Process for producing propylene block copolymer

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

1992-07-23

1993-11-16

Schofer, Joseph L.

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

Synthetic resins

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

525249, 525254, 525270, 525323, C08F29708

Patent

active

052624870

ABSTRACT:
Propylene is copolymerized with ethylene in solvent-free 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 has undergone preliminary polymerization of an .alpha.-olefin in the absence of an organoaluminum compound. The solid catalyst components is specified. Less sticky polymer powder is obtainable.

REFERENCES:
patent: 4547552 (1985-10-01), Toyota et al.
patent: 4808667 (1989-02-01), Goko et al.
Chemical Abstracts, vol. 105, No. 9, abstract No. 153688S, "Polymerization catalysts in preparation of propylene polymers", p. 9, col. 2 (1986).**
Chemical Abstracts, vol. 101, No. 8, abstract No. 5631D, "Propylene-ethylene block copolymer", p. 54, col. 2 (1984).**

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