UV resistant, abrasion resistant coatings
First Claim
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1. An optically transparent coating composition for protecting a substrate from ultraviolet radiation consisting essentially of:
- a. a partially hydrolyzed alkoxide of the general formula Rx M(OR'"'"')z-x wherein R is an organic radical, M is selected from the group consisting of silicon, aluminum, titanium, zirconium, cerium and mixtures thereof, R'"'"' is a low molecular weight alkyl radical, z is the valence of M and x is less than z and may be zero; and
b. a hydroxy-containing organic compound which absorbs ultraviolet radiation and which comprises hydrophilic moieties capable of reacting with said partially hydrolyzed alkoxide.
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Abstract
An ultraviolet radiation resistant coating is disclosed comprising a hydroxy-containing organic UV absorbing compound such as hydroxybenzotriazole which comprises hydrophilic moieties such as ethoxylate or propoxylate so that the compound is miscible and reactive with an inorganic oxide matrix formed by hydrolysis and condensation of an alkoxysilane and/or other metal alkoxide.
71 Citations
14 Claims
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1. An optically transparent coating composition for protecting a substrate from ultraviolet radiation consisting essentially of:
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a. a partially hydrolyzed alkoxide of the general formula Rx M(OR'"'"')z-x wherein R is an organic radical, M is selected from the group consisting of silicon, aluminum, titanium, zirconium, cerium and mixtures thereof, R'"'"' is a low molecular weight alkyl radical, z is the valence of M and x is less than z and may be zero; and b. a hydroxy-containing organic compound which absorbs ultraviolet radiation and which comprises hydrophilic moieties capable of reacting with said partially hydrolyzed alkoxide. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of preparing an optically transparent ultraviolet resistant coating composition comprising the steps of:
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a. at least partially hydrolyzing an alkoxide of the general formula Rx M(OR'"'"')z-x wherein R is an organic radical, M is selected from the group consisting of silicon, aluminum, titanium, zirconium, cerium and mixtures thereof, R'"'"' is a low molecular weight alkyl radical, z is the valence of M and x is less than z and may be zero; and b. adding to said at least partially hydrolyzed alkoxide a hydroxy-containing organic compound which absorbs ultraviolet radiation and which comprises hydrophilic moieties. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification