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US 4,544,582 AGranted
Primer compositions for improving adhesion of abrasion resistant silicone coatings to plastic surfaces
AssigneeDow Corning Corporation
InventorKelly L. Benjamin
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Abstract
Primer compositions are disclosed for improving the adhesion of abrasion resistant polysiloxane coatings to plastic substrates. The primers contain a thermosettable acrylic resin, an aminofunctional organosilicon compound, and optionally an ultraviolet light screening compound. A process employing the primer compositions to provide more durable adhesion of transparent, abrasion resistant polysiloxane coatings on plastic substrates is also disclosed.
Claims10
A method of improving the durability of the adhesion of abrasion-resistant silicone coatings on plastic articles, the method comprising:
- (A) applying to the surface of a plastic article a primer composition containing from 99 to 70 weight percent of organic solvent and 1 to 30 weight percent of coating components containing
- (I) a thermosettable acrylic resin and
- (II) from 0.1 to 50 weight percent based on (I) of an aminofunctional organo silicon compound of the general formula ##STR5## wherein R is hydrogen or a monovalent hydrocarbon radical of 1 to 12 carbon atoms, R' is a divalent alkylene radical of 3 or 4 carbon atoms, R" is a monovalent radical selected from the group consisting essentially of hydrogen, alkyl radicals of 1 to 4 carbon atoms and the --CH.sub.2 CH.sub.2 NH.sub.2 radical, and x has an average value from 0 to 3;
- (B) evaporating off a substantial portion of the organic solvent of the primer composition;
- (C) thermally curing the coating components to form a primer layer on the plastic surface;
- (D) applying over the primer layer, a colloidal silica filled thermoset organopolysiloxane;
- and
- (E) thermally curing the colloidal silica filled thermoset organopolysiloxane to an abrasion-resistant silicone coating.
5 more elements
Dependencies are inferred from the claim text.