High optical quality transparent sheet of plastic which is scratch- and abrasion-resistant, method of manufacturing the same and glazings using the same
US4921759A · kind A · utility
41Cited by
17References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1987 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Dec 21, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31601
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A high optical quality transparent plastic sheet having a polyurethane layer formed by reactive pouring or reactive pulverization onto a flat horizontal support of a reaction mixture containing a polyol component and an isocyanate component, with the surface of the polyurethane layer which was facing the support during the formation of the layer containing an acrylic polymer resulting from the contact, during deposition of the reaction mixture, of the reaction mixture with a thin acrylic layer previously deposited on the support. The acrylic layer and the polyurethane layer are interpenetrated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.