Abstract: There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 4.9 to 7.0% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 0.5 to 1.5 g/10 min, and the number of functional groups of 20 or less per 106 main-chain carbon atoms.

Abstract: There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 4.8 to 6.2% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 17.0 to 23.0 g/10 min, and the number of functional groups of 50 or less per 106 main-chain carbon atoms.

Abstract: Provided is a pipe joint including a cylindrical hollow, wherein the wall thickness of a part having the largest wall thickness of the pipe joint is 2 to 7 mm, the ratio of the length of the hollow in the axial direction (L) to the diameter of the hollow (D), (L/D), is 5 or less, the pipe joint contains a copolymer containing tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit, the content of the fluoro(alkyl vinyl ether) unit of the copolymer is 2.8 to 6.0% by mass with respect to the whole of the monomer units, the melt flow rate at 372° C. of the copolymer is 4.0 g/10 min or higher and lower than 11.0 g/10 min, and the number of functional groups of the copolymer is 50 or less.

Abstract: Provided is an injection molded article including a bottom surface section, and a side surface section erected from a peripheral edge of the bottom surface section, wherein the height from the bottom surface section of the side surface section is 3.8 cm or larger, the ratio of the height from the bottom surface section of the side surface section to the average thickness of the side surface section (height/thickness) is 19.0 or more, the load applied to the lower end section of the side surface section is 0.8 kPa or higher, the injection molded article contains a copolymer containing tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit, the content of the fluoro(alkyl vinyl ether) unit of the copolymer is 4.5 to 6.0% by mass with respect to the whole of the monomer units, the melt flow rate at 372° C. of the copolymer is 35.0 to 60.0 g/10 min, and the number of functional groups of the copolymer is 50 or less.

Abstract: There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 4.4 to 6.0% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 7.5 to 11.0 g/10 min, and the number of functional groups of 40 or less per 106 main-chain carbon atoms.

Abstract: Provided is an injection molded article including a pipe body section forming a flow path of a fluid, and a flange section formed on one end or both ends of the pipe body section, wherein the maximum thickness of the flange section is 2 to 12 mm, the injection molded article contains a copolymer containing tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit, the content of the fluoro(alkyl vinyl ether) unit of the copolymer is 2.8 to 6.0% by mass with respect to the whole of the monomer units, the melt flow rate at 372° C. of the copolymer is 4.0 g/10 min or higher and lower than 11.0 g/10 min, and the number of functional groups of the copolymer is 50 or less.

Abstract: Provided is a coated electric wire having a core wire, and a coating layer installed on the periphery of the core wire, wherein the coating layer contains a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, the content of perfluoro(propyl vinyl ether) unit in the copolymer is 4.8 to 5.5% by mass with respect to the whole of the monomer units, the melt flow rate at 372° C. of the copolymer is 28.0 to 37.0 g/10 min, and the number of functional groups of the copolymer is 50 or less per 106 main-chain carbon atoms.

Abstract: Provided an injection molded article obtained by injection molding a copolymer using a mold provided with a gate, wherein the copolymer contains tetrafluoroethylene (TFE) unit and a fluoro(alkyl vinyl ether) (PAVE) unit, the content of the fluoro(alkyl vinyl ether) unit of the copolymer is 3.5 to 4.7% by mass with respect to the whole of the monomer units, the melt flow rate at 372° C. of the copolymer is 22.0 to 35.0 g/10 min, the number of functional groups of the copolymer is 20 or less per 106 main-chain carbon atoms, and the injection molded article has a gate section corresponding to the gate of the mold, and the ratio of the maximum flow length from the gate section of the injection molded article (a) to the average value of the product thickness on the maximum flow length (b), ((a)/(b)), is 80 to 200.

Abstract: Provided is an injection molded article containing a copolymer containing tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit, wherein the content of the fluoro(alkyl vinyl ether) unit of the copolymer is 3.9 to 4.8% by mass with respect to the whole of the monomer units, the melt flow rate at 372° C. of the copolymer is 11.0 to 19.0 g/10 min, the melting point of the copolymer is 296 to 305° C., and the amount of fluorine ions dissolving out from the injection molded article into water is 7,500 ?g/m2 or lower.

Abstract: There is provided a copolymer containing tetrafluoroethylene unit and perfluoro(propyl vinyl ether) unit, wherein the copolymer has a content of perfluoro(propyl vinyl ether) unit of 2.7 to 4.9% by mass with respect to the whole of the monomer units, a melt flow rate at 372° C. of 0.7 to 1.4 g/10 min, and the number of functional groups of 20 or less per 106 main-chain carbon atoms.

Abstract: A built-in component board includes a first insulating layer; wiring layer and a metal pad layer that are formed on the first insulating layer; a second insulating layer that is formed on the wiring layer and the metal pad layer; and a cavity that is formed on the second insulating layer and that exposes the metal pad layer. Furthermore, the built-in component board includes an electronic component that is mounted on the metal pad layer; and a filling layer that is filled in the cavity and that buries the electronic component. Furthermore, a metal used for the metal pad layer includes a metal having thermal conductivity that is lower than that of a metal used for the wiring layer.

Abstract: A magnet wire including a conductor and an insulating coating formed on an outer periphery of the conductor. The insulating coating contains a copolymer containing a tetrafluoroethylene unit and a fluoroalkyl vinyl ether unit. The copolymer has a melt flow rate of 10 to 60 g/10 min, and the copolymer has a fluoroalkyl vinyl ether unit content of 6.2 to 8.0% by mass based on a total content of monomer units.

Abstract: A tank closing structure includes a tank body configured to store a liquid, a lid member that closes an opening formed in the tank body and has a liquid swelling property, and a holding ring that holds a flange portion of the lid member on the tank body. The tank closing structure further includes a deformation promoting portion for promoting deformation in which a radially central portion of the lid member is recessed inward of the tank body in response to the swelling of the lid member.

Abstract: A wiring substrate includes a first insulation layer, a second insulation layer formed on an upper surface of the first insulation layer, an opening extending through the second insulation layer, an adhesive layer formed on a bottom surface in the opening, an electronic component fixed in the opening by the adhesive layer, a filling insulation layer covering an upper surface of the second insulation layer and filling the opening to cover the electronic component, and a wiring layer formed on an upper surface of the filling insulation layer. The adhesive layer includes a base portion covering a lower surface of the electronic component in tight contact and a cover portion covering a side surface of the electronic component in tight contact. The cover portion has a lower filler content ratio than the base portion. The filling insulation layer covers a side surface of the cover portion in tight contact.

Abstract: A wiring substrate includes a first insulation layer, a second insulation layer formed on an upper surface of the first insulation layer, an opening extending through the second insulation layer, an adhesive layer formed on a bottom surface in the opening, an electronic component fixed in the opening by the adhesive layer, a filling insulation layer covering an upper surface of the second insulation layer and filling the opening to cover the electronic component, and a wiring layer formed on an upper surface of the filling insulation layer. The adhesive layer includes a base portion covering a lower surface of the electronic component in tight contact and a cover portion covering a side surface of the electronic component in tight contact. The cover portion has a lower filler content ratio than the base portion. The filling insulation layer covers a side surface of the cover portion in tight contact.

Abstract: The invention provides a molded article having excellent mechanical strength, heat resistance, surface roughness, and ferroelectricity. The molded article contains a crystal of a vinylidene fluoride/tetrafluoroethylene copolymer. The crystal is a ? crystal and is a nano-oriented crystal that has a size of 100 nm or smaller. The molded article has an arithmetic average roughness of 3.0 ?m or lower.

Abstract: A wiring board includes: a Cu pad; an insulating layer covering the Cu pad and having an opening portion; a first metallic layer formed on the Cu pad in the opening portion; and a connecting terminal formed on the first metallic layer to extend from the opening portion to above an upper surface of the insulating layer. The connecting terminal includes: a seed layer formed on the first metallic layer; and a second metallic layer formed on the seed layer. A stacked body is formed of the first metallic layer and the connecting terminal and includes a constricted portion. The constricted portion is located in a certain position of the first metallic layer in a thickness direction of the first metallic layer, and a sectional area of the stacked body is the smallest at the constricted portion.

Abstract: A wiring board includes: a Cu pad; an insulating layer covering the Cu pad and having an opening portion; a first metallic layer formed on the Cu pad in the opening portion; and a connecting terminal formed on the first metallic layer to extend from the opening portion to above an upper surface of the insulating layer. The connecting terminal includes: a seed layer formed on the first metallic layer; and a second metallic layer formed on the seed layer. A stacked body is formed of the first metallic layer and the connecting terminal and includes a constricted portion. The constricted portion is located in a certain position of the first metallic layer in a thickness direction of the first metallic layer, and a sectional area of the stacked body is the smallest at the constricted portion.

Abstract: The present invention aims to provide a laminate in which a metal and a fluoropolymer are directly and firmly attached to each other. The present invention relates to a laminate including a layer (A) including a metal, and a layer (B) formed on the layer (A), wherein the layer (B) includes a copolymer containing a polymer unit based on tetrafluoroethylene and a polymer unit based on a perfluoro(alkyl vinyl ether), the copolymer contains a carboxyl group at a terminus of a main chain and has a melt flow rate of not lower than 20 g/10 min and a melting point of not higher than 295° C., and the metal is at least one selected from the group consisting of copper, stainless steel, aluminum, iron, and an alloy thereof.

Abstract: A fluorocopolymer having a tetrafluoroethylene-derived constituent unit as essential unit, and hexafluoropropylene-derived constituent unit and/or perfluoro(alkyl vinyl ether)-derived constituent unit, wherein, when the fluorocopolymer is molded into a film, the film has not more than 10000 fisheyes capable of enclosing a square with a side length of 44 ?m and incapable of enclosing a square with a side length of 178 ?m per 100 g and not more than 1000 fisheyes capable of enclosing a square with a side length of 178 ?m per 100 g.