Abstract: The present invention relates to an optical film and a method of preparing same, the optical film comprising a polymer resin comprising imide repeating units and amide repeating units, the amide repeating units being included at a ratio of at least 80% relative to the imide repeating units and the amide repeating units.

Abstract: The present invention provides: an optical film comprising a polymer resin and having the yellowness index of 3.0 or less and the folding performance parameter of 1.5 GPa or less; and a display device comprising the optical film.

Abstract: Disclosed is an apparatus for assisting an active motion of a finger including a standard stabilizer, a hyperextension-specific stabilizer having a shape being bent in a first direction, in which the finger is extended, an active motion-specific elastic part that generates an elastic force in the first direction or a second direction being an opposite direction to the first direction, and a mounting part, to which one of the standard stabilizer, the hyperextension-specific stabilizer, and the active motion-specific elastic part is selectively coupled to be separable, and on which the finger is worn.

Abstract: The present invention relates to a polyamide-imide based precursor, a polymer prepared from the precursor, an optical film comprising the polymer, and a display device comprising the optical film. A polymer according to an embodiment of the present invention comprises amide repeating units and imide repeating units that are disposed uniformly and alternately, and an optical film comprising such a polymer can exhibit excellent light transmittance, a low yellow index (Y.I), and superb stability.

Abstract: The present invention provides an optical film and a display device including same, the optical film comprising a polymer resin which includes: a first repeating unit; a second repeating unit; a third repeating unit; and a fourth repeating unit, wherein the first repeating unit is an imide repeating unit derived from a first diamine-based compound and a dianhydride-based compound, the second repeating unit is an imide repeating unit derived from a second diamine-based compound and a dianhydride-based compound, the third repeating unit is an amide repeating unit derived from a first diamine-based compound and a dicarbonyl-based compound, and the fourth repeating unit is an amide repeating unit derived from a second diamine-based compound and a dicarbonyl-based compound.

Abstract: One embodiment of the present invention provides a method for manufacturing a light-transmissive film, a light-transmissive film manufactured by the manufacturing method, and a display device comprising the light-transmissive film, the method comprising the steps of: preparing a light-transmissive resin powder; preparing a light-transmissive resin solution by dissolving a first amount of the light-transmissive resin powder in a first solvent; preparing a filler dispersion solution by dispersing a filler in a second solvent; preparing a first mixture solution by mixing the filler dispersion solution and the light-transmissive resin solution; and preparing a second mixture solution by adding a second amount of the light-transmissive resin powder to the first mixture solution and dissolving same.

Abstract: The present invention provides: a polyimide-based film, which comprises a polyimide-based matrix and a filler dispersed in the polyimide-based matrix and has a density ratio (DR) of the true density relative to the density in a density gradient column, of 1.10 or less; and a display device comprising the polyimide-based film.

Abstract: Disclosed are a polyimide-based film and a method of producing the same, and more particularly, a polyimide-based film having excellent surface evenness and suppressed waviness due to low Kc of 1.55 or less and a method of producing the same.

Abstract: Disclosed is a plastic substrate, which includes a plastic film, a metal layer, and a resin layer having a conductive material dispersed therein and which is useful as a lower substrate of a transmissive electronic paper display device or a display device.

Abstract: This invention relates to a highly heat-resistant polyamic acid solution and a polyimide film having improved thermal dimensional stability, wherein the polyamic acid solution includes a polymer of a diamine compound, containing 1 to 10 mol % of a carboxylic acid functional group-containing diamine compound based on the total amount of diamine, and a dianhydride compound, and the polyimide film includes polyimide, which is an imidized product of the polyamic acid solution and is configured such that main chains thereof are crosslinked through an amide bond (—CONH—).

Abstract: Disclosed is a polyamide-imide precursor having a molecular structure in which a first polymer, derived from polymerization of a dianhydride and a diamine, and a second polymer, derived from polymerization of a diamine and an aromatic dicarbonyl compound, are copolymerized, wherein the diamine includes 3 to 50 mol % of at least one of 9,9-bis(4-aminophenyl)fluorene (FDA) and 9,9-bis(4-amino-3-fluorophenyl)fluorene (F-FDA), based on the total molar amount of the diamine. Also, a copolymerized polyamide-imide in which the polyamide-imide precursor is imidized or a copolymerized polyamide-imide film formed by an imidization reaction of the polyamide-imide precursor and an image display device including the copolymerized polyamide-imide film are provided.

Abstract: Disclosed is a polyamide-imide precursor having a molecular structure in which a first polymer, derived from polymerization of a dianhydride and a diamine, and a second polymer, derived from polymerization of a diamine and an aromatic dicarbonyl compound, are copolymerized, wherein the diamine includes 3 to 50 mol % of at least one of 9,9-bis(4-aminophenyl)fluorene (FDA) and 9,9-bis(4-amino-3-fluorophenyl)fluorene (F-FDA), based on the total molar amount of the diamine. Also, a copolymerized polyamide-imide in which the polyamide-imide precursor is imidized or a copolymerized polyamide-imide film formed by an imidization reaction of the polyamide-imide precursor and an image display device including the copolymerized polyamide-imide film are provided.

Abstract: This invention relates to polyimide, which includes amorphous silica particles having OH groups thereon and is thus highly heat-resistant, colorless and transparent, and to a polyimide film manufactured using the polyimide.

Abstract: This invention relates to a polyimide resin and a film using the same, wherein the polyimide resin is an imidized product of polyamic acid in which a polymerization composition including a diamine-based monomer and a dianhydride-based monomer is copolymerized, at least one of the diamine-based monomer and the dianhydride-based monomer including a monomer containing at least one selected from among an oxy group, a sulfone group and a fluoro group, the diamine-based monomer including at least one selected from among 1,3-bis(4-aminophenoxy)benzene and 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane, and thus the polyimide resin has improved heat resistance and mechanical properties while being colorless and transparent and can thus be efficiently applied to a variety of fields, including semiconductor insulation layers, TFT-LCD insulation layers, passivation layers, liquid crystal alignment layers, optical communication materials, protective layers for solar cells, and flexible display substrates.

Abstract: Disclosed is a plastic substrate, which includes a plastic film, a metal layer, and a resin layer having a conductive material dispersed therein and which is useful as a lower substrate of a transmissive electronic paper display device or a display device.

Abstract: This invention relates to a highly heat-resistant polyamic acid solution and a polyimide film having improved thermal dimensional stability, wherein the polyamic acid solution includes a polymer of a diamine compound, containing 1 to 10 mol % of a carboxylic acid functional group-containing diamine compound based on the total amount of diamine, and a dianhydride compound, and the polyimide film includes polyimide, which is an imidized product of the polyamic acid solution and is configured such that main chains thereof are crosslinked through an amide bond (—CONH—).

Abstract: Disclosed is a plastic substrate, which includes a plastic film, a reflective and/or conductive metal layer, and a resin layer having a conductive material dispersed therein and which is useful as a lower substrate of a transmissive electronic paper display device or a display device.

Abstract: The present invention provides a plastic substrate, including: a polyimide film; a hard coating layer formed on one side of the polyimide film; and a transparent electrode layer formed on the other side of the polyimide film. The plastic substrate has excellent light transmittance high hardness characteristics, superior ITO processability and flexibility. Further, the plastic substrate can function as both a window film and an electrode film when it is applied to a touch screen panel. Thus, the present invention provides a touch screen panel which can be slimmed by reducing the number of laminated films including the plastic substrate.

Abstract: The present invention relates to a novel acid dianhydride, a method for preparing the same, and a polyimide prepared therefrom. More specifically, the acid dianhydride according to the present invention is useful as a colorless transparent polyimide unit exhibiting excellent thermal stability and a low dielectric ratio, and the polyimide of the present invention has excellent solubility to an organic solvent compared with the conventional polyimide.

Abstract: Disclosed are a transparent polyamide-imide resin and a film using the same, which can be colorless and transparent, can show excellent thermal stability and mechanical properties, and can have low birefringence, making it possible to serve in various fields including a semiconductor insulator, a TFT-LCD insulator, a passivation layer, a liquid crystal alignment layer, materials for optical communication, a protective film for a solar cell, a flexible display substrate and the like.