HIGH TEMPERATURE EPOXY RESINS

摘要

A multi-functional epoxy resin with good high temperature properties allowing prolonged service at temperatures above 120 DEG C is derived from a precursor of formula (I), in which R<3> to R<8> inclusive are independently selected from hydrogen, C1 to C3 alkyl or halo-alkyl and R<9> is hydrogen, alkyl or halogen, and in which n has the value 0, 1 or 2. The precursor (I) may be self-coupled or cross-coupled with precursors of other epoxy compounds of the TGDDM type. Such cross-coupling gives rise to a complex mixture containing not only the mixed product, but also the self-coupled products of each constituent. Regardless of the precise chemical make-up of the mixture, the observed glass transition temperature is higher than for TGDDM resins formed without precursor (I). If the substituent at the R<9> position is alkyl or halogen, oligomer formation is suppressed and a less complex mixture results.