Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-08-26
1977-06-14
Tillman, Murray
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 25N, 260 25BD, 260 25D, 260 25F, 260 25H, 260 25EP, 260 25P, C08J 902
Patent
active
040296156
ABSTRACT:
Shaped cellular structures formed from media which are polymerizable and/or cross-linkable by free radical initiation to either a thermoplastic or thermosetting solid, process for production of such structures and the composition therefor. Process comprises preparation of composition by mixing an acid sensitive azo compound with an acidulous or acidic polymerizable medium, after which the composition is permitted to foam into a cellular structure of the desired shape. Acid sensitive azo compounds are those mono- and poly- azo compounds containing the group ##STR1## wherein Y is monovalent or divalent acid sensitive group which in the presence of an acidulous or acidic polymerizable medium causes sufficient decomposition of the azo compound that gas is released in the medium and during said decomposition said mono- or poly- azo compounds promote polymerization and/or crosslinking to provide a matrix that is sufficiently polymerized and/or crosslinked that the generated gases cause the matrix to expand, the remaining valences in the group being satisfied by organic radicals; provided that any carbon atom that is directly linked to an azo nitrogen (except that of a carbonyl group) has at least two of its remaining three valences satisfied by a carbon to carbon bond or a carbon to hydrogen bond.
REFERENCES:
patent: 2576073 (1952-11-01), Kropa et al.
patent: 3260688 (1966-07-01), Watanaba et al.
patent: 3677981 (1972-07-01), Wada et al.
Kamens Ernest Rudolph
Kressin Donald Milton
Lange Harold Carl
MacLeay Ronald Edward
DeBenedictis T.
Pennwalt Corporation
Tillman Murray
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