Patent ID: 8221574
Filing Date: 2012-07-17
Classification: C08K,C09D

Abstract:
1. A composition for use as a removable top coat comprising by percentage dry weight, based on the total dry weight of components a), b) and c) combined: a) 40 to 80% of cellulose acetate butyrate ester, wherein the cellulose acetate butyrate ester is selected from (i) cellulose acetate butyrate having, on the average, butyryl content of 46 wt %, acetyl content of 2 wt %, hydroxyl content of 4.8 wt %, glass transition temperature 136° C., melting point 150-160° C., and molecular weight 20,000, and (ii) cellulose acetate butyrate having, on the average, butyryl content of 50 wt %, acetyl content of 3 wt %, hydroxyl content of 1.7 wt %, melting point 135-150° C., glass transition temperature 115° C., and molecular weight 40,000; b) 15 to 60% of at least one acrylic polymer, wherein the at least one acrylic polymer is selected from (i) methyl methacrylate copolymer having, on the average, molecular weight 105,000, glass transition temperature 45° C. and acid value of zero, (ii) copolymer of n-butyl methacrylate and methyl methacrylate having, on the average, molecular weight of approximately 60,000, glass transition temperature of 58° C. and acid value of 3, and (iii) copolymer of n-butyl methacrylate and methyl methacrylate, molecular weight of about 200,000, glass transition temperature of 48° C., and acid value 5.5; and c) 2 to 10% of a plasticizer, wherein the plasticizer is sucrose acetate isobutyrate; in an amount of solvent effective to dissolve the dry components of the composition, wherein the solvent comprises at least one organic solvent.