US5328975A
Expired / Lapsed
US
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Ultraviolet radiation absorbing coating
Assignee: Vitro SAB de CV
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Filing: 1993-04-02
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Granted: 1994-07-12
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Expires: 2013-04-02
Abstract
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.
Inventors
- 👤 Michael E. Hanson
- 👤 Robert M. Hunia
- 👤 Chia-Cheng Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:59
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/14
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
91 words
A coating composition for the absorption of ultraviolet radiation comprising the hydrolytic condensation polymerization reaction product of 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, 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.
Claim 2
Dependent Claim
91 words
A coating composition for the absorption of ultraviolet radiation comprising the hydrolytic condensation polymerization reaction product of 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, 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.
Claim 3
Dependent Claim
23 words
A composition according to claim 1, wherein R is selected from the group consisting of lower alkyl, vinyl, methoxyethyl, phenyl, γ-glycidoxypropyl and methacryloxypropyl.
Claim 4
Dependent Claim
20 words
A composition according to claim 1, wherein R' is selected from the group consisting of methyl, ethyl, propyl and butyl.
Claim 5
Dependent Claim
14 words
A composition according to claim 3, wherein R is γ-glycydoxypropyl and R' is methyl.
Claim 6
Dependent Claim
14 words
A composition according to claim 3, wherein x is O, and R' is ethyl.
Claim 7
Dependent Claim
25 words
A composition according to claim 1, wherein said metal alkoxide has the general formula Ti(OR'') 4 wherein R'' is a low molecular weight alkyl radical.
Claim 8
Dependent Claim
20 words
A composition according to claim 6, wherein the titanium alkoxide is titanium isopropoxide, Ti(OC 3 H 7 ) 4 .
Claim 9
Dependent Claim
12 words
A composition according to claim 1, further comprising an organic solvent additive.
Claim 10
Dependent Claim
13 words
A composition according to claim 8, wherein said solvent additive is a glycol.
Claim 11
Dependent Claim
13 words
A composition according to claim 9, wherein said solvent additive is triethylene glycol.
Claim 12
Independent Claim
115 words
A method of making an ultraviolet radiation absorbing coating composition comprising the steps of: a. partially hydrolyzing in organic solution 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; 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.
Claim 13
Independent Claim
115 words
A method of making an ultraviolet radiation absorbing coating composition comprising the steps of: a. partially hydrolyzing in organic solution 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; 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.
Claim 14
Dependent Claim
19 words
A method according to claim 11, wherein the step of partially hydrolyzing said organoalkoxysilane is carried out in alcohol.
Claim 15
Dependent Claim
19 words
A method according to claim 12, wherein the step of partially hydrolyzing said organoalkoxysilane is carried out in 2-propanol.
Claim 16
Dependent Claim
19 words
A method according to claim 12, wherein the step of partially hydrolyzing said organoalkoxysilane is carried out in ethanol.
Claim 17
Dependent Claim
13 words
A method according to claim 12, wherein said metal alkoxide is titanium isopropoxide.
Claim 18
Dependent Claim
39 words
A method according to claim 15 further comprising the step of applying said composition to a surface of a substrate, wherein said drying and heating steps are carried out on said substrate thereby forming a coating on said substrate.
Claim 19
Dependent Claim
19 words
A method according to claim 16, wherein said heating step is carried out between 750° C. and 1000° C.
Claim 20
Dependent Claim
28 words
A method according to claim 17, wherein said heating step carried out between 750° C. and 1000° C. produces crystallized anatase of 10 to 30 nanometer particle size.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-11 | 1998-01-10 | 1998-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-11 | 2002-01-10 | 2002-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-11 | 2006-01-10 | 2006-07-12 | $7700.00 | Window Closed / Lapsed |