Process for foaming polymeric compositions with organic azo comp

Details Process for foaming polymeric compositions with organic azo comp Process for foaming polymeric compositions with organic azo comp

1988-01-11

1988-09-20

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 95, 521180, C08J 910

Patent

active

047726407

ABSTRACT:
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.

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Kerber et al., "Substitutenteneinflu auf die Kinetik des thermischen Zerfalls von unsymmetrischen Azonitrilen und Azodinitrilen," 164 Makromol. Chemie, 183 (1973).
Curtin et al., "Reaction of Organometallic Compounds with Diazonoium Salts. Synthesis of Arylazoalkanes," 21, J. Org. Chem., 1221 (1956).
Curtin et al., "Reaction of Diarylzinc Reagents with Aryldiazonium Salts. Direct Formation of cis-Azo Compounds," 26, J. Org. Chem., 1764 (1961).
O'Connor, "Tautomerism in Phenylhydrazones," 26, J. Org. Chem., 4375 (1961).
Bellamy et al., "Studies on the Possible Interconversion of Phenylhydrazones and Phenylazoalkanes. Part I," 1965, J. Chem. Soc. (London), 2788 (1965).
Fowler, "A New Synthesis of Unsymmetrical Azo Compounds," 37 J. Am. Chem. Soc., 510 (1972).
Solomon et al., "Polar Factors in Radical Dissociations. Kinetics of Decomposition of meta-Substituted Phenylazotriphenylmethanes," 79, J. Am. Chem. Soc., 4104 (1975).

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