WASSERLOESLICHE COPOLYMERISATE, VERFAHREN ZU IHRER HERSTELLUNG UND IHRE VERWENDUNG.

摘要

Water-sol. copolymer (A) having K value 15-120 (measured by the method of Fikentscher on an aq. soln. of 1 wt.% Na salt at 25 deg.C and pH 7) comprises (mole.%) (a) 99.5-80% at least one monoethylenically unsatd. 3-6C monocarboxylic acid (I); (b) 0.5-20% at least one comonomer (II) with at least 2 ethylenic unsatd. but non-conjugated double bonds and (c) 0-30% other, copolymerisable, water-sol., monoethylenically unsatd. monomers (III). The copolymer consists of segments derived from (I) and (III) of mol. wt. not over 15,000, bonded together by (II) units. (II) are esters prepd. from (1) a (I) and (2) a polyhydric 2-6C alcohol; water-sol. or -insol. polyalkylene glycol of mol. wt. up to 400; water-sol. polyalkylene glycol of mol. wt. over 400-10,000; polyglycerols of mol. wt. up to 2000; polyvinyl alcohols of mol. wt. up to 10,000, and monovalent monoethylenically unsatd. 3-6C alcohols. Specifically, the acid component of (II) is (meth) acrylic acid; crotonic acid, vinylacetic acid and/or methacrylic anhydride, and the (I) segments are of mol. wt. 300-8000.