Plastic foams and method of making same

Details Plastic foams and method of making same Plastic foams and method of making same

1984-03-21

1988-03-08

Anderson, Philip

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 49, 264 53, 264101, 521 79, 521 88, 521 94, 521 95, 521 97, 521 98, 521143, 521145, 521146, 521149, C08J 926, C08J 928, B29C 4500, B29C 4700

Patent

active

047300094

ABSTRACT:
A plastic foam is made by mixing a plastic material or its origin material with a blowing agent which does not react with the material, said agent having a maximum vapor pressure of 10 Pa at the highest permissible application temperature of the plastic foam and having a minimum vapor pressure of 600 Pa at a pressure at which said material is in plastic condition. A formed body of the mixture is then exposed to a pressure low enough to evaporate the blowing agent and form bubbles in the mixture, whereupon the body is cooled at low pressure to solidify the plastic material and substantially condense said agent, thereby providing said body with closed cells having a reduced internal pressure.

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