Toyota Jidosha Kabushiki Kaisha

Ube Industries, Inc.

Other

Sumitomo Chemical Company, Limited

Kabushiki Kaisha Toyota Chuo Kenkyusho

Mitsubishi Petrochemical Company Limited

Tonen Chemical Corporation

Mitsui Petrochemical Industries, Ltd.

Tonen Sekiyukagaku Kabushiki Kaisha

Mitsubishi Chemical Corporation

Idemitsu Petrochemical Co., Ltd.

Japan Polychem Corporation

Kabushiki Kaisha

Sumitomo Dow Limited

Kyowa Leather Cloth Co., Ltd.

Takeyoshi Nishio

Takao Nomura

Ikunori Sakai

Tomohiko Akagawa

Nobuya Kawamura

Toshio Yokoi

Hisayuki Iwai

Yuichi Miyake

Kenichi Ohkawa

Osamu Fukui

Kouhei Ueno

Teruhiko Doi

Akane Okada

Hajime Sadatoshi

Hiroki Sato

Ryuichi Deguchi

Saburo Hinenoya

Ikuo Tsutsumi

Kunio Iwanami

Kaoru Inoue

Kitsusho Kitano

Takeshi Fujii

Takashi Mikami

Manabu Hirakawa

Satoru Moriya

Michihisa Tasaka

Takayuki Nagai

Shigeru Sato

Yukihito Zanka

Nobuhiro Shibuya

Kenji Kawazu

Kouichi Hatada

Junji Mayumi

Osamu Kojima

Yukitaka Goto

Yoshifumi Nakano

Shizuo Miyazaki

Kiyoshi Tsutsui

Yoshiharu Saito

Akihiko Uchikawa

Shinei Gima

Tetsuya Hisayama

Izumi Ishii

Masao Sakaizawa

Yasutoshi Jagawa

Takashi Ohta

Hiroshi Nakano

Akira Todo

Arimitsu Usuki

Hiroomi Abe

Satoshi Ueki

Mikio Hashimoto

Mitsuji Tsuji

Hideyuki Takahashi

Norio Sato

Masashi Yamamoto

Takao Yazaki

Tatsuyuki Mitsuno

Hironari Sano

Hisato Takeuchi

Mitsumasa Matsushita

Manabu Nomura

Yoshihiro Sobajima

Takayuki Okada

Mitsuyuki Okada

Masahiro Naiki

Yusuke Arashiro

Masuzo Yokoyama

Michiharu Kihira

Shigeyuki Toki

Kiyotada Narukawa

Yasuo Kita

Shinichi Yamauchi

Kentaro Yamaguchi

Shoichi Suzuki

Yoshihiro Kanome

Tetsuya Kawamura

Mikio Hirai

Teruaki Hayashida

Ken Shimizu

Mitsuhiro Murayama

Haruyuki Suzuki

Shigetoshi Sugiyama

Akihiko Yamamoto

Kiyoshi Ogura

Hirokazu Nakajima

Kenyu Ohno

Takenobu Matsumura

Yasufumi Takasaki

Saburou Hinenoya

Masatoshi Ohkura

Hirohide Mizuno

Tadashi Sezume

Norihisa Tamashima

Shinji Katsui

Yuuji Fujita

Hiroshi Ohmori

Yasuhiko Haraguchi

Hiroki Satoh

Masahiro Oosawa

Thermoplastic resin composition and injection molded article thereof

A polypropylene resin composition for use in automotive inner and outer trims, comprising 50 to 85% by weight of a crystalline polypropylene (A) having an MFR (230&deg; C.) of 7 to 70 g/10 min, 2 to 16% by weight of a hydrogenated block copolymer (B) obtained by hydrogenating at a hydrogenation ratio of at least 90% an aromatic vinyl/conjugated diene block copolymer which contains an aromatic vinyl block polymer unit in an amount of 22% by weight or less and has an MFR (230&deg; C.) of at least 5 g/10 min, and 5 to 25% by weight of an inorganic filler (G) having an average particle size of 0.1 to 3 &mgr;m as essential components. This composition may contain, as optional components, another hydrogenated block copolymer (C), an aromatic hydrocarbon copolymer (D), a crystalline polyethylene (E) and a soft ethylene/&agr;-olefin copolymer (F). This composition is excellent in heat resistance, rigidity and impact resistance and can provide a molding having beautiful appearance.

Polypropylene resin composition for use in automotive inner and outer trims

A high rigidity ethylene-propylene block copolymer which is composed of (I) a crystalline polypropylene portion and (II) an ethylene-propylene random copolymer portion, and in which the crystalline polypropylene portion (I) has a Q value of not more than 5 which is the weight average molecular weight (Mw)/number average molecular weight (Mn) ratio obtained by a gel permeation chromatography (GPC) method, an isotactic pentad fraction of not less than 0.98 as calculated from,C-NMR, and an intrinsic viscosity of 0.6 to 0.88 dl/g as measured at 135&deg; C. in tetralin; the ethylene-propylene random copolymer portion (II) has an intrinsic viscosity of 4.0 to 6.0 dl/g as measured at 135&deg; C. in tetralin and an ethylene/propylene ratio of 25/75 to 35/65 by weight; and when the total of the above polymers ((I)&plus;(II)) is taken as 100% by weight, the content of the ethylene-propylene random copolymer portion (II) is 8 to 22% by weight, and a process for producing the same.

High-rigidity ethylene/propylene block copolymer and process for the production thereof

There is provided a thermoplastic resin composition comprising the following components (A) to (E): component (A): 50 to 74.7% by weight of a Ziegler-Natta catalyst sequentially polymerized blend of a propylene homopolymer and an ethylene-propylene copolymer, component (B): 5 to 10% by weight of an ethylene-octene random copolymer, component (C): 5 to 10% by weight of an ethylene-butene random copolymer, component (D): 0.3 to 5% by weight of an elastomer.

Thermoplastic polypropylene composition

Propylene-ethylene copolymer composition and process for producing the

There is provided a sheet-shaped product of a thermoplastic elastomer provided with an embossed pattern on the surface thereof, comprising as a base material a component (II) comprising a thermoplastic elastomer, said elastomer being obtained by subjecting a composition (I) comprising the following components (A) and (B) to dynamic heat treatment carried out in the presence of an organic peroxide: component (A): from 10 to 75% by weight of an olefin resin containing 50 to 100% by weight of a crystalline propylene polymer resin, and component (B): from 90 to 25% by weight of an olefin copolymer rubber containing 10 to 100% by weight of an olefin-propylene copolymer rubber whose propylene content is from 65 to 90% by weight.

Sheet-shaped product of thermoplastic elastomer

A resin-molded product includes a phenol-based oxidation inhibitor, and a thiol-based compound. The thiol-based compound reacts chemically with a coloring substance (or a compound having a quinone-type structure) resulting from the phenol-based oxidation inhibitor to interrupt a long conjugated system arising in the coloring substance. As a result, the absorption due to the coloring substance is canceled in the visible light region. Thus, the resin-molded product is inhibited from yellowing.

Resin-molded product and yellowing inhibitor

A thermoplastic resin composition which has a melt flow rate of 25 to 30 g/10 min and a flexural modulus at 23.degree. C. of 20,000 kg/cm.sup.2 or more and which comprises (1) 78 to 87% by weight of a specific crystalline polypropylene �referred to hereinafter as (A)! in which the propylene homopolymer portion has a Q value of 3.0 to 5.0, an isotactic pentad fraction of 0.975 or more and an intrinsic viscosity �.eta.! of 1.00 to 1.10 dl/g as measured at 135.degree. C. in tetralin, (2) 3 to 10% by weight of at least two specific rubber components selected from the group consisting of (B) 1 to 9% by weight of an ethylene-butene-1 copolymer rubber, (C) 1 to 9% by weight of an ethylene-propylene copolymer rubber and (D) 1 to 9% by weight of an alkenyl aromatic compound-containing rubber; and (3) 10 to 12% by weight of talc having an average particle diameter of 4 .mu.m or less, and an injection molded article of the thermoplastic resin composition, said thermoplastic resin composition satisfying the impact strength and rigidity required as a material for an interior automotive trim and having a short molding cycle and good surface quality.

Crystalline ethylene-propylene copolymer with ethylene copolymer(s)

A polypropylene resin composition having excellent rigidity, impact resistance and formability (moldability) and thus useful for the interior parts of automobile, includes (A) a crystalline E/P block copolymer containing a fraction Ac soluble in p-xylene at room temperature and having an ethylene content of 18 to 22%; (B) a crystalline E/P block copolymer containing a fraction Bc soluble in p-xylene at room temperature and having an ethylene content of 27 to 40% and (C) talc particles having an average size of 3 to 5 .mu.m and largest size less than 20 .mu.m, in which composition, (a) the p-xylene-soluble fractions Ac and Bc are in contents As and Bs based on the total weight of the copolymers (A) and (B) and satisfying As+Bs=7 to 17% by weight and As/(A +Bs)=0.1 to 0.6; (b) an isotactic pentad fraction of propylene in each of copolymers (A) and (B) is 96% or more, and the mixture of the copolymers (A) and (B) has a MFR of 20 to 35 g/10 min at 230.degree. C. under 2160 g load; and (c) the copolymers (A) and (B) are in a total weight content of 50 to 95% and talc (C) is in a weight content of 5 to 50%.

Polypropylene resin composition

A polypropylene resin composition comprising an isotactic polypropylene component, a rubber component, and an inorganic filler component, wherein (a) the melt flow rate, according to ASTM D1238, is 20 g/10 min or more, (b) the flexural modulus, according to ASTM D790, is 2300 MPa or more, (c) the Izod impact strength, according to ASTM D256, is 180 J/m or more at 23.degree. C. and 45 J/m or more at -30.degree. C., (d) the heat deformation temperature, according to ASTM D648, is 130.degree. C. or more, and (e) there is a diffraction peak unique to polypropylene of space group P21/c in the diffraction pattern measured by the wide angle X-ray diffraction method in an injection molded article of the composition formed under a quenching condition.

A thermoplastic resin composition with improved low-temperature impact strength and rigidity against heat, comprising (I) 10-40% by weight of a mixture of (a) 10-50% by weight of a propylene homopolymer and/or an ethylene-propylene block copolymer (an isotactic pentad fraction of a propylene homopolymer portion being 0.98 or above) and (b) 50-90% by weight of an olefin-based copolymer rubber, said mixture having been dynamically heat treated in the presence of an organic peroxide and a crosslinking agent, (II) 20-85% by weight of a propylene homopolymer and/or an ethylene-propylene block copolymer (an isotactic pentad fraction of a propylene homopolymer portion being 0.98 or above and a melt index of the propylene homopolymer portion being 30-150 g/10 min), and (III) 5-40% by weight of an inorganic filler.

Thermoplastic resin composition

A polypropylene resin composition comprising the following components (A), (B), (C) and (D): (A) a crystalline ethylene-propylene block copolymer containing a room-temperature-p-xylene-soluble fraction Ac having an ethylene content of 12-26% by weight and an intrinsic viscosity (measured at 135.degree. C. in decalin) of 6 dl/g or more, (B) a crystalline ethylene-propylene block copolymer containing a room-temperature-p-xylene-soluble fraction Bc having an ethylene content of 27-50% by weight and an intrinsic viscosity (measured at 135.degree. C. in decalin) of 4 dl/g or less, (C) an ethylene-.alpha.-olefin copolymer obtained by polymerization using a single-site catalyst, having a molecular weight distribution (Mw/Mn) of 2.5 or less, a melt flow ratio (MI.sub.10 /MI.sub.2.16) of 6-15 (wherein MI.sub.10 is a melt index measured at 190.degree. C. under a load of 10 kg and MI.sub.2.16 is a melt index measured at 190.degree. C. under a load of 2.16 kg) and an .alpha.-olefin proportion of 70 mole % or less, and (D) a talc having an average particle diameter of 3-7 .mu.m as measured by laser diffraction. In the composition the weight ratios As and Bs of the room-temperature-p-xylene-soluble fractions Ac and Bc to the total weight of the components (A) and (B) satisfy the following formulas (1) and (2):

Polyproplylene resin composition

A glass fiber-reinforced thermoplastic resin excellent in providing a balance between processability, tapping strength and heat resistance. The composition comprising (A) 10 to 60% by weight of a terpolymer which comprises N-phenylmaleimide, styrene and acrylonitrile, (B) 5 to 20% by weight of a graft polymer which comprises at least one rubber selected from the group consisting of a conjugated diene rubber, an ethylene-propylene rubber and an ethylene-butylene rubber comprising ethylene and butylene, to which rubber styrene and acrylonitrile are graft polymerized, (C) 10 to 80% by weight of a copolymer which comprises styrene and acrylonitrile, and (D) 5 to 35% by weight of glass fiber, wherein (a) the terpolymer has an intrinsic viscosity of 0.20 dl/g to 0.70 dl/g, (b) the copolymer has an intrinsic viscosity of 0.40 dl/g to 1.00 dl/g, (c) the intrinsic viscosity of terpolymer is equal to or smaller than that of the copolymer, and (d) a styrene content in the copolymer minus a styrene content in the terpolymer is from +20 to -5% by weight.

Glass fiber-reinforced thermoplastic resin composition

A thermoplastic resin composition comprising (A) a propylene/ethylene block copolymer, (B) a combination of a low-crystalline ethylene/butene random copolymer resin and an amorphous ethylene/butene random copolymer rubber, or a combination of an ethylene/octene copolymer rubber and an ethylene/propylene copolymer rubber, (C) a specific block elastomer, and (D) talc. This composition has good injection molding properties, can reveal excellent flexural modulus, heat resistance and surface hardness, and is suitable for producing such injection-molded products as interior automotive trims.

Disclosed is a polypropylene resin composition for car interior fittings, comprising (a) a crystalline polypropylene, (b) particular hydrogenated block copolymer(s), (c) particular hydrogenated block copolymer(s) different from (b), and (d) a particular talc.

Polypropylene resin composition for car interior fittings

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Okazaki, Japan

Takeyoshi Nishio