JPH06271697A - Sponge rubber roll - Google Patents

Abstract

PURPOSE:To provide a sponge rubber roller which has excellent surface smoothness, easily controllable electrical resistance, thus is useful in OA appliances by vulcanizing and foaming a specific green rubber composition. CONSTITUTION:A green rubber composition comprising (A) a chlorinated ethylene-alpha-olefin copolymer where the alpha-olefin is preferably of 3 to 10 carbon atoms, most preferably 1-butene, the copolymerization molar ratio of ethylene to a-olefin is 75/25 to 95/5, chlorine content is 20 to 40wt.%, and the Mooney viscosity [ML1+4 (121 deg.C)] is 10 to 190, (B) a vulcanizer such as triazine-2,4,6-trithiol, (C) a foaming agent such as sodium hydrogen carbonate, is vulcanized and foamed in a can to give the objective molded foam.

Description

Detailed Description of the Invention

[0001]

The present invention relates to chlorinated ethylene / α-
Regarding the olefin copolymer rubber sponge rubber roll, it has a skin layer with excellent surface smoothness, which is obtained by vulcanizing and foaming with a vulcanizing can, the foam cells are fine and uniform, and the electrical resistance value of the product is The present invention relates to a chlorinated ethylene / α-olefin copolymer rubber sponge roll having a small variation.

[0002]

2. Description of the Related Art Sponge rubber rolls used in OA equipment and the like are manufactured mainly by vulcanization foam molding using a vulcanization can. When a vulcanization can is used, it is more difficult to control the shape of the molded product than press vulcanization molding or injection vulcanization molding.Therefore, the surface of the foam vulcanized and foamed using the vulcanization can be polished. It is manufactured through many post-processing steps such as processing into a cylindrical shape, attaching a solid rubber skin thereon, and further applying a conductive paint or the like if necessary. Further, it is important to control the electric resistance value in rolls for these applications. That is, in a roll used in, for example, a copying machine, if the electric resistance value is out of the standard, the copied characters and figures are distorted.
In general, ethylene / propylene / non-conjugated diene copolymer rubber (EPDM) and silicone rubber (Q rubber), which have excellent weather resistance and heat resistance, are used as the raw material rubber for these sponge rolls, and their electrical resistance values are -Controlled with the amount of Bonblack added. However, in these rubbers, the electrical resistance changes abruptly with a slight variation in the amount of carbon black compounded, so controlling the electrical resistance value is extremely difficult, and despite strict process control. The product yield is low.

[0003]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above problems, and a sponge rubber roll that does not require a post-processing step can be molded in one step and has a small variation in electric resistance. (EN) Provided is a sponge rubber roll made of chlorinated ethylene / α-olefin copolymer rubber, which can be easily controlled. [Detailed Description of the Invention] The above-mentioned problem is a specific chlorinated ethylene / α-in the method for producing a sponge using vulcanization.
The inventors have found that a problem can be solved by using an olefin copolymer rubber and putting an unvulcanized compounded rubber in a molding die to complete the present invention.

According to the present invention, the chlorine content is 20 to 40% by weight and the Muni-viscosity [ML1 + 4 (121 ° C)] is 1.
A sponge rubber roll composed of a molded product obtained by putting an unvulcanized compounded rubber using a chlorinated ethylene / α-olefin copolymer rubber of 0 to 190 into a molding die and vulcanized and foamed using a vulcanizing can. Provided. The chlorinated ethylene / α-olefin copolymer rubber used in the present invention is obtained by chlorinating the ethylene / α-olefin copolymer rubber. The α-olefin of the ethylene / α-olefin copolymer before chlorination preferably has 3 to 10 carbon atoms. Propylene, 1-butene, 4-methyl-pentene-1, and hexene are more preferable, and 1-butene is still more preferable. The composition ratio of ethylene and α-olefin is preferably ethylene / α-olefin; 75/25 to 95/5 on a molar basis.

The ethylene / α-olefin copolymer may be copolymerized with other polymerizable components in addition to the above components, and particularly, the total weight of ethylene / α-olefin units is 10
0-g, 5-vinyl-2-norbornene up to 30
It is preferably contained in millimoles. The ethylene / α-olefin copolymer is a rubber-like polymer obtained by randomly polymerizing the above components.

The chlorinated ethylene / α-olefin copolymer rubber is obtained by chlorinating the ethylene / α-olefin copolymer obtained above.

The chlorination of the above-mentioned copolymer is carried out, for example, by pulverizing the copolymer into fine particles, and making the fine particles into an aqueous suspension state,
A method of contacting with molecular chlorine at a temperature of about 70 to 90 ° C.,
A method in which a copolymer is dissolved in a solvent stable to chlorine such as carbon tetrachloride, chloroform and tetrachloroethylene and brought into contact with molecular chlorine in a uniform solution state, or N-chloroacetamide, N-chloro A chlorine compound such as succinimide or 1,3-dichloro-5,5-dimethylhydantoin is uniformly kneaded into the copolymer with a roll or Banbury, and heated to a temperature at which chlorine is liberated. Particularly preferred is a method in which chlorine is blown in the presence of a radical initiator in a halogen-based solvent such as carbon tetrachloride or chloroform.

After the chlorination reaction, it is treated as follows. In case of chlorination in aqueous suspension, chlorinated ethylene
The α-olefin copolymer rubber is washed with water to remove molecular chlorine and hydrogen chloride produced as a by-product, and dried. In the case of chlorination in a solution state, the reaction solution is put in an excess solvent of a chlorinated ethylene / α-olefin copolymer rubber such as methanol, the precipitate is filtered, and washed with this solvent. dry.

The chlorinated ethylene / α-olefin copolymer rubber used in the present invention has a chlorine content of 20 to 40% by weight, preferably 25 to 35% by weight, and chlorination is carried out within this range. . Also, the Mooney viscosity [ML
1 + 4 (121 ° C)] is 10 to 10 from the viewpoint of physical properties and workability.
190, preferably 20-150, more preferably 3
Those of 0 to 120 are used.

The sponge rubber roll of the present invention is formed from a molded product obtained by vulcanizing and foaming an unvulcanized compounded rubber composed of the above chlorinated ethylene / α-olefin copolymer rubber, a vulcanizing agent, a foaming agent and the like. It will be.

In the sponge rubber roll of the present invention,
Chlorinated ethylene / α-olefin copolymer rubber and vulcanizing agent,
A compounding agent known per se according to the processability and the required performance in producing a foam in addition to the foaming agent, for example, a vulcanization aid, a foaming aid, a conductivity-imparting agent, a rubber reinforcing agent, filler,
Softener, metal activator, anti-scorch agent, hydrochloric acid absorbent,
Anti-aging agents, processing aids and the like can be added. In the sponge rubber roll of the present invention, chlorinated ethylene / α-
Rubber other than olefin copolymer rubber is chlorinated ethylene / α
-It can be used in combination with an olefin copolymer rubber.

In the present invention, triazine vulcanization, organic peroxide vulcanization, and the like are effective as vulcanization methods for compounded rubber. When triazine vulcanization is performed, the vulcanizing agent is
A triazine compound represented by the following general formula is used.

[0013]

[Chemical 1] (In the formula, R1 represents -NR2R3, -OR2 or -SR2, where R2 and R3 each represent a hydrogen atom, an unsubstituted or substituted alkyl group, or an unsubstituted or substituted aryl group. ) Triazinethiols represented by

Specific examples of the triazinethiols represented by the general formula 1 include triazines 2,4 and
6-trithiol, 2-dibutylaminotriazine 4,
6-dithiol, 2-phenylaminotriazine 4,6
-Dithiol, 2-hexylaminotriazine 4,6-
Examples thereof include dithiol, 2-diethylaminotriazine 4,6-dithiol, and 2-butoxytriazine 4,6-dithiol. Vulcanizing agent is chlorinated ethylene
1 × 10 −3 per 100 g of α-olefin copolymer rubber
2.5 × 10 −2 mol, preferably 1.5 × 10 −3 to 2 ×
10 -2 mol, more preferably 3 x 10 -3 to 1.3 x 10
-Mixed at a ratio of 2 mol.

When a triazine compound is used as a vulcanizing agent, a vulcanizing aid is added. The vulcanization aid is added to make the vulcanization rate practical for processing and molding. As the vulcanization aid, an onium salt, an organic base having an acid dissociation constant (pKa) of 7 or more, or a compound capable of generating an organic base is used.

Specific examples of these vulcanization aids include:
Distearyldimethylammonium chloride, tetramethylammonium chloride, tetrabutylammonium chloride, distearyldimethylammonium bromide, tetramethylammonium bromide, tetrabutylammonium bromide, distearyldimethylphosphonium chloride, tetramethylphosphonium chloride, tetrabutylphosphonium chloride , Quaternary onium salts such as distearyldimethylphosphonium bromide, tetramethylphosphonium bromide and tetrabutylphosphonium bromide; 1,8-diazabicyclo (5,4,0) undecene-
7, compounds such as amines such as piperidine, piperazine, dicyclohexylamine, dibutylamine, and organic acid salts thereof can be mentioned.

The vulcanization aid is 5 × 10 -4 to 2 × 10 5 per 100 g of chlorinated ethylene / α-olefin copolymer rubber.
-2 mol, preferably 1.times.10@-3 to 1.times.10@-2 mol, used alone or in combination of two or more.

When organic peroxide vulcanization is carried out, vulcanizing agents such as dicumyl peroxide, 2,5-dimethyl-2,
5-di (tert-butylperoxy) hexane, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexyne-3, di Examples thereof include tert-butyl peroxide, di-tert-butylperoxy-3,3,5-trimethylcyclohexane, and tert-dibutylhydroperoxide. Among them, dicumyl peroxide, di-tert-butyl peroxide, di-tert-butylperoxy-3, 3,5-Trimethylcyclohexane is preferably used.

The amount of the organic peroxide used is usually 3 with respect to 100 g of the chlorinated ethylene / α-olefin copolymer rubber.
× 10 -3 to 5 × 10 -2 mol, preferably 1 × 10 -3 to 3
It is used in the range of × 10 -2 mol.

When an organic peroxide is used as a vulcanizing agent, it is preferable to use a vulcanizing aid together. As the vulcanization aid, sulfur, quinonedioxime such as P-quinonedioxime,
Examples include acrylics such as ethylene glycol dimethacrylate and trimethylolpropane trimethacrylate, allyls such as diallyl phthalate and triallyl isocyanurate, maleimides and divinylbenzene.

Such a vulcanization aid is used in an amount of 0.5 to 2 moles, preferably an equivalent mole, per 1 mole of the organic peroxide used.

Examples of the foaming agent used in the present invention include inorganic foaming agents such as sodium hydrogen carbonate, sodium carbonate, ammonium hydrogen carbonate, ammonium carbonate and ammonium nitrite, and N, N'-dimethyl-N, N'-dinitroso. Terephthalamide, nitroso compounds such as N, N'-dinitrosopentamethylenetetramine, azodicarbonamide, azobisisobutyronitrile, azocyclohexylnitrile,
Azodiaminobenzene, barium azodicarboxylate
Azo compounds such as benzene, benzenesulfonyl hydrazide,
Toluenesulfonyl hydrazide, p, p'-oxybis (benzenesulfonyl hydrazide), diphenyl sulfone-3,3 '
Examples thereof include sulfonyl hydrazide compounds such as -disulfonyl hydrazide, azide compounds such as calcium azide, 4,4'-diphenyldisulfonyl azide and p-toluenesulfonyl azide. These foaming agents are rubber 1
It is compounded at a ratio of 1.0 × 10 −3 to 3.0 × 10 −2 mol, preferably 2.0 × 10 −3 to 2.0 × 10 −2 mol, per 100 parts by weight, and generally has an apparent specific gravity of about 0. 0.03 to 0.7
Some foam can be obtained.

As the foaming aid which can be used together with the foaming agent, organic acids such as salicylic acid, phthalic acid and stearic acid, or urea or a derivative thereof are used, and the decomposition temperature of the foaming agent is lowered, decomposition is promoted, Shows functions such as uniformization of bubbles.

As the conductivity-imparting agent, for example, conductive carbon black such as acetylene black or Ketjen black, surface-treated inorganic filler, powder of metal or its oxide, etc. are appropriately used.

Examples of the reinforcing agent for rubber include SRF and G
PF, FEF, MAF, ISAF, SAF, FT, MT
Various carbon blacks such as, and finely divided silicic acid are appropriately used.

As the filler, for example, light calcium carbonate, heavy calcium carbonate, talc, clay and the like are used. These reinforcing agents and fillers are usually used in an amount of 150 parts by weight, preferably 100 parts by weight or less, per 100 parts by weight of the chlorinated ethylene / α-olefin copolymer rubber.

As the softening agent used in the present invention, petroleum-based softening agents such as paraffin-based, naphthene-based, and aroma-based process oils, chlorinated paraffin, and vaseline,
Ester-based softeners such as alcohols, dioctyl phthalate, dibutyl phthalate, dioctyl adipate, dioctyl sebacate, fatty oils such as castor oil and linseed oil, and tole oil, etc. Waxes, fatty acids such as stearic acid, petroleum resins, liquid polybutadiene, and low molecular weight synthetic polymers such as atactic polypropylene are used. These softening agents are generally used in an amount of 100 parts by weight or less, preferably 70 parts by weight or less, per 100 parts by weight of chlorinated ethylene / α-olefin copolymer rubber, and used in a timely manner.

As the metal activator, magnesium oxide, higher fatty acid zinc, red lead, Lissajous, calcium oxide, hydrotalcite and the like can be used. These metal activators are generally used in an amount of 3 to 15 parts by weight, preferably 5 to 10 parts by weight, based on 100 parts by weight of the chlorinated ethylene / α-olefin copolymer rubber.

As the anti-scorch agent, known anti-scorch agents can be used, and examples thereof include maleic anhydride, thioimide compounds, sulfenamide compounds and sulfonamide compounds. The above components are generally used in an amount of 0.2 to 5 parts by weight, preferably 0.3 to 3 parts by weight, based on 100 parts by weight of the chlorinated ethylene / α-olefin copolymer rubber.

As the hydrochloric acid absorbent, oxides and organic acid salts of metals of Group 2A of the Periodic Table are used, and examples thereof include magnesium stearate, magnesia, calcium stearate, manaceite, hydrotalcite, epoxidized soybean oil and epoxy series. Examples thereof include hydrochloric acid absorbents. These hydrochloric acid absorbents can be appropriately added in an amount of usually 10 parts by weight or less with respect to 100 parts by weight of the chlorinated ethylene / α-olefin copolymer rubber.

Further, the foam of the present invention exhibits excellent heat resistance and durability without using an antiaging agent, but the use of the antiaging agent prolongs the material life of the foam of the present invention. It is possible to do the same as in the case of ordinary rubber. Examples of the antiaging agent used in this case include aromatic secondary amines such as phenylbutylamine, N, N'di-2-naphthyl-p-phenylenediamine, dibutylhydroxytoluene, tetrakis [methylene (3,5- A phenolic stabilizer such as di-t-butyl-4-hydroxy) hydrocinnamate] methane, bis [2-methyl-4- (3-n-alkylthiopropionyloxy) -5-t-butylphenyl] sulfide A thioether-based stabilizer such as the above, a dithiocarbamate-based stabilizer such as nickel dibutyldithiocarbamate, and the like are blended alone or in combination of two or more kinds.

The amount of such antiaging agent used is chlorinated ethylene.
The amount is usually 0.1 to 5 parts by weight, preferably 0.5 to 3 parts by weight, based on 100 parts by weight of the α-olefin copolymer rubber.

As the processing aid, those used in the processing of ordinary rubber can be used, and ricinoleic acid, stearic acid, palmitic acid, lauric acid, barium stearate, calcium stearate, zinc stearate, Higher fatty acids, salts and esters thereof, such as esters of the above acids, ethylene glycol, polyethylene glycol
And compounds having an oxyethylene structure such as polypropylene and polypropylene glycol. These processing aids are usually used in an amount of up to about 10 parts by weight, preferably about 1 to 5 parts by weight, based on 100 parts by weight of the chlorinated ethylene / α-olefin copolymer rubber.

Next, the unvulcanized compounded rubber is prepared, for example, by the following method. The chlorinated ethylene / α-olefin copolymer rubber, the filler, and the softening agent are kneaded with a mixer such as a Banbury mixer at a temperature of 80 to 170 ° C. for 3 to 10 minutes, and then mixed with an open roll. A vulcanizing agent and a foaming agent, and if necessary, a vulcanization accelerator, a vulcanization aid or a foaming aid are additionally mixed using various rolls, and the roll temperature is 30 to 30
After kneading at 80 ° C. for 5 to 30 minutes, the mixture is dispensed to prepare a ribbon-shaped or sheet-shaped unvulcanized compounded rubber.

The compounded rubber thus prepared is primarily molded into a roll having a desired shape by an extruder, a calendar roll, a press or the like. At this time, it is necessary to pay attention to the molding temperature, and keep the temperature of the compounded rubber always lower than the decomposition temperature of the foaming agent before molding.

The mandrel or part made of a material such as metal, synthetic resin, rubber, glass or ceramics may be preliminarily mounted or inserted into the primary molded product to form a composite with the compounded rubber. Next, the primary molded product is put into a desired molding die, and the whole mold is placed in a vulcanizing can to foam simultaneously with vulcanization to obtain a sponge rubber roll having a desired shape. In order to improve the surface smoothness of the sponge surface and to facilitate removal of the sponge after vulcanization and foaming when putting the primary molded product into the mold, the mold or the primary molded product or both are treated with a solution of a surfactant. It may be dipped in or applied to. The surfactant is not particularly limited, but cationic surfactants such as quaternary ammonium salts are used. As the solvent, an organic solvent such as alcohol is also preferably used. The concentration of the activator is 1 to 10 wt%, preferably 5 to 8 wt%. There is no limitation on the material of the molding die, such as metal, synthetic resin, glass, ceramic, laminated material, or composite material with fibers, as long as it is not largely deformed by heat during molding or pressure due to foaming. Moreover, the shape and wall thickness of the mold are not particularly limited. However, the material is preferably a metal such as iron or aluminum because it has good thermal conductivity, is ready for cleaning, and can be used repeatedly. The shape of the mold is preferably tubular for the purpose of the present invention. The conditions for vulcanization in a vulcanizer are usually steam at a pressure of 2.0 to 10.0 kg / cm @ 2, a temperature of 100 to 250 DEG C., a time of 1 to 60 minutes, and preferably 2.5 to 8.0 kg / cm @ 2. Pressure (temperature about 1
(30 to 180 ° C.) for 5 to 30 minutes for vulcanization and foaming. After that, secondary vulcanization can be performed if necessary. The conditions for this secondary vulcanization are a temperature of 50 to 1
It is 0.5 to 48 hours at 60 ° C.

[0036]

EFFECTS OF THE INVENTION According to the present invention, a skin layer having excellent shape retention during vulcanization foaming and excellent surface smoothness is provided, and the state of the foam cells is fine and uniform. It is possible to obtain a chlorinated ethylene / α-olefin copolymer rubber sponge rubber roll which does not need to have an easy control of electric resistance and has little variation.

[0037]

EXAMPLES Examples of the present invention will be described below.
The vulcanized rubber sponge was tested by the following method. 1) Apparent specific gravity; JIS K-6301 2) JIS C hardness; JIS K-6301 3) Surface roughness; JIS B-0601 4) Pinhole; Visual judgment using optical microscope (magnification 20) 5) Foaming state; Visual judgment Uniformity: The size and density of the bubbles are uniform. Non-uniformity: The size or density of bubbles or both are not uniform. 6) Variation in electric resistance: The electric resistance value was measured for 20 molded articles by a method according to JIS to obtain an average value and standard deviation (σ). 7) Shape retention: A hollow primary molded product having an outer diameter of 9 mmφ and an inner diameter of 5 mmφ was extrusion-molded, and the final molded product was viewed in terms of width / length ratio. The closer this ratio is to 1, the better the shape retention.

Example 1 A vulcanized rubber sponge was prepared by the following procedure and subjected to a test. First, an unvulcanized compounded rubber having a composition shown in Table 1 is prepared. At the time of compounding, chlorinated ethylene / 1-butene copolymer rubber, magnesia, stearic acid, carbon black and naphthenic oil shown in Table 1 were used for 4 minutes with a 4.3 liter Banbury mixer (manufactured by Kobe Steel). After kneading, 1 at room temperature
I left it on the day. The kneaded material thus obtained was mixed with 14 intio-punroll (front roll / back roll: surface temperature 50).
A foaming agent, a foaming aid, sulfur, and a vulcanization accelerator were added and kneaded at / 50 ° C. and a rotation speed of 16/18 rpm) to obtain a compounded rubber molded into a ribbon shape.

[Table 1] 1) ethylene / 1-butene (molar ratio); 92/8, chlorine content; 27% by weight, ML1 + 4 (121 ° C); 722) p, p'-oxybis (benzenesulfonylhydrazide),
Product name: N1000SW (manufactured by Eiwa Chemical Co., Ltd.) 3) 2-Butylaminotriazine-4,6-dithiole 4) Distearyldimethylammonium chloride Next, this compounded rubber was attached to the head with a mouthpiece having an outer diameter of 9 mmφ. 50mmφ extruder (manufactured by Mitsuba Seisakusho, set temperature; cylinder-rear / cylinder-front / head = 50/60 /
70 ° C) and the screw rotation speed is 5 rpm for 5
A column-shaped unvulcanized compounded rubber was prepared by co-extrusion with a mmφ Teflon mandrel. Next, this columnar compounded rubber was cut into a length of 45 cm, immersed in a solution of distearyldimethylammonium chloride in 8 wt% isopropyl alcohol for 2 minutes, and then the surface was thoroughly dried. Then, it was placed in a stainless steel cylindrical mold having an inner diameter of 13 mmφ and a length of 40 cm, the inside of which was well polished. Put this in a preheated vulcanizer and steam pressure of 6.0 kg / cm2 (temperature about 160 ° C)
Was vulcanized and foamed for 30 minutes. The foam obtained was taken out and the Teflon mandrel was removed while it was hot to obtain a hollow vulcanized rubber sponge. After leaving this sponge at 25 ° C. for 1 day, physical properties were measured. The measurement results are shown in Table 3.

Comparative Example 1 In Example 1, coextruded with a Teflon mandrel and immersed in a solution of distearyldimethylammonium chloride of 8 wt% isopropyl alcohol for 1 minute, and then a columnar unvulcanized rubber was HAV-added. The procedure of Example 1 was repeated, except that the vulcanization and foaming was performed at 180 ° C. for 10 minutes by introducing the mixture into a vulcanizing tank. The measurement results are shown in Table 3.

COMPARATIVE EXAMPLE 2 In Example 1, coextruded with a Teflon mandrel and immersed in an 8 wt% isopropyl alcohol solution of distearyldimethylammonium chloride for 1 minute, and then a cylindrical unvulcanized rubber compound was added to the PCM. The procedure of Example 1 was repeated, except that the vulcanization foaming was carried out at 170 ° C. for 10 minutes. The measurement results are shown in Table 3.

Comparative Example 3 First, an unvulcanized compounded rubber having the composition shown in Table 2 is prepared. At the time of compounding, the EPDM rubber, zinc white, stearic acid, acetylene bratsk, and naphthenic oil shown in Table 2 and 4.3 liter Banbury mixer (manufactured by Kobe Steel)
After kneading for 4 minutes, the mixture was left at room temperature for 1 day. The thus obtained kneaded product was mixed with 14 inthio-punroll (front roll / back roll: surface temperature 50/60 ° C., rotation speed 16/18 rpm), a foaming agent, a foaming aid, sulfur, A vulcanization accelerator was added and kneaded to obtain a ribbon-shaped unvulcanized compounded rubber. After that, the same procedure as in Example 1 was performed. The measurement results are shown in Table 3.

[Table 2] 1) ethylene / propylene (molar ratio): 66/34, diene component: ENB iodine value: 22, ML1 + 4 (100 ° C.): 60, 20 parts oil extended product 2) p, p'-oxybis (benzenesulfonylhydrazide, Product name: N1000SW (manufactured by Eiwa Chemical Co., Ltd.) 3) 2-mercaptobenzothiazole 4) Zinc dimethyldithiocarbamate 5) Zinc dibutyldithiocarbamate 6) Tellurium dimethyldithiocarbamate

[0042]

[Table 3]

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[Procedure amendment]

[Submission date] June 20, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

[0003]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above problems, and a sponge rubber roll that does not require a post-processing step can be formed in one step, and there is little variation in electric resistance and easy control. Another object of the present invention is to provide a sponge rubber roll made of chlorinated ethylene / α-olefin copolymer rubber. The above problem was found to be solved by using a specific chlorinated ethylene / α-olefin copolymer rubber in a sponge manufacturing method that also uses vulcanization, and putting an unvulcanized compounded rubber into a molding die to solve the present invention. completed.

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location B29K 105: 04 B29L 31:32 4F C08L 23:00

Claims (3)

[Claims] 1. A chlorine content of 20-40% by weight,
Two-viscosity [ML1 + 4 (121 ° C)] 10-190 chlorinated ethylene / α-olefin copolymer rubber unvulcanized compounded rubber is put into a mold and vulcanized using a vulcanizer. ,
Sponge rubber roll made of foamed molded product. 2. The α-olefin of the ethylene / α-olefin copolymer before chlorination of the chlorinated ethylene / α-olefin copolymer rubber has 3 to 10 carbon atoms, and the copolymer of ethylene and α-olefin is The sponge rubber roll according to claim 1, wherein the polymerization molar ratio is 75/25 to 95/5. 3. An α-olefin of the chlorinated ethylene / α-olefin copolymer rubber is 1-butene.
The sponge rubber roll described.