Process for producing propylene block copolymer

Details Process for producing propylene block copolymer Process for producing propylene block copolymer

1992-11-13

1994-06-28

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...

525270, 525323, C08F29708

Patent

active

053247841

ABSTRACT:
Propylene is copolymerized with ethylene in solventfree polymerization in two steps where a resinous polymer is produced in the first step and a rubbery polymer is produced in the second step over a Ziegler catalyst whose solid catalyst component comprises a sub-component which is a solid catalyst component for a Ziegler catalyst comprising Ti, Mg and a halogen and which has, in accordance with the present invention, undergone mechanical milling. The solid catalyst components is specified. Less Sticky polymer powder is obtainable.

REFERENCES:
patent: 4380608 (1983-04-01), Hasuo et al.
patent: 4547552 (1985-10-01), Toyota et al.
patent: 4703026 (1987-10-01), Matsuura et al.
patent: 4739015 (1988-04-01), Toyota et al.
patent: 4808667 (1989-02-01), Goko et al.
Chemical Abstracts, vol. 101, No. 8, 1984, p. 54, & JP-A-59041316, Mar. 7, 1984, "Propylene-ethylene block copolymer".
Chemical Abstracts, vol. 105, No. 9, 1986, p. 9, & JP-A-61047712, Mar. 8, 1986, "Polymerization catalysts in preparation of propylene polymers".

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