Water soluble,crosslinked condensation prod. - prepd. from a block copolymer of ethylene oxide and propylene oxide and di:isocyanate and crosslinking with water

摘要

Water sol., cross-linked, N-contg. condensation prods (I), the viscosity of which in aq. soln. increases with an increase in temp. and drops with a reduction in temp., are prepared by reaction of 1 mol. block copolymer HO-CCH2CH2O)x(CH2CH(Me)O)y(CH2CH2OeH (I) (where X is 50-250, y is 20-100 and the ratio x:y is 6.5:1 to 1:15) with >=1.5 mol. TDI or diisocyanate OCN -(CH2)-NCO (where n is 2-8) and crosslinking the prod. by addn. of water as well as opt. polyvalent alcohols, their alkoxylated prods. or cpds. contg. >=4 basic NH gps. A 10% aq. (I) soln. has a viscosity (20 degrees C) of 10-4500 in Pas. The viscosity changes are reversible (I) may be used to prevent dye migration and can be added to printing pastes in an amt. of 0.05-10%. (I) may also be used in aq. polymer solns. and dispersions. An increase in the viscosity of dispersions or solns. allows exact coatings even at high machine speeds.