Cathodic electrocoating compositions and methods for coating electrically conductive substrates are provided. An exemplary cathodic electrocoating composition includes an aqueous carrier and a film forming binder dispersed in the carrier. Further, the cathodic electrocoating composition includes chitosan as an edge protective agent.

Disclosed herein are compositions including (a) a first component comprising (1) an epoxy-adduct that is the reaction product of reactants comprising a first epoxy compound, a polyol, and an anhydride and/or a diacid and (2) a second epoxy compound; (b) rubber particles having a core/shell structure and/or graphenic carbon particles; and (c) a second component that chemically reacts with the first component at ambient or slightly thermal conditions. Also disclosed herein are compositions including (a) an epoxy-capped flexibilizer; (b) a heat-activated latent curing agent; and optionally (c) rubber particles having a core/shell structure and/or graphenic carbon particles; (d) an epoxy/CTBN adduct; and/or (e) an epoxy/dimer acid adduct. The heat-activated latent curing agent may include at least one reaction product of reactants including an epoxy compound and an amine and/or an alkaloid.

The present invention relates to a fire protection composition comprising a component A and a component B. Component A comprises an epoxy liquid resin and ammonium polyphosphate. Component B comprises an adduct B1 of (i) at least one polyamine having at least three amine hydrogens reactive toward epoxide groups with (ii) at least one epoxide, an ether group-containing aliphatic primary diamine B2, and an aliphatic or cycloaliphatic primary diamine B3. The fire protection composition has good adhesion to metal, and after passing through burning-in ovens in the automotive industry still shows good fire protection values with a low mass loss and is suitable for spray application.

Disclosed herein is an epoxy-amine adduct comprising a reaction product of a heterocyclic amine comprising a reaction product of a polyethylene polyamine having 3 to 10 nitrogen atoms and an aldehyde having 1 to 8 carbon atoms; and at least one epoxide having one or more epoxy groups, wherein the heterocyclic amine has at least two nitrogen atoms in at least one ring, and the epoxide is essentially free of polyether modification. A curing agent comprising the epoxy-amine adduct and a method for preparing the epoxy-amine adduct are provided.

The invention relates to a method for preparing an epoxy prepolymer composition comprising glycidyl ethers, said method comprising the following steps: a) placing a dianhydrohexitol into contact with another alcohol so as to obtain a composition of alcohols; b) reacting the composition of alcohols obtained in step a) with an epihalohydrin so as to obtain a reaction mixture comprising glycidyl ethers; c) recovering the epoxy prepolymer composition comprising glycidyl ethers from the reaction mixture obtained at the end of step b);
The invention also relates to an epoxy prepolymer composition that can be obtained by said method, a curable composition comprising said epoxy prepolymer composition, a polyepoxide obtained by curing said curable composition and a composite material, coating or adhesive comprising said polyepoxide.

A curing agent composition and a curing agent coating formula thereof are provided. The curing agent composition includes 5 to 25 wt % of an ester group-containing amine end group adduct, 2 to 25 wt % of a C8-C22 hydrophobic saturated or unsaturated fatty amine, 2 to 25 wt % of a polyamine compound, 2 to 20 wt % of a silane compound, and 10 to 60 wt % of an ether solvent.

An epoxy resin composition and a cured product thereof are provided, the epoxy resin composition comprising an epoxy resin (A), a curing agent (B) comprising a compound represented by the following formula (B-1) (wherein R.sup.1 represents a hydrogen atom, a halogen atom, a methoxy group or a hydrocarbon group having 1 to 12 carbon atoms), and an imidazole adduct-type curing accelerator (C), wherein the molar ratio of the content of a phenolic hydroxide group to the content of an epoxy group in the epoxy resin composition is 0.25 to 0.67.

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Provided is a fiber-reinforced composite material exhibiting high heat resistance and excellent appearance quality. is the composite material is based on an epoxy resin composition which contains constituents [A], [B], and [C] and satisfies conditions (i) and (ii): [A] a tri- or higher functional epoxy resin; [B] an aromatic amine; [C] an imidazole compound;
0.20≤b/a≤0.60; and  (i)
0.002≤c/a≤0.014;  (ii)
wherein a (mol) denotes the number of epoxy groups in 100 g of the epoxy resin composition, b (mol) denotes the number of active hydrogens contained in the constituent [B], and c (mol) denotes the number of imidazole rings contained in the constituent [C]).

An epoxy resin B-stage film obtained by semi-curing an epoxy resin composition, the epoxy resin composition including: a liquid crystalline epoxy monomer capable of forming a cured product that includes a liquid crystal structure; and a curing agent, in which the epoxy resin B-stage film has an average thickness of less than 8 μm, and in which the liquid crystal structure included in the cured product turns into a liquid crystal structure, in which molecules are orientated in a film thickness direction, by being cured.

A process for preparing a curing agent for epoxy resins, in which an amine mixture including at least one parent amine of the formula (I) and at least one alkylated amine of the formula (II) is reacted or adducted with at least one glycidyl ether of the formula (III). The amine mixture is especially a reaction mixture from the partial alkylation of the amine of the formula (I). The process described enables, with low energy expenditure and high space-time yield, curing agents of low odor, low toxicity, low viscosity and high reactivity for epoxy resins and epoxy resin products that cure rapidly at ambient temperatures and especially also under cold conditions and at the same time enable high-quality coatings having an even, shiny surface.