Organosilicone coating compositions
OwnerGerald D. Treadway, Brian J. Carrinventors
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Abstract
Coating compositions in accordance with the invention are usefully coated on substrates, such as plastic lenses, and cured. The cured coatings provide excellent abrasion resistance and good adherence and weathering properties. The coating compositions comprise an organic solvent and a mixture of at least two components derived by partial hydrolysis from precursor organosilicone compounds. The precursor compounds include a plurality of alkoxy groups, and the at least two components are partially hydrolyzed by greater than 40% of a stoichiometric amount of water required to hydrolyze the alkoxy groups. A first component of the two components is in an imine, aminal or enamine form, which extends working life of the coating compositions.
Claims22
A coating composition, useful for forming mar resistant coatings, comprising:
- an organic solvent;
- and,
- a mixture of at least two components, said mixture being dissolved in said organic solvent, a first component of said at least two components being derived from an aminoalkylalkoxysilane precursor as a partially hydrolyzed, nitrogen containing imine, aminal, enamine, or mixture thereof, a second component of said at least two components being an epoxy containing, partially hydrolyzed compound derived by partial hydrolysis from an epoxyalkylalkoxysilane precursor, said aminoalkylalkoxysilane precursor and said epoxyalkylalkoxysilane precursor both having a plurality of alkoxy groups, said first and second components being partially hydrolyzed by greater than 40% of a stoichiometric amount of water required to hydrolyze said plurality of alkoxy groups.
A coating composition, useful for providing thermoset, mar resistant coatings and having an extended working life, formed by the steps comprising:
- (a) partially hydrolyzing alkoxy groups of an aminoalkylalkoxysilane;
- (b) forming a partially hydrolyzed condensate between the partially hydrolyzed aminoalkylalkoxysilane of step (a) and an excess of a carbonyl containing compound;
- (c) partially hydrolyzing alkoxy groups of an epoxyalkylalkoxysilane;
- and,
- (d) admixing the partially hydrolyzed condensate of step (a) with the partially hydrolyzed epoxyalkylalkoxysilane of step (c), the partially hydrolyzed condensate and the partially hydrolyzed epoxyalkylalkoxysilane being partially hydrolyzed by from about 60% to about 80% of a stoichiometric amount of water required for complete hydrolysis.
A method for increasing the working life of silane based coating compositions comprising
- (a) partially hydrolyzing alkoxy groups of an aminoalkylalkoxysilane;
- (b) forming a partially hydrolyzed imine condensate from the partially hydrolyzed aminoalkylalkoxysilane of step (a) and an excess of a carbonyl compound;
- (c) partially hydrolyzing alkoxy groups of an epoxy alkylalkoxysilane;
- (d) admixing the partially hydrolyzed imine condensate of step (b) with the partially hydrolyzed epoxyalkylalkoxysilane of step (c);
- (e) then regenerating partially hydrolyzed aminoalkylalkoxysilane from the partially hydrolyzed imine condensate to thereby react the regenerated partially hydrolyzed aminoalkylalkoxy silane with the epoxy alkylalkoxysilane.
A method for producing highly mar and scratch resistant coatings based on the condensation products of aminoalkylalkoxysilanes and epoxyalkylalkoxysilanes comprising
- (a) dissolving aminoalkylalkoxysilane in an organic solvent;
- (b) adding sufficient water to hydrolyze greater than 40 percent of the alkoxy groups of said aminoalkylalkoxysilane;
- (c) reacting the hydrolyzed aminoalkylalkoxysilane with a carbonyl compound to form hydrolyzed iminoalkylalkoxysilane;
- (d) dissolving epoxyalkylalkoxysilane in an organic solvent;
- (e) adding sufficient water to hydrolyze greater than 40 percent of the alkoxy groups of said epoxyalkylalkoxysilane;
- (f) combining said hydrolyzed iminoalkylalkoxysilane solution with said hydrolyzed epoxyalkylalkoxysilane solutions;
- (g) regenerating aminoalkylalkoxysilane from said iminoalkylalkoxysilane by adding further moisture to the combined solutions;
- (h) reacting said regenerated aminoalkylalkoxysilane with the epoxyalkylalkoxysilane;
- and then
- (i) coating the reacted aminoalkylalkoxysilane and epoxyalkylalkoxysilane onto a substrate;
- and
- (j) evaporating the organic solvent to yield an adherant mar and scratch resistant coating on said substrate.
Dependencies are inferred from the claim text.