Electroviscous fluid composition comprising a silicone oil, synthetic fluorinated oil and an addition polymer
US5391314A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1993 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Sep 3, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2020/01
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An electroviscous fluid composition comprising a dispersion medium of two nonmiscible components (A) and (B) as below, the volum ratio of (A)/(B) being in the ratio 99/1-1/99, and a dispersoid (C) as below; wherein the true specific gravity of the dispersoid (C) is greater than the specific gravity of said component (A) and less than the specific gravity of said component (B); PA0 Component (A): PA1 A silicone oil of general formula (I): EQU R.sub.a SiO.sub.(4-a)/2 (wherein R, which may be similar or dissimilar, are monovalent hydrocarbon groups with 1-18 carbon atoms and "a" lies in the range 1.8<a<3.0.) having a viscosity of 1-1,000 centistokes at 25.degree. C. and a specific gravity of 0.8-1.5, PA0 Component (B): PA1 A synthetic fluorinated oil having a viscosity of 1-1,000 centistokes at 25.degree. C. and a specific gravity greater than 1.4, PA0 Component (C): PA1 An addition polymer obtained by polymerizing a main component consisting of at least one type of monomer chosen from acrylic acid and its esters or metal salts, and methacrylic acid and its esters or metal salts; is disclosed. In this composition, there is far less sedimentation of dispersoid in comparison to conventi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.