Polyurethane layer possessing energy-absorbing properties and its use in safety glass
US5039573A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1990 |
| Grant date | Aug 13, 1991 |
| Priority date | — |
| Expiry date | Mar 20, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31601
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyurethane-based sheet of high optical quality having energy-absorbing properties, obtained by the reactive pouring or spraying, on a flat, horizontal base, of a reactive mixture of an isocyanate component and a polyhydric alcohol component is disclosed. The ratio of the NCO equivalent isocyanate groups to the OH equivalent groups used in approximately equal to 1. The isocyanate component comprises a mixture of 3-isocyanatomethyl-3,5,5-trimethylcyclohexylisocyanate (isocyanate I) and bis-4-isocyanatocyclohexylmethane (isocyanate II), in a proportion of an isocyanate (I) NCO equivalent of 0.1 to 0.8, and of an isocanate (II) NCO equivalent, with the total NCO equivalent being about 1. The layer according to the invention is used in laminated glass containing at least one sheet of glass and one layer of a plastic material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.