US4239668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organothiol-containing siloxane resins
Assignee: Dow Silicones Corp
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Filing: 1978-11-20
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Granted: 1980-12-16
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Expires: 1998-11-20
Abstract
Abstract What is disclosed is a composition of matter which is an aqueous dispersion of an organothiolsilsesquioxane and colloidal silica which is useful as an adhesion promoter for siloxane resins which have a low degree of substitution.
Inventors
- 👤 Harold A. Clark
- 👤 Loren A. Haluska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:36
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; C09D183/08; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
A pigment-free aqueous composition consisting essentially of a dispersion of colloidal silica in lower aliphatic alcohol-water solution, or a dispersion of colloidal silica in ether-esters of ethylene or propylene glycol-water solution, of a partial condensate of a silanol of the formula RSi(OH) 3 in which R is selected from HSR'-- and (HS) 2 R'-- wherein R' is selected from a group consisting of a divalent or trivalent aliphatic hydrocarbon radical having 1-6 carbon atoms and phenylene, the colloidal silica being present in the amount of 34 to 50 weight percent and the amount of RSi(OH) 3 being 50 to 66 weight percent both being based on the total solids in the composition, said composition containing 10-50 weight percent solids, said composition containing sufficient acid to provide a pH in the range of 2.5 to 5.5.
Claim 2
Dependent Claim
135 words
A pigment-free aqueous composition consisting essentially of a dispersion of colloidal silica in lower aliphatic alcohol-water solution, or a dispersion of colloidal silica in ether-esters of ethylene or propylene glycol-water solution, of a partial condensate of a silanol of the formula RSi(OH) 3 in which R is selected from HSR'-- and (HS) 2 R'-- wherein R' is selected from a group consisting of a divalent or trivalent aliphatic hydrocarbon radical having 1-6 carbon atoms and phenylene, the colloidal silica being present in the amount of 34 to 50 weight percent and the amount of RSi(OH) 3 being 50 to 66 weight percent both being based on the total solids in the composition, said composition containing 10-50 weight percent solids, said composition containing sufficient acid to provide a pH in the range of 2.5 to 5.5.
Claim 3
Dependent Claim
14 words
A solid substrate containing on its surface a composition as claimed in claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |