Preliminarily foamed particles of non-crosslinked polypropylene-

Details Preliminarily foamed particles of non-crosslinked polypropylene- Preliminarily foamed particles of non-crosslinked polypropylene-

1984-11-21

1986-05-06

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, 521144, C08J 922

Patent

active

045872708

ABSTRACT:
Preliminarily foamed particles of a non-crosslinked polypropylene resin based on an alpha-olefin/propylene random copolymer having an amount of the heat of crystallization in the range of 5 to 15 cal/g, said preliminarily foamed particles having such a crystal structure that when a DSC curve is drawn by means of a differential scanning calorimeter, by heating 1 to 3 mg of the preliminarily foamed particles to 220.degree. C. at a rate of 10.degree. C./min., a high temperature peak is observed at a higher temperature than the temperature of the peak inherent to the base resin.

REFERENCES:
patent: 4379859 (1983-04-01), Hirosawa et al.
patent: 4399087 (1983-08-01), Akiyama et al.
patent: 4415680 (1983-11-01), Ushirokawa et al.
patent: 4436840 (1984-03-01), Akiyama et al.
patent: 4448901 (1984-05-01), Senda et al.
patent: 4464484 (1984-08-01), Yoshimura et al.
patent: 4504601 (1985-03-01), Kuwabara et al.

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