The present disclosure provides a curable composition that includes an epoxy resin and a curing component comprising a blend of at least two amines. The curable composition may be combined with reinforced fibers and cured to form a composite article which can be used in various applications, such as in wind turbine blades.

Disclosed is a curable composition capable of producing a cured product having excellent heat resistance and low outgassing properties. In particular, the curable composition comprises an epoxy compound represented by formula (1):

##STR00001##

wherein R.sup.1 to R.sup.4, R.sup.7 to R.sup.12, and R.sup.15 to R.sup.18 are each independently selected from the group consisting of hydrogen, an alkyl group, and an alkoxy group; R.sup.5, R.sup.6, R.sup.13, and R.sup.14 are each independently selected from the group consisting of hydrogen, an alkyl group, and an alkoxy group; with the optional exception that one of R.sup.5 or R.sup.6 and one of R.sup.13 or R.sup.14 forms a cross-linked structure represented by —CH.sub.2—, and n is an integer of 0 or 1, and a cationic polymerization initiator containing a Lewis acid and a Lewis base.

The present invention relates to a low-alkylphenol composition comprising a) at least one epoxy resin, b) at least one amine having at least two secondary amino groups that are both part of an organic ring system, and c) at least one salt of a strong Brønsted acid with a counterion selected from metal ions, metal-containing ions, phosphonium ions and ammonium ions, to processes for production thereof and to the use thereof.

The present invention relates to a composition comprising a) at least one epoxy resin, b) at least one amine having at least two secondary amino groups which are both part of an organic ring system, and c) at least one salt of a very strong Brønsted acid with a counterion selected from metal ions, metal-containing ions, phosphonium ions and ammonium ions, and to processes for production thereof and use thereof.

An electromagnetic steel sheet coated with an insulating film with excellent hardness and suitable for use as a material for iron cores of large-sized electric-power generators; and a process for producing the electromagnetic steel sheet coated with an insulating film. The purpose is achieved with a coating material for forming insulating films, the coating material including a solvent and components (A) to (C) contained therein in the respective amounts on a solid basis. (A) A water-compatible carboxylated resin; 100 parts by mass. (B) An aluminum-containing oxide; more than 40 parts by mass but less than 300 parts by mass per 100 parts by mass of the component (A). (C) At least one crosslinking agent selected from the group containing of melamine, isocyanates, and oxazoline; 100 parts by mass or more but less than 300 parts by mass per 100 parts by mass of the component (A).

The present invention provides a composition comprising a) at least one epoxy resin, b) at least one cyclic amine of the formula (I) ##STR00001##
in which R.sup.1 to R.sup.4 is H or an organic radical, with the proviso that at least one of the R.sup.1, R.sup.2, R.sup.3 and R.sup.4 radicals ═H, and
X═—(Y.sup.1).sub.m-(A.sup.1).sub.n-(Y.sup.2).sub.o-(A.sup.2).sub.p-(Y.sup.3).sub.q-(A.sup.3).sub.r-(Y.sup.4).sub.s—  (II) where, independently of one another, m, n, o, p, q, r and s=0 or 1, A.sup.1, A.sup.2, A.sup.3=alkylene or alkenylene radical and Y.sup.1, Y.sup.2, Y.sup.3, Y.sup.4═NR.sup.5, PR.sup.5, O or S, where R.sup.5 independently=organic radical, where any two organic radicals selected from R.sup.1 to R.sup.5 and any radicals present in the alkylene and/or alkenylene radicals A.sup.1, A.sup.2, A.sup.3 may also form one or more further rings, with the proviso that at least one of the radicals selected from R.sup.1 to R.sup.5 present and any radicals present in the alkylene and/or alkenylene radicals A.sup.1, A.sup.2, A.sup.3 is substituted by at least one —NHR.sup.6 or —NH.sub.2 group, where R.sup.6=organic radical, and
c) at least one salt of a strong Brønsted acid with a counterion selected from metal ions, metal-containing ions, phosphonium ions and unsubstituted ammonium ions,
where the ratio of the epoxy groups in the epoxy resin to the sum total of all NH groups in all amines is 0.5:1 to 1.5:1,
and to processes for production thereof and use thereof.

The present invention aims to provide a resin composition which can form a cured product having a high adhesive property and a high thermal conductivity. A resin composition containing an epoxy compound (A), an amine curing agent (B) and a thermally conductive filler (C), wherein the epoxy compound (A) is in a liquid form and wherein the amine curing agent (B) contains a benzoxazole skeleton.

A curable resin composition including components (A), (B), (C) and (D) below: component (A): a bisphenol epoxy resin with a softening point of 80° C. or more, component (B): a bisphenol epoxy resin which is liquid at 25° C., component (C): a bi- or more-functional (meth)acrylate compound, and component (D): a curing agent.

The present disclosure provides a curing agent comprising a polyetheramine, a tertiary amine substantially free of an aromatic tertiary amine and glycerin. The curing agent may be combined with an epoxy resin to form a curable composition which is capable of being applied to a substrate and cured to form a cured article.

A photobase generator includes a compound including a first skeleton represented by the following formula (a), and a second skeleton including a nitrogen atom bonding to a bonding position of the first skeleton to form an amide group, wherein the compound generates a base, in which a hydrogen atom is bonding with the nitrogen atom of the second skeleton, by light irradiation, and the pKa of a conjugate acid of the base in water is 12 or more. In formula (a), G is a divalent aromatic group, and * represents the bonding position with the nitrogen atom.

##STR00001##