A refinish coating composition is provided 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 (Mw) greater than 10,000 and
A refinish coating composition is provided 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 (Mw) greater than 10,000 and f) at least one low molecular weight cellulose mixed ester. In addition, processes for coating the refinish coating composition on a substrate are also provided.
대표청구항▼
1. 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 (Mw) greater than 10,000; and f) at l
1. 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 (Mw) 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 C3-C4 esters from about 0.80 to about 1.40, anda 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 (Mn) of from about 1,000 to about 5,600;a weight average molecular weight (Mw) of from about 1,500 to about 10,000; anda 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 C3-C4 esters from about 1.40 to about 2.45, anda 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 (Mn) of from about 1,000 to about 5,600;a weight average molecular weight (Mw) 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 C3-C4 esters from about 1.40 to about 2.45, anda 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 (Mn) of from about 1,000 to about 5,600;a weight average molecular weight (Mw) of from about 1,500 to about 10,000; anda polydispersity of from about 1.2 to about 3.5;and mixtures of said low molecular weight cellulose mixed esters. 2. The refinish coating composition according to claim 1, wherein the C3-C4 ester of said low molecular weight cellulose mixed ester comprises butyryl, and wherein said low molecular weight cellulose mixed ester forms a clear solution as a 10 weight percent mixture in at least one solvent selected from the group consisting of propylene glycol monomethyl ether, propylene glycol methyl acetate, diethylene glycol methyl ether, and mixtures thereof. 3. The refinish coating composition according to claim 1, wherein the C3-C4 ester in said low molecular weight cellulose mixed ester comprises propionyl. 4. The refinish coating composition according to claim 1, wherein the degree of substitution per anhydroglucose unit of hydroxyl in said low molecular weight cellulose mixed ester is from about 0.05 to about 0.70. 5. The refinish coating composition according to claim 1, wherein the number average molecular weight (Mn) of said low molecular weight cellulose mixed ester is from about 1,500 to about 5,000. 6. The refinish coating composition according to claim 1, wherein the polydispersity of said low molecular weight cellulose mixed ester is from 1.2 to 2.5. 7. The refinish coating composition according to claim 1, wherein the C3-C4 ester in said low molecular weight cellulose mixed ester comprises butyryl, and wherein said low molecular weight cellulose mixed ester exhibits a viscosity no greater than 6,000 centipoise as a 50 wt. % solution in a 90/10 by weight mixture of n-butyl acetate/xylene. 8. The refinish coating composition according to claim 1, wherein the C3-C4 ester of said low molecular weight cellulose mixed ester comprises butyryl, and wherein said low molecular weight cellulose mixed ester forms a clear solution as a 10 weight percent mixture in at least one solvent selected from the group consisting of C-11 ketone, diisobutyl ketone, propylene glycol monopropyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, methanol, toluene, and 90/10 by weight isopropyl alcohol/water blend. 9. The refinish coating composition according to claim 1 wherein said refinish coating resin is at least one selected from the group consisting of polyesters, polyester-amides, alkyds, polyurethanes, epoxy resins, polyamines, acrylics, vinyl polymers, polyisocyanates, melamines, phenolics, urea resins, urethane resins, polyamides, and other cellulose esters. 10. The refinish coating composition according to claim 1 wherein the total amount of said cellulose mixed ester and said low molecular weight cellulose mixed ester ranges from about 1% by weight to about 20% by weight based on the weight of said refinish coating composition. 11. The refinish coating composition according to claim 10 wherein the amount of said cellulose mixed ester to said low molecular weight cellulose mixed ester is in a ratio of up to 50:50 by weight based on the weight of said refinish coating composition. 12. The refinish coating composition according to claim 11 wherein the amount of said cellulose mixed ester to said low molecular weight cellulose mixed ester is in a ratio of 5:95; 10:90; 15:85; 20:80; 25:75; 30:70; 35:65; 40:60; or 45:55. 13. A shaped or formed article coated with the refinish coating composition of claim 1. 14. A process of coating a substrate said process comprising: a) applying at least one primer layer, b) applying at least one refinish coating composition layer to said primer layer, and c) applying at least one clearcoat layer to said refinish coating composition layer of claim 1. 15. A process of coating a substrate said process comprising: a) applying at least one primer layer to said substrate, b) applying at least one refinish coating composition layer to said primer layer, and c) applying at least one clearcoat layer to said refinish coating composition; wherein said refinish coating composition layer is applied when said primer layer is wet; wherein said refinish coating composition layer comprises said refinish coating composition according to claim 1. 16. A process of coating a substrate said process comprising: a) applying at least one primer layer to said substrate, b) applying at least one refinish coating composition layer to said primer layer, and c) applying at least one clearcoat layer to said refinish coating composition layer; wherein said clearcoat layer is applied when said refinish coating composition layer is wet; and wherein said refinish coating composition layer comprises said refinish coating composition according to claim 1. 17. A process of coating a substrate said process comprising: a) applying at least one primer layer to said substrate, b) applying at least one refinish coating composition layer to said primer layer, and c) applying at least one clearcoat layer to said refinish coating composition layer; wherein said refinish coating composition is applied when said primer layer is wet; wherein said clearcoat layer is applied when said refinish coating composition is wet; and wherein said refinish coating composition layer comprises said refinish coating composition according to claim 1.
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