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US4056546A
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Hydrocarbonoxy-containing silicone fluids useful as hydraulic fluids
Assignee: General Electric Co
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Filing: 1976-07-30
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Granted: 1977-11-01
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Expires: 1996-07-30
Abstract
Abstract A silicone polymer fluid useful as a brake fluid comprising a polymer or monomer having 0 to 100 mole percent of polymeric or monomeric units selected from R 2 Si(OM) 2 units, ##STR1## AND R 2 SiO units, 0 to 100 mole percent of polymeric and monomeric units selected from RSi(OM) 3 units, ##STR2## AND RSiO 3/2 units, 0 to 10 mole percent of units selected from the class consisting of (MO) 3 SiO 1/2 units, (MO) 2 SiO units, (MO)SiO 3/2 units and SiO 2 units and 0 to 5 mole percent of units selected from R 3 SiO 1/2 units wherein the viscosity of the polymer may vary from 2 to 400 centistokes at 25° R is a monovalent hydrocarbon radical, M is selected from alkyl, alkoxy, alkylene, alkoxyalkyleneoxyalkylene and alkyl polyether substituent radicals, wherein the preferred substituent for M is 2-methoxy-2-ethoxy-ethylene or higher and R is preferably methyl.
Inventors
- 👤 Edgar D. Brown, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:02
CPC Classifications
C; C10; C10M; C10M3/00; C08; C08G; C08G77/00; C08G77/04; C10M2201/00; C10M2201/02; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/06; C10M2215/062; C10M2215/066; C10M2215/16; C10M2229/00; C10M2229/04; C10M2229/045; C10M2229/046; C10M2229/047; C10M2229/048; C10M2229/05; C10M2229/051; C10M2229/052; C10N; C10N2020/00; C10N2020/01; C10N2040/00; C10N2040/06; C10N2040/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
205 words
A silicone fluid useful as a hydraulic fluid consisting essentially of a polymer having 75 to 95 mole percent by weight of polymeric units selected from the class consisting of from ##STR22## and R 2 SiO units and mixtures thereof, 5 to 25 mole percent of polymeric units selected from the class consisting of ##STR23## and RSiO 3/2 units and mixtures thereof with trace amounts of other units selected from the class consisting of (MO) 3 SiO 1/2 units, (MO) 2 SiO units, MOSiO 3/2 units, SiO 2 units and R 3 SiO 3/2 units and substantially free of disiloxanes, wherein the molar amount of MO groups present based on the total moles of R and MO groups present may vary from 5 to 95 mole percent, wherein the viscosity of the polymer may vary from 2 to 400 centistokes at 25° C, R is a lower alkyl radical, M is selected from the class consisting of ROR'--, ROR'OR'--, and R(OC x H 2x ) n -- such that R is as previously defined, R' is selected from the class consisting of alkylene and arylene radicals of 1 to 10 carbon atoms, x varies from 2 to 4 and n varies from 4 to 100.
Claim 2
Dependent Claim
205 words
A silicone fluid useful as a hydraulic fluid consisting essentially of a polymer having 75 to 95 mole percent by weight of polymeric units selected from the class consisting of from ##STR22## and R 2 SiO units and mixtures thereof, 5 to 25 mole percent of polymeric units selected from the class consisting of ##STR23## and RSiO 3/2 units and mixtures thereof with trace amounts of other units selected from the class consisting of (MO) 3 SiO 1/2 units, (MO) 2 SiO units, MOSiO 3/2 units, SiO 2 units and R 3 SiO 3/2 units and substantially free of disiloxanes, wherein the molar amount of MO groups present based on the total moles of R and MO groups present may vary from 5 to 95 mole percent, wherein the viscosity of the polymer may vary from 2 to 400 centistokes at 25° C, R is a lower alkyl radical, M is selected from the class consisting of ROR'--, ROR'OR'--, and R(OC x H 2x ) n -- such that R is as previously defined, R' is selected from the class consisting of alkylene and arylene radicals of 1 to 10 carbon atoms, x varies from 2 to 4 and n varies from 4 to 100.
Claim 3
Dependent Claim
12 words
The silicone fluid of claim 1 wherein R is selected from methyl.
Claim 4
Dependent Claim
32 words
The silicone fluid of claim 1 wherein there is present in said fluid polymer 20% by weight to 48% by weight of MO groups based on the total weight of the fluid.
Claim 5
Dependent Claim
18 words
The silicone fluid of claim 1 wherein R is lower alkyl having from 1 to 8 carbon atoms.
Claim 6
Dependent Claim
15 words
The silicone fluid of claim 1 wherein M is 2-methoxy-2-ethoxy ethylene and R is methyl.
References Cited (Backward Citations)
US3821114A
Cited
US3984449A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |