초록 ▼

Lightweight coated paper articles having a desirable combination of properties are obtained through the use of coating compositions employing as the binder component thereof certain novel polymeric dispersions which comprise a major proportion on a dry basis of an alkali insoluble polymer and a mino

Lightweight coated paper articles having a desirable combination of properties are obtained through the use of coating compositions employing as the binder component thereof certain novel polymeric dispersions which comprise a major proportion on a dry basis of an alkali insoluble polymer and a minor proportion (e.g., from about 0.5 to about 25 weight percent on a dry basis based upon the alkali insoluble polymer) of certain alkali soluble polymers. Exemplary of the alkali insoluble polymers employed herein are both the carboxylated and noncarboxylated versions of known addition polymerized synthetic polymers having a glass transition temperature of about 50°C. or less. Exemplary of the alkali soluble polymers employed herein are synthetic addition polymers comprising (in polymerized form and in weight percent based on such polymer) from about 40 to about 90 percent of a vinyl ester of a carboxylic acid (e.g., vinyl acetate, vinyl propionate, etc.); from about 5 to about 55 percent of the nitrile or a C1-C8 alkyl ester of a monoethylenically unsaturated carboxylic acid; and from about 5 to about 15 percent of a monoethylenically unsaturated carboxylic acid.

대표청구항 ▼

An aqueous polymer dispersion containing: (a) from about 10 to about 60 weight percent based upon the total dispersion weight of an alkali insoluble polymer having a glass transition temperature equal to or less than about 50°C. and (b) from about 0.5 to about 25 weight percent based upon the alkali

An aqueous polymer dispersion containing: (a) from about 10 to about 60 weight percent based upon the total dispersion weight of an alkali insoluble polymer having a glass transition temperature equal to or less than about 50°C. and (b) from about 0.5 to about 25 weight percent based upon the alkali insoluble polymer of an alkali soluble synthetic addition polymer comprising, in polymerized form and based upon the weight of such alkali soluble polymer, (1) from about 40 to about 90 percent of a vinyl ester of a non-addition polymerizable carboxylic acid; (2) from about 5 to about 55 percent of a nitrile, a C2 to about C4 hydroxyalkyl ester or a C1 to about C8 alkyl ester of a monoethylenically unsaturated carboxylic acid; and (3) from about 5 to about 15 percent of a monoethylenically unsaturated carboxylic acid. An aqueous coating composition comprising a pigment and the aqueous polymeric dispersion of claim 1 as a binder. The aqueous coating composition of claim 12 wherein the amount of the polymer solids of the aqueous polymeric dispersion is from about 3 to about 30 parts by weight per 100 parts by weight of the pigment, all parts being on a dry basis. A coated paper product comprising a paper sheet carrying a dried deposit of the coating composition of claim 13. The coated paper product of claim 14 wherein the amount of the dried coating composition on each coated surface of the paper sheet is from about 3 to about 30 grams per square meter on a dry basis and based upon the surface area of such coated surface.