Ethylene-propylene copolymers for foaming and process for produc

Details Ethylene-propylene copolymers for foaming and process for produc Ethylene-propylene copolymers for foaming and process for produc

1983-08-11

1985-04-09

Briggs, Sr., Wilbert J.

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

Synthetic resins

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

521144, 521 79, 521 92, 525268, 525323, C08F29708

Patent

active

045102929

ABSTRACT:
An ethylene-propylene block copolymer capable of producing foamed shaped articles having a structure of uniform and fine foams even without adding any other resins, and a process for producing the same are provided, which copolymer consists of a propylene homopolymer portion and an ethylene-propylene (EP) copolymer portion and is characterized in that .circle.1 the former portion is obtained by polymerizing propylene at two stages so that the portion can further consist of a lower molecular weight portion and a higher molecular portion; .circle.2 between the melt flow rates of the resulting block copolymer under a specified load and five times the load, there is a specified relationship; .circle.3 the EP copolymer portion has an ethylene content of 60 to 95% by weight based on this portion; and .circle.4 the block copolymer has an ethylene content of 10 to 40% by weight based on the copolymer.

REFERENCES:
patent: 4291138 (1981-09-01), Sato et al.

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