potassium hydroxide or a lewis acid furthermore the reaction of equation 2 may proceed without a catalyst the viscosity of the hydrolyzed prepolymer v can be 500 u02dc 4000 cps preferrably 700 u02dc 3500 cps equation 3 of fig3 illustrates the preparation of polysiloxane with tertiary amine groups the hydrolyzed prepolymer v and the cyclic siloxane vi react to form polysiloxane with tertiary amine groups vii by ring opening polymerization the functional group r of cyclic siloxane vi can be either an alkyl group or a phenyl group with a carbon number of 1 u02dc 4 t is an integer between 3 u02dc 7 x of the polysiloxane with tertiary amine group vii is an integer between 100 u02dc 400 the weight ratio of prepolymer v to cyclic siloxane vi ranges from 1 95 to 1 75 the reaction temperature can be at 50 u02dc 180 u00b0 c preferrably at 100 u02dc 150 u00b0 c the reaction time can be 2 u02dc 8 hours the catalyst used in this reaction can be a basic catalyst such as potassium hydroxide or sodium hydroxide the amine content of the polysiloxane with tertiary amine groups according to the invention can be 2 u02dc 15 preferrably 8 u02dc 10 the viscosity of the polysiloxane with tertiary amine groups is 500 u02dc 7000 cps preferrably 4000 u02dc 5000 cps one characteristic of the invention is that the amine groups.