647 results about "Pre-preg" patented technology

A process and associated apparatus used to prepare a thermoplastic composite from a plurality of plies of thermoplastic resin prepregs. The prepregs are formed into a composite structure under two chambers; a rigid outer chamber (of any convenient size or shape) and a second flexible inner chamber containing a prepreg lay-up. The absolute pressures are reduced concurrently in a stepwise method in both chambers. This concurrent, stepped pressure reduction is accomplished at a rate which prevents the vacuum bag from moving far from the prepregs, and prevents wrinkles from forming in the prepregs. Pinching off the diffusion paths required for the removal of unwanted gases is eliminated. The lay-up is then heated and the absolute pressure in the outer rigid chamber is increased. This pressure constrains the flexible inner chamber during out-gassing of the thermoplastic resin, preventing wrinkles from forming in the prepregs. The absolute pressure in the outer rigid chamber is increased to atmospheric pressure or greater causing the prepregs to consolidate. A low absolute pressure is maintained in the flexible inner chamber. The temperature is then increased to the cure temperature of the resin and held for a time sufficient for the resin to cure. The resulting consolidated thermoplastic resin is substantially void free and detectable wrinkles are absent.

A woven fabric prepreg comprising at least [A] a woven fabric as reinforcing fibers, [B] a thermosetting resin or thermosetting resin composition and [C] fine particles of a resin and having a cover factor of 95% or more, and a honeycomb sandwich panel, comprising skin panels fabricated by said woven fabric prepreg and [D] a honeycomb core can be obtained. The woven fabric prepreg little changes in tackiness with the lapse of time and has moderate drapability, being excellent in self adhesiveness to the honeycomb core when used as skin panels of a honeycomb sandwich panel. Furthermore, the honeycomb sandwich panel obtained has a small porosity in the skin panels fabricated by the cured prepreg and has excellent surface smoothness with few pits and depressions on the surfaces of the skin panels.

This invention relates to a shapable prepreg comprising fibers and a polymeric matrix. The polymeric matrix is a multiphase matrix comprisinga first matrix component consisting of a monomer or a dendrimer, anda second matrix component consisting of high molecular weight organic molecules, said second matrix component forming a sticky membrane of the prepreg with an interpenetrating polymer network (IPN) bonding to the first matrix component. Preferably, the prepreg further comprises a third matrix component consisting of high molecular weight organic molecules, said third component being distributed between the fibers.

A prepreg containing a carbon fiber [A] and a thermosetting resin [B], and in addition, satisfying at least one of the following (1) and (2).

• (1) a thermoplastic resin particle or fiber [C] and a conductive particle or fiber [D] are contained, and weight ratio expressed by [compounding amount of [C] (parts by weight)]/[compounding amount of [D] (parts by weight)] is 1 to 1000.
• (2) a conductive particle or fiber of which thermoplastic resin nucleus or core is coated with a conductive substance [E] is contained.

In order to realize the objectives stated above, the thermosetting resin composition for carbon fiber reinforced composite materials of the present invention chiefly comprises the following components. (A) Thermosetting resin (B) Compound containing one functional group which can react with thermosetting resin (A) or its curing agent, and a moiety selected from the following formulae (1) to (4) Furthermore, the present invention also relates to a prepreg formed by impregnating reinforcing fiber with the aforesaid resin composition and to carbon fiber reinforced composite materials comprising reinforcing fiber and a cured aforesaid thermosetting resin composition. In accordance with the present invention, there can be obtained a thermosetting resin composition where the adhesion to reinforcing fiber by the cured material and the elastic modulus of the cured material are excellent, and by using this resin composition there can be obtained carbon fiber reinforced composite materials which are excellent in their 0° compressive strength, 90° tensile strength and interlaminar shear strength, and which also have outstanding impact resistance.

The present disclosure pertains to composite articles, and in particular a composite face plate for a golf club-head, and methods for making the same. In certain embodiments, a composite face plate for a club-head comprises a lay-up of multiple, composite prepreg plies. The face plate can be made by first forming an oversized lay-up of multiple prepreg plies having a central portion and a sacrificial portion surrounding the central portion. The lay-up is at least partially cured in a mold under elevated pressure and heat. The lay-up is then removed from the mold and the sacrificial portion is removed from the central portion to form a composite part that is substantially free of defects.

A first parting film is held on a first flat laminating table in close contact with the first flat laminating table, and then wide prepregs are laid for plane lamination on the first parting film to form a large prepreg-laminate having a large area. A second parting film is held on a second flat laminating table in close contact with the second flat laminating table by suction, and then narrow prepregs to form a gridlike prepreg-laminate. The large prepreg-laminate is floated up by jetting air from the first flat laminating table is cut on a cutting table to obtain a prepreg-laminate skin. The gridlike prepreg-laminate is processed similarly to obtain a prepreg-laminate doubler. The prepreg-laminate skin and the prepreg-laminate doubler are carried from the cutting table to a laminating mold having a single-contour laminating surface so as to be superposed and are laminated to form a composite panel.

Engineered crosslinked thermoplastic particles are useful for interlaminar toughening of pre-pregs and composite materials.

The cut laminate edges of aircraft fuel tanks formed of carbon fiber reinforced polymers are sealed to prevent the exposure of carbon fibers to combustible fuel. The edge seal is produced from a prepreg form using a thermosetting resin matched to the characteristics of the resin used in the laminate. The prepreg form can be applied to the cut laminate edges either before or after the laminate is cured. The edge seal acts a dielectric layer that both electrically insulates the cut laminate edges from the fuel and mechanically contains energetic particles produced at the edges due to lighting strikes or other sources of electrical charges.

Systems and methods for the fabrication of prepregs possessing enhanced ability for the removal of gases from within prepregs and prepreg layups prior to and/or during at least a portion of consolidation and cure process to form composite structures are disclosed. In certain embodiments, perforations of selected configurations may be introduced into the prepregs prior to, during, and after layup. The perforations provide routes for gases trapped within and between the perforated prepregs and prepreg lay-ups to escape during consolidation and cure process, reducing the residual porosity within the resulting composite. For example, composites having residual porosities less than 10 vol. %, on the basis of the volume of the composite, may be achieved in this manner.

A vinyl-compound-based resin composition containing a terminal vinyl compound (a) of a bifunctional phenylene ether oligomer having a polyphenylene ether structure, a naphthol aralkyl type cyanate ester resin (b), a bisphenol A cyanate ester resin (c), a brominated flame retardant (d) and an inorganic filler (e), which resin composition is for use in a printed wiring board for high multilayer and high frequency and is improved in moldability and copper foil peel strength, which are conventional problems, without any decrease in electric characteristics and heat resistance after moisture absorption while keeping flame retardancy, a prepreg comprising the above resin composition and a glass woven fabric, a metal-foil-clad laminate obtained by disposing a metal foil on one side or both sides of a stack of at least one prepreg and laminate-molding the resultant set, and a resin sheet obtained by applying a solution of the above resin composition to a surface of a metal foil or a film.

A benzoxazine polymer having improved thermal properties. The properties are improved by inserting aromatic polyamines into the monomer, such as phenylenediamine, methylenedianiline, oxydianiline, diaminodiphenylsulfone, 2,2-bis(4-[aminophenoxy]phenyl)propane, 4,4'-oxydianiline, 4,4'-diaminodiphenyl sulfone, and diaminobenzanilide, to introduce internal benzoxazine groups that are crosslinking sites. The improved polymers can be converted into molding compounds, towpregs, and prepregs by being compounded with reinforcing fibers.

This invention has an object of providing a method for producing a multilayer substrate or an electronic part wherein decrease in the thickness has been enabled without causing the problem of insufficient strength or the like in the handling, as well as the electronic part. Such object has been attained by a method for producing a multilayer substrate or an electronic part comprising the steps of adhering a conductor layer to a transfer film, patterning the conductor layer to form a predetermined pattern, placing the transfer film overlaid with the patterned conductor layer on a prepreg so that the side of the conductor layer faces the prepreg, and then adhering the transfer film to the prepreg by applying heat and pressure and peeling the transfer film to produce the prepreg having the conductor layer formed thereon; and the multilayer electronic part produced by such method.

A lightweight fiber-reinforced composite material that exhibits excellent flame resistance and mechanical properties and does not emit any halogen gas at combustion; an epoxy resin composition and prepreg suitable for obtaining the above fiber-reinforced composite material; and an integrated molding suitable to electrical/electronic equipment cabinet, in which use is made of the above fiber-reinforced composite material. There is provided an epoxy resin composition for carbon-fiber-reinforced composite material, comprising: [A] epoxy resin, [B] amine curing agent, and [C] phosphorus compound, the component [C] contained in an amount, in terms of concentration of phosphorus atoms, of 0.2 to 15 wt.%.

A carbon-carbon composite for friction products comprises an outer friction part and a load bearing structure part supporting the friction part. The friction part contains a mixture of carbon fibers, pitch powder and graphite powder, whereas the structure part is comprised of a pack of alternating layers of the mixture and layers of one member selected from the group consisting of carbon fabrics, carbon-based prepregs and carbon-based, segmented prepregs. The carbon-carbon composite is formed by way of aternatingly piling up layers of a mixture of carbon fibers, pitch powder and graphite powder and layers of one member selected from the group consisting of carbon fabrics, carbon-based prepregs and carbon-based, segmented prepregs one above the other to provide a preform, heating and pressing the preform within a mold to obtain a green body, carbonizing the green body to prepare a carbonized body, impregnating the carbonized body with pitch powder and recarbonizing the impregnated body, and subjecting the impregnated and recarbonized body to chemical vapor infiltration with hydrocarbon gas.

The present invention provides a process for producing a prepreg of high modulus reinforcing fibers, the process comprising the steps of: a) providing a reinforcing fiber bundle layer wherein such bundle contains a thermoplastic and/or crosslinking resin within the fiber bundle; b) providing a layer of a thermoplastic and/or crosslinking material layer on at least one side of the high modulus fiber layer of step a); c) compressing the layers from step b) under an appropriate amount of heat and pressure, and thereby producing a prepreg of high modulus reinforcing fibers.

To form a conductive region in a prepreg without opening a through hole in a fibrous body. A wiring substrate is provided, including: an organic resin layer and a fibrous body, wherein the fibrous body is impregnated with the organic resin layer; and a wiring with which the fibrous body is impregnated and which is formed by dissolving the organic resin layer. The wiring is exposed on both surfaces of the organic resin layer and penetrates the fibrous body so that the fibrous body is positioned in the through wiring. Further, a semiconductor device is provided by adhering an integrated circuit chip having a bump to the wiring substrate so that the bump is in contact with the wiring.

According to one embodiment of the invention, a co-cured vacuum-assisted resin transfer molding manufacturing method includes providing a tool base, disposing a prepreg skin panel outwardly from the tool base, disposing one or more tooling details outwardly from the prepreg skin panel, and disposing one or more preforms proximate the one or more tooling details. The one or more preforms are either dry or binderized. The method further includes disposing a high permeability medium between the one or more tooling details and the one or more preforms, enclosing the prepreg skin panel, the one or more tooling details, the one or more preforms, and the high permeability medium with at least one vacuum bag, pulling a vacuum on the vacuum bag, infusing the one or more preforms with a resin, and curing the one or more preforms and the prepreg skin panel.

It is an object of the present invention to provide a high frequency-capable printed wiring board material reduced in the dielectric loss tangent, weight, thickness and cost without compromising the workability, and provide electronic components using the same. The present invention provides a prepreg obtained by using a quartz glass cloth composed of low-density quartz glass fibers as a base material and impregnating the cloth with a thermosetting resin composition having a low dielectric loss tangent, and provides electronic components using a cured product of the prepreg as an insulating layer.

A laminate panel especially well suited to help form an overhead stowage bin door on an aircraft, wherein the door includes a portion of a high contrast color advertising mural or message integrally formed therewith. The door includes a honeycomb support layer on which at least one fiberglass pre-preg layer is formed. A polyvinyl fluoride (PVF) film is used as a substrate for the color mural or message. A ultraviolet (UV) curable ink is deposited directly on the PVF film via an ink jet printing process that produces a high color density, high color contrast image. The PVF film in one form is a Tedlar® PVF film. The ink is cured virtually immediately after it is deposited on the PVF film. An additional layer of PVF film is then secured to a side of the printed-on PVF film opposite to that on which the ink is deposited via a layer of embossing resin to form the laminate panel. The laminate panel is then secured via a suitable adhesive to the fiberglass pre-preg and honeycomb support layer in a subsequent manufacturing step. The stowage bin door and process of making same enable a portion of a high color density, high contrast image, advertising mural or message to be integrally formed with the door.

Prepreg compositions and methods of making them from particles and a binder composition are disclosed. The methods may include placing the particles on a moving conveying belt and applying the binder composition to the particles on the moving conveying belt to form a moving mass. Alternate methods may include first placing the binder composition on the moving conveying belt and then applying the particles to the binding composition to form the moving mass. The methods may further include passing the moving mass through one or more pairs of opposed, compacting rolls, where the particles and the binder composition are pressed into further contact while passing through the compacting rolls to form the prepreg. The binder composition in the prepreg may include monomers and/or oligomers of a polymer that are capable of polymerizing into the polymer under polymerization conditions.