Abstract: The present invention relates to a biaxially stretched polyester film comprising a polyester layer A which comprises polybutylene terephthalate and at least one of a copolyester and an amorphous polyester, said biaxially stretched polyester film satisfying any one of the following requirements: (1) the polyester layer A exhibiting one melting point as measured by temperature-rise DSC method, and the polyester film having an edge tear resistance of not more than 100 N in each of longitudinal and width directions thereof; and (2) an average number of uncompatilized polybutylene terephthalate masses having a maximum length of not less than 1 ?m which are present in a section of the layer A is not more than 1.0 per 100 ?m2 of the section of the layer A, and the polyester film having an edge tear resistance of not more than 100 N in each of longitudinal and width directions thereof.

Abstract: A near infrared ray absorbing filter is a film gained by biaxially oriented polyester having a near infrared ray absorbing agent, and the melting point of this polyester is no higher than 230° C. The optical filter for a plasma display is provided with a near infrared ray blocking layer made of polyester containing a near infrared ray absorbing agent and an image quality correcting layer made of polyester containing a compound which absorbs visible light having an absorption maximum wavelength in a range from 560 nm to 600 nm. These layers are layered through an integrated process by means of a co-extrusion method, according to which these layers are melted and extruded together from a co-extrusion process, and thus, a biaxially oriented film is formed. The melting point of the polyester in these layers is no higher than 230° C.

Abstract: The present invention relates to a coated film comprising a polyester film and a coating layer provided on one side thereof, which coating layer is formed by applying a coating solution containing at least one binder resin (A), a polycarbodiimide compound (B) and a melamine compound (C).

Abstract: A biaxially stretched laminated polyester film having tensile break strengths in the machine and transverse directions of 40 to 200 MPa, and satisfying at least one of the following items: (1) wetting tension of at least one side of the film is not less than 48 mN/m; (2) surface resistivity of at least one side of the film is not more than 5×1012 ?/?; and (3) a barrier layer is provided on at least one side of the film. Such a film is suited for use as a composing material of packages for industrial materials, medicines, hygienic materials, foods, etc., and is also suited as a packaging material which excels in printing ink adhesion and also has excellent laminating compatibility with other materials, antistatic gas barrier properties and hand cutting quality.

Abstract: A biaxially oriented laminated polyester film which is a co-extruded laminated polyester film comprising at least three polyester layers with the intermediate layer containing a dye which is substantially dissolved in polyesters, said film having on one side thereof a resin layer containing metal-added metal oxide particles or metal oxide particles. This film is capable of preventing precipitation of the dye on the film surface, excels in heat insulation and aesthetic effect in use, and is suited for application to windows.

Abstract: The present invention relates to a biaxially stretched polyester film comprising a polyester layer A which comprises polybutylene terephthalate and at least one of a copolyester and an amorphous polyester, said biaxially stretched polyester film satisfying any one of the following requirements: (1) the polyester layer A exhibiting one melting point as measured by temperature-rise DSC method, and the polyester film having an edge tear resistance of not more than 100 N in each of longitudinal and width directions thereof; and (2) an average number of uncompatilized polybutylene terephthalate masses having a maximum length of not less than 1 ?m which are present in a section of the layer A is not more than 1.0 per 100 ?m2 of the section of the layer A, and the polyester film having an edge tear resistance of not more than 100 N in each of longitudinal and width directions thereof.

Abstract: A biaxially oriented laminated polyester film which is a co-extruded laminated polyester film comprising at least three polyester layers with the intermediate layer containing a dye which is substantially dissolved in polyesters, said film having on one side thereof a resin layer containing metal-added metal oxide particles or metal oxide particles. This film is capable of preventing precipitation of the dye on the film surface, excels in heat insulation and aesthetic effect in use, and is suited for application to windows.

Abstract: An object of the present invention is provide a polyester film useful as base for release film according to which when a ceramic slurry is applied on the release film, formation of pinholes in the ceramic slurry layer is suppressed prominently, and also when a ceramic layer is provided on the release film, thickness variation of the ceramic layer is lessened, thus realizing excellent releasability of the release film. A polyester film for release film, which has a maximum height of projection (Rmax) in one surface (surface A) of said polyester film, of not more than 500 nm; and has a thickness variation of not more than 5%.

Abstract: A base for polarizing plate protective film, which base is stuck on the surface of a polarizing plate of a liquid crystal display board, comprises a biaxially oriented polyester film having a coating layer on one surface thereof and has such properties that: the surface resistance of said coating layer is not higher than 1×1011 ?, the adhesive force (P2) of the acrylic adhesives to the coating layer surface is not more than 3,000 mN/cm, the difference (P1-P2) between the adhesive force (P1) of the rubber adhesives to the coating layer surface and the adhesive force (P2) of the acrylic adhesives is not less than 100 mN/cm, and the film haze is not higher than 2%. Such a polarizing plate protective film base excels in antistatic properties, chemical resistance, scratch resistance, handling quality, transparency, etc.

Abstract: The present invention relates to a polyester film for display comprising: a polyester film substrate containing an ultraviolet light absorber; and a coating layer formed on at least one surface of said polyester film substrate, said polyester film having a haze of not more than 2.0% and a light transmittance at 380 nm of not more than 5.0%.

Abstract: The present invention relates to a polarizing plate protective film base comprising a laminated film comprising a biaxially oriented polyester film and a coating layer provided on one side of said biaxially oriented polyester film, the surface resistance of said coating layer being not more than 1×1011?, the adhesive force (P2) of the coating layer surface with an acrylic adhesive being not more than 3,000 mN/cm, and the difference between adhesive force (P1) of the coating layer surface with a rubber adhesive and adhesive force (P2) with an acrylic adhesive (P1?P2) being not less than 100 mN/cm.

Abstract: The present invention relates to an infrared filter comprising a biaxially oriented co-extruded film having at least three polyester layers comprising an intermediate polyester layer and the surface polyester layers on both sides of the said intermediate layer, said intermediate layer containing a near infrared absorber having an absorption peak at 800 to 1,100 nm in an amount of 0.1 to 10% by weight based on the weight of the intermediate layer, the light transmittance of said film being not higher than 30% at 950 nm, and the average center line roughness (Ra) of the film surface on at least one side being 10 to 30 nm.

Abstract: The present invention relates to a coated film comprising a polyester film having a coat on at least one side thereof, obtained by applying on at least one side of a polyester film a coating solution containing (1) a self-emulsifiable isocyanate having repeating units of ethylene oxide and two or more isocyanate groups, and (2) at least one polymer selected from the group consisting of polyesters, polymers of vinyl monomers and polyurethanes, then drying and stretching the coated film.

Abstract: The present invention relates to a polyester film for medicine wrapper or powder food wrapper having a surface resistivity of not more than 5×1012 &OHgr;/cm2.

Abstract: The present invention relates to a release film comprising: a polyester film; a coating layer formed on one surface of said polyester film; and a release layer formed on a surface of said coating layer which exhibits a residual adhesion rate of not less than 80%, said release film satisfying all of the conditions represented by the following formulae (1) to (3): OL≦0.6 (1) TL≧80 (2) TL(H)≦8 (3)  wherein OL is an amount (mg/m2) of oligomers extracted with dimethylformamide from a surface of said release layer after the release film is heat-treated at a temperature of 180° C. for 10 minutes; TL is a total light transmittance (%) of said release film; and TL(H) is a total light transmittance (%) of a laminate prepared by interposing said release film between two polarizing plates disposed in a perpendicular relation to each other.

Abstract: The present invention relates to a polarizing plate protective film base comprising a laminated film comprising a biaxially oriented polyester film and a coating layer provided on one side of said biaxially oriented polyester film,

Abstract: The present invention relates to a biaxially oriented polyester film having at least one layer of a sea-island structure which satisfies the following formulae (1) and (2) at the same time, said film having a specific surface resistance of not more than 1×1015 &OHgr;: 50≦X/Y  (1) 5≦N≦200  (2) wherein X is the mean value of length (&mgr;m) of the islands in the longitudinal direction of the film; Y is the mean value of length (&mgr;m) of the islands in the width direction of the film; and N is the number (per &mgr;m2) of the islands existing in the section of the film in its width direction.

Abstract: The present invention relates to a coated film comprising a polyester film having a coat on at lest one side thereof, obtained by applying on at least one side of a polyester film a coating solution containing (1) a self-emulsifiable isocyanate having repeating units of ethylene oxide and two or more isocyanate groups, and (2) at least one polymer selected from the group consisting of polyesters, polymers of vinyl monomers and polyurethanes, then drying and stretching the coated film.

Abstract: The present invention relates to a primer coated polyester film for imaging media which has a thickness of 40 to 200 &mgr;m, a haze of not more than 5%, and comprises a biaxially oriented polyester film support and at least one priming layer laminated on the support and oriented at least monoaxially. The priming layer is formed from a coating solution containing a water-soluble resin (A) having vinyl alcohol units as a main constituent and a water-soluble or water-despersible resin (B) having an aromatic polyester unit.

Abstract: The present invention relates to a film for ink jet recording sheet comprising: a polyester film, a coating layer on the polyester film formed by applying a coating solution containing a polymer (A) having oxazoline groups on the surface of the polyester film, then drying and stretching the film, and an ink jet image receiving layer on the coating layer.