Abstract: Disclosed is an optical fiber with reducing light bias for lighting including: a core extending in a length direction and formed of a material containing a phosphorus (P) based stabilizer; and a clad formed to surround the core, wherein the phosphorus (P) based stabilizer contains cyclic phosphite.

Abstract: Disclosed is an optical fiber with reducing light bias for lighting including: a core extending in a length direction and formed of a material containing a phosphorus (P) based stabilizer; and a clad formed to surround the core, wherein the phosphorus (P) based stabilizer contains cyclic phosphite.

Abstract: A liquid crystal display having a brightness enhancement film and a method of manufacturing the brightness enhancement film, the method including providing a solution of high molecular weight resin on a high molecular weight film, uniformly distributing the solution of high molecular weight resin on the high molecular weight film, and drying the solution of high molecular weight resin to form a high molecular weight resin layer, wherein the high molecular weight resin layer has a hexagonal lattice structure.

Abstract: A liquid crystal display having a brightness enhancement film and a method of manufacturing the brightness enhancement film, the method including providing a solution of high molecular weight resin on a high molecular weight film, uniformly distributing the solution of high molecular weight resin on the high molecular weight film, and drying the solution of high molecular weight resin to form a high molecular weight resin layer, wherein the high molecular weight resin layer has a hexagonal lattice structure.

Abstract: A liquid crystal display having a brightness enhancement film and a method of manufacturing the brightness enhancement film, the method including providing a solution of high molecular weight resin on a high molecular weight film, uniformly distributing the solution of high molecular weight resin on the high molecular weight film, and drying the solution of high molecular weight resin to form a high molecular weight resin layer, wherein the high molecular weight resin layer has a hexagonal lattice structure.

Abstract: Disclosed herein are a novel perfluoroalkyl vinyl ether compound, a process for preparing a copolymer by using the perfluoroalkyl vinyl ether compound, and an optical plastic material comprising a copolymer prepared by the process. More specifically, the perfluoroalkyl vinyl ether has a particular molecular structure; the process is performed by copolymerizing the perfluoroalkyl vinyl ether compound with a common fluorinated olefin in the presence of a perfluorinated radical initiator; and, the optical plastic material comprises a copolymer prepared by the process and optionally a dopant. The copolymerization of the perfluoroalkyl vinyl ether with a common fluorinated olefin can provide a copolymer having a high molecular weight. In addition, appropriate control of the composition of the monomers can provide a completely amorphous copolymer.

Abstract: Disclosed herein are a novel perfluoroalkyl vinyl ether compound, a process for preparing a copolymer by using the perfluoroalkyl vinyl ether compound, and an optical plastic material comprising a copolymer prepared by the process. More specifically, the perfluoroalkyl vinyl ether has a particular molecular structure; the process is performed by copolymerizing the perfluoroalkyl vinyl ether compound with a common fluorinated olefin in the presence of a perfluorinated radical initiator; and, the optical plastic material comprises a copolymer prepared by the process and optionally a dopant.

Abstract: A novel perfluoroalkyl vinyl ether compound, a process for preparing a copolymer by using the perfluoroalkyl vinyl ether compound, and an optical plastic material comprising a copolymer prepared by the process are provided. More specifically, the perfluoroalkyl vinyl ether has a particular molecular structure; the process is performed by copolymerizing the perfluoroalkyl vinyl ether compound with a common fluorinated olefin in the presence of a perfluorinated radical initiator; and the optical plastic material comprises a copolymer prepared by the process and optionally a dopant.

Abstract: A method for treating a polymeric optical element which includes the steps of mounting a polymeric optical element into a chamber, injecting a compressed gas as an annealing medium into the chamber and annealing the polymeric optical element and removing the annealing medium from the chamber. The present method provides a new way of preventing disadvantageous molecular orientation and residual stress which causes a deterioration in the optical properties of the polymeric optical element.

Abstract: Disclosed is a color optical link using a transparently jacketed plastic optical fiber that optically transmits data and uses light, scattered and emitted to the outside, for the purpose of illumination, and a method for achieving the color optical link. The color optical link includes a first driver that receives digital or analog signals and a coloring signal in parallel and converts these signals into optical signals through a plurality of light sources. These light sources emit light of different wavelengths. A first POF coupler, connected at one end of the optical fiber, inputs the received optical signals into the optical fiber. A second POF coupler at the other end separates the transmitted optical signals into a plurality of optical signals and inputs these optical signals into a plurality of optical detectors having filters for separating the received signals into plural signals according to wavelength. A second driver converts the received optical signals into electrical signals.

Abstract: A cavity-preventing type reactor and a method for fabricating a preform for a plastic optical fiber using the same, wherein post-process charging of additional monomer or prepolymer into rotationally-induced central cavities is avoided by forming void-free plastic fibers using special geometric flow controllers combined with special materials combinations, pressures, and rotational techniques.

Abstract: A liquid crystal display having a brightness enhancement film and a method of manufacturing the brightness enhancement film, the method including providing a solution of high molecular weight resin on a high molecular weight film, uniformly distributing the solution of high molecular weight resin on the high molecular weight film, and drying the solution of high molecular weight resin to form a high molecular weight resin layer, wherein the high molecular weight resin layer has a hexagonal lattice structure.

Abstract: A method for treating a polymeric optical element which includes the steps of mounting a polymeric optical element into a chamber, injecting a compressed gas as an annealing medium into the chamber and annealing the polymeric optical element and removing the annealing medium from the chamber. The present method provides a new way of preventing disadvantageous molecular orientation and residual stress which causes a deterioration in the optical properties of the polymeric optical element.

Abstract: An emissive plastic optical fiber using phase separation and a backlight unit for a liquid crystal display using the emissive plastic optical fiber. The emissive plastic optical fiber is fabricated by inducing phase separation in a polymer which forms a core and/or a clad, which can be applied to the backlight unit for a liquid crystal display.

Abstract: A method for fabricating a preform for a plastic optical fiber, comprising: (1) preparing a pair of monomer solutions having different refractive indices; (2) polymerizing a monomer solution having a lower refractive index than the other to form a prepolymer; (3) homogeneously mixing the prepolymer with the other monomer solution to obtain a mixture; and (4) feeding the mixture into a reactor and polymerizing the mixture while the reactor is being rotated. According to the method, a preform for a plastic optical fiber can be fabricated from monomers selected irrespective of their density.

Abstract: A method for fabricating a preform for a plastic optical fiber includes filling a reactor with a reactant including a thermal polymerization initiator and a photopolymerization initiator, and simultaneously or alternatively proceeding with a thermal polymerization and a photopolymerization while rotating the reactor, thereby exhibiting improved process properties and physical properties of the preform, compared to when using only one of the initiators.

Abstract: A method of preparing an object with a radially-varying property is disclosed which includes the steps of providing a preform reactor including an outer container having a bottom, an inner container installed in the outer container, the inner container having a bottom, a rotating rod installed at a position in the outer container, and a sealing member for sealing the outer and inner containers at the bottoms thereof; filling the inner container with an inner material and a space between the inner container and the outer container with an outer material wherein the outer material has a different property from the inner material; removing the inner container; and rotating the rotating rod for laminar mixing of the inner and outer materials. An apparatus for carrying out the inventive method, and objects formed in accordance with the inventive method, are also disclosed.

Abstract: A cavity-preventing type reactor and a method for fabricating a preform for a plastic optical fiber using the same, wherein post-process charging of additional monomer or prepolymer into rotationally-induced central cavities is avoided by forming void-free plastic fibers using special geometric flow controllers combined with special materials combinations, pressures, and rotational techniques.

Abstract: Disclosed is a method for producing an open cell rigid polyurethane foam which comprises reacting the mixture of a polyol for producing rigid polyurethane foam, a volatile blowing agent which is free from environmental pollution and selected from the group consisting of hydrocarbons, hydrofluoroalkanes and perfluoroalkanes or a mixture of the volatile blowing agent with water, a monohydric fatty alcohol having a good solubility to hydrocarbon as a cell opening agent, a foam stabilizer forming a very small cell in the presence of a isocyanate trimer catalyst and an organic isocyanate. The resultant open cell rigid polyurethane foam has a cell size of about less than 95 um, and is suitable for use, for example, as a core material in a vacuum heat insulating material. The foam may be enclosed in a container under a vacuum of 0.1.about.0.01 torr and has a thermal conductivity of 0.0045.about.0.0050 kcal/mhr.degree.C.

Abstract: The present invention relates to a lignocellulose solution and its production method, further to a degradable foam and its production method. The degradable foam of the present invention is produced by foaming and hardening with an ordinary foaming agent and hardening agent the lignocellulose solution which is obtained by dissolving lignocellulose and/or its derivatives in aliphatic polyester polyol, or else such solution with photodegradation promoters added thereto; and is also produced by foaming and hardening with an ordinary foaming agent and an ordinary hardening agent the lignocellulose solution which is obtained by dissolving lignocellulose and/or its derivatives in the bio-/photo-degradable aliphatic polyester polyol which is obtained by a polycondensation of the dicarboxylic acid composed of aliphatic dicarboxylic acid and keto containing dicarboxylic acid or its ester and aliphatic diol.