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:
Apr. 02, 1991
Filed:
Jul. 22, 1988
Applicant:
Inventors:
Mitsuru Takahashi, Yamaguchi, JP;
Hideo Shuyama, Yamaguchi, JP;
Osamu Miyano, Yamaguchi, JP;
Yukihiro Tsutsumi, Yamaguchi, JP;
Assignee:
Tosoh Corporation, Yamaguchi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C11C / ;
U.S. Cl.
CPC ...
260408 ; 502551 ; 502596 ;
Abstract
Process for producing fluorine-containing aliphatic carboxylic acids having the general formula of Y--R.sub.f --Y' as defined herein by reaction of fluorine-containing aliphatic halogen compounds having the general formula of X--R.sub.4 --X' as defined herein with carbon dioxide under the presence of zinc in an organic solvent and hydrolysis of the reaction product, wherein the improvement comprises controlling the concentration of carbon dioxide in the organic solvent at a level of 0.3 to 5 mol/l.