Acrylated polyurethanes based on polyoxytetramethylene glycols extended with ethylenically unsaturated dicarboxylic acids
US4794133A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1988 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Jan 4, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/6795
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An ultraviolet-curable coating composition adapted for the buffer coating of optical glass fiber consists essentially of an acrylate-capped polyurethane in admixture with at least about 25% of its weight of liquid monoethylenically unsaturated monomer having a low glass transition temperature below about 0.degree. C. and at least about 3% of N-vinyl pyrrolidone based on the weight of the low glass transition temperature monomer. The acrylate-capped polyurethane is based on a generally linear polyurethane which is the reaction product of organic diisocyanate with a stoichiometric deficiency of a modified diol which is the diester reaction product of polyoxytetramethylene glycol having a molecular weight of from about 200 to about 2000 with a stoichiometric deficiency of an ethylenically unsaturated dicarboxylic acid or substitution product thereof, especially fumaric acid, to provide a higher molecular weight polyoxytetramethylene glycol which includes ester groups and copolymerizable ethylenic unsaturation which minimize crystallinity problems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.