Patent ID: 7026424

Claim:
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 (HO)(R 2 SiO) n-1 [H] to give aminoalkylpolydiorganosiloxane(s) of the formula H 2 N—X—[SiR 2 O] n SiR 2 —X—NH 2 and in the second step, polymerizing the aminoalkylpolydiorganosiloxane(s) of the formula (4) with at least one diisocyanate of the formula OCN—Y—NCO 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 1 –C 6 -alkyl or C 1 –C 6 -alkyl ester and having 1 to 700 carbon atoms, in which nonadjacent methylene units are optionally replaced by —O—, —COO—, —OCO—, or —OCOO— groups, 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.