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:
Jan. 27, 2015
Filed:
Dec. 22, 2010
Takeshi Shirasawa, Wakayama, JP;
Yasuo Amishige, Wakayama, JP;
Kaoru Omae, Wakayama, JP;
Akira Matsunaga, Wakayama, JP;
Akira Sakaguchi, Wakayama, JP;
Takeshi Shirasawa, Wakayama, JP;
Yasuo Amishige, Wakayama, JP;
Kaoru Omae, Wakayama, JP;
Akira Matsunaga, Wakayama, JP;
Akira Sakaguchi, Wakayama, JP;
Kao Corporation, Tokyo, JP;
Abstract
The present invention provides a method for producing polyoxyalkylene alkyl ether carboxylic acid and a salt thereof, including supplying polyoxyalkylene alkyl ether, oxygen, and water to a continuous stirred tank reactor containing a noble metal catalyst to oxidize the polyoxyalkylene alkyl ether with oxygen, in which the molar ratio of the salt of polyoxyalkylene alkyl ether carboxylic acid to the polyoxyalkylene alkyl ether in the continuous stirred tank reactor is controlled to 0.33 to 49.