Patent ID: 7884233
Filing Date: 2011-02-08
Classification: C07C,Y10T

Abstract:
1. A terephthalic acid composition suitable for making PET (polyethylene terephthalate) polymer comprising: (1) terephthalic acid in an amount greater than 50 percent by weight; (2) (a) 4-carboxybenzaldehyde in an amount ranging from 1 ppm to 1000 ppm; or (3) at least one of the following: and wherein said terephthalic acid composition has a total monofunctional compound(s) concentration less than 0.5 mole %; and wherein said terephthalic acid composition has an average functionality, not including zero functionality species ranging from 1.995 to 2.005 on a mole basis wherein the functional value for any particular molecule in said terephthalic acid composition is equal to the total number of reactive carboxyl and reactive hydroxyl groups present in said molecule.