US3885984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methyl alkyl silicone thermoconducting compositions
Assignee: General Electric Co
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Filing: 1973-12-18
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Granted: 1975-05-27
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Expires: 1993-12-18
Abstract
Abstract High performance heat transfer compositions comprising (i) a methyl alkyl polysiloxane and (ii) a thickener selected from oxides of beryllium, aluminum, silicon and zinc. The alkyl group carbon content ranges from C4 to C16 and the thermoconductance values are substantially higher than those obtained with prior art silicone compositions. The thermoconductors are also unique in that they do not resist painting and soldering.
Inventors
- 👤 John H Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:02
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/08; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/34; C08K3/36
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
14 words
A COMPOSITION HAVING HIGH THERMOCONDUCTANCE CONPRISING: I. A METHYL ALKYL POLYSILOXANE HAVING THE FORMULA
Claim 2
Dependent Claim
14 words
A COMPOSITION HAVING HIGH THERMOCONDUCTANCE CONPRISING: I. A METHYL ALKYL POLYSILOXANE HAVING THE FORMULA
Claim 3
Dependent Claim
18 words
A composition as defined in claim 1, further characterized by having a thermoconductivity of at least 0.400 BTU/hr./ft.2/*F./ft.
Claim 4
Dependent Claim
21 words
A composition as defined in claim 1 wherein, in component (i), R1 is alkyl of from six to 12 carbon atoms.
Claim 5
Dependent Claim
20 words
A composition as defined in claim 3 wherein, in component (i), R1 is alkyl from eight to 10 carbon atoms.
Claim 6
Dependent Claim
13 words
A composition as defined in claim 1 wherein component (ii) is zinc oxide.
Claim 7
Dependent Claim
92 words
A composition having high thermoconductance comprising: i. a trimethylsilyloxy chain-stopped methyl alkyl polysiloxane fluid wherein said alkyl groups have an average chain length of from eight to 10 carbon atoms, said fluid having a viscosity in the range of 25 to 1,500 centistokes at about 25* C.; and ii. a thickener comprising zinc oxide, the zinc oxide being present in an amount of from about 65 to about 95% by weight of (i) and (ii), the composition having a penetration of at least 350 when measured according to ASTM Test Method 217D.
Claim 8
Dependent Claim
92 words
A composition having high thermoconductance comprising: i. a trimethylsilyloxy chain-stopped methyl alkyl polysiloxane fluid wherein said alkyl groups have an average chain length of from eight to 10 carbon atoms, said fluid having a viscosity in the range of 25 to 1,500 centistokes at about 25* C.; and ii. a thickener comprising zinc oxide, the zinc oxide being present in an amount of from about 65 to about 95% by weight of (i) and (ii), the composition having a penetration of at least 350 when measured according to ASTM Test Method 217D.
Claim 9
Dependent Claim
19 words
A composition as defined in claim 6, further characterized in having a thermoconductivity of greater than about 0.400 BTU/hr./ft.2/*F./ft.
Claim 10
Dependent Claim
76 words
A composition as defined in claim 6 wherein component (1) is a trimethylsilyloxy chain-stopped methyl octyl polysiloxane fluid having an average of about 24 repeating units, the zinc oxide is present in an amount corresponding to 80 to 85% the weight of (i) and (ii), the composition has a penetration of from about 240 to about 280 when measured according to ASTM Test Method 217D and the thermoconductivity is from about 0.500 to about 0.600 BTU/hr./ft.2/*F./ft.
Claim 11
Dependent Claim
14 words
A composition having high thermoconductance comprising: i. a methyl alkyl polysiloxane having the formula
Claim 12
Dependent Claim
14 words
A composition having high thermoconductance comprising: i. a methyl alkyl polysiloxane having the formula
Claim 13
Dependent Claim
18 words
A composition as defined in claim 9, further characterized by having a thermoconductivity of at least 0.400 BTU/hr./ft.2/*F./ft.
Claim 14
Dependent Claim
21 words
A composition as defined in claim 9 wherein, in component (i), R1 is alkyl of from six to 12 carbon atoms.
Claim 15
Dependent Claim
20 words
A composition as defined in claim 11 wherein, in component (i), R1 is alkyl from eight to 10 carbon atoms.
Claim 16
Dependent Claim
13 words
A composition as defined in claim 9 wherein component (ii) is zinc oxide.
References Cited (Backward Citations)
US2900338A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |