Abstract: A rubber composition containing no reinforcing agent, which comprises (A) 55 to 95 parts by weight of an ethylene-?-olefin-non-conjugated diene copolymer rubber, (B) 5 to 45 parts by weight of a natural rubber, and (C) 0.1 to 15 parts by weight of an organic peroxide, wherein the total amount of the components (A) and (B) is 100 parts by weight; a process for producing a rubber composition comprising the steps of (1) kneading at least said components (A) and (B), and (2) mixing at least the kneaded product with said component (C); a process for producing a molded article containing a vulcanized rubber composition, which comprises the above kneading step (1), the above mixing step (2), and the step (3) of molding the rubber composition at elevated temperature; and a vibration-proof material which comprises a molded article containing a vulcanized rubber composition produced according to the above-mentioned process.

Abstract: There are provided: (i) a process for producing a foamed rubber having a density of less than 0.50 g/cm3, which comprises the step of foaming and cross-linking a rubber composition containing (i) an ethylene-&agr;-olefin copolymer rubber, (ii) a vulcanizing agent and (iii) a foaming agent having a particle diameter of not more than 10 &mgr;m in terms of a median diameter, wherein an amount of the foaming agent exceeds 4.0 parts by weight per 100 parts by weight of the ethylene-&agr;-olefin copolymer rubber, and (ii) a sealing material for car use, which comprises the foamed rubber obtained by the above-mentioned process for producing a foamed rubber.

Abstract: There is provided vulcanized solid rubber, which comprises a vulcanized product of an oil-extended copolymer comprising: (i) 100 parts by weight of an ethylene-&agr;-olefin-non-conjugated diene copolymer satisfying the following requirements (1) to (4), and (ii) 10 to 90 parts by weight of an extender oil: (1) a weight ratio of an ethylene unit to an &agr;-olefin unit in the ethylene-&agr;-olefin-non-conjugated diene copolymer is from 73/27 to 40/60, (2) an iodine value of the ethylene-&agr;-olefin-non-conjugated diene copolymer is from 20 to 36, (3) Mooney viscosity (ML1+4 (121° C.)) measured according to JIS-K-6300 of a blend containing 100 parts by weight of the ethylene-&agr;-olefin-non-conjugated diene copolymer and 20 parts by weight of an extender oil is from 100 to 180, and (4) a ratio of weight average molecular chain length/number average molecular chain length measured by gel permeation chromatography of the ethylene-&agr;-olefin-non-conjugated diene copolymer is from 3 to 5.

Abstract: There is provided vulcanized solid rubber, which comprises a vulcanized product of an oil-extended copolymer comprising:

Abstract: There are provided:

Abstract: An oil-extended copolymer for sponge comprising an ethylene-&agr;-olefin nonconjugated diene copolymer satisfying the following conditions (1) to (4), and an extender oil in an amount of 10 to 90 parts by weight based on 100 parts by weight of said copolymer. (1) a weight ratio of ethylene/&agr;-olefin of 73/27 to 40/60, (2) an iodine value of 20 to 36 which represents a non-conjugated diene content, (3) a Mooney viscosity (ML 1+4 (121° C.) in Mooney viscosity according to JIS-K-6300) of 100 to 180 as measured for a mixture formed by compounding 20 parts by weight of an extender oil based on 100 parts by weight of said copolymer, and (4) a Q-value (a weight average of molecular chain/number average of molecular chain) of 3 to 5 as measured by gel-permeation chromatography (GPC) of said copolymer.

Abstract: A foamed rubber obtainable by a process including the steps of:

Abstract: Herein is disclosed a vulcanizable rubber composition comprising a copolymer rubber constituted of ethylene, propylene and nonconjugated polyene, wherein ethylene/propylene molar ratio is 78/22 to 97/3 and the total content of propylene and nonconjugated polyene is 6 to 30% by mole in said copolymer rubber. By the use of the rubber composition of the present invention, a vulcanized product excellent in tensile strength, heat resistance, oil resistance, compression set resistance and flex behavior can be obtained. The vulcanized product can be used as automobile parts and other innumerable articles such as socket cover, heat resistant hose, electric wire, condenser cap, heat resistant belt, vibration-proof rubber, hoses, weather strip, seal sponge, black side wall of tire, etc.

Abstract: Herein is disclosed a vulcanizable rubber composition comprising a copolymer rubber constituted of ethylene, propylene and nonconjugated polyene, wherein ethylene/propylene molar ratio is 78/22 to 97/3 and the total content of propylene and nonconjugated polyene is 6 to 30% by mole in said copolymer rubber. By the use of the rubber composition of the present invention, a vulcanized product excellent in tensile strength, heat resistance, oil resistance, compression set resistance and flex behavior can be obtained. The vulcanized product can be used as automobile parts and other innumerable articles such as socket cover, heat resistant hose, electric wire, condenser cap, heat resistant belt, vibration-proof rubber, hoses weather strip, seal sponge, black side wall of tire, etc.

Abstract: A rubber composition is disclosed, comprising (a) 100 parts by weight of a synthetic rubber and (b) from 0.5 to 10 parts by weight of an alkylene oxide adduct of a saponified ethylene-saturated carboxylic acid vinyl ester copolymer. The rubbber composition can provide a vulcanized rubber composition which can retain its excellent appearance over a prolonged period of time because of freedom from blooming, has excellent antistatic performance due to its electrical conductivity, can be colored in various tints including white, and also has excellent properties in terms of tensile strength and specific gravity.

Abstract: Continuous casting process for the production of hollow ingot using an improved direct chill casting equipment having a molding system comprising a hollow mold and a movable platform, wherein at least one core and a pipe for introducing outer air are provided, said core being made from a refractory material unwettable with a molten metal and having a convergent taper at the side and an air runner for introducing outer air, which is packed with an air-permeable material, at the bottom, and said pipe for introducing outer air extending upwards from the air runner and passing through the core.