Patent ID: 7078476

Claim:
A copolyester resin for solventborne coating composition, said copolyester resin prepared by polycondensing components consisting essentially of: (a) an acid component comprising 60–90 mol % of aromatic dicarboxylic acid selected from the group consisting of isophthalic acid, C1–C2 alkylester of isophthalic acid, phthalic acid, C1–C2 alkylester of phthalic acid, phthalic anhydride, and mixtures thereof, and 10–40 mol % of cycloaliphatic dicarboxylic acid selected from the group consisting of 1,2-cyclohexane dicarboxylic anhydride, 1,2-cyclohexane dicarboxylic acid, C1–C2 alkylester of 1,2-cyclohexane dicarboxylic acid, 1,4-cyclohexane dicarboxylic acid, C1–C2 alkylester of 1,4-cyclohexane dicarboxylic acid, and mixtures thereof; (b) an alcohol component comprising polyvalent alcohol present in an amount of 40% or less, and 60–100 mol % of 2,2-dialkyl-1,3-propanediol wherein said polyvalent alcohol is selected from the group consisting of cyclohexanedimethanol, propylene glycol, 2,2,4-trimethylpentanediol, tricyclodecanedimethanol, ethylene glycol, 2-methylpropanediol, butanediol, 1,6-hexanediol, and mixtures thereof, and said 2,2-dialkyl-1,3-propanediol is the mixture of 2-butyl-2-ethyl-1,3-propanediol and neopentyl glycol, and the 2-butyl-2-ethyl-1,3-propanediol is present in an amount of 10–55 mol % of the total alcohol component; and (c) a polyfunctional component having a functionality of three or higher, present in an amount of 5 mol % or less, based on the total moles of acid and alcohol components, wherein said polyfunctional component comprises polyacid, polyol, or mixtures thereof.