Japan Polychem Corporation

Nissan Motor Company Limited

Japan Polypropylene Corporation

Other

Toyota Jidosha Kabushiki Kaisha

Mitsubishi Chemical Corporation

Nihon Plast Co., Ltd.

Yukihito Zanka

Takayuki Nagai

Mitsuhiro Murayama

Masashi Shimouse

Takeyoshi Nishio

Hironari Sano

Takayuki Sato

Hisayuki Iwai

Hiroki Sato

Shigeo Mizukami

Ikuo Tsutsumi

Kouichi Nakayama

Izumi Ishii

Sinichi Takaragi

Mineyuki Saotome

Masahiro Terada

Yuji Fujita

Kazuyuki Yamamoto

Akira Kawai

Satoru Ichikawa

Fumihiko Shimizu

Yoshihiro Sobajima

Kazuyuki Hata

Naomasa Sato

Masato Onoe

Motoru Komatsu

Kazuo Matsuyama

Hirosuke Kamae

Masatoshi Matsuda

Yoshihiro Banno

Tomio Hirata

Kazushige Ohnishi

Teruaki Ashihara

Yuji Ryosho

Akihiro Suzuki

Yasutoshi Jagawa

Ken Shimizu

Toshio Niimi

Takuya Kurio

Takashi Niimi

Hiroki Satoh

Yoshiharu Yamamoto

Kenji Matsuoka

A moldability modifier capable of improving molding processability, and a polypropylene resin composition using the same suitable for automobile exterior parts are provided. The invention relates to a moldability modifier comprising propylene block copolymer (A) containing from 80 to 98 wt % of a propylene homopolymer portion (A1) and from 2 to 20 wt % of a propylene/ethylene random copolymer portion (A2), wherein the MFR of (A1) is 300 g/10 min or more, the ethylene content of (A2) is from 10 to 70 wt %, the [&#x3b7;] of (A2) is 6.5 dl/g or more, and the MFR as a whole is 40 g/10 min or more; and propylene block copolymer (B) containing from 20 to 79 wt % of a propylene polymer portion (B1) and from 21 to 80 wt % of a propylene/ethylene random copolymer portion (B2), wherein the MFR of (B1) is 20 g/10 min or more, the ethylene content of (B2) is from 20 to 70 wt %, the [&#x3b7;] of (B2) is from 2.5 to 9.0 dl/g, and the MFR as a whole is from 0.1 to 50 g/10 min; and a polypropylene resin composition using the same.

Moldability modifier and polypropylene resin composition using the same

A polypropylene resin composition contains 2 to 15 wt % of a moldability improver (A) and 85 to 98 wt % of a polypropylene resin (B). The moldability improver (A) is formed of propylene block copolymers (A-1) and (A-2). Each of the propylene block copolymers (A-1) and (A-2) has a crystalline propylene polymer component (A-11), (A-21) and a propylene-ethylene random copolymer component (A-12), (A-22). The propylene block copolymer (A-1) is characterized in that the melt flow rate of the crystalline propylene polymer component (A-11) is high, whereas the propylene block copolymer (A-2) is characterized in that the content ratio of the propylene-ethylene random copolymer component (A-22) is high. The polypropylene resin (B) is formed of a propylene-ethylene block copolymer (B-1), at least one of an ethylene elastomer and a styrene elastomer (B-2) and an inorganic filler (B-3).

Polypropylene resin composition, resin molded part and production method thereof

Provided are a molding appearance modifier for resins capable of controlling appearance of large-sized molded parts only by small addition, and a polypropylene resin composition capable of providing good appearance to, for example, automobile exterior parts, and has excellent molding processability. The invention relates to a propylene block copolymer having a crystalline propylene polymer portion and a propylene&#x2022;ethylene random copolymer portion, wherein the crystalline propylene polymer portion has an intrinsic viscosity [&#x3b7;]of 1.2 dl/g or less; the propylene&#x2022;ethylene random copolymer portion has an ethylene content of 30 to 70 wt. %, has an intrinsic viscosity [&#x3b7;]of 2.5 to 7.0 dl/g, and is added in an amount of 40 to 80 wt. % based on the whole propylene block copolymer; and the propylene block copolymer, in its entirety, has a melt flow rate of 0.1 to 10 g/10 min; and a [&#x3b7;]/[&#x3b7;]ratio falls within a range of 2.5 to 10; and a polypropylene resin composition using the propylene block copolymer as a molding appearance modifier.

Polypropylene block copolymer, uses thereof, and polypropylene resin composition containing the same

A polypropylene type aqueous dispersion comprising the following components (a) to (c): wherein the component (a) has a main chain having the following features (1) and (2) and dispersion particles in the dispersion have an average particle size of at most 0.5 &#x3bc;m, Feature (1) when observing a peak derived from a carbon atom of a methyl group in a propylene unit chain part comprising a head-to-tail bond byC-NMR and fixing a chemical shift of a peak top at a peak attributable to pentad expressed by mmmm to 21.8 ppm, a ratio (S/S) of an area Sof a peak of a peak top at 21.8 ppm to a total area S of peaks at from 19.8 ppm to 22.1 ppm is at least 10% and at most 60%, and when an area of a peak (mmmr) of a peak top at 21.5 to 21.6 ppm is expressed as S, 4+2S/S&#x3e;5, and Feature (2) a content ratio (mol ratio) of propylene unit (A): other olefin unit (B) is from 100:0 to 90:10.

Polypropylene type aqueous dispersion, polypropylene type composite aqueous emulsion composition and its use

A polypropylene-based resin composition of drastically improved dimensional stability realized by incorporating a polypropylene resin of specific structure with an inorganic filler of specific particle size, carbon fibers of specific fiber diameter and length, and, as required, an ethylene- and/or styrene-based elastomer. Another polypropylene-based resin composition of well-balanced properties of rigidity, heat-resistance, impact resistance and lightness even essentially in the absence of inorganic filler, realized by compositing a propylene/ethylene block copolymer of specific structure and well-balanced mechanical properties with an ethylene- and/or styrene-based elastomer, and carbon fibers of specific structure.

Polypropylene-based resin composition and molded article thereof

The invention provides a polypropylene based resin composition, which has good moldability on injection molding and which is excellent in its flow mark appearance as well as weld appearance on molding, and suitable for injection-molded articles such as exterior parts of automobiles, and also provides a moldability modifier used for the composition. The invention is a moldability modifier for a polypropylene based resin, which comprises at least one of a propylene homopolymer and a propylene random polymer having die swell ratio of 1.5 to 2.5 and ratio (Q value: Mw/Mn) of 7 to 13 of the weight average molecular weight (Mw) to the number average molecular weight (Mn) measured by gel permeation chromatography (GPC). The moldability modifier is mixed with a propylene-ethylene block copolymer, an ethylenic or styrenic elastomer, an inorganic filler, etc. to prepare a polypropylene based resin composition.

Moldability modifier for polypropylene resin and polypropylene resin composition containing the same

The present invention provides a resin composition high in melting flow, exhibiting good properties, excellent in moldability and shrinkage properties, and hence suitable for automobile exteriors, by including (A) propylene/ethylene block copolymer having a melt flow rate (MFR) of 100 to 200 g/10 min., its propylene homopolymer component having an MFR of 210 to 400 g/10 min. and isotactic pentad fraction of 0.98 or more, and its copolymer portion containing propylene at 65 to 85% by weight; 50 to 70% by weight, (B) ethylene/octene and/or ethylene/butene random copolymer; 10 to 25% by weight, (C) styrene-based hydrogenated block copolymer rubber; 4 to 9% by weight and (D) talc; 16 to 24% by weight.

Propylene resin composition excellent in moldability and physical properties

The present invention provides A polypropylene-based resin composition, comprising (A) 45 to 85 wt. % of a propylene/ethylene block copolymer, having a melt flow rate (MFR) of 100 g/10 min. or more for the propylene homopolymer portion and 50 to 200 g/10 min. for the total copolymer, (B) 0.5 to 20 wt. % of a propylene homopolymer having a weight-average molecular weight (Mw) of 10,000 to 110,000, (C) 5 to 35 wt. % of an ethylene/&agr;-olefin copolymer rubber and/or ethylene/&agr;-olefin/non-conjugate diene copolymer rubber, and/or hydrogenated block copolymer rubber, having an MFR of 0.1 to 20 g/10 min., and (D) 5 to 30 wt. % of talc having an average particle size of 10 &mgr;m or less, determined by the laser diffraction method.

Polypropylene-based resin composition of excellent moldability and giving molded product of excellent appearance

Disclosed is a high-concentration talc masterbatch comprising: (A) 10 to 60 parts by weight of an elastomer having a melt flow rate of from 0.5 to 150 g/10 min; (B) 40 to 90 parts by weight of talc having an average particle diameter of from 1 to 15 &mgr;m; and (C) 0.01 to 5 parts by weight of a metal soap, based on 100 parts by weight of the sum of the ingredients (A) and (B).

High-concentration talc masterbatch

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

A polyolefin-based plastic composition suitable for an automotive molded pillar member such as a pillar garnish. The plastic composition comprises (A) block copolymer in an amount ranging from 53 to 68 parts by weight, the block copolymer having a Melt Flow Rate (at 230.degree. C. and under 2.16 kg) ranging from 20 to 50 g/10 min. and containing crystalline polypropylene section in an amount ranging from 90 to 95% by weight, having a density of not lower than 0.908 g/cm.sup.3, and propylene-ethylene random copolymer section in an amount ranging from 5 to 10% by weight, the propylene-ethylene random copolymer section having an ethylene content ranging from 35 to 45% by weight; (B) ethylene-1-butene copolymer rubber in an amount ranging from 12 to 20 parts by weight and having a density ranging from 0.85 to 0.87 g/cm.sup.3 and a Melt Flow Rate (at 230.degree. C. and under 2.16 kg) ranging from 0.2 to 5 g/10 min., the copolymer rubber containing 1-butene in an amount ranging from 30 to 40% by weight; and (C) talc in an amount ranging from 22 to 30 parts by weight and having a length not more than 15 .mu.m and an average particle size ranging from 1.5 to 6 .mu.m, the talc having an average aspect ratio not lower than 5. The polyolefin-based plastic composition has a Melt Flow Rate (at 230.degree. C. and under 2.16 kg) not lower than 8 g/10 min., a Flexural Elastic Modulus not lower than 1960 MPa when molded, and an IZOD not lower than 0.088 KJ/m when molded, and a Rockwell hardness (in R scale) not lower than 65 when molded.

Polyolefin-based plastic composition and automotive molded article

A thermoplastic resin composition improved in terms of prevention of mold contamination, comprising the following components (A) to (G):

Thermoplastic resin composition improved in terms of prevention of mold

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.

Thermoplastic resin composition

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Mie, Japan

Yukihito Zanka