Process for the manufacture of crystalline, crosslinked, elastomeric epoxide resins

Claim 1

Process for the manufacture of crystalline, crosslinked, elastomeric epoxide resins, characterised in that epoxide compounds, containing two or more epoxide groups, are reacted a. with polyester-polycarboxylic acids A which essentially contain segments of the formula I --[o--(ch.sub.2).sub.n --O.CO--(CH.sub.2).sub.m --CO].sub.p --(I) in which n and m are identical or different and denote 2 or a higher number than 2, and to which the condition n + m = 6 to 30 applies, and in which p denotes a number from 2 to 40 which, however, is sufficiently large that the segment contains at least 30 --CH 2 -- groups, and b. with polyester-polycarboxylic acids B which essentially contain segments of the formula II --[o--r.sup.1 --o.co--r.sup.2 --co].sub.q -- (II) in which R 1 denotes an alkylene radical with at least 2 C atoms in the chain, in which R 2 denotes a radical which is derived from a dimerised mono- unsaturated or di- unsaturated fatty acid, and in which, per O bridge, an average of at least 3.5 and at most 30 C atoms, without taking into account the C atoms of the --CO.O-- radicals, are present in the chain, and in which q denotes a number from 2 to 40, which, however, is sufficiently large that the segment contains at least 30 C atoms, without taking into account the C atoms of the --CO.O-- radicals, in the chain, and c. if appropriate, with curing agents C, and, if appropriate, in the presence of accelerators, in a ratio such that 0.5 to 1.2 equivalents of polyester-polycarboxylic acid are present per equivalent of epoxide compound, that 1/10 to 9/10 of these 0.5 to 1.2 equivalents are attributable to the polyester-polycarboxylic acid A and the remaining 9/10 to 1/10 to the polyester-polycarboxylic acid B, and that up to 0.6 equivalent of curing agent C is present per equivalent of epoxide compound, with the proviso that, in the cases in which only difunctional epoxide compounds and difunctional polyester-polycarboxylic acids A and B are employed, the epoxide groups must be present in excess and the reaction with a curing agent C is essential.