Abstract: The present invention is a multilayer polyester film comprising a layer A and a layer B which are laminated alternately, the layer A constituting the outermost layer on both sides of the film, wherein (1) the layer A comprises a polyester A, and the layer B comprises a polyester B, (2) the melting point of the polyester A is higher than the melting point of the polyester B by at least 15° C., (3) the layer A is a layer having an oriented structure, and the layer B is a layer having a substantially unoriented structure, (4) the ratio (a/b) of the total thickness (a) of the layer A to the total thickness (b) of the layer B is 0.01 to 3, and (5) the in-plane tensile strength of the multilayer polyester film is 50 MPa or lower at a maximum, and the difference between its maximum value and minimum value is 20 MPa or smaller; and a method for producing the multilayer polyester film.

Abstract: An ultraviolet radiation absorbent for thermoplastic polymer materials such as polyethylene terephthalate or polycarbonate contains cyclic imino ester compound of a specified structure in an amount of over 99.5 weight % and less than 100 weight % and having an acid value in the range of 1×10?3–1 and/or a chlorine ion content in the range of 1×10?1–1×103 ppm.

Abstract: An ultraviolet radiation absorbent for thermoplastic polymer materials such as polyethylene terephthalate or polycarbonate contains cyclic imino ester compound of a specified structure in an amount of over 99.5 weight % and less than 100 weight %, having the melt beginning temperature obtained by melting point measurement in differential thermal analysis within the range of 300–310° C. and/or the weight loss beginning temperature obtained by thermogravimetric measurement within the range of 270–305° C.

Abstract: There is provided a laminated film for optical use comprising a polyester film which has a lubricity layer containing globular particles in at least one side thereof, wherein the laminated film has a thickness irregularity of 0.5 to 7.0%, and wherein the polyester film contains inert particles derived from catalysts and the amount of the inert particles determined by a dark-field microscopy satisfies the following conditions: the number of inert particles having a particle size of from 1 to 10 ?m is 200 to 20,000/mm2; and the number of inert particles having a particle size of greater than 10 ?m is 10/mm2 or less. The laminated film for optical use which is improved in uniformity, transparency, lubricity, color tone and scratch resistance, which deposits only a reduced amount of low molecular materials, and which is excellent in the adhesion to a layer adopted for various optical purposes.

Abstract: An optical adhesive polyester film comprising (A) a polyester film layer containing an aromatic polyester and an ultraviolet absorber and (B) a coating formed on at least one surface of the polyester film (A). The coating (B) contains at least one polymer selected from the group consisting of a coating polyester having a glass transition point of 40 to 100° C. and an acryl polymer having a glass transition point of 20 to 80° C. in an amount of 50 to 95% by weight based on the coating. The optical adhesive polyester film is disposed on the front of a plasma display so as to block externally incoming ultraviolet light.

Abstract: An ultraviolet radiation absorbent for thermoplastic polymer materials such as polyethylene terephthalate or polycarbonate contains cyclic imino ester compound of a specified structure in an amount of over 99.5 weight % and less than 100 weight % and having an acid value in the range of 1×10?3-1 and/or a chlorine ion content in the range of 1×10?1-1×103 ppm.

Abstract: An ultraviolet radiation absorbent is produced by a method including specified Step A, Step B and Step C. Step A is a process of causing an amidation of anthranilic acid and terephthaloyl dichloride in the presence of a solvent and an alkali to generate N,N?-bis(o-carboxyphenylterephthalamid) and separating a solid component containing N,N?-bis(o-carboxyphenylterephthalamid) generated by this amidation. Step B is a process of separating a solid component containing cyclic imino ester compound of a specified kind. Step C is a process of processing the solid component separated in Step B with an alkaline solution and further washing with water to obtain the ultraviolet radiation absorbent for thermoplastic polymers containing cyclic imino ester compound of the specified kind.

Abstract: The present invention is a multilayer polyester film comprising a layer A and a layer B which are laminated alternately, the layer A constituting the outermost layer on both sides of the film, wherein (1) the layer A comprises a polyester A, and the layer B comprises a polyester B, (2) the melting point of the polyester A is higher than the melting point of the polyester B by at least 15° C., (3) the layer A is a layer having an oriented structure, and the layer B is a layer having a substantially unoriented structure, (4) the ratio (a/b) of the total thickness (a) of the layer A to the total thickness (b) of the layer B is 0.01 to 3, and (5) the in-plane tensile strength of the multilayer polyester film is 50 MPa or lower at a maximum, and the difference between its maximum value and minimum value is 20 MPa or smaller; and a method for producing the multilayer polyester film.

Abstract: There is provided a laminated film for optical use comprising a polyester film which has a lubricity layer containing globular particles in at least one side thereof, wherein the laminated film has a thickness irregularity of 0.5 to 7.0%, and wherein the polyester film contains inert particles derived from catalysts and the amount of the inert particles determined by a dark-field microscopy satisfies the following conditions: the number of inert particles having a particle size of from 1 to 10 ?m is 200 to 20,000/mm2; and the number of inert particles having a particle size of greater than 10 ?m is 10/mm2. The laminated film for optical use which is improved in uniformity, transparency, lubricity, color tone and scratch resistance, which deposits only a reduced amount of low molecular materials, and which is excellent in the adhesion to a layer adopted for various optical purposes.

Abstract: A film for releasing a polarizing plate, which has excellent transparency, silicone adhesion and processing work efficiency, and a small orientation angle, contains little optical foreign matter and is hardly scratched. This film comprises a coextruded polyester film comprising at least two layers and a silicone adhesive layer. The coextruded polyester film has a haze value of 4% or less and an orientation angle of 10° C. or less and contains 5 or less flyspecks having a long diameter of 90 ?m or more per 0.3 m2.

Abstract: An ultraviolet radiation absorbent for thermoplastic polymer materials such as polyethylene terephthalate or polycarbonate contains cyclic imino ester compound of a specified structure in an amount of over 99.5 weight % and less than 100 weight % and having an acid value in the range of 1×10−3-1 and/or a chlorine ion content in the range of 1×10−1-1×103 ppm.

Abstract: An ultraviolet radiation absorbent for thermoplastic polymer materials such as polyethylene terephthalate or polycarbonate contains cyclic imino ester compound of a specified structure in an amount of over 99.5 weight % and less than 100 weight % and having an acid value in the range of 1×10−3-1 and/or a chlorine ion content in the range of 1×10−1-1×103 ppm.

Abstract: A biaxially oriented monolayer or multi-layer polyester film which has semi-transmittability and reflectability, contains a pearlescent pigment having an average long diameter of 0.

Abstract: An optical adhesive polyester film comprising (A) a polyester film layer containing an aromatic polyester and an ultraviolet absorber and (B) a coating formed on at least one surface of the polyester film (A). The coating (B) contains at least one polymer selected from the group consisting of a coating polyester having a glass transition point of 40 to 100° C. and an acryl polymer having a glass transition point of 20 to 80° C. in an amount of 50 to 95% by weight based on the coating. The optical adhesive polyester film is disposed on the front of a plasma display so as to block externally incoming ultraviolet light.

Abstract: An ultraviolet radiation absorbent for thermoplastic polymer materials such as polyethylene terephthalate or polycarbonate contains cyclic imino ester compound of a specified structure in an amount of over 99.5 weight % and less than 100 weight %, having the melt beginning temperature obtained by melting point measurement in differential thermal analysis within the range of 300-310° C. and/or the weight loss beginning temperature obtained by thermogravimetric measurement within the range of 270-305° C.

Abstract: An ultraviolet radiation absorbent for thermoplastic polymer materials such as polyethylene terephthalate or polycarbonate contains cyclic imino ester compound of a specified structure in an amount of over 99.5 weight % and less than 100 weight % and having an acid value in the range of 1×10−3-1 and/or a chlorine ion content in the range of 1×10−1-1×103 ppm.

Abstract: A film for releasing a polarizing plate, which has excellent transparency, silicone adhesion and processing work efficiency, and a small orientation angle, contains little optical foreign matter and is hardly scratched.

Abstract: A base Film for a photographic film, wherein (A) the base film is formed of a polyethylene-2,6-naphthalenedicarboxylate copolymer formed from 2,6-naphthalenedicarboxylic acid as a main acid component and ethylene glycol as a main glycol component; (B) a solution of 10 mg/ml of said copolymer in a hexafluoroisopropanol/chloroform mixed solvent having a hexafluoroisopropanol/chloroform weight ratio of 2/3 shows a light transmittance, T.sub.400, of at least 97%/cm at a wavelength of 400 nm; (C) the film has a yellow index, Y.sub.ID, of 5 or less; and (D) the film has a haze value of 2.0% or less.

Abstract: A base film for a photographic film, wherein (A) the base film is formed of a polyethylene-2,6-naphthalenedicarboxylate copolymer formed from 2,6-naphthalenedicarboxylic acid as a main acid component and ethylene glycol as a main glycol component; (B) a solution of 10 mg/ml of said copolymer in a hexafluoroisopropanol/chloroform mixed solvent having a hexafluoroisopropanol/chloroform weight ratio of 2/3 shows a light transmittance, T.sub.400, of at least 97%/cm at a wavelength of 400 nm; (C) the film has a yellow index, Y.sub.ID, of 5 or less; and (D) the film has a haze value of 2.0% or less.

Abstract: A biaxially oriented polyester film which is characterized as follows: (A) it is composed of an aromatic copolyester which is obtained with use of a germanium compound as the polycondensation catalyst, the copolyester having a melting point in the range from 210.degree. to 245.degree. C. and a glass transition temperature not lower than 50.degree. C., (B) it has a refractive index in the thickness direction in the range from 1.505 to 1.55 and a refractive index in the plane direction in the range from 1.61 to 1.66, and (C) it exhibits excellent shaping processability when it is laminated onto a metal sheet and subjected to deep drawing. This film exhibits excellent shaping processability, heat resistance, resistance to embrittlement under retort treatment, and flavor retention and is useful for coating inner and outer surfaces of metal cans such as those containing beverage or food.