with relation to each other without other means of affixation.

With the adhesive composition of this invention and the blowing agent composed of biuret and urea, a structure is formed having a surface skin which develops after a few seconds of exposure. to ambient air. The skin remains intact during the swelling action produced by the .gasification of the blowing agent. The cells or voids formed by the gasification are confined within the surface skin. Thus, oxidation of the material is prevented during the procedure of heating the sound-deadening composition, and also the general shape of the sound-deadening material structure is maintained. The sound-deadening material is generally made up in the form of ribbons or strips and retains the preformed shape during the process of heating, adhering and swelling, so that the final product is a blown up version of the original structurel shape.

in Fig. 1 there is shown a panel construction of this invention made up of a panel 10 and a panel 11 assembled together and held in position by adhesive strips 12 made up of blown sound-deadening composition of this invention. The strips 12 are laid parallel between the panels ltl and 11, spaced at regular intervals. In Fig. 2 an end view of the panels 10 and 11 shows the strips 12 applied to panel 10 before assembly of the panels and blowing of the composition. The strips 12 are shown adhered to the panel 10. The panel 10 is interposed within the panel 11 upon assembly, as shown in Fig. 3. This interposition and assembly bring the strips 12 into close approach or actual contiguity with the panel 11.

In Fig. 4 the panel construction is shown with the strips 12 expanded by subjection to the heat. The strips deadening action of this invention.

. bled panels 10 and 11. secure the panels 10 and 11 together.

sive and deadening qualities set forth above.

12 are spread out laterally to occupy a greater volume and provide additional contiguity with panel surfaces. The expanded strips 12 provide the sound-deadening action, structural reinforcement and constructional fastening of this invention.

In Figs. 5, 6 and 7 an alternate method of applying the strips of composition is shown resulting in a modified panel construction. In Fig. an end view of the panels .10 and 11 shows strips 13 of the sound-deadening adhesive composition in the modified manner of application to the panels. The strips 13 are adhered to each of the panels 10 and 11. The strips 13 are positioned on each panel with respect to a corresponding strip 13 on the .other panel, so as to be diametric thereto. The panel 10 is interposed within the panel 11 upon assembly, as shown in Fig. 6. This interposition and assembly bring the diametric strips 13 into close apposition or actual contiguity. In Fig. 7 the strips 13 are shown after expansion by subjection to heat. The strips 13 are spread out laterally to occupy a greater volume and provide additional contiguity. Thus, the six strips coalesce into three strips of expanded adhesive material which adhere to the cooperating panels 10 and 11 and provide thesound- The final expanded strips 13 provide structural reinforcement to the assem- The final strips also serve to The adhesive, sound-deadening material is a blended composition of rubber adhesive and asphalt cement ,having an adhesiveness which meets high and low temperature requirements, and when positioned in structural faces deadens sound produced at the surface.

The rubber adhesive is made up of reclaimed rubber,

,a resin and a solvent. The asphalt cement is made up of a blended asphalt, a resin binder, a petroleum solvent and a filler. These combined components when blended into the sound-deadening composition provide the adhe- The inclusion of the blowing agent in the adhesive composition pro-. vides adhesive mixture, referred to above, which can be expanded on baking without loss of structural or sounddeadening characteristics. A range of proportions of .rubber adhesive, asphalt cement and blowing agent which 5 have been found suitable in the practice of this invention is disclosed in the table below, wherein are found .both a representative range of ingredients and a preferred percentage of components. The following table shows the components of the adhesive mixture in percent- The reclaimed rubber component refers to rubber reclaimed from automobile tires such as carcass or tube stock.

The resin component of the rubber adhesive may be selected from the group consisting of Cumar Rosin Glycerol ester of hydrogenated rosin Glycerol ester of a neutral glycol ester of rosin Pentaerythritol ester of rosin Pentaerythritol ester of hydrogenated rosin 4 The solvent component of the rubber adhesive may be selected from the group consisting of Rubber Solvent No. 8180, an aliphatic petroleum solventShell Oil Company Toluol Mixture of white gasoline, ethyl alcohol and methyl alcohol N-heptane The asphalt component of the asphalt base cement is an asphalt having the following properties- (ring and ball be selected from the group consisting of- Cumarone Phenol formaldehyde resin Ester Gum H, an organic alcohol ester of rosin-Archer- Daniels-Midland Company Arochem 345, a polymerized ester gum-Archer-Daniels- Midland Company together with plasticizers selected from the group consisting of- Santicize E-IS, ethyl phthalyl ethyl glycollate-Monsanto Chemical Company Triphenyl phosphate Dioctyl phthalate Butyl glycol phthalate Dimethylphthalate Diethyl phthalate The filler of the asphalt base cement may be bentonite, silica, asbestos or a similar compound.

The solvent component of the asphalt base cement may be selected from the group consisting of- Rubber Solvent No. 8180, an aliphatic petroleum solventShell Oil Company Hi-Flash Naphtha Xylol Toluol Solvesso 100, a slow drying highly aromatic petroleum solvent-Socony Vacuum Oil Company Acetone Ethyl alcohol The range of proportions of the general components of the rubber base adhesive and asphalt base cement which have been found suitable may be used in making up the adhesive composition. An example of preferred proportions of the general components is also set forth in the table. The proportions are in percentage by weight.

TABLE II Rubber Base Adhesive Asphalt Base Cement Range, Preferred, Range, Preferred, percent percent percent percent Reclaim rubber Resin For the purposes of illustration, the following is a table of the relative proportions by weight of specific ingredients making up preferred proportions each of the two adhesives and the blowing agent of the adhesive composition. The relative proportions of the respective components of adhesives and the agent are centage by weight.

expressed in per- TABLE III Percent Percent As a specific illustration of the proportions of ingre- 'dients of the preferred adhesive, sound-deadening composition containing approximately 21% rubber base adhesive, 75% asphalt base cement and 4% blowing agent, the following is given:

TABLE IV Percent Reclaim rubber, carcass stock 9.00 .Asphalt (as specified) 13.00 =Cumra resin 5.00 Cumarone resin 13.00 Asbestos 38.00 Toluene 18.00 iBiuret 2.52 Urea- 1.48

The biuret and urea blowing agent which may be incorporated in the sound-deadening material decomposed to produce tiny pockets or voids giving the material sounddeadening qualities equivalent to the material without blowing agent. The adhesive mixture with the blowing agent is heated in contact with the sound-deadening surface to expand and provide a member having a total volume several times that of the original strip containing the unblown biuret and urea.

The following examples of the employment of an adhesive compositon in sound-deadening a panel construction are by way of illustration and not limitative on the scope of the invention. 7

Example 1 One pound of a mixture of 21% by weight of reclaimed rubber base adhesive and 75% by weight of asphalt base cement are mixed with 4% by weight of biuret and urea blowing agent. The composition mixture is applied in six strips, each 6. inch wide, on the inner surface of a door panel. The panels are assembled to diametrically position the composition strips and to provide a cabinet door 16" x 17" x As in dimension. The panel is heated to approximately 350 F. to cause expansion of the mixture by the blowing agent and to expand each pair of opposed strips into one structural piece. On cooling, after baking, the panels become structurally interconnected by the adhesive composition and are assembled into a cabinet construction.

Example II A mixture of 37% by weight of reclaimed rubber base adhesive and 63% by weight of asphalt base cement are mixed in a volume of one pint to which'is added 5% by weight of biuret and urea blowing agent. The composition mixture is applied in strips /2. inch wide to the inner surface of door panels for a cabinet door 16" x 17" x The panels are assembled to diametrically position the respective strips of composition. The assembled panels are heated to 350 F. to produce expansion by the gasification of the blowing agent and cause the diametrical strips to join as well as adhere to the respective panels. On cooling, the panels become fixed with respect to each other and the panel structure is assembled into a cabinet construction.

Example III A mixture of 22% by weight of reclaimed rubber base adhesive and 78% by weight of asphalt base cement are mixed in a volume of one pint to which is added 10% by weight of biuret and urea blowing agent. The mixture is applied to the inner surface of a door panel in two strips /2 wide and in height. The assembly of the strips and the door panel are heated to 350 F. to cause decomposition of the biuret and urea blowing agent. The decomposition of the blowing agent causes expansion of the mixture forming a structural sound-deadening element adhered to the inner surface of the panel. The resultant structure has very good sound-deadening properties.

Example IV A mixture of 37% by weight of reclaimed rubber base adhesive and 63% by weight of asphalt base cement are mixed in a volume of one pint to which is added 5% by weight of biuret and urea blowing agent and 25% by weight of fine sea sand. The mixture is applied in two strips /2 wide and A3" in height on the inside of a door panel. The asesmbly of the strips and door panel are heated to 350 F. to cause decomposition of the blowing agent and an expansion of the mixture. The resultant structure has very good sound-deadening properties.

Example V A mixture of 22% by weight of reclaimed rubber adhesive and 78% by weight of asphalt base cement are mixed in a volume of one pint to which is added 5% by weight of biuret and urea blowing agent. The mixture is sealed in a can and placed in an oven for a period of a week and held at an oven temperature of 200 F. The can is cooled and a portion of the adhesive mixture is applied to a door panel section. The assembly of mixture and the door panel are baked in the oven at 350 F. for 20 minutes. The blowing agent in the adhesive is decomposed to blow up the adhesive mixture. The resultant expansion of the adhesive is approximately the same as the expansion on heating adhesive mixture which has not been preheated to 200 F.

The biuret and urea blowing agent allows the adhesive mixture to be stored at 200 F. There is some blow of the blowing agent at 275 F.; however, effective blowing temperatures are 300 F. and above.

The blowing agent of biuret and urea in intimate mixture in the relative proportions indicated above is found most satisfactory. Either component without the other would not yield Wholly satisfactory results. Other blowing agents may be substituted for the preferred composition with modified results. Substitute compositions having a blowing action include mixtures of ammonium and sodium bicarbonates, nitrates and acetates, and organic compounds which are heat decomposable to form bubbles in a rubber mixture, such as diazo-amino-benzene.

It has been established that the optimum or minimum amount of the adhesive composition for three square feet of a panel construction is approximately eight ounces. Typical dimensions of a panel construction are indicated in the figures. A variation in door sizes and sounddeadening characteristics is contemplated in the application of this invention. The quantity of adhesive composition, per square area of panel construction, varies in accordance with these variations in demand.

The adhesive composition containing the blowing agent of this invention assumes a shape of a structural member as the result of the skin which forms during the blowing-up step. The skin which forms within a few seconds of exposure of the adhesive mixture to atmospheric air -ous ingredients and percentages of the ingredients.

'7 remains in contact during the swelling action that takes place on baking of the mixture and decomposition of the blowing agent. The skin is tenacious and impervious and retains the sticky adhesive properties of the adhesive composition. Thus, the adhesive material retains its shape despite the internal physical reformation that occurs as a result of the gasification. This expansion, as a result of the gasification, and the retention of a structural shape can be likened to the rising of bread dough on the baking of a loaf. The material, retaining its general configuration, expands in size to a controlled degree.

The sound-deadening material may be mounted between cooperating panels in a variety of forms. It has been found that relatively wide strips of the composition material provide the best sound-deadening structure. However, other shapes of the sound-deadening material between the panels provide a solid quality to the cooperating panels on incorporation in a cabinet construction. For good sound-deadening results, the composition material should be applied to door panels in strips of approximately /2" in width and not more than 3" apart.

The adhesive composition is incorporated in the panel construction preferably by application of strips to one of the cooperating panels with subsequent panel assembly and expansion of the composition bringing the strips into contact with the other panel. This preferred embodiment of the invention is illustrated in Figs. 1, 2, 3 and 4.

Other forms of the incorporation of the adhesive composition are feasible and within this invention. One such modification is shown in Figs. 5 6 and 7 with the strips of material applied to each inner face of the panel in opposing relation and may result in the strips expanding to form a single unified piece. The expansion is established as sufficient to cause strips of adhesives diametrically positioned on cooperating panels to come together and join, thus forming a single member bridging the space between the panels and causing them to be fastened together. The surface skin retains the gas pockets within the panel spacing sound-deadening material. The resultant product is a multi-cellular member attached to the inner surfaces of two cooperating panels with the member serving to assist in holding these panels together against relative movement.

'Other forms have also been found possible within the scope of this invention. For example, a typical adhesive composition mixture may be incorporated in a panel door construction in the shape of circular doughnuts having open centers (not shown). The adhesive composition may also be made up in the form of patties (not shown), which when incorporated and baked in a panel construction, provide sound-deadening properties. The adhesion of this form of incorporation is fair. The modified forms of incorporation are formed of adhesive compositions within the range of percentages of composition set forth in the above tables.

The physical properties of the adhesive composition may be varied to accommodate the variations of the form of the adhesive composition by changing the vari- The percentage composition of the invention in a particular embodiment is, therefore, in part determined by the form of the composition in the embodiment.

The strips between the cooperating panels deaden the sounds created by and at the panels and thus cause doors and other structural elements containing panels to have the gas pockets from gasification are preferred to strips containing solid material.

As pointed out in connection with the figures, theadhesive composition may act to fasten the component panels together without any other fastening. The adhesive composition formed in the panel construction thus may serve to eliminate the spot welding, as well as deaden sounds emanating from the panels. It is also conceived that the adhesive composition may be modified to provide structural reinforcement to the panel construction, as indicated above. The structural reinforcement may be enhanced by the modification of the adhesive composition without diminishing the other properties of this invention. It thus will be seen that the described embodiments of this invention illustrate the subject matter invented. These embodiments, however, may be modified without departure from the spirit of the invention. A modification of the adhesive composition, its form of incorporation and the panel construction, may be made to provide for structural reinforcement of the panel construction by the adhesive composition forms. The properties of the composition may be modified within this invention by the addition of such constituents as tackifiers, anti-oxidants, plasticizers, extenders and other agents commonly incorporated in rubber and asphaltic base adhesives and not incompatible with the composition of this invention. The overall properties of the sound-deadening material may also be altered by using different resins, fillers and solvents which will enhance the reinforcing properties of the material without objectionably detracting from its adhesive and sound-deadening properties.

This invention is especially advantageous in the manufacture of kitchen cabinet equipment. The doors of such structural units having a pair of cooperating panels when opened and closed tend to emit a high pitched and characteristic tinny sound. This is an objectionable feature as the emission of this type of sound is commonly associated with poorly constructed objects. A dull, thudlike sound, emitted by the slamming of a cabinet door, is popularly associated with better and sturdier constructed pieces. It is, therefore, desirable to dampen the high pitched, thin, tinny sound and to provide an object with the power of producing a deeper sound.

The adhesive characteristics of the composition of this invention are readily appreciated when it is realized that the composition will adhere to surfaces covered by light oil films. This advantage is two-fold in first eliminating the need of thorough and complete pro-cleaning of an adhered to surface and second, overcoming inadvertent inclusions of oil and other adherence-hampering conditions on the adhered to surfaces.

The adhesive of this invention has a wide range of performance. As pointed out above, it maintains its adhesive characteristics at temperatures of over 300 F. for substantial periods of time and at temperatures as low as 10 F. for up to 16 hours or more. The adhesive is flexible and is capable of a elbow bend without fracturing and is free of water which might cause rusting of metal surfaces to which it is applied. The advantages of the skin-forming characteristics of the combination of the adhesive composition with the blowing agent are pointed out above. In addition, this blowing agent produces gaseous ammonia and no water vapor.

The structural securing together of cooperating panels by means of the adhesive composition eliminates the spot welding operation in the panel construction and is consequently economical. Further advantages of this invention include simplicity in assembly and in the provision of a monoplasmic sound-deadening member. Monoplasmic is applied to the adhesive composition in the sense that the substance is composed totally of one common composition. The inclusion of a blowing agent in the sound-deadening composition provides the economy which allows the use of the monoplasmic type of sounddeadening strip. 7

As mentioned above, the various embodiments in this 9 description are set forth by way of illustration of the invention and to explain the mode of operation or principle. It will be understood that modifications may be made without departure from the spirit of the invention. It will be understood, therefore, that the invention is limited only by the scope of the appended claims.

What is claimed is:

1. A sound-deadening adhesive composition comprising an asphalt base cement in a proportion of at least 60% by weight and a reclaimed rubber base adhesive mixed therewith which iscapable of forming a structurally coherent member, said reclaimed rubber base adhesive constituting from 19% to 37% by weight of said composition and consisting of reclaimed rubber in the range of about 35% to 50% by weight, a. resin se ected from the group consisting of cumar, rosin, glycerol esters of rosin and pentaerythritol esters of hydrogenated rosin in the range of about 12% to 35% by weight and a solvent selected from the group consisting of aliphatic petroleum solvents, toluol, ethyl alcohol, and methyl alcohol in the range of about 30% to 38% by weight.

2. A sound-deadening adhesive composition comprising an asphalt base cement and a reclaimed rubber base adhesive mixed therewith which is capable of forming a structurally coherent member, said asphalt base cement constituting 63% to 81% by weight of said composition and consisting of asphalt in the range of about 15% to 20% by weight, a resin selected from the group consisting of cumarone, phenol formaldehyde resin, organic alcohol esters of rosin and polymerized ester gums in the range of about 15% to 20% by weight, a filler in the range of about 40% to 60% by weight and a solvent selected from the group consisting of petroleum solvents, acetone and ethyl alcohol in the range of about to 20% by weight.

3. A sound-deadening panel construction, comprising a panel sheet contiguous with a cavity, a sound-deadening adhesive member adhered to said panel sheet and occupying less than the entire volume of said cavity, said member comprising a rubber base adhesive and an asphalt base cement in a proportion of at least 60% by Weight, said rubber base adhesive consisting of a reclaimed rubber in the range of about 35% to 50% by weight, a resin in the range of about 12% to 35% by weight and a solvent in the range of about 30% to 38% by'weight.

4. A sound-deadening panel construction, comprising a panel sheet contiguous with a cavity, a sound-deadening adhesive member adhered to said panel sheet and occupying less than the entire volume of said cavity, said member comprising a rubber base adhesive and an asphalt base cement in a proportion of at least 60% by weight, and said asphalt base cement consisting of asphalt in the range of about to by weight, a resin in the range of about 15 to 20% by weight, a filler in the range of about 40% to 60% by weight and a solvent in the range of about 10% to 20% by weight.

5. A sound-deadening panel structure, as claimed in claim 3, including a decomposed blowing agent in said adhesive member.

6. A sound-deadening panel structure, as claimed in claim 4, including a decomposed blowing agent in said adhesive member.

7. A long, thin monoplasmic adhesive sound-deadening member comprising an adhesive composition consisting of reclaim rubber in the range of 7.35% to 10% by weight, asphalt in the range of 11.25% to 15.00% by weight, cumar resin in the range of 4.20% to 7.35% by weight, cumarone resin in the range of 11.25% to 15.00% by weight, asbestos in the range of 30.00% to 45.00% by weight, a solvent selected from the group consisting of aliphatic petroleum solvents, aromatic petroleum solvents, methyl alcohol and ethyl alcohol in the range of 13.80% to 22.98%, biuret in the range of 1.46% to 2.52% and urea in the range of 0.86% to 10 1.48% and having a relatively tenacious, impervious, sticky outer skin enclosing said adhesive composition to form said member.

8. A sound-deadening adhesive composition compris ing an asphalt base cement in a proportion of between 63% and 81% by weight and a reclaimed rubber base adhesive in a proportion of between 19% and 37% by weight mixed therewith which is capable of forming a structurally coherent member, said reclaimed rubber base adhesive consisting of reclaimed rubber in the range of about 35% to 50% by weight, a, resin selected from the group consisting of cumar, rosin, glycerol esters of rosin and pentaerythritol esters of hydrogenated rosin in the range of about 12% to 35% by weight and a solvent selected from the group consisting of aliphatic petroleum solvents, toluol, ethyl alcohol and methyl alcohol in the range of about 30% to 38% by weight, and said asphalt base cement consisting of asphalt in a range of about 15% to 20% by weight, a resin selected from the group consisting of cumarone, phenol formaldehyde resin, organic alcohol esters of resin and polymerized ester gums in the range of about 10% to 20% by weight, a filler in the range of about 40% to 60% by weight and a solvent selected from the group consisting of petroleum solvents, acetone and ethyl alcohol in the range of about 15% to 20% by weight.

9. The composition of claim 8, including a blowing agent which produces a gaseous reaction product upon heating and being capable of forming a structurally coherent member when the blowing agent is decomposed.

10. A monoplasmic adhesive sound-deadening member comprising an adhesive composition in an erect structural shape composed of a reclaimed rubber base adhesive and an asphalt base cement in a proportion of at least 60% by weight, said rubber base adhesive constituting 19% to 37% by weight of said composition and consisting of reclaimed rubber in the range of about 35 to 50% by weight, a resin selected from the group consisting of cumar, rosin, glycerol esters of rosin and pentaerythritol esters of hydrogenated rosin in the range of about 12% to 35 by weight and a solvent selected from the group consisting of aliphatic petroleum solvents, toluol, ethyl alcohol and methyl alcohol in the range of about 30% to 38% by weight.

11. A monoplasmic adhesive sound-deadening member comprising an adhesive composition in an erect structural shape composed of a reclaimed rubber base adhesive and an asphalt base cement, said asphalt base cement constituting 63% to 81% by weight of said composition and consisting of asphalt in the range of about 15% to 20% by weight, a resin selected from the group consisting of cumarone, phenol formaldehyde resin, organic alcohol esters of rosin and polymerized ester gums in the range of about 10% to 20% by weight, a filler in the range of about 40% to 60% by weight and a solvent selected from the group consisting of petroleum solvents, acetone and ethyl alcohol in the range of about 15 to 20% by weight.

12. A panel construction as defined in claim 3, which comprises a second panel sheet parallel with the first and proximate thereto at the other side of the cavity, each of said sheets being a metal panel, said adhesive member being internally cellular and being adherently engaged with both of the panel sheets at the mutually facing surfaces of said sheets.

13. A panel construction as defined in claim 4, which comprises a second panel sheet parallel with the first and proximate thereto at the other side of the cavity, each of said sheets being a metal panel, said adhesive member being internally cellular and being adherently engaged with both of the panel sheets at the mutually facing surfaces of said sheets.

14. A metal-surfaced, sound-deadened, composite panel construction, comprising a pair of proximately spaced, substantially parallel metal panels arranged to 11 form a cavity between their opposed inner faces, and at least one sound-deadening adhesive mass engaging the mutually facing metallic surfaces of said panels within the cavity and holding said panels in fixed relation to each other, said mass occupying less than all of the volume of said cavity and said cavity having void space at other localities between the panels, said mass having its lateral dimensions, both lengthwise and crosswise parallel to the panels, at least as great as the distance between the panels, and said mass consisting of a monoplasmic, internally cellular body, expanded laterally in place between the panels, which adherently engages the metal panel surfaces and which consists of a mixture of a rubber base adhesive and an asphalt base cement with a decomposed blowing agent therein, said cellular struc- 15 ture of the mass being formed by the blowing agent.

5 with the metal panel surfaces.

References Cited in the file of this patent UNITED STATES PATENTS 10 2,265,770 Crawford Dec. 9, 1941 2,323,336 Knorr July 6, 1943 2,445,290 Gonda July 13, 1948 2,578,001 Cubberley et al Dec. 11, 1951 2,707,707 Schwarz May 3, 1955 2,744,042 Pace May 1, 1956 2,768,091 Cubberley Oct. 23, 1956

Images