US4027073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigment-free coating compositions
Assignee: Dow Silicones Corp
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Filing: 1976-06-21
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Granted: 1977-05-31
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Expires: 1996-06-21
Abstract
Abstract An acidic dispersion of colloidal silica and hydroxylated silsesquioxane in an alcohol-water medium is coated onto solid substrates, such as acrylic lenses, to provide an abrasion resistant coating.
Inventors
- 👤 Harold A. Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:04
CPC Classifications
C; C09; C09D; C09D1/00; B; B29; B29D; B29D11/00; B29D11/00865; C09D183/00; C09D183/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31652; Y10T428/31663; Y10T428/31786; Y10T428/31855
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
127 words
An article comprising a solid substrate coated with a pigment free coating composition comprising a dispersion of colloidal silica in lower aliphatic alcohol-water solution of the partial condensate of a silanol of the formula RSi(OH) 3 in which R is selected from the group consisting of alkyl radicals of 1 to 3 inclusive carbon atoms, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gamma-glycidoxypropyl radical and the gamma-methacryloxypropyl radical, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , said composition containing 10 to 50 weight percent solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate, said composition containing sufficient acid to provide a pH in the range of 3.0 to 6.0.
Claim 2
Dependent Claim
127 words
An article comprising a solid substrate coated with a pigment free coating composition comprising a dispersion of colloidal silica in lower aliphatic alcohol-water solution of the partial condensate of a silanol of the formula RSi(OH) 3 in which R is selected from the group consisting of alkyl radicals of 1 to 3 inclusive carbon atoms, the vinyl radical, the 3,3,3-trifluoropropyl radical, the gamma-glycidoxypropyl radical and the gamma-methacryloxypropyl radical, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , said composition containing 10 to 50 weight percent solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate, said composition containing sufficient acid to provide a pH in the range of 3.0 to 6.0.
Claim 3
Dependent Claim
32 words
An article in accordance with claim 1 where in the coating composition, the acid is a water miscible organic acid selected from the group consisting of acetic, formic, propanoic and maleic acid.
Claim 4
Dependent Claim
26 words
An article in accordance with claim 2 wherein the coating composition contains from about 0.05 to 1.5 weight percent of a buffered latent silanol condensation catalyst.
Claim 5
Dependent Claim
13 words
An article in accordance with claim 3 wherein said solid substrate is transparent.
Claim 6
Dependent Claim
14 words
An article in accordance with claim 4 wherein said solid substrate is acrylic polymer.
Claim 7
Dependent Claim
13 words
An article in accordance with claim 4 wherein said solid substrate is polyester.
Claim 8
Dependent Claim
14 words
An article in accordance with claim 6 wherein the polyester is poly(diphenylol propane) carbonate.
Claim 9
Dependent Claim
16 words
An article in accordance with claim 6 wherein the polyester is poly(diethylene glycol bis allyl) carbonate.
Claim 10
Dependent Claim
13 words
An article in accordance with claim 4 in the form of a lens.
Claim 11
Dependent Claim
14 words
An article in accordance with claim 8 wherein the lens is an ophthalmic lens.
Claim 12
Dependent Claim
35 words
An article of claim 1 in which the alcohol in the coating composition is present in an amount in the range of 20 to 75 weight percent based on the total weight of the cosolvent.
Claim 13
Dependent Claim
32 words
An article in accordance with claim 11 where in the coating composition, the acid is a water miscible organic acid selected from the group consisting of acetic, formic, propanoic and maleic acid.
Claim 14
Dependent Claim
26 words
An article in accordance with claim 12 wherein the coating composition contains from about 0.05 to 1.5 weight percent of a buffered latent silanol condensation catalyst.
Claim 15
Dependent Claim
13 words
An article in accordance with claim 13 wherein said solid substrate is transparent.
Claim 16
Dependent Claim
14 words
An article in accordance with claim 14 wherein said solid substrate is acrylic polymer.
Claim 17
Dependent Claim
13 words
An article in accordance with claim 14 wherein said solid substrate is polyester.
Claim 18
Dependent Claim
14 words
An article in accordance with claim 16 wherein the polyester is poly(diphenylol propane) carbonate.
Claim 19
Dependent Claim
16 words
An article in accordance with claim 16 wherein the polyester is poly(diethylene glycol bis allyl) carbonate.
Claim 20
Dependent Claim
13 words
An article in accordance with claim 14 in the form of a lens.
Claim 21
Dependent Claim
14 words
An article in accordance with claim 18 wherein the lens is an ophthalmic lens.
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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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |