Abstract: A copolymer composition capable of providing a film or the like having good molding processability and excellent flex resistance, and a method for producing the same are provided. Further, a molded product, a film, a sheet, and a fiber using the copolymer composition are provided. A copolymer composition containing a copolymer (A) having a constitutional unit (a1) derived from 1,1-dicyanoethylene and a constitutional unit (a2) derived from a compound represented by general formula (I) below, in which a weight reduction rate is 5.

Abstract: Disclosed is a grain-finished leather-like sheet including: a fiber substrate; and a resin layer stacked on one side of the fiber substrate, wherein the resin layer includes at least a skin layer, and the skin layer includes a polyurethane, a nonionic compound having an HLB value of 10 to 16, and a water-soluble polymer, and has surface free energy including a polar component of 25 to 40 mJ/m2 and a dispersive component of 30 to 40 mJ/m2, as analyzed according to the OWRK method.

Abstract: To provide a waterproof sheet for civil engineering, having sufficient strength and elongation even at a low temperature of about ?10° C. and having excellent adhesiveness to a structure such as a tunnel. Disclosed is a waterproof sheet for civil engineering, which has a layer (A) including a composition containing an ethylene-vinyl acetate copolymer (a1) and a thermoplastic resin (a2) other than the ethylene-vinyl acetate copolymer (a1), and a silica-containing layer containing silica, wherein the content of the ethylene-vinyl acetate copolymer (a1) in the composition is 30 to 95% by mass, the content of the thermoplastic resin (a2) is 5 to 70% by mass, and the absolute value of the difference between the SP value of the ethylene-vinyl acetate copolymer (a1) and the SP value of the thermoplastic resin (a2) is less than 0.70 (cal/cm3)1/2.

Abstract: The present invention relates to: a polishing pad including a polishing layer having a circular polishing surface, the polishing layer having one or more grooves ? that each have a first end E?1 and a second end E?2 which is closer to the outer circumference of the polishing surface than the first end E?1 is and that each extend from the first end E?1 toward the second end E?2, the first end E?1 of each groove ? being present in an area (1) that is a range of 70.0 to 99.0% relative to the radius of the polishing surface from the center of the polishing surface, the second end E?2 of each groove ? being not connected to the outer circumference of the polishing layer; and a polishing method in which the polishing pad is used.

Abstract: A polyvinyl alcohol fiber that is excellent in secondary processability and water solubility, particularly water solubility at a low temperature is provided. The polyvinyl alcohol fiber includes a poly vinyl alcohol A having a degree of saponification of 90 mol % or more and an ethylene modification rate of 4 to 15 mol % and a polyvinyl alcohol B having a degree of saponification satisfying the following formula (1): 0<?A??B?20 (1). In the formula (1), ?A represents the degree of saponification of the polyvinyl alcohol A and ?B represents the degree of saponification of the polyvinyl alcohol B.

Abstract: The present invention relates to a method for producing a copolymer containing polymerizing monomers including 1,3-diene structure having 4 to 20 carbons in a solvent in a presence of an anionic polymerization initiator.

Abstract: The present disclosure provides a multilayer film comprising a resin composition layer containing an ethylene-vinyl alcohol copolymer with an ethylene unit content of 20 mol % or more and 60 mol % or less and an ethylene-vinyl alcohol copolymer with an ethylene unit content being more than the ethylene-vinyl alcohol copolymer, and a thermoplastic resin layer.

Abstract: Provided is an amorphous epoxy fiber excellent in dimensional stability, a fiber structure comprising at least in part amorphous epoxy fibers, and a molded body formed by melting said fibers. The amorphous epoxy fiber has a birefringence value of 0.005 or lower. For example, the amorphous epoxy fiber may include an amorphous epoxy resin represented by the following general formula: in which, X is a residue of a bivalent phenol and n is 20 or greater (preferably 20 to 300, more preferably 40 to 280, still more preferably 50 to 250). The amorphous epoxy fiber may have an average fiber diameter of single fibers of 40 ?m or smaller.

Abstract: [Problem to be solved] To provide a water-soluble film capable of achieving both cold water solubility and resistance to oxidative deterioration. [Solution] A water-soluble film containing a polyvinyl alcohol resin, wherein the water-soluble film has a surface on at least one side in which an abundance ratio of carbonyl in all carbon bonds obtained by X-ray photoelectron spectroscopy is 1 to 5%, and a complete dissolution time in water at 10° C. is 120 seconds or less.

Abstract: The present disclosure provides a multilayer structure and a rolled structure; and a packaging material including such a multilayer structure. The multilayer structure includes: a paper base material; a layer A laminated to one face side of the paper base material; and a layer B laminated to another face side of the paper base material.

Abstract: The present disclosure provides a composition containing a vinyl alcohol polymer, and a method for separating a vinyl alcohol polymer.

Abstract: [Problem to be solved] To provide a water-soluble film capable of suppressing formation of holes when used as a package while maintaining water solubility, and a package using such a water-soluble film. [Solution] A water-soluble film containing a polyvinyl alcohol resin, wherein within a square A1 with a side of 1 cm or more and 5 cm or less positioned at an arbitrary location on at least one surface of the water-soluble film, each side of an area of square A2 with a side of 5 ?m is divided into 64 to divide the entire area into 4096 pixels, and when elastic moduli of the pixels are measured by an atomic force microscope, a number average value of the elastic moduli of the pixels is 1 to 200 MPa, and a coefficient of variation of the elastic moduli of the pixels is 0.1 to 0.7.

Abstract: The present invention relates to a porous carbon in which a slope of an approximate straight line obtained by converting a change in pressure of nitrogen until reaching an adsorption equilibrium at each prescribed relative pressure in measurement of a nitrogen adsorption isotherm into a mass transfer coefficient using the LDF approximation and linearly approximating a relationship between a relative pressure and a mass transfer coefficient at a relative pressure of 1.0×10?4 or more and 1.0×10?3 or less is 4 or more, and a pore volume of pores having a pore diameter of 2 nm or more and 200 nm or less calculated from the nitrogen adsorption isotherm by a BJH method is 0.8 cm3/g or more.

Abstract: To provide: a polyvinyl alcohol resin which enables obtaining a water-soluble film having favorable cold-water solubility and mechanical strength, has favorable biodegradability, and is superior in filterability in a state of an aqueous solution; a water-soluble film, an extruded product, a filament, a non-woven fabric, and a container each containing such a polyvinyl alcohol resin; a method for producing a water-soluble film; and an aqueous solution. The polyvinyl alcohol resin contains, as a principal component, a modified polyvinyl alcohol containing a unit represented by the following formula (1), wherein a ratio (N1/N2) of the number (N1) of 1-?m-size particles to the number (N2) of 2-?m-size particles contained in 1 mL of a 2% by mass aqueous solution of the polyvinyl alcohol resin is 0.1 or more and 50 or less. In the formula (1), R represents a single bond or a divalent organic group, and M represents a hydrogen atom, a metal atom, or an ammonium group.

Abstract: Provided is an artificial leather base material containing a polyamide fiber having excellent shape stability when wetted with water, and the artificial leather base material contains a polyamide fiber and an elastic polymer, in which in measurement data obtained by X-ray diffraction measurement of the polyamide fiber, a peak intensity ? of a diffraction peak corresponding to a ?-type crystal of a polyamide resin constituting the polyamide fiber and a peak intensity ? of a diffraction peak corresponding to an ?-type crystal of the polyamide resin satisfy a relationship of 0.690??/??1.100.

Abstract: The present disclosure provides a polyvinyl alcohol resin including a modified polyvinyl alcohol comprising an N-vinylamide unit.

Abstract: A vinyl alcohol polymer including, in the same molecule or in different molecules, a carbonyl group, a formyl group, and an alkenyl group. A method for producing a vinyl alcohol polymer, including polymerizing a vinyl ester in a presence of an unsaturated aliphatic aldehyde to obtain a vinyl ester polymer, and saponifying the vinyl ester polymer.

Abstract: There is provided a multi-layer film comprising at least a layer (X), a layer (Y), and a layer (Z) adjacently layered in this order, with the layer (X) being an outermost layer, wherein the layer (X) is made of a resin composition (A) containing a modified ethylene-vinyl alcohol copolymer (a) obtained by modification with an epoxy compound and having a melting point of 110° C. or more and less than 150° C. as a main component, the layer (Y) comprises an adhesive resin (B) having a melting point of less than 150° C. as a main component, the layer (Z) comprises a polyethylene resin (C) having a melting point of less than 150° C. as a main component, and the resin composition (A) contains 20 to 1500 ppm of an alkali metal ion (b). Even though including an outermost layer made of modified EVOH obtained by modification with an epoxy compound, such a multi-layer film is excellent in appearance, interlayer adhesion, gas barrier properties, and blocking resistance.

Abstract: An object of the present invention to provide a composition for nonaqueous electrolyte battery electrodes capable of achieving both good coatability of the composition and the suppression of expansion of electrodes obtained from the composition and an additive for nonaqueous electrolyte battery electrodes. The present invention relates to a composition for nonaqueous electrolyte battery electrodes including a binder; and an organic fiber, wherein the organic fiber has a specific gravity of 1.00 or more and a fiber length of 0.1 mm or more and 10 mm or less.

Abstract: Provided is a method for producing a vinyl ester-based copolymer comprising: polymerizing a composition comprising (i) vinyl ester, and (ii) vinyl monomer with a boiling point of 100° C. or higher to produce a copolymer paste, wherein the vinyl ester has a lower boiling point than the vinyl monomer (polymerization step), removing the vinyl ester from the copolymer paste (removing step), evaporating the vinyl monomer in an evaporator by heating the copolymer paste at a pressure of less than 1 atm (evaporation step), and discharging the copolymer paste having a viscosity of 8000 cP or more from the evaporator. By this method, unreacted vinyl monomer remained in the copolymer paste can be recovered effectively.