Polyurethane coated safety glass
US3979548A · kind A · utility
27Cited by
5References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1974 |
| Grant date | Sep 7, 1976 |
| Priority date | — |
| Expiry date | Nov 12, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/3163
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A scratch-resistant polyurethane coating for safety windows is made by curing a sheet of a liquid composition comprising (1) a polyglycol ether resulting from the condensation of propylene oxide with trimethylolpropane and containing 10.5%-12.0% free hydroxyls and (2) a biuret of 1,6-hexamethylene-diisocyanate, having 21-22% isocyanate groups, the weight ratio of said biuret to said polyglycol ether being about 0.9-1.1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.