A method for producing a coated optical fiber includes coating, using a coating die, a circumferential side surface of an optical fiber with a coating material by passing the optical fiber sequentially through an insertion hole portion, a_ liquid retaining chamber (21), and a_coating hole portion opposed to the insertion hole portion, while the coating material in the liquid retaining chamber is supplied under pressure to the coating hole portion, in which a pressure difference ΔP (MPa) between a liquid pressure of the coating material in the liquid retaining chamber and a pressure outside the coating die, a viscosity .Math. (Pa.Math.s) of the coating material in the liquid retaining chamber, and a length L (mm) of the coating hole portion in an extending direction satisfy a relationship of ΔP/.Math.L ≤ 0.15.

A method for producing a coated optical fiber includes coating, using a coating die, a circumferential side surface of an optical fiber with a coating material by passing the optical fiber sequentially through an insertion hole portion, a_ liquid retaining chamber (21), and a_coating hole portion opposed to the insertion hole portion, while the coating material in the liquid retaining chamber is supplied under pressure to the coating hole portion, in which a pressure difference ΔP (MPa) between a liquid pressure of the coating material in the liquid retaining chamber and a pressure outside the coating die, a viscosity .Math. (Pa.Math.s) of the coating material in the liquid retaining chamber, and a length L (mm) of the coating hole portion in an extending direction satisfy a relationship of ΔP/.Math.L ≤ 0.15.

The present invention relates to a fiber composite material and a method for producing the fiber composite material. The method for producing the fiber composite material includes a hydrolysis step of a silicon precursor having an alkoxy group, an in-situ condensation step and a drying step. A specific silicon precursor having a secondary amino group and alkyl groups is used therein, as well as a specific weight ratio of the silicon precursor to a fiber material, the in-situ condensation step can be performed in the absence of organic solvents in the method for producing the fiber composite material, and a hydrophobic modification on silicon-based gels can be performed, thereby simplifying the process, decreasing a thermal conductivity of the resulted fiber composite material and preventing drop dust of the resulted fiber composite material.

The present invention relates to a fiber composite material and a method for producing the fiber composite material. The method for producing the fiber composite material includes a hydrolysis step of a silicon precursor having an alkoxy group, an in-situ condensation step and a drying step. A specific silicon precursor having a secondary amino group and alkyl groups is used therein, as well as a specific weight ratio of the silicon precursor to a fiber material, the in-situ condensation step can be performed in the absence of organic solvents in the method for producing the fiber composite material, and a hydrophobic modification on silicon-based gels can be performed, thereby simplifying the process, decreasing a thermal conductivity of the resulted fiber composite material and preventing drop dust of the resulted fiber composite material.

A method for preparing optical fibers formed with high-particle-coated porous polymeric outer coating layer is provided. The method includes preparing a coating suspension solution by dispersing a plurality of particles into an organic solvent system, immersing one or more optical fibers into the coating suspension solution, removing the one or more optical fibers from the coating suspension solution to form high-particle-coated porous polymeric outer coating layer after drying. Concentrations and compositions of the particles in the coating suspension solution, concentrations and compositions of the organic solvent system, the period of time of immersing, or the external environment are adjusted such that the optical fibers is formed with high-particle-coated polymeric outer coating layers having desirable coating masses, coating thicknesses, or coating morphologies.

The invention relates to an aqueous coating composition, comprising: a) an aqueous polymer dispersion with said polymer containing monomeric units of at least one dicarboxylic acid monomer, bearing two carboxylic acid functional groups and said polymer remaining insoluble in water after neutralization and remaining in the form of dispersed polymeric particles having a mean particle size varying from 10 to 1000 nm, b) a crosslinker selected from aminoacids bearing at least two amino functional groups capable of reacting with said carboxylic functional groups. It also relates to its use in the treatment of flexible fibrous substrates, a method for and the coated or treated fibrous substrate.

Method and apparatus for producing metal-coated optical fiber involves providing a length of optical fiber having a glass fiber with or without a carbon layer surrounded by a liquid-soluble polymeric coating. The optical fiber is passed through a series of solution baths such that the fiber will contact the solution in each bath for a predetermined dwell time, the series of solution baths effecting removal of the polymer coating and subsequent electroless plating of metal on the glass fiber. The optical fiber is collected after metal plating so that a selected quantity of the metal-coated optical fiber is gathered, Preferably, the glass fiber passes through the series of solution baths without contacting anything except for the respective solution in each.

Method and apparatus for producing metal-coated optical fiber involves providing a length of optical fiber having a glass fiber with or without a carbon layer surrounded by a liquid-soluble polymeric coating. The optical fiber is passed through a series of solution baths such that the fiber will contact the solution in each bath for a predetermined dwell time, the series of solution baths effecting removal of the polymer coating and subsequent electroless plating of metal on the glass fiber. The optical fiber is collected after metal plating so that a selected quantity of the metal-coated optical fiber is gathered, Preferably, the glass fiber passes through the series of solution baths without contacting anything except for the respective solution in each.

The surface-treated glass cloth includes a surface treatment layer on a surface, and the surface treatment layer includes: a first silane coupling agent containing at least one amine selected from the group consisting of a primary amine, a secondary amine and a tertiary amine and containing no quaternary ammonium cation; a second silane coupling agent containing at least one quaternary ammonium cation; an organic acid; and a surfactant. A total content of the first silane coupling agent and the second silane coupling agent is 0.05 to 1.20 mass% based on the total amount of the surface-treated glass cloth, a ratio of a molar content of the first silane coupling agent to a molar content of the second silane coupling agent is 1.1 to 10.0, and a content of the organic acid is 50 to 300 ppm based on the total amount of the surface-treated glass cloth.

An apparatus is arranged to control a quantity of binder resin that is carried by a thread, the apparatus comprising at least one first tine row being arranged parallel and displaceably to at least one second tine row, wherein a guide track for the thread is formed transversely to the tine rows and a displacement of at least one tine row the guide track. A method for controlling the quantity of binder resin by using tines is described as well.