Patent ID: 6025456
Filing Date: 2000-02-15
Classification: C08G,C08L,G11B

Abstract:
A binder system curable by crosslinking and comprising:a hydroxyl-containing polyurethane I consisting essentially of:a) a dilsocyanate of 6 to 30 carbon atoms (component II) and selected from the group consisting of hexamethylene 1,5-diisocyanate, hexamethylene 1,6-diisocyanate, cyclohexylene 1,4-diisocyanate, dicyclohexylmethane diisocyanate, isophorone diisocyanate, toluylene 2,4-diisocyanate, toluylene 2,6-diisocyanate, m-tetramethylxylene diisocyanate, p-tetramethylxylene diisocyanate, tetrahydronaphthylene 1,5-diisocyanate and diphenylenemethane 4,4'-diisocyanate;b) a component III consisting essentially of.alpha.) an aliphatic diol of 2 to 20 carbon atoms or.beta.) an aromatic-aliphatic or aromatic-cycloaliphatic diol of 8 to 30 carbon atoms having nonphenolic hydroxyl groups as hydroxyl groups of the diol; andc) a polyhydric alcohol having at least 3 hydroxyl groups, 3 to 18 carbon atoms and nonphenolic hydroxyl groups as hydroxyl groups of the alcohol (component IV); the amounts of components II to IV being such that the total number of nonphenolic hydroxyl groups is from 1.1 to 5.0 per isocyanate group of II and containing magnetic pigments.