Patent ID: 11920033
Assignee: 62911255
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 17:
18. A process for making non-isocyanate polyurethane (NIPU) foam composition comprising the steps of:
(a) selecting a polycyclic carbonate and a polyamine;
(b) mixing the polycyclic carbonate and the polyamine to form a reactant product comprising a partially cured gel matrix having urethane bonds;
(c) adding a foaming ingredient comprising a chemical blowing agent including a carbonate that decomposes in the presence of an acids and water and the decomposition is accelerated in the presence of acids and water;
(d) curing the the reactant product comprising the partially cured gel matrix and the foaming ingredient to form the NIPU foam, wherein characteristics of the NIPU foam are tunable by changing cure temperature and acid composition;
(e) optionally adding a catalyst to step (b); and
(f) optionally adding additional foaming ingredients selected from the group consisting of an accelerant, a surfactant, and a combination thereof prior to step (d);
wherein the resulting NIPU foam has a Shore A hardness from 1 to 80.