Curing agents for epoxy resins, use thereof and epoxy resin cured therewith
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United States of America Patent
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Issued Date -
Nov 10, 2005
app pub date -
Mar 3, 2005
filing date -
Sep 11, 2002
priority date (Note) -
Abandoned
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Abstract
Curing agents for epoxy resins are obtained by A) an addition of at least one aldehyde or ketone to at least one phosphonous acid derivative, followed by B) a condensation reaction of the adduct obtained with at least one diamino or polyamino compound. The resulting curing agents can be used alone or as co-curing agents for epoxy resins, and simultaneously as fire-retardants. Using the curing agents of the invention it is possible to prepare cured epoxy resins modified to be fire retardant which have a phosphorus content of at least 2.2% by weight without lowering the glass transition temperature (T.sub.g) to below 150.degree. C. Use of the curing agents and epoxy resins produceable therewith are other objects of the present invention.
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