Patent US4401491A successfully refreshed from Google Patents.
US4401491A
Expired / Lapsed
US
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Solid silicone rubber compositions as insulators from fire for electrical components
Assignee: General Electric Co
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Filing: 1981-04-17
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Granted: 1983-08-30
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Expires: 2001-04-17
Abstract
Abstract A process for insulating electrical components located in a conduit from fire comprising mixing and pouring into the conduit a composition comrising a vinyl-containing polysiloxane polymer, an extending filler which is preferably alpha quartz, a platinum catalyst and a hydrogen-containing polysiloxane. The composition is allowed to surround the electrical components in the conduit and cured at room temperature to a solid silicone elastomer. Such a process has been found imminently suitable for insulating electrical components in a nuclear plant from fire for an extended period of time so as to maintain the electrical integrity of the components.
Inventors
- 👤 Frank J. Modic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:30
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/29; H01B7/295; A; A62; A62C; A62C3/00; A62C3/16; C; C08; C08L; C08L83/00; C08L83/04; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4429; G02B6/44382; H01B3/00; H01B3/18; H01B3/30; H01B3/46; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20; C08G77/70; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
192 words
A process for insulating electrical components located in a conduit from fire with a silicone composition wherein the silicone composition conducts away the heat generated by the electric current in the electrical component at a sufficient rate, comprising the steps of: (1) mixing a curable silicone composition having (A) 100 parts of a vinyl-containing diorganopolysiloxane polymer having a viscosity varying from 100 to 100,000 centipoise at 25° C., a vinyl content varying from 0.0004 to 1% by weight wherein the organo groups are monovalent hydrocarbon radicals; (B) from 50 to 300 parts by weight of an extending filler; (C) from 0 to 100 parts by weight of a reinforcing silica filler; (D) from 1 to 200 parts per million of a platinum catalyst; and (E) from 0.5 to 30 parts by weight of a hydrogen containing polysiloxane having from 0.4 to 1.6% by weight of hydrogen and a viscosity varying from 1 to 500 centipoise at 25° C., thereby forming a curable mixture; (2) placing said curable mixture in said conduit so as to fill the space surrounding said electrical components; and (3) allowing the curable composition to cure at room temperature.
Claim 2
Dependent Claim
192 words
A process for insulating electrical components located in a conduit from fire with a silicone composition wherein the silicone composition conducts away the heat generated by the electric current in the electrical component at a sufficient rate, comprising the steps of: (1) mixing a curable silicone composition having (A) 100 parts of a vinyl-containing diorganopolysiloxane polymer having a viscosity varying from 100 to 100,000 centipoise at 25° C., a vinyl content varying from 0.0004 to 1% by weight wherein the organo groups are monovalent hydrocarbon radicals; (B) from 50 to 300 parts by weight of an extending filler; (C) from 0 to 100 parts by weight of a reinforcing silica filler; (D) from 1 to 200 parts per million of a platinum catalyst; and (E) from 0.5 to 30 parts by weight of a hydrogen containing polysiloxane having from 0.4 to 1.6% by weight of hydrogen and a viscosity varying from 1 to 500 centipoise at 25° C., thereby forming a curable mixture; (2) placing said curable mixture in said conduit so as to fill the space surrounding said electrical components; and (3) allowing the curable composition to cure at room temperature.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein said extending filler is selected from the class consisting of alpha quartz, calcium cabonate, titanium dioxide, iron oxide and mixtures thereof.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein there is present in the composition from 0.1 to 10 parts of carbon black.
Claim 5
Dependent Claim
42 words
The process of claim 1 wherein there is present in the composition from 1 to 50 parts per million of a platinum catalyst which is a complex of platinum and compound selected from the class consisting of ethers, aliphatic alcohols and aldehydes.
Claim 6
Dependent Claim
31 words
The process of claim 1 wherein there is present in the composition from 1 to 50 parts per million of a platinum catalyst complex which is platinum combined with a vinylpolysiloxane.
Claim 7
Dependent Claim
59 words
The process of claim 1 wherein the vinyl-containing diorganopolysiloxane polymer has the formula, ##STR3## where R is selected from the class consisting of aliphatically saturated monovalent hydrocarbon radicals and aromatic hydrocarbon radicals, R 1 is a monovalent hydrocarbon radical and x, y vary such that the viscosity of the polymer varies from 100 to 100,000 centipoise at 25° C.
Claim 8
Dependent Claim
55 words
The process of claim 1 wherein the hydride polysiloxane has the formula, ##STR4## where R 2 is a monovalent hydrocarbon radical R 3 is selected from the class consisting of hydrogen and monovalent hydrocarbon radicals and p, q vary such that the polymer has a viscosity varying from 1 to 500 centipoise at 25° C.
Claim 9
Dependent Claim
27 words
The process of claim 1 further comprising the step of conducting away from the cured composition the heat generated by an electric current in the electrical component.
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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |