US3944702A
Expired / Lapsed
US
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Fibrous structures bonded with a silsesquioxane-containing composition
Assignee: Dow Silicones Corp
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Filing: 1974-06-24
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Granted: 1976-03-16
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Expires: 1994-06-24
Abstract
Abstract A binder composition of colloidal silica and silsesquioxane polymer (RSiO 3 / 2 ) is applied to fibrous masses from an acidified water-alcohol vehicle to fabricate coherent three-dimensional structures, such as bonded asbestos mats.
Inventors
- 👤 Harold A. Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:28
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/641; D04H1/587; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2962; Y10T428/2964; Y10T442/00; Y10T442/60
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
94 words
A coherent three-dimensional structure comprising a plurality of contiguous fibers, said fibers being bonded at their points of contact with a composition consisting essentially of 10 to 75 weight percent colloidal silica uniformly dispersed in a matrix of 25 to 90 weight RSiO 3 / 2 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 matrix being CH 3 SiO 3 / 2 .
Claim 2
Dependent Claim
94 words
A coherent three-dimensional structure comprising a plurality of contiguous fibers, said fibers being bonded at their points of contact with a composition consisting essentially of 10 to 75 weight percent colloidal silica uniformly dispersed in a matrix of 25 to 90 weight RSiO 3 / 2 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 matrix being CH 3 SiO 3 / 2 .
Claim 3
Dependent Claim
19 words
A structure in accordance witn claim 1 wherein said matrix portion is CH 3 SiO 3 / 2 .
Claim 4
Dependent Claim
27 words
A structure in accordance witn claim 2 wherein the fibers are selected from the group consisting of cellulosic fibers, inorganic fibers, synthetic polymeric fibers, and metallic fibers.
Claim 5
Dependent Claim
13 words
A structure in accordance with claim 3 wherein the fibers are inorganic fibers.
Claim 6
Dependent Claim
13 words
A structure in accordance with claim 4 wherein the fibers are glass fibers.
Claim 7
Dependent Claim
20 words
A structure in accordance with claim 1 wherein the binder composition comprises 3 to 25 weight percent of the structure.
Claim 8
Dependent Claim
87 words
A structure in accordance with claim 1 comprising a plurality of glass fibers in the form of a nonwoven mat, said fibers being bonded at their points of contact with a composition consisting essentially of about 30 to 50 weight percent of colloidal silica dispersed in a matrix of about 50 to 70 weight percent CH 3 SiO 3 / 2 , said composition being present in an amount in the range of from 3 to 25 weight percent, based on the total weight of the structure.
Claim 9
Independent Claim
153 words
A method of fabricating a coherent three-dimensional structure comprising coating a plurality of contiguous fibers with sufficient binder composition to bond said fibers at their points of contact; said binder composition consisting essentially of a dispersion of colloidal silica in a 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 gammamethacryloxypropyl radical, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 said composition containing 1 to 40 weight percent solids consisting essentially of 10 to 75 weight percent colloidal silica and 25 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; and thereafter curing said partial condensate.
Claim 10
Independent Claim
153 words
A method of fabricating a coherent three-dimensional structure comprising coating a plurality of contiguous fibers with sufficient binder composition to bond said fibers at their points of contact; said binder composition consisting essentially of a dispersion of colloidal silica in a 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 gammamethacryloxypropyl radical, at least 70 weight percent of the silanol being CH 3 Si(OH) 3 said composition containing 1 to 40 weight percent solids consisting essentially of 10 to 75 weight percent colloidal silica and 25 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; and thereafter curing said partial condensate.
Claim 11
Dependent Claim
21 words
A method of claim 8 wherein the curing is effected at elevated temperatures in the range of from 75° to 125°C.
Claim 12
Dependent Claim
17 words
A method of claim 8 wherein the partial condensate is that of CH 3 Si(OH) 3 .
Claim 13
Dependent Claim
23 words
A method of claim 8 wherein the binder composition contains from 0.1 to 1.5 weight percent of a buffered latent silanol condensation catalyst.
Claim 14
Dependent Claim
19 words
A method in accordance with claim 11 wherein the catalyst is an alkali metal salt of a carboxylic acid.
Claim 15
Dependent Claim
13 words
A method in accordance with claim 12 wherein the catalyst is sodium acetate.
Claim 16
Dependent Claim
26 words
A method in accordance with claim 8 wherein the acid is selected from the group consisting of acetic acid, formic acid, propionic acid and maleic acid.
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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) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |