A structural reinforcement for an article including a carrier (10) that includes: (i) a mass of polymeric material (12) having an outer surface; and (ii) at least one fibrous composite Insert (14) or overlay (980) having an outer surface and including at least one elongated fiber arrangement (e.g., having a plurality of ordered fibers). The fibrous Insert (14) or overlay (980) is envisioned to adjoin the mass of the polymeric material in a predetermined location for carrying a predetermined load that Is subjected upon the predetermined location (thereby effectively providing localized reinforcement to that predetermined location). The fibrous insert (14) or overlay (980) and the mass of polymeric material (12) are of compatible materials, structures or both, for allowing the fibrous insert or overlay to be at least partially joined to the mass of the polymeric material. Disposed upon at least a portion of the carrier (10) may be a mass of activatable material (126). The fibrous insert (14) or overlay (980) may include a polymeric matrix that includes a thermoplastic epoxy.

An amine hardener system useful for curing a curable resin composition including a blend of: (I) a first amine hardener comprising at least one cycloaliphatic amine; and (II) a second amine hardener comprising at least one polyetheramine; and a curable epoxy resin composition including (A) at least one epoxy resin compound; and (B) at least one curing agent; wherein the at least one curing agent includes the above amine hardener system.

Disclosed are a resin composition, and prepreg, laminate and copper clad laminate using the same, and degrading method thereof, the resin composition comprising: an epoxy resin, a degradable amine curing agent, a degradable mercaptan curing agent and an inorganic filler. A copper clad laminate manufactured by the resin composition comprises several pieces of stacked prepreg, and copper foil arranged at one side or two sides of stacked prepreg, each of the prepreg comprising a reinforced material and the resin composition adhered thereon after soaking and drying. The present invention mixes the degradable amine curing agent and the degradable mercaptan curing agent to obtain a curing system having an adjustable reaction rate, thus facilitating process control when manufacturing the copper clad laminate, and the manufactured copper clad laminate has high overall performance and is completely degradable, thus recycling and reusing each of the effective components.

The present invention relates to an isocyanate-modified epoxy resin having a structure of Formula (I): in Formula (I), R is selected from divalent organic groups; n is an integer greater than or equal to zero; in Y, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.18, R.sub.19, R.sub.20, R.sub.21 are independently selected from organic groups; X is omitted or is selected from divalent organic groups; and R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.18, R.sub.19, R.sub.20, R.sub.21 are not hydrogen atoms at the same time. The epoxy resin of the present invention utilizes polyisocyanate containing more than 2 cyanate groups as a raw material for preparation and reacts it with resin monomer having epoxy group, thereby achieving the purpose of introducing oxazolidinonyl into epoxy resin monomer; in addition, the epoxy resin of the present invention is terminated by epoxy groups, making the provided epoxy resin components have high heat resistance and low dielectric properties.

A thermosetting sheet according to the present invention includes: a thermosetting resin; a thermoplastic resin; and conductive particles. The conductive particles includes silver particles having an average particle size D.sub.50 of 0.01 μm or more and 10 μm or less, and having a circularity in cross section of 0.7 or more. The thermosetting sheet has a viscosity at 100° C. of 20 kPa.Math.s or more and 3000 kPa.Math.s or less.

The invention enhances the production efficiency in the production of prepreg by allowing the arrangement property and rectilinearity of reinforcing fibers to be well maintained, allowing the basis weight uniformity of an applied resin to be good, and further allowing a high line speed and suppression of contamination in the process to be achieved. The invention provides a method of producing a prepreg, which includes: discharging a molten resin from a discharge portion; introducing the discharged resin by an air flow; and capturing the discharged resin on a reinforcing fiber sheet conveyed continuously, wherein a key point is that the discharged resin is captured in a region in which the reinforcing fiber sheet is conveyed substantially in planar form.

A prepreg, which includes a carbon fiber reinforced material, has excellent Mode I interlaminar toughness, Mode II interlaminar toughness, and tensile strength. The prepreg includes the following constituents [A] to [C] and satisfies the following conditions (I) and (II): [A]: a carbon fiber; [B]: an epoxy resin; and [C]: a hardener for [B], and (I) a surface oxygen concentration O/C of [A] measured by X-ray photoelectron spectroscopy is 0.10 or more; and (II) a cured product obtained by curing [B] and [C] includes a resin region having molecular anisotropy exhibiting interference fringes in polarizing microscope observation in a crossed Nicol state.

An object of the present invention is to provide a prepreg and a laminate for producing a laminate suitable as a structural material, which have excellent joining strength and can be firmly integrated with another structural member by welding. The present invention provides a prepreg including the following structural components: [A] reinforcing fibers, [B] a thermosetting resin, and [C] a thermoplastic resin, wherein [A] has a surface free energy, measured by a Wilhelmy method, of 10 to 50 mJ/m.sup.2, [C] is present on a surface of the prepreg, and the reinforcing fibers [A] are present, which are included in a resin area including [B] and a resin area including [C] across an interface between the two resin areas.

An epoxy resin having end groups each having an epoxy group that are disposed at both ends respectively, and between the end groups, either or both of a first structure in which an aromatic cyclic group, an ether oxygen, a methylene group, an aromatic cyclic group, a methylene group, an ether oxygen and an aromatic cyclic group are bonded together in this order and a second structure in which an aromatic cyclic group, a methylene group, an ether oxygen, an aromatic cyclic group, an ether oxygen, a methylene group and an aromatic cyclic group are bonded together in this order.

Disclosed are a glass fiber tape, a surface modification method and an application thereof. The surface modification method includes the determination of an optimal decarburizing condition of the glass fiber tape, the decarburization of the glass fiber tape, and the coating of palmitic acid.