Preliminarily foamed particles of non-crosslinked polypropylene-

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

1984-12-05

1986-01-28

Ivy, C. Warren

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521134, C08J 916, C08L 2320, C08L 2314

Patent

active

045672083

ABSTRACT:
Preliminarily foamed particles of a non-crosslinked polypropylene-type resin based on a mixture of 10 to 95% by weight of an alpha-olefin/propylene random copolymer having an amount of the heat of crystallization of not more than 10 cal/g in differential scanning calorimetry and 90 to 5% by weight of an ethylene/propylene random copolymer as a base resin, said preliminarily foamed particles having such a crystal structure that when a DSC curve is drawn by heating 1 to 3 mg of the preliminarily foamed particles to 220.degree. C. at a rate of 10.degree. C./min. by means of a differential scanning calorimeter, a high temperature peak is observed at a higher temperature than the temperature of the peak inherent to the base resin. These preliminarily foamed articles can be molded under lower vapor pressures than in the prior art.

REFERENCES:
patent: 3743611 (1973-07-01), Muroi
patent: 4379859 (1983-04-01), Hirosawa
patent: 4399087 (1983-08-01), Akiyama et al.
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patent: 4443393 (1984-04-01), Akiyama et al.
patent: 4448901 (1984-05-01), Senda et al.
patent: 4464484 (1984-08-01), Yoshimura et al.
patent: 4504534 (1985-03-01), Adachi
patent: 4504601 (1985-03-01), Kuwabara

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