Resin composition of polyol (allyl carbonate) and allyl terminated aliphatic urethane
US5236978A · kind A · utility
39Cited by
5References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1991 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Sep 27, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F290/061
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Describes polymerizable organic resin compositions of from about 70 to 90 weight percent of a polyol(allyl carbonate), e.g., diethylene glycol bis(allyl carbonate), and from about 30 to 70 weight percent of aliphatic polyurethane having terminal allylic unsaturation. The polymerizable compositions have initiated pot life times of at least about 24 hours at 25.degree. C. and castings that have low yellowness (b*) values. Polymerizates prepared from such compositions may be used to prepare photochromic articles, e.g., lenses, by incorporating a photochromic substance, e.g., by thermal transfer, into the polymerizate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.