Stock material or miscellaneous articles – Composite – Of silicon containing
Patent
1974-03-29
1976-12-21
Husack, Ralph
Stock material or miscellaneous articles
Composite
Of silicon containing
260348SC, 427302, 427407C, 427322, 428413, 428451, 428520, 428522, B32B 904, B05D 310
Patent
active
039989917
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 the treated SAN substrate. By these two mechanisms the silane compound apparently provides a stable covalent chemical bond between the coating and the substrate.
REFERENCES:
patent: 2744878 (1956-05-01), Smith et al.
patent: 3616294 (1971-10-01), Khelghatian
patent: 3619246 (1971-11-01), Bragok
patent: 3650814 (1972-03-01), Elder
patent: 3650859 (1972-03-01), D'Ohario
patent: 3713880 (1973-01-01), Krekeler
Bell Janyce A.
General Motors Corporation
Grove George A.
Husack Ralph
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