Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1989-11-28
1990-07-10
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521 77, 521 81, 521138, 521180, 521183, 521189, C08J 908, C08J 902
Patent
active
049407333
ABSTRACT:
A process for producing cellular foamed articles from high temperature engineering polymers wherein polymeric blowing agents are utilized to expand the polymers. The process comprises mixing a first polymer capable of being foamed with a second polymer comprising at least one poly(alkylene carbonate) to provide a polymer blend; heating the polymer blend to a temperature sufficient to melt the polymer to be foamed and to decompose the second polymer to form gas inclusions within the first polymer; expanding the melted first polymer containing the gas inclusions to form a foamed article; and cooling the foamed article to a temperature below the melting or softening point of the foamed article. Polymers which may be foamed according to the process include those polymers which can tolerate processing temperatures in excess of 260.degree. C. Suitable poly(alkylene carbonate) foaming agents include poly(propylene carbonate), blends of two or more poly(alkylene carbonates) and copolymers and terpolymers formed by polymerizing two or more oxirane compounds in the presence of carbon dioxide.
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Kuphal Jeffrey A.
Robeson Lloyd M.
Santangelo Joseph G.
Air Products and Chemicals Inc.
Foelak Morton
Gourley Keith D.
Marsh Wlliam F.
Simmons James C.
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