Japan Polypropylene Corporation

Shinichi Kitade

Kuninori Takahashi

Iku Kouzai

Takao Tayano

Hideshi Uchino

Masaru Aoki

Kazuo Asuka

Sachio Hotta

Shigeo Mizukami

Kazuya Sakata

Gen Kanai

Masato Nakano

Satoshi Katsuno

Akihiro Suzuki

Masaaki Ito

Koichi Hirayama

Kenji Masuda

Jun Shinozaki

Isamu Terayama

Hiroshi Tsuji

Koji Yamashita

Motoki Kaneno

The present invention relates to a polypropylene resin composition for a microporous film which can reduce the product defect rate due to stabilization of porous formation by stabilizing film formation and also can obtain a film suitably usable for a separator, a filtration membrane, a separation membrane and a filter since the microporous film can be thinned due to high rigidity, and more specifically, relates to a polypropylene resin composition for a microporous film wherein the composition comprises 5 to 30% by weight of polypropylene resin (X) having specific MFR, molecular weight distribution Mw/Mn by GPC, melt tension (MT), branching index g' and mm fraction of the propylene unit triads byC-NMR, satisfying specific conditions concerning gels and having a long chain branched structure and 95 to 70% by weight of polypropylene resin (Y) having a specific MFR and excluding the polypropylene resin (X).

Polypropylene resin composition for microporous film and use of polypropylene resin composition

A polypropylene-based resin composition is provided that can provide a foam molding that exhibits an excellent closed cell characteristic and excellent extrusion characteristics, that is light weight and has a rigid feel, and that has an excellent recyclability. This polypropylene-based resin composition contains 100 weight % or is less than 100 weight % but at least 70 weight % of component (A) below and contains 0 weight % or is greater than 0 weight % but not more than 30 weight % of component (B) below,

Polypropylene resin composition and expanded molding

Provided is a polypropylene-based resin composition which gives uniform and fine cells and from which a foamed sheet and thermoform excellent in appearance, thermoformability, impact resistance, lightness, stiffness, heat resistance, heat insulating properties, oil resistance and the like can be produced and includes (X) 5 to 99% by weight of a polypropylene resin having a structure with long chain branches, and (Y) 1 to 95% by weight of a propylene-based block copolymer produced by sequential polymerization, which block copolymer comprises (Y-1) a propylene (co)polymer and (Y-2) a propylene-ethylene copolymer.

Polypropylene-based resin composition and foam sheet

Provided is a polypropylene-based resin composition which gives uniform and fine cells and from which a foamed sheet and thermoform excellent in appearance, thermoformability, impact resistance, lightness, stiffness, heat resistance, heat insulating properties, oil resistance and the like can be produced. A polypropylene-based resin composition comprising (X) 5 to 99% by weight of a polypropylene resin having a structure with long chain branches, and (Y) 1 to 95% by weight of a propylene-based block copolymer produced by sequential polymerization, which block copolymer comprises (Y-1) a propylene (co)polymer and (Y-2) a propylene-ethylene copolymer.

A propylene-based polymer comprising the following component (A) insoluble in p-xylene at 25&#xb0; C. and component (B) soluble in p-xylene at 25&#xb0; C., wherein (i) the weight average molecular weight (Mw) measured with GPC is 100,000 to 1,000,000, (ii) the content of the component insoluble in hot p-xylene is 0.3% by weight or lower, and (iii) the degree of strain hardening (&#x3bb; max) in measurement of elongational viscosity is 2.0 or higher; and a method for producing the same, along with a resin composition comprising a propylene-ethylene copolymer (Z) in an amount of 50.0 to 99.9% by weight and a propylene-based polymer (M) in an amount of 0.1 to 50.0% by weight. Component (A): a component (CXIS) insoluble in p-xylene at 25&#xb0; C., having requirements specified by (A1) to (A5). Component (B): a component (CXS) is soluble in p-xylene at 25&#xb0; C., having requirements specified by (B1) to (B4).

Propylene-based polymer and method for producing the same, and propylene-based resin composition

A propylene resin composition which is a three-component material is improved in rigidity, heat resistance, and impact resistance while maintaining a satisfactory balance among these and further improved in low-temperature (about &#x2212;30&#xb0; C.) impact resistance. A propylene resin composition as described in the specification.

Propylene resin composition

A polypropylene based heat shrinkable film obtained by using a propylene-ethylene block copolymer (A) which satisfies the following requirements (A-i) to (A-iv), and having heat shrinkability imparted by orientation in at least one direction:

Polypropylene based heat shrinkable film

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).

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Mie, Japan

Shinichi Kitade