Epoxy group-containing silicone resin and compositions based thereon

An epoxy group-containing silicone resin prepared by

• (A) reacting, in the presence of water and a basic catalyst,
• (I) at least one organopolysiloxane selected from the group consisting of
• (i) an organopolysiloxane consisting essentially of siloxane units with the general formula
• R.sup.4 SiO.sub.3/2,
• (ii) an organopolysiloxane consisting essentially of siloxane units with the general formula
• R.sup.5 R.sup.6 SiO.sub.2/2,
• (iii) an organopolysiloxane consisting essentially of siloxane units with the general formulas
• R.sup.4 SiO.sub.3/2 and R.sup.5 R.sup.6 SiO.sub.2/2
• and
• (iv) organopolysiloxane consisting essentially of siloxane units with the general formulas
• R.sup.4 SiO.sub.3/2, R.sup.5 R.sup.6 SiO.sub.2/2 and SiO.sub.4/2
• wherein R.sup.4, R.sup.5 and R.sup.6 are independently selected from monovalent hydrocarbon groups, with the proviso that said component (ii) is not used by itself as said organopolysiloxane (I) and (II) an epoxy-containing alkoxysilane with the general formula
• R.sup.7 R.sup.8.sub.d Si(OR.sup.9).sub.(3-d)
• or partial hydrolyzate thereof, wherein R.sup.7 and R.sup.8 is each selected from the group consisting of epoxy-containing organic groups and monovalent hydrocarbon groups, R.sup.9 represents an alkyl group and d is zero or 1 and said component (II) is added in a quantity such that the epoxy-containing organic groups in component (II) comprise 0.1 to 40 mole percent of the total silicon-bonded organic groups in components (I) and (II);
• and (B) subjecting the reaction product of step (A) to an equilibration reaction.