Invert size for the pulp sizing and surface sizing of paper

Abstract From the Canadian patent

An invert size for the engine and tub sizing of paper. It contains an aqueous dispersion of a fortified unfortified, hydrogenated, or disproportionated and optionally esterified rosin or mixture of such rosins and of a dispersant that contains digested casein or an emulsifier of the general formula, R-(OCH2CH2)n-O-A? Mx+ (I), wherein R is an alkylphenyl alkyl, or alkenyl group or a, cycloalkyl group with condensed rings A is a group with the, formula -CH2COO or -SO3 Mx+ is a cation, x is 1 or 2, and n, is a number such that approximately 21 to 76% of the molecular weight of the anion is in the -OCH2CH2 group. To allow sizing control, the dispersant also contains cationic starch.