WO2007111108A1

WO2007111108A1 - Anionic rubber latex and foam rubber

Info

Publication number: WO2007111108A1
Application number: PCT/JP2007/054562
Authority: WO
Inventors: Norihiro Sugihara; Hiromasa Miyazaki; Mitsuhiro Kinoshita; Hirofumi Fujita
Original assignee: Sumitomo Seika Chemicals Co., Ltd.
Priority date: 2006-03-29
Filing date: 2007-03-08
Publication date: 2007-10-04
Also published as: JP5328344B2; JPWO2007111108A1

Abstract

The object is to provide a latex suitable for a foam rubber of an ethylene-propylene-diene terpolymer and a foam rubber produced using the latex. Disclosed is an anionic ethylene-propylene-diene terpolymer rubber latex for use in a foam rubber. The terpolymer comprises 100 parts by weight of an ethylene-propylene-diene terpolymer rubber and 1 to 15 parts by weight of an anionic surfactant. Also disclosed is a foam rubber produced by foaming the latex and then coagulating/vulcanizing the foamed latex.

Description

Specification

Anionic rubber latex and foam rubber

Technical field

TECHNICAL FIELD [0001] The present invention relates to a rubber-based ethylene 'propylene' gen terpolymer rubber latex for foam rubber and a foam rubber obtained using the same.

Background art

[0002] Foam rubber (rubber foam) is used in many applications as foam sheets, cosmetic sponges (puffs), shock absorbers, and the like.

[0003] Foam rubber can be produced by adding foaming agent or vulcanizing agent to raw rubber and heating, foaming and vulcanization molding, or foaming rubber latex containing vulcanizing agent or foaming agent. In general, a method of forming a foam by solidifying this and then vulcanizing it is known. Among these, the latter method of foaming rubber latex is used as an excellent manufacturing method because the resulting foam has an open-cell structure, and a foam having superior cushioning properties and flexibility can be obtained. ing.

[0004] As rubber latex used in these methods, NBR latex (Japanese Patent Laid-Open No. 11 26 3846), SBR latex, natural rubber latex and the like are known. Wide range of rubbers with excellent heat resistance and weather resistance. Known latexes used for foam rubber in ethylene / propylene 'terpolymer rubbers are known.

Disclosure of the invention

Problems to be solved by the invention

[0005] An object of the present invention is to provide a latex suitable for foam rubber of ethylene 'propylene' gen terpolymer rubber and a foam rubber obtained using the latex.

Means for solving the problem

[0006] The present invention relates to an anionic ethylene 'propylene for foam rubber as shown below.

• Gen provides terpolymer rubber latex and foam rubber.

[0007] 1. Ethylene / propylene / gen terpolymer rubber 100 parts by weight A foam rubber rubber-containing ethylene-propylene.gen terpolymer rubber latex containing 1 to 15 parts by weight of a surface active agent.

[0008] 2. The ergonal ethylene 'propylene according to item 1, further comprising a pH adjusting agent.

• Gen terpolymer rubber latex.

[0009] 3. The ionic ethylene 'propylene' gen 3 according to item 2 above, wherein the pH adjuster is at least one selected from the group consisting of citrate, maleic acid, succinic acid and oleic acid. Original copolymer rubber latex.

[0010] 4. The ionic ethylene 'propylene' gen terpolymer rubber latex according to any one of the above items 1 to 3, wherein the pH is 9.0 to LO: 5.

[0011] 5. The ionic surfactant according to any one of the above items 1 to 4, wherein the surfactant is at least one selected from the group consisting of potassium oleate, sodium oleate and potassium rosinate. -On-state ethylene 'propylene' gen terpolymer rubber latex.

[0012] 6. The ionic ethylene.propylene.gen terpolymer rubber latex according to any one of the above items 1 to 5, wherein the solid content concentration force is 0 to 70% by weight.

[0013] 7. Foam rubber obtained by foaming, coagulating, and calosulfating the terionic ethylene 'propylene' gen terpolymer rubber latex according to any one of items 1 to 6 above .

[0014] Hereinafter, the present invention will be described in detail.

[0015] The rubber-based ethylene 'propylene' gen terpolymer rubber latex for foam rubber of the present invention comprises 100 parts by weight of ethylene 'propylene' gen terpolymer rubber and an anionic surfactant. Includes 1 to 15 parts by weight.

[0016] The ethylene 'propylene' gen terpolymer rubber used in the present invention is a terpolymer of ethylene, propylene and a gen component, as long as it has ordinary rubber elasticity. The composition ratio is not particularly limited. The gen component is not particularly limited, and examples thereof include non-conjugated gens such as 1,4-monohexagen, dicyclopentagen, 5 ethylidene 2 norbornene and 5 bur norbornene.

[0017] Examples of the anionic surfactant used in the present invention include polyoxyethylene. Polyoxyalkylene alkyl ether sulfates such as alkyl ether sulfates, polyoxyalkylene phenyl ether sulfates such as polyoxyethylene alkyl phenol ether sulfates, alkyl benzene sulfonates, alkyl naphthalene sulfonates, alkyl diphenylsヱ Nyl sulfonate, alkane sulfonate, alkyl sulfate, naphthalene sulfonate formalin condensate, dialkyl sulfosuccinate, polyoxyethylene alkyl ether acetate, rosinate, and fatty acids such as sodium fatty acid and fatty acid potassium A salt etc. can be mentioned. These may be used alone or as appropriate.

Two or more kinds may be used in combination.

[0018] Among these anionic surfactants, it is preferable to use a rosin acid salt and a fatty acid salt such as sodium fatty acid and potassium fatty acid. Particularly, potassium oleate, sodium oleate, potassium rosinate and the like are used. When used, more favorable results are obtained.

[0019] The amount of the anionic surfactant used in the present invention is preferably 1 to 15 parts by weight with respect to 100 parts by weight of ethylene 'propylene' gen terpolymer rubber, and 2 to 10 parts by weight. More preferably. If the amount of the anionic surfactant used is less than 1 part by weight, a stable emulsion may not be obtained. On the other hand, if it exceeds 15 parts by weight, emulsification is easy, but it is uneconomical, and various physical properties of foam rubber that can provide the ability of ter-on ethylene 'propylene' terpolymer rubber latex are impaired. There is a risk of being.

[0020] In addition to the anionic surfactants as described above, nonionic surfactants or canyon-based polymer dispersion stabilizers may be used in combination.

[0021] Examples of the non-ionic surfactant include polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene sorbitan alkylate, oxyethyleneoxypropylene block copolymer, Examples thereof include polyglycerin esters. Examples of the polymer dispersion stabilizer include polybulal alcohol, hydrangea chinose resinose, methino resin glycerol, hydroxypropino resin glycerol, poly acrylate, polyacrylate salt, alginate, etc. Can be mentioned.

[0022] The rubber-based ethylene'propylene-gen terpolymer rubber latex for foam rubber of the present invention preferably further contains a pH adjuster.

[0023] The pH adjuster is not particularly limited as long as the pH of the latex can be adjusted. Hydrochloric acid, sulfuric acid, acetic acid, formic acid, oleic acid, succinic acid, succinic anhydride, maleic acid, maleic anhydride, fumaric acid, malonic acid, lactic acid, citrate, darconic acid, sodium kale fluoride, potassium key fluoride, titanium key Examples thereof include sodium chloride. Among these, P

From the viewpoint of easy adjustment of H, citrate, maleic acid, succinic acid and the like having high solubility in water are preferably used. When oleic acid is used as a pH adjuster, alkali metal hydroxide and excess oleic acid are added and reacted in the reaction system, and the resulting alkali metal oleate is anionic. It can be used as a system surfactant and the remaining excess amount of oleic acid can be used as a pH adjuster.

[0024] The amount of the pH adjuster used may be appropriately set so that the latex has a desired pH.

In the present invention, by using a pH adjuster, the pH of the terpolymer ethylene 'propylene' gen terpolymer rubber latex is preferably 9.0 to 10.5, more preferably 9.2 to By adjusting to 10.0, better foam rubber can be obtained. In particular, when the Dunlop method, which will be described later, is used as the coagulation method, if the pH exceeds 10.5, the time until coagulation (gelation) starts is prolonged, during which bubbles are destroyed and a good foam is obtained. May not be generated. If the pH is less than 9.0, the stability of the latex may be poor and agglomerates may be formed, and since the coagulation time will be shortened, coagulation will begin before foaming and the desired shape cannot be formed There is a fear. As a method of adding the pH adjuster, a method of adding a predetermined pH adjuster to the organic phase or the aqueous phase prior to emulsification without limitation, or adding a pH adjuster to the obtained latex. It is possible to use a method of adding the raw material by dissolving it in coconut or water.

[0025] The eron ethylene 'propylene' gen terpolymer rubber latex of the present invention is obtained by using an ethylene-propylene gen terpolymer rubber latex and a eron-based surfactant. It is obtained by chemical dispersion. The production method includes, for example, (1) an organic phase in which an ethylene 'propylene' terpolymer rubber is dissolved in an organic solvent, and an aqueous phase in which a ionic surfactant is dissolved in water. (2) Ethylene / propylene / gen terpolymer rubber is heated in an aqueous medium in the presence of a ionic surfactant. Examples thereof include a method of stirring and emulsifying and dispersing and then cooling.

[0026] Production of the terionic ethylene / propylene / gen terpolymer rubber latex of the present invention As the production method, the method (1) is preferably used from the viewpoint that the ethylene / propylene terpolymer rubber is easily dissolved in an organic solvent.

[0027] In the production method of (1) above, the organic solvent used in preparing the organic phase containing the ethylene 'propylene' gen terpolymer rubber is not particularly limited. Examples include aliphatic hydrocarbon organic solvents such as pentane, hexane, heptane and octane, alicyclic hydrocarbon organic solvents such as cyclohexane, and aromatic hydrocarbon organic solvents such as benzene, toluene and xylene. . These organic solvents may be used alone or in combination of two or more. In addition, use lower alcohols such as methanol, ethanol, isopropyl alcohol, and t-butanol as emulsification aids.

[0028] When the organic phase is prepared, the dissolution ratio of the ethylene 'propylene' gen terpolymer rubber is not particularly limited, but the solid content concentration in the organic phase is 5 to 50% by weight. It is preferable to set so that The melting temperature is not particularly limited and is usually dissolved at a temperature up to 100 ° C.

[0029] In the production method (1), when preparing an aqueous phase in which a ionic surfactant is dissolved, the ionic surfactant is usually added to the aqueous phase and dissolved. However, when a fatty acid salt is used as a cation-based surfactant, the fatty acid is added to the organic phase, and the hydroxide or alkali metal necessary for the neutralization is added to the aqueous phase and emulsified. In this case, the organic phase and the aqueous phase may be mixed, and the fatty acid may be reacted with the hydroxide or alkali metal at the boundary surface to form a fatty acid salt. Here, when oleic acid is used as the fatty acid, for example, if the oleic acid is allowed to remain at a neutralization degree of 80% to 90% with hydroxy-alkali metal, the residual oleic acid functions as a pH adjuster. In some cases, it may not be necessary to add additional pH adjusters. The addition amount of the anionic surfactant is not particularly limited, but is preferably set so that the concentration in the aqueous phase is 0.1 to 50% by weight.

[0030] Through the step of mixing and emulsifying an organic phase containing ethylene 'propylene' gen terpolymer rubber and an aqueous phase containing a char-on surfactant, the organic phase and the aqueous phase are mixed. The mixing ratio is preferably set so that the aqueous phase is 20 to 500 parts by weight with respect to 100 parts by weight of the organic phase. More preferably, the water phase is set to 25 to 200 parts by weight. If the aqueous phase is less than 20 parts by weight, it may not be emulsified, and the resulting emulsion may have a very high viscosity. If the aqueous phase exceeds 500 parts by weight, emulsification is possible, but productivity is poor and impractical.

[0031] The method for mixing and emulsifying the organic phase and the aqueous phase is not particularly limited, and stirring and mixing is performed using an emulsifier having an appropriate shearing force, such as a homogenizer or a colloid mill. It is possible to adopt a method or a method of dispersing and mixing using an ultrasonic disperser or the like. Usually, it is preferable to employ a method of stirring and mixing. Moreover, the temperature at the time of emulsification is not particularly limited, but is preferably set in the range of 5 to 100 ° C.

[0032] The ergonal ethylene 'propylene' gen terpolymer rubber latex of the present invention is obtained by distilling off the organic solvent from the emulsion obtained by the above emulsification step. The organic solvent can be distilled off according to a normal distillation method in which the emulsion is heated under reduced pressure. The ionic ethylene 'propylene' gen terpolymer rubber latex thus obtained has a desired solid content concentration by operation such as heat concentration, centrifugation, and wet separation, if necessary. It can also be concentrated.

[0033] In the present invention, the solid content concentration of the vinyl-on ethylene.propylene.gen terpolymer rubber latex is preferably 40 to 70% by weight, more preferably 45 to 65% by weight. If the solid content is less than 40% by weight, the rate of volume change is large when the latex is coagulated, and bubbles cannot be stably maintained during coagulation and vulcanization, and a good foam rubber may not be obtained. . When the solid content concentration exceeds 70% by weight, the foam can be produced without any problem, but it is difficult and practical to concentrate to this concentration industrially.

[0034] The median particle diameter of the eron ethylene propylene terpolymer rubber latex of the present invention is preferably 0.1 to 3 µm. If the median particle size is less than 0.1 μm, the stability of the latex will increase. The foam rubber may be weakened because the partition walls become thinner. If the median particle diameter exceeds 3 m, the number of bubbles that can be lost is decreased as the stability of the latex is deteriorated, and good foam rubber may not be obtained. This median particle size can be achieved by appropriately adjusting the stirring and mixing operation in the emulsification step. [0035] The method for producing the foam rubber using the ergonal ethylene propylene terpolymer rubber latex of the present invention is not particularly limited, and a known method can be used. For example, a method of foaming, coagulating, and vulcanizing a vinylon ethylene 'propylene' gen terpolymer rubber latex is used. In this case, first, a composition obtained by adding a compounding agent such as a vulcanizing agent, a vulcanizing aid, and a foaming agent to the terpolymeric ethylene.propylene.gen terpolymer rubber latex of the present invention is prepared. Prepare. In addition to these, an anti-aging agent, a colorant, a film forming aid, a foam stabilizer, and the like may be added as necessary.

[0036] As the vulcanizing agent and the vulcanizing aid, those used for crosslinking of ethylene 'propylene' gen terpolymer can be used without particular limitation. Examples of the vulcanizing agent include sulfur, colloidal sulfur, peracid oxide, and the like. As a vulcanization aid, for example, it is often used in a combination of zinc white and a vulcanization accelerator. Examples of the vulcanization accelerator include 2-mercaptobenzothiazole and its zinc salt, thiazole accelerators such as dibenzothiazyl disulfide, and dithiocarbamate accelerators such as zinc jetyldithiocarbamate. Etc. The amount of these vulcanizing agents and vulcanizing auxiliaries is not particularly limited, but 0.1 to 10 parts by weight of vulcanizing agent, 100 parts by weight of ethylene 'propylene' gen terpolymer rubber, zinc Hana 0.5 ~: L0 part by weight, vulcanization accelerator 0.1 ~: L0 part by weight is preferable.

[0037] Examples of foaming agents include surfactants such as potassium oleate and sodium lauryl sulfate.

1 to 5 parts by weight is blended.

[0038] In the foam rubber of the present invention, the above-mentioned compounding agent is added to the ergonal ethylene 'propylene-gen terpolymer rubber latex of the present invention, foamed at a predetermined magnification, and then coagulated. Is added and solidified, and then vulcanized by heating.

[0039] Foaming is performed by stirring and foaming while blowing air using a high-speed stirrer, Oaks foamer, ultrasonic foamer, or the like.

[0040] The coagulation method is not particularly limited, and a known method can be used. Examples thereof include a durop method using sodium fluoride, potassium fluoride, titanium sodium fluoride, and the like as a coagulant, a thermal coagulation method using organopolysiloxane, polybutyl methyl ether, and the like, or a freeze coagulation method. The amount of coagulant used is not particularly limited. However, it is preferably about 0.5 to 15 parts by weight per 100 parts by weight of the ethylene 'propylene' gen terpolymer rubber.

[0041] Solidification needs to be started after the foam has been transferred to a predetermined mold in a fluid state. Then, for example, it is vulcanized by heating for about 15 to 120 minutes at a temperature of 100 to 200 ° C. After the vulcanization is completed, the rubber foam is obtained by taking it out of the mold, washing it with water and drying it.

[0042] Since the foam rubber of the present invention has an open-cell structure, it has excellent heat resistance, weather resistance, and flexibility. Cosmetic puff materials, automobile-related products, electrical and electronic equipment-related products, It can be used effectively as a cushioning material and sealing material for home-related products.

The invention's effect

[0043] The teron ethylene 'propylene' gen terpolymer rubber latex of the present invention is a latex suitable for foam rubber, and is excellent in heat resistance, weather resistance and flexibility from the latex. Foam rubber is obtained.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

[0045] The median particle size of the latex obtained in the following examples was measured using a laser diffraction particle size distribution analyzer (rSALD-2000Jj, manufactured by Shimadzu Corporation).

[0046] Example 1

Ethylene 'propylene' Gen terpolymer rubber (manufactured by Sumitomo Chemical Co., Ltd. "Esprene E 505", ethylene content 50 wt ^_0/0) was dissolved in a mixed solvent of hexane 230g of isopropyl alcohol 40g f the 25 g, Orein 0.6 g of acid was added. On the other hand, a solution prepared by dissolving 0.12 g of potassium hydroxide (corresponding to 100% neutralization of oleic acid) in 150 g of water was prepared. These two solutions are stirred and mixed for 2 minutes at a rotational speed of 12000 rpm using a TK homomixer (“M type” manufactured by Tokushu Kika Kogyo Co., Ltd.), and the ethylene / propylene / gen terpolymer rubber is mixed. Emulsified. By heating this emulsion under reduced pressure, hexane, isopropyl alcohol and a part of water were distilled off to obtain a terpolymer ethylene-propylene-gen terpolymer rubber latex. The solid concentration of the obtained latex is 50 weight ^_0/0, p H was 10.1, and the median particle size was 1.

[0047] To 50 g of the above-mentioned ethylene-propylene-propylene terpolymer rubber latex, 0.5 g of colloidal sulfur, 1.3 g of zinc white and 0.5 g of dibenzothiazyl disulfide were dispersed. It was added and sufficiently dispersed to obtain a latex composition for foam rubber. This latex composition was put into a 200 ml beaker and foamed by stirring at 1400 rpm using a homodisper while feeding air at a flow rate of 10 ml per minute. Thereafter, 3.8 g of a sodium fluoride dispersion (solid content 20% by weight) was added and mixed. Subsequently, the obtained foam was put into a 10 cm × 10 cm × 2 cm mold and solidified. After that, vulcanized at 150 ° C for 20 minutes, taken out of mold force, washed with water and dried to obtain foam rubber

[0048] Example 2

Ethylene 'propylene' Gen terpolymer rubber (manufactured by Sumitomo Chemical Co., Ltd. "Esprene E 505", ethylene content 50 wt ^_0/0) and the 30g was dissolved in a mixed solvent of heptane 260g of isopropyl alcohol 10g. On the other hand, a solution prepared by dissolving 1.5 g of sodium oleate in a mixed solution of 140 g of water and 10 g of isopropyl alcohol was prepared. These two solutions were stirred and mixed for 2 minutes at a rotational speed of 12000 rpm using a TK homomixer (“M type” manufactured by Tokushu Kika Kogyo Co., Ltd.) to emulsify the ethylene 'propylene' gen terpolymer rubber. . By heating this emulsion under reduced pressure, heptane, isopropyl alcohol and a part of water were distilled off to obtain a vinylon ethylene / propylene ′ terpolymer rubber latex. The latex obtained had a solid content of 65% by weight, a pH of 10.2, and a median particle size of 1.4 m. After obtaining a latex composition for foam rubber using the same method as in Example 1, foam rubber was obtained by foaming, coagulation and vulcanization.

[0049] Example 3

Ethylene 'propylene' Gen terpolymer rubber (manufactured by Sumitomo Chemical Co., Ltd. "Esprene E - 505", ethylene content 50 wt ^_0/0) 30g was dissolved in a mixed solvent of toluene 230g and isopropyl alcohol 4 0 g. On the other hand, a solution prepared by dissolving 4.0 g of potassium rosinate in 150 g of water was prepared. These two solutions are stirred and mixed for 2 minutes at a rotational speed of 12000 rpm using a TK homomixer (“M type” manufactured by Tokushu Kika Kogyo Co., Ltd.). The terpolymer rubber was emulsified. By heating this emulsion under reduced pressure, toluene, isopropyl alcohol and a part of water were distilled off to obtain a vinylon ethylene / propylene / gen terpolymer rubber latex. The resulting latex had a solid content concentration of 45% by weight, a pH of 10.5, and a median particle size of 1. A foam rubber latex composition was obtained using the same method as in Example 1, and then foam rubber was obtained by foaming, coagulation and vulcanization.

[0050] Example 4

§ obtained in the same manner as in Example 1 - ON ethylenically 'propylene Gen 3 Mototomokasane polymer rubber latex 50g (. PH10 1), was added 10 weight ^_0/0 succinic acid dispersion 1. 3 g , PH was adjusted to 9.2. Next, a foam rubber latex composition was obtained in the same manner as in Example 1, and then foam rubber was obtained by foaming, coagulation, and vulcanization.

[0051] Example 5

§ obtained in the same manner as in Example 2 - ON ethylenically 'propylene' Gen 3 Mototomokasane polymer rubber latex 50g (. PH10 2), was added 10 weight ^_0/0 Kuen acid dispersion 1. 2 g , PH was adjusted to 9.4. Next, a foam rubber latex composition was obtained in the same manner as in Example 1, and then foam rubber was obtained by foaming, coagulation, and vulcanization.

[0052] Example 6

§ obtained in the same manner as in Example 3 - in-one ethylenically 'propylene' Gen 3 Mototomokasane polymer rubber latex 50g (. PH10 5), it was added 10 weight ^_0/0 maleic acid dispersion 1. 5 g The pH was adjusted to 9.5. Next, a foam rubber latex composition was obtained in the same manner as in Example 1, and then foam rubber was obtained by foaming, coagulation, and vulcanization.

[0053] Example 7

Ethylene 'propylene' Gen terpolymer rubber (manufactured by Sumitomo Chemical Co., Ltd. "Esprene E 505", ethylene content 50 wt ^_0/0) after the 25g was dissolved in a mixed solvent of heptane 203g of isopropyl alcohol 22 g, Orein acid 1. 5g was added. On the other hand, a solution prepared by dissolving 0.26 g of potassium hydroxide (equivalent to 87% neutralization of oleic acid) in 140 g of water was prepared. These two solutions are stirred and mixed at a rotational speed of 12000 rpm for 2 minutes using a TK homomixer (“M type” manufactured by Tokushu Kika Kogyo Co., Ltd.), and ethylene / propylene / gen terpolymer rubber is mixed. Emulsified. By heating this emulsion under reduced pressure, heptane, isopropyl alcohol and a part of water were distilled off to obtain a terpolymer ethylene-propylene-gen terpolymer rubber latex. The resulting 50 weight ^_0/0, pH solid content of the latex is 9.4, median particle size was 1. 6 m. A foam rubber latex composition was obtained in the same manner as in Example 1, and then foam rubber was obtained by foaming, coagulation and vulcanization.

[0054] [Evaluation of foam rubber]

In Examples 1 to 7, the shape retention rate (%) when foam rubber was molded was calculated by the following method. The results are shown in Table 1.

[0055] The thickness (mm) of the obtained foam (foam rubber) is measured, and the shape retention rate (%) is calculated according to the following formula.

Shape retention rate (%) = [thickness of the obtained foam Z thickness (20mm)] X 100

The higher the shape retention rate, the better the foam retention, and it can be said that the foam rubber is good.

[0056] [Table 1]

table 1

[0057] As is apparent from Table 1, in Examples 4 to 7, the coagulation time became the optimal time by adjusting the pH of the latex, so that the shape retention rate power of the obtained foam rubber was It turns out that it became higher than Examples 1-3.

[0058] Comparative Example 1

In Example 3, instead of potassium rosinate, polyoxyethylene alkylphenol The same procedure as in Example 3 was performed except that luether (a non-one surfactant) was used, and a non-one ethylene “propylene” gen terpolymer rubber latex was obtained. After a foam rubber latex composition was obtained using the same method as in Example 1, foaming and coagulation were carried out.

Comparative Example 2

In Example 2, the same operation as in Example 2 was carried out except that sodium oleate was changed to 0.15 g. However, the latex became an agglomerate upon removal of the solvent, and the ionic ethylene Propylene gen terpolymer rubber latex was not obtained.

Claims

The scope of the claims

[1] ethylene-propylene-gen terpolymer rubber 100-part by weight and er-on ethylene / propylene for foam rubber containing 1-15 parts by weight of a surfactant surfactant

• Gen terpolymer rubber latex.

[2] The char-on ethylene “propylene” terpolymer rubber latex according to claim 1, further comprising a pH adjuster.

[3] The terionic ethylene / propylene / gen terpolymer according to claim 2, wherein the pH adjuster is at least one selected from the group consisting of citrate, maleic acid, succinic acid and oleic acid. Rubber latex.

[4] The ionic ethylene 'propylene' gen according to claim 1, wherein the pH is 9.0 to: L0.5.

Ternary copolymer rubber latex.

[5] The ionic ethylene propylene according to claim 1, wherein the ionic surfactant is at least one selected from the group consisting of potassium oleate, sodium oleate, and rosin acid. Gen terpolymer rubber latex.

[6] The char-on ethylene / propylene / gen terpolymer rubber latex according to claim 1, having a solid content of 40 to 70% by weight.

[7] A foam rubber obtained by foaming, solidifying and vulcanizing the rubber-based ethylene'propylene-gen terpolymer rubber latex according to claim 1.