AMINO-FUNCTIONAL POLYSILOXANES AND THEIR USE IN COATINGS

摘要

The present invention relates to an amino-functional polysiloxane of formula (1) R2-0-[-SiR1(0R3NHR5)0-]-?n#191R2 (1)wherein each R1 is independently selected from the group comprising alkyl and aryl radicals, each R2 is independently selected from the group comprising hydrogen, alkyl and aryl radicals, n is selected so that the molecular weight for the functional polysiloxane is in the range of from 400 to 10,000 and R3 is a bivalent radical or -O-R3-NH-R5 is hydroxy or alkoxy, and R5 is selected from the group comprising hydrogen, aminoalkyl, aminoalkenyl, aminoaryl, aminocycloalkyl radical, optionally substituted by alkyl, aryl, cycloalkyl, halogen, hydroxy, alkoxy, thioalkyl, amino, amino derivatives, amido, amidoxy, nitro, cyano, keto, acyl derivatives, acyloxy derivatives, carboxy, ester, ether, esteroxy, heterocycle, alkenyl or alkynyl and wherein 0 to 90 % of -O-R3-NH-R5 is hydroxy or alkoxy. The present invention further relates to an epoxy-polysiloxane composition obtainable by combining the following ingredients: (a) a polysiloxane of formula (4), wherein each R1' is independently selected from the group comprising hydroxy, alkyl, aryl and alkoxy radicals having up to six carbon atoms, each R2 is independently selected from the group comprising 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, withR2-0-[-Si(R1')?2#1910-]-?n#191R2 (4) (b) 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 (c) an aminopolysiloxane hardener component or an amino-functional polysiloxane hardener component of formula (1), having active hydrogens able to react with the epoxy groups in the epoxy resin to form epoxy polymers, and able to react with the polysiloxane to form polysiloxane polymers, wherein the epoxy chain polymers and polysiloxane polymers polymerize to form a cured epoxy-polysiloxane polymer composition.