Abstract: A film including a polyimide and an acrylic resin is disclosed. An in-plane average refractive index nH and a thickness direction refractive index n3 of the film satisfy nH?n3?0.0140, where the in-plane average refractive index nH is an average value of a refractive index n1 in a first direction in which refractive index in a film plane is maximum and a refractive index n2 in a second direction orthogonal to the first direction in the film plane. A total light transmittance of the film may be 85% or more, a haze of the film may be 10% or less, and a yellowness index of the film may be 5 or less. The film can be produced by, for example, stretching an unstretched film including a polyimide and an acrylic resin in at least one direction. The film may be a biaxially stretched film.

Abstract: The present invention relates to a transparent polyimide film containing a polyimide and a phosphate ester. The content of the phosphate ester based on 100 parts by mass of the polyimide is 3 parts by mass or more, preferably 5 to 100 parts by mass. It is preferable to use a phosphate ester that has a high birefringence reduction effect and with which a decrease in the tensile modulus of the film is small. In production of the polyimide film, it is preferable to employ a method in which: a solvent-soluble polyimide resin and a phosphate ester are dissolved in an organic solvent exhibiting solubility with respect to the polyimide resin to prepare a polyimide solution; the polyimide solution is applied onto a substrate; and the organic solvent is removed.

Abstract: A repair method is a repair method of a rotor including a rotor body extending in an axial direction about an axis and a plurality of impellers arranged in the axial direction and fixed to the rotor body, the repair method including: a step of performing welding on a repair area of the rotor body to fill a damaged portion with a welded portion; a step of performing heat treatment only on the repair area in the rotor after the welding is performed; and a step of scraping a part of the welded portion after the heat treatment is performed, to form a processing surface smoothly connected to an outer surface.

Abstract: A resin composition including a polyamideimide and an acryl-based resin is provided. The polyamideimide has a diamine-derived structure, a tetracarboxylic-dianhydride-derived structure and a dicarboxylic-acid-derived structure, and contains a structure derived from a fluoroalkyl-substituted benzidine as the diamine-derived structure. A ratio of the dicarboxylic-acid-derived structure relative to the total of the tetracarboxylic-dianhydride-derived structure and the dicarboxylic-acid-derived structure of the polyamideimide may be 5 to 80 mol %. The resin composition may be used for production of formed article such as film.

Abstract: A resin composition includes a polyimide and an acryl-based resin. The polyimide includes alicyclic tetracarboxylic dianhydride such as 1,2,3,4-cyclobutanetetracarboxylic dianhydride as a tetracarboxylic dianhydride component, and a diamine having a perfluoroalkyl group such as 2,2?-bis(trifluoromethyl)benzidine as a diamine component. An amount of the alicyclic tetracarboxylic dianhydride based on an amount of all tetracarboxylic dianhydride components in the polyimide is 1 to 80 mol %.

Abstract: [Problem] To provide a surface control agent for a water-based coating, the surface control agent having both cissing prevention properties and overcoatability when used for applications requiring excellent appearance and overcoatability. [Solution] The surface control agent for a water-based coating includes: a copolymer containing, as constituent monomers, a dibasic acid ester (A) having a polymerizable unsaturated double bond in an amount of 10% by mass or more and 99% by mass or less, and an ether group-containing polymerizable unsaturated monomer (B) having a (meth)acryloyl group, a vinyl ether group, or an allyl group in an amount of 1% by mass or more and 90% by mass or less, wherein the copolymer has a weight-average molecular weight of 1,000 or more and 100,000 or less.

Abstract: The present invention relates to a transparent polyimide film containing a polyimide and a phosphate ester. The content of the phosphate ester based on 100 parts by mass of the polyimide is 3 parts by mass or more, preferably 5 to 100 parts by mass. It is preferable to use a phosphate ester that has a high birefringence reduction effect and with which a decrease in the tensile modulus of the film is small. In production of the polyimide film, it is preferable to employ a method in which: a solvent-soluble polyimide resin and a phosphate ester are dissolved in an organic solvent exhibiting solubility with respect to the polyimide resin to prepare a polyimide solution; the polyimide solution is applied onto a substrate; and the organic solvent is removed.

Abstract: A resin composition contains a polyimide resin and an ester-based resin. The ester-based resin is polycarbonate or polyarylate. The polyimide contains a structural unit represented by general formula (1). In general formula (1), X is a divalent organic group shown in group (I), and Y is a divalent group that contains one or more selected from the group consisting of a fluorine group, a trifluoromethyl group, a sulfonic group, a fluorene structure and an alicyclic structure. Each of R1 and R2 is a fluorine atom, an alkyl group having 1 to 20 carbon atoms, or a fluoroalkyl group having 1 to 20 carbon atoms, m is an integer of 1 to 4, and n is an integer of 0 to 4.

Abstract: [Problem] To provide a surface control agent for a water-based coating, the surface control agent having both cissing prevention properties and overcoatability when used for applications requiring excellent appearance and overcoatability. [Solution] The surface control agent for a water-based coating includes: a copolymer containing, as constituent monomers, a dibasic acid ester (A) having a polymerizable unsaturated double bond in an amount of 10% by mass or more and 99% by mass or less, and an ether group-containing polymerizable unsaturated monomer (B) having a (meth)acryloyl group, a vinyl ether group, or an allyl group in an amount of 1% by mass or more and 90% by mass or less, wherein the copolymer has a weight-average molecular weight of 1,000 or more and 100,000 or less.

Abstract: A method for producing a positive electrode active material is provided. The method can prevent a gas generation due to an oxidative degradation of a non-aqueous electrolyte in a lithium-ion secondary battery using a positive electrode active material which operates at a high potential. A method for producing a coated positive electrode active material for a lithium-ion secondary battery includes coating a surface of a positive electrode active material with an oxide-based solid electrolyte by a mechanical coating method and then conducting heat treatment at 300° C. or higher, and the positive electrode active material has an average potential of extraction and insertion of lithium of 4.5V or more and 5.0V or less based on Li+/Li.

Abstract: A polyimide resin has an acid dianhydride-derived structure and a diamine-derived structure, the acid dianhydride contains an acid dianhydride represented by the general formula (1) and a fluorine-containing aromatic acid dianhydride, and the diamine contains a fluoroalkyl-substituted benzidine. In the general formula (1), n is an integer of 1 or more, and R1 to R4 are each independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, or a perfluoroalkyl group having 1 to 20 carbon atoms. The content of the acid dianhydride represented by the general formula (1) may be 10 to 65 mol %, and the content of the fluorine-containing aromatic acid dianhydride may be 30 to 80 mol %, based on 100 mol % of the total of the acid dianhydride.

Abstract: Provided is a novel layer migration control agent that is added to a paint composition when forming a multilayer coating film on a coating object by curing a prime coating film and a top coating film at the same time, the agent making it possible to control layer migration of the two coating films and obtain the multilayer coating film with satisfactory finish appearance. The layer migration control agent is a copolymer obtained by copolymerization of a monomer mixture including 5% by weight to 90% by weight of a polymerizable unsaturated monomer including an ether group and 10% by weight to 95% by weight of a polymerizable unsaturated monomer having a hydrophobic group having 1 to 22 carbon atoms, the copolymer having a weight average molecular weight of 1000 to 100,000.

Abstract: Provided is a novel layer migration control agent that is added to a paint composition when forming a multilayer coating film on a coating object by curing a prime coating film and a top coating film at the same time, the agent making it possible to control layer migration of the two coating films and obtain the multilayer coating film with satisfactory finish appearance. The layer migration control agent is a copolymer obtained by copolymerization of a monomer mixture including 5% by weight to 90% by weight of a polymerizable unsaturated monomer including an ether group and 10% by weight to 95% by weight of a polymerizable unsaturated monomer having a hydrophobic group having 1 to 22 carbon atoms, the copolymer having a weight average molecular weight of 1000 to 100,000.

Abstract: A collector for bipolar lithium ion secondary batteries comprises a first conductive layer that is obtained by adding a conductive filler to a base that contains an imide group-containing resin, and a second conductive layer that has a function of blocking lithium ions. The second conductive layer comprises a blocking resin layer that is obtained by adding a conductive filler to a base that contains a resin which contains no imide group, and a metal layer. This collector for bipolar lithium ion secondary batteries is used in such a manner that the first conductive layer is on the positive electrode active material layer side with respect to the second conductive layer.

Abstract: A collector for bipolar lithium ion secondary batteries including an electroconductive polyimide layer including a conductivity-imparting agent dispersed in a polyimide resin that is prepared by imidizing a polyamic acid that is obtained by reacting at least one tetracarboxylic dianhydride component of biphenyltetracarboxylic dianhydrides, 3,3?,4,4?-benzophenonetetracarboxylic dianhydride, pyromellitic dianhydride, and [isopropylidenebis(p-phenyleneoxy)]diphthalic dianhydrides with at least one diamine component of oxydianilines, phenylenediamines, and 2,2-bis[4-(4-aminophenoxy)phenyl]propane has excellent solvent barrier properties to an electrolytic solution, and can be used to give a highly reliable bipolar lithium ion secondary battery.

Abstract: A conductive polyimide film having an excellent film strength and electrical properties can be manufactured in a high productivity by a method for manufacturing conductive polyimide film which includes, in a manufacture method of a conductive polyimide film including an agent for imparting conductivity and a polyimide resin, drying a coating film including (A) and (B); and subjecting the film to imidation. (A) A polyamic acid including 3,3?,4,4?-biphenyltetracarboxylic acid dianhydride, 4,4?-oxydianiline, and 3,3?,4,4?-benzophenonetetracarboxylic acid dianhydride and/or p-phenylenediamine, which is obtained by reacting a tetracarboxylic acid dianhydride with a diamine compound. (B) A agent for imparting conductivity. (C) An imidation accelerator including a dialkylpyridine, and 0.1 to 1.6 molar equivalents of acetic anhydride per mol of an amic acid in a polyamic acid.

Abstract: Provided is a curable composition excellent in curability and mechanical properties as well as a cured product thereof. Specially provided is a curable composition containing a vinyl-based polymer (I) having one or more crosslinkable functional groups at a terminus on average and a nucleophilic agent (II) and a cured product obtained by curing the curable composition. Preferably, the curable composition of the invention further contains an epoxy resin (III).

Abstract: Provided is a curable composition excellent in curability and mechanical properties as well as a cured product thereof. Specially provided is a curable composition containing a vinyl-based polymer (I) having one or more crosslinkable functional groups at a terminus on average and a nucleophilic agent (II) and a cured product obtained by curing the curable composition. Preferably, the curable composition of the invention further contains an epoxy resin (III).

Abstract: Disclosed is a curable composition having low viscosity, which is capable of forming a cured product that is excellent in heat resistance, weather resistance, oil resistance and the like, while having rubber elasticity. Specifically disclosed is a curable composition for both thermal radical curing and latent thermal curing with epoxy essentially containing the following components (A) and (B). (A) a vinyl-based polymer having two or more groups represented by the general formula (1): —OC(O)C(Ra)?CH2??(1) wherein Ra represents a hydrogen atom or an organic group having 1 to 20 carbon atoms, per molecule, and having one or more groups represented by the above general formula (1) at a molecular terminal; (B) an epoxy compound.

Abstract: Disclosed is a curable composition having excellent curability, which is capable of forming a cured product that is excellent in heat resistance, weather resistance, oil resistance and the like, while having rubber elasticity and high mechanical strength. Specifically disclosed is a curable composition for both photoradical and thermal radical curing essentially containing the following components (A), (B), and (C). (A) a vinyl-based polymer having two or more groups represented by the general formula (1): —OC(O)C(Ra)?CH2??(1) wherein Ra represents a hydrogen atom or an organic group having 1 to 20 carbon atoms, per molecule, and having one or more groups represented by the above general formula (1) at a molecular terminal; (B) a photoradical initiator; and (C) a thermal radical initiator, as essential components.