JPH0772234B2 - Foam forming composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a foam-forming composition obtained by a special polymerization method, and further, to stably form a durable high-strength foam. A modified foam-forming composition that can be.

[Conventional technology and its problems] Conventionally, a foaming agent, a coagulant, an aqueous dispersion of a natural or synthetic resin,
Crosslinking agent and other additives are added to mechanically foam, and this is coated on a substrate or poured into a mold and dried.
A method of forming a foam by solidifying and curing is known. Such natural and synthetic resin aqueous dispersions include natural rubber latex, styrene-butadiene copolymer aqueous dispersions, and acrylic ester copolymer aqueous dispersions. The formed foam is used in various applications because of its structural advantages such as light weight, wall thickness, feel, and feel.

However, many of these foams are inferior in performance such as mechanical strength and durability, and it is necessary to improve the strength and durability in order to use them in a wider range of applications. For example, in the case of natural rubber or butadiene-based copolymer, the improvement of mechanical strength such as light resistance and heat resistance, and in the case of acrylate copolymer, the improvement of mechanical strength, solvent resistance, cold resistance or elasticity, etc. is necessary.

On the other hand, various methods of forming a foam from an aqueous polyurethane dispersion have been proposed, and this foam is drawing attention as one having high performance in which the above-mentioned drawbacks are improved.
However, the polyurethane aqueous dispersion is not satisfactory in terms of foam moldability by the conventionally proposed mechanical foaming method, and it has not been expanded to a wide range of applications by utilizing the original characteristics of the resin, and improvement is necessary. . For example, it is unsatisfactory in terms of stable and wide foaming moldability capable of freely forming a foam having a high expansion ratio and a high coating thickness, and an improvement is required.

In this way, when forming a foam from the synthetic resin aqueous dispersion,
Although it has been strongly demanded to combine the foam physical properties such as high strength and high durability with the foam moldability capable of freely molding into a stable and industrially useful form, it has not been realized. Such important and difficult technical matters in the prior art are summarized in the foam moldability, the strength of the resin film, and the balance between them. That is, during the foaming of the water dispersion liquid, fine and uniform generation of bubbles and maintaining this, and the formation of the partition containing the bubbles is essentially strengthless water dispersion liquid that is a combination of bubbles from the water dispersion or The purpose is to form a resin film that is strong enough to withstand permanent air bubble retention without causing disappearance.

For this reason, various improvements have been made by, for example, blending a styrene-butadiene system and a urethane dispersion. For example, JP-A-60-197745 discloses that a random nonionic activator of ethylene oxide and propylene oxide is added to a blend. In addition, JP-A-62
JP-A-174114 discloses that the addition of a phosphate-based compound to the blend is effective. JP-A-62-177043 discloses that an alkyl mercaptan is added during the polymerization and the resulting butadiene-based water dispersion is blended with a urethane water dispersion. It is considered that the above means is superior to the conventional techniques in foaming moldability and dispersion stability, and that the strength of the resin film is improved to some extent.

However, there are cases where the above-mentioned improved method is not sufficient for expanding to various uses. That is, under some conditions, foam moldability and dispersion stability are insufficient. For example, foam moldability is not sufficient at low temperatures, and dispersion stability is not sufficient at high temperatures. In addition, the enhancement effect of the resin film was not always sufficient.

The present invention is to improve the foam moldability and dispersion stability under such severe conditions, and further improve the resin film strength, that is, the foam strength, beyond the limit of improvement by mere blending and addition aids. For the purpose of the above, it is intended to provide an improved foam molding composition which can be applied to various and various uses in which the required properties are highly sophisticated and diversified.

[Means for Solving Problems] The present inventors have found that foam physical properties that are remarkably improved in strength, durability and the like, and foam moldability that allows stable molding at low temperatures and free molding into industrially useful forms. As a result of diligent research on the moldability of foams from synthetic resin aqueous dispersions, a polymer aqueous dispersion obtained by (co) polymerizing unsaturated monomers in an aqueous medium in the presence of a self-dispersing polymer. The inventors have found that the use of a liquid can impart excellent foam physical properties and excellent foam moldability to the present invention.

That is, the present invention comprises a polymer aqueous dispersion obtained by polymerizing a conjugated diene and / or an ethylenically unsaturated monomer in an aqueous medium containing a self-dispersing polymer, thereby forming a foam. A composition for use is provided.

As the self-dispersing polymer, polyurethane, polyester and epoxy resin are preferable, and these are used alone or as a mixture. As the conjugated diene and / or ethylenically unsaturated monomer, butadiene and a mixture of ethylenically unsaturated monomers copolymerizable with butadiene are preferable.

Examples of the conjugated diene used in the present invention include butadiene-1,3,2-methyl-butadiene-1,3,2-chlorobutadiene-1,3, etc., but copolymerizability with other monomers It is preferable to use butadiene-1,3 in consideration of economy.

Examples of the ethylenically unsaturated monomer used in the present invention include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate,
Propyl methacrylate, butyl acrylate, butyl methacrylate, pentyl acrylate, pentyl methacrylate, hexyl acrylate, hexyl methacrylate, heptyl acrylate, heptyl methacrylate, octyl acrylate, octyl methacrylate, octadecyl acrylate, methacrylic acid Acrylic acid alkyl esters and methacrylic acid alkyl esters exemplified by octadecyl and the like; styrene, α-methylstyrene, vinyltoluene,
Ethylenically unsaturated aromatic monomers such as chlorostyrene and 2,4-dibromostyrene; acrylonitrile,
Unsaturated nitriles such as methacrylonitrile; acrylic acid,
Methacrylic acid, crotonic acid, maleic acid and its anhydrides, fumaric acid, itaconic acid, and unsaturated dicarboxylic acid monoalkyl esters such as monomethyl maleate,
Ethylenically unsaturated carboxylic acids such as monoethyl fumarate and mono-n-butyl itaconate; vinyl esters such as vinyl acetate and vinyl propionate; vinylidene halides such as vinylidene chloride and vinylidene bromide; acrylic acid-
Hydroxyalkyl esters of ethylenically unsaturated carboxylic acids such as 2-hydroxyethyl, 2-hydroxypropyl acrylate, and 2-hydroxyethyl methacrylate; ethylenically unsaturated carboxylic acids such as glycidyl acrylate and glycidyl methacrylate And radically polymerizable monomers such as acrylamide, acrylamide, methacrylamide, N-methylol acrylamide, N-methylol methacrylamide, N-butoxymethyl acrylamide and diacetone acrylamide.

Next, the polyurethane, polyester and epoxy resins suitable as the self-dispersing polymer used in the present invention will be described.

Self-dispersion polyurethane used in the present invention,
Polyurethane resins such as polyester polyols and polyether polyols, and polyurethane prepolymers consisting of aromatic or aliphatic or alicyclic diisocyanates are chain-extended with low molecular weight compounds having two or more active hydrogens such as diols and diamines. It refers to one that is stably dispersed in water. The following methods are known as dispersion methods.

(1) A method of imparting hydrophilicity by introducing an ionic group such as a hydroxyl group, an amino group, or a carboxyl group into a side chain or a terminal of polyurethane, and dispersing in water by self-emulsification.

(2) A method in which a water-soluble polyol such as polyethylene glycol is used as a polyol which is a main raw material of polyurethane to obtain hydrophilic polyurethane and the hydrophilic polyurethane is dispersed in water.

The water-dispersed polyurethane used in the present invention is not limited to the above-mentioned single dispersion method, and a mixture obtained by each method can be used. Examples of these water-dispersible polyurethanes include "Hydran" as a commercially available product.
The series (manufactured by Dainippon Ink and Chemicals, Inc.) can be mentioned.

The self-dispersible polyester according to the present invention is (1) copolycondensed with a dicarboxylic acid having an alkali metal salt of sulfonic acid in an aromatic nucleus, and (2) added with a polycarboxylic acid anhydride and neutralized with a base. , (3) those obtained by copolycondensing polyethylene glycol, and those obtained by combining these. Examples of the dicarboxylic acid having an alkali metal sulfonate in the aromatic nucleus used for the self-dispersion type polyester include alkali metal salts such as sulfoterephthalic acid, 5-sulfoisophthalic acid, and 4-sulfonaphthalene-2,7-dicarboxylic acid. To be Also included are ester-forming derivatives used in ordinary polyester production, such as lower alcohol ester compounds such as methyl esters and ethyl esters of these carboxylic acids. Among these, sodium salts and potassium salts are most preferable as the alkali metal salts of 5-sulfoisophthalic acid and sulfoterephthalic acid. The alkali metal sulfonate-containing compound is an essential component for making the polyester resin water-soluble, and the content naturally affects the dispersibility of the polyester resin in water. The self-dispersible polyester of the present invention includes those that are dispersed in water in an emulsion state to those that are incompletely dispersed. For example, the self-dispersible polyester may vary depending on the content of the sulfonic acid alkali metal salt-containing compound. Adjusted. When the amount of this compound is more than 15 mol% of the total carboxylic acid component, the water resistance of the obtained resin is remarkably reduced, and when it is less than 3 mol%, hydrophilicity becomes insufficient and a stable water-dispersed polyester resin may not be obtained. . The preferred amount used is 3 to 15 mol% of the total carboxylic acid component.

Other aromatic carboxylic acids include terephthalic acid, isophthalic acid, phthalic anhydride, 2,6-naphthalenedicarboxylic acid, biphenyldicarboxylic acid, trimellitic anhydride, pyromellitic dianhydride, etc., and their ester-forming derivatives. Is also included. Such an aromatic carboxylic acid is preferably used in an amount of 50 mol% or more of the total carboxylic acid component including the dicarboxylic acid having a sulfonic acid alkali metal salt in the aromatic nucleus, and when less than 50 mol%, the mechanical properties of the resulting resin are reduced. In addition to lowering the adhesiveness, the adhesiveness may increase. The amount of aromatic carboxylic acid used is preferably 70 mol% or more, particularly preferably 70 to 97 mol%.

As carboxylic acids other than aromatic carboxylic acids, succinic acid,
Maleic acid, fumaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dimer acid, cyclohexanedicarboxylic acid, and other aliphatic and alicyclic carboxylic acids, and the like, and ester-forming derivatives thereof included.

These carboxylic acids are used in the rest of the total carboxylic acids other than the aromatic carboxylic acids. Further, the polyol component is not particularly limited, and all the polyols usually used for polyester resins can be used. For example, ethylene glycol, diethylene glycol, propylene glycol, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, 1,4-bis (hydroxyethoxy) benzene, hydrogenated bisphenol A. , Polyoxyethylene glycol, polyoxypropylene glycol, polyoxytetramethylene glycol, glycerin, trimethylolpropane, trimethylolethane, pentaerythritol and the like.

When the content of alkali metal sulfonate is relatively high when water-dispersing such polyester, 40 ℃ to 100 ℃
It can be self-dispersed by just stirring it in warm water, and it can be made aqueous, but if the content of alkali metal sulfonate is relatively small and it is difficult to make it aqueous, a small amount of organic solvent such as lower alcohols, glycols, cellosolve can be used. It can also be made aqueous with the aid of compounds, cyclic ethers, ketones and the like. Examples of these water-dispersible polyesters include "Finetex-ES" series (manufactured by Dainippon Ink and Chemicals, Inc.) as commercially available products.

The self-dispersion type epoxy resin in the present invention is an epoxy resin obtained by modifying the epoxy resin with another compound and introducing a segment having an emulsifying power into the molecule to impart self-dispersing property.

For example, JP-A-53-1228 discloses a grafted epoxy obtained by polymerizing a monomer mixture containing a carboxylic acid monoer using a free radical generator such as benzoyl peroxide in the presence of an epoxy resin. It has been shown that the resin can be stably dispersed in an aqueous medium containing a base. As an example, there is a polymer represented by the structural formula (I) described below, and a commercially available product is Dick Fine GN-280 (manufactured by Dainippon Ink and Chemicals, Inc.).

In addition, JP-A-56-43362 discloses a composition obtained by reacting an epoxy resin and a carboxyl functional polymer in the presence of a specific tertiary amine.

Further, in JP-A-55-3481 and JP-A-55-3482, a self-dispersing epoxy capable of esterifying a carboxyl functional polymer with an epoxy resin in the presence of an amine esterification catalyst and self-dispersing in water with a base. Ester copolymers are disclosed.

The ratio of the self-dispersing polymer (A) to the conjugated diene and / or the ethylenically unsaturated monomer (B) used in the present invention is not particularly limited, but it is (A) / (B in terms of solid content weight ratio. ) = 5/95 to 95/5 is preferable.

The polymer aqueous dispersion in the present invention is prepared by a usual emulsion polymerization method under the reaction conditions of pH 3 to 5 and 0 to 100 ° C. for 5 to 15 hours. For example, in the presence of the self-dispersing polymer, the monomer (mixture) is dispersed in water, preferably without using an emulsifier, and a free radical generating catalyst such as KPS (K ₂ S ₂ O
_{3), APS ((NH 4} ) 2 S 2 O 8), aqueous catalyst such as hydrogen peroxide solution, t- butyl hydroperoxide, preferably the oil-based catalyst such as cumene hydroperoxide 40 ° C. ~
Emulsion polymerization may be carried out at 70 ° C. The resulting polymer aqueous dispersion has a pH of 5 to 8 and a viscosity of about 30 to 1000 cP, and more preferably an alkaline solution having a pH of 8 to 9 in order to improve stability.
Adjusted to.

In the present invention, additives usually used for emulsion polymerization, such as a chain transfer agent, ethylenediaminetetraacetic acid for the purpose of stabilizing polymerization and buffering effect, may be optionally used.

The polymer aqueous dispersion obtained by the above method is concentrated to a required solid content by a method such as stripping.

The foam obtained by using the composition obtained by adding other additives based on the polymer aqueous dispersion thus obtained has mechanical strength, heat resistance, cold resistance, light resistance, and light resistance. In terms of solvent properties and elasticity, it can exhibit excellent physical properties that cannot be obtained by conventional methods.

Examples of other additives include a foaming aid, a viscosity modifier, and a crosslinking agent.

As a foaming aid, sodium laurate, coconut oil soap, sodium myristate, ammonium stearate, sodium palmitate, sodium oleate,
Higher alcohol sodium sulfate, higher fatty acid amide sodium alkylsulfonate, saponin, gelatin, casein or the like is used. A fluorinated surfactant having a perfluoroalkyl group or a fluoroalkyl group having 1 to 20 carbon atoms is also used.

As the viscosity modifier, casein, alginate, arabic gum, bentonite, clay, carboxylated methyl cellulose, polyvinyl alcohol, polyvinylpyrrolidone copolymer, polyethylene oxide polymer, polyacrylic acid emulsion and the like are used. The addition amount of these is usually 0.1 to 5 parts, preferably 0.5 to 3 parts. Appropriate viscosity of synthetic resin emulsion is 1000 to 15000 cP.

As the crosslinking agent, water-soluble melamine-formaldehyde resin, water-soluble urea-formaldehyde resin, water-soluble or water-dispersible epoxy resin, aziridine compound, polyisocyanate resin and the like are used.

Addition of silicone oil is effective in sufficiently reflecting the properties of the foam obtained with elastic properties such as polyurethane resin. For example, dimethyl silicone oil,
Methylphenyl silicone oil, amino modified silicone oil, polyether modified silicone oil and the like can be mentioned. The added amount is 0.1 to 3 parts by weight based on 100 parts by weight of the emulsion. A pre-emulsion of silicone oil is also used.

In addition, a colorant, a filler, an antiaging agent, an antifungal agent and the like can be used within a range not impairing the object of the present invention.

Thus, the composition adjusted to an appropriate viscosity is then foamed by a method known in the rubber latex and converted into a composition having uniform and fine cells. In this case, mechanical foaming is the most general, but the type of foaming machine is not particularly limited, and those generally used for foaming rubber latex can be used. An example is as follows. A composition containing a random copolymer, adjusted to an appropriate viscosity, and further blended with a foaming aid, a viscosity modifier, a foam stabilizer, a cross-linking agent and the like as necessary is fed into a foaming machine by a gear pump or the like. On the other hand, gas (usually air) is sent to the foaming machine by a compressor or the like. Each flow rate is coated by a gauge. The emulsion and gas fed into the foaming machine are mixed therein, and by the rotating cylinder, the gas fed in is atomized and dispersed in the composition, and thus the foamed composition emerges from the foaming machine. Composition obtained by drying The amount of gas mixed (the ratio of gas to the composition), which is related to the density of the foamy substance, is performed by controlling the injection amount of gas, and the size of bubbles is the synthetic resin emulsion. It is controlled by the viscosity and the rotation speed of the cylinder. (It should be noted that a hand mixer is experimentally sufficient for foaming the composition.) In this case, the foaming ratio is generally 1.5 to 6.

The composition thus foamed is poured into a mold or cast on a substrate and dried. In this case, a doctor knife is generally used when applying a uniform thickness onto the substrate. As the base material, a fiber woven fabric, a fiber knitted fabric, a raised fabric, a flocked fabric thereof,
Examples thereof include textile products such as non-woven fabrics, paper, polyvinyl chloride sheets, leather sheets, release papers, releasable films such as polypropylene and polyester, glass plates, metal plates and the like.

The dispersion medium (water) is removed by drying the applied composition containing bubbles, and a foam-like substance having uniform and fine bubbles is obtained. Drying temperature is 60-160 ℃, preferably 1
It is 00 to 140 ° C. When the emulsion is cured by heat treatment, it is heat treated subsequent to drying.

EFFECTS OF THE INVENTION When the foam-forming composition according to the present invention is used, the bubbles formed are stable even at low temperatures, so that it is easy to form the foam on various substrates under all conditions, and the foam obtained is low. It has sufficient strength even at a density, that is, a high expansion ratio, and can be used for various purposes. For example, bags, clothing, shoes, synthetic leather for bags, artificial leather, other pseudo leather-like coated cloth,
Carpets (backings), kotatsu mats, entrance / bath mats, sponge sheets or other molded products, not only forming foams but also forming foams and forming adhesives while also forming an adhesive layer A method of use in which embossing is performed later may be included. For example, a foam layer is formed between the base material (I) and the base material (II) and the base materials are fixed at the same time, or a foam is formed on the upper part of one base material and the base material After that, a dense base material is fixed, or a foamed flock in which the foam also serves as a pile binder. In addition, the formed foam may be embossed to secondarily provide an uneven pattern. This is another feature of the foam of the present invention, which is constant heat /
It is an example showing good adhesion of the cell wall under pressure and a characteristic of high elasticity of the rest with high expansion ratio.

The above examples of applications and uses are not limited to this, but are merely examples utilizing the industrially useful broad foam-forming characteristics of the present invention.

Next, the present invention will be specifically described with reference to examples. The parts and% shown in the text are parts by weight and% by weight, unless otherwise specified.

Example 1 200 parts of ion-exchanged water in an autoclave replaced with nitrogen,
Butadiene 50 parts, styrene 40 parts, acrylonitrile 10
, Hydran AP-20 (water-dispersed polyurethane, Dainippon Ink and Chemicals, Inc.) 100 parts, polymerization temperature 55
At 0 ° C, 0.1 part of potassium persulfate was added to initiate polymerization.
The degree of polymerization reached 98.3% after 6 hours of polymerization initiation, and the mixture was cooled to obtain a polymer aqueous dispersion (A).

Add an aqueous solution of carboxymethyl cellulose to obtain a viscosity of 8000
After adjusting to cP, 1 part of silicone oil, 3 parts of glycerol triglycidyl ether and 4 parts of ammonium stearate were added and mixed uniformly.

This mixture was foamed by a continuous mechanical foaming machine (made by Suga Machinery), applied on cotton broad, and heat-treated at 120 ° C. for 8 minutes,
A foamed sheet having uniform fine bubbles and a smooth surface was obtained. It was confirmed that this foamed sheet was excellent in abrasion resistance and light resistance.

Example 2 As in Example 1, except that 100 parts of the water-dispersed polyurethane used in Example 1 was replaced with 100 parts of Finetex ES-675 (Dainippon Ink and Chemicals, Inc.), which is a water-dispersed polyester. Polymerization was carried out to obtain a polymer aqueous dispersion (B). Table 1 shows the physical properties of the composition obtained by blending this in the same manner as in Example 1.

Example 3 Example 1 except that 100 parts of the water-dispersed polyurethane used in Example 1 was replaced with 100 parts of the water-dispersed epoxy resin Dick Fine GN-280 (manufactured by Dainippon Ink and Chemicals, Inc.). Polymerization was performed in the same manner to obtain an aqueous polymer dispersion (C). Table 1 shows the physical properties of the composition obtained by blending this in the same manner as in Example 1.

Comparative Example 1 Ion-exchanged water was placed in an autoclave equipped with a stirrer that had been replaced with nitrogen.
0 part, LACSTAR DS-801 (manufactured by Dainippon Ink and Chemicals, Inc.) as a solid content 1.0 part, sodium diphenyl ether sulfonate (Newcol 271A, manufactured by Nippon Emulsifier Co., Ltd.) 1.0 part, tershade decyl mercaptan
0.5 parts of ethylenediamine tetraacetate of 0.1 parts were charged, and 100 parts of the monomer composition (50 parts of butadiene, 4 parts of styrene).
0.5 part of potassium persulfate was added to 0 part and 10 parts of acrylonitrile), and emulsion polymerization was carried out at 60 ° C. with stirring until the polymerization rate reached 99.0%. Next, 1.0 part of sodium hexametaphosphate and 0.5 part of sodium tripolyphosphate were added to 10 parts of the aqueous polymer dispersion after the polymerization.
% Solution of potassium hydroxide was added, and unreacted monomer was removed by steam distillation to concentrate the solid content to 5%.
An acrylonitrile-styrene-butadiene copolymer aqueous dispersion (D) having a viscosity of 5.0%, a viscosity of 100 cP and a pH of 8.9 was obtained. Table 1 shows the physical properties of the composition obtained by blending the obtained copolymer in the same manner as in Example 1.

Comparative Example 2 60 parts of butadiene, 30 parts of acrylonitrile, methacrylic acid
10 parts, 3 parts of sodium alkylbenzene sulfonate (Neoperex F-25, product of Kao Atlas), polyalkylene glycol ether having a polymer chain in which ethylene oxide and propylene oxide are randomly copolymerized at a molar ratio of 90:10 0.5 Parts (Targitol XD, manufactured by Union Carbide Co.), sodium pyrophosphate 0.5 parts, ethylenediamine tetraacetate ammonium 0.1 part, tertiary decyl mercaptan 0.3 parts, potassium persulfate 0.3 parts and ion-exchanged water 120 parts nitrogen-substituted autoclave with a stirrer. The resulting mixture was charged in a vessel and polymerized at 50 ° C. for 15 hours. Next, unreacted monomers were removed and concentrated by stripping to obtain an acrylonitrile-butadiene copolymer aqueous dispersion (E) having a solid content of 55%, a viscosity of 360 cP and a pH of 5.7. Table 1 shows the physical properties of the composition obtained by blending the obtained copolymer in the same manner as in Example 1.

In the table, (a) is the case of 2.5 times foaming liquid (1 mm application),
(B) is a 7 times foaming liquid (5 mm application) "The state of the foaming liquid" is the state of bubbles when the mechanical foaming liquid was received in a 500 cc beaker and after leaving it for 5 minutes, the upper layer about 1 cm thick part was scraped off. The state of bubbles was observed and compared for examination.

⊚: Bubbles are fine and uniform and do not change.

◯: Bubbles were fine and uniform, but slightly coarsened.

Δ: Air bubbles were slightly non-uniform and were considerably coarsened.

X: Remarkably inhomogeneous with a large amount of coarse bubbles.

The "foam state" was examined by observing the bubble state of the cross section of the foam and the smoothness of the surface.

⊚: The bubbles are fine and uniform, and the surface is smooth.

◯: There are coarsened bubbles and the surface smoothness is slightly inferior.

Δ: Coarse air bubbles and some cracks.

X: There is a crack.

"Abrasion strength" refers to Gakushin type abrasion tester (flat method load)
It was measured by the number of times up to 500 g).

◎: 1000 times or more good ○: 999 times to 200 times △: 199 times to 50 times ×: 49 times or less “Light resistance” was examined by the degree of discoloration after 20 hours of irradiation with a fade meter and the abrasion strength.

Discoloration degree ◎: No discoloration ○: Slightly yellowing △: Yellowing ×: Remarkably discoloring (yellowing)

Claims (3)

[Claims] 1. A foam comprising a polymer aqueous dispersion obtained by polymerizing a conjugated diene and / or an ethylenically unsaturated monomer in an aqueous medium containing a self-dispersing polymer. Forming composition. 2. The foam-forming composition according to claim 1, wherein the self-dispersing polymer is an aqueous polymer containing at least one selected from polyurethane, polyester and epoxy resin. 3. The foam-forming material according to claim 1, wherein the conjugated diene and / or ethylenically unsaturated monomer is butadiene and a mixture of butadiene and an ethylenically unsaturated monomer copolymerizable with butadiene. Composition.