Process for preparing thermalplastic foam

Details Process for preparing thermalplastic foam Process for preparing thermalplastic foam

1991-12-10

1992-11-10

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 97, 521 98, 521142, 521143, 521146, 521910, 521 79, 521 81, 264 53, 264DIG5, 264 51, C08J 908, C08J 914

Patent

active

051623811

ABSTRACT:
This invention relates to a novel, environmentally acceptable blowing agent and blowing agent blends and a process for producing thermalplastic, and particularly polyolefin foams using the environmentally acceptable blowing agent(s). The blowing agents of the present invention comprise difluoromethane and optionally a second blowing agent component which is nonflammable and possesses good blowing agent properties. Polyolefin foam is made by mixing a polyolefin resin and the blowing agent and introducing the resin/blowing agent mixture into a zone of lower pressure.

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patent: 4927863 (1990-05-01), Bartlett
The Elements of Expansion of Thermoplastics, James G. Burt, Freon Prod. Laboratory E. I. du Pont de Nemours & Co. Wilmington, DE pp. 31-34.
Diffusion in a plane sheet, The Mathematics of Diffusion, second edition, pp. 49-51.

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