Patent ID: 6861493

Claim:
A branched polyurethane obtainable by reacting A) one or more aliphatic and/or aromatic isocyanates having a functionality of at least three with B) from about 90.0 to about 99.8 eq. % of one or more polyethers of structure RO(SO)w(BO)x(PO)y(EO)zH and C) from about 0.2 to about 10.0 eq. % of at least one of the compounds from the following group: a. polyethers of structure HO(SO)w′(BO)x′(PO)y′(EO)z′H b. polyether polydimethylsiloxane diols of structure HO(SO)w′(BO)x′(PO)y′(EO)z′Z-PDMS-Z(EO)z′(PO)y′(BO)x′(SO)w′OH c. polyester polydimethylsiloxane diols of structure H—(OC 5 H 10 CO-)y′-Z-PDMS-Z-(CO—C 5 H 10 O-)y′-H d. polydimethylsiloxane diols of structure HO—Y-PDMS-Y—OH e. polydimethylsiloxane diamines of structure R′NH—Y-PDMS-Y—HNR′ f. polyether diamines of structure R′HN—(PO)y′(EO)z′-X-(EO)z′(PO)y′-NHR′ in which R is hydrogen or a hydrocarbon radical which is optionally substituted or functionalized, R′ is hydrogen or a hydrocarbon radical which is optionally substituted or functionalized, SO=styrene oxide, BO=butylene oxide, PO=propylene oxide, EO=ethylene oxide, PDMS=polydimethylsiloxane w=0 to 5, x=0 to 5, y=0 to 20, z=50 to 200, w′=0 to 5, x′=0 to 5, y′=0 to 10, z′=1 to 49, Z=—C n H 2n O— or —CH 2 —CH 2 O—C n H 2n O—, where n=2to 12; X=—C n H 2n — or —C 6 H 4 —, where n=2 to 12; Y=—C m H 2m , in which m=1 to 8.