Method for preparing diahydrohexitol diester compositions
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United States of America Patent
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Dec 17, 2013
Grant Date -
May 10, 2012
app pub date -
Jan 12, 2012
filing date -
Apr 1, 2005
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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.
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