Rohm and Haas Company

Nipun M Shah

Michael S Cholod

A polyethylene terephthalate polycondensation catalyst system comprises from about 2 parts to about 18 parts of catalyst metal in the form of an alkyl titanate and from about 40 parts to about 300 parts of catalyst metal in the form of an antimony compound, each of said metals being per million parts of polymer product.

Catalyst system for a polyethylene terephthalate polycondensation

Amorphous polyethylene terephthalate can be polycondensed in the solid phase to a higher molecular weight product by a continuous process involving preheating the polymer under forced motion, at least partially crystallizing the preheated polymer in a fixed bed, and polycondensing the polymer in a forced motion reactor at temperatures in the range of 220.degree. to 245.degree. C.

Growing community of inventors

Fayetteville, NC, United States of America

Nipun M Shah