Fabrication of moulded bodies from epoxy resins by means of an automatic pressure gelling process

摘要

A process for the production of mouldings by the automatic compression gelling technique, in which a curable composition (A) containing (A1) epoxide compound(s) with more than 1 epoxide groups on average and (A2) a cationic polymerisation initiator is heated to 30-55 degrees C, placed in a mould at 80-120 degrees C (i.e. high enough for heat curing), and kept in the mould until it is cured sufficiently to be demoulded, while compensating for polymerisation shrinkage by continuous addition of composition (A) under pressure. Initiator (A2) consists of (a) sulphonium compounds of the anions PF6, AsF6, SbF6, BiF6 and derivatives thereof in which at least one fluorine atom is replaced by a hydroxyl group, or of the CF3SO3 anion, such compounds containing at least 1-12C alkyl, 3-8C cycloalkyl, 4-10C (cycloalkyl)alkyl or 7-15C aralkyl group attached to the sulphur atom, and/or (b) compounds of formula ÄM(power+n)(L)xÜ(power)n+ nX- (I), in which n = 2 or 3; M = a divalent cation of Zn, Mg, Fe, Co, Ni, Cr, Ru, Mn, Sn, VO, or a trivalent cation of Fe, Al or Co; X- = fluorine-containing anion as above, optionally with up to 50% of any other anion; L = water or organic sigma -donor ligand(s) containing one or more functional groups selected from -CO-, -COO-, -OCOO- or -O- as ligand sites and forming sigma bonds with the central atom via the oxygen atom(s); x = 0-6.