Abstract: An object of the present invention is to provide an epoxy resin composition that provides, when used for an insulation layer of a multilayer printed wiring board, a multilayer printed wiring board which is excellent in plating adhesion, heat resistance and moisture resistance reliability and capable of forming fine wiring. Another object of the present invention is to provide a resin sheet, a prepreg, a method for producing a multilayer printed wiring board, a multilayer printed wiring board and a semiconductor device. These objects are achieved by an epoxy resin composition comprising (A) an epoxy resin, (B) a phenoxy resin having a specific bisphenol acetophenone structure and (C) a curing agent, wherein the content of the phenoxy resin (B) is 10 to 30% by weight of the total solid content of the resin composition.

Abstract: An object of the invention is to provide a prepreg which can be thinner, and has both surfaces which have different application, function, performance or properties to each other, one of which has excellent adhesion to the conductive layer, and the conductive layer which is in contact with the one surface of the prepreg can form a fine circuit, and the present invention provides a prepreg including a core layer containing a fibrous base, a first resin layer which is formed on one surface of the core layer, a second layer which is formed on the other surface of the core layer, and a carrier film which is selected from the group consisting of a metal foil and a resin film and which is laminated on at least one of the surfaces of the first resin layer and the second resin layer, wherein the first resin layer contains a first epoxy resin composition containing silica nanoparticles having an average particle diameter of 1 to 100 nm; a thermoplastic resin selected from the group consisting of a polyimide resin, a p

Abstract: Disclosed is an insulating resin sheet laminate (an insulating resin sheet with a film or a metal foil) including an insulating resin layer with a uniform thickness that is formed without repulsion or unevenness in a process of forming the insulating resin layer on a film or a metal foil, and a multi-layer printed circuit board that includes the insulating resin sheet laminate and possesses high insulating reliability. The present invention provides an insulating resin sheet laminate (an insulating resin sheet with a film or a metal foil) obtained by forming an insulating resin layer made of a resin composition on a film or a metal foil, and the resin composition includes an acrylic surfactant.

Abstract: A resin sheet with a copper foil, comprising: a carrier layer; a copper foil layer having a thickness 0.5 to 5 ?m provided over the carrier layer; and an insulating resin layer formed over the copper foil layer, wherein the insulating resin layer is once abutted with base material, and then the carrier layer is delaminated from the copper foil layer, and wherein the insulating resin layer contains a cyanate ester resin having phenolic novolac backbone and a polyfunctional epoxy resin.

Abstract: An object of the present invention is to provide a resin composition having excellent impregnation property into a base material and capable of producing a prepreg, metal-clad laminate and printed wiring board excellent in properties such as low warpage, flame resistance, low thermal expansion properties, drill processability and desmear resistance. A first resin composition comprises an epoxy resin, an irregular-shaped first inorganic filler and a second inorganic filler having an average particle diameter of 10 to 100 nm which is different from that of the first inorganic filler. A second resin composition comprises an epoxy resin, silicone rubber particles having an average particle diameter of 1 ?m to 10 ?m, boehmite particles having an average particle diameter of 0.2 ?m to 5 ?m, and silica nanoparticles having an average particle diameter of 10 nm to 100 nm.

Abstract: Disclosed are a composite body, a method for producing the composite body and a semiconductor device, the composite body comprising a resin layer and a fine wiring and/or via hole being formed in the resin layer, having high adhesion and high reliability, and being capable of high frequencies. Also disclosed are a resin composition and a resin sheet, both of which can provide such a composite body. The composite body comprises a resin layer and an electroconductive layer, wherein a groove having a maximum width of 1 ?m or more and 10 ?m or less is on a surface of the resin layer; the electroconductive layer is inside the groove; and a surface of the resin layer being in contact with the electroconductive layer has an arithmetic average roughness (Ra) of 0.05 ?m or more and 0.

Abstract: A resin sheet with a copper foil, comprising: a carrier layer; a copper foil layer having a thickness 0.5 to 5 ?m provided over the carrier layer; and an insulating resin layer formed over the copper foil layer, wherein the insulating resin layer is once abutted with base material, and then the carrier layer is delaminated from the copper foil layer, and wherein the insulating resin layer contains a cyanate ester resin having phenolic novolac backbone and a polyfunctional epoxy resin.

Abstract: An object of the present invention is to provide an epoxy resin composition that provides, when used for an insulation layer of a multilayer printed wiring board, a multilayer printed wiring board which is excellent in plating adhesion, heat resistance and moisture resistance reliability and capable of forming fine wiring. Another object of the present invention is to provide a resin sheet, a prepreg, a method for producing a multilayer printed wiring board, a multilayer printed wiring board and a semiconductor device. These objects are achieved by an epoxy resin composition comprising (A) an epoxy resin, (B) a phenoxy resin having a specific bisphenol acetophenone structure and (C) a curing agent, wherein the content of the phenoxy resin (B) is 10 to 30% by weight of the total solid content of the resin composition.

Abstract: Disclosed is an insulating resin sheet laminate (an insulating resin sheet with a film or a metal foil) including an insulating resin layer with a uniform thickness that is formed without repulsion or unevenness in a process of forming the insulating resin layer on a film or a metal foil, and a multi-layer printed circuit board that includes the insulating resin sheet laminate and possesses high insulating reliability. The present invention provides an insulating resin sheet laminate (an insulating resin sheet with a film or a metal foil) obtained by forming an insulating resin layer made of a resin composition on a film or a metal foil, and the resin composition includes an acrylic surfactant.