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:
Sep. 04, 2012
Filed:
Mar. 11, 2009
Hidemasa Aoki, Kawasaki, JP;
Akio Kuroiwa, Kawasaki, JP;
Akira Shibuya, Kawasaki, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
An object of the present invention is to provide a method for industrially producing β-mercapto carboxylic acids that are useful as synthetic raw materials for medicines and agrochemicals or as additives for polymer compounds from easily available α,β-unsaturated carboxylic acids in high yields and productivity. The present invention is characterized in that a solvent having an amide group and represented by the formula (1) is used when the α,β-unsaturated carboxylic acids are reacted with hydrogen sulfides to produce the β-mercapto carboxylic acids. Particularly, it is more preferable to carry out the reaction at a pH range of 6.0 to 8.5: (In the formula (1), Rrepresents any one of a hydrogen atom, an alkoxy group having 1 to 5 carbon atoms, an alkyl group having 1 to 5 carbon atoms, an amino group, and an alkylamino group having 1 to 5 carbon atoms; Rand Reach represents independently any one of a hydrogen atom and an alkyl group having 1 to 5 carbon atoms; when both Rand Rare not a hydrogen atom, Rand Rmay together form a ring structure through an alkylene group; and when both Rand Rare not a hydrogen atom, Rand Rmay form a ring structure through an alkylene group).