Process for the manufacture of crystalline, crosslinked epoxide resins

Claim 1

Process for the manufacture of crystalline, crosslinked epoxide resins having at least two different crystallite melting points, characterized in that epoxide compounds, containing two or more epoxide groups, are reacted (a) with polyester-polycarboxylic acids D which consists essentially of 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 E which is different from the polyester-polycarboxylic acid D which consists essentially of segments of the formula II --[O--(CH.sub.2).sub.s --O.CO--(CH.sub.2).sub.r --CO].sub.q --tm (II) in which s and r are identical or different and denote 2 or a higher number than 2, and to which the condition s+r+2≦n+m applies, and in which q denotes a number from 6 to 30, which, however, is sufficiently large that the segment contains at least 30 --CH 2 --groups, 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 D and the remaining 9/10 to 1/10 to the polyester-polycarboxylic acid E, 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 D and E are employed, the epoxide groups must be present in excess and the reaction with a curing agent C is essential.