High heat distortion temperature transparent polyurethanes
US4808690A · kind A · utility
52Cited by
4References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 29, 1988 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | Feb 29, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/6644
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A transparent polyurethane has exceptionally high heat distortion temperatures, that is at least 280.degree. F. at 264 psi, as well as good light transmission, ultraviolet light resistance, abrasion resistance, and the like. The urethane intermediate is one or more very low equivalent weight, multifunctional hydroxy containing compounds so that when reacted with a polyisocyanate and cured with a low equivalent weight, multifunctional polyol, a highly crosslinked polyurethane is produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.