US4539351A
Expired / Lapsed
US
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Silicone resin coating composition with improved shelf life
Assignee: General Electric Co
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Filing: 1985-01-17
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Granted: 1985-09-03
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Expires: 2005-01-17
Abstract
Abstract A silicone resin coating composition with improved shelf life is disclosed herein. A coating composition having a basic pH in the range of from 7.1-7.8 and prepared by hydrolyzing an alkyltrialkoxysilane or aryltrialkoxysilane in an aqueous colloidal silica dispersion is diluted to 10-15% solids. A compatible thickening agent is then added.
Inventors
- 👤 William J. O'Malley
- 👤 Howard A. Vaughn, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:57
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
134 words
An aqueous coating composition having improved room temperature shelf life comprising a dispersion of colloidal silica in an aliphatic alcohol-water solution of the partial condensate of a silanol of the formula RSi(OH) 3 , wherein R is selected from the group consisting of alkyl having from 1 to 3 carbon atoms and aryl, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , said composition adjusted to 10 to 15 weight percent solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate by dilution with an aliphatic alcohol or mixture of alcohols, said composition further containing from about 75 to about 750 ppm by weight of a thickening agent, said composition having a pH of 7.1 to about 7.8.
Claim 2
Dependent Claim
134 words
An aqueous coating composition having improved room temperature shelf life comprising a dispersion of colloidal silica in an aliphatic alcohol-water solution of the partial condensate of a silanol of the formula RSi(OH) 3 , wherein R is selected from the group consisting of alkyl having from 1 to 3 carbon atoms and aryl, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 , said composition adjusted to 10 to 15 weight percent solids consisting essentially of 10 to 70 weight percent colloidal silica and 30 to 90 weight percent of the partial condensate by dilution with an aliphatic alcohol or mixture of alcohols, said composition further containing from about 75 to about 750 ppm by weight of a thickening agent, said composition having a pH of 7.1 to about 7.8.
Claim 3
Dependent Claim
25 words
A coating composition as defined in claim 1 wherein said thickening agent is selected from the group consisting of hydroxypropyl cellulose and hydroxypropyl guar gum.
Claim 4
Dependent Claim
19 words
A coating composition as defined in claim 1 wherein the aliphatic alcohol is a mixture of methanol and isopropanol.
Claim 5
Dependent Claim
15 words
A coating composition as defined in claim 3 wherein the alcohol mixture additionally contains isobutanol.
Claim 6
Dependent Claim
19 words
A coating composition as defined in claim 1 wherein said partial condensate is of CH 3 Si(OH) 3 .
Claim 7
Dependent Claim
24 words
A coating composition as defined in claim 1 containing from about 0.05 to about 0.5 weight percent of a buffered latent silanol condensation catalyst.
Claim 8
Dependent Claim
14 words
A coating composition as defined in claim 5 wherein said catalyst is sodium acetate.
Claim 9
Dependent Claim
14 words
A coating composition as defined in claim 5 wherein said catalyst is tetramethylammonium acetate.
Claim 10
Dependent Claim
16 words
A coating composition as defined in claim 1 wherein the pH is 7.2 to about 7.8.
Claim 11
Dependent Claim
41 words
A coating composition as defined in claim 1 wherein the composition contains from about 10 to about 15 weight percent solids consisting essentially of 25 to 45 weight percent colloidal silica and 55 to 75 weight percent of the partial condensate.
Claim 12
Dependent Claim
19 words
A coating composition as defined in claim 9 wherein the partial condensate is of CH 3 Si(OH) 3 .
Claim 13
Dependent Claim
54 words
A coating composition as defined in claim 1 wherein the composition contains about 10 weight percent solids, the partial condensate is of CH 3 Si(OH) 3 , the aliphatic alcohol is a mixture of methanol and isopropanol and said thickening agent is selected from the group consisting of hydroxypropyl cellulose and hydroxypropyl guar gum.
Claim 14
Dependent Claim
113 words
An aqueous coating composition having improved room temperature shelf life prepared by admixing an aqueous colloidal silica dispersion with a solution of an alkyltriacetoxysilane in an alkyltrialkoxysilane, maintaining the temperature of the admixture at from about 20° C. to about 30° C. for a sufficient time to reduce the reaction mixture to one liquid phase, maintaining the pH of the composition in the range of from about 7.1 to about 7.8, adjusting the solids content of the reaction mixture to about 10 to 15 weight percent by the addition of an aliphatic alcohol thereto, and thereafter adding from about 75 to about 750 ppm by weight of a thickening agent to the admixture.
Claim 15
Dependent Claim
113 words
An aqueous coating composition having improved room temperature shelf life prepared by admixing an aqueous colloidal silica dispersion with a solution of an alkyltriacetoxysilane in an alkyltrialkoxysilane, maintaining the temperature of the admixture at from about 20° C. to about 30° C. for a sufficient time to reduce the reaction mixture to one liquid phase, maintaining the pH of the composition in the range of from about 7.1 to about 7.8, adjusting the solids content of the reaction mixture to about 10 to 15 weight percent by the addition of an aliphatic alcohol thereto, and thereafter adding from about 75 to about 750 ppm by weight of a thickening agent to the admixture.
Claim 16
Dependent Claim
24 words
An aqueous coating composition as defined in claim 13 wherein said alkyltrialkoxysilane is methyltrimethoxysilane, said alkyl(triacetoxy)silane is methyl(triacetoxy)silane and said aliphatic alcohol is isopropanol.
Claim 17
Dependent Claim
34 words
An aqueous coating composition as defined in claim 13 wherein said aqueous colloidal silica dispersion has a basic pH, an average particle size of about 12 millimicrons and an alkali content of about 0.10%.
Claim 18
Dependent Claim
17 words
A solid substrate having at least one surface coated with the aqueous coating composition of claim 1.
Claim 19
Dependent Claim
18 words
An article as defined in claim 15 wherein the solid substrate is comprised of a synthetic organic polymer.
Claim 20
Dependent Claim
14 words
An article as defined in claim 16 wherein said polymer is a transparent polymer.
Claim 21
Dependent Claim
13 words
An article as defined in claim 17 wherein said polymer is a polycarbonate.
Claim 22
Dependent Claim
12 words
An article as defined in claim 18 wherein said polycarbonate is transparent.
Claim 23
Dependent Claim
14 words
An article as defined in claim 18 wherein said polycarbonate is a poly(bisphenol-A carbonate).
Claim 24
Dependent Claim
13 words
An article as defined in claim 16 wherein said polymer is a polymethylmethacrylate.
Claim 25
Dependent Claim
12 words
An article as defined in claim 21 wherein said polymethylmethacrylate is transparent.
Claim 26
Dependent Claim
22 words
An article as defined in claim 15 wherein the aqueous coating composition has been cured on said surface of said solid substrate.
Claim 27
Dependent Claim
34 words
An article as defined in claim 15 wherein said surface of said solid substrate has been primed with a primer composition prior to having been coated with the aqueous coating composition of claim 1.
Claim 28
Dependent Claim
18 words
An article as defined in claim 24 wherein said primer composition is comprised of a thermosetting acrylic emulsion.
Claim 29
Dependent Claim
18 words
An article as defined in claim 24 wherein said primer composition is comprised of a thermoplastic acrylic composition.
Claim 30
Dependent Claim
37 words
An article as defined in claim 24 wherein said primer composition is comprised of an ethanol-isobutanol solution containing 1.5 weight percent of gamma-aminopropyltriethoxysilane and 1.5 weight percent of a preformed reaction product of gamma-aminopropyltriethoxysilane and maleic anhydride.
Claim 31
Dependent Claim
113 words
An aqueous coating composition having improved room temperature shelf life prepared by admixing an aqueous colloidal silica dispersion with a solution of acetic acid in an alkyltrialkoxysilane, maintaining the temperature of the admixture at from about 20° C. to about 30° C. for a sufficient time to reduce the reaction mixture to one liquid phase, maintaining the pH of the composition in the range of from about 7.1 to about 7.8, adjusting the solids content of the reaction mixture to about 10 to 15 weight percent by the addition of an aliphatic alcohol thereto, and thereafter adding from about 75 to about 750 ppm by weight of a thickening agent to the admixture.
Claim 32
Dependent Claim
113 words
An aqueous coating composition having improved room temperature shelf life prepared by admixing an aqueous colloidal silica dispersion with a solution of acetic acid in an alkyltrialkoxysilane, maintaining the temperature of the admixture at from about 20° C. to about 30° C. for a sufficient time to reduce the reaction mixture to one liquid phase, maintaining the pH of the composition in the range of from about 7.1 to about 7.8, adjusting the solids content of the reaction mixture to about 10 to 15 weight percent by the addition of an aliphatic alcohol thereto, and thereafter adding from about 75 to about 750 ppm by weight of a thickening agent to the admixture.
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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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |