초록 ▼

The present invention provides certain carboxymethyl cellulose (CMC) esters of higher acids (e.g., CMC acetate propionate, CMC propionate, CMC acetate butyrate, and CMC butyrate)having specific use in aqueous dispersions useful in formulating waterborne coating compositions containing pigments, espe

The present invention provides certain carboxymethyl cellulose (CMC) esters of higher acids (e.g., CMC acetate propionate, CMC propionate, CMC acetate butyrate, and CMC butyrate)having specific use in aqueous dispersions useful in formulating waterborne coating compositions containing pigments, especially metallic pigments such as aluminum flakes and mica. The esters also have specific use as wetting agents and in high solids coatings.

대표청구항 ▼

[ We claim:] [1.] An aqueous pigment dispersion comprising about 10 to 90 weight percent by weight of a pigment and about 90 to 10 weight percent of a C.sub.2 -C.sub.4 ester of carboxy (C.sub.1 -C.sub.3) alkyl cellulose having an inherent viscosity of 0.20 to 1.7 dL/g, as measured in a 60/40 (wt./wt

[ We claim:] [1.] An aqueous pigment dispersion comprising about 10 to 90 weight percent by weight of a pigment and about 90 to 10 weight percent of a C.sub.2 -C.sub.4 ester of carboxy (C.sub.1 -C.sub.3) alkyl cellulose having an inherent viscosity of 0.20 to 1.7 dL/g, as measured in a 60/40 (wt./wt.) solution of phenol/tetrachloroethane at 25.degree. C., a degree of substitution per anhydroglucose unit of carboxy(C.sub.1 -C.sub.3 alkyl) of about 0.20 to 0.75, and a degree of substitution per anhydroglucose unit of C.sub.2 -C.sub.4 esters of about 1.5 to about 2.7.