US4828739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating composition and hydraulic fluid
Assignee: Momentive Performance Materials Japan LLC
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Filing: 1988-04-13
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Granted: 1989-05-09
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Expires: 2008-04-13
Abstract
Abstract The present invention concerns a lubricating composition which comprises: (A) 100 parts by weight of polyorganosiloxane having a viscosity of 50 cSt or more at 25° C., wherein an organic group bonded to a silicon atom being a monovalent hydrocarbon group containing no aliphatic unsaturated bonding and (B) 0.01 to 7 parts by weight of polymethylsilsesquioxane powder having an average particle size of 0.05 to 50 μm. Also, the present invention concerns a hydraulic fluid which comprises: (C) 100 parts by weight of polyorganosiloxane having a viscosity of 500 cSt or more at 25° C., wherein an organic group bonded to a silicon atom being a methyl group or a phenyl group, and 0.01 to 7 parts by weight of Component (B) as mentioned above.
Inventors
- 👤 Yoshiyuki Satoh
- 👤 Shinji Kida
- 👤 Hiroshi Kimura
- 👤 Masaaki Otsuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:13
CPC Classifications
C; C10; C10M; C10M107/00; C10M107/20; C10M107/22; C10M169/00; C10M169/04; C10M169/041; C10M107/50; C10M155/00; C10M155/02; C10M2229/00; C10M2229/02; C10M2229/025; C10M2229/04; C10M2229/0405; C10M2229/041; C10M2229/0415; C10M2229/042; C10M2229/0425; C10M2229/043; C10M2229/0435; C10M2229/044; C10M2229/0445; C10M2229/045; C10M2229/0455; C10M2229/046; C10M2229/0465; C10M2229/047; C10M2229/0475; C10M2229/048; C10M2229/0485; C10M2229/05; C10M2229/0505; C10M2229/051; C10M2229/0515; C10M2229/052; C10M2229/0525; C10M2229/053; C10M2229/0535; C10M2229/054; C10M2229/0545; C10N; C10N2020/00; C10N2020/01; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
63 words
A lubricating composition which comprises: (A) 100 parts by weight of polyorganosiloxane having a viscosity of 50 cSt or more at 25° C., wherein an organic group bonded to a silicon atom being a monovalent hydrocarbon group containing no aliphatic unsaturated bonding, and (B) 0.01 to 7 parts by weight of polymethylsilsesquioxane powder having an average particle size of 0.05 to 50 μm.
Claim 2
Dependent Claim
63 words
A lubricating composition which comprises: (A) 100 parts by weight of polyorganosiloxane having a viscosity of 50 cSt or more at 25° C., wherein an organic group bonded to a silicon atom being a monovalent hydrocarbon group containing no aliphatic unsaturated bonding, and (B) 0.01 to 7 parts by weight of polymethylsilsesquioxane powder having an average particle size of 0.05 to 50 μm.
Claim 3
Dependent Claim
18 words
A lubricating composition according to claim 1, wherein said polyorganosiloxane oil of Component (A) is a linear polydiorganosiloxane.
Claim 4
Dependent Claim
17 words
A lubricating composition according to claim 2, wherein said polyorganosiloxane oil of Component (A) is a polymethylphenylsiloxane.
Claim 5
Dependent Claim
17 words
A lubricating composition according to claim 2, wherein said polyorganosiloxane oil of Component (A) is a polydimethylsiloxane.
Claim 6
Dependent Claim
25 words
A lubricating composition according to claim 1, wherein a viscosity of said polyorganosiloxane oil of Component (A) at 25° C. is 1,000 to 500,000 cSt.
Claim 7
Dependent Claim
20 words
A lubricating composition according to claim 1, wherein an average particle size of Component (B) is 0.01 to 20 μm.
Claim 8
Dependent Claim
30 words
A lubricating composition according to claim 1, wherein a formulating amount of Component (B) is from 0.1 parts by weight or more to not more than 5 parts by weight.
Claim 9
Dependent Claim
61 words
A hydraulic fluid which comprises: (C) 100 parts by weight of polyorganosiloxane having a viscosity of 500 cSt or more at 25° C., wherein an organic group bonded to a silicon atom being a methyl group or a phenyl group, and (B) 0.01 to 7 parts by weight of polymethylsilsesquioxane powder having an average particle size of 0.05 to 50 μm.
Claim 10
Dependent Claim
61 words
A hydraulic fluid which comprises: (C) 100 parts by weight of polyorganosiloxane having a viscosity of 500 cSt or more at 25° C., wherein an organic group bonded to a silicon atom being a methyl group or a phenyl group, and (B) 0.01 to 7 parts by weight of polymethylsilsesquioxane powder having an average particle size of 0.05 to 50 μm.
Claim 11
Dependent Claim
18 words
A hydraulic fluid according to claim 8, wherein said polyorganosiloxane oil of Component (C) is a linear polydiorganosiloxane.
Claim 12
Dependent Claim
25 words
A hydraulic fluid according to claim 8, wherein a viscosity of said polyorganosiloxane oil of Component (C) at 25° C. is 1,000 to 500,000 cSt.
Claim 13
Dependent Claim
26 words
A hydraulic fluid according to claim 8, wherein 3 to 40% of organic groups bonded to silicon atoms in Component (C) polyorganosiloxane oil are phenyl groups.
Claim 14
Dependent Claim
19 words
A hydraulic fluid according to claim 8, wherein molecule of Component (C) polyorganosiloxane oil is endblocked with triorganosiloxy groups.
Claim 15
Dependent Claim
20 words
A hydraulic fluid according to claim 8, wherein an average particle size of Component (B) is 0.1 to 20 μm.
Claim 16
Dependent Claim
30 words
A hydraulic fluid according to claim 8, wherein a formulating amount of Component (B) is from 0.1 parts by weight or more to not more than 5 parts by weight.
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) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |