Patent ID: 6030544
Filing Date: 2000-02-29
Classification: C10M,F03G,F15B,H02N

Abstract:
An electro-sensitive movable fluid composition comprising a hydrocarbon compound having 5 to 10 carbon atoms, and at least one compound having a conductivity .sigma. and a viscosity .eta. located inside a triangle in a graph showing a relation between a conductivity .sigma., plotted as abscissa, and a viscosity .eta., plotted as ordinate, of the fluid at the working temperature, said triangle having, as vertexes, a point P indicated by the conductivity .sigma.=4.times.10.sup.-10 S/m and the viscosity .sigma.=1.times.10.sup.0 Pa.S, a point Q indicated by the conductivity .sigma.=4.times.10.sup.-10 S/m and the viscosity .eta.=1.times.0.sup.-4 Pa.s, and a point R indicated by the conductivity .sigma.=5.times.10.sup.-6 S/m and the viscosity .eta.=1.times.10.sup.-4 Pa.S, said composition being adjusted to have a conductivity .sigma. and a viscosity .eta. located inside said triangle, wherein said compound is selected from the group consisting of compounds having the general formula: ##STR67## where X.sup.3 is a monovalent group having 1-25 carbon atoms, 0-3 oxygen atoms of an epoxy group and (2a+1-2b) hydrogen atoms where (a) is an integer of 1 to 25, b is 0 to 3, such that 2a+1>2b; andwhere Y.sup.3 is a linear hydrocarbon group of 1 to 14 carbon atoms or a hydrocarbon group of 1 to 14 carbon atoms having a branched chain and a carbon-to-carbon double bond,provided that when X.sup.3 contains oxygen atoms, Y.sup.3 is a linear hydrocarbon group, and when X.sup.3 contains no oxygen atoms, Y.sup.3 has a branched chain and carbon-to-carbon double bond.