Compositions and methods for amorphous high temperature polyketone polymers incorporating 2H-benzimidazol-2-one with dihalobenzophenone and bis(halobenzoyl)benzene as comonomer units are described herein. The polyketones polymers have advantageous properties, particularly in terms of high glass transition temperatures (T.sub.g), inherently flame resistance, good mechanical properties at elevated temperature, chemical resistance and dimensional stability in wet environment. The polymers are suitable for manufacturing high temperature molded systems and other articles of manufacture via injection molding, extrusion, compression molding, coating, blow molding, thermoforming, rotational molding and additive manufacturing.

A thermoplastic composite material includes a thermoplastic polymer matrix component, a microparticle component, a nanoparticle component, and a compatibilizing agent component, at least a portion of the microparticle component and/or nanoparticle component is a natural fiber.

The present application relates to a fiber reinforced thermoplastic composite sheet and a method for preparing the same. The fiber reinforced thermoplastic composite sheet has on its surface a marble texture effect obtained by laminating cut pieces of a continuous fiber reinforced thermoplastic composite unidirectional tape, wherein the fibers and the resin used in the continuous fiber reinforced thermoplastic composite unidirectional tape have different colors. The thermoplastic composite sheet may be prepared using a simple and quick method, and meet individual requirements of surface appearance of the final product.

An object of the present invention is to provide an epoxy resin composition that can be preferably used for prepreg and fiber reinforced composite material applications and is excellent in elastic modulus, strength, and pot life.

The present invention is the epoxy resin composition including the following components [A] to [C] and satisfying the following conditions (1) to (3): [A]: epoxy resin [B]: polyamine curing agent, and [C]: a compound having a boiling point of 130° C. or more and a molecular weight m of 50 or more and 250 or less, the compound having no epoxy group in the molecule and having substantially no curing ability of an epoxy resin, and (1): at least a part of the component [C] has two or more alcoholic hydroxyl groups in the molecule. (2): the ratio C/E of the amount by mole, E, for epoxy groups of the component [A] to the amount by mole, C, of the component [C] satisfying the condition (1) is 0.01 or more and 0.20 or less. (3): the viscosity at 70° C. for 2 hours is 5.0 times or less the initial viscosity at 70° C.

A composition for fiber-reinforced resin that provides a fiber-reinforced resin with sufficient mechanical strength. The composition for fiber-reinforced resin contains at least one resin (A) selected from the group consisting of rosin resins, petroleum resins, terpene resins, and hydrides of cyclic ketone-aldehyde resins, and the resin (A) has a softening point of 80° C. to 180° C.

An object of the present invention is to provide a fiber-reinforced composite material achieving both lightweight properties and mechanical properties, a laminate thereof, and a prepreg capable of easily molding a sandwich structure thereof. The present invention is a prepreg comprising a reinforced fiber substrate (B) impregnated with a resin (A), wherein the reinforced fiber substrate (B) exists in a folded state having a plurality of folds with a fold angle of 0° or more and less than 90° in the prepreg.

An epoxy resin mixture which contains an epoxy resin represented by Formula (1) below and an epoxy resin represented by Formula (2) below at a weight ratio of 1:5 to 1:0.2. (In Formula (1), plural R1's each exist independently and represent a hydrogen atom or a C1-10 alkyl group, n represent a real number of 1 to 10, and G represents a substituted or unsubstituted glycidyl group.) (In Formula (2), plural R2's and R3's each exist independently and represent a hydrogen atom or a C1-10 alkyl group, n represents a real number of 1 to 10, and G represents a substituted or unsubstituted glycidyl group.)

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The present invention provides a polyfunctional phenolic resin and a polyfunctional epoxy resin having low viscosity and having excellent mechanical properties and heat resistance of a cured product to be obtained, a curable resin composition containing these, and a cured product thereof. Specifically, provided are a polyfunctional phenolic resin formed with a naphthol structure optionally having a substituent on an aromatic ring and a catechol structure optionally having a methyl group as a substituent on an aromatic ring bonded together via a methylene group optionally having a substituent, a polyfunctional epoxy resin obtained by epoxidizing the polyfunctional phenolic resin, a curable resin composition containing any of these, and a cured product thereof.

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.