Process for the preparation of condensed phosphoric acid esters
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United States of America Patent
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Aug 12, 2003
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N/A
app pub date -
May 3, 2002
filing date -
Nov 5, 1999
priority date (Note) -
Expired
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Abstract
An objective of the present invention is to provide a method for preparing a high-purity, condensed phosphoric ester made of a bisphenol A derivative and having a very low content of monomer-type phosphoric ester that causes reduction in the heat resistance and the contamination of the molds during the molding when the condensed phosphoric ester is used as an additive for a resin. According to the present invention, a bisphenol A derivative, a phosphorus oxytrihalide and a hydroxy compound are reacted in the presence of a decomposition retardant, whereby the above problems can be solved.
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