METHOD FOR PRODUCING PROPYLENE-BASED POLYMER AND PROPYLENE-BASED POLYMER

Japanese Patent JP2009161590

A

To provide a propylene-based polymer which can reduce fish eyes of a surface protecting film.

A process for producing the propylene-based polymer includes a first step of subjecting propylene to bulk polymerization of at least two stages in the presence of an olefin polymerization catalyst, a second step of polymerizing propylene and another olefin in the presence of the polymer obtained in the first step, and a third step of granulating the polymer obtained in the second step. The propylene-based polymer satisfies (1) a melt flow rate (MFR) of 1-10 g/min, (2) an n-decane soluble content of 5-15 wt.%, (3) a ratio of []ep to []h of 0.8-1.2, (wherein []ep is an intrinsic viscosity of the n-decane soluble component and []h is an intrinsic viscosity of an n-decane insoluble component), and (4) a content of an ethylene unit in the n-decane soluble component of not more than 40 mol%.

WO/2007/102227	OLEFIN BLOCK COPOLYMER
JP6659698	A method for preparing a block copolymer containing a first polyolefin block and a second polymer block, and a product obtained from the method.
JP5250303	Propylene resin composition

KIMURA TOKUTARO
HASHIZUME SATOSHI
YOSHIKAWA HIROYUKI
KAWADA ATSUO

JP2007339753A

July 23, 2009

December 28, 2007

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PRIME POLYMER CO LTD

C08F297/08; C08F10/06

JP2000086734A	2000-03-28
JPS57145115A	1982-09-08
JP2002088170A	2002-03-27
JPH06145268A	1994-05-24
JPH09324022A	1997-12-16
JP2009173897A	2009-08-06
JPH08231662A	1996-09-10

Kihei Watanabe
Yuko Tanaka
Takeshi Sato

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