Alkenyl-modified polyimides

Abstract From the Canadian patent

a) Polyimides of the general formula (I) (I), wherein x is an integer of at least 2 B represents a divalent, residue containing a carbon-carbon double bond and wherein A, represents an x-valent, wherein x is said integer of at least 2 and, (b) alkenylphenols or compositions of alkenylphenols selected frcm:, .alpha.-.alpha.'-bis (3-alkenyl-4-hydroxyphenyl) p-diisopropylbenzene .alpha.-.alpha.'-bis (3-alkenyl-4-hydroxyphenyl) m-diisopropylbenzene 2,2'-bis (3-alkenyl-4-hydroxyphenyl) perfluoropropane 9,9'-bis (3-alkenyl-4-hydroxyphenyl) fluorene or ethers thereof;, these curable compositions can be employed to produce resins which are both tough and thermally stable afte polymerization.