Abstract: The present invention relates to an optical film that comprises an aromatic based resin comprising a chain having the hydroxy group containing portion and aromatic moiety and a polarizing plate and an information electronic device that include the same. The in-plane retardation Rin is in the range of 0 to 600 nm and the thickness retardation Rth is in the range of 0 to 400 nm.

Abstract: The present invention relates to a transparent resin composition which comprises (a) a (meth)acrylate based resin comprising one or more (meth)acrylate based derivatives; and (b) an aromatic based resin having a chain having the hydroxy group containing portion and an aromatic moiety.

Abstract: The present invention relates to a composition for forming a gate insulating layer of an organic thin film transistor comprising polyarylate, and an organic thin film transistor comprising a gate insulating layer, which is formed using the composition, in contact with an organic semiconductor channel.

Abstract: The present invention relates to a process for preparing polyarylate, and more specifically, to a process for preparing polyarylate by interfacial polymerization of a bivalent phenol compound and an aromatic dicarboxylic acid or a halide thereof, which comprises mixing a cationic catalyst for the phase transition and a nonionic surfactant in a predetermined ratio, to further increase the yield of polyarylate, as compared with the case of using each of the nonionic surfactant and the cationic catalyst for the phase transition alone.

Abstract: Disclosed is a negative C-type retardation compensator for a liquid crystal display. The negative C-type retardation compensator for the liquid crystal display includes polyarylate having a thio group or a sulfur oxide group in a polymer main chain thereof. Accordingly, the retardation compensator has an absolute value of negative retardation that is larger in a thickness direction than a retardation compensator which includes polyarylate having no thio group or sulfur oxide group in a polymer main chain thereof even though the retardation compensator having the thio group or sulfur oxide group and the retardation compensator having no thio group or sulfur oxide group are the same as each other in thickness. Thereby, the negative C-type retardation compensator for liquid crystal displays is capable of being desirably applied to the liquid crystal displays.

Abstract: A process for preparing polyarylate wherein a bivalent phenol compound having the structure of Formula 1 and an aromatic dicarboxylic acid halogen compound react to prepare a polyarylate, and wherein a nonionic surface-active agent is added. This decreases residual salts and improves the transmittance and the heat-resistance. In Formula 1, R1, R2, R3 and R4 denote the same as illustrated in the description.

Abstract: The present invention relates to a plastic substrate having a multi-layer structure and a method for preparing the same. The plastic substrate of the present invention comprises plastic films attached to each other, and a first buffering layer of an organic-inorganic hybrid, a layer of gas barrier, and a second buffering layer of an organic-inorganic hybrid which are stacked on both sides of the plastic films in an orderly manner, each layer forming a symmetrical arrangement centering around the plastic films. Because the plastic substrate of the present invention has a small coefficient of thermal expansion, excellent dimensional stability, and superior gas barrier properties, it can replace the brittle and heavy glass substrate in display devices. Also, it can be used for a variety of packaging or container materials in applications requiring superior gas barrier properties.

Abstract: The present invention relates to a polyarylate film having high level of negative phase difference toward out of plane direction, which is good enough to be used as an optical compensator film providing wide view angle. The polyarylate film prepared in the present invention has bigger birefringence toward out of plane direction than that of polymer for the conventional compensator film, suggesting that it not only reduces the thickness of the final product but also has the effect of optical compensation only with thin film coating.

Abstract: The present invention relates to a compensator film having multilayer structure including both negative optical retardation in thickness direction and optical retardation in in-plane direction at the same time to improve wide view angle, in which a polymer base layer provides optical retardation in in-plane direction, organic or organic/inorganic hybrid protective layer formed on the base layer contributes to the improvement of mechanical properties such as curl prevention and polymer orientation of coating layer, and the out-most layer, a polymer coating layer, endows optical retardation in thickness direction. The multilayer, in which each layer is individually functioning, enables the preparation of a compensator film having proper optical retardation.

Abstract: The present invention relates to a plastic substrate having a multi-layer structure and a method for preparing the same. The plastic substrate of the present invention comprises plastic films attached to each other, and a first buffering layer of an organic-inorganic hybrid, a layer of gas barrier, and a second buffering layer of an organic-inorganic hybrid which are stacked on both sides of the plastic films in an orderly manner, each layer forming a symmetrical arrangement centering around the plastic films. Because the plastic substrate of the present invention has a small coefficient of thermal expansion, excellent dimensional stability, and superior gas barrier properties, it can replace the brittle and heavy glass substrate in display devices. Also, it can be used for a variety of packaging or container materials in applications requiring superior gas barrier properties.

Abstract: The present invention relates to an organic-inorganic nanocomposite and preparation thereof and particularly to a method for preparing an organic-inorganic nanocomposite capable of uniformly dispersing a silicate compound in a polymer medium by adding monomers, an initiator, and an emulsifier to an ion-exchanged layered silicate salt that is prepared by adding a cationic initiator and a cationic chain transfer agent to a layered silicate compound to cause polymerization.

Abstract: The present invention relates to a process for preparing polyarylate having a high heat-resistance and a high transmittance with a low residual salt, more particularly to a process for preparing polyarylate wherein a bivalent phenol compound having the structure of Formula 1 and an aromatic dicarboxylic acid halogen compound are reacted by a interfacial polymerization to prepare a polyarylate, characterized in that a nonionic surface-active agent is added. The polyarylate prepared by the process of the present invention acquires an excellent effect to decrease residual salts and to improve the transmittance and the heat-resistance highly. <Formula 1> In the above Formula 1, R1, R2, R3 and R4 denote the same as illustrated in the description.

Abstract: The present invention relates to a plastic substrate having a multi-layer structure and a method for preparing the same. The plastic substrate of the present invention comprises plastic films attached to each other, and a first buffering layer of an organic-inorganic hybrid, a layer of gas barrier, and a second buffering layer of an organic-inorganic hybrid which are stacked on both sides of the plastic films in an orderly manner, each layer forming a symmetrical arrangement centering around the plastic films. Because the plastic substrate of the present invention has a small coefficient of thermal expansion, excellent dimensional stability, and superior gas barrier properties, it can replace the brittle and heavy glass substrate in display devices. Also, it can be used for a variety of packaging or container materials in applications requiring superior gas barrier properties.

Abstract: Disclosed are water soluble dithioesters capable of acting as chain transfer agents in preparing a vinyl-based polymer to control molecular weight and molecular weight distribution thereof as well as being capable of living polymerization even in an aqueous solution, and a method for polymerization thereof.

Abstract: The present invention relates to an organic-inorganic nanocomposite and preparation thereof and particularly to a method for preparing an organic-inorganic nanocomposite capable of uniformly dispersing a silicate compound in a polymer medium by adding monomers, an initiator, and an emulsifier to an ion-exchanged layered silicate salt that is prepared by adding a cationic initiator and a cationic chain transfer agent to a layered silicate compound to cause polymerization.

Abstract: Disclosed are water soluble dithioesters capable of acting as chain transfer agents in preparing a vinyl-based polymer to control molecular weight and molecular weight distribution thereof as well as being capable of living polymerization even in an aqueous solution, and a method for polymerization thereof.