Abstract: A method for making a di(aminoaryl)fluorene compound that includes the steps of: (a) reacting a fluorenone compound according structure (I): with excess aminobenzene according to structure (II): wherein: each R1, R2, R3, R4, R12, and R13 is independently a group that is inert in the polymerization of epoxy compounds, and R11 is H or (C1-C6)alkyl, in the presence of an acid catalyst, in a liquid medium comprising an aromatic or substituted aromatic solvent having a boiling point of greater than or equal to 150° C. and from which the di(aminoaryl)fluorene compound is crystallizable, to form a crude product mixture comprising the di(aminoaryl)fluorene compound, (b) crystallizing di(aminoaryl)fluorene compound in the product mixture, and (c) separating the product mixture into crystallized di(aminoaryl)fluorene compound and a filtrate.

Abstract: The present invention is directed to a method for making a di(aminoaryl)fluorene compound that includes the steps of: (a) reacting a fluorenone compound according structure (I) with excess aminobenzene according to structure (II) wherein: each R1, R2, R3, R4, R12, and R13 is independently a group that is inert in the polymerization of epoxy compounds, and R11 is H or (C1-C6)alkyl, in the presence of an acid catalyst, in a liquid medium comprising an aromatic or substituted aromatic solvent having a boiling point of greater than or equal to 150° C. and in the presence of an acid catalyst, in a liquid medium comprising an aromatic or substituted aromatic solvent having a boiling point of greater than or equal to 150° C.

Abstract: The present invention is directed to a method for making a di(aminoaryl)fluorene compound that includes the steps of: (a) reacting a fluorenone compound according structure (I) with excess aminobenzene according to structure (II) wherein: each R1, R2, R3, R4, R12, and R13 is independently a group that is inert in the polymerization each R1, of epoxy compounds, and R11 is H or (C1-C6)alkyl, in the presence of an acid catalyst, in a liquid medium comprising an aromatic or substituted aromatic solvent having a boiling point of greater than or equal to 150° C. and in the presence of an acid catalyst, in a liquid medium comprising an aromatic or substituted aromatic solvent having a boiling point of greater than or equal to 150° C.

Abstract: A curing agent composition contains at least one multifunctional aromatic amine that forms a crystalline solid at 25° C., and at least one halo-substituted diethyltoluenediamine, in an amount effective to inhibit crystallization of the at least one multifunctional aromatic amine. A curable resin composition contains at least one epoxy compound having at least two epoxide groups per molecule of the epoxy compound and the curing agent composition. Methods for inhibiting phase separation of a curing agent composition or curable resin composition that contains at least one multifunctional aromatic amine that forms a crystalline solid at 25° C. include a step of adding to the respective composition at least one halo-substituted diethyltoluenediamine in an amount effective to inhibit crystallization of the at least one multifunctional aromatic amine. The compositions and methods are useful in making fiber reinforced resin matrix composite articles.

Abstract: Curable epoxy resin compositions suitable for liquid resin infusion processes. In one embodiment, the resin composition contains (a) at least two polyepoxides, one of which is triglycidyl ether of tris(hydroxyphenyl)methane, (b) an aromatic amine curing agent, and (c) core-shell rubber particles. In another embodiment, the resin composition (a) at least two polyepoxides, one of which is diglycidyl ether of bis(hydroxyphenyl)fluorene, (b) an aromatic amine curing agent, and (c) core-shell rubber particles.

Abstract: Curable epoxy resin compositions suitable for liquid resin infusion processes. In one embodiment, the resin composition contains (a) at least two polyepoxides, one of which is triglycidyl ether of tris(hydroxyphenyl)methane, (b) an aromatic amine curing agent, and (c) core-shell rubber particles. In another embodiment, the resin composition (a) at least two polyepoxides, one of which is diglycidyl ether of bis(hydroxyphenyl)fluorene, (b) an aromatic amine curing agent, and (c) core-shell rubber particles.

Abstract: A resin infusion method that includes: (a) heating a mixture of solid amine compounds until all amine compounds are melted; (b) cooling the mixture of melted amine compounds to a temperature of 35° C. or lower to form an amine blend (A); (c) combining the amine blend (A) with a thermosettable resin (B), which includess one or more epoxy monomers, at a temperature effective for forming a liquid resin composition; and (d) infusing a fibrous preform with the liquid resin composition.

Abstract: A curable composition for liquid resin infusion (LRI) and a manufacturing process for producing a molded article. The curable composition includes: a) no more than 5.0 wt % of a thermoplastic polymer; b) no more than 5.0 wt % of nano-sized core-shell particles; c) no more than 5.0 wt % of nano-sized inorganic particles; d) an epoxy resin component; and e) one or more amine curing agent(s), wherein the initial viscosity of said curable composition is no more than 5 Poise at a temperature within the temperature range of from about 80° C. to about 130° C.

Abstract: A curable composition for liquid resin infusion (LRI) and a manufacturing process for producing a molded article. The curable composition includes: a) no more than 5.0 wt % of a thermoplastic polymer; b) no more than 5.0 wt % of nano-sized core-shell particles; c) no more than 5.0 wt % of nano-sized inorganic particles; d) an epoxy resin component; and e) one or more amine curing agent(s), wherein the initial viscosity of said curable composition is no more than 5 Poise at a temperature within the temperature range of from about 80° C. to about 130° C.

Abstract: Curable epoxy resin compositions suitable for liquid resin infusion processes. In one embodiment, the resin composition contains (a) at least two polyepoxides, one of which is triglycidyl ether of tris(hydroxyphenyl)methane, (b) an aromatic amine curing agent, and (c) core-shell rubber particles. In another embodiment, the resin composition (a) at least two polyepoxides, one of which is diglycidyl ether of bis(hydroxyphenyl)fluorene, (b) an aromatic amine curing agent, and (c) core-shell rubber particles.

Abstract: A curable composition for liquid resin infusion (LRI) and a manufacturing process for producing a molded article. The curable composition includes: a) no more than 5.0 wt % of a thermoplastic polymer; b) no more than 5.0 wt % of nano-sized core-shell particles; c) no more than 5.0 wt % of nano-sized inorganic particles; d) an epoxy resin component; and e) one or more amine curing agent(s), wherein the initial viscosity of said curable composition is no more than 5 Poise at a temperature within the temperature range of from about 80° C. to about 130° C.

Abstract: A method for producing a modified form of an aromatic amine compound represented by the following structure I: where A is an amine group —NHR, R is independently selected from hydrogen, linear and branched alkyl groups having 1 to 6 carbon atoms, preferably A is NH2; X is a halogen selected from Cl, Br, F, I, and At, or hydrogen (H). The method includes heating the aromatic amine compound, in its initial crystalline form, to a temperature above its melting point in order to obtain a molten material, then cooling the molten material to a temperature below the melting point of the crystalline compound so as to produce an amorphous, glassy form of the aromatic amine compound. The modified aromatic amine compound is suitable as a curing agent in resin compositions that are used for fabricating fiber-reinforced composites.

Abstract: A method for producing a modified form of an aromatic amine compound represented by the following structure I: where A is an amine group —NHR, R is independently selected from hydrogen, linear and branched alkyl groups having 1 to 6 carbon atoms, preferably A is NH2; X is a halogen selected from Cl, Br, F, I, and At, or hydrogen (H). The method includes heating the aromatic amine compound, in its initial crystalline form, to a temperature above its melting point in order to obtain a molten material, then cooling the molten material to a temperature below the melting point of the crystalline compound so as to produce an amorphous, glassy form of the aromatic amine compound. The modified aromatic amine compound is suitable as a curing agent in resin compositions that are used for fabricating fiber-reinforced composites.

Abstract: A method for producing a modified form of an aromatic amine compound represented by the following structure I: where A is an amine group —NHR, R is independently selected from hydrogen, linear and branched alkyl groups having 1 to 6 carbon atoms, preferably A is NH2; X is a halogen selected from Cl, Br, F, I, and At, or hydrogen (H). The method includes heating the aromatic amine compound, in its initial crystalline form, to a temperature above its melting point in order to obtain a molten material, then cooling the molten material to a temperature below the melting point of the crystalline compound so as to produce an amorphous, glassy form of the aromatic amine compound. The modified aromatic amine compound is suitable as a curing agent in resin compositions that are used for fabricating fiber-reinforced composites.

Abstract: A curable composition for liquid resin infusion (LRI) and a manufacturing process for producing a molded article. The curable composition includes: a) no more than 5.0 wt % of a thermoplastic polymer; b) no more than 5.0 wt % of nano-sized core-shell particles; c) no more than 5.0 wt % of nano-sized inorganic particles; d) an epoxy resin component; and e) one or more amine curing agent(s), wherein the initial viscosity of said curable composition is no more than 5 Poise at a temperature within the temperature range of from about 80? C. to about 130? C.

Abstract: A method for producing a modified form of an aromatic amine compound represented by the following structure I: where A is an amine group —NHR, R is independently selected from hydrogen, linear and branched alkyl groups having 1 to 6 carbon atoms, preferably A is NH2; X is a halogen selected from Cl, Br, F, I, and At, or hydrogen (H). The method includes heating the aromatic amine compound, in its initial crystalline form, to a temperature above its melting point in order to obtain a molten material, then cooling the molten material to a temperature below the melting point of the crystalline compound so as to produce an amorphous, glassy form of the aromatic amine compound. The modified aromatic amine compound is suitable as a curing agent in resin compositions that are used for fabricating fiber-reinforced composites.

Abstract: Disclosed herein is a method for utilizing the exothermic energy generated by a low temperature cure reaction to access a high-temperature cure reaction, which is otherwise energetically inaccessible at a chosen tool temperature, thereby producing a cured resin matrix with properties closely matching to those produced via high-temperature cure reactions but achieved via a short cure time and low cure temperature. Also disclosed is a short-cure resin composition containing: (a) at least one multifunctional epoxy resin having an epoxy functionality of greater than 1; (b) a hardener composition containing (i) at least one aliphatic or cycloaliphatic amine curing agent having one or more amino groups per molecule; (ii) at least one aromatic amine curing agent having one or more amino groups per molecule; and optionally, (iii) an imidazole as curing accelerator. The improved properties of this resin composition include being curable at a temperature of ?120° C.

Abstract: Disclosed herein is a method for utilizing the exothermic energy generated by a low temperature cure reaction to access a high-temperature cure reaction, which is otherwise energetically inaccessible at a chosen tool temperature, thereby producing a cured resin matrix with properties closely matching to those produced via high-temperature cure reactions but achieved via a short cure time and low cure temperature. Also disclosed is a short-cure resin composition containing: (a) at least one multifunctional epoxy resin having an epoxy functionality of greater than 1; (b) a hardener composition containing (i) at least one aliphatic or cycloaliphatic amine curing agent having one or more amino groups per molecule; (ii) at least one aromatic amine curing agent having one or more amino groups per molecule; and optionally, (iii) an imidazole as curing accelerator. The improved properties of this resin composition include being curable at a temperature of ?120° C.

Abstract: Disclosed herein is a method for utilizing the exothermic energy generated by a low temperature cure reaction to access a high-temperature cure reaction, which is otherwise energetically inaccessible at a chosen tool temperature, thereby producing a cured resin matrix with properties closely matching to those produced via high-temperature cure reactions but achieved via a short cure time and low cure temperature. Also disclosed is a short-cure resin composition containing: (a) at least one multifunctional epoxy resin having an epoxy functionality of greater than 1; (b) a hardener composition containing (i) at least one aliphatic or cycloaliphatic amine curing agent having one or more amino groups per molecule; (ii) at least one aromatic amine curing agent having one or more amino groups per molecule; and optionally, (iii) an imidazole as curing accelerator. The improved properties of this resin composition include being curable at a temperature of ?120° C.