Process for cold forming propylene copolymers

Details Process for cold forming propylene copolymers Process for cold forming propylene copolymers

1990-04-12

1992-11-24

Seccuro, Jr., Carman J.

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

Synthetic resins

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

525322, 525240, 26433117, C08L 2310, C08L 2316, C08J 500

Patent

active

051662680

ABSTRACT:
A process for the solid phase forming of an impact polypropylene copolymer comprising (a) providing an impact polypropylene copolymer comprising (i) a matrix, which is either a homopolymer of propylene or a copolymer of propylene and up to about 5 percent by weight of at least one other alpha-olefin based on the weight of the copolymer, and, incorporated into said matrix, (ii) a copolymer of ethylene and at least one other alpha-olefin, said copolymer having a crystallinity of at least about 20 percent and being present in the impact copolymer in an amount of at least about 10 percent by weight based on the total weight of the impact copolymer; and (b) forming the impact polypropylene copolymer at a temperature above the melting point of component (ii) but below the melting point of component (i).

REFERENCES:
patent: 4036912 (1977-07-01), Stricharczuk
patent: 4634740 (1987-01-01), Fujita et al.
patent: 4882380 (1989-11-01), Ficker et al.
patent: 5028663 (1991-07-01), Chung

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