The present invention provides: a two-pack curable epoxy resin composition that contains a curing agent having excellent long-term storage stability, has a low viscosity and a good impregnation property into fibers; the cured product; a fiber-reinforced composite material; and a molded article. Specifically, the two-pack curable epoxy resin composition is used, the two-pack curable epoxy resin composition containing: a main agent (i) containing an epoxy resin (A); and a curing agent (ii) containing an acid anhydride (B) and an organic phosphorus compound (C), in which a mass ratio [(i)/(ii)] of the main agent (i) to the curing agent (ii) is in a range of 35/65 to 75/25, and an amount of the organic phosphorus compound (C) used is in a range of 0.5 to 5 parts by mass with respect to 100 parts by mass in total of the epoxy resin (A) and the acid anhydride (B).

A composition for forming a thermally conductive material contains a compound represented by General Formula (1), a phenolic compound, and an inorganic substance, in which a content of the compound represented by General Formula (1) is 30.0% by mass or greater with respect to a total organic solid content,

(X—Z.sup.1—).sub.m-A-(—Z.sup.2—Y).sub.n  (1).

Phosphorous containing compounds, epoxy resins thereof, and laminate composite structures thereof. The phosphorus containing compounds may have a structure according to formula (I):

##STR00001##

wherein, X is an aromatic hydrocarbon group having 6 to 30 carbon atoms or a bivalent linear or branched alkylene group of 1 to 8 carbon atoms; R.sup.A is selected from an alkyl group having 1 to 6 carbon atoms, a phenyl group, a napthyl group, and an aromatic phenol group; w is an integer of 1 to 9; R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are independently selected from H, C.sub.1-C.sub.10 alkyl, C.sub.1-C.sub.10 alkoxy, and C.sub.3-C.sub.10 cycloalkyl; R.sub.5 is selected from the group consisting of C.sub.1-C.sub.10 alkyl, C.sub.1-C.sub.10 alkoxy, C.sub.3-C.sub.10 cycloalkyl, and Ar.sub.3; and Ar.sub.1 and Ar.sub.2 are independently selected.

Phosphorous containing compounds, epoxy resins thereof, and laminate composite structures thereof. The phosphorus containing compounds may have a structure according to formula (I): ##STR00001##
wherein, X is an aromatic hydrocarbon group having 6 to 30 carbon atoms or a bivalent linear or branched alkylene group of 1 to 8 carbon atoms; R.sup.A is selected from an alkyl group having 1 to 6 carbon atoms, a phenyl group, a napthyl group, and an aromatic phenol group; w is an integer of 1 to 9; R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are independently selected from H, C.sub.1-C.sub.10 alkyl, C.sub.1-C.sub.10 alkoxy, and C.sub.3-C.sub.10 cycloalkyl; R.sub.5 is selected from the group consisting of C.sub.1-C.sub.10 alkyl, C.sub.1-C.sub.10 alkoxy, C.sub.3-C.sub.10 cycloalkyl, and Ar.sub.3; and Ar.sub.1 and Ar.sub.2 are independently selected.

Compositions and methods for forming epoxy resin systems are provided. In one embodiment, a composition is provided for an epoxy resin system including an epoxy resin blend comprising an epoxy resin, a first curing agent selected from the group of a polyarylene alkylphosphonate, a polyarylene arylphosphonate, and combinations thereof, and a second curing agent.

The purpose of the present invention is to provide an epoxy resin composition which has excellent viscosity stability, and when cured, can provide a resin cured product which has high flame retardancy and excellent mechanical properties, and a prepreg and fiber-reinforced composite material using the epoxy resin composition. An embodiment of the epoxy resin composition according to the present invention which achieves the purpose contains all components [A]-[C]. [A]: A reactive diluent having a specific structure and a viscosity of 2 Pa.Math.s or less at 25° C. [B]: An epoxy resin having three of more functional groups. [C]: An amine-based curing agent having a specific structure.

A two-part system comprising a first component including one or more epoxy resins or epoxy-functionalized resins and a second component including one or more phosphate esters, wherein the first component and second component are liquid at room temp and upon mixing the first component with the second component at room temperature, a composition is formed that is solid.

The invention relates to a cationically curable composition with at least one cationically polymerizable component, a first photoinitiator releasing an acid when irradiated with actinic radiation of a first wavelength λ.sub.1, and a second photoinitiator releasing an acid when irradiated with actinic radiation of a second wavelength λ.sub.2, wherein the second wavelength λ.sub.2 is shorter than the first wavelength λ.sub.1, and wherein the second photoinitiator, after irradiation of the composition with actinic radiation of the first wavelength λ.sub.1, shows an absorption of actinic radiation of the second wavelength λ.sub.2 in the composition that is sufficient to activate the second photoinitiator and fix the composition. Furthermore, a method is described for the joining, casting, molding, sealing and/or coating of substrates using the cationically curable composition.

The invention relates to a curable two- or multi-part composition with (a) optionally an at least bifunctional epoxy-containing compound; (b) an at least bifunctional nitrogen-based curing agent suitable for epoxy curing; (c) a radiation-curable hybrid compound having both one or more radiation-curable methacrylate groups and one or more epoxy groups; (d) a radical photoinitiator; (e) optionally an accelerator for epoxy curing, and (f) optionally further additives. In addition, the invention relates to a method for the bonding, casting, molding or coating of substrates using the composition.

Disclosed are a fluorine-silicon-containing polyphosphate ester and method for preparation thereof, having a chemical structural formula of: ##STR00001##
wherein R.sub.1 is ##STR00002##
R.sub.2 is ##STR00003##
n=10˜100. The fluorine-silicon-containing polyphosphate ester of the present invention uses silicon phosphorus and fluorine for improving flame retardancy. Phosphorus catalyzes the system to form a phosphorus-rich carbon layer, performing a protective-layer function and thereby preventing further breakdown of the epoxy resin. The silicon-containing epoxy resin forms a silica-containing carbon layer during the process of combustion, strengthening the carbon-layer structure and further improving the protective function of the carbon-layer. The introduction of elemental fluorine improves the thermal stability of the epoxy resin, thereby improving the flame retardancy performance of the system.