Using novel amines to stabilize quaternary trialkylalkanolamines
US10264785B2 · kind B2 · utility
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15Claims
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Key dates
| Filing date | May 1, 2017 |
| Grant date | Apr 23, 2019 |
| Priority date | — |
| Expiry date | May 1, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K15/22
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
New stabilizers for solutions of choline hydroxide and related quaternary trialkylalkanolamines are disclosed. The stabilizers are alkyl hydroxylamines, hydrazines, hydrazides, or derivates thereof, including compounds containing more than one such functionality. The new stabilizers are effective at concentrations less than about 1000 ppm, and choline hydroxide solutions stabilized with the compounds described herein typically have Gardner Color change less than about 2.0 after six months at reasonable temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.