Abstract: A cubic boron nitride sintered material comprises cubic boron nitride particles and a bonding material, wherein the bonding material comprises at least one first metallic element selected from the group consisting of titanium, zirconium, vanadium, niobium, hafnium, tantalum, chromium, rhenium, molybdenum, and tungsten; cobalt; and aluminum; the cubic boron nitride sintered material has a first interface region sandwiched between an interface between the cubic boron nitride particles and the bonding material, and a first virtual line passing through a point 10 nm apart from the interface to the bonding material side; and when an element that is present at the highest concentration among the first metallic elements in the first interface region is defined as a first element, an atomic concentration of the first element in the first interface region is higher than an atomic concentration of the first element in the bonding material excluding the first interface region.

Abstract: To provide a process for producing a fluorinated crosslinked product which is excellent in stability and produces less HF. A process for producing a fluorinated crosslinked product, which comprises irradiating a fluorinated polymer having a unit represented by the following formula (1), with active energy rays having a wavelength of from 150 to 300 nm: wherein X1 and X2 are each independently a hydrogen atom or a fluorine atom, Rf1 is a fluoroalkylene group or a fluoroalkylene group having at least two carbon atoms and an etheric oxygen atom between carbon-carbon atoms, Q1 is a single bond or an etheric oxygen atom, and Z1 is OH, OR1 or NR2R3, wherein R1 is an alkyl group, and R2 and R3 are each independently a hydrogen atom or an alkyl group.

Abstract: To provide a terminal group conversion method and a terminal stabilizing method, which are capable of converting unstable terminal groups in a fluorinated polymer to carboxylic acid fluoride groups at a high conversion rate. A fluorinated polymer is heated at from 200 to 400° C. for at least one hour in the presence of at least 50 mol of molecular oxygen per 1 mol of unstable terminal groups in the fluorinated polymer, to convert from 50 to 100 mol % of the unstable terminal groups to carboxylic acid fluoride groups.

Abstract: To provide a process for producing a fluorinated crosslinked product which is excellent in stability and produces less HF. A process for producing a fluorinated crosslinked product, which comprises irradiating a fluorinated polymer having a unit represented by the following formula (1), with active energy rays having a wavelength of from 150 to 300 nm: wherein X1 and X2 are each independently a hydrogen atom or a fluorine atom, Rf1 is a fluoroalkylene group or a fluoroalkylene group having at least two carbon atoms and an etheric oxygen atom between carbon-carbon atoms, Q1 is a single bond or an etheric oxygen atom, and Z1 is OH, OR1 or NR2R3, wherein R1 is an alkyl group, and R2 and R3 are each independently a hydrogen atom or an alkyl group.

Abstract: To provide a coating composition which exhibits excellent followability to a difference in level in its application, and which is capable of forming a coating layer having a low refractive index in a short-wavelength region and exhibiting excellent solubility to an alkaline aqueous solution. A coating composition comprising a solvent and a fluorinated polymer (A) which has a unit represented by —[CX1X2—CY(—Rf—COOM)]— and has a number average molecular weight of from 1,000 to 7,500. X1 and X2 are each independently a hydrogen atom, a fluorine atom or a chlorine atom; Y is a hydrogen atom, a fluorine atom, a chlorine atom, a methyl group or a trifluoromethyl group; Rf is a branched perfluoroalkylene group which may contain an etheric oxygen atom between carbon-carbon atoms, or a branched oxyperfluoroalkylene group which may contain an etheric oxygen atom between carbon-carbon atoms; and M is a hydrogen atom or an ammonium ion which may be substituted.

Abstract: To provide a terminal group conversion method and a terminal stabilizing method, which are capable of converting unstable terminal groups in a fluorinated polymer to carboxylic acid fluoride groups at a high conversion rate. A fluorinated polymer is heated at from 200 to 400° C. for at least one hour in the presence of at least 50 mol of molecular oxygen per 1 mol of unstable terminal groups in the fluorinated polymer, to convert from 50 to 100 mol % of the unstable terminal groups to carboxylic acid fluoride groups.

Abstract: To provide an oil repellent waterproof air-permeable filter of which environmental burden is small and which has an excellent liquid repellency to ketone solvents and ester solvents, and its production process. An oil repellent waterproof air-permeable filter comprising a substrate having a continuous porous structure and a coating material covering the substrate and containing a fluoropolymer having a perfluoroalkyl group, wherein the fluoropolymer has constituent units based on an acrylate having a chlorine atom at an ? position and a C1-6 perfluoroalkyl group, and the proportion of said constituent units is from 40 to 100 mass % in the total constituent units. A process for producing an oil repellent waterproof air-permeable filter, treating the substrate with an oil repellent waterproof composition containing a medium and the coating material and removing the medium.

Abstract: A photocurable composition capable of producing a micropattern-formed product efficiently, which is excellent in physical properties such as heat resistance, chemical resistance, releasability and optical characteristics (transmittance and low refractive index), and a process for producing a micropattern-formed product, capable of highly precisely transferring a micropattern of a mold to its surface are provided. A photocurable composition which comprises from 50 to 98 mass % of a monomer containing no fluorine atom and having a viscosity at 25° C. of from 0.1 to 100 mPa·s, from 0.1 to 45 mass % of a fluoromonomer, from more than 0.1 to 20 mass % of a fluorinated surfactant and/or a fluoropolymer and from 1 to 10 mass % of a photopolymerization initiator, and contains substantially no solvent.

Abstract: To provide an oil repellent copolymer capable of forming an oil repellent film which is excellent in durability. An oil repellent copolymer characterized by comprising a repeating unit (A) having a polyfluoroalkyl group, a repeating unit (B) having a fluorescent functional group, and a repeating unit (C) having an ester bond other than an ester bond derived from acrylic acid, and/or a hydroxyl group.

Abstract: To provide an oil repellent copolymer capable of forming an oil repellent film which is excellent in durability. An oil repellent copolymer characterized by comprising a repeating unit (A) having a polyfluoroalkyl group, a repeating unit (B) having a fluorescent functional group, and a repeating unit (C) having an ester bond other than an ester bond derived from acrylic acid, and/or a hydroxyl group.

Abstract: To provide a process for producing a hollow cylindrical or solid cylindrical mold having a seamless patterned layer comprising a fluoropolymer. A process for producing a mold comprising a hollow cylindrical or solid cylindrical substrate 12 and a patterned layer comprising a fluoropolymer and having a pattern formed on its surface, which comprises a step of forming a film 32 comprising a fluoropolymer so as to cover the circumferential surface of the substrate 12 thereby to obtain a mold precursor 30; and a step of rolling the mold precursor 30 in such a state that the circumferential surface of the mold precursor 30 is pushed against a surface of a heated original mold 40 having a pattern reverse to the pattern of the patterned layer, to transfer the reversal pattern of the original mold 40 to the film 32 comprising a fluoropolymer to form the patterned layer.

Abstract: The present invention provides a wire-grid polarizer showing high polarization separation ability in the visible light region and is excellent in heat resistance and durability; and a process for producing such a wire-grid polarizer with high productivity, which enables to produce a polarizer of large area. A process for producing a wire-grid polarizer, comprising a step of coating a supporting substrate with a photocurable composition, a step of pressing a mold having a plurality of parallel grooves at a constant pitch against the photocurable composition so that the grooves contact with the photocurable composition, a step of curing the photocurable composition in a state that the mold is pressed against the photocurable composition, to form a light-transmitting substrate having a plurality of ridges corresponding to the grooves of the mold, a step of separating the mold from the light-transmitting substrate, and a step of forming fine metalic wires on the ridges of the light-transmitting substrate.

Abstract: A photocurable composition capable of producing a micropattern-formed product efficiently, which is excellent in physical properties such as heat resistance, chemical resistance, releasability and optical characteristics (transmittance and low refractive index), and a process for producing a micropattern-formed product, capable of highly precisely transferring a micropattern of a mold to its surface are provided. A photocurable composition which comprises from 50 to 98 mass % of a monomer containing no fluorine atom and having a viscosity at 25° C. of from 0.1 to 100 mPa·s, from 0.1 to 45 mass % of a fluoromonomer, from more than 0.1 to 20 mass % of a fluorinated surfactant and/or a fluoropolymer and from 1 to 10 mass % of a photopolymerization initiator, and contains substantially no solvent.

Abstract: A non-vinylidene fluororesin powder coating material having blocking resistance and high impact resistance, is provided. A fluororesin powder coating composition comprising a non-vinylidene fluororesin having a Tg higher than 40° C. and a resin having a Tg of from 0 to 40° C.

Abstract: A composition for fluororesin powder coating material, with which a coating film having an excellent matte effect is obtainable without impairing features of fluororesins including excellent weather resistance, and a process for its production, are presented. The composition for fluororesin powder coating material comprises at least two curing systems each comprising a fluororesin having crosslinkable sites and a curing agent reactive to the crosslinkable sites, wherein the respective curing systems substantially independently react and crosslink, and the crosslinking reaction time of one curing system is different by at least 20 seconds from the crosslinking reaction time of other curing system(s).

Abstract: A non-vinylidene fluororesin powder coating material having blocking resistance and high impact resistance, is provided. A fluororesin powder coating composition comprising a non-vinylidene fluororesin having a Tg higher than 40° C. and a resin having a Tg of from 0 to 40° C.

Abstract: A composition for fluororesin powder coating material, with which a coating film having an excellent matte effect is obtainable without impairing features of fluororesins including excellent weather resistance, and a process for its production, are presented. The composition for fluororesin powder coating material comprises at least two curing systems each comprising a fluororesin having crosslinkable sites and a curing agent reactive to the crosslinkable sites, wherein the respective curing systems substantially independently react and crosslink, and the crosslinking reaction time of one curing system is different by at least 20 seconds from the crosslinking reaction time of other curing system(s).