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US 6,852,856 B2Granted
Method for preserving quaternary ammonium salt
AssigneeTokuyama Corporation
InventorsNaoki Hirano, Masako Saijyo
Life of this patent
Estimating the term…
Abstract
A method of improving the stability of a quaternary ammonium salt and a method of efficiently preparing the quaternary ammonium salt having improved stability.
Claims3
A method of preserving a quaternary ammonium salt having a purity equal to or less than 99.8%, the quaternary ammonium salt being represented by the following general formula (I),
- wherein R1 is an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 8 carbon atoms, R2 is an alkyl group having 1 to 4 carbon atoms, and X is a halogen atom,
- said purity of quaternary ammonium salt being determined by chromatographic analysis peak area % measured by using a high-performance liquid chromatography and wherein water is not an impurity, the method comprising the steps of:
- preparing a hydrous quaternary ammonium salt consisting of 60 to 99% by weight of said quaternary ammonium salt and 40 to 1% by weight of water by adjusting a content of water in the salt, and
- preserving the thus obtained hydrous quaternary ammonium salt.
1 more element
A hydrous quaternary ammonium salt consisting of 60 to 99% by weight of a quaternary ammonium salt and 40 to 1% by weight of water having a purity equal to or less than 99.8%, the quaternary ammonium salt being represented by the following general formula (I),
- wherein R1 is an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 8 carbon atoms, R2 is an alkyl group having 1 to 4 carbon atoms, and X is a halogen atom,
- said purity of quaternary ammonium salt being determined by chromatographic analysis peak area % measured by using a high-performance liquid chromatography and wherein water is not an impurity.
Dependencies are inferred from the claim text.