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Abstract

This disclosure relates to thermosetting compositions suitable for use in making electronic materials such as circuit board substrates, as well as cured compositions, prepregs and laminates based on such thermosetting compositions. One aspect of the disclosure is a thermosetting composition comprising: an aromatic epoxy resin component; a poly(styrene-co-maleic anhydride) component; a maleimide-bearing oligomer component; the maleimide-bearing oligomer component having an average of at least 4 maleimides per molecule, on a number average, and a softening point of no more than 100° C.; a benzoxazine/maleimide component, that is a bis(benzoxazine) subcomponent and a bis(maleimide) subcomponent, and/or a reaction product thereof; an aromatic primary diamine component; microparticulate silica; an organic halogen-free fire retardant component; an effective amount of one or more catalysts.

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First Claim