Japan Polypropylene Corporation

Mitsubishi Chemical Corporation

Shigeo Mizukami

Takao Tayano

Yukihito Zanka

Kenjiro Takayanagi

Tatsumi Tsuji

Yuji Ryosho

Takanori Nakashima

Kuninori Takahashi

Akio Tanna

Shinichi Kitade

Iku Kouzai

Yusuke Yamada

Masashi Shimouse

Kouichi Nakayama

Keiji Fukuda

Akihiro Suzuki

Kenji Mitsutani

Shouichi Ida

Masahiro Nagata

Tomoyuki Yoshida

Ken Shimizu

Koichi Hirayama

Shiroh Gotoh

Tomohiro Hosoi

Katsuhiko Oono

A method for producing a solid catalyst component (Aa) for &#x3b1;-olefin polymerization, which includes: bringing components (A1) to (A4) into contact with one another in an inert solvent; and without washing the contact product with an inert solvent, aging the contact product by keeping for a holding time of 3 days or more and 180 days or less, regarding the time point that all of the components (A1) to (A4) first come into contact, as a starting point.

Method for producing solid catalyst component for &#x3b1;-olefin polymerization and method for producing &#x3b1;-olefin polymer using the same

An object of the present invention is to prevent an occurrence of flow-mark molding defects to improve an appearance of molded articles, and as a means for achieving the object, a propylene-based block copolymer is used as an appearance improver, the copolymer comprising 80 to 60% by weight of crystalline propylene polymer portion which has an intrinsic viscosity [&#x3b7;]p of 0.90 dL/g or less and 20 to 40% by weight of propylene/ethylene random copolymer portion which has an ethylene content of 35 to 50% by weight and an intrinsic viscosity [&#x3b7;]c of 7.0 dL/g or higher ([&#x3b7;]c/[&#x3b7;]p being 7.5 to 30), in which the propylene-based block copolymer has a MFR of 10 to 50 g/10 min.

Propylene-based block copolymer

A propylene polymerization reaction apparatus and a production method of a propylene-based polymer are capable of producing a continuous multi-stage polymer in low cost, high productivity and stably, and significantly reducing generation amount of an off-specification product accompanying change of polymerization condition, in multi-stage continuous vapor phase polymerization method of a propylene-based polymer using a catalyst for olefin polymerization. A reaction apparatus for producing a propylene-based polymer by a multi-stage continuous vapor phase polymerization method is used. One or more reactor of a horizontal-type reactor having inside a stirring machine which rotates around a horizontal axis, and a continuous stirred tank reactor to be connected to the horizontal-type reactor are provided, and a production method of a propylene-based polymer using the same.

Reactor for propylene polymerization and process for producing propylene polymer

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

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 polyolefin based biaxially oriented multi-layer film having at least one surface layer comprise of the propylene-ethylene random block copolymer; The propylene-ethylene random block copolymer obtained through sequential polymerization catalyzed by a metallocene component which is composed of 30 to 70 wt % of a propylene-ethylene random copolymer component having an ethylene content of 1 to 7 wt % produced in the first step of the polymerization and from 70 to 30 wt % of a low crystallinity or an amorphous propylene-ethylene random copolymer component produced in the second step of the polymerization having an ethylene content of 6 to 15 wt % higher than that of the polymer component obtained in the first step, wherein that shows a single peak at 0&#xb0; C. or lower in the temperature-loss tangent (tan &#x3b4;) curve obtained by dynamic mechanical analysis (DMA).

Propylene-ethylene random block copolymer and biaxially oriented multi-layer film using the same as a surface layer

Proplylene-based copolymer composition

Olefin thermoplastic elastomer composition and process for producing the same

Growing community of inventors

Mie, Japan

Shigeo Mizukami