Abstract: The present invention provides a polyfunctional phenolic resin and a polyfunctional epoxy resin having low viscosity and having excellent mechanical properties and heat resistance of a cured product to be obtained, a curable resin composition containing these, and a cured product thereof. Specifically, provided are a polyfunctional phenolic resin formed with a naphthol structure optionally having a substituent on an aromatic ring and a catechol structure optionally having a methyl group as a substituent on an aromatic ring bonded together via a methylene group optionally having a substituent, a polyfunctional epoxy resin obtained by epoxidizing the polyfunctional phenolic resin, a curable resin composition containing any of these, and a cured product thereof.

Abstract: In metalworking, the amount of sulfur supplied is stabilized in wide temperature and pressure ranges and under an external force, such as a shear force. Thus, a stable iron sulfide film can be formed on the metal surface, and lubricity can be maintained for extended periods. Furthermore, a bulky sulfurized fat or oil with a high molecular weight can be used to form a rigid lubricating oil film with a large oil film thickness on the metal surface and thereby prevent metals from approaching each other. A sulfur-based extreme-pressure agent containing a polysulfide (a) and a sulfurized fat or oil (b) at a mass ratio in the range of 1:0.1 to 1:10. A metalworking fluid containing the sulfur-based lubricating oil composition is also related to.

Abstract: There is provided a method for producing a metal-resin composite including a metal member and a resin member which are joined together, the resin member containing at least a thermoplastic resin. The method includes a step of joining together the resin member and the metal member by melting the resin member with the frictional heat generated in the surface of the metal member on its side opposite to the resin member in a state where the metal member and the resin member are superposed. The melting point of the thermoplastic resin is 260° C. or more.

Abstract: Provided is an ink film recovery method including detaching and removing, from a plastic substrate having an ink film, the ink film by using an ink cleaning agent containing water and at least one selected from an amphoteric surfactant and a cationic surfactant, and then recovering the detached ink film, an ink cleaning agent that can be applied to this ink film recovery method, and an ink film detaching method. Ink films printed on plastic substrates can be easily detached and the detached ink films can be easily recovered using an ink cleaning agent that contains water and at least one selected from an amphoteric surfactant and a cationic surfactant.

Abstract: A polyarylene sulfide (PAS) resin composition that contains a PAS resin and an antiviral agent, has superior antibacterial and antiviral properties, and maintains its intrinsic mechanical strength, weld strength in particular, an article molded from this resin composition, and methods for producing them are provided. More specifically, the PAS resin composition is one that contains the PAS resin and antivirus agent as its essential components, the molded article is one molded from it, and the production methods, for the PAS resin composition and the molded article, are one that includes a step of melt-kneading the PAS resin and antiviral agent in a temperature range of equal to or higher than the melting point of the PAS resin and one in which the PAS resin composition is melted and molded. The antiviral agent is metal ion-containing phosphate and/or borate glass.

Abstract: An adhesive tape including an adhesive layer is provided. The adhesive layer has a biobased content of 50% or more by mass. The adhesive layer contains a reaction product of a urethane resin (A) and a cross-linking agent (B). The urethane resin (A) contains at least a structural unit derived from a biobased polyether polyol and a structural unit derived from an aromatic polyisocyanate. The adhesive layer has a gel fraction of 10% or more by mass and 80% or less by mass and a stress of less than 50 N/cm2 at 100% strain in a stress-strain curve.

Abstract: The compound is represented by general formula (i). In the compound, in a group Ki1, at least two secondary carbon atoms in an alkyl group (a linear alkyl, halogenated alkyl, or cyanogenated alkyl group having 3 to 40 carbon atoms) are replaced with —C(?Xi1)— and/or —CH(—CN)—, where Xi1 is an oxygen atom, a sulfur atom, NH, or NR13; in addition, a group Ai2, a group Ai3, or the group Ki1 includes, as a substituent, at least one Pi1-Spi1- group, where Pi1 is a polymerizable group, and SPi1 is a spacer group or a single bond. The liquid crystal composition including the compound represented by general formula (i) can be adsorbed onto substrates between which a liquid crystal layer is held, and, consequently, without the use of an alignment film, liquid crystal molecules can be maintained in a state in which the liquid crystal molecules are aligned in a vertical direction.

Abstract: Provided is a prepreg resin composition, containing: a urethane (meth)acrylate (A) that is a reaction product of polyisocyanate (a1), polyol (a2), and hydroxy alkyl (meth)acrylate (a3); a polymerization initiator (B); and a thermoplastic resin (C), as an essential component, in which the polyisocyanate (a1) is at least one polyisocyanate selected from 2,4?-diphenyl methane diisocyanate, 4,4?-diphenyl methane diisocyanate, a carbodiimide modified product of 4,4?-diphenyl methane diisocyanate, and polymethylene polyphenyl polyisocyanate. The prepreg resin composition of the invention is excellent in molding properties, and is capable of forming a molded article excellent in various physical properties such as flexibility, impact resistance, and heat resistance, and thus, can be preferably used in a prepreg and a molded article thereof.

Abstract: The invention provides an epoxy compound A represented by the following formula (1): in the formula (1), Ar's each independently represent a structure having an unsubstituted or substituted aromatic ring; R1 and R2 each independently represent a hydrogen atom or an alkyl group having 1 or 2 carbon atoms; R3 to R8 represent a hydroxy group, a glycidyl ether group and/or a 2-methylglycidyl ether group, and at least one of R3 to R8 is a glycidyl ether group or a 2-methylglycidyl ether group; R9 to R12 represent a hydroxy group or a methyl group; n is an integer of 11 to 16; and m, p1, p2, and q are average values of repetition, m is 0.5 to 10, p1 and p2 are each independently 0 to 5, and q is 0.5 to 5 (provided that each repeating unit present in the repeating units may be the same or different).

Abstract: To calculate the properties of a resin composition in a short time and with high accuracy, a resin property value prediction apparatus includes an acquisition unit acquiring spectral data obtained by measuring a resin composition by a spectroscopic sensor in a process of performing a resin polymerization reaction in a batch type reaction tank and a calculation unit, using a learned model learned with spectral data obtained by measuring the resin composition in advance and a resin property value as training data, calculating the resin property value of the resin composition having the spectral data acquired by the acquisition unit.

Abstract: The halogenated zinc phthalocyanine pigment is for use as a green pigment for color filters and capable of achieving high brightness. In the halogenated zinc phthalocyanine pigment, when a coating film containing 1.00 part by mass of the pigment, 0.95 parts by mass of a benzyl methacrylate-methacrylic acid copolymer, and 0.30 parts by mass of a dimethylaminoethyl methacrylate copolymer is heated at 230° C. for one hour to form an evaluation coating film having a thickness of 4 ?m, an average scattering intensity at scattering angles 2? in a range of 17° to 21° is determined from a two-dimensional scattering image obtained by GI-WAXS measurement of the evaluation coating film, and a normalized average scattering intensity is determined such that the average scattering intensity at an azimuth of 45° is 1, the normalized average scattering intensity at azimuths of 5° to 89° is 0.70 to 1.15.

Abstract: Provided are a molded article that contains a polyarylene sulfide (PAS) resin and a glass fiber and allows a decrease in mechanical strength to be suppressed even in a hot water environment and under acidic conditions, a PAS resin composition capable of providing such a molded article, and methods for producing the same. More specifically, provided are a PAS resin composition including, per 100 parts by mass of a PAS resin, 10 to 100 parts by mass of a glass fiber having, in the glass fiber, a ZrO2 content of 16 mass % or more, a TiO2 content of 5 to 10 mass % or less, and a CaO content of 0.1 to 5 mass %, and 0.01 to 10 parts by mass of a silane coupling agent (C) blended as essential components; a molded article; and methods for producing the same.

Abstract: The disclosure provides a liquid crystal device including a liquid crystal composition containing a dichroic dye (dye-containing liquid crystal composition) that is in a light transmissive state when no voltage is applied to the transparent electrode and in a light scattering state when voltage is applied. The liquid crystal composition exhibits a negative dielectric constant anisotropy. The haze value of the liquid crystal device is 10% or less when no voltage is applied at 25° C., and the haze value is 50% or more when a rectangular wave voltage (AC 50 V, 60 Hz) is applied. The voltage holding ratio of the dye-containing liquid crystal composition is 60% or less at 25° C. The liquid crystal device provided by the disclosure is used as a component to provide a liquid crystal display apparatus, a light control apparatus, or a light transmitting apparatus with a high contrast.

Abstract: A sealant film is provided in which a surface resin layer (A), an adhesive resin layer (B), a release resin layer (C), and a heat seal resin layer (D) are laminated. The adhesive resin layer (B) contains a thermoplastic elastomer (b1) and a tackifier resin (b2). The release resin layer (C) contains 40% by mass or more of an ethylene ionomer (c1) with a polar group concentration exceeding 5.5 mol % in a resin component contained in the release resin layer (C). The release resin layer (C) further contains 0 to 60% by mass of an ethylene ionomer (c2) with a polar group concentration of 5.5 mol % or less in the resin component contained in the release resin layer (C). The heat seal resin layer (D) contains an ethylene resin (d1).

Abstract: Provided are a molded article that contains a polyarylene sulfide (PAS) resin and a glass fiber and allows a decrease in mechanical strength to be suppressed even in a hot water environment and under acidic conditions, a PAS resin composition capable of providing such a molded article, and methods for producing the same. More specifically, provided are a PAS resin composition including, per 100 parts by mass of a PAS resin, 10 to 100 parts by mass of a glass fiber having, in the glass fiber, an MgO content of 6 mass % or more, a CaO content of 16 mass % or less, and an R2O content (the R2O content representing the total content of LiO2, Na2O, and K2O) of 1 mass % or less, and 0.01 to 10 parts by mass of a silane coupling agent (C) blended as essential components; a molded article; and methods for producing the same.

Abstract: Provided is a method for manufacturing a molded article obtained by double belt press molding a thermosetting prepreg, in which the thermosetting prepreg is coated with a release film during molding, and a width of the prepreg is 1 to 25 mm smaller than that of the release film. This manufacturing method suppresses burr generation and fiber twisting, and is excellent in width restriction, and thus can be suitably used for, for example, automobile members, railroad vehicle members, aerospace machine members, ship members, household equipment members, sporting goods members, light vehicle members, building and civil engineering members, and housings for OA equipment and the like.

Abstract: The present invention provides a urethane resin composition including an anionic urethane resin (X) and water (Y), in which the anionic urethane resin (X) is produced using, as raw materials, a polycarbonate polyol (A-1) produced using biomass-derived decanediol as a raw material, and a polycarbonate polyol (A-2) produced using a biomass-derived dihydroxy compound having a cyclic ether structure as a raw material. The polycarbonate polyol (A-1) is preferably produced further using butanediol as a raw material. In the polycarbonate polyol (A-1), the molar ratio [(C4)/(C10)] of the butanediol (C4) to the biomass-derived decanediol (C10) is preferably within a range of 50/50 to 98/2.

Abstract: Provided is a method for producing a sheet molding compound, including a step of measuring bulkiness of a carbon fiber aggregate before an impregnation step of impregnating the carbon fiber aggregate with a resin composition. The method for producing a sheet molding compound can produce a sheet molding compound having the excellent impregnation property into carbon fibers regardless of the content of the carbon fibers, and thus can be preferably used for exteriors, structures, and the like of an automotive member, a railroad vehicle member, an aerospace vehicle member, a ship member, a housing equipment member, a sport member, a light vehicle member, a civil engineering and construction member, an OA equipment, etc.

Abstract: An object is to provide a cured product having excellent heat resistance and dielectric properties (low dielectric properties) and prepregs, circuit boards, build-up films, semiconductor sealing materials, and semiconductor devices having these pieces of performance by using a curable resin having a specific structure. Specifically, provided is a curable resin having a structural unit (1) represented by General Formula (1) below and a terminal structure (2) represented by General Formula (2) below. In Formulae (1) and (2) above, the details of R1, R2, R3, k, and X are as described herein.

Abstract: Provided are a solvent-free two-component type adhesive capable of guaranteeing a practical packaging property, with an excellent curing property and significantly shortening aging time, a laminated film using the same, and a polyol composition for an adhesive. An adhesive, characterized in comprising a polyisocyanate composition (X) containing a polyisocyanate (A), and a polyol composition (Y) containing a polyol (C) and a tertiary amine compound (B) having multiple hydroxyl groups, as necessary components.