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:
Oct. 15, 1985
Filed:
Apr. 26, 1984
Henkel KgaA, Duesseldorf, DE;
Abstract
This invention is directed to a process for the preparation of color-stable, light-colored aqueous salt pastes of wash-active esters of .alpha.-sulfofatty acids with monohydric C.sub.1 -C.sub.8 -alcohols by a combined bleaching treatment of dark-colored .alpha.-sulfofatty acid ester salt paste with hydrogen peroxide and alkali metal hypochlorite. According to the process, dark-colored .alpha.-sulfofatty acid ester salt paste is first subjected in a preliminary bleaching step to bleaching with alkali metal hypochlorite in a neutral to mildly alkaline aqueous medium, any excess metal hypochlorite is removed, and the paste is subjected in a final bleaching step to bleaching in a mildly acidic medium with hydrogen peroxide or with one or more compounds which yield hydrogen peroxide.