Patent ID: 8324316

Claim:
An unsaturated polyester resin, comprising: A. diacid residues comprising about 10 to about 90 mole percent of the residues of at least one diacid chosen from 1,4-cyclohexanedicarboxylic acid, 1,2-hexahydrophthalic acid, isophthalic acid, terephthalic acid, phthalic acid, and 1,3-cyclohexanedicarboxylic acid, based on the total moles of diacid residues, and about 90 to about 10 mole percent of the residues of 2-butenedioic acid; and B. diol residues comprising about 20 to about 90 mole percent of the residues of 2,2,4,4-tetramethyl-1,3-cyclobutanediol and about 80 to about 10 mole percent of the residues of 1,2-propanediol, based on the total moles of diol residues; wherein said polyester has a number average molecular weight of about 300 to about 10,000 daltons; a glass transition temperature of about 0 to about 125° C.; an acid number of 0 to about 50 mg KOH/g of polyester resin; and an ICI viscosity of about 5 to about 70 poise at a temperature of 175 to 200° C.