Mitsui Petrochemical Industries, Ltd.

Akira Matsuda

Akira Uchiyama

Katsuyoshi Yonekura

Tetsuo Tojo

Shunji Abe

Shizuo Shimizu

Katsuo Okamoto

Hidekuni Oda

Kazuo Iwata

Yohzoh Yamamoto

Syuji Minami

Yasuhiko Otawa

Hiroshi Inoue

Kazuhiko Murata

Hirokazu Kajiura

Tetsuo Tojyo

Eckhart Louis

Disclosed is a heat-resistant rubber composition comprising (A) 100 parts by weight of an ethylene/.alpha.-olefin copolymer or a modified ethylene/.alpha.-olefin copolymer formed by graft-copolymerization with at least one compound selected from the group consisting of unsaturated carboxylic acids and anhydrides and esters thereof, and (B) (i) 10 to 100 parts by weight of a silica type filler which has been treated with a silane compound represented by the following formula: ##STR1## wherein R.sup.1 stands for an alkenyl group, a chloroalkenyl group or a chloroalkyl group, and R.sup.2 stands for a lower alkyl group, or (ii) a combination of 10 to 100 parts by weight of said silane-treated silica type filler or an untreated silica type filler and 0.5 to 30 parts by weight of a polyorganosiloxane having an average composition represented by the following formula:

Heat-resistant rubber compositions

Disclosed is a thermoplastic elastomer composition excellent in the injection fusion bondability and the surface gloss, which comprises (1) an amorphous ethylene/.alpha.-olefin copolymer (a) and (2) (i) a lowly crystalline copolymer (b) of propylene with an .alpha.-olefin having at least 4 carbon atoms, (ii) a polymer (d) composed mainly of 1-butene or (iii) a combination of the copolymer (b) or the polymer (d) with a crystalline polymer (c) composed mainly of propylene, wherein the component (l) is present in an amount of 10 to 95% by weight based on the total amount of the components (1) and (2), the component (2) is present in an amount of 5 to 90% by weight based on the total amount of the components (1) and (2), and the component (1) or the components (1) and (2) are partially crosslinked. The partial crosslinking is effected by grafting of a radical-polymerizable monomer having at least two polymerizable groups.

Thermoplastic elastomer composition and process for preparation thereof

Disclosed is a thermoplastic elastomer composition excellent in the injection fusion bondability and the surface gloss, which comprises (1) an amorphous ethylene/.alpha.-olefin copolymer (a) and (2) (i) a lowly crystalline copolymer (b) of propylene with an .alpha.-olefin having at least 4 carbon atoms, (ii) a polymer (d) composed mainly of 1-butene or (iii) a combination of the copolymer (b) or the polymer (d) with a crystalline polymer (c) composed mainly of propylene, wherein the component (1) is present in an amount of 10 to 95% by weight based on the total amount of the components (1) and (2), the component (2) is present in an amount of 5 to 90% by weight based on the total amount of the components (1) and (2), and the component (1) or the components (1) and (2) are partially crosslinked. The partial crosslinking is effected by grafting of a radical-polymerizable monomer having at least two polymerizable groups.

Fine particulate crosslinked amorphous copolymer and preparation and use

Disclosed is a laminate excellent in the surface gloss and scratch resistance, which comprises a thermoplastic elastomer layer composed mainly of a composition comprising a polyolefin and an olefinic copolymer elastomer, at least one of which is partially crosslinked, and a layer of a partially neutralized ionomer resin or 1-olefin/(meth)acrylic acid copolymer resin having a free carboxyl group, both the layers being tightly bonded to each other.

Laminate excellent in surface gloss and surface hardness, and

A thermoplastic elastomer composition composed of a partially crosslinked product of a blend consisting mainly of (a) 80 to 10 parts by weight of a peroxide-crosslinkable olefinic copolymer rubber, (b) 10 to 80 parts by weight of a peroxide-crosslinkable polyolefin resin having specific properties and (c) 50 to 10 parts by weight of a peroxide-decomposable polyolefin resin, the total amount of (a)+(b)+(c) being 100 parts by weight, the crosslinked product is obtained by dynamically heat-treating said blend in the presence of (d) an organic peroxide. The thermoplastic elastomer has excellent film formability, and is useful as a waterproof sheet.

Thermoplastic elastomer composition

Disclosed is a laminate excellent is surface gloss and scratch resistance, which comprises a thermoplastic elastomer layer composed mainly of a copolymer elastomer, at least one of which is partially crosslinked, and a layer of a partially neutralized ionomer resin or 1-olefin/(meth)acrylic acid copolymer resin having a free carboxyl group, both the layers being tightly bonded to each other.

Laminate excellent in surface gloss and surface harness, and preparation

A rubbery copolymer of ethylene, 1-butene and a polyene, characterized by having (A) an ethylene/1-butene mole ratio of from 86/14 to 95/5, (B) an iodine value of from 2 to 40, (C) an intrinsic viscosity [.eta.], measured in decalin at 135.degree. C., of from 0.8 to 4 dl/g, and (D) a weight average molecular weight/number average molecular weight ratio (Mw/Mn) of less than 3; and a process for the production thereof.

Process for production of rubbery ethylene/1-butene/polyene copolymers

An ethylene-alpha-olefin-polyene random copolymer rubber comprising ethylene, an alpha-olefin having 3 to 10 carbon atoms and a polyene, wherein (A) a molar ratio of ethylene/alpha-olefin is 55/45 to 95/5, (B) the polyene is a mixture of 5-ethylidene-2-norbornene (ENB) and 5-vinyl-2-norbornene (VNB) in a molar ratio of ENB/VNB of 1/1 to 20/1, (C) an iodine value of the copolymer rubber is 2 to 40, (D) an intrinsic viscosity [.eta.] of the copolymer rubber is 1.0 to 6.0 dl/g measured in decalin at 135.degree. C., and (E) g.sub..eta. * defined by a ratio of the intrinsic viscosity [.eta.] to an intrinsic viscosity [.eta.]l of a linear ethylene-propylene random copolymer having an ethylene content of 70 mole % and the same weight-average molecular weight determined by a light-scattering method as that of the copolymer rubber is 0.2 to 0.9. Also a process for preparing this random copolymer rubber and vulcanizate derived from the same are also disclosed. This random copolymer rubber has an excellent extrudability and a fast cure rate and provides a vulcanizate having high tensile strength.

Ethylene-alpha-olefin-polyene random copolymer rubber

A method of producing partially crosslinked rubber-resin composition comprising directly feeding a pelletized peroxide-curable olefin copolymer composition, a peroxide-decomposing polyolefin resin and an organic peroxide compound to a twin-screw extruder under specific extruding conditions of weight of the copolymer rubber and specific energy at extrusion.

Method of producing partially crosslinked rubber-resin composition

A chlorinated rubber having a chlorine content of about 5 through about 50% by weight and a Mooney viscosity (ML.sub.1+4 at 100.degree. C.) of about 20 through about 150 is presented. This chlorinated rubber is derived from the chlorination of (i) a copolymer rubber of ethylene and 1-butene having a mol ratio of ethylene/1-butene of about 85/15 through about 95/5 or (ii) a copolymer rubber of ethylene 1-butene and 5-ethylidene-2-norbornene having a mol ratio of ethylene/1-butene of about 85/15 through about 95/5 and a content of the 5-ethylidene-2-norbornene of 20% by weight or less based on the weight of the copolymer. The incorporation of the chlorinated rubber into a polyvinyl chloride composition results in the remarkable improvement of the impact resistance and flexibility, both at a low temperature, of the polyvinyl chloride.

Chlorinated rubber and polyvinyl chloride composition containing the same

Dynamically partially cured composition comprising a peroxide-curable olefin copolymer rubber (such as EDPM) and a peroxide-decomposing olefin plastic (such as PE and PP) is improved by effecting the dynamic heat-treatment with addition of a peroxide-non-curable hydrocarbon rubber (such as PIB) and/or a mineral oil softener (process oil). The dynamic heat-treatment is preferably carried out not only in the presence of an organic peroxide but also in the presence of divinyl benzene. The elastomeric composition is thermoplastic and, with or without further blending with an olefin plastic, is processable by techniques conventionally used for thermoplastic resins. This elastomer composition and blends of the elastomer composition and olefin plastic can be used for producing foamed product in combination with decomposition type foaming agent (such as azodicarbonamide).

Thermoplastic elastomer blends with olefin plastic, and foamed products

Thermoplastic elastomer composition, blends of the composition with

A thermoplastic olefin resin composition composed of a blend of

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Ichihara, Japan

Akira Matsuda