Process of making an interpenetrating superabsorbent polyurethane foam
US4725629A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 1986 |
| Grant date | Feb 16, 1988 |
| Priority date | — |
| Expiry date | Jul 18, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/905
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A superabsorbent polyurethane foam based on an interpenetrating polymer network of a crosslinked polyurethane and a crosslinked addition polymer containing a plurality of chain segments made up of functional group-containing repeating units which may be the same or different. The functional groups of the repeating units are selected from the group consisting of carbamoyl, substituted carbamoyl, and carboxy and the alkali metal and ammonium salts thereof. A method of preparing the foams is described which involves forming the polyurethane foam in the presence of addition polymerizable monomers and crosslinking agent and a thermally activated free radical initiator. Addition polymerization can take place during or after foam formation. Reactants and reaction conditions are selected so as to essentially avoid grafting addition polymer to polyurethane. Preferably, the polyurethane is derived from an isocyanate-terminated poly(oxyalkylene) polyol having an isocyanate functionality greater than two and the addition polymer is the reaction product of a crosslinking agent, such as methylene-bis-acrylamide and 1,6-hexanediol diacrylate, with at least one compound selected from the group con…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.