Polypropylene resin prefoamed particles

Details Polypropylene resin prefoamed particles Polypropylene resin prefoamed particles

1987-08-07

1989-06-20

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, 521 60, C08J 922, C08J 924

Patent

active

048409731

ABSTRACT:
Prefoamed particles consisting essentially of an ethylene/propylene random copolymer, wherein said prefoamed particles are obtained by foaming particles of an ethylene/propylene random copolymer containing 1 to 4% by weight of random-copolymerized ethylene at a temperature in the range of from Tm - 15.degree. C. to Tm - 5.degree. C. (in which Tm is a temperature at which to terminate melting of the copolymer) and within the range of 141.degree. to 151.degree. C., and wherein said prefoamed particles have a crystal structure characterized in that in a DSC curve obtained by heating 1 to 3 mg of the copolymer prefoamed particles to 220.degree. C. at a heating rate of 10.degree. C./min. with a differential scanning calorimeter, there appear a peak (characteristic peak) characteristic of the copolymer and another peak (high temperature peak) at a higher temperature than a temperature at which the characteristic peak appears.

REFERENCES:
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patent: 4415680 (1983-11-01), Ushirokawa et al.
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patent: 4440703 (1984-04-01), Akiyama et al.
patent: 4567208 (1986-01-01), Kuwabara et al.
patent: 4587270 (1986-05-01), Kuwabara et al.

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