An epoxy resin includes an epoxy compound having a mesogenic structure, a cured product of the epoxy resin having a flexural modulus of 3.0 GPa or more at 23° C., a fracture toughness of 1.0 MPa.Math.m.sup.1/2 or more, and a glass transition temperature of 150° C. or higher.

An accelerator composition for epoxy resin formulations, the accelerator composition including (i) at least one transition metal complex and (ii) at least one salt where the cation of the salt is a metal or an onium cation with a non-nucleophilic anion; and a curable epoxy resin composition including (A) at least one epoxy thermosetting resin, (B) at least one curing agent, and (C) the above accelerator; a curable epoxy resin composition containing the above accelerator; and a cured thermoset produced from the above curable epoxy resin composition.

A curable composition includes an epoxy resin component that includes at least one multifunctional epoxy novolac resin and at least one multifunctional liquid epoxy resin, an amine hardener component that includes at least one aromatic amine and optionally at least one cycloaliphatic amine, and an accelerator component that includes (i) at least one transition metal complex having a transition metal ion and an oxygen donor ligand, and (ii) at least one salt having a cation including a metal ion or an onium ion, and an anion including a non-nucleophilic anion.

A curable composition includes an epoxy resin component that includes at least one multifunctional epoxy novolac resin and at least one multifunctional liquid epoxy resin, an amine hardener component that includes at least one aromatic amine and optionally at least one cycloaliphatic amine, and an accelerator component that includes (i) at least one transition metal complex having a transition metal ion and an oxygen donor ligand, and (ii) at least one salt having a cation including a metal ion or an onium ion, and an anion including a non-nucleophilic anion.

Provided are a thermoplastic epoxy resin composition comprising (A) an epoxy compound having two epoxy groups in one molecule, (B) a compound having two phenolic hydroxyl groups in one molecule, and at least one compound selected from the group consisting of dihexylamine, diheptylamine, di(2-ethylhexyl)amine, N-ethylhexylamine, trihexylamine, dioctylamine, tri n-octylamine, N,N-dimethyl-n-octylamine, and N,N-dimethyldecylamine as (C) a curing accelerator, and a thermoplastic cured epoxy resin with transparency to visible light produced by curing the thermoplastic epoxy resin composition.

An impregnating resin, e.g., a catalytically hardenable impregnating resin for the conductor of an electrical machine, may include at least one reactive resin mixed with at least one reactive diluent and a hardening catalyst, e.g., for cationic, anionic or coordinate polymerization of the impregnating resin. The properties of the impregnating resin or use thereof may be improved by virtue of the reactive diluent containing a heterocyclic four-membered ring. The impregnating resin may be part of a main insulation of a conductor arrangement, which may in turn be installed in an electrical coil or other electrical machine.

The present invention relates to a modifier comprising benzyl alcohol-based alkoxylates for curable compositions comprising at least one epoxy resin and a hardener, which are obtained by reacting benzyl alcohol with alkylene oxides, the benzyl alcohol-based alkoxylates having at least one ethoxy fragment.

The present invention relates to a modifier comprising benzyl alcohol-based alkoxylates for curable compositions comprising at least one epoxy resin and a hardener, which are obtained by reacting benzyl alcohol with alkylene oxides, the benzyl alcohol-based alkoxylates having at least one ethoxy fragment.

Liquid crystalline network compositions comprising azo-containing aromatic epoxy units cross-linked with alkylene diacid units having alkylene segments containing at least one methylene unit, wherein the azo-containing aromatic epoxy units and alkylene diacid units are connected by ester linkages resulting from ring-opening esterification between the epoxy units and alkylene diacids, and wherein the azo-containing aromatic epoxy units and alkylene diacid units are in a molar ratio that results in the liquid crystalline network composition exhibiting a glass transition temperature (T.sub.g) of at least 25° C. Methods for producing these compositions and their use in light- or thermal-activated physical deformation, shape memory applications, and self-healing, as well as their ability to be recycled and used in additive manufacturing processes are also described.

Curable compositions comprising an epoxy mixture comprising a) an epoxy mixture comprising i) a first epoxy component comprising epoxy phenol novolac oligomers having a content of 2-functional monomers of less than 10 weight percent based on the total weight of the first epoxy component and having an epoxide equivalent weight in the range of 170 to 200; and ii) a second epoxy component comprising an epoxy resin having monomers with an average functionality of at least 2 and b) a hardener, are disclosed. The curable compositions can be used to prepare prepregs for hot-melt applications.