Magnetorheological formulation

US8486292B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Christoffer Kieburg · Ludwigshafen, DE
• Jürgen Pfister · Speyer, DE
• Claus Gabriel · Ludwigshafen am Rhein, DE
• Günter Oetter · Bischofswerda, DE
• Martin Laun · Mannheim, DE
• Rene Lochtman · Mannheim, DE

Key dates

• Filing date: Sep 18, 2007
• Grant date: Jul 16, 2013
• Expiry date: Nov 27, 2028

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F1/447
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

Magnetorheological formulations, processes for preparing the same and uses therefor, the formulations comprising: (a) an ionic liquid comprising anions and cations, and (b) dispersed magnetizable particles having a mean diameter of 0.1 to 500 μm; wherein the ionic liquid comprises one or more salts selected from the group consisting of 1-butyl-3-methyl-imidazolium methylsulfate, 1-ethyl-3-methylimidazolium ethylsulfate, 1-ethyl-3-methyl-imidazolium thiocyanate, 1-butyl-3-methylimidazolium thiocyanate, 1-ethyl-3-methyl-imidazolium acetate, 1-butyl-3-methylimidazolium acetate, 1-ethyl-3-methylpyridinium ethylsulfate, 1-ethyl-3-methylimidazolium dicyanamide, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-hexyl-3-methylimidazolium tetrafluoroborate, 1-methyl-3-octylimidazolium tetrafluoroborate, 1-methyl-3-octylimidazolium hexafluorophosphate, 1-ethyl-3-methylimidazolium hexafluorophosphate, 1-hexyl-3-methylimidazolium hexafluorophosphate, methyltrioctylammonium bis(trifluoromethylsulfonyl)imide, 1-ethyl-3-methylimidazolium 2-(2-methoxyethoxy)ethylsulfate and mixtures thereof.