Patent · US Expired

Process for preparation of highly concentrated free-flowing aqueous solutions of betaines

US5962708A · kind A · utility

5Cited by

5References

16Claims

0Family size

Assignee

Witco Surfactants GmbH · DE

Inventors

Ingo Hamann · Mount Olive, US
Hans-Jurgen Kohle · Leingarten, DE
Winfried Wehner · Hachenburg, DE

Key dates

Filing date	Nov 24, 1997
Grant date	Oct 5, 1999
Priority date	—
Expiry date	Nov 24, 2017

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S516/918
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

The invention relates to a process for the preparation of highly concentrated free-flowing and pumpable aqueous solutions of betaines by quaternization of a compound which contains tertiary amine nitrogen with a .omega.-halo carboxylic acid characterized in that 0.5-5% by weight of the final product, of a viscosity-reducing compound such as an alkali or alkaline earth metal citric acid salt is added to the reaction mixture before or during the quaternization reaction.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.