Abstract: At least a surface of a reel pallet is made of resin. When a distance in a first direction between a reel supported by a first reel support and a reel supported by a second reel support is denoted by La, a distance in the first direction between an outer edge of the reel supported by the second reel support and a fourth side of an arrangement surface is denoted by Lb1, and a distance in the first direction between an end surface of the reel supported by the first reel support and a second side of the arrangement surface is denoted by Lb2, the reel pallet satisfies a relationship of 1<La/(Lb1+Lb2)<3.

Abstract: An insulated wire comprising a conductor and an insulating layer covering the conductor, wherein: the insulating layer comprises a resin and a first filler; the resin comprises a polyimide; the first filler is present in the form of a primary particle or a secondary particle having a plurality of the primary particles aggregated; the primary particle is a silica or alumina particle; the secondary particle has a particle diameter of 0.03 ?m or more and 5 ?m or less; and the percentage of the total area of the secondary particles to the sum of the total area of the primary particles and the total area of the secondary particles in the cross section of the insulated wire is 50% or more.

Abstract: A resin composition includes a phenoxy resin as a principal component. The phenoxy resin has a weight-average molecular weight of 40,000 or more. The phenoxy resin has, in the same or different molecules, a first structural unit derived from bisphenol S phenoxy and a second structural unit derived from a bisphenol epoxy other than the bisphenol S phenoxy. A content ratio of the first structural unit in the phenoxy resin is 20 mol% to 80 mol% relative to a total content of the first structural unit and the second structural unit constituting the phenoxy resin.

Abstract: The resin composition according to one aspect is a resin composition containing a polyamic acid and a solvent, wherein the polyamic acid has a repeating unit represented by the following general formula (1) in a molecular chain, and the molecular chain has a structure represented by the following general formula (2) at one end or both ends. The proportion of the structure represented by the following general formula (2) relative to 1 mol of the repeating unit represented by the following general formula (1) is 0.001 mol or more and 0.1 mol or less. In the following general formulas, R1 is a tetravalent organic group; R2 is a divalent organic group; and R3 is an organic group having 15 or less carbon atoms.

Abstract: An insulated electrical cable includes: a conductor; and an insulating layer that is laminated on an outer peripheral surface of the conductor and includes a polyimide as a main component, wherein the insulating layer includes a plurality of pores, and wherein a porosity of the insulating layer is greater than or equal to 25% by volume and less than or equal to 60% by volume.

Abstract: A method for producing an insulated electric wire includes a step of preparing a conductor having a linear shape; a step of forming an insulating coating so as to cover a surface on an outer peripheral side of the conductor to obtain an insulated electric wire that includes the conductor and the insulating coating covering the conductor; and a step of measuring a first electrostatic capacity between the insulated electric wire and a first electrode disposed outside in a radial direction of the insulated electric wire so as to face an outer peripheral surface of the insulated electric wire while transporting the insulated electric wire in a longitudinal direction of the conductor, and inspecting a formation state of the insulating coating, the formation state including a formation state of a defective portion in the insulating coating, on the basis of a change in the first electrostatic capacity.

Abstract: An insulated electric wire includes a linear conductor and one or a plurality of insulating layers formed on an outer peripheral surface of the conductor. At least one of the one or plurality of insulating layers contains a plurality of pores, outer shells are disposed on peripheries of the pores, and the outer shells are derived from shells of hollow-forming particles having a core-shell structure. A varnish for forming an insulating layer contains a resin composition forming a matrix and hollow-forming particles having a core-shell structure and dispersed in the resin composition. In the varnish, cores of the hollow-forming particles contain a thermally decomposable resin as a main component, and shells of the hollow-forming particles contain a main component having a higher thermal decomposition temperature than the thermally decomposable resin.

Abstract: An insulated electric wire includes a conductor that has a linear shape and an insulating film that is formed to cover the periphery of the conductor. The insulating film is formed of a polyimide that has a molecular structure including a PMDA-ODA-type repeating unit A and a BPDA-ODA-type repeating unit B, the mole ratio [B/(A+B)]×100 (% by mole) of the number of moles of the repeating unit B to the total number of moles of the repeating unit A and the repeating unit B being more than 55% by mole. A first sample of the insulating film with a separation elongation of 7% has a ratio M60/M10 of 1.2 or more, or a second sample of the insulating film with a separation elongation of 40% has a ratio M30/M10 of 1.2 or more.

Abstract: An insulated wire according to one embodiment of the present invention includes a linear conductor, and one or a plurality of insulating layers that are laminated on an outer peripheral surface of the conductor, wherein at least one layer of the one or plurality of insulating layers includes a plurality of pores, and a closed porosity within the plurality of pores is 80% by volume or higher.

Abstract: An insulated electric wire includes a linear conductor and one or more of insulating layers formed on an outer peripheral surface of the conductor. In the insulated electric wire, at least one of the one or more of insulating layers has a plurality of pores, outer shells are disposed on peripheries of the pores, and each of the outer shells has a plurality of projections on an outer surface thereof.

Abstract: An insulating varnish forms an insulating coating film having a shape that corresponds to the shape of an opening of a die, having a uniform thickness. The insulating varnish is applied onto a surface of a conductor, subsequently passes through a die to remove the excess applied insulating varnish, and is then dried or baked to form an insulating coating film on the surface of the conductor. The insulating varnish has a viscosity of 10 Pa·s or more measured by a B-type viscometer at 30° C. The insulating varnish preferably contains no filler, and is preferably a polyimide precursor solution. Since the insulating varnish has a high viscosity, baking and solidification can be performed while maintaining a shape formed when the insulating varnish passes through a die.

Abstract: An insulating varnish forms an insulating coating film having a shape that corresponds to the shape of an opening of a die, having a uniform thickness. The insulating varnish is applied onto a surface of a conductor, subsequently passes through a die to remove the excess applied insulating varnish, and is then dried or baked to form an insulating coating film on the surface of the conductor. The insulating varnish has a viscosity of 10 Pa·s or more measured by a B-type viscometer at 30° C. The insulating varnish preferably contains no filler, and is preferably a polyimide precursor solution. Since the insulating varnish has a high viscosity, baking and solidification can be performed while maintaining a shape formed when the insulating varnish passes through a die.

Abstract: Provided is an insulated wire that can realize a high corona inception voltage and that can satisfy required properties such as heat resistance and a mechanical strength. A polyimide resin varnish containing, as a main component, a polyimide precursor resin obtained by allowing an aromatic diamine to react with an aromatic tetracarboxylic dianhydride, wherein the aromatic diamine includes a first aromatic diamine having an aromatic ether bond and three or more benzene rings, and a second aromatic diamine represented by formula (2) below, and an imide group concentration after imidization of the polyimide precursor resin is 25% or more and 35% or less. (In the formula, R represents CH2 or O.