Epoxy resin crosslinked with polyamine and chlorosulfonated polyolefin

A process for preparing a crosslinked epoxy resin composition which comprises, at ambient temperature in the absence of a bicyclic amidine:

• 1) preparing a derivative by reacting:
• a) 5-80% by weight, based on the total weight of the composition, of a chlorosulfonated olefin polymer having a chlorine content of about 20-60% by weight and a sulfur content of about 0.5-10% by weight;
• with
• b) 0.1-1 1 equivalent, per equivalent of sulfur present in the chlorosulfonated olefin polymer, of a compound selected from the group consisting of primary and secondary monoamines, monohydric alcohols, and mixtures thereof;
• and
• 2) further reacting the resultant derivative with:
• c) 5-90% by weight, based on the total weight of the composition, of a polyamide having at least two terminal amine groups per molecule, or a polyamine other than said polyamide, wherein the equivalent ratio of the polyamide having at least two terminal amine groups per molecule, or a polyamine other than said polyamide to sulfur in the chlorosulfonated olefin polymer is greater than 1:1 and the polyamide having at least two terminal amine groups per molecule, or a polyamine other than said polyamide has an equivalent weight up to 5,000;
• and with
• d) at least 5% by weight, based on the total weight of the composition, of an epoxy resin prepolymer;
• and with
• e) optionally, 0.1-2 equivalents, per equivalent of sulfur present in the chlorosulfonated olefin polymer, of a tertiary amine;
• wherein the epoxy resin is crosslinked with the chlorosulfonated olefin polymer via sulfonamide groups.