Expanded polypropylene films

Details Expanded polypropylene films Expanded polypropylene films

1985-09-30

1987-01-20

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 86, 521 88, 521 91, 521143, 521144, 521908, 521 79, 525240, C08J 908

Patent

active

046380159

ABSTRACT:
Disclosed are films made of expanded polypropylene, which have a uniform specific gravity d of from about 4.25.times.10.sup.-6 to about 6.50.times.10.sup.-6 Newton/mm.sup.3, a crystallization temperature of from about 115.degree. C. to about 135.degree. C. and an elastic modulus Me expressed in Newton/mm.sup.3 such that the ratio Me:d is from about 1.6.times.10.sup.8 to about 2.0.times.10.sup.8 mm.

REFERENCES:
patent: 3207739 (1965-09-01), Wales
patent: 3268499 (1966-08-01), Wales
patent: 3725317 (1973-04-01), Roden
patent: 3808300 (1974-04-01), Miyamoto et al.
patent: 3839238 (1974-10-01), Ealding
patent: 3962154 (1976-06-01), Elgi
patent: 4407768 (1983-10-01), Garcia
Kuhre et al., "Crystallization-Modified Polypropylene", SPE Journal, Oct., 1964, pp. 1113-1119.

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