Patent ID: 8461234

Claim:
A refinish coating composition comprising: a) at least one refinish coating resin; b) at least one solvent; c) at least one pigment; d) optionally, at least one crosslinking agent; e) at least one cellulose mixed ester having a weight average molecular weight (M w ) greater than 10,000; and f) at least one low molecular weight cellulose mixed ester selected from the group consisting of: (1) a low molecular weight cellulose mixed ester having: a total degree of substitution per anhydroglucose unit of from 3.08 to about 3.50, having the following substitutions: a degree of substitution per anhydroglucose unit of hydroxyl of no more than about 0.70, a degree of substitution per anhydroglucose unit of C 3 -C 4 esters from about 0.80 to about 1.40, and a degree of substitution per anhydroglucose unit of acetyl of from about 1.20 to about 2.34; an inherent viscosity of from 0.05 to 0.12 dL/g, as measured in a 60/40 (wt./wt.) solution of phenol/tetrachloroethane at 25° C.; a number average molecular weight (M n ) of from about 1,000 to about 5,600; a weight average molecular weight (M w ) of from about 1,500 to about 10,000; and a polydispersity of from about 1.2 to about 3.5; (2) a low molecular weight cellulose mixed ester having: a total degree of substitution per anhydroglucose unit of from 3.08 to about 3.50, having the following substitutions: a degree of substitution per anhydroglucose unit of hydroxyl of no more than about 0.70; a degree of substitution per anhydroglucose unit of C 3 -C 4 esters from about 1.40 to about 2.45, and a degree of substitution per anhydroglucose unit of acetyl of from about 0.20 to about 0.80; an inherent viscosity of from 0.05 to 0.12 dL/g, as measured in a 60/40 (wt./wt.) solution of phenol/tetrachloroethane at 25° C.; a number average molecular weight (M n ) of from about 1,000 to about 5,600; a weight average molecular weight (M w ) of from about 1,500 to about 10,000; a polydispersity of from about 1.2 to about 3, (3) a low molecular weight cellulose mixed ester having: a total degree of substitution per anhydroglucose unit of from 3.08 to about 3.50, having the following substitutions: a degree of substitution per anhydroglucose unit of hydroxyl of no more than about 0.70; a degree of substitution per anhydroglucose unit of C 3 -C 4 esters from about 1.40 to about 2.45, and a degree of substitution per anhydroglucose unit of acetyl of from about 0.20 to about 0.80; an inherent viscosity of from 0.05 to 0.12 dL/g, as measured in a 60/40 (wt./wt.) solution of phenol/tetrachloroethane at 25° C.; a number average molecular weight (M n ) of from about 1,000 to about 5,600; a weight average molecular weight (M w ) of from about 1,500 to about 10,000; and a polydispersity of from about 1.2 to about 3.5; and mixtures of said low molecular weight cellulose mixed esters.