BRANCHED POLYURETHANES, FORMULATIONS COMPRISING THEM, AND THEIR USE FOR THICKENING AQUEOUS SYSTEMS

A) one or more aliphatic and/or aromatic isocyanates having a functionality of at least three with B) from 90.0 to 99.8 eq.% of one or more polyethers of structure RO(SO)w(BO)x(PO)y(EO)zH and C) from 0.2 to 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-(OC5H10CO-)y'-Z-PDMS-Z-(CO-C5H10O-)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 a hydrocarbon radical of 1 to 50 carbon atoms which if desired is also substituted or functionalized, R' is a hydrocarbon radical of 1 to 8 carbon atoms which if desired is also 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 H2n O- or -CH2-CH2-O-C n H2n O-, where n = 2 to 12; X = -C n H2n- or -C6H4-, where n = 2 to 12; Y = -C m H m-, in which m = 1 to 8.