Patent ID: 7432395

Claim:
A carboxylic acid composition comprising: (1) a carboxylic acid in an amount greater than 50 percent by weight; (2) (a) carboxybenzaldehyde isomers in an amount ranging from 1 ppm to 1000 ppm; or (b) toluic acid isomers in an amount ranging from 1 ppm to 1000 ppm; or both (2) (a) and (2) (b); and (3) at least two of the following: (a) phthalic acid isomers in an amount ranging from 50 ppm to 49 wt %; (b) benzene-tricarboxylic acid isomers in an amount ranging from 140 ppm to 1000 ppm; (c) dicarboxybiphenyl isomers in an amount ranging from 25 ppm to 49 wt %; (d) phthalic acid in an amount ranging from 20 ppm to 49 wt %; (e) hydroxybenzoic acid isomers in an amount ranging from 3 ppm to 1000 ppm; (f) hydroxymethylbenzoic acid isomers in an amount ranging from 40 ppm to 49 wt %; and (g) benzoic acid in an amount ranging from 60 ppm to 1000 ppm; wherein the compound chosen in (1) is different than the compounds chosen in (3); and wherein the compound or compounds chosen in (2) are different from the compounds chosen in (3) and the compound chosen in (1).