摘要:
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.
摘要:
Azo compounds such as 2-ethyl-6-methyl-phenylazo-t-butane which contain an aromatic moiety bridged to one or more alkyl moieties by azo groups are useful blowing agents in a novel process for foaming compositions of polymers such as polycarbonates.
摘要:
Azo compounds such as 2-ethyl-6-methyl-phenylazo-t-butane which contain an aromatic moiety bridged to one or more alkyl moieties by azo groups are useful blowing agents in a novel process for foaming compositions of polymers such as polycarbonates.