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:
Nov. 25, 1986
Filed:
Jun. 22, 1984
Applicant:
Inventors:
Takeshi Shibano, Yokkaichi, JP;
Yasuyuki Sakakura, Yokkaichi, JP;
Kiichi Ito, Yokkaichi, JP;
Kazuhiko Higuchi, Yokkaichi, JP;
Assignee:
501 Mitsubishi Petrochemical Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
562600 ; 562532 ; 562534 ; 562535 ; 562545 ; 562546 ; 562547 ; 560218 ;
Abstract
A 1,2-unsaturated carboxylic acid or its ester such as acrylic or methacrylic acid or its alkyl ester is purified to remove aldehyde impurities contained therein by treating the acid or its ester with a mercapto containing compound in the presence of an acid catalyst.