Patent ID: 7026424
Filing Date: 2006-04-11
Classification: C08G

Abstract:
1. A colorless organopolysiloxane/polyurea/polyurethane block copolymer (A) of the formula which is prepared by a process comprising in a first step, reacting a cyclic silazane of the formula  with at least one organosilicon compound of the formula  to give aminoalkylpolydiorganosiloxane(s) of the formula and in the second step, polymerizing the aminoalkylpolydiorganosiloxane(s) of the formula (4) with at least one diisocyanate of the formula  optionally with one or more diamine chain extenders; and with at least one of isocyanate blocked dihydroxy chain extenders, dihydroxy chain extenders, bis(hydroxyalkyl)organopolysiloxanes, or water, where R is a monovalent hydrocarbon radical optionally substituted by fluorine or chlorine and having 1 to 20 carbon atoms, X is an alkylene radical having 1 to 20 carbon atoms, in which nonadjacent methylene units are optionally replaced by —O— groups, A is an oxygen atom or an amino group —NR′—, Z is an oxygen atom or an amino group —NR′—, R′ is hydrogen or an alkyl radical having 1 to 10 carbon atoms, Y is a divalent hydrocarbon radical optionally substituted by fluorine or chlorine and having 1 to 20 carbon atoms, D is an alkylene radical optionally substituted by fluorine, chlorine, C n is from 1 to 4000, a is is at least 1, b is from 0 to 40, c is from 0 to 30, and d is greater than 0.