The problem is solved by the present invention, which aims to provide a prepreg that allows continuous laying-up of prepreg layers while preventing the reinforcing fibers or the matrix resin from being partly deposited on the automated lay-up device, when such a device is used with the aim of producing a fiber-reinforced composite material having a high toughness and impact resistance.

A prepreg comprising the components [A] to [E] given below, meeting the requirements (i) to (iii) given below, and serving to produce a cured product having a reinforcing fiber layer defined as the region ranging from 8% to 92% depth from the surface in the thickness direction that contains a first epoxy resin composition in which 90 mass % or more of the component [A] exists, and two surface resin layers each defined as the region ranging from either surface to a depth of 8% exclusive in the thickness direction that contain a second epoxy resin composition in which 85 mass % or more of the component [E] exists, (i) the second epoxy resin composition includes the components [B] to [E] of which the component [C] accounts for 8 to 24 parts by mass relative to 100 parts by mass of the second epoxy resin composition, (ii) the second epoxy resin composition has a storage elastic modulus G′ in the range of 1.0×10.sup.4 to 3.0×10.sup.6 Pa when measured at 25° C. and an angular frequency of 3.14 rad/s, and (iii) plies of the prepreg laid up after being left to stand for 24 hours at room temperature show a peel strength of 0.1 N/mm or more at 35° C., [A] a carbon fiber, [B] an epoxy resin containing the components [b1] and [b2] specified below, [b1] a di- or less-functional epoxy resin containing, in a molecule, at least one ring structure having four- or more-membered ring and a glycidyl amine group bonded to a ring structure, [b2] a tri- or more-functional epoxy resin, [C] a thermoplastic resin with a weight-average molecular weight of 2,000 to 30,000 g/mol, [D] diaminodiphenyl sulfone, [E] particles having a volume-average particle size of 5 to 50 μm and insoluble in the component [B].

A fiber-reinforced plastic substrate is described in which a plurality of resins having different properties are firmly compounded and that includes components [A], [B], and [C]: [A] reinforcing fibers; [B] thermoplastic resin (b); and [C] thermoplastic resin (c),
wherein the component [A] is arranged in one direction, in the fiber-reinforced plastic substrate, a resin area including the component [B] and a resin area including the component [C] are present, the resin area including the component [B] is present on a surface of one side of the fiber-reinforced plastic substrate, and a distance Ra.sub.(bc) between Hansen solubility parameters of the component [B] and the component [C] satisfies formula (1):

Ra.sub.(bc)={4(δDB−δDC).sup.2+(δPB−δPC).sup.2+(δHB−δHC).sup.2}.sup.1/2≥8

wherein Ra.sub.(bc), δDB, δDC, δPB, δPC, δHB and δHC are as defined.

A primer-attached thermoplastic resin material having a thermoplastic resin material and one or plural primer layers laminated on the thermoplastic resin material, wherein at least one layer of the primer layers is an in-situ polymerizable composition layer of an in-situ polymerizable composition polymerized on the thermoplastic resin material.

In some examples, a method includes forming a material layer on a substrate, partially polymerizing a component of the material layer, to form fluid-filled droplets within a partially polymerized matrix, deforming the material layer to form anisotropic fluid-filled droplets, and further polymerizing the partially polymerized matrix to form an anisotropic voided polymer, including anisotropic voids in a polymer matrix. The anisotropic voids may include anisotropic nanovoids. Example methods may further include depositing electrodes on the anisotropic voided polymer so that at least a portion of the anisotropic voided polymer is located between the electrodes. Examples may include forming electroactive elements including an anisotropic nanovoided polymer, and devices (such as sensors and/or actuators) including electroactive elements.

In some examples, a device includes a multilayer structure, a first electrode, and a second electrode, where the multilayer structure is located at least in part between the first electrode and the second electrode, and the multilayer structure includes a nanovoided polymer layer, and a solid layer. The solid layer may include a non-nanovoided layer. The nanovoided polymer layer may be an electroactive layer. The device may further include a control circuit configured to apply an electrical potential between the first electrode and the second electrode, which may induce a mechanical deformation of the multilayer.

A powdery and/or granular material which achieves excellent dispersibility of fine polymer particles in a matrix resin is provided. The powdery and/or granular material contains specific fine polymer particles (A) and a specific resin (B), and has pores with an average pore diameter of 0.03 μm to 1.00 μm, where a total volume of the pores is not less than 0.0600 mL/g.

A resin composition includes 60 parts by weight of a maleimide resin; 10 parts by weight to 30 parts by weight of an epoxy resin of Formula (I), wherein n represents an integer of 0 to 10: and 2 parts by weight to 40 parts by weight of a methylenebis (diethylaniline). Moreover, an article may be made from the resin composition, including a prepreg, a resin film, a laminate or a printed circuit board. ##STR00001##

The present invention relates to an anti-tack formulation of high solids content that uses effective amounts of a fine particle size talc, a water soluble cationic polymer, one or more nonionic surfactants, and one or more alkali metal fatty acid soaps. The high solids content anti-tack formulation is capable of being easily shipped to a customer's location and is stable and easily pumped after shipment to a customer. The high solids content anti-tack formulation generates a micro-flocculated pigment dispersion that can be subsequently diluted to a low solids content formulation for use in anti-tack applications, particularly rubber slab dipping applications. The anti-tack formulation provides improved anti-tack performance when coating uncured rubber products.

A laminated body including: a substrate; a storage layer; and a buffer layer disposed in this order, in which the storage layer is formed of a cured product of a composition containing a polyfunctional monomer (a1), inorganic particles (a2), and a surfactant (a3), the buffer layer is formed of a cured product of a composition containing a polyfunctional monomer (b1) and inorganic particles (b2), a content mass of the inorganic particles (a2) is 30% by mass or more, a content mass of the inorganic particles (b2) is 30% by mass or more, and the polyfunctional monomer (a1) and the polyfunctional monomer (b1) contain a polyfunctional monomer having a molecular weight per epoxy group in one molecule of 200 g/mol or more.

A metal sheet (Al alloy A6061) with a thickness of 0.2 to 1.0 mm with one component epoxy adhesive painted on a surface thereof having been subjected to chemical treatment is joined by adhesion with a plate material of CFRP prepared by laminating CFRP prepregs having carbon fiber aligned in uni-direction or having crossing carbon fiber. A metal plate (a high strength Al alloy material) is joined by adhesion with the metal sheet to be an integrated object via a layer of cured adhesive of epoxy resin adhesive having a thickness after adhesion of 0.3 mm or more. The integrated object can endure large change of temperature because of deformation of the layer of cured adhesive. A basic technique is provided such that a structure of CFRP joined by adhesion with a high strength metal material that can endure a severe several thousand cycle thermal shock test is prepared, enabling an aircraft, an automobile and a moving-type robot to be of a lighter weight.