Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1977-10-17
1978-08-29
Welsh, M. J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
C08J 900, C08J 908
Patent
active
041102746
ABSTRACT:
Cellular resin bodies having apparent density less than about 30 pounds per cubic foot, where the resin has highly crosslinked three-dimensional ethylenic polymer structure having amic acid groups and/or cyclic imide linkages, are made by reaction of polyisocyanates with certain polymerizable ethylenically unsatured dicarboxylic acid cyclic anhydrides illustrated by maleic anhydride, and water. Mixture of the reactants and heating cause chemical interaction, evolution of carbon dioxide, ethylenic polymerization of intermediate reaction product, crosslinking, foaming and hardening of the resin. Cell formation is caused by carbon dioxide and water vapor in the resin reaction product. Resin foam products are infusible and insoluble in usual solvents and resist ignition and burning in air.
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Corbett John M.
Dechow Frederick J.
The Dow Chemical Company
Welsh M. J.
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