The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 16, 1982
Filed:
Apr. 25, 1980
Shozaburo Imai, Akashi, JP;
Hiroaki Sugimoto, Yao, JP;
Sumitomo Chemical Company, Limited, Osaka, JP;
Abstract
A process for producing oxybenzoyl copolyesters comprising 3 to 300 of repeating unit of the formula, ##STR1## wherein m and n are each 0 or 1, and W is --O--, --SO.sub.2 --, --S-- or --CO--, which comprises reacting a compound of the formula, ##STR2## wherein R.sup.1 is a hydrogen atom, a benzyl, lower alkyl or phenyl group, and Y is a hydrogen atom or a lower alkanoyl group, with a compound of the formula, ##STR3## wherein X is a halogen atom, in the presence of an aliphatic, alicyclic or aromatic hydrocarbon solvent having a boiling point of 100.degree. to 260.degree. C. under atmospheric pressure to produce bis(carboxyphenyl)phthalate, adding a compound of the formula, ##STR4## wherein W is --O--, --SO.sub.2 --, --S-- or --CO--, Z is a hydrogen atom or an alkanoyl group, and m and n are each 0 or 1, and optionally a compound of the formula, ##STR5## wherein R.sup.2 and R.sup.3 are each a hydrogen atom, a benzyl, lower alkyl or phenyl group, and carrying out polycondensation with the removal of the solvent and byproducts so that the polycondensation system is made substantially free from the solvent at least at the end of the polycondensation to carry out substantial bulk polycondensation.