Mitsui Chemicals, Inc.

Prime Polymer Co., Ltd.

Yasuhiro Kai

Kenji Sugimura

Keita Itakura

Atsushi Morita

Motoyasu Yasui

Kenji Michiue

Kazuto Sugiyama

Mineo Kubo

Nobuhisa Mikawa

Naoya Noda

Akiyoshi Taguchi

An object of the present invention is to provide a highly heat resistant and highly rigid propylene-based polymer having unprecedentedly high stereoregularity. The propylene-based polymer of the present invention satisfies requirements (1) to (4) and preferably requirement (5): (1) an average meso chain length is 800 to 100,000; (2) a MFR is 0.5 to 1,000 g/10 minutes; (3) a ratio of Mw to Mn, Mw/Mn, as measured by GPC is 4.2 to 20; (4) when the ratio of a component which elutes at a temperature of 122&#xb0; C. or more as measured by temperature rising elution fractionation (TREF) is A % by weight and the melt flow rate of the requirement (2) is B g/10 minutes, 100&#x2265;A&#x2265;20&#xd7;EXP(&#x2212;0.01&#xd7;B); (5) an amount of a component soluble in n-decane at 23&#xb0; C. is 0.01 to 2% by weight.

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

There are provided a polyolefin resin composition having excellent mechanical properties and thermal resistance; a film formed of the polyolefin resin composition, which has excellent mechanical properties and thermal resistance and which is less likely to suffer from fisheyes; a microporous membrane having excellent permeability and shutdown properties in addition to the above-mentioned physical properties; and applications thereof. Such objects are accomplished by a polyolefin resin composition containing an ultra-high molecular weight ethylene polymer (A), a 4-methyl-1-pentene polymer or 3-methyl-1-pentene polymer (B), and a polymer of an olefin having 2 to 12 carbon atoms (C) at an intended ratio.

Polyolefin resin composition and applications thereof

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Otake, Japan

Yasuhiro Kai