Epoxy modified organopolysiloxane resin based compositions useful for protective coatings

An epoxy modified polysiloxane composition obtainable by combining the following ingredients:

• a polysiloxane of formula (1), wherein each R1 is independently selected from the group consisting of hydroxy, alkyl, aryl and alkoxy radicals having up to six carbon atoms, each R2 is independently selected from the group consisting of hydrogen, alkyl and aryl radicals having up to six carbon atoms and, wherein n is selected so that the molecular weight for the polysiloxane is in the range of from about 400 to 10,000;
• with
• an epoxy resin having more than one 1,2-epoxy groups per molecule with an epoxy equivalent weight in the range of from 100 to about 5,000;
• and
• a polyoxyalkylenepolyamine hardener of formula (2)
• [H2N—(R5CHCH2O)xyQ (2)
• wherein Q is the residue of an active hydrogen-containing polyvalent compound;
• each R5 is independently hydrogen or alkyl;
• x is at least 1;
• and y is at least 2, provided that the average value for x is less than 10 for the low molecular weight polyoxyalkylene polyamine, said hardener having active hydrogens able to react with epoxy groups in the epoxy resin to form polymers containing hydroxyl groups, which are able to react with the silanol groups of hydrolyzed polysiloxane to form a polymer network, wherein the epoxy chain polymers and polysiloxane polymers polymerize to form a cured epoxy modified polysiloxane polymer composition.