Polymer foam process

Details Polymer foam process Polymer foam process

1981-06-10

1984-01-03

Anderson, Philip E.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 50, 264 53, 264DIG5, 264321, 521 97, 521133, B29D 2700

Patent

active

044242875

ABSTRACT:
Thermoplastic foams of polystyrene, for example, are prepared with a blowing agent which is a mixture of an organic plasticizing blowing agent, such as pentane, and an atmospheric gas, such as carbon dioxide. Typically, such foams prepared with organic blowing agent alone were aged prior to thermoforming the foam into articles. Foams prepared with the mixed blowing agent of this invention exhibit the advantage of reduced atmospheric emissions on aging.

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