Method for making crosslinked resin foams from an ethylenically unsaturated dicarboxylic acid anhydride and a polyisocyanate
US4110274A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1977 |
| Grant date | Aug 29, 1978 |
| Priority date | — |
| Expiry date | Oct 17, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/6755
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.