Abstract:
To provide a prepreg excellent in storage stability and capable of obtaining a fiber-reinforced molded product excellent in impact resistance, and a method for its production, as well as a fiber-reinforced molded product excellent in impact resistance. The prepreg comprises reinforcing fibers and a matrix resin, wherein the matrix resin comprises a thermoplastic resin (but excluding the following fluororesin) and a melt-formable fluororesin having a melting point of from 100 to 325° C. and having functional groups of at least one type selected from the group consisting of carbonyl group-containing groups, hydroxy groups, epoxy groups and isocyanate groups, and in 100 mass % of the total of the thermoplastic resin and the fluororesin, the proportion of the thermoplastic resin is from more than 30 to 99 mass % and the proportion of the fluororesin is from 1 to less than 70 mass %.
Abstract:
To provide a prepreg excellent in storage stability and capable of obtaining a fiber-reinforced molded product excellent in impact resistance, chemical resistance and inter-member (interlayer) adhesion and a method for its production as well as a fiber-reinforced molded product excellent in impact resistance, chemical resistance and inter-member (interlayer) adhesion. The prepreg comprises reinforcing fibers and a matrix resin, wherein the matrix resin comprises, as a resin component, only a melt-moldable fluororesin having a melting point of from 100 to 325° C. and having functional groups of at least one type selected from the group consisting of carbonyl group-containing groups, hydroxy groups, epoxy groups and isocyanate groups, or the fluororesin and a thermoplastic resin (but excluding the fluororesin), and in 100 mass % of the total of the fluororesin and the thermoplastic resin, the proportion of the fluororesin is from 70 to 100 mass % and the proportion of the thermoplastic resin is from 0 to 30 mass %.
Abstract:
To provide a fluorinated copolymer composition which is excellent in physical properties such as abrasion resistance, etc. and which is suitable for use as e.g. an electric wire-coating material; a molded product; and an electric wire. The fluorinated copolymer composition comprises fluorinated copolymer (A) comprising constituent units (a) derived from tetrafluoroethylene, constituent units (b) derived from a fluorinated monomer (provided that tetrafluoroethylene is excluded), and constituent units (c) derived from a monomer having an acid anhydride residue and no fluorine atom, in a specific ratio, and thermoplastic resin (B) having a Rockwell hardness of at least M60 and an insulation performance as defined by ASTM D-257 of at least 1015 Ω·cm in a volume ratio of (A)/(B)=from 99/1 to 55/45. The molded product and the electric wire are ones prepared by using such a fluorinated copolymer composition.
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 an insulated electric wire having an insulating layer comprising PFA, which is excellent in the abrasion resistance without increasing the thickness of the insulating layer. An insulated electric wire comprising a conductor and an insulating layer covering the conductor, wherein the insulating layer comprises a fluorinated copolymer (A) having units based on tetrafluoroethylene and units based on a perfluoroalkyl vinyl ether, the content of the units based on a perfluoroalkyl vinyl ether is from 0.1 to 1.9 mol % to the total units in the fluorinated copolymer (A); MRF of the fluorinated copolymer (A) as measured by the method in accordance with ASTM D-3307 is at least 0.1 and less than 15; the melting point of the fluorinated copolymer (A) is at least 260° C.; and the ratio of the thickness Di of the insulating layer to the diameter Dc of the conductor (Di/Dc) is less than 0.5.
Abstract:
To provide a production method capable of improving the abrasion resistance of an electric wire or molded article using a fluororesin, by electron beam irradiation in air at a temperature where the fluororesin does not melt, and a method for producing a resin material containing a modified fluororesin whereby an electric wire or a molded article excellent in abrasion resistance can be obtained. A method for producing an electric wire, which comprises a step of irradiating an electron beam to an insulating layer containing a fluororesin and covering a conductor, to form an insulating layer containing a modified fluororesin, characterized in that the fluororesin has a crystalline melting point of at least 260° C., contains either one or both of a structural unit (a) having a carbonyl group-containing group and a main chain terminal group (a′) having a carbonyl group-containing group, and a structural unit (b) based on a perfluoromonomer and does not contain a structural unit based on a hydrocarbon monomer (but excluding the structural unit (a)), and irradiation of the electron beam is conducted under conditions of a temperature of less than the crystalline melting point of the fluororesin and in air, to satisfy at least one of the following (1) to (3): 0.5≦Mb/Ma