Abstract: The present invention provides a method for manufacturing a polymer film, the method comprising the steps of: drying a polymer precursor to form a precursor film; and curing the precursor film to form a polymer film, wherein the drying is performed such that the content of a solvent remaining in the precursor film after the drying is 30% or less.

Abstract: Provided are a multi-layer flexible metal-clad laminate, and a manufacturing method thereof, and more particularly, a multi-layer flexible metal-clad laminate in which at the time of manufacturing a multi-layer polyimide film on a surface of a metal-clad having a predetermined surface roughness value (Rz, Ra) and having roughening particles having a predetermined size or less attached thereon, a multi-coating scheme is used to form each polyimide mixed layer, such that a light reflection on a surface of the polyimide film and a light reflection generated at an interlayer interface of the polyimide in the multi-layer polyimide film are decreased to have an improved light transmittance of a polyimide laminate film after the metal-clad is removed, and a manufacturing method thereof.

Abstract: The present invention provides a method for manufacturing a polymer film, the method comprising the steps of: drying a polymer precursor to form a precursor film; and curing the precursor film to form a polymer film, wherein the drying is performed such that the content of a solvent remaining in the precursor film after the drying is 30% or less.

Abstract: Provided is a flexible metal-clad laminate, comprising; a first metal layer; a first polyimide layer having a coefficient of linear thermal expansion of 25 ppm/K or less which is formed on the first metal layer and plasma-treated; a second polyimide layer having a coefficient of linear thermal expansion of 25 ppm/K or less which is formed on the first polyimide layer.

Abstract: Provided is a method for manufacturing a flexible metal-clad laminate using a casting method, including: (a) forming a first polyimide layer having a coefficient of linear thermal expansion of 25 ppm/K or less above a metal layer; (b) plasma-treating a surface of the first polyimide layer; and (c) forming a second polyimide layer having a coefficient of linear thermal expansion of 25 ppm/K or lower above the first polyimide layer. The flexible metal-clad laminate according to the present invention can have excellent adhesion between the polymer film and the metal conductive layer, a low dimensional change, and a low production cost, because of superior casting workability, even though the thickness of polyimide becomes increased.

Abstract: A flexible metal clad laminate includes a metal foil, and a multilayered polyimide film including a first polyimide layer having a glass transition temperature of 300° C. or less and disposed on the metal foil, a second polyimide layer disposed on the first polyimide layer and a third polyimide layer disposed on the second polyimide layer. According to the flexible metal clad laminate of the present invention, appearance defects such as blistering generated during curing process in a continuous curing machine using an infrared heat source may be solved, interlayer delamination may be prevented due to a good adhesion strength with a metal layer, and an ACF bonding strength and a dimensional stability may be good. The flexible metal clad laminate may be useful for the manufacturing of a flexible printed circuit boards.

Abstract: Provided are a multi-layer flexible metal-clad laminate, and a manufacturing method thereof, and more particularly, a multi-layer flexible metal-clad laminate in which at the time of manufacturing a multi-layer polyimide film on a surface of a metal-clad having a predetermined surface roughness value (Rz, Ra) and having roughening particles having a predetermined size or less attached thereon, a multi-coating scheme is used to form each polyimide mixed layer, such that a light reflection on a surface of the polyimide film and a light reflection generated at an interlayer interface of the polyimide in the multi-layer polyimide film are decreased to have an improved light transmittance of a polyimide laminate film after the metal-clad is removed, and a manufacturing method thereof.

Abstract: A flexible metal clad laminate includes a metal foil, and a multilayered polyimide film including a first polyimide layer having a glass transition temperature of 300° C. or less and disposed on the metal foil, a second polyimide layer disposed on the first polyimide layer and a third polyimide layer disposed on the second polyimide layer. According to the flexible metal clad laminate of the present invention, appearance defects such as blistering generated during curing process in a continuous curing machine using an infrared heat source may be solved, interlayer delamination may be prevented due to a good adhesion strength with a metal layer, and an ACF bonding strength and a dimensional stability may be good. The flexible metal clad laminate may be useful for the manufacturing of a flexible printed circuit boards.

Abstract: There is provided a polyamic acid resin composition, a method for preparing the same and a polyimide metal clad laminate using the same, in which the polyamic acid resin composition includes an epoxy compound represented by Chemical Formula 1 is defined in specification.

Abstract: Provided is a method for manufacturing a flexible metal-clad laminate using a casting method, including: (a) forming a first polyimide layer having a coefficient of linear thermal expansion of 25 ppm/K or less above a metal layer; (b) plasma-treating a surface of the first polyimide layer; and (c) forming a second polyimide layer having a coefficient of linear thermal expansion of 25 ppm/K or lower above the first polyimide layer. The flexible metal-clad laminate according to the present invention can have excellent adhesion between the polymer film and the metal conductive layer, a low dimensional change, and a low production cost, because of superior casting workability, even though the thickness of polyimide becomes increased.

Abstract: Disclosed herein is an organic electroluminescent polymer having 9,9-di(fluorenyl)-2,7-fluorenyl unit and an electroluminescent device using the same. Specifically, the current invention provides an organic electroluminescent polymer having 9,9-di(fluorenyl)-2,7-fluorenyl unit, which can be used as a blue electroluminescent polymer and host material by introducing the substituted fluorenyl group at the 9-position of fluorene, and an electroluminescent device using the electroluminescent polymer. The electroluminescent polymer is applicable as a host material for highly pure blue, green and red, having high solubility, high heat stability and high quantum efficiency.

Abstract: Disclosed are an oxygen barrier resin composition and products containing the resin. The resin composition comprises 20 to 80 wt % of an ethylene-vinyl alcohol copolymer, 5 to 79 wt % of an ethylene copolymer, and 1 to 30 wt % of a compatibilizer obtained between a random copolymer of ethylene-maleic anhydride-alkyl(meth)acrylate and a polyamide oligomer ranging, in molecular weight, from 1,000 to 5,000. The compatibilizer functions in such a way that the main chain of the polyamide penetrates into the ethylene-vinyl alcohol phase while the main chain of the ethylene-alkyl(meth)acrylate exists in the ethylene copolymer phase. The resin composition is superior in both melt-moldability and compatibility, providing films, sheets or bottles with superb appearance (transparency), mechanical strength and oxygen barrier.