Process for the preparation of aromatic phosphonites and aromatic phosphinites and the products made by the process thereof
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United States of America Patent
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Mar 26, 2002
Grant Date -
N/A
app pub date -
Mar 10, 2000
filing date -
Sep 1, 1998
priority date (Note) -
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Abstract
A novel process is described for preparing phosphonites or phosphinites by reacting a product of a Friedel-Crafts reaction with alcohols or phenols and separating off the byproducts formed. The novelty is the aftertreatment with a protic compound, or with an oxide, hydroxide, (hydrogen)carbonate resp. (hydrogen)phosphate of a metal or with a nitrogen containing compound (as defined in claim 1), or with any combination of one or more substances of the above mentioned compound classes. Products having a low halide and aluminum content are obtained which are distinguished by an improved clear solubility and an improved action as stabilizer for polymeric materials.
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