Global Patent Index - EP 0395359 A1

EP 0395359 A1 19901031 - Electroviscous electrically insulating fluids.

Title (en)

Electroviscous electrically insulating fluids.

Title (de)

Elektroisolierende elektroviskose Flüssigkeiten.

Title (fr)

Fluides électrovisqueux électriquement isolants.

Publication

EP 0395359 A1 19901031 (EN)

Application

EP 90304402 A 19900424

Priority

JP 10699789 A 19890426

Abstract (en)

In an electrically insulating liquid medium there are mixed (a) 0.1 - 50 wt% of dispersed solid particles of size 10 nm - 200 mu m (e.g. silica gel), (b) 0.1 - 5 wt% of an acid, base or salt, (c) a polyhydric alcohol (e.g. ethylene glycol) and (d) an antioxidant (e.g. 0.01 - 10 wt% of a phenol or amine) which prevents oxidation of the liquid and the alcohol and/or a corrosion inhibitor (e.g. 0.001 - 10 wt% of a benzotriazole derivative or imidazole) which prevents corrosion of the electrode and generation of metallic ions. Optionally an agent to assist dispersing of the solid particles is included (e.g. a sulphonate or phosphonate). The resultant electroviscous fluid can have good effects, including responsiveness and reproducibility and durability when used at temperatures up to 100 DEG C and can be used in electrical control of mechanical devices by utilizing its viscosity change.

IPC 1-7

C10M 171/00

IPC 8 full level

C10M 129/10 (2006.01); C10M 129/14 (2006.01); C10M 133/12 (2006.01); C10M 133/34 (2006.01); C10M 133/38 (2006.01); C10M 133/40 (2006.01); C10M 133/44 (2006.01); C10M 133/46 (2006.01); C10M 135/20 (2006.01); C10M 135/26 (2006.01); C10M 135/28 (2006.01); C10M 135/36 (2006.01); C10M 171/00 (2006.01); C10N 30/10 (2006.01); C10N 30/12 (2006.01); C10N 40/14 (2006.01)

CPC (source: EP)

C10M 171/001 (2013.01)

Citation (search report)

  • US 3047507 A 19620731 - WINSLOW WILLIS M
  • US 3367872 A 19680206 - MARTINEK THOMAS W, et al
  • US 2751351 A 19560619 - YOUNG DAVID W, et al
  • [A] CHEMICAL ABSTRACTS, vol. 92, no. 2, 19th May 1980, page 127, abstract no. 166046u, Columbus, Ohio, US; S.D. LIKHTEROV et al.: "Electroviscous effect in oils containing additives", & KHIM. TEKHNOL. TOPL. MASEL 1980, (1), 43-5

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 0395359 A1 19901031; EP 0395359 B1 19930922; DE 69003434 D1 19931028; DE 69003434 T2 19940120; JP H02284992 A 19901122

DOCDB simple family (application)

EP 90304402 A 19900424; DE 69003434 T 19900424; JP 10699789 A 19890426