Method for preparing diahydrohexitol diester compositions
US8609872B2 · kind B2 · utility
1Cited by
3References
17Claims
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Key dates
| Filing date | Jan 12, 2012 |
| Grant date | Dec 17, 2013 |
| Priority date | — |
| Expiry date | Jun 30, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D493/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A dianhydrohexitol diester composition is obtained by esterifying a dianhydrohexitol composition with a carboxylic acid in the presence of an acid catalyst and hypophosphorous acid. Preferably, the hypophosphorous acid is introduced in an amount between 0.05 and 2 wt. percent of dianhydrohexitol, and in a hypophosphorous acid/acid catalyst weight ratio of less than 1/1. Dianhydrohexitol diester compositions, for example isosorbide diesters, isomannide and/or isoidide rich in diester(s), and having a low yellow index (YI), are useful in numerous industrial applications, in particular in plastic compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.