Preparation of hydroxyphenyl phosphine oxide mixtures
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United States of America Patent
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Jul 12, 2016
Grant Date -
Aug 7, 2014
app pub date -
Feb 4, 2013
filing date -
Sep 11, 2009
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Abstract
A hydroxyphenyl or alkoxyphenyl phosphine oxide composition comprising (i) a first mixture of mono-(hydroxyphenyl) or (alkoxyphenyl)phosphine oxide isomers, (ii) a second mixture of bis-(hydroxyaryl) or (alkoxyphenyl)phosphine oxide isomers, (iii) a third mixture of tris-(hydroxyaryl) or (alkoxyphenyl)phosphine oxide isomers, and optionally iv) a minority amount of non-hydroxy or non-alkoxy tris-phenyl phosphine oxides is provided. Also provided are epoxy resins compositions with excellent flame retardancy and physical properties, which resins comprise the phosphine oxide composition.
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