Process for preparation of highly concentrated free-flowing aqueous solutions of betaines
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United States of America Patent
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Oct 5, 1999
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Nov 24, 1997
filing date -
Apr 29, 1995
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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.
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