Patent ID: 6387176
Filing Date: 2002-05-14
Classification: C04B,Y02W

Abstract:
A modified acrylic polymer prepared by reacting, in the presence of sulfuric acid or p-toluene sulfonic acid, 1 mol of a poly(acrylic acid) A-1 or a C1-C5-ester thereof, having a number average molecular weight of from 500 to 20,000, with 0.01-0.30 mol of a tertiary alkanolamine or a derivative thereof, represented by formula B-1, â€ƒand, optionally, with 0-0.80 mol of a monofunctional polyalkyleneglycol-monoalkylether, represented by formula D-1, Hoâ€”(CH2CHRO)xâ€”R3â€ƒâ€ƒD-1 â€ƒand/or optionally with 0-0.60 mol of an &agr;-amino-polyalkyleneglycol-&ohgr;-alkylether of formula E-1, H2Nâ€”(CH2CHRO)yâ€”R3â€ƒâ€ƒE-1 wherein each R independently represents a hydrogen atom or a methyl group; R1 and R2 independently represent a methyl group, a hydroxyethyl (CH2CH2OH) group, an acetoxyethyl (CH2CH2OCOCH3) group, a hydroxy-isopropyl (CH2â€”CHOHâ€”CH3) group, or an acetoxy-isopropyl(CH2â€”CHOCOCH3â€”CH3) group; R3 is a C1-C4-alkyl group, M represents hydrogen, a C1-C5-alkyl group or an alkali metal ion, an alkaline earth metal ion or an ammonium group or a mixture thereof; a is an integer of 5 to 270; x and y independently represent integers from 2-250, and wherein the monofunctional polyalkyleneglycol-monoalkylether of formula D-1, and/or the &agr;-amino-polyalkyleneglycol-&ohgr;-alkylether of formula E-1 is present during the reaction.