Patent ID: 8039531

Claim:
A coating composition comprising a cellulose mixed ester, at least one crosslinking agent; at least one solvent; and optionally, at least one resin; wherein said cellulose mixed ester is in an amount ranging from about 51% by weight to about 100% by weight, based on the total weight of said cellulose mixed ester and said resin, and wherein said cellulose mixed ester is selected from the group consisting of: a) a cellulose mixed ester having the following properties: a total degree of substitution per anhydroglucose unit of from 3.08 to 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; b) a cellulose mixed ester having the following properties: a total degree of substitution per anhydroglucose unit of from 3.08 to 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 c) a cellulose mixed ester having the following properties: a total degree of substitution per anhydroglucose unit of from 3.08 to 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 2.11 to about 2.91, and a degree of substitution per anhydroglucose unit of acetyl of from about 0.10 to about 0.50; 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.