This invention relates to a curative composition and its use in curing epoxy resins and prepregs, adhesives and moulded materials derived therefrom. The curative composition comprises a clathrate comprising a host component and a guest component, the host comprising a carboxylic acid or ester compounds as defined or phenolphthalin and the guest comprising an imidazole or imidazoline component.

A method of making an isocyanurate polymer is disclosed. An isocyanate including at least one of an aromatic isocyanate and an aliphatic isocyanate is provided. A trimerization catalyst including at least one of an amine catalyst, an organometallic compound, and an imidazole compound is provided. A reaction mixture that is substantially free of reactive hydrogen is formed by mixing less than about twenty percent by total weight of said reaction mixture of an epoxide with said isocyanate. The trimerization catalyst is mixed with the reaction mixture. The reaction mixture is cured to produce a polymer composition including a reaction product of two or more isocyanates.

A prepreg includes composition elements [A], [B], and [C] described below, [A] a reinforcing fiber, [B] a thermosetting resin, and [C] a thermoplastic resin. [C] is present on a surface of the prepreg, [B] contains a first curing agent [b1] and a second curing agent [b2], and the reinforcing fiber of [A] that crosses over a boundary surface between a resin region containing [B] and a resin region containing [C] and that is in contact with both resin regions is present.

The present disclosure provides a curable resin composition including a thermoset resin, an aliphatic polyketone as a toughener and a hardener. The curable resin composition may be combined with reinforcing fibers and then cured to form a fiber-reinforced composite article having a high glass transition temperature, excellent mechanical properties and low moisture absorption. The fiber-reinforced composite article may be used in various applications, such as in transport applications including aerospace, aeronautical, nautical and land vehicles.

Provided is a useful improvement in a CF-SMC manufacturing technique comprising an SMC manufacturing method using a continuous carbon fiber bundle having a filament number of NK and partially split into n sub-bundles in advance. In the SMC manufacturing method according to the present invention, a fragmentation processing using a fragmentation processing apparatus (A) below is performed on chopped carbon fiber bundles before being deposited on a carrier film. The fragmentation processing apparatus (A) comprises a first pin roller and a second pin roller, each of which has a rotation axis parallel to a rotation axis direction of the rotary cutter. The first pin roller is rotationally driven such that its pins move downward from above on its side facing the second pin roller, and the second pin roller is rotationally driven such that its pins move downward from above on its side facing the first pin roller.

A manufacturing method of an SMC of the present invention comprises (i) forming chopped carbon fiber bundles by chopping a continuous carbon fiber bundle having a filament number of NK with a rotary cutter, (ii) fragmentation-processing the chopped carbon fiber bundles by using a fragmentation-processing apparatus comprising a rotating body, (iii) forming a carbon fiber mat by depositing the fragmentation-processed chopped carbon fiber bundles on a carrier film traveling below the rotary cutter, and (iv) impregnating the carbon fiber mat with a thermosetting resin composition, wherein N is 20 or more, and the fragmentation-processing apparatus comprises a first pin roller and a second pin roller which are disposed side by side, each having a rotation axis parallel to a rotation axis direction of the rotary cutter.

The present invention relates to a fiber-reinforced plastic, including: a reinforcing fiber group containing reinforcing fibers; a thermosetting resin layer containing a first thermosetting resin; and a thermoplastic resin layer, in which the thermoplastic resin layer is provided as a surface layer of the fiber-reinforced plastic, an interface between the thermoplastic resin layer and the thermosetting resin layer is positioned inside the reinforcing fiber group, and the thermoplastic resin layer contains a dispersed phase of a second thermosetting resin.

The present invention relates to a resin composition containing: an epoxy resin; and an aromatic polysulfone resin containing an amino group-containing aromatic polysulfone having an amino group at at least one terminal of a main chain of a polymer chain, in which a number average molecular weight of the aromatic polysulfone resin is 10,000 or less.

A curable epoxy system useful in the production of composites capable of being used in various industries, including, for example, the aerospace industry. In particular, the present disclosure relates to a curable epoxy system comprising (i) an epoxy component selected from bisphenol C diglycidyl ether, one or more derivatives of bisphenol C diglycidyl ether, and combinations thereof, and (ii) 9,9-bis(4-amino-3-chlorophenyl)fluorene.

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.