Heat-curable mixture containing substituted bicyclo (2.2.1) hept-5-ene-2,3-dicarboximide and polymaleimide, and ethylenically unsaturated phenolic compound

Claim 1

A heat-curable mixture comprising (a) 10-90% by weight of at least one compound of formula I ##STR21## (b) 90-10% by weight of at least one compound of formula II ##STR22## wherein n is 1 or 2 and m is 2 or 3, R when n is 1, is a hydrogen atom, C 1 -C 12 alkyl, C 3 -C 6 alkenyl, C 5 -C 8 cycloalkyl, C 6 -C 10 aryl or benzyl, or when n is 2, is --C p H 2p --, wherein p is 2 to 20, or is C 6 -C 10 arylene or a group of the formula III ##STR23## wherein T is methylene, isopropylidene, --CO--, --S-- or --SO 2 , R' is an organic radical of valency m which contains 2 to 30 carbon atoms, and R 1 , R 2 and R 3 are each independently a hydrogen atom or a methyl group; and (c) a maximum of 30%, based on the total weight of (a) and (b), of at least one compound which is able to react with component (b), said component (c) corresponding to the formulae ##STR24## wherein T 2 is a direct bond, or T 2 is methylene, isopropylidene, --O--, --S--, --SO-- or --SO 2 --, ##STR25## wherein R 4 , R 5 , R 6 and R 7 are each independently a hydrogen atom, an allyl or propenyl group, with the proviso that at least one of R 4 to R 7 is a propenyl group, and T is as previously defined, ##STR26## wherein R 4 , R 5 and R 6 are as previously defined and at least one of R 4 to R 6 is a propenyl group, and ##STR27## wherein R 8 , R 9 , R 10 , R 11 , R 12 and R 13 are each independently a hydrogen atom, C 1 -C 4 alkyl, allyl or propenyl, with the proviso that at least one of R 8 to R 13 is a propenyl group, and a is a value from 0 to 10.