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 release polyester film, a release polyester film for protecting a liquid crystal display panel, a polyester film for a protective film and a polyester film for an optical film which each include a polyester layer containing a titanium compound and a phosphorus compound in amounts satisfying the following formulae (1) and (2) at the same time; as well as a polyester film for a release film which includes a polyester layer containing a titanium compound and a phosphorus compound in amounts satisfying the following formulae (1) and (2) at the same time in which a change in an orientation angle in the film is not more than 3°/500 mm, 0<WTi?20??(1) 1?WP?300??(2) wherein WTi represents a content (ppm) of a titanium element in the polyester layer; and WP represents a content (ppm) of a phosphorus element in the polyester layer.

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 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 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;:

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 cover film for dry film resist comprising a base film and at least one wax-containing coating layer on at least one side of a base film, the water droplet contact angle of the surface of said coating layer being not less than 80°.

Abstract: A process for producing a polyester composition, comprising polyester and a metal salt of an aliphatic carboxylic acid, whereby a metal salt and polyester are fed together into a vented extruder as a raw material. The raw material has a specific resistance of not less than 1×107 &OHgr;·cm upon melting and a metal atom concentration of 0.5 to 1,000 ppm based on the polyester composition. This process is industrially useful for producing a polyester composition which can be used to form sheets using an electrostatic pining method.

Abstract: The present invention relates to a micro-cellular laminated polyester film comprising:

Abstract: The present invention relates to a polyester film for a decorative sheet wherein said sheet comprises a picture-printed layer (B) and said polyester film (A) laminated on a substrate, said polyester film containing a color pigment in an amount of 0.1 to 30 weight % based on the weight of said polyester (A), and said polyester film having a color tone which satisfies the color difference &Dgr;E* between said polyester film (A) and the picture-printed layer (B), which is represented by the following formula (1), of not more than 50. &Dgr;E*={(L*A−L*B)2+(a*A−a*B)2+(b*A−b*B)2}½  (1) wherein L*A, a*A and b*A represent color tone values of the polyester film (A) in CIELAB color determination system; and L*B, a*B and b*B represent color tone values of the picture-printed layer (B) in CIELAB color determination system.

Abstract: The present invention relates to a process for producing a polyester film containing a incompatible polymer, comprising: using a vented twin-screw extruder having a material feed port and vents in the cylinder, and melt-extruding a substantially undried polyester together with a polymer incompatible with said polyester, which melt-extruding is conducted under the condition that the content of said incompatible polymer is not less than 1 wt % based on the total output based on unit time (kg/hr), and the total output Q, extruder screw speed N (rpm) and cylinder bore D (mm) satisfy the following formula 2.6×10−6×D2.8≦Q/N≦15.8×10−6×D2.8.

Abstract: A polyester film for a decorative plate of the present invention, comprises at least the said polyester film and a picture printed layer which are in turn laminated over a surface of a substrate, wherein the polyester film has a optical density of 0.1 to 5.0 and longitudinal and transverse heat shrinkage percentages of from −10% to +10% after heat treated at 180° C. for 5 minutes. The polyester film for a decorative plate or a decorative sheet can generate no harmful gases upon burning such as incineration, can produce a picture pattern having a high design value thereon without adverse influence by the color tone of the substrate, and is excellent in dimensional stability.

Abstract: A laminated polyester film is disclosed which contains not more than 0.05% by weight of a fluorescent agent. The film comprises a fine cell-containing polyester film that contains 55 to 95% by weight of polyester and 5 to 45% by weight of an immiscible thermoplastic resin, said fine cell-containing polyester film having a density of 0.40 to 1.30 g/cm.sup.3 and at lest one other polyester. The other polyester film is laminated as an outermost layer on at least one of the surfaces of the fine cell-containing polyester film. It has a density of not less than 0.40 g/cm.sup.3 and not less than 0.01% by weight of a fluorescent whitening agent. The concentration of the fluorescent whitening agent in the other polyester film is higher than that in the fine cell-containing polyester film.

Abstract: A fine cell-containing polyester film of the present invention comprises 70 to 97% by weight of a polyester and 3 to 30% by weight of a thermoplastic resin immiscible with polyester and produced by stretching at least one direction, the difference in gloss between opposite surfaces of said polyester film being not less than 3%, and a gloss of one surface of said polyester film being not less than 25%. Such a fine cell-containing polyester film is excellent in gloss, printability, transport property and/or flexibility.

Abstract: The present invention relates to a polyester film for decorative plate or decorative sheet, which comprises a base polyester film and a coating layer formed on at least one surface of said base polyester film, wherein said polyester film for decorative plate or decorative sheet has an optical density of 0.1 to 5.0, a b value of not less than -0.5 and longitudinal and transverse heat shrinkage percentages of not less than -10.0% and not more than +10.0% after said polyester film for decorative plate or decorative sheet is heat-treated at 180.degree. C. for 5 minutes.

Abstract: A polyester film for a decorative plate of the present invention, comprises at least the said polyester film and a picture printed layer which are in turn laminated over a surface of a wood substrate, wherein the polyester film has a optical density of 0.1 to 5.0 and longitudinal and transverse heat shrinkage percentages of from -10% to +10% after heat-treated at 180.degree. C. for 5 minutes wherein the polyester film has a longitudinal and transverse tensile moduli in each direction of less than 600 kg/mm.sup.2. The polyester film for a decorative plate or a decorative sheet can generate no harmful gases upon burning such as incineration, can produce a picture pattern having a high design value thereon without adverse influence by the color tone of the substrate, and is excellent in dimensional stability.

Abstract: The present invention relates to a polyester film for decorative plate or decorative sheet, which comprises a base polyester film and a coating layer formed on at least one surface of said base film, and which has an optical density of 0.1 to 5.0 and longitudinal and transverse heat shrinkage percentages of not less than -10.0% and not more than +10.0% after said film is heat-treated at 180.degree. C. for 5 minutes.

Abstract: The present invention relates to a process for producing a polyester sheet comprising melt-extruding a polyester resin by using a vent-type twin-screw extruder in sheet-wise onto the surface of a rotating chilling drum under the condition satisfying the following formula (1):5.2.times.10.sup.-6 .times.D.sup.2.8 .ltoreq.Q/N.ltoreq.15.8.times.10.sup.-6 .times.D.sup.2.8 (1)wherein D mm represents the inner diameter of the extruder cylinder, Q kg/hr represents the extrusion rate per unit time and N rpm represents the screw number of revolution.

Abstract: The present invention relates to a process for producing a biaxially oriented polyester film. The process is carried out using the following steps: (a) stretching an amorphous film substantially comprising polyethylene terephthalate 1.2 to 4.0 times in the machine direction by single-stage or multi-stage process to obtain a film having an index of birefringence of 1.times.10.sup.-3 to 2.5.times.10.sup.-2 ; (b) stretching the thus obtained film 1.1 to 3.5 times in the machine direction by single-stage or multi-stage process of 3.0.times.10.sup.-2 to 8.0.times.10.sup.-2 without cooling the film to the glass transition temperature thereof or below; (c) cooling the thus obtained film to the glass transition temperature thereof or below; (d) heating the thus obtained film to the glass transition temperature or higher and stretching the film in the machine direction by a single-stage or multi-stage process at a stretching ratio which brings the overall stretching ratio of 4.0 to 9.