Transparent abrasion-resistant coating for a styrene acrylonitrile copolymer and method
US3998991A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1974 |
| Grant date | Dec 21, 1976 |
| Priority date | — |
| Expiry date | Mar 29, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31935
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In accordance with a preferred embodiment of this invention, a styrene-acrylonitrile copolymer (SAN) surface is coated with a weatherable, transparent and abrasion-resistant material. The film coating, which is typically less than one micron thick, is formed on a SAN surface which has been chemically activated by direct contact with a strong oxidizing agent. The coating consists essentially of the condensation reaction product of a partially hydrolyzed poly(vinyl acetate), equilibrated tetraethyl orthosilicate and a silane compound, which also acts as an adhesion promoting agent and which is selected from the group consisting of compounds with the general formula: ##EQU1## where x is from 1 to 10 and compounds with the general formula: ##EQU2## where x is from 1 to 10 and y is from 1 to 10. The trimethoxy functionality of the silane compound is initially hydrolyzed to a trisilanol functionality. Then by participating in a condensation reaction with the equilibrated silicate and the partially hydrolyzed acetate, the silane is chemically bound into the coating matrix. To complete the chemical link between the coating and the substrate, the epoxy functionality apparently reacts with t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.