Ultraviolet radiation absorbing coating
First Claim
1. A coating composition for the absorption of ultraviolet radiation comprising the hydrolytic condensation polymerization reaction product of an organoalkoxysilane of the general formula
wherein R is an organic radical, R'"'"' is a low molecular weight alkyl radical and x is less than 4 and may be zero, and a titanium alkoxide or colloidal titania, wherein the molar ratio of titania to silica in the reaction product is from 0.1 to 0.5 and the absorbance of the coating at 320 nanometers is at least 0.5 per micron of coating thickness.
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Abstract
An organoalkoxysilane/metal oxide sol-gel composition and method for its production are disclosed whereby an organoalkoxysilane of the general formula
R.sub.x Si(OR'"'"').sub.4-x
wherein R is an organic radical, R'"'"' is a low molecular weight alkyl radical, and x is less than 4 and may be zero, is partially hydrolyzed in organic solution and reacted with a titanium alkoxide of the general formula Ti(OR'"'"''"'"')4 wherein R'"'"''"'"' is a lower alkyl radical. The composition is hydrolyzed, dried and heat treated to form a silicon oxide/titanium oxide abrasion-resistant coating on a substrate with high ultraviolet radiation absorbance.
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Citations
18 Claims
- 1. A coating composition for the absorption of ultraviolet radiation comprising the hydrolytic condensation polymerization reaction product of an organoalkoxysilane of the general formula
- space="preserve" listing-type="equation">R.sub.x Si(OR'"'"').sub.4-x
wherein R is an organic radical, R'"'"' is a low molecular weight alkyl radical and x is less than 4 and may be zero, and a titanium alkoxide or colloidal titania, wherein the molar ratio of titania to silica in the reaction product is from 0.1 to 0.5 and the absorbance of the coating at 320 nanometers is at least 0.5 per micron of coating thickness. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of making an ultraviolet radiation absorbing coating composition comprising the steps of:
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a. partially hydrolyzing in organic solution an organoalkoxysilane of the general formula
space="preserve" listing-type="equation">R.sub.x Si(OR'"'"').sub.4-xwherein R is an organic radical, R'"'"' is a low molecular weight alkyl radical, and x is less than 4 and may be zero; b. adding to said partially hydrolyzed organoalkoxysilane a titanium alkoxide or colloidal titania; c. reacting said titanium alkoxide or titania with said partially hydrolyzed organoalkoxysilane; d. adding additional water to hydrolyze the composition; e. drying the composition; and f. heating the composition to at least 750°
C. to produce an absorbance at 320 nanometers of at least 0.5 per micron of coating thickness. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification