Acid containing isocyanate-terminated prepolymers, salt prepolymers and polymers thereof
US4963637A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 23, 1989 |
| Grant date | Oct 16, 1990 |
| Priority date | — |
| Expiry date | Jun 23, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/765
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is directed to novel isocyanate-terminated prepolymers of carboxylic acid grafted polyethers, salts of these prepolymers and fully reacted polymers formed therefrom. More specifically, the present invention relates to reacting an ethylenically unsaturated mono-carboxylic acid with a polyether in the presence of a free radical initiator to form a graft copolymer. Acid-containing isocyanate-terminated prepolymers can then be formed by reacting the graft copolymer with an isocyanate. Salt-containing isocyanate-terminated prepolymers are prepared through the reaction between the acid-containing prepolymer and a base. Finally, polymers are formed by curing either of these isocyanate-terminated prepolymers with an isocyanate reactive material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.