Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1993-08-20
1995-05-02
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
264 53, 264DIG5, B29C 4420
Patent
active
054116830
ABSTRACT:
A method is disclosed for making thermoplastic foam wherein the blowing agent is a combination of 1,1-difluoroethane and CO.sub.2 gas. Applicant has found that the combined blowing agents unexpectedly have significantly enhanced blowing agent efficiency, so that 1 lb of CO.sub.2 gas per hour can replace as much as 2-3 lbs 1,1-difluoroethane per hour, while still providing satisfactory efficiency as a blowing agent. The foams so produced are capable of being manufactured into foam articles of acceptable quality. Preferred proportions of the blowing agents to produce foams of desired densities are disclosed.
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Kuhns Allan R.
Sweetheart Cup Company Inc.
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