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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.:

US 4189603 B1

PDFFull Text
Date of Patent:
Feb. 19, 1980

Filed:

Sep. 20, 1978

Process for producing high-quality terephthalic acid suitable for use in

Applicant:
Inventors:

Motoo Shigeyasu, Matsuyama, JP;

Hatsutaro Yamazaki, Matsuyama, JP;

Takehiko Kitamura, Matsuyama, JP;

Assignees:

Matsuyama Petrochemicals Inc., Osaka, JP;

Maruzen Oil Co., Ltd., Osaka, JP;

Attorney:

Sughrue, Rothwell, Mion, Zinn and Macpeak

Primary Examiner:

Alan Siegel

Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
562417 ; 562421 ;
Abstract

A process for producing terephthalic acid of high quality suitable for use in direct polymerization comprising oxidizing a para-dialkylbenzene and/or an oxidized intermediate thereof in the liquid phase with molecular oxygen or a molecular oxygen-containing gas in the presence of an oxidation catalyst containing a heavy metal in a lower aliphatic carboxylic acid solvent, the reaction being carried out in the presence of a specified amount of a phenol. Polyesters prepared from the resulting terephthalic acid have good color.

Find Patent Forward Citations

Shigeyasu, Motoo. (1980). Process for producing high-quality terephthalic acid suitable for use in (U.S. Patent No. 4189603). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4189603

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