Abstract: A method of preparing a carboxylic acid-modified nitrile-based copolymer latex is provided. The method of preparing a carboxylic acid-modified nitrile-based copolymer later includes emulsion-polymerizing a monomer mixture including a conjugated diene-based monomer, an ethylenically unsaturated nitrile-based monomer, and an ethylenically unsaturated acid monomer in the presence of a cross-linking agent including glyoxal.

Abstract: A latex composition for dip molding includes a carboxylic acid-modified nitrile-based copolymer latex having pKa of 9.5 to 10.2 and satisfying General Formulas 1 and 2. 0.85?P?1.0, P=CVD/CV0??[General Formula 1] 5?M?20, M=m1×m2??[General Formula 2] wherein CV0 represents a capillary viscosity which is measured in a swollen in a methyl ethyl ketone solvent, CVD represents a capillary viscosity in a deswollen state, m1 represents an insolubility of a dried film in the methyl ethyl ketone solvent, and m2 represents a swelling index of the dried film in the methyl ethyl ketone solvent, wherein a carboxylic acid-modified nitrile-based copolymer of carboxylic acid-modified nitrile-based copolymer latex includes: a conjugated diene-based monomer-derived unit, an ethylenic unsaturated nitrile-based monomer-derived unit, and an ethylenic unsaturated acid monomer-derived unit.

Abstract: A laser irradiation device for performing treatment on human skin includes a main body including a barrel part; a laser oscillator that is accommodated in the main body and configured to generate a laser beam to be irradiated through the barrel part; and a skin treatment unit including a lens unit detachably connected to the main body and including a multi-lens that processes the laser beam generated by the laser oscillator into a plurality of laser beams and a functional unit detachably connected to the lens unit.

Abstract: Disclosed is a dip-formed article comprising a layer derived from a latex composition for dip-forming, wherein the latex composition for dip-forming contains a carboxylic acid-modified nitrile-based copolymer latex, the carboxylic acid-modified nitrile-based copolymer latex contains a carboxylic acid-modified nitrile-based copolymer, and the dip-formed article has an elongation of more than 650% and satisfies the following Expressions 1 and 2, [Expression 1] k1?+k2?+k3??9.3 N/mm??(1) [Expression 2] 0.55?k1?/(k1?+k2?+k3?)??(2) wherein k1? is a value obtained by dividing an equilibrium coefficient k1 by a thickness of a test piece, and k2? and k3? are values obtained by dividing viscous coefficients k2 and k3 by the thickness of the test piece, respectively.

Abstract: A latex composition for dip molding includes a carboxylic acid-modified nitrile-based copolymer latex having pKa of 9.5 to 10.2 and satisfying General Formulas 1 and 2. 0.85?P?1.0, P=CVD/CV0??[General Formula 1] 5?M?20, M=m1×m2??[General Formula 2] wherein CV0 represents a capillary viscosity which is measured in a swollen in a methyl ethyl ketone solvent, CVD represents a capillary viscosity in a deswollen state, m1 represents an insolubility of a dried film in the methyl ethyl ketone solvent, and m2 represents a swelling index of the dried film in the methyl ethyl ketone solvent, wherein a carboxylic acid-modified nitrile-based copolymer of carboxylic acid-modified nitrile-based copolymer latex includes: a conjugated diene-based monomer-derived unit, an ethylenic unsaturated nitrile-based monomer-derived unit, and an ethylenic unsaturated acid monomer-derived unit. A molded article having a layer derived from the latex composition is also provided.

Abstract: The present technology relates to a latex composition for dip molding comprising a carboxylic acid-modified nitrile-based copolymer latex satisfying General Formulas 1 and 2, wherein the carboxylic acid-modified nitrile-based copolymer includes a conjugated diene-based monomer-derived unit, an ethylenic unsaturated nitrile-based monomer-derived unit, and an ethylenic unsaturated acid monomer-derived unit, and a molded article.

Abstract: The present invention relates to a latex composition for dip molding, and such latex composition includes: a carboxylic acid-modified nitrile-based copolymer latex; and a reactive compound having three or more branched chains and a reactive group at a terminal of each of the branched chains, wherein the reactive group is one or more selected from the group consisting of an amine group, a hydroxy group, an epoxy group, a glycidyl group, and an isocyanate group.

Abstract: A method of preparing a carboxylic acid-modified nitrile-based copolymer latex is provided. The method of preparing a carboxylic acid-modified nitrile-based copolymer later includes emulsion-polymerizing a monomer mixture including a conjugated diene-based monomer, an ethylenically unsaturated nitrile-based monomer, and an ethylenically unsaturated acid monomer in the presence of a cross-linking agent including glyoxal.

Abstract: A latex composition for dip molding includes a carboxylic acid-modified nitrile-based copolymer latex and a cholate-based emulsifier, wherein the cholate-based emulsifier is included in an amount of 0.02 to 3 parts by weight based on a solid content with respect to a solid content of 100 parts by weight of the carboxylic acid-modified nitrile-based copolymer latex. A method of preparing the latex composition for dip molding and a molded article produced using the same are also provided.

Abstract: A method of preparing a carbon fiber including: preparing a precursor fiber for preparing a carbon fiber; and stabilizing the precursor fiber. The stabilization of the precursor fiber includes a first stabilization phase, a second stabilization phase, a third stabilization phase, and a fourth stabilization phase, which are set at four different temperatures between a temperature at which heat starts to be generated from the stabilization reaction of the precursor fiber and a temperature at which the generation of heat is maximized. Ozone gas is input while at least one phase of the third stabilization phase and the fourth stabilization phase is carried out.

Abstract: A shampoo chair having a seat is provided. When a back of the chair is pushed backwards, a leg support is concurrently lifted up in conjunction with the back of the chair such that a client washing his or her hair can receive a shampoo service in a more comfortable way.

Abstract: The present invention relates to a shampoo chair having a seat wherein when a back of the chair is pushed backwards, a leg support is concurrently lifted up in conjunction with the back of the chair such that a client washing his or her hair can receive a shampoo service in a more comfortable way.