Process for producing foam by monitoring key process parameters

Details Process for producing foam by monitoring key process parameters Process for producing foam by monitoring key process parameters

1998-09-16

2000-07-25

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264 53, 264DIG5, 521 79, 521 97, 521146, B29C 4420, C08J 900

Patent

active

060933526

ABSTRACT:
In one embodiment, the present invention relates to a process for preparing a foam product including the steps of (A) forming a foamable mixture of (1) an alkenyl aromatic polymer and (2) a blowing agent under a pressure sufficient to prevent prefoaming of the mixture and (B) foaming the mixture into a region of reduced pressure to form the foam product, wherein the difference between the glass transition temperature of the foamable mixture and the foaming temperature is less than about 62.degree. C.

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