A curable epoxy composition, comprising: 100 parts by weight of an epoxy resin composition comprising one or more epoxy resins, each independently having an epoxy equivalent weight of at least 2; 30 to 200 parts by weight of an aromatic dianhydride curing agent of formula (1)

##STR00001##

wherein T is O, S, C(O), SO.sub.2, SO, C.sub.yH.sub.2y wherein y is an integer from 1 to 5 or a halogenated derivative thereof, or OZO wherein Z is an aromatic C.sub.6-24 monocyclic or polycyclic moiety optionally substituted with 1 to 6 C.sub.1-8 alkyl groups, 1 to 8 halogen atoms, or a combination comprising at least one of the foregoing, wherein the composition does not contain a catalyst.

A thermoplastic polyester resin composition includes 0.05 to 10 parts by weight of an epoxy compound (B) and 0.001 to 1 part by weight of a hindered amine compound (C) with respect to 100 parts by weight of a thermoplastic polyester resin (A) having an amount of carboxyl groups of 50 eq/t or less. The thermoplastic polyester resin composition is capable of producing a molded article which is excellent in mechanical properties and heat resistance, as well as in long-term hydrolysis resistance, and has a small decrease in mechanical properties and hydrolysis resistance even when melt-processed at a high temperature of 270 C. or more.

A thermoplastic polyester resin composition includes 0.05 to 10 parts by weight of an epoxy compound (B) and 0.001 to 1 part by weight of a hindered amine compound (C) with respect to 100 parts by weight of a thermoplastic polyester resin (A) having an amount of carboxyl groups of 50 eq/t or less. The thermoplastic polyester resin composition is capable of producing a molded article which is excellent in mechanical properties and heat resistance, as well as in long-term hydrolysis resistance, and has a small decrease in mechanical properties and hydrolysis resistance even when melt-processed at a high temperature of 270 C. or more.

A thermoset resin composition and composite materials containing reinforcement fibers impregnated with the thermoset resin composition. The thermoset resin composition contains: (a) a combination of multifunctional epoxy resins; (b) 4,4-meth-ylenebis(2,6-xylidine) as a curative for the epoxy resins; and (c) a thermoplastic component, wherein the thermoset resin composition is void of any catalyst or accelerator that is reactive with the epoxy resins.

A thermoset resin composition and composite materials containing reinforcement fibers impregnated with the thermoset resin composition. The thermoset resin composition contains: (a) a combination of multifunctional epoxy resins; (b) 4,4-meth-ylenebis(2,6-xylidine) as a curative for the epoxy resins; and (c) a thermoplastic component, wherein the thermoset resin composition is void of any catalyst or accelerator that is reactive with the epoxy resins.

Disclosed are powder coating compositions that include a polymeric aromatic product of an aromatic isocyanate manufacturing process.

Disclosed are powder coating compositions that include a polymeric aromatic product of an aromatic isocyanate manufacturing process.

A curable epoxy composition comprises 100 parts by weight of an epoxy resin composition comprising one or more epoxy resins, each independently having an epoxy equivalent weight of at least 2; 30 to 200 parts by weight of an aromatic dianhydride curing agent of the formula

##STR00001##

wherein T and y are as provided herein; and 0.1 to 5 parts by weight of a heterocyclic accelerator, based on the total parts by weight of the epoxy resin composition and the aromatic dianhydride curing agent, wherein the heterocyclic accelerator comprises a substituted or unsubstituted C.sub.3-6 heterocycle comprising 1 to 4 ring heteroatoms, wherein each heteroatom is independently the same or different, and is nitrogen, oxygen, phosphorus, silicon, or sulfur, wherein the composition does not contain a monoanhydride curing agent.

A curable epoxy composition comprises 100 parts by weight of an epoxy resin composition comprising one or more epoxy resins, each independently having an epoxy equivalent weight of at least 2; 30 to 200 parts by weight of an aromatic dianhydride curing agent of the formula

##STR00001##

wherein T and y are as provided herein; and 0.1 to 5 parts by weight of a heterocyclic accelerator, based on the total parts by weight of the epoxy resin composition and the aromatic dianhydride curing agent, wherein the heterocyclic accelerator comprises a substituted or unsubstituted C.sub.3-6 heterocycle comprising 1 to 4 ring heteroatoms, wherein each heteroatom is independently the same or different, and is nitrogen, oxygen, phosphorus, silicon, or sulfur, wherein the composition does not contain a monoanhydride curing agent.

The present invention aims to provide a thermoplastic polyester elastomer having particularly excellent extrusion moldability and extrusion molding stability, from which a hollow and long molded article can be stably produced with a uniform thickness for a long time. A polyester elastomer comprising a hard segment made of a polyester constituted of an aromatic dicarboxylic acid and an aliphatic or alicyclic diol and a soft segment made of an aliphatic polycarbonate, wherein the hard segment and the soft segment are bonded to each other, wherein the polyester elastomer is at least partially end-capped with a reactive compound, wherein the reactive compound comprises a polycarbodiimide, wherein the polyester elastomer has an acid value of 15 eq/ton or less, and wherein, under a condition of 230? C., the polyester elastomer satisfies (i) the melt viscosity at a shear rate of 10/sec after a preheating time of 5 minutes is 1,800 Pa.Math.s or more, and the melt viscosity at a shear rate of 1,000/sec after a preheating time of 5 minutes is 800 Pa.Math.s or less; and (ii) a ratio of the melt viscosity measured at a shear rate of 10/sec after a preheating time of 5 minutes to the melt viscosity measured at a shear rate of 10/sec after a preheating time of 25 minutes is 0.7 to 1.3.