Abstract:
To provide a film which is excellent in releasing property with respect to a resin sealed portion and excellent in low migration property and peeling property with respect to a semiconductor chip, a source electrode or a sealing glass and which is suitable as a mold release film for producing a semiconductor element having a part of the surface of a semiconductor chip, source electrode or sealing glass exposed. A film 1 which comprises a substrate 3 and an adhesive layer 5, wherein the storage elastic modulus at 180° C. of the substrate 3 is from 10 to 100 MPa, and the adhesive layer 5 is a reaction cured product of a composition for adhesive layer comprising a specific acrylic polymer and a polyfunctional isocyanate compound, wherein the number of moles MOH of hydroxy groups and the number of moles MCOOH of carboxy groups, derived from the acrylic polymer, and the number of moles MNCO of isocyanate groups derived from the polyfunctional isocyanate compound, satisfy a specific relation, and which is suitable as a mold release film for producing a semiconductor element.
Abstract:
A mold release film to be disposed on a cavity surface of a mold in a method for producing a semiconductor package wherein a semiconductor element is disposed in the mold and encapsulated with a curable resin to form a resin-encapsulation portion, characterized in that it has a first surface to be in contact with the curable resin at the time of forming the resin-encapsulation portion, and a second surface to be in contact with the cavity surface, at least one of the first surface and the second surface has irregularities formed thereon, and the surface having irregularities formed thereon, has an arithmetic mean roughness (Ra) of from 1.3 to 2.5 μm and a peak count (RPc) of from 80 to 200; and a process for producing a semiconductor package by using the mold release film.
Abstract:
To provide a mold release film which is excellent in releasability and capable of suppressing contamination of a mold or a resin-encapsulation portion by the mold release film and which is capable of forming a resin-encapsulation portion excellent in adhesion to an ink layer, and a process for producing a semiconductor package using the mold release film. A mold release film to be disposed on a cavity surface of a mold in a method for producing a semiconductor package wherein a semiconductor element is disposed in the mold and encapsulated with a curable resin to form a resin-encapsulation portion, characterized in that it has a first surface to be in contact with the curable resin at the time of forming the resin-encapsulation portion, and a second surface to be in contact with the cavity surface, at least the first surface is made of a fluororesin, and in a specific test method, F/Al is from 0.2 to 4, or F/(C+F+O) is from 0.1 to 0.3.
Abstract:
To provide an adhesive film comprising a polyimide film and a fluorinated resin layer directly laminated, in which blisters (foaming) in an atmosphere corresponding to reflow soldering at high temperature are suppressed, and a flexible metal laminate. An adhesive film having a fluorinated resin layer containing a fluorinated copolymer (A) directly laminated on one side or both sides of a polyimide film, wherein the fluorinated copolymer (A) has a melting point of at least 280° C. and at most 320° C., is melt-moldable, and has at least one type of functional groups selected from the group consisting of a carbonyl group-containing group, a hydroxy group, an epoxy group and an isocyanate group, and the fluorinated resin layer has a thickness of from 1 to 20 μm.
Abstract:
To provide a material for a printed circuit board which is less likely to be warped in a high temperature region (from 150 to 200° C.) while maintaining electrical properties, a metal laminate, methods for producing them, and a method for producing a printed circuit board.A material having a fluorinated resin layer is subjected to a heat treatment. The fluorinated resin layer is composed of a composition containing a fluorinated copolymer (a) having at least one type of functional group selected from the group consisting of a carbonyl group-containing group, a hydroxy group, an epoxy group and an isocyanate group, having a melting point of from 280 to 320° C. and a melt flow rate of at least 2 g/10 min measured at 372° C. under a load of 49 N. The heat treatment is carried out at a temperature of at least 250° C. and lower by at least 5° C. than the melting point of the fluorinated copolymer (a) so that the ratio of the melt flow rate of the fluorinated resin layer after the heat treatment to that before the heat treatment, and the melt flow rate of the fluorinated resin layer after the heat treatment, are respectively within specific ranges.
Abstract:
To provide a mold release film which has excellent mold releasing property and is capable of reducing contamination of a mold in a sealing step; a process for producing the mold release film; and a process for producing a semiconductor package by using the mold release film. The mold release film 1 is a mold release film to be disposed on a surface of a mold which is to be in contact with a curable resin, in the production of a semiconductor package by disposing a semiconductor element in the mold, and sealing it with the curable resin to form a resin sealed portion. This mold release film 1 comprises a resin-side mold release layer 2 to be in contact with the curable resin at the time of forming the resin sealed portion, and a gas barrier layer 3. The gas barrier layer 3 contains at least one polymer (I) selected from the group consisting of a polymer having vinyl alcohol units and a polymer having vinylidene chloride units, and the thickness of the gas barrier layer 3 is from 0.1 to 5 μm.
Abstract:
To provide a mold release film which is not easily electrically charged or curled, does not contaminate a mold, and has excellent mold followability, a process for its production, and a process for producing a semiconductor package by using the mold release film. A mold release film to be disposed on a surface of a mold which is to be in contact with a curable resin, in a process for producing a semiconductor package by disposing a semiconductor element in the mold, and sealing it with the curable resin to form a resin sealed portion, comprising a first thermoplastic resin layer to be in contact with the curable resin at the time of forming the resin sealed portion, a second thermoplastic resin layer to be in contact with the mold at the time of forming the resin sealed portion, and an interlayer disposed between the first thermoplastic resin layer and the second thermoplastic resin layer, wherein the first thermoplastic resin layer and the second thermoplastic resin layer have a storage elastic modulus at 180° C. of from 10 to 300 MPa, respectively, the difference in storage elastic modulus at 25° C. between them is at most 1,200 MPa, and their thicknesses are from 12 to 50 μm, and the interlayer includes a layer containing a polymeric antistatic agent.
Abstract:
To provide a process for producing a package for mounting a semiconductor element by using a mold, said a package for mounting a semiconductor element comprising a substrate having a mounting surface for mounting a semiconductor element and a packaging body formed from a cured product of a curable resin and having a frame-shaped portion surrounding the mounting surface, and the package has a concave portion formed by the mounting surface and the packaging body, which allows it to prevent resin burrs without occurrence of dents or damage of a substrate and failure in releasing from a mold, and to provide a mold release film to be suitably used for the production process.A mold release film having a substantially constant thickness over the film, is disposed on the upper mold having a convex portion of which shape corresponds to the concave portion, the substrate is disposed on the lower portion, the upper mold and the lower mold are closed so as to be in close contact with the convex portion to the mounting portion of the substrate via the mold release film, a space formed between the upper mold and the lower mold is filled with a curable resin, followed by curing the curable resin, and the cured product is released together with the substrate, from the mold.
Abstract:
To provide a mold release film having excellent releasing properties for a sealed body from a mold and excellent followability to a mold requiring significant deformation, in a method for producing a sealed body wherein a structure comprising a substrate, a semiconductor element and connection terminals, is disposed in a mold requiring significant deformation and sealed with a curable resin to form a resin sealed portion having a thickness of at least 3 mm. The mold release film has a first layer to be in contact with the curable resin at the time of forming the resin sealed portion, and a second layer, wherein the first layer has a thickness of from 5 to 30 μm and is made of at least one member selected from the group consisting of a fluororesin and a polyolefin having a melting point of at least 200° C., and the second layer has a thickness of from 38 to 100 μm, a product of the tensile storage modulus (MPa) at 180° C. and the thickness (μm) being at most 18,000 (MPa·μm), and a product of the tensile stress at break (MPa) at 180° C. and the thickness (μm) being at least 2,000 (MPa·μm).
Abstract:
To provide an insulating tape for covering, in which a polyimide film and a fluorinated resin film are laminated with excellent adhesion, and a method for producing a structure, which comprises covering a conductor with such an insulating tape for covering, followed by thermal treatment. The insulating tape for covering, comprises a polyimide film and a fluorinated resin film directly laminated on one or both surfaces of the polyimide film, wherein the fluorinated resin film contains a fluorinated copolymer (A) which has a melting point of from 220 to 320° C. and can be melt-molded and which has at least one type of functional groups selected from the group consisting of carbonyl group-containing groups, hydroxy groups, epoxy groups and isocyanate groups.