High strength pigment binders for paper coatings containing carboxylated vinyl ester alkyl acrylic interpolymers
AssigneeNational Starch and Chemical Corporation
InventorsJosephine M. Rosenski, Joseph M. Fernandez
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Abstract
High strength pigment binders for paper coating having increased water retention and stability are disclosed. The coating compositions comprise an aqueous synthetic polymer latex and pigment and may contain other additives used in the art of pigmented paper coating. The latex comprises a dispersed interpolymer of a vinyl ester, a polyethylenically unsaturated comonomer and a ethylenically unsaturated mono- or dicarboxylic acid and optionally an alkyl acrylate.
Claims11
A pigmented paper coating composition comprising an aqueous synthetic polymer latex binder, pigment and sufficient alkali to achieve a pH of 6 to 10, the latex comprising dispersed therein an interpolymer having a T.sub.g value of +30.degree. to -40.degree. C. which consists essentially of:
- (a) a vinyl ester of an alkanoic acid having one to 13 carbon atoms interpolymerized with the following comonomers:
- (b) from 0 to 75% by weight of an alkyl acrylate;
- (c) from 0.01 to 1 parts per 100 parts (a) and (b) of a polyethylenically unsaturated comonomer selected from the group consisting of triallyl cyanurate, triallyl isocyanurate, diallyl maleate, diallyl fumarate, divinyl benzene and diallyl phthalate;
- and
- (d) from 0.5 to 15 parts per 100 parts (a) and (b) of an ethylenically unsaturated mono- or dicarboxylic acid or the half esters thereof.
Dependencies are inferred from the claim text.