US4544696A
Expired / Lapsed
US
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Silicone elastomers having thermally conductive properties
Assignee: Wacker Chemical Corp
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Filing: 1984-10-29
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Granted: 1985-10-01
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Expires: 2004-10-29
Abstract
Abstract Silicone elastomers having thermally conductive properties which comprise an organopolysiloxane having Si-bonded aliphatically unsaturated groups, an organohydrogenpolysiloxane having Si-bonded hydrogen atoms, a catalyst capable of promoting the addition of Si-bonded hydrogen to Si-bonded aliphatically unsaturated groups and from about 30 to 95 percent by weight of filler, based on the weight of the composition, of which at least 10 percent by weight of the filler is silicon nitride particles.
Inventors
- 👤 Marie J. Streusand
- 👤 John C. Getson
- 👤 Richard C. McAfee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:25
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
90 words
A thermally conductive organopolysiloxane composition comprising (a) an organopolysiloxane having an average of at least two aliphatically unsaturated hydrocarbon radicals per molecule, (b) an organohydrogenpolysiloxane having an average of at least two Si-bonded hydrogen atoms per molecule, (c) a catalyst capable of promoting the addition of the Si-bonded hydrogen atoms to the aliphatically unsaturated hydrocarbon radicals and (d) from about 30 to 95 percent by weight of filler based on the weight of the composition, of which at least 10 percent by weight of the filler is silicon nitride particles.
Claim 2
Dependent Claim
90 words
A thermally conductive organopolysiloxane composition comprising (a) an organopolysiloxane having an average of at least two aliphatically unsaturated hydrocarbon radicals per molecule, (b) an organohydrogenpolysiloxane having an average of at least two Si-bonded hydrogen atoms per molecule, (c) a catalyst capable of promoting the addition of the Si-bonded hydrogen atoms to the aliphatically unsaturated hydrocarbon radicals and (d) from about 30 to 95 percent by weight of filler based on the weight of the composition, of which at least 10 percent by weight of the filler is silicon nitride particles.
Claim 3
Dependent Claim
30 words
The composition of claim 1, wherein the silicon nitride particles are present in an amount of from 30 to 100 percent by weight based on the weight of the filler.
Claim 4
Dependent Claim
10 words
The composition of claim 1, wherein the catalyst is platinum.
Claim 5
Dependent Claim
85 words
The composition of claim 1, wherein the organopolysiloxane (a) having aliphatically unsaturated hydrocarbon radicals has recurring units of the formula R.sub.x SiO.sub.(4-x)/2, where R is selected from the group consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals having from 1 to 18 carbon atoms, in which an average of at least two of the monovalent hydrocarbon radicals per molecule contain aliphatic unsaturation and x is an integer of from 1 to 3, with an average value of from about 1.7 to about 2.1.
Claim 6
Dependent Claim
21 words
The composition of claim 4, wherein the organopolysiloxane (a) has a viscosity of from 5 to 500,000 mPa.s at 25° C.
Claim 7
Dependent Claim
56 words
The composition of claim 1, wherein the organohydrogenpolysiloxane (b) has the formula R'.sub.m SiO.sub.(4-m)/2, where R' is selected from the group consisting of hydrogen, a monovalent hydrocarbon radical and a halogenated monovalent hydrocarbon radical, in which an average of at least two Si-bonded hydrogen atoms are present per molecule and m is 1, 2 or 3.
Claim 8
Dependent Claim
20 words
The composition of claim 6, wherein the organohydrogenpolysiloxane has a viscosity of from 10 to 50,000 mPa.s at 25° C.
Claim 9
Dependent Claim
17 words
The composition of claim 1, wherein the composition contains an inhibitor which inhibits the catalyst addition reaction.
Claim 10
Dependent Claim
12 words
The composition of claim 1, wherein the organopolysiloxane composition contains additional filler.
Claim 11
Dependent Claim
96 words
A process for preparing a thermally conductive elastomer which comprises mixing (a) an organopolysiloxane having an average of at least two aliphatically unsaturated hydrocarbon radicals per molecule with (b) an organohydrogenpolysiloxane having an average of at least two Si-bonded hydrogen atoms per molecule, (c) a catalyst capable of promoting the addition of the Si-bonded hydrogen atoms to the aliphatically unsaturated hydrocarbon radicals and (d) from about 30 to 95 percent by weight of filler based on the weight of the composition, of which at least 10 percent by weight of the filler is silicon nitride particles.
Claim 12
Dependent Claim
96 words
A process for preparing a thermally conductive elastomer which comprises mixing (a) an organopolysiloxane having an average of at least two aliphatically unsaturated hydrocarbon radicals per molecule with (b) an organohydrogenpolysiloxane having an average of at least two Si-bonded hydrogen atoms per molecule, (c) a catalyst capable of promoting the addition of the Si-bonded hydrogen atoms to the aliphatically unsaturated hydrocarbon radicals and (d) from about 30 to 95 percent by weight of filler based on the weight of the composition, of which at least 10 percent by weight of the filler is silicon nitride particles.
Claim 13
Dependent Claim
30 words
The process of claim 10, wherein the silicon nitride particles are present in an amount of from 30 to 100 percent by weight based on the weight of the filler.
Claim 14
Dependent Claim
10 words
The process of claim 10, wherein the catalyst is platinum.
Claim 15
Dependent Claim
17 words
The process of claim 10, wherein the composition contains an inhibitor which inhibits the catalyst addition reaction.
Claim 16
Dependent Claim
16 words
The process of claim 10, wherein the composition is heated to a temperature above 50° C.
Claim 17
Dependent Claim
18 words
The process of claim 14, wherein the composition is heated to a temperature sufficient to volatilize the inhibitor.
Claim 18
Dependent Claim
11 words
The elastomer prepared in accordance with the process of claim 10.
Claim 19
Dependent Claim
11 words
The elastomer prepared in accordance with the process of claim 14.
References Cited (Backward Citations)
US4255316A
Cited
US4472591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |