Patent US4588768A successfully refreshed from Google Patents.
US4588768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally conductive heat curable organopolysiloxane compositions
Assignee: Wacker Chemical Corp
•
Filing: 1984-10-29
•
Granted: 1986-05-13
•
Expires: 2004-10-29
Abstract
Abstract This invention relates to thermally conductive heat curable organopolysiloxane compositions containing from 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
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:43
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A thermally conductive heat curable organopolysiloxane composition comprising an organopolysiloxane having recurring units of the formula ##STR2## where R is selected from the group consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals having from 1 to 18 carbon atoms and n is a number of from 1.7 to 2.2, an organic peroxide vulcanizing agent and from 30 to 95 percent by weight of filler based on the weight of the composition, of which from about 30 to 100 percent by weight based on the weight of the filler is silicon nitride particles.
Claim 2
Dependent Claim
94 words
A thermally conductive heat curable organopolysiloxane composition comprising an organopolysiloxane having recurring units of the formula ##STR2## where R is selected from the group consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals having from 1 to 18 carbon atoms and n is a number of from 1.7 to 2.2, an organic peroxide vulcanizing agent and from 30 to 95 percent by weight of filler based on the weight of the composition, of which from about 30 to 100 percent by weight based on the weight of the filler is silicon nitride particles.
Claim 3
Dependent Claim
16 words
The composition of claim 1, wherein the silicon nitride particles range from 0.5 to 350 microns.
Claim 4
Dependent Claim
16 words
The composition of claim 1, wherein the silicon nitride particles range from 40 to 250 microns.
Claim 5
Dependent Claim
17 words
The composition of claim 1, wherein the organopolysiloxane is a copolymer of a dimethylsiloxane and a methylvinylsiloxane.
Claim 6
Dependent Claim
13 words
The composition of claim 1, wherein the organic peroxide is a dialkyl peroxide.
Claim 7
Independent Claim
108 words
A method for preparing a thermally conductive silicone elastomer which comprises mixing an organopolysiloxane having recurring units of the formula ##STR3## where R is selected from the group consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals having from 1 to 18 carbon atoms and n is a number of from 1.7 to 2.2, an organic peroxide vulcanizing agent and from 30 to 95 percent by weight of filler based on the weight of the composition, of which from about 30 to 100 percent by weight of the filler is silicon nitride particles and thereafter heating the resultant composition to a temperature sufficient to form an elastomer.
Claim 8
Independent Claim
108 words
A method for preparing a thermally conductive silicone elastomer which comprises mixing an organopolysiloxane having recurring units of the formula ##STR3## where R is selected from the group consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals having from 1 to 18 carbon atoms and n is a number of from 1.7 to 2.2, an organic peroxide vulcanizing agent and from 30 to 95 percent by weight of filler based on the weight of the composition, of which from about 30 to 100 percent by weight of the filler is silicon nitride particles and thereafter heating the resultant composition to a temperature sufficient to form an elastomer.
Claim 9
Dependent Claim
18 words
The method of claim 6, wherein the composition is heated to a temperature of at least 100° C.
Claim 10
Dependent Claim
12 words
The silicone elastomer prepared in accordance with the method of claim 6.
Claim 11
Dependent Claim
17 words
The elastomer of claim 6, wherein the organopolysiloxane is a copolymer of a dimethylsiloxane and a methylvinylsiloxane.
References Cited (Backward Citations)
US3070559A
Cited
US3499856A
Cited
US3499859A
Cited
US3642692A
Cited
US3836489A
Cited
US4024933A
Cited
US4123472A
Cited
JPS5571677A
Cited
US4419650A
Cited
US4292225A
Cited
JPS56161461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |