Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1988-10-11
1991-04-09
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521180, 521139, 521146, 521147, 521148, C08J 910
Patent
active
050065670
ABSTRACT:
Hydrazone compounds having two organic moieties joined by a hydrazone group, such as phenylacetone t-butyl hydrazone, are useful blowing agents for foaming polymers, such as bisphenol A/phosgene polycarbonate at temperatures above about 280.degree. C., and particularly at about 300.degree. C. to about 310.degree. C. Polycarbonate polymers formed using the hydrazones as foaming agents show a high impact strength.
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Bellamy et al., "Studies on the Possible Interconversion of Phenylhydrazones and Phenylazoalkanes. Part 1," 1965, J. Chem. Soc. 2788, (1965).
Wolf et al., "Process for Foaming Polymeric Compositions with Organic Azo Compounds and Compositions Associated Therewith," Ser. No. 221,696, (filed Jul. 20, 1988).
Fazio Michael J.
Wilson Edwin J.
Wolf Richard A.
Wollowitz Susan
Foelak Morton
The Dow Chemical Company
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