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US4702855A
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Electroviscous fluids
Assignee: Bayer AG
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Filing: 1986-10-01
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Granted: 1987-10-27
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Expires: 2006-10-01
Abstract
Abstract Electroviscous fluids are disclosed which are composed of aluminum silicates particles in an electrically non-conductive liquid and a suitable dispersing agent. The atomic ratio of Al/Si on the surface of the aluminum silicate lies within the range of 0.15 to 0.80.
Inventors
- 👤 John Goossens
- 👤 Gunter Oppermann
- 👤 Wolfgang Grape
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:40
CPC Classifications
C; C10; C10M; C10M171/00; C10M169/00; C10M169/04; C10M169/044; C10M105/00; C10M107/00; C10M107/50; C10M125/00; C10M125/26; C10M155/00; C10M155/02; C10M171/001; C10M2201/00; C10M2201/087; C10M2201/10; C10M2201/102; C10M2201/105; C10M2203/00; C10M2203/003; C10M2203/02; C10M2203/022; C10M2203/024; C10M2203/04; C10M2207/00; C10M2207/28; C10M2207/287; C10M2207/289; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/26; C10M2215/30; 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; C10N2040/14; C10N2040/16; C10N2040/17; C10N2040/175; C10N2040/18; C10N2040/185
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
An electroviscous fluid comprising more than 25% by weight of an aluminum silicate with a water content of 1 to 25% by weight as a disperse phase and an electrically non-conductive hydrophobic liquid as a liquid phase and a dispersing agent, wherein the atomic ratio Al/Si on the surface of the aluminum silicate lies in the range of 0.15 to 0.80.
Claim 2
Dependent Claim
61 words
An electroviscous fluid comprising more than 25% by weight of an aluminum silicate with a water content of 1 to 25% by weight as a disperse phase and an electrically non-conductive hydrophobic liquid as a liquid phase and a dispersing agent, wherein the atomic ratio Al/Si on the surface of the aluminum silicate lies in the range of 0.15 to 0.80.
Claim 3
Dependent Claim
36 words
An electroviscous fluid according to claim 1, comprising a non-functional silicone oil as a liquid phase, wherein the dispersing agent consists of aminofunctional or hydroxyfunctional or acetoxyfunctional or alkoxyfunctional polysiloxanes having a molecular weight above 800.
Claim 4
Dependent Claim
28 words
An electroviscous fluid according to claim 2, wherein the functional polysiloxanes are added at a concentration of 1 to 30% by weight, based on the aluminum silicate particles.
Claim 5
Dependent Claim
45 words
An electroviscous fluid according to claim 2, wherein the aminofunctional polysiloxanes having the following structure: ##STR15## wherein 10<n<1000, m=0 to 5, R=H or alkyl with 1 to 8 atoms and X denotes a divalent hydrocarbon radical consisting of C, H and optionally O and/or N.
Claim 6
Dependent Claim
22 words
An electroviscous fluid according to claim 2, wherein the aminofunctional polysiloxanes have the following structure: ##STR16## wherein 10<n<1000 and m=0 to 3.
Claim 7
Dependent Claim
32 words
An electroviscious fluid according to claim 2, wherein the functional polysiloxanes have the following structure: ##STR17## wherein 10<n<1000 and y is a hydrolyzable group, more especially a hydroxy, alkoxy or carboxy group.
Claim 8
Dependent Claim
27 words
An electroviscous fluid according to claim 2, wherein the functional polysiloxanes are added at concentration of 5 to 20% by weight based on the aluminum silicate particles.
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) | 1990-10-26 | 1991-04-27 | 1991-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-26 | 1995-04-27 | 1995-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-26 | 1999-04-27 | 1999-10-27 | $7700.00 | Window Closed / Lapsed |