Halogen-free flameproof epoxy resin formulations
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United States of America Patent
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May 31, 2011
Grant Date -
Aug 21, 2008
app pub date -
Dec 12, 2006
filing date -
Mar 31, 2006
priority date (Note) -
Expired
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Abstract
The invention relates to a method for preparing halogen-free flameproof epoxy resins, in which a halogen-free epoxy resin is reacted with a polyfunctional aldehyde or ketone and a phosphinic acid derivative, wherein the phosphinic acid derivative contains at least one P—H-active structural unit of the formula ═PH(O) and is used in an amount equivalent to the polyfunctionality of the aldehyde or ketone, to a halogen-free flameproof epoxy resin obtainable by this method, to the use of the epoxy resin as a base material for the manufacture of printed circuit boards and printed circuits and to intermediates used to prepare the epoxy resins.
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