Composition of butadiene/polar comonomer copolymer, aromatic reactive end group-containing prepolymer and epoxy resin

Claim 1

A composition comprising A) a liquid copolymer based on butadiene and at least one polar, ethylenically unsaturated comonomer; B) a prepolymer of formula I: ##STR13## wherein m is 1 or 2, n is 2 to 6, X is --O--, --S-- or --NR 3 --, Y is a radical selected from the group consisting of --OH, --NHR 3 , --OH reacted with a cyanogen halide to introduce --OCN, --OH reacted with an epichlorohydrin to introduce ##STR14## and --OH reacted with an epichlorohydrin to introduce an epoxide which is reacted with potassium thiocyanate or thiourea to introduce ##STR15## R 1 is a radical of a polyether, prepolymer with hydroxyl mercapto or amino end groups or of a segmented polyester, polythioester or polyamide prepolymer with hydroxyl, mercapto or amino end groups, containing at least +mol%, based on said segmented prepolymer, of polyether segments after removal of the functional end groups, R 2 is a carbocyclic aromatic or araliphatic radical of valency m+1 with groups Y bonded directly to the aromatic ring, R 3 is hydrogen, C 1 -C 6 -alkyl or phenyl and R 4 is methyl or hydrogen; C) an epoxy resin with at least two 1,2-epoxy groups per molecule; and D) an effective amount of a hardener based on an aromatic polyamine with at least two primary or secondary amino groups or an aromatic polyamine with at least two primary and secondary amino groups or an amidine.