Siloxane mixtures containing epoxide resins and method for the preparation thereof and use thereof

A composition comprising (A) 50-99.5% by weight based on the total weight of A, B and C of a reactive resin or reactive resin mixture which can be processed to give thermosets, and which is liquid at temperatures in the range from 15 to 100° C. and has an average molecular weight of from 200 to 500,000, and has a sufficient number of suitable reactive groups for the curing process, and

• (B) 0.5-50% by weight based on the total weight of A, B and C of one or more dispersed polyorganosiloxanes, which are present homogeneously in finely dispersed form as polyorganosiloxane droplets having a diameter of from 0.001 to 4 μm in the reactive resin or reactive resin mixture, wherein the polyorganosiloxane droplets are a polymer of the general formula (R3SiO1/2)w(R2SiO2/2)x.(RSiO3/2)y.(SiO4/2)z wherein w=0 to 20 mol %, x=80 to 99.9 mol %, y=0.5 to 10 mol %, z=0 to 10 mol %, or a polymer of the general formula (R3SiO1/2)w(R2SiO2/2)x wherein w=0.1 to 20 mol % and x=80 to 99.9 mol %;
• wherein R is selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, alkoxy, alkenyl, substituted or unsubstituted aryl, mercaptoalkyl, cyanoalkyl, aminoalkyl, (meth)acryloyloxyalkyl, hydroxyalkyl and epoxy, and
• (C) 0.1-50% by weight based on the total weight of A, B and C of one or more siloxane-containing block copolymers as dispersants, which form a homogeneous solution or emulsion in the reactive resin or reactive resin mixture.