US4288360A
Expired / Lapsed
US
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Flame resistant silicone rubber compositions and methods
Assignee: General Electric Co
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Filing: 1979-12-26
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Granted: 1981-09-08
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Expires: 1999-12-26
Abstract
Abstract The present invention provides curable organopolysiloxane compositions having improved flame retardant properties, comprising, (1) an organopolysiloxane gum convertible to the cured, solid, elastic state and consisting essentially of silicon atoms, oxygen atoms and organic groups selected from the class consisting of methyl radicals, aromatic radicals selected from the class consisting of aryl and halogenated aryl radicals, vinyl radicals, lower alkyl radicals, lower cyanoalkyl radicals and lower haloalkyl radicals, (2) a finely divided inorganic filler, (3) a platinum compound or platinum and (4) and various effective amounts of hydrated alumina, fumed titanium dioxide, and magnesium oxide.
Inventors
- 👤 William J. Bobear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:24
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K5/00; C08K5/04; C08K5/09; C08K5/14
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
122 words
A composition curable to a silicone rubber exhibiting improved flame retardancy and tear strength comprising: (A) 100 parts by weight of a base compound comprising a polydiorganosiloxane gum or blend of polydiorganosiloxane gums having a viscosity of 1,000,000 to 200,000,000 centipoise at 25° C., and having an average unit formula of R a SIO.sub.(4-a)/2, wherein R is a monovalent substituted or unsubstituted hydrocarbon radical selected from the class consisting of methyl, vinyl and phenyl radicals, a is approximately, 1.98 to 2.05, and wherein approximately, 0 to 5.0 mole percent of the total organic groups are vinyl radicals; (B) 0.01 to 250 ppm platinum; (C) 1.0 to 20 parts by weight hydrated alumina, and (D) 0.001 to 2.0 parts by weight magnesium oxide.
Claim 2
Dependent Claim
122 words
A composition curable to a silicone rubber exhibiting improved flame retardancy and tear strength comprising: (A) 100 parts by weight of a base compound comprising a polydiorganosiloxane gum or blend of polydiorganosiloxane gums having a viscosity of 1,000,000 to 200,000,000 centipoise at 25° C., and having an average unit formula of R a SIO.sub.(4-a)/2, wherein R is a monovalent substituted or unsubstituted hydrocarbon radical selected from the class consisting of methyl, vinyl and phenyl radicals, a is approximately, 1.98 to 2.05, and wherein approximately, 0 to 5.0 mole percent of the total organic groups are vinyl radicals; (B) 0.01 to 250 ppm platinum; (C) 1.0 to 20 parts by weight hydrated alumina, and (D) 0.001 to 2.0 parts by weight magnesium oxide.
Claim 3
Dependent Claim
18 words
The composition as in claim 1, further comprising E, 0.001 to 10 parts by weight fumed titanium dioxide.
Claim 4
Dependent Claim
22 words
The composition as in claim 1, further comprising an amount of organic peroxide effective for curing said composition to a silicone rubber.
Claim 5
Dependent Claim
9 words
The cured product of claims 1, 2 or 3.
Claim 6
Dependent Claim
11 words
The composition as in claim 1, further comprising a process aid.
Claim 7
Dependent Claim
11 words
The composition as in claim 1, further comprising an extending filler.
Claim 8
Dependent Claim
12 words
The composition as in claim 1, further comprising a heat resistant additive.
Claim 9
Dependent Claim
20 words
The composition as in claim 7, wherein said heat resistant additive is selected from rare earth octoate and ferric octoate.
Claim 10
Dependent Claim
126 words
A process for producing a composition curable to a silicone rubber exhibiting improved flame retardancy and tear strength comprising the steps of compounding (A) 100 parts by weight of a base compound comprising a polydiorganosiloxane gum or blend of polydiorganosiloxane gum having a viscosity of 1,000,000 to 200,000,000 centipoise at 25° C. and having an average unit formula of R a SiO.sub.(4-a)/2, wherein R is a monovalent substituted or unsubstituted hydrocarbon radical selected from the class consisting of methyl, vinyl and phenyl radicals, a is approximately 1.982 to 2.05 and wherein there is 0 to 5.0 percent vinyl radicals incorporated therein; (B) 0.01 to 250 ppm platinum; (C) 1.0 to 20 parts by weight hydrated alumina; and (D) 0.001 to 2.0 parts by weight mangesium oxide.
Claim 11
Dependent Claim
126 words
A process for producing a composition curable to a silicone rubber exhibiting improved flame retardancy and tear strength comprising the steps of compounding (A) 100 parts by weight of a base compound comprising a polydiorganosiloxane gum or blend of polydiorganosiloxane gum having a viscosity of 1,000,000 to 200,000,000 centipoise at 25° C. and having an average unit formula of R a SiO.sub.(4-a)/2, wherein R is a monovalent substituted or unsubstituted hydrocarbon radical selected from the class consisting of methyl, vinyl and phenyl radicals, a is approximately 1.982 to 2.05 and wherein there is 0 to 5.0 percent vinyl radicals incorporated therein; (B) 0.01 to 250 ppm platinum; (C) 1.0 to 20 parts by weight hydrated alumina; and (D) 0.001 to 2.0 parts by weight mangesium oxide.
Claim 12
Dependent Claim
23 words
A composition as in claim 9, further comprising compounding (E) 0.001 to 10 parts by weight fumed titanium dioxide into said curable composition.
Claim 13
Dependent Claim
12 words
A process as in claim 9, further comprising adding a process aid.
Claim 14
Dependent Claim
12 words
The process as in claim 9, further comprising adding an extending filler.
Claim 15
Dependent Claim
16 words
The process as in claim 9, further comprising the step of adding a heat resistant additive.
Claim 16
Dependent Claim
20 words
The process as in claim 13, wherein said heat resistant additive is selected from ferric octoate and rear earth octoate.
Claim 17
Dependent Claim
24 words
A process as in claim 9, further comprising the step of adding an organic peroxide effective for curing said composition to a silicone rubber.
Claim 18
Dependent Claim
17 words
A process of claim 15, further comprising the step of curing said composition to a silicone rubber.
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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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |