Abstract: Provided is a water-repellent member in which a silica layer having a specific thickness and mainly composed of silica nanoparticles is provided on the outer surfaces of various substrates, and then a water- and oil-repellent layer having a specific thickness and containing a cured product of a fluorine-containing organosilicon compound as a main component is provided on the outer surface of the silica layer. The water-repellent member is obtained by a method comprising: a step for wet coating a dispersion containing silica nanoparticles and a solvent onto the outer surface of a substrate; a step for drying and removing the solvent from the dispersion; a step for wet coating a solution containing a fluorine-containing organosilicon compound and a solvent onto the outer surface of a silica layer formed by drying and removing the solvent; and a step for drying and removing the solvent from the solution to cure the fluorine-containing organosilicon compound.

Abstract: Provided is a water-repellent member in which a silica layer having a specific thickness and mainly composed of silica nanoparticles is provided on the outer surfaces of various substrates, and then a water- and oil-repellent layer having a specific thickness and containing a cured product of a fluorine-containing organosilicon compound as a main component is provided on the outer surface of the silica layer. The water-repellent member is obtained by a method comprising: a step for wet coating a dispersion containing silica nanoparticles and a solvent onto the outer surface of a substrate; a step for drying and removing the solvent from the dispersion; a step for wet coating a solution containing a fluorine-containing organosilicon compound and a solvent onto the outer surface of a silica layer formed by drying and removing the solvent; and a step for drying and removing the solvent from the solution to cure the fluorine-containing organosilicon compound.

Abstract: This surface treatment agent using a compound represented by formula (1) or (2) can, even without having a hydrolyzable group, form a water repellent and oil repellent layer having excellent abrasion resistance under mild conditions such as at room temperature. [Rf represents a monovalent or divalent fluorooxyalkylene group-containing polymer residue, Y1 and Y2 each represent a single bond or a divalent hydrocarbon group, Q represents a group that has a Si-containing structure having a valence of 2-4, Si, or C, X represents an epoxy-containing group, k represents 0-2, m represents 1-5, n represents 1-3, Z represents H, —SiR3 (R represents an alkyl group or a phenyl group), or —W1-Q?-W2—X? (X? represents X or —SiR3, W1 and W2 each represent a single bond or a divalent hydrocarbon group, Q? represents a divalent group having a Si-containing structure), and ? represents 1 or 2].

Abstract: Provided is an antireflective member that has a water- and oil-repellent layer on a multi-layered antireflective layer and is capable of exhibiting excellent surface lubricity, water- and oil-repellent properties, and durability. The surface of the multi-layered antireflective layer on a base material has a root-mean-square surface roughness of 0.8 nm to 2.0 nm. The water- and oil-repellent layer has a thickness of 1 to 30 nm and is a cured product of water- and oil-repellents having as principal components a fluorooxyalkylene group-containing polymer modified organosilicon compound with the numerical average molecular weight of 4,500 to 10,000 of a fluoropolymer part and/or partial hydrolysis condensate thereof.

Abstract: Provided is an antireflective member that has a water- and oil-repellent layer on a multi-layered antireflective layer and is capable of exhibiting excellent surface lubricity, water- and oil-repellent properties, and durability. The surface of the multi-layered antireflective layer on a base material has a root-mean-square surface roughness of 0.8 nm to 2.0 nm. The water- and oil-repellent layer has a thickness of 1 to 30 nm and is a cured product of water- and oil-repellents having as principal components a fluorooxyalkylene group-containing polymer modified organosilicon compound with the numerical average molecular weight of 4,500 to 10,000 of a fluoropolymer part and/or partial hydrolysis condensate thereof.

Abstract: This fluorine-containing coating agent composition contains: (A) an organic silicon compound containing a hydrolyzable group or a hydroxy group modified by a fluorooxyalkylene group-containing polymer residue, and/or a partial (hydrolyzed) condensate thereof; and (B) an organic silicon compound containing a polyether group and a hydrolyzable group or a hydroxy group modified by a fluorooxyalkylene group-containing polymer residue, and/or a partial (hydrolyzed) condensate thereof, wherein the mixture mass ratio of component (A) and component (B) is 15:85-85:15. When the composition is applied as a surface treatment agent, the surface treatment agent containing the fluorine-containing coating agent composition can form a cured coating film which has excellent water repellency and oil repellency, and which has both excellent steel wool abrasion resistance and eraser rubber abrasion resistance.

Abstract: This surface treatment agent using a compound represented by formula (1) or (2) can, even without having a hydrolyzable group, form a water repellent and oil repellent layer having excellent abrasion resistance under mild conditions such as at room temperature. [Rf represents a monovalent or divalent fluorooxyalkylene group-containing polymer residue, Y1 and Y2 each represent a single bond or a divalent hydrocarbon group, Q represents a group that has a Si-containing structure having a valence of 2-4, Si, or C, X represents an epoxy-containing group, k represents 0-2, m represents 1-5, n represents 1-3, Z represents H, —SiR3 (R represents an alkyl group or a phenyl group), or -W1-Q?-W2-X? (X? represents X or —SiR3, W1 and W2 each represent a single bond or a divalent hydrocarbon group, Q? represents a divalent group having a Si-containing structure), and a represents 1 or 2].

Abstract: Provided is a water-repellent member in which a silica layer having a specific thickness and mainly composed of silica nanoparticles is provided on the outer surfaces of various substrates, and then a water- and oil-repellent layer having a specific thickness and containing a cured product of a fluorine-containing organosilicon compound as a main component is provided on the outer surface of the silica layer. The water-repellent member is obtained by a method comprising: a step for wet coating a dispersion containing silica nanoparticles and a solvent onto the outer surface of a substrate; a step for drying and removing the solvent from the dispersion; a step for wet coating a solution containing a fluorine-containing organosilicon compound and a solvent onto the outer surface of a silica layer formed by drying and removing the solvent; and a step for drying and removing the solvent from the solution to cure the fluorine-containing organosilicon compound.

Abstract: This surface treatment agent can form a water repellent/oil repellent layer having particularly excellent wear durability, weather resistance, and alkali resistance, and contains a fluorinated coating agent composition containing: (A) one or more selected from hydroxy group- or hydrolyzable group-containing silanes and siloxanes modified with a fluorooxyalkylene group-containing polymer, and partial (hydrolyzed) condensates thereof, and (B) a fluorooxyalkylene group-containing polymer-modified polysilazane formed of silazane units modified with a fluorooxyalkylene group-containing polymer, wherein the number-average molecular weight of fluorooxyalkylene group-containing polymer residues in the component (A) is 1,500-10,000, the number-average molecular weight of fluorooxyalkylene group-containing polymer residues in the silazane units modified with the fluorooxyalkylene group-containing polymer in the component (B) is 500-6,000, and the mixed mass ratio between the component (A) and the component (B) is 10:90

Abstract: This water-repellent, oil-repellent member is obtained via a method comprising: a step for wet-coating a substrate surface with a solution containing an organic silicon compound comprising multiple silanol groups and a solvent; a step for drying the solvent to form a primer layer; a step for wet-coating the primer layer with a solution containing a fluorine-containing compound and a solvent, followed by drying the solvent, or dry-coating with the fluorine-containing compound obtained by evaporating the solvent from the solution; and a step for curing the fluorine-containing compound to form a water-repellent, oil-repellent layer.