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. 19, 1988
Filed:
Nov. 19, 1986
Toshio Nozaki, Sakura, JP;
Tomihiro Kurosaki, Sennan, JP;
Junya Wakatsuki, Wakayama, JP;
Kiyoshi Aimono, Wakayama, JP;
Kao Corporation, Tokyo, JP;
Abstract
A phosphoric ester salt of high purity is produced by converting a phosphoric ester in a mixture containing the phosphoric ester and one or more nonionic compounds into a phosphoric ester salt by using a basic compound, and extracting nonionic compounds from the above mixture by using a mixed solvent of aliphatic hydrocarbons or cycloaliphatic hydrocarbons, a lower alcohol and water. The above method is applicable to a non-crystalline phosphoric ester from which nonionic compounds cannot be removed by recystallization. The above obtained phosphoric ester salt of high purity can be used as it is or after condensation.