ES447355A1 - Process for the manufacture of crystalline crosslinked epoxide resins - Google Patents

Abstract

Process for the preparation of crystalline and crosslinked epoxy resins, characterized by reacting two or more epoxy compounds carrying epoxy groups a) with polyesterpolycarboxylic acids D containing essentially segments of formula I - [O-CH2) n-O.CO- (CH2) m-CO -] - P, (I) in which n and m are the same or different and mean 2 or a number greater than 2 and the condition that n + m = 6 to 30 applies to them, and p means a number worth 2 to 40, but so large that the segment contains at least 30 -CH2 groups, and b) with polyester polycarboxylic acids E containing essentially segments of formula II - [0- (CH2) 2-0.CO- (CH2) r-CO] - (II) in which s and r are the same or different and signify 2 or a number greater than 2, and the condition that s + r = 2 <= n + m, and q means a number valued from 6 to 30, but so large that the segment contains at least 30 -CH2 groups, and c) optionally, with hardeners c, optionally in the presence of accelerators, in such a quantitative relationship that for 1 equivalent of epoxide compound, 0.5 to 1.2 equivalents of polyester polycarboxylic acid enter, that 1/10 to 9/10 of these 0.5 to 1.2 equivalents correspond to polyester polycarboxylic acid D and the rest, 9/10 to 1/10, correspond to polyester carboxylic acid E, and that for 1 equivalent of epoxide compound enter up to 0.6 equivalents of hardener C, with the proviso that in cases where only difunctional epoxy compounds and difunctional polyesterpolycarboxylic acids D and E are used, the epoxide groups must be in excess and reaction with a hardener C is necessary. (Machine-translation by Google Translate, not legally binding)