US3884866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength organopolysiloxane compositions
Assignee: General Electric Co
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Filing: 1973-04-13
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Granted: 1975-05-20
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Expires: 1993-04-13
Abstract
Abstract There is provided an organopolysiloxane composition combining high strength with exceptionally good elongation, which composition comprises a first component, a mixture of two vinylcontaining polysiloxanes or blends of vinyl-containing polysiloxanes, one of which is a high viscosity polysiloxane or a blend of high viscosity polysiloxanes, the other is a low viscosity polysiloxane or a blend of low viscosity vinylcontaining polysiloxanes, a filler and an effective amount of a platinum catalyst. The second component comprises a hydrogen-containing silane or polysiloxane. When it is desired to cure the composition into an elastomer the first component is mixed with the second component, that is, the hydrogen containing silane or polysiloxane and the mixture is allowed to cure either at room temperature or at elevated temperatures. Part of the total high viscosity vinylcontaining polymer can be mixed with the second component.
Inventors
- 👤 Edward M Jeram
- 👤 Richard A Striker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:30
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/40; A61L27/44; C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0025; C08K5/54; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/02; C08G77/04; C08G77/12; C08G77/20; C08G77/22; C08G77/24; C08G77/70
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
71 words
AN ORGANOPOLUSILOXANE COMPOSITION COMBINING HIGH STRENGTH WITH EXCEPTIONALLY GOOD ELONGATION COMPRISING (A) 100 PARTS OF A COMBINATION OF INGREDIENTS HAVING THEREIN (I) 20 TO 90 PARTS OF A POLYMER SELECTED FROM THE CLASS CONSISTING OF A VINYL- CONTAINING HIGH VISCOSITY ORGANOPOLYSILOXANE AND A BLEND OF VINYL-CONTAINING HIGH VISCOSITY ORGANOPOLYSILOXANES HAVING NO MORE THAB 25 MOLE PERCENT PHENYL RADICALS HAVING A VISCOSITY OF 5,000 TO 1,000,000 CENTIPOISE AT 25*C OF THE FORMULA,
Claim 2
Dependent Claim
71 words
AN ORGANOPOLUSILOXANE COMPOSITION COMBINING HIGH STRENGTH WITH EXCEPTIONALLY GOOD ELONGATION COMPRISING (A) 100 PARTS OF A COMBINATION OF INGREDIENTS HAVING THEREIN (I) 20 TO 90 PARTS OF A POLYMER SELECTED FROM THE CLASS CONSISTING OF A VINYL- CONTAINING HIGH VISCOSITY ORGANOPOLYSILOXANE AND A BLEND OF VINYL-CONTAINING HIGH VISCOSITY ORGANOPOLYSILOXANES HAVING NO MORE THAB 25 MOLE PERCENT PHENYL RADICALS HAVING A VISCOSITY OF 5,000 TO 1,000,000 CENTIPOISE AT 25*C OF THE FORMULA,
Claim 3
Dependent Claim
66 words
The composition of claim 1 wherein the hydrogen containing polysiloxane is a polysiloxane resin having therein H(R3)2SiO1/2 units and SiO2 units where the ratio of monofunctional units to tetrafunctional units may vary from 0.5:1 to 10:1, the hydroxyl content of the resin is less than 0.5 weight percent and R3 is selected from the class consisting of hydrogen, monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals.
Claim 4
Dependent Claim
12 words
The composition of claim 1 wherein the hydrogen-containing polysiloxane has the formula,
Claim 5
Dependent Claim
32 words
The composition of claim 1 wherein both (A) and (B) are dissolved in an organic solvent selected from the class consisting of heptane, hexane, pentane, octane, cyclohexane, toluene, xylene, benzene and acetone.
Claim 6
Dependent Claim
34 words
The composition of claim 1 wherein in the high viscosity vinyl containing organopolysiloxane R1 and R are methyl, R2 is phenyl, x varies from 500 to 2000 and y varies from 0 to 100.
Claim 7
Dependent Claim
46 words
The composition of claim 1 wherein in the low viscosity vinyl containing organopolysiloxane, R1 is selected from the class consisting of vinyl and methyl, R'''' is methyl, R is methyl, R2 is phenyl, w varies from 50 to 300 and z varies from 0 to 100.
Claim 8
Dependent Claim
67 words
The composition of claim 1 whErein the filler is a filler that has been treated and is selected from the class consisting of titanium dioxide, lithopone, zinc oxide, zirconium silicate, silica aerogel, iron oxide, diatomaceous earth, calcium carbonate, fumed silica, silazane treated silica, precipitated silica, glass fibers, magnesium oxide, chromic oxide, zirconium oxide, aluminum oxide, alpha quartz, calcined clay, asbestos, carbon, graphite, cork, cotton and synthetic fibers.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |