Patent ID: 6433124
Filing Date: 2002-08-13
Classification: C08G

Abstract:
A process for doubling the number of groups which are reactive toward isocyanates in polymers which are free of urethane groups, which comprises reacting a polymer which is free of urethane groups and has the formula X:L(Z1H)mâ€ƒâ€ƒ(X), with a compound of the formula XI: where L is a polymer which is free of urethane groups and has a molecular weight Mn of at least 300, or any linear or branched sequence of two or more such polymers, A is a substituted or unsubstituted, linear or branched, saturated or unsaturated alkylene group having from 2 to 12 carbon atoms or a substituted or unsubstituted, saturated or unsaturated cycloalkylene group or a substituted or unsubstituted arylene group having from 3 to 18 carbon atoms or an arylene-alkylene group having from 7 to 18 carbon atoms or a heterocyclic group or any linear or branched sequence of two or more of the groups mentioned, Z1 and Z2 are each, independently of one another, NR, S or O, R is H, CH3 or a substituted or unsubstituted, linear or branched, saturated or unsaturated alkyl group having from 2 to 12 carbon atoms or a substituted or unsubstituted, saturated or unsaturated cycloalkyl group or a substituted or unsubstituted aryl group having from 3 to 18 carbon atoms, or any linear or branched sequence of two or more of the groups mentioned, B is a covalent bond, CH2 or a substituted or unsubstituted, linear or branched, saturated or unsaturated alkylene group having from 2 to 12 carbon atoms or a substituted or unsubstituted, saturated or unsaturated cycloalkylene group or a substituted or unsubstituted arylene group having from 3 to 18 carbon atoms, or any linear or branched sequence of two or more of the groups mentioned, n is from 1 to 20, m is from 1 to 50 and XY is a reactive radical which is inert toward NCO groups, where the reactive radical splits off one or more protective groups Y under acidic, neutral or basic conditions and the radical X bears, after Y has been split off, at least two groups which are reactive toward isocyanate and XY is a dioxane, dioxolane or oxazolidine group.