Provided are a curable composition which is rapidly curable and which gives cured products with good heat resistance, a cured product thereof, a fiber-reinforced composite material, a fiber-reinforced resin-molded article, and a method for manufacturing the fiber-reinforced resin-molded article. Provided are a curable composition containing an epoxy resin (A), an aliphatic and/or alicyclic amine compound (B), and an imidazole compound (C), wherein the ratio H/E of the number of moles H of active hydrogen in the aliphatic and/or alicyclic amine compound (B) to the number of moles E of an epoxy group in the epoxy resin (A) is in the range of 0.2 to 0.9; a cured product thereof; a fiber-reinforced composite material; a fiber-reinforced resin-molded article; and a method for manufacturing the fiber-reinforced resin-molded article.

Provided are a curable composition which is rapidly curable and which gives cured products with good heat resistance, a cured product thereof, a fiber-reinforced composite material, a fiber-reinforced resin-molded article, and a method for manufacturing the fiber-reinforced resin-molded article. Provided are a curable composition containing an epoxy resin (A), an aliphatic and/or alicyclic amine compound (B), and an imidazole compound (C), wherein the ratio H/E of the number of moles H of active hydrogen in the aliphatic and/or alicyclic amine compound (B) to the number of moles E of an epoxy group in the epoxy resin (A) is in the range of 0.2 to 0.9; a cured product thereof; a fiber-reinforced composite material; a fiber-reinforced resin-molded article; and a method for manufacturing the fiber-reinforced resin-molded article.

A fiber reinforced thermoplastic resin molded article includes a thermoplastic resin [A] and carbon fibers [B], a content of the thermoplastic resin [A] being 50 to 95 parts by weight and a content of the carbon fibers [B] being 5 to 50 parts by weight per 100 parts by weight of a total of the thermoplastic resin [A] and the carbon fibers [B], the molded article having a bending elastic modulus of 30 GPa or more, an interfacial shear strength between the thermoplastic resin [A] and the carbon fibers [B] being 15 MPa or more, and a logarithmic decrement of the molded article calculated by Formula (1) of less than 3, wherein the carbon fibers [B] have a weight-average fiber length (L.sub.w) of 0.5 to 10.0 mm:

Logarithmic decrement δ=(1/n)×ln(α.sub.(1)/α.sub.(1+n))  (1).

A fiber reinforced thermoplastic resin molded article includes a thermoplastic resin [A] and carbon fibers [B], a content of the thermoplastic resin [A] being 50 to 95 parts by weight and a content of the carbon fibers [B] being 5 to 50 parts by weight per 100 parts by weight of a total of the thermoplastic resin [A] and the carbon fibers [B], the molded article having a bending elastic modulus of 30 GPa or more, an interfacial shear strength between the thermoplastic resin [A] and the carbon fibers [B] being 15 MPa or more, and a logarithmic decrement of the molded article calculated by Formula (1) of less than 3, wherein the carbon fibers [B] have a weight-average fiber length (L.sub.w) of 0.5 to 10.0 mm:

Logarithmic decrement δ=(1/n)×ln(α.sub.(1)/α.sub.(1+n))  (1).

A fiber-reinforced resin molding material includes at least components (A) to (D), wherein the fiber-reinforced resin molding material has a weight loss on heating, when heated at 300° C. for 10 minutes either in a nitrogen atmosphere or in an air atmosphere, of 1.5% or less, and components (A) to (D) are:

(A) an amorphous thermoplastic resin: 100 parts by weight
(B) a reinforcement fiber: 4 to 60 parts by weight
(C) a phosphorus-based flame retardant: 20 to 60 parts by weight
(D) an antioxidant (D): 1.0% by weight or more.

A fiber-reinforced resin molding material includes at least components (A) to (D), wherein the fiber-reinforced resin molding material has a weight loss on heating, when heated at 300° C. for 10 minutes either in a nitrogen atmosphere or in an air atmosphere, of 1.5% or less, and components (A) to (D) are:

(A) an amorphous thermoplastic resin: 100 parts by weight
(B) a reinforcement fiber: 4 to 60 parts by weight
(C) a phosphorus-based flame retardant: 20 to 60 parts by weight
(D) an antioxidant (D): 1.0% by weight or more.

A method of making a flexible pipe layer, which method comprises: commingling polymer filaments and carbon fibre filaments to form an intimate mixture, forming yarns of the commingled filaments, forming the yarns into a tape, and applying the tape to a pipe body to form a flexible pipe layer.

A method of making a flexible pipe layer, which method comprises: commingling polymer filaments and carbon fibre filaments to form an intimate mixture, forming yarns of the commingled filaments, forming the yarns into a tape, and applying the tape to a pipe body to form a flexible pipe layer.

A method of making a flexible pipe layer, which method comprises: commingling polymer filaments and carbon fibre filaments to form an intimate mixture, forming yarns of the commingled filaments, forming the yarns into a tape, and applying the tape to a pipe body to form a flexible pipe layer.

Polypropylene composition comprising a polypropylene base material, a carbon fibre and an adhesion promoter with an excellent impact/stiffness balance, its preparation, articles comprising the composition and the use of the composition.