Silica-free UV-absorbing abrasion resistant coatings
First Claim
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1. A silica-free coating composition for protecting a substrate from ultraviolet radiation and abrasion comprising a reaction product of:
- a. a partially hydrolyzed alkoxide selected from compounds of the general formula Rx Si(OR'"'"')4-x wherein R is an alkyl radical, and x is an integer and is less than 4; and
b. an organic compound which absorbs ultraviolet radiation selected from the group consisting of hydroxybenzophenone and hydroxybenzotriazole, where the terminal hydroxyl group is available for reacting with silanol groups, andwherein R'"'"' of said partially hydrolyzed alkoxide is an alkyl radical selected from the group consisting of methyl, ethyl, propyl and butyl radicals.
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Abstract
A silica-free, abrasion resistant and ultraviolet radiation resistant coating is disclosed comprising an organic UV absorbing compound such as hydroxybenzophenone in an inorganic oxide matrix formed by the hydrolysis and condensation of an organo alkoxysilane and a silicon other metal alkoxide.
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Citations
33 Claims
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1. A silica-free coating composition for protecting a substrate from ultraviolet radiation and abrasion comprising a reaction product of:
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a. a partially hydrolyzed alkoxide selected from compounds of the general formula Rx Si(OR'"'"')4-x wherein R is an alkyl radical, and x is an integer and is less than 4; and b. an organic compound which absorbs ultraviolet radiation selected from the group consisting of hydroxybenzophenone and hydroxybenzotriazole, where the terminal hydroxyl group is available for reacting with silanol groups, and wherein R'"'"' of said partially hydrolyzed alkoxide is an alkyl radical selected from the group consisting of methyl, ethyl, propyl and butyl radicals. - View Dependent Claims (2, 3, 4, 5, 26, 30)
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6. A silica-free coating composition for protecting a substrate from ultraviolet radiation and abrasion comprising a hydrolytic polycondensation reaction product of:
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a. a partially hydrolyzed alkoxide selected from compounds of the general formula Rx Si(OR'"'"')4-x wherein R is an alkyl radical, and x is an integer and is less than 4; b. an organoalkoxysilane selected from compounds of the general formula Ry Si(OR'"'"')4-y wherein R is an organic radical, and y is an integer and is at least one; and c. an organic compound which absorbs ultraviolet radiation selected from the group consisting of hydroxybenzophenone and hydroxybenzotriazole, where the terminal hydroxyl group is available for reacting with silanol groups, and wherein R'"'"' of said partially hydrolyzed alkoxide and R'"'"' of said organoalkoxysilane are each independently an alkyl radical selected from the group consisting of methyl, ethyl, propyl and butyl radicals. - View Dependent Claims (7, 8, 9, 10, 11, 12, 27, 31)
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13. A silica-free 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 Si(OR'"'"')4-x wherein R is an alkyl radical, R'"'"' is an alkyl radical, and x is an integer and is less than 4; b. an organoalkoxysilane of the general formula Ry Si(OR'"'"')4-y wherein R is an organic radical, R'"'"' is an alkyl radical and y is an integer and is at least one;
wherein R'"'"' of said partially hydrolyzed alkoxide and R'"'"' of said organoalkoxysilane are each independently an alkyl radical selected from the group consisting of methyl, ethyl, propyl and butyl radicals; andc. an organic compound which absorbs ultraviolet radiation containing hydrophilic extensions with terminal hydroxyl groups capable of reacting with silanol groups. - View Dependent Claims (14, 15, 16, 17, 18, 19, 28, 29, 32)
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20. 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 Si(OR'"'"')4-x wherein R is an alkyl radical, R'"'"' is an alkyl radical, and x is an integer and is less than 4; b. adding an organoalkoxysilane of the general formula Ry Si(OR'"'"')4-x wherein R is an organic radical, R'"'"' is an alkyl radical and y is an integer and is at least one; wherein R'"'"' of said partially hydrolyzed alkoxide and R'"'"' of said organoalkoxysilane are each independently an alkyl radical selected from the group consisting of methyl, ethyl, propyl and butyl radicals; and c. adding an organic compound which absorbs ultraviolet radiation containing hydrophilic extensions with terminal hydroxyl groups capable of reacting with silanol groups. - View Dependent Claims (21, 22, 23, 24, 25, 33)
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Specification