Abstract: The present invention provides a composition for sponge rubber including 2 to 6 parts by mass of polyethylene, 0.5 to 12 parts by mass of baking soda as a foaming agent, and a sulfur vulcanizing agent with respect to 100 parts by mass of an ethylene-?olefin-nonconjugated diene copolymer.

Abstract: A method of molding a rubber product from a rubber compound by a molding apparatus having a kneading region. A full amount of carbon black (CB) and a full amount of process oil, together with other auxiliary materials except vulcanizing chemicals, are compounded with raw rubber to thereby knead and prepare a granular master batch (granular MB) . The rubber product is extrusion-molded and vulcanized after vulcanizing chemicals (a vulcanizing agent and a vulcanization accelerator) are quantitatively supplied into the kneading region of the molding apparatus through a material supply port while the vulcanizing chemicals are mixed with the granular MB.

Abstract: A two-axis continuous kneader 1 kneads a raw rubber, a reinforcing agent such as a carbon black, a softener such as a process oil, and the like by a screw, and at the same time sends them out in the front end direction and to the pelletizing/pellet delivery device 3. The pelletizing/pellet delivery device 3 manufactures the rubber pellet to be pressure-supplied to the extrusion molding device 15 through the conduit4. The extrusion molding device 15 kneads the rubber pellet supplied to the hopper 18 and the additive such as the vulcanized agent supplied to the hopper 19 by the screw to extrude the rubber pellet for a desired product.

Abstract: The present invention provides a foam rubber extrusion molded article capable of increasing its expansion ratio and meeting the need for less weight while keeping necessary rigidity. The foam rubber extrusion molded article includes the extrusion molded article resulting from extrusion molding of a foam rubber blend, and innumerable air bubbles present in the extrusion molded article by bubble generation are an approximate ellipsoid shape stretched in the extrusion direction. A stretching ratio of air bubbles which is the ratio of air bubble length in the extrusion direction to air bubble length in the direction perpendicular to the extrusion is 1.1 or more.

Abstract: The invention is to provide an extruded product of a foamed rubber satisfying requisite features as to the abrasion resistance or the surface skin in the glass run, while maintaining the foaming magnification enabling to reply the demands of the weight lightening. An ethylene-&agr;-olefin based rubber is substantially a raw rubber, and is extruded from a compounded material of the foamed rubber prepared (vulcanized material) with a thermal decomposition typed foaming agent. This extruded product of the foamed rubber has physical properties of foaming magnification: 1.05 to 1.55, bubble diameter: 110 &mgr;m or less, and thickness of skin layer: 130 &mgr;m or more.

Abstract: A method of molding a rubber product from a rubber compound by a molding apparatus having a kneading region. A full amount of carbon black (CB) and a full amount of process oil, together with other auxiliary materials except vulcanizing chemicals, are compounded with raw rubber to thereby knead and prepare a granular master batch (granular MB) . The rubber product is extrusion-molded and vulcanized after vulcanizing chemicals (a vulcanizing agent and a vulcanization accelerator) are quantitatively supplied into the kneading region of the molding apparatus through a material supply port while the vulcanizing chemicals are mixed with the granular MB.

Abstract: An extruded product comprising an ethylene-&agr;-olefin-nonconjugated diene copolymer rubber in which a weight ratio of ethylene unit content and &agr;-olefin unit content is 64/36-58/42, and a content of the nonconjugated diene unit is 12-16% by weight (the total weight of the ethylene unit, the &agr;-olefin unit and the non-conjugated diene unit being 100% by weight), and a Mooney viscosity (ML1+4 100° C.) is 85-100. This extruded article is excellent in compressive permanent strain and elongation, causes no blooming and can be filled with carbon black, plasicizers and the like at high rates.

Abstract: A kneaded rubber for expandable formulation, such as a material for die forming. The polymer components in the kneaded rubber principally comprise a polymer alloy, further comprising a sea phase of a ethylene/&agr;-olefin/non-olefin/non-conjugated polyene terpolymer rubber and an island phase of a polyolefin resin. The polyolefin resin wholly or largely comprises a monomer C4-C6 &agr;-olefin and has an MFR of at least 15 g/10 min at 190° C. under a load of 2.196 kgf according to ASTMD 1238. The kneaded rubber satisfies the following Mooney viscosity profile formula according to JIS K 6300: (ML1+480° C.)−(ML1+4160° C.)≧15.

Abstract: A formed rubber extruded product which is formed of a vulcanizate of a rubber blend comprising a sulfur-vulcanizable ethylene-propylene-type rubber (EPDM) as a starting rubber and a pyrolytic foaming agent. The vulcanizate has a specific gravity of from 0.9 to 1.0 and a surface roughness (RZD) of 14 micrometers or less. The rubber blend contains the pyrolytic foaming agent in the form of an inorganic powder-supported foaming agent. A particle diameter of the inorganic powder in the inorganic powder-supported foaming agent is approximately 9 micrometers or less, and a particle diameter of the pyrolytic foaming agent is approximately 8 micrometers or less. Further, crystalline PE is contained in an amount of from 6 to 30 parts per 100 parts of EPDM. The foamed rubber extruded product of the present invention can be produced by the extrusion at a high rate.

Abstract: A foam rubber composition and a method for making same which is foamable to a high degree and a molded product made from the foam rubber composition wherein the compositions has: (A) a low-molecular Ethylene-propylene-5-ethylidene-2-norbornene terpolymer having a Mooney viscosity (ML.sub.1+4 at 100.degree. C.) of 20 to 40, an ethylene/propylene ratio by weight of 65/35 to 50/50, an iodine value of 20 to 30, and a Q value (Mw/Mn) not exceeding 3 as determined by gel permeation chromatography; (B) a high-molecular ethylene-propylene-5-ethylidene-2-norbornene terpolymer having a Mooney viscosity (ML.sub.1+4 at 100.degree. C.) of 100 to 300, an ethylene/propylene ratio by weight of 65/35 to 50/50, an iodine value of 20 to 30 and a Q value (Mw/Mn) of 6 to 10; (C) a vulcanizing system agent containing sulfur as a vulcanizer, and zinc carbamate and sulfenamide as accelerators; and (D) a foaming agent containing N, N'-dinitrosopentamethylenetetramine and urea.

Abstract: A foamed rubber blend comprising an EPDM is polymer blend comprising at least one high molecular weight component and at least one low molecular weight component is provided. The high molecular weight component has a weight average molecular weight (Mw) in a range of from about 400,000 to about 800,000 and a molecular weight distribution index (Mw/Mn) in a range of from about 5.5 to about 9.5. The low molecular weight component has a weight average molecular weight (Mw) in a range of from about 150,000 to about 500,000 and a molecular weight distribution index (Mw/Mn) in a range of from about 1.5 to about 5.5. The EPDM rubber has an overall weight average molecular weight (Mw) in a range of from about 200,000 to about 700,000. The ratio of the polymer blend in the foamed rubber blend is in a range of from about 33 wt % to about 60 wt %.

Abstract: A multi-layer rubber hose in which a fluorinated rubber (FKM) layer and a nitrile rubber (NBR) layer adjacent thereto have been vulcanization-adhered to each other. The FKM layer is formed from the vulcanizate of an FKM compound containing a ternary FKM as a polymer component. The vulcanization system is an organic polyol system and a quaternary ammonium salt, and the vulcanization induction time (T.sub.10) satisfies the following equation, 4 minutes .ltoreq.T.sub.10 +determined vulcanization temperature -170.degree. C.) minutes/10.degree. C..ltoreq.7 minutes. The NBR layer is formed from the vulcanizate of the NBR compound, and the NBR comound is a stock rubber into which a functional group having an active hydrogen has been introduced. The vulcanization system is an oragnic peroxide system. The multi-layer rubber hose of the presnt invention is suitable as a fuel hose for cars and has a high resistance to gasohol.

Abstract: A curable elastomeric composition comprising an epoxy group-containing acrylate-type elastomer in combination with (1) a polycarboxylic acid or its anhydride, (2) a quaternary ammonium or phosphonium salt and (3) a urea.

Abstract: An acrylic rubber composition comprising (A) a copolymer and (B) a crosslinking agent, said copolymer (A) consisting essentially of (a) from 3 to 10% by weight of ethylene, (b) from 0 to 10% by weight of at least one crosslinkable monomer selected from the group consisting of monomers of the formulas (1), (2), (3) and (4): ##STR1## wherein R.sub.1 is hydrogen or methyl, ##STR2## wherein R.sub.2 is vinyl, allyl or methallyl, ##STR3## wherein R.sub.3 is hydrogen or methyl,R.sub.4 OOC--CH.dbd.CH--COOH (4)wherein R.sub.4 is methyl, ethyl, propyl, butyl, methoxymethyl, methoxyethyl, methoxypropyl, methoxybutyl, ethoxybutyl, ethoxyethyl, ethoxypropyl or ethoxybutyl, and (c) from 80 to 97% by weight of other copolymer component, said other copolymer component (c) consisting essentially of (i) from 0 to 10% by weight of vinyl acetate, (ii) from 20 to 45% by weight of ethyl acrylate and (iii) from 45 to 70% by weight of n-butyl acrylate, the total amount of constituents (i), (ii) and (iii) being 100% by weight.