PURPOSE: To obtain an electroviscous fluid by using, as the main component, a liq. crystalline compd. having at least two liq. crystalline groups each bonded to the main molecular chain through a spacer contg. an oxyalkylene unit.

CONSTITUTION: A liq. crystalline compd. E contg. oxyalkylene units (e.g. a compd. of formula I) is obtd. by reacting the reactional product of ethylene glycol monoallyl ether with p-toluenesulfonyl chloride with p-hydroxybenzoic acid. Compd. E is subjected to the addition reaction with a dimethylsiloxane- monomethylhydrogensiloxane copolymer to give a branched liq. crystalline compd. A of formula II which has at least two liq. crystalline groups each bonded to the main molecular chain through a spacer contg. an oxyalkylene unit. An electroviscous fluid mainly comprising compd. A has a low base viscosity and can be operated at a relatively low temp.