Propylene-base random copolymer particles and production process

Details Propylene-base random copolymer particles and production process Propylene-base random copolymer particles and production process

1985-11-06

1986-07-22

Foelak, Morton

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

Synthetic resins

Treating polymer containing material or treating a solid...

264141, 264142, 264143, 521 56, 521 60, 521143, 528503, C08F 600, C08J 918

Patent

active

046020829

ABSTRACT:
Disclosed herein are propylene-base random copolymer particles suitable for use in the production of pre-foamed particles. The copolymer particles are obtained by heating starting copolymer particles to the crystallization temperature thereof and then quenching them in a medium of (the crystallization temperature-30.degree. C.) or lower. Processes for obtaining the copolymer particles are also disclosed. Pre-foamed particles produced using the copolymer particles contain large cells. They can thus provide foamed moldings which are substantially free of shrinkage and have good flexibility.

REFERENCES:
patent: 3445444 (1969-05-01), Kutner
patent: 3634382 (1972-01-01), Trieschmann et al.
patent: 3719648 (1973-03-01), Friedink

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