Patent ID: 6310159
Filing Date: 2001-10-30
Classification: C09D,D21H

Abstract:
A paper surface sizing composition comprising a copolymer having:a) structural units derived from styrene;b) structural units derived from monomers selected from esters of ethylenically unsaturated mono-carboxylic acids, half-esters of ethylenically unsaturated dicarboxylic acids and mixtures thereof bearing a substituent R linked to the oxygen atom of the ester groups that is at each occurrence selected from:(i) polyalkyleneoxide groups corresponding to the formula: ##STR17##wherein R.sup.1 is independently at each occurrence selected from hydrogen and C.sub.1 -C.sub.4 alkyl, R.sup.2 is C.sub.1 -C.sub.44 hydrocarbyl, t is 0 or 1 and m is an integer in the range of 5 to 200, with the proviso that if R.sup.2 is C.sub.1 -C.sub.5 alkyl the polyalkyleneoxide group does not contain more than 50 weight percent ethyleneoxide moieties based on the weight of the polyalkyleneoxide group;c) structural units derived from ethylenically unsaturated monomers selected from acrylic acid, methacrylic acid, maleic acid, the salts thereof, maleic anhydride and mixtures thereof; and optionallyd) structural units derived from alkyl substituted alkyl acrylates or methacrylates.