US3628985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organopolysiloxane impregnated fibrous sheet and method of producing same
Assignee: OI Glass Inc
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Filing: 1969-06-10
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Granted: 1971-12-21
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Expires: 1989-06-10
Abstract
Abstract A fibrous web impregnated with an organopolysiloxane which is cured thereon, wherein the web has superior dielectric and heatresistant properties and is useful as an insulating medium and, optionally, a rigid fibrous web having its resin and/or fiber portion carbonized. A process of impregnating the fibrous web with the organopolysiloxane in liquid or powder form and curing the siloxane thereon, and, optionally, carbonizing the resin and/or fiber portion of the web whereby the resulting carbonized structure retains its rigidity.
Inventors
- 👤 Shibley A Hider
- 👤 Walter Kitaj
- 👤 Robert E Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:25
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/48; C; C11; C11D; C11D1/00; C11D1/88; C11D1/94; C11D3/00; C11D3/0005; C11D3/001; C11D3/16; C11D3/37; D; D21; D21J; D21J1/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
18 words
The fibrous sheet of claim 1, wherein the organopolysiloxane is produced by the hydrolysis and condensation of methyltriethoxysilane.
Claim 2
Dependent Claim
23 words
The fibrous sheet of claim 1, wherein the organopolysiloxane Is produced by the hydrolysis and condensation of a mixture of methyltriethoxysilane and phenyltriethoxysilane.
Claim 3
Dependent Claim
52 words
The fibrous sheet of claim 1 comprising a fiber web having fibers selected from the group consisting of pine kraft, groundwood, semichemical hardwood, bleached hardwood sods, Alpha -cellulose, asbestos, glass, or a fiber formed from a polyamide resin, polyester resin, polyolefin resin, acrylic resin, steel, aluminum, copper or brass which is fiber.
Claim 4
Dependent Claim
177 words
A process for the manufacture of an impregnated fibrous sheet which comprises the steps of forming a fiber web, impregnating said web with an organic solution of a further curable organopolysiloxane compound, said further curable organopolysiloxane compound being a precured hydrolysis and condensation product of at least one organosilane monomer selected from the group consisting of methyltrialkoxysilane and a mixture of methyltrialkoxysilane and phenyltrialkoxysilane in which the alkoxy group contains less than five carbon atoms and water at about 50* to 80* C. for a period of from about 1 to about 10 hours to form a siloxane partial condensation product which is then heated at a temperature of about 100* to 300* C. to remove alkanol byproduct and water, after which the resultant product is precured by heating at a temperature below the gel point thereof and in the range of about 90* to about 185* C. to provide the precured, further curable organopolysiloxane, evaporating the solvent for the organopolysiloxane from said solution and finally curing the organopolysiloxane to provide a thermoset organopolysiloxane impregnated fibrous sheet.
Claim 5
Dependent Claim
65 words
The process in accordance with claim 5 wherein said evaporation is carried out at from about 25* to about 185* C., said precure is carried out at a temperature from 10-20* C. below the gel point, and said final cure is carried out at temperature of from about 80* to about 100* C. at a relative humidity of from about 50 to about 100 percent.
Claim 6
Dependent Claim
31 words
A process in accordance with claim 5 wherein the resulting impregnated sheet is subsequently heated to a temperature sufficient to carbonize at least one of the fiber web and resinous matrix.
References Cited (Backward Citations)
US2706190A
Cited
US2893898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |