Process for producing a transparent polyurethane film with energy-absorbing and antifogging properties
US5116442A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1990 |
| Grant date | May 26, 1992 |
| Priority date | — |
| Expiry date | Nov 30, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31601
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A polyurethane film of excellent optical quality is prepared by applying to a substrate, by reactive casting or reactive spraying, a reaction mixture of an isocyanate component and a polyol component containing at least one long difunctional polyol having a molecular weight between 500 and 10,000, containing at least partial ethylene oxide segments, with the percentage by weight of ethylene oxide segments relative to the total weight of the polyurethane being greater than 20%, at least one short diol as chain extender, with the ratio of free NCO groups of the isocyanate component to free OH groups of the polyol component being between 1.5 and 2; and contacting a surface of said applied material intended to face toward the outside of the safety glass with a surface treatment compound of an acrylic derivative or isocyanate having a functionality greater than 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.