Mitsui Chemicals, Inc.

Mitsui Petrochemical Industries, Ltd.

Toyoda Gosei Co., Ltd.

Kojima Press Industry Co., Ltd.

Yuichi Itoh

Akira Uchiyama

Kyoko Kobayashi

Toru Takehara

Masaaki Kawasaki

Kazuo Yagi

Hiroyasu Yamaoka

Yasuo Kouno

Toshiyuki Tsutsui

Keiji Okada

Tetsuo Tojo

Junji Koizumi

Toshihiro Sagane

Tooru Koyama

Yoshio Yamazaki

Minoru Niwa

Sadao Uchida

Tsugunori Sugiura

Kunihiko Mizumoto

Masato Karaiwa

Kazuo Ito

Motoshi Matsuura

Shinichi Imazu

Kazunori Aotuka

Akihiro Konda

Kimio Jyougan

An olefin thermoplastic elastomer composition which is superior in the resistance to oils, heat resistance, formability and flexibility is provided, said elestomer composition comprising the components (A) 40&#x2013;90 parts by weight of a polypropylene resin having a melt flow rate (determined at 230 &#xb0; C. under a load of 2.16 kg according to ASTM D 1238) of 0.1&#x2013;5 g/10 minutes, (B) 10&#x2013;60 parts by weight of a copolymer rubber based on olefin, the contents of the components (A) and (B) summing up to 100 parts by weight, and (C) 20&#x2013;150 parts by weight of a softener, wherein the composition is in such a cross-linked state that the gel content thereof amounts to 97% by weight or higher.

Olefin thermoplastic elastomer composition

This invention relates to a perfectly or partially crosslinked olefinic thermoplastic elastomer composition which comprises 10 to 90 parts by weight of a crystalline polyolefin (a), 90 to 10 parts by weight of an olefin-based copolymer rubber (b) (the total amount of the components (a) and (b) being 100 parts by weight) and 3 to 100 parts by weight of a paraffinic mineral oil softening agent (c) having an evaporation loss of 0.4% by weight or less at a condition of 200&#xb0; C., atmospheric pressure and 1 hour and having a kinetic viscosity (40&#xb0; C.) of 50 to 250 cSt; an olefinic thermoplastic elastomer composition which is obtainable by subjecting a mixture including 40 to 85 parts by weight of an ethylene-based copolymer rubber (A), 60 to 15 parts by weight of an olefinic resin (B) and 45 parts by weight or less of a softening agent (C) [the total amount of the components (A), (B) and (C) being 100 parts by weight] to dynamic heat treatment in the presence of a crossliking agent and which has a gloss value of 80% or more and a haze value of 10% or less on glass plate when subjected to the fogging test at a condition of 100&#xb0; C. and 3 hours according to the prescription of A method of DIN 75201; and a manufacturing method and use of the compositions.

Low fogging thermoplastic elastomer composition and manufacturing method and use of same composition

An olefin thermoplastic elastomer composition comprises a crystalline polyolefin resin (A) and an ethylene/&agr;-olefin/nonconjugated polyene copolymer rubber (B), and optionally a softener (C) and/or an inorganic filler (D), in a specific ratio. The copolymer rubber (B) is prepared by the use of a metallocene catalyst and comprises ethylene, an &agr;-olefin of 3 to 20 carbon atoms and a nonconjugated polyene. This composition ca provide molded products of more excellent tensile strength, elongation at break, elastomeric properties (elongation set, permanent compression set, etc.), heat resistance and low-temperature properties than the conventional non-crosslinked olefin thermoplastic elastomers, even if the composition is in the non-crosslinked form. The composition in the partially or completely crosslinked form can provided molded products of more excellent low-temperature properties, tensile strength, elongation at break and elastomeric properties than the conventional vulcanized rubbers.

Olefin thermoplastic elastomer composition comprising crystalline polyolefin resin and ethylene/&agr;-olefin/nonconjugated polyene copolymer rubber

This invention relates to a thermoplastic elastomer composition which includes and comprises 10 to 60 parts by weight of a polyolefin (A), 30 to 87 parts by weight of a crosslinked rubber (B), 3 to 50 parts by weight of a softening agent (C) &lsqb;the total amount of (A), (B) and (C) being 100 parts by weight&rsqb; and 0.02 to 0.3 part by weight of a phenolic heat stabilizer (D) and which retains an elongation value at break by 80% or more, after aging for 500 hours in an air oven of 130&deg; C., of the value before the aging; and relates to a manufacturing method thereof.

Thermoplastic elastomer composition with high resistance to thermal deterioration

The present invention relates to an olefinic thermoplastic elastomer composition which comprises a crystalline polyolefin resin (A), an ethylene-&agr;-olefin-non-conjugated polyene copolymer rubber (B) and at least on rubber (C) selected from polyisobutylene, butyl rubber and a propylene-ethylene copolymer rubber having a propylene content of 50 mol % or more or an ethylene-&agr;-olefin copolymer (D) having a density of 0.870 to 0.940 (g/cm ) and an ethylene content of 85 mol % or more, said ethylene-&agr;-olefin-non-conjugated polyene copolymer rubber (B) being crosslinked thermoplastic elastomer composition, being obtained by random copolymerization of ethylene, and &agr;-olefin having 3 to 20 carbon atoms and a non-conjugated polyene in the presence of a metallocene catalyst, (1) containing the unit (a) derived from the ethylene and the unit (b) derived from the &agr;-olefin in a molar ratio of 40/60 to 95/5 &lsqb;(a)/(b)&rsqb;, (2) having an iodine value of 1 to 50 and (3) having an intrinsic viscosity &lsqb;&eegr;&rsqb; measured in decalin at 135&deg; C. of 1.0 to 10 dl/g; and relates to a method for manufacturing the same.

Olefinic thermoplastic elastomer composition and method for producing the same

A thermoplastic elastomer exhibiting scarce tendency of depositing gummy crust around the extrusion die upon extrusion molding articles therefrom and a superior oil-resistance, which comprises (A) a crystalline polyolefin resin and (B) a cross-linked rubber component produced by a specific melt-kneading technique and which has a certain high level of gel content, a high oil-resistance and a certain reduced rate of deposition of gummy crust on the extrusion die.

Thermoplastic elastomer and process for producing it

This invention relates to a method for manufacturing an olefinic thermoplastic elastomer composition, characterized by disposing specific kneading segment at least at one place of the screw on the occasion of manufacturing an olefinic thermoplastic elastomer composition comprising a polyolefin resin and a crosslinked rubber by dynamic crosslinking with a twin screw extruder.

Method for manufacturing olefinic thermoplastic elastomer composition

Olefinic thermoplastic elastomer, composition and use thereof

An trim material for the interior of an automobile obtained by successive injection molding. The trim comprises a surface layer and a base layer. The surface layer is formed from a composition comprising: (A) a partially cross-linked thermoplastic elastomer comprising a polypropylene resin and an &agr;-olefin copolymer rubber, and (B) a polybutylene-1 resin. The base layer is formed of a polypropylene resin or a blend of polypropylene resin and an organic filler. The interior trim material is lightweight, is easily recycled, and generates no hazardous gas when incinerated.

Interior trim for automobile

A glass run channel comprising a glass run channel body composed of a bottom wall and side walls extending from two opposite edges of the bottom wall, the glass run channel body having a substantially U-shaped section and provided with a groove, and tonguelike draining parts protruding from vicinities of distal edges of the side walls toward the bottom wall of the glass run channel body so as to become proximate to each other. Each of the tonguelike draining parts has a window glass contact part composed of a surface to be brought into contact with a window glass, which comprises a layer of a thermoplastic elastomer and a layer of an ultrahigh molecular weight polyolefin composition. The layer of ultrahigh molecular weight polyolefin composition is arranged so as to contact a window glass. The ultrahigh molecular weight polyolefin composition comprises at least a polyolefin (composition) having a specified intrinsic viscosity and an olefinic thermoplastic elastomer. The glass run channel is excellent in the durability, tight contactability with a window glass exhibited when the window glass is held closed and supple slide exhibited when a window glass is closed or opened and, even when twisted or bent, is free from a creasing of the ultrahigh molecular weight polyolefin composition layer.

Glass run channel

Steering wheel for motor vehicles

The thermoplastic elastomer composition of the invention comprises a crystalline polyolefin resin (A), an olefin rubber (B), a hydrogenated styrene block copolymer (C), a softener (D), and optionally, a peroxide non-crosslinked type hydrocarbon rubber (E) in a specific amount of each, and has a gel content of not less than 97%. This composition may be mixed with a crystalline polyolefin resin. The thermoplastic elastomer composition has excellent moldability and is able to provide a molded product having excellent elastomeric properties, high resistance to permanent compression set and good appearance. In particular, a composition obtained by mixing this thermoplastic elastomer composition and a crystalline polyolefin resin shows excellent moldability.

Thermoplastic elastomer composition

Olefin thermoplastic elastomers which comprise a partially crosslinked thermoplastic elastomer comprising a crystalline polyolefin resin (A), a block copolymer (B) which is composed of a polymer block of styrene or its derivative and a specific isoprene polymer block, and an olefin rubber (C), and thermoplastic elastomer laminates, having a substrate formed from a specific olefin thermoplastic elastomer or a crystalline polyolefin resin and a skin layer formed from the above-mentioned olefin thermoplastic elastomer, which are excellent in mechanical strength, heat resistance, heat aging resistance, weathering resistance and scratch resistance have been provided by the present invention.

Growing community of inventors

Ichihara, Japan

Yuichi Itoh