Patent ID: 7396896

Claim:
A poly(trimethylene dicarboxylate) prepared by polycondensation of: (a) a glycol component comprising 1,3-propanediol; (b) aliphatic or aromatic diacid or diester; and (c) from about 0.01 to about 0.2 mole %, based on the total number of moles of said glycol component and diacid or ester, of polyfunctional reactant containing three or more carboxylic acid type groups or hydroxy groups; wherein comonomers in the glycol component other than 1,3-propanediol are not more than 10% by weight of said glycol component; wherein said poly(trimethylene dicarboxylate) further comprises comonomer repeat units derived from the group consisting of ethylene glycol, 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propane diol, and C 6 -C 12 diols; and wherein said polyfunctional reactant is not pyromellitic dianhydride.