Rohm and Haas Company

Michael S Cholod

Joseph W Nemec

Nipun M Shah

A copolyester of polyethylene terephthalate and bis (4-beta hydroxy ethoxy phenyl) sulfone 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 5 mole percent of bis (4-beta hydroxy ethoxy phenyl) sulfone in the presence of a suitable metallic catalyst system.

Copolyester of polyethylene terephthalate and bis (4-beta hydroxy ethoxy

The present invention relates to a process of the conversion of tert-butyl alkanoates to methacrolein or methacrylonitrile, and more particularly to a process for the conversion of tert-butyl acetate to methacrolein or methacrylonitrile.

Preparation of methacrolein and methacrylonitrile from tert-butyl

A copolyester of polyethylene terephthalate and sulfonyl diphenol and a process for its preparation are provided. The copolyester has an instrinsic 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.

Copolyester of polyethylene terephthalate and sulfonyl diphenol

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

In a process for the preparation of acetone cyanohydrin by the reaction of acetone and hydrocyanic acid in the presence of a sodium hydroxide catalyst, the method of removal of corrosion inducing sodium ion during the purification of the crude acetone cyanohydrin, involving the steps of (1) passing a cooled crude acetone cyanohydrin feedstream through a cationic ion exchange resin to remove substantially all of the sodium ion; (2) regenerating exhausted ion exchange resin; (3) acidifying the substantially sodium ion-free crude feedstream to a pH of 1.5-2.0 to stabilize said crude acetone cyanohydrin; (4) feeding the acidified substantially sodium ion-free crude feedstream to a first concentrator; (5) removing overhead, from the first concentrator, unreacted acetone and sending the bottoms from said first concentrator to a second concentrator; and (6) removing purified acetone cyanohydrin as bottoms from the second concentrator and recycling the overhead for further generation of acetone cyanohydrin.

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Cornwells Heights, PA, United States of America

Michael S Cholod