Copolyester of polyethylene terephthalate and sulfonyl diphenol

Details Copolyester of polyethylene terephthalate and sulfonyl diphenol Copolyester of polyethylene terephthalate and sulfonyl diphenol

C - Chemistry, Metallurgy

08

G

402/211

C08G 63/68 (2006.01) C08G 63/688 (2006.01)

Patent

CA 1199148

- 1 - PATENT APPLICATION OF MICHAEL S. CHOLOD for COPOLYESTER OF POLYETHYLENE TEREPHTHALATE AND SULFONYL DIPHENOL Abstract of the Disclosure A copolyester of polyethylene terephthalate and sulfonyl diphenol and a process for its preparation are provided. The copolyester has an intrinsic viscosity, glass transition temperature, and impact strength comparable to polyethylene terephthalate homopolymer but exhibits an increased crystallization time and is capable of being molded into clear articles. The process for preparing the copolyester comprises the steps of forming a polyethylene terephthalate prepolymer and polycondensing the prepolymer, preferably in the solid phase, with from about 2 to about 20 mole percent of sulfonyl diphenol in the presence of a suitable metallic catalyst system.

438725

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