US5221339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-conductive silicone oil compound
Assignee: Shin-Etsu Chemical Co Ltd
•
Filing: 1990-02-06
•
Granted: 1993-06-22
•
Expires: 2010-02-06
Abstract
Abstract The silicone oil compound of the invention has a high thermal conductivity by virtue of compounding of a relatively large amount of a heat-conductivity improver such as zinc oxide, aluminum nitride and the like in a powdery form but still has an adequate and stable consistency suitable for application. This unique characteristic is obtained by the use of a specific silicone fluid as the base of the compound, which is a diorganopolysiloxane of which from 5 to 50% by moles of the silicon atoms at the molecular chain ends each have a hydroxy group bonded thereto.
Inventors
- 👤 Takayuki Takahashi
- 👤 Satoshi Kuwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:15
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/28; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C08K3/18; C08K3/20; C08K3/22; C08K3/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
A heat-conductive silicone oil compound which comprises, as a blend: (a) 100 parts by weight of an organopolysiloxane having a viscosity in the range from 10 to 100,000 centistokes at 25° C. and represented by the average unit formula R.sub.a SiO.sub.(4-a)/2, in which R is a group selected from the class consisting of unsubstituted or substituted monovalent hydrocarbon groups and hydroxy group bonded to the silicon atom at the molecular chain end and the subscript a is a positive number in the range from 1.95 to 2.20, from 5 to 50% by moles of the terminal silicon atoms at the molecular chain ends each having a hydroxy group bonded thereto; and (b) from 150 to 900 parts by weight of an inorganic material selected from the class consisting of zinc oxide, aluminum oxide, aluminum nitride and silicon nitride in a powdery form.
Claim 2
Dependent Claim
142 words
A heat-conductive silicone oil compound which comprises, as a blend: (a) 100 parts by weight of an organopolysiloxane having a viscosity in the range from 10 to 100,000 centistokes at 25° C. and represented by the average unit formula R.sub.a SiO.sub.(4-a)/2, in which R is a group selected from the class consisting of unsubstituted or substituted monovalent hydrocarbon groups and hydroxy group bonded to the silicon atom at the molecular chain end and the subscript a is a positive number in the range from 1.95 to 2.20, from 5 to 50% by moles of the terminal silicon atoms at the molecular chain ends each having a hydroxy group bonded thereto; and (b) from 150 to 900 parts by weight of an inorganic material selected from the class consisting of zinc oxide, aluminum oxide, aluminum nitride and silicon nitride in a powdery form.
Claim 3
Dependent Claim
31 words
The heat-conductive silicone oil compound as claimed in claim 1 wherein the organopolysiloxane as the component (a) has a viscosity in the range from 100 to 10,000 centistokes at 25° C.
Claim 4
Dependent Claim
34 words
The heat-conductive silicone oil compound as claimed in claim 1 wherein the inorganic material in a powdery form as the component (b) has a particle diameter in the range from 0.1 to 20 μm.
Claim 5
Dependent Claim
30 words
The heat-conductive silicone oil compound as claimed in claim 1 wherein the monovalent hydrocarbon group in the component (a) denoted by R is an alkyl group or a phenyl group.
Claim 6
Dependent Claim
91 words
The heat conductive silicone oil compound as claimed in claim 1 wherein said component (a) is obtained by reacting a mixture of a first organopolysiloxane in which each of the terminal silicone atoms has a hydroxy group bonded thereto, with a second organopolysiloxane terminated at each end of the molecular chain with a triorganosilyl group, said reaction being conducted in a closed vessel under rearrangement conditions to equilibrium in the presence of an alkali metal catalyst, followed by neutralization of said catalyst and stripping any volatile matters produced during said reaction.
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) | 1996-06-21 | 1996-12-21 | 1997-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-21 | 2000-12-21 | 2001-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-21 | 2004-12-21 | 2005-06-22 | $7700.00 | Window Closed / Lapsed |