Foamed and expanded beads of polypropylene resin for molding

Details Foamed and expanded beads of polypropylene resin for molding Foamed and expanded beads of polypropylene resin for molding

1999-03-23

2000-06-20

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 56, 521143, C08J 922, C08J 9228, C08J 9232

Patent

active

06077875&

ABSTRACT:
Disclosed herein are foamed and expanded beads of a polypropylene resin for molding, which comprise an uncrosslinked propylene random copolymer having a melting point of at least 140.degree. C. as a base resin, wherein the time required to attenuate an air pressure within the foamed beads applied by a pressurizing treatment with air from 1.2 kgf/cm.sup.2 (G) to 0.8 kgf/cm.sup.2 (G) under atmospheric pressure at 23.degree. C. is at least 80 minutes, and the CNI value of the foamed beads, which is defined by the following equation (1):

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