US4223072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible coating resins from siloxane resins having a very low degree of organic substitution
Assignee: Dow Silicones Corp
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Filing: 1978-12-15
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Granted: 1980-09-16
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Expires: 1998-12-15
Abstract
Abstract Abrasion resistant siloxane resins having a low degree of organic substitution thereby tending to be brittle can be made flexible by including some degree of phenyl substitution into the organic substitution.
Inventors
- 👤 Ronald H. Baney
- 👤 Len A. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:30
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31652; Y10T428/31667; Y10T428/31678; Y10T428/31786
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
145 words
An article comprising a solid substrate coated with a pigment-free aqueous coating composition comprising a dispersion of colloidal silica in a lower aliphatic alcohol-water solution, or in an ether ester of ethylene or propylene glycol-water solution, of the partial condensate of a mixture of silanols 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 and phenyl, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , at least 1 weight percent of the silanol being of the formula phenylSi(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 2.8 to 6.0.
Claim 2
Dependent Claim
145 words
An article comprising a solid substrate coated with a pigment-free aqueous coating composition comprising a dispersion of colloidal silica in a lower aliphatic alcohol-water solution, or in an ether ester of ethylene or propylene glycol-water solution, of the partial condensate of a mixture of silanols 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 and phenyl, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , at least 1 weight percent of the silanol being of the formula phenylSi(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 2.8 to 6.0.
Claim 3
Dependent Claim
31 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
14 words
An article in accordance with claim 1 wherein the substrate is a metal substrate.
Claim 13
Dependent Claim
25 words
An article as claimed in claim 11 wherein the metal substrate is selected from a group consisting of silver, copper, aluminum, titanium and stainless steel.
Claim 14
Dependent Claim
12 words
An article as claimed in claim 1 wherein the coating is cured.
References Cited (Backward Citations)
US3986997A
Cited
US4027073A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |