US4277525A
Expired / Lapsed
US
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Liquid compositions for forming silica coating films
Assignee: Tokyo Ohka Kogyo Co Ltd
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Filing: 1980-03-24
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Granted: 1981-07-07
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Expires: 2000-03-24
Abstract
Abstract Liquid compositions suitable for providing silica-based coating films on to various substrate surfaces are prepared by the reaction of an alkoxy-containing silane, a lower carboxylic acid and an alcohol in the presence of a reaction accelerator which is an organic acid different from the above mentioned lower carboxylic acid. The reaction proceeds very smoothly even in the absence of any halogen-containing compounds, and the resultant liquid coating compositions are free from the problem of corrosion due to the presence of a halogen-containing ingredient.
Inventors
- 👤 Muneo Nakayama
- 👤 Toshihiro Nishimura
- 👤 Hisashi Nakane
- 👤 Shozo Toda
- 👤 Yoshio Hotta
- 👤 Mitsuaki Minato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:47
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/14; C09D183/02; C09D183/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
142 words
A liquid coating composition for forming silica-based coating films which comprises a product obtained by the reaction of a reaction mixture composed of (a) an alkoxysilane represented by the general formula R.sup.1.sub.n Si(OR.sup.2)4-n, where R 1 and R 2 are each a hydrocarbon group selected from the class consisting of methyl, ethyl, propyl, butyl, vinyl and phenyl groups and n is zero or 1; (b) from 2 to 5 moles per mole of the alkoxysilane of a lower carboxylic acid containing 2 to 7 carbon atoms and having a dissociation index pK a larger than 4.0, or an anhydride thereof; and (c) from 2 to 10 moles per mole of the alkoxysilane of an alcohol containing 1 to 4 carbon atoms; in the presence of a reaction accelerator which is an organic acid having a dissociation index pK a up to 4.0.
Claim 2
Dependent Claim
142 words
A liquid coating composition for forming silica-based coating films which comprises a product obtained by the reaction of a reaction mixture composed of (a) an alkoxysilane represented by the general formula R.sup.1.sub.n Si(OR.sup.2)4-n, where R 1 and R 2 are each a hydrocarbon group selected from the class consisting of methyl, ethyl, propyl, butyl, vinyl and phenyl groups and n is zero or 1; (b) from 2 to 5 moles per mole of the alkoxysilane of a lower carboxylic acid containing 2 to 7 carbon atoms and having a dissociation index pK a larger than 4.0, or an anhydride thereof; and (c) from 2 to 10 moles per mole of the alkoxysilane of an alcohol containing 1 to 4 carbon atoms; in the presence of a reaction accelerator which is an organic acid having a dissociation index pK a up to 4.0.
Claim 3
Dependent Claim
13 words
The liquid coating composition as claimed in claim 1 wherein n is zero.
Claim 4
Dependent Claim
32 words
The liquid coating composition as claimed in claim 1 wherein the lower carboxylic acid is selected from the group consisting of acetic acid, propionic acid, butyric acid, valeric acid and caproic acid.
Claim 5
Dependent Claim
18 words
The liquid coating composition as claimed in claim 1 wherein the alcohol is methyl alcohol or ethyl alcohol.
Claim 6
Dependent Claim
22 words
The liquid coating composition as claimed in claim 1 wherein the reaction accelerator is a carboxylic acid or an organic sulfonic acid.
Claim 7
Dependent Claim
37 words
The liquid coating composition as claimed in claim 5 wherein the carboxylic acid is selected from the class consisting of formic acid, oxalic acid, citric acid, malonic acid, salicylic acid, picric acid, phthalic acid and maleic acid.
Claim 8
Dependent Claim
28 words
The liquid coating composition as claimed in claim 5 wherein the organic sulfonic acid is selected from the class consisting of benzenesulfonic acid, toluenesulfonic acid and naphthalenesulfonic acid.
Claim 9
Dependent Claim
33 words
The liquid coating composition as claimed in claim 1 wherein the amount of the reaction accelerator is in the range from 0.1 to 20% by weight based on the amound of the alkoxysilane.
Claim 10
Dependent Claim
21 words
The liquid coating composition as claimed in claim 1 wherein the reaction is conducted at a temperature up to 50° C.
Claim 11
Dependent Claim
36 words
The liquid coating composition as claimed in claim 1 wherein the amount of the lower carboxylic acid in the product of the reaction is less than 20% of the amount of the same before the reaction.
Claim 12
Dependent Claim
17 words
A mixture comprising a liquid coating composition as claimed in claim 1 together with a glass-forming agent.
Claim 13
Dependent Claim
19 words
A mixture comprising a liquid coating composition as claimed in claim 1 together with an organic polymer film-forming agent.
Claim 14
Independent Claim
178 words
A method for the preparation of a liquid coating composition for forming silica-based coating films which comprises mixing a reaction accelerator which is an organic acid having a dissociation index pK a up to 4.0 with a reaction mixture composed of (a) an alkoxysilane represented by the general formula R.sup.1.sub.n Si(OR.sup.2)4-n, where R 1 and R 2 are each a hydrocarbon group selected from the class consisting of methyl, ethyl, propyl, butyl, vinyl and phenyl groups and n is zero or 1; (b) from 2 to 5 moles per mole of the alkoxysilane of a lower carboxylic acid containing 2 to 7 carbon atoms and having a dissociation index pK a larger than 4.0, or an anhydride thereof; and (c) from 2 to 10 moles per mole of the alkoxysilane of an alcohol containing 1 to 4 carbon atoms; and reacting the components (a), (b) and (c) above to such an extent that the amount of the lower carboxylic acid in the resulting reaction mixture is less than 20% of the amount initially present in the reaction mixture.
Claim 15
Independent Claim
178 words
A method for the preparation of a liquid coating composition for forming silica-based coating films which comprises mixing a reaction accelerator which is an organic acid having a dissociation index pK a up to 4.0 with a reaction mixture composed of (a) an alkoxysilane represented by the general formula R.sup.1.sub.n Si(OR.sup.2)4-n, where R 1 and R 2 are each a hydrocarbon group selected from the class consisting of methyl, ethyl, propyl, butyl, vinyl and phenyl groups and n is zero or 1; (b) from 2 to 5 moles per mole of the alkoxysilane of a lower carboxylic acid containing 2 to 7 carbon atoms and having a dissociation index pK a larger than 4.0, or an anhydride thereof; and (c) from 2 to 10 moles per mole of the alkoxysilane of an alcohol containing 1 to 4 carbon atoms; and reacting the components (a), (b) and (c) above to such an extent that the amount of the lower carboxylic acid in the resulting reaction mixture is less than 20% of the amount initially present in the reaction mixture.
Claim 16
Dependent Claim
44 words
A method for forming a silica-based coating film on a substrate which comprises coating the substrate with a liquid coating composition of claim 1, drying the liquid coating composition and heating the thus dried coating composition at a temperature of at least 150° C.
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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) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |