Abstract: Aluminium monohydroxide salts of a carboxylic acid which are free from water of crystallization and have the formula ##STR1## or contain the structural element of the formula ##STR2## in which R is methyl, ethyl or phenyl or R.sup.1 is the divalent group --C.sub.n H.sub.2n --, in which n is a number from 3 to 10, and which can also be in the form of a dimer, have an acicular to rod-shaped crystal form. They are suitable as fillers for polymers, especially as reinforcing fillers for elastomeric epoxide resins.

Abstract: Adducts containing epoxide groups, which have been (so-called) "advanced" with polyesters containing rings are obtained by reacting adducts containing epoxide groups, which have been obtained by reaction of certain long-chain aliphatic polyesters with diepoxide compounds in excess, with polyesterdicarboxylic acids, containing carbocyclic or heterocyclic rings, while heating, 0.3 - 0.5 carboxyl group equivalent of the polyester-dicarboxylic acid containing rings being employed per 1 epoxide equivalent of the adduct containing epoxide groups. Curing of the (so-called) "advanced" adducts containing epoxide groups gives flexible moulded materials which are distinguished, in particular, by high tear propagation resistance.

Abstract: Curable epoxide resin mixtures based on long-chain adducts containing epoxide groups, which are obtained by reaction of certain long-chain aliphatic polyesters with an excess of diepoxide compounds, polycarboxylic acid anhydrides and linear polyester-dicarboxylic acids containing carbocyclic or heterocyclic rings, which mixtures contain, per 1 equivalent of epoxide groups, 0.2-0.8 mol of polycarboxylic acid anhydride and 0.8-0.2 equivalent of carboxyl groups of the polyester-dicarboxylic acid. Curing of these epoxide resin mixtures gives flexible moulding materials which are distinguished by high tear propagation resistance.

Abstract: New diglycidyl compounds of mononuclear, five-membered or six-membered, unsubstituted or substituted, hydroxyalkylated N-heterocyclic compounds, produced by addition of formaldehyde or acetaldehyde to mononuclear, five-membered or six-membered, unsubstituted or substituted, N-heterocyclic compounds, for example hydantoin or dihydrouracil, to monohydroxyalkyl compounds, and subsequent glycidylation of the OH group and NH group to give the corresponding glycidyl compounds.

Abstract: Curable epoxide resin mixtures based on adducts, containing epoxide groups, which are obtained by reaction of certain long-chain aliphatic polyesters with an excess of diepoxide compounds, and linear or slightly branched polyesters, containing carbocyclic or heterocyclic rings and possessing 3 or 4 terminal carboxyl groups, and having an average molecular weight of 600 - 6,000, 0.7 - 1.2 equivalents of carboxyl groups being present in the curable mixture per 1 equivalent of epoxide groups. Curing these epoxide resin mixtures gives flexible moulded materials which are distinguished by high tear propagation resistance.