Process for preparing propylene block copolymers

Details Process for preparing propylene block copolymers Process for preparing propylene block copolymers

1994-12-01

1996-01-23

Delmendo, Romulo H.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525268, 525270, 525288, 525308, 525312, 525323, C08F29708

Patent

active

054865727

ABSTRACT:
A process for preparing propylene block copolymers, comprising a preceding polymerization step in which a crystalline homopolymer of propylene, or a propylene-ethylene copolymer containing 7 wt. % or less of ethylene is produced in the presence of a catalyst comprising the following components (A) and (B), and a succeeding polymerization step in which the polymerization is continued in the presence of at least part of the homopolymer or copolymer, and of the following component (C) further added to give a copolymer with a polymerization ratio (weight ratio) of propylene to ethylene of from 0/100 to 90/10; the polymerization amount at the preceding polymerization step being from 30 to 95 wt. % of the total polymerization amount at the preceding and succeeding polymerization steps;

REFERENCES:
patent: 4259461 (1981-03-01), Shiga et al.
patent: 4547552 (1985-10-01), Toyota et al.
patent: 4808667 (1989-02-01), Goko et al.
patent: 5081190 (1992-01-01), Asanuma et al.
patent: 5225501 (1993-07-01), Fujita et al.
patent: 5331054 (1994-07-01), Fujita et al.
WPIL, AN 89-029601 & JP-A-63-305115, Dec. 13, 1988.

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