Abstract: Disclosed herein is an automotive molding, which is excellent in scratching resistance, has high gloss and moreover is excellent in weathering resistance. The automotive molding of the invention has a part composed of an elastomer material containing an olefinic random copolymer obtained by copolymerizing ethylene, an ?-olefin having 3 to 10 carbon atoms and an unsaturated monomer having a functional group, and optionally a non-conjugated diene, and a metal ion for crosslinking the olefinic random copolymer.

Abstract: A thermoplastic elastomer composition of the invention, formed by dynamically crosslinking a polymer composition including a rubber and an olefinic resin and having an average particle size of rubber particles within a specific range, shows an excellent balance of mechanical properties such as flexibility and elastic recovery, and a moldability. Also an inclusion of a (meth)acrylate resin and a hydrogenated diene polymer provides a composition particularly excellent in scratch resistance. Also an inclusion of a maleimide compound provides a composition particularly excellent in injection fusibility. Also an inclusion of an undenatured organopolysiloxane of a specific viscosity and a denatured organopolysiloxane provides a composition particularly excellent in initial slidability and durable slidability.

Abstract: The thermoplastic elastomer composition of the present invention comprises a thermoplastic elastomer which includes an ethylene•?-olefin copolymer and a crystalline polyethylene resin, wherein the crystalline polyethylene resin constitutes a three-dimensional network structure in a matrix formed by the ethylene•?-olefin copolymer, an organic or inorganic blowing agent and a nucleating agent, wherein the thermoplastic elastomer has a melt flow rate of 5 g/10 min or more at a temperature of 230° C. and a load of 10 kg, and a melt tension of 3.0 gf or more at a temperature of 210° C. and a pulling rate of 2 m/min. Also the foam injection molding method of the present invention is a method comprising of injecting the above-mentioned composition into a cavity space of a metal mold and then expanding the cavity space to foam by opening the metal mold at a mold opening rate of 0.05 to 0.4 mm/sec.

Abstract: The present invention relates to a thermoplastic elastomer composition having a three-dimensional network structure which is not formed by a chemical crosslinking and having an excellent elasticity recovery and flexibility, a foam having a highly closed cell, an uniform cell shape, an excellent elasticity recovery, flexibility and appearance, and a process for producing the same. A thermoplastic elastomer of the invention is obtained by mixing in a predetermined ratio an EPDM (1), a crystalline polyethylenic resin (2) and a block copolymer (3) having a crystalline ethylenic polymeric block and a block which is more compatible with said EPDM than with said crystalline polyethylenic resin together with an anti-aging agent followed by kneading in a pressurized kneader. A foam of the invention is obtained by adding 1 part by mass of a wetting agent to 100 parts by mass of the thermoplastic elastomer composition described above together with a foaming agent, agitating and then performing an extrusion foaming.

Abstract: The thermoplastic elastomer composition in the present invention comprises an ethylene.&agr;-olefinic copolymeric rubber (A) whose intrinsic viscosity [&eegr;] determined at 135° C. in decalin solvent is 3.5 to 6.8 dl/g, a mineral oil-based softener (B), an &agr;-olefinic crystalline polymer (C) whose degree of crystallinity is 50% or higher and an &agr;-olefinic amorphous polymer (D) whose melt viscosity at 190° C. is 50,000 cPs or less and whose degree of crystallinity is less than 50%, and at least a part of a mixture containing 20 to 63% by mass of the (A), 35 to 78% by mass of the (B), 1 to 12% by mass of the (C) and 1 to 12% by mass of the (D), based on 100% by mass of the total of the components (A), (B), (C) and (D), is crosslinked.

Abstract: An olefin thermoplastic elastomer containing an olefin random copolymer formed by copolymerizing ethylene, an &agr;-olefin having 3 to 10 carbon atoms and an unsaturated monomer having a functional group, and optionally a non-conjugated diene, and metal ions crosslinking the olefin random copolymer, has the same or similar rubber elasticity, flexibility and molding and processability as the conventional olefin thermoplastic elastomers, and has good mechanical properties, wear resistance, in particular scratch resistance.

Abstract: Objects of the present invention are to provide a method for molding polymers to be able to mold products each of which has an outer shape transferred accurately from the shape of the inside of a mold, exhibits high dimensional accuracy and is uniform in the thickness of its surface skin layer and the expansion ratio in its foamed inside.

Abstract: Disclosed herein are an olefin thermoplastic elastomer having the same or similar rubber elasticity, flexibility and molding and processability as those of the conventional olefin thermoplastic elastomers, and are good in mechanical properties and wear resistance and excellent in scratch resistance in particular and a production process thereof, a composition containing the olefin thermoplastic elastomer and a production process thereof, and molded products thereof.

Abstract: The thermoplastic elastomer composition in the present invention comprises an ethylene.&agr;-olefinic copolymeric rubber (A) whose intrinsic viscosity [&eegr;] determined at 135° C. in decalin solvent is 3.5 to 6.8 dl/g, a mineral oil-based softener (B), an &agr;-olefinic crystalline polymer (C) whose degree of crystallinity is 50% or higher and an &agr;-olefinic amorphous polymer (D) whose melt viscosity at 190° C. is 50,000 cPs or less and whose degree of crystallinity is less than 50%, and at least a part of a mixture containing 20 to 63% by mass of the (A), 35 to 78% by mass of the (B), 1 to 12% by mass of the (C) and 1 to 12% by mass of the (D), based on 100% by mass of the total of the components (A), (B), (C) and (D), is crosslinked.

Abstract: The present invention relates to a thermoplastic elastomer composition having a three-dimensional network structure which is not formed by a chemical crosslinking and having an excellent elasticity recovery and flexibility, a foam having a highly closed cell, an uniform cell shape, an excellent elasticity recovery, flexibility and appearance, and a process for producing the same. A thermoplastic elastomer of the invention is obtained by mixing in a predetermined ratio an EPDM (1), a crystalline polyethylenic resin (2) and a block copolymer (3) having a crystalline ethylenic polymeric block and a block which is more compatible with said EPDM than with said crystalline polyethylenic resin together with an anti-aging agent followed by kneading in a pressurized kneader. A foam of the invention is obtained by adding 1 part by mass of a wetting agent to 100 parts by mass of the thermoplastic elastomer composition described above together with a foaming agent, agitating and then performing an extrusion foaming.

Abstract: An ethylene copolymer rubber composition which comprises an ethylene copolymer rubber and at least one member selected from the group consisting of a vulcanizing agent and a cross-linking agent and optionally a conjugated diene rubber, said ethylene copolymer rubber being composed of ethylene, an .alpha.-olefin having 3 to 12 carbon atoms, a non-conjugated diene represented by the following structural formula (I): ##STR1## wherein R.sup.1 and R.sup.2 represent independently hydrogen atoms or alkyl groups having 1 to 8 carbon atoms, R.sup.3 represents an alkyl group having 1 to 8 carbon atoms, and n is an integer of 2 to 10, and an .alpha.,.omega.-diene represented by the following structural formula (II) :CH.sub.2 .dbd.CH--(CH.sub.2).sub.m --CH.dbd.CH.sub.

Abstract: An ethylene-.alpha.-olefin-non-conjugated diene copolymer rubber composition which comprises two kinds of ethylene-.alpha.-olefin-non-conjugated diene copolymers, ?the copolymers (A) and (B)!, copolymer (A) containing ethylidenenorbornene and either dicyclopentadiene or .alpha.,.omega.-diene having 8 to 20 carbon atoms in the main chain as the non-conjugated dienes, copolymer (B) containing ethylidenenorbornene as the non-conjugated diene, the weight ratio of the copolymer (A) to the copolymer (B) being 30/70 to 70/30, wherein the copolymer (A) has a relatively low molecular weight, a specific ethylene/.alpha.-olefin weight ratio and a specific non-conjugated diene content and the copolymer (B) has a relatively high molecular weight and a specific ethylene/.alpha.-olefin weight ratio. Said copolymer rubber composition, when highly foamed, shows no reduction particularly in low tensile stress, and is excellent in shape-retention during cross-linking and foaming, and in compression set and processibility.

Abstract: An ethylene-.alpha.-olefin-non-conjugated diene copolymer rubber composition comprising a low molecular weight component copolymer composed of an ethylene-.alpha.-olefin-non-conjugated diene copolymer having a Mooney viscosity (ML.sub.1+4, 100.degree. C.) of 10 to 150, an .alpha.-olefin content of 30 to 60% by weight and an iodine value of 37 to 65, and a high molecular weight component copolymer composed of an ethylene-.alpha.-olefin-non-conjugated diene copolymer having a Mooney viscosity (ML.sub.1+4, 100.degree. C.) of 100 to 500, an .alpha.-olefin content of 15 to 50% by weight and an iodine value of 3 to 15, the ratio of the iodine value of the low molecular weight component copolymer to the iodine value of the high molecular weight component copolymer being at least 4/1. The above composition can inhibit a gel from being produced during processing and achieve a high degree of cross-linking and is excellent in compression set, shape-retention and sponge surface skin.

Abstract: A high-permeability core has four legs of a quadrangular prism shape. An exciting coil has a first winding that is wound on two adjacent legs of the core, and a second winding connected to the first winding and wound on the other two adjacent legs in the direction opposite to the winding direction of the first winding. A detecting coil has a structure similar to that of the exciting coil, and oriented orthogonally thereto. The sensor is disposed adjacent to a rotary shaft such that a long side of each winding of the exciting coil is parallel to the axial direction of the rotary shaft. The core is-produced by forming a cruciform groove in a rectangular parallelepiped core block from one face.

Abstract: A thermoplastic elastomer composition comprising (a) 20 to 70 parts by weight of a polyamide and (b) 80 to 30 parts by weight of a butyl rubber modified with a functional-group-containing compound having at least one group selected from a carboxyl group, an acid anhydride group and an epoxy group as the functional group, the total amount of the (a) and (b) components being 100 parts by weight. The thermoplastic elastomer composition is resistant to permeation of FREON gases containing hydrogen atom in their molecules and has excellent flexibility, low-temperature resistance and oil resistance.

Abstract: A rubber composition is disclosed which contains not less than 20% by weight in a rubber component of a block copolymer composed of polymer or copolymer block units (A) and a random copolymer block units (B). The polymer or copolymer block units (A) are obtained by singly polymerizing a conjugated diolefine or copolymerizing the conjugated diolefine and a monovinyl aromatic hydrocarbon with use of a lithium initiator and contains not more than 10% by weight of the bound monovinyl aromatic hydrocarbon. The random copolymer block unit (B) are obtained by copolymerizing the conjugated diolefine and the monovinyl aromatic hydrocarbon and contain 15 to 80% by weight of the bound monovinyl aromatic hydrocarbon.

Abstract: A conjugated diene series rubber composition comprises, as a rubber component, (a) 20.about.100% by weight of a particular conjugated diene polymer and (b) a diene polymer rubber except for the polymer (a) and is excellent in the processability at unvulcanized state and the rebound resilience, strengths at rupture and wear resistance at vulcanized state.