Abstract: A radio-frequency (RF) responsive tag comprising a heat-sealing substrate comprising a polyester layer, and an antenna comprising a pattern of conductive material wherein said conductive material is in direct contact with a heat-sealing surface of the substrate, and wherein the shrinkage of the heat-sealing substrate is less than 5% at 190° C. over 30 minutes; a method of manufacture of said RF-response tag.

Abstract: A radio-frequency (RF) responsive tag comprising a heat-sealing substrate comprising a polyester layer, and an antenna comprising a patter of conductive material wherein said conductive material is in direct contact with a heat-sealing surface of the substrate, and wherein the shrinkage of the heat-sealing substrate is less than 5% at 190° C. over 30 minutes; a method of manufacture of said RF-response tag.

Abstract: A laminated polyester film excellent in blocking resistance and processing suitability and exhibiting excellent electromagnetic transducing characteristics and excellent travel durability, when processed into a magnetic recording medium, and an electromagnetic recording medium using the laminated polyester film as a base film, are provided. This laminated polyester film comprises a polyester layer B containing a cyclic trimer in an amount of not more than 0.8 percent by weight, having a terminal carboxyl group concentration of not more than 35 eq/106 g and containing inactive particles B having an average particle diameter of 50 to 100 nm, and a polyester layer A laminated to one side of the polyester layer B and not containing inactive particles or containing inactive particles A having a smaller average particle diameter than that of the inactive particles B.

Abstract: A biaxially oriented laminate polyester film for magnetic recording medium, which is a laminate film comprising a base layer (A) formed of a polyester resin and a coating layer (B) which exists on one surface of the base layer (A) and contains a binder resin, added fine particles and a surfactant, wherein the base layer (A) is a biaxially oriented film which substantially contains no fine particles added or contains 0.001 to 0.1% by weight of added fine particles having an average particle diameter of 0.005 to 0.3 &mgr;m, the coating layer (B) has a surface having a central plane roughness (SRa) of 5 nm or less, the surface of the coating layer (B) has protrusions having a major diameter of 0.05 &mgr;m or more in a density of 80,000 pieces/mm2 or less and has extra-large protrusions having a major diameter of 10 &mgr;m or more in a density of 20 pieces/cm2 or less.

Abstract: A biaxially oriented polyester film to be laminated on a metal plate and molded, which comprises an aromatic polyester composition comprising: (A) an aromatic polyester which comprises ethylene terephthalate as the main recurring unit and a titanium compound and a phosphorus compound both of which satisfy at least one of the following expressions (1) and (2): 0.1≦Ti/P≦3.0  (1) 5≦Ti+P≦60  (2) wherein Ti is the amount (mmol %) of elemental titanium of the titanium compound contained in this aromatic polyester and P is the amount (mmol %) of elemental phosphorus of the phosphorus compound contained in the aromatic polyester, and the following expression (3): 2≦Ti≦20  (3) wherein Ti is as defined hereinabove, and which contains alkali metal compounds, germanium compound and antimony compound in a total amount of not more than 3 ppm in terms of the total of elemental alkali metals, elemental germanium and elemental antimony; and (B) 0.05 to 5.

Abstract: A laminated polyester film excellent in blocking resistance and processing suitability and exhibiting excellent electromagnetic transducing characteristics and excellent travel durability, when processed into a magnetic recording medium, and an electromagnetic recording medium using the laminated polyester film as a base film, are provided.

Abstract: An aromatic polyester film, which comprises an aromatic polyester comprising 2,6-naphthalenedicarboxylic acid as the main dicarboxylic acid component and 1,3-propanediol as the main diol component and having a density of at least 1.310 g/cm3. A laminated film comprising another polyester layer can be formed from this aromatic polyester film. An aromatic polyester containing a small amount of a sulfonic acid phosphonium salt used as one of the aromatic polyesters forming this laminated film is excellent in electrostatic casting properties and resistance to the contamination of an electrostatic wire, and an aromatic polyester containing an inorganic anti-fungus agent is used for antifungal application.

Abstract: A biaxially oriented polyester film to be laminated onto a metal plate and molded, (A) which comprises a copolyester comprising (a) terephthalic acid in an amount of 82 to 100 mol % and 2,6-naphthalenedicarboxylic acid or a combination of 2,6-naphthalenedicarboxylic acid and other dicarboxylic acid in an amount of 0 to 18 mol % of the total of all dicarboxylic acid components and (b) ethylene glycol in an amount of 82 to 100 mol % and cyclohexanedimethanol or a combination of cyclohexanedimethanol and other diol in an amount of 0 to 18 mol % of the total of all diol components, having (c) a glass transition temperature of 78° C. or more and (d) a melting point of 210 to 250° C., and containing (e) porous silica particles with a pore volume of 0.5 to 2.0 ml/g which are agglomerates of primary particles having an average particle diameter of 0.001 to 0.1 &mgr;m; and (B) which has the following relationship between the highest peak temperature (Te, °C.

Abstract: A thermoplastic resin composition containing inorganic particles, wherein (i) the inorganic particles have pore volume of 0.1 to 3 ml/g and (ii) the inorganic particles are treated at the surfaces with a hydrophilic polyester of 0.05 to 10 times the weight of the inorganic particles or with a silicon-containing organic compound. This composition can be obtained by feeding a dispersion of the above-mentioned surface-treated inorganic particles into a vented double-screw kneader and extruder to mix it with a thermoplastic resin.

Abstract: A biaxially oriented polyester film to be molded and laminated with a metal sheet which shows excellent moldability when it is laminated with a metal sheet and subjected to a can making process such as drawing and from which a metal can such as a drink can or food can having excellent heat resistance, retort resistance, taste and odor retention properties, impact resistance and corrosion preventing properties can be produced. This polyester film is produced from a copolyester which contains porous particles having an average particle diameter of 0.1 to 2.5 &mgr;m, a pore volume of 0.05 to 2.5 ml/g, a specific surface area of 50 to 600 m2/g and a compressive resistance of 1 to 100 MPa and has a glass transition temperature of 70° C. or higher and lower than 78° C., a melting point of 210 to 250° C. and an intrinsic viscosity of 0.50 to 0.80 dl/g.

Abstract: A polyalkylene naphthalate for a film, which comprises a naphthalenedicarboxylic acid component as a main dicarboxylic acid component and an aliphatic glycol component as a main glycol component, and contains (a) an antimony compound and (b) a quaternary phosphonium sulfonate compound unit having an ester-forming functional group in such amounts that satisfy the following expressions (1) and (2): 0<Sb≦80  (1) 0<S/Sb≦0.4  (2) wherein Sb and S are the molar ratios (mmol %) of the antimony compound and the quaternary phosphonium sulfonate compound unit having an ester-forming functional group to the total of all the dicarboxylic acid components forming the polyalkylene naphthalate, respectively. The film of the present invention has excellent surface flatness and is suitable for use as a base film for a magnetic recording medium. It is also excellent in high-speed winding properties and can be formed into a film stably and produced industrially advantageously.

Abstract: A biaxially oriented polyester film to be laminated onto a metal plate and molded, which comprises a copolyester, said copolyester comprising (a) terephthalic acid in an amount of 82 to 100 mol % and 2,6-naphthalenedicarboxylic acid or a combination of 2,6-naphthalenedicarboxylic acid and other dicarboxylic acids in an amount of 0 to 18 mol % of the total of all dicarboxylic acid components and (b) ethylene glycol in an amount of 82 to 100 mol % and cyclohexanedimethanol or a combination of cyclohexanedimethanol and other diols in an amount of 0 to 18 mol % of the total of all diol components, and having (c) a glass transition temperature of 78.degree. C. or higher and (d) a melting point of 210 to 250.degree. C. The said film has the following relationship between the highest peak temperature (Te, .degree. C.) of loss elastic modulus and the glass transition temperature (Tg, .degree. C.): Te-Tg.ltoreq.30, or its content of a free dicarboxylic acid diol ester is 50 ppm or less.

Abstract: A laminate polyester film to be laminated onto metal plate and molded comprises the first layer made from copoly(ethylene-terephthalate/isophthalate) having a melting point of 205 to 250.degree. C. and a second layer made from a polyester (i) comprising ester units of an aromatic dicarboxylic acid component, an aliphatic dicarboxylic acid component and aliphatic diol components, (ii) containing a titanium compound soluble in the polyester in an amount of 30 to 200 ppm in terms of elemental titanium and (iii) having one or two melting point(s) in the range of 170 to 245.degree. C., and has the maximum peak temperature of loss elastic modulus of higher than 47.degree. C. and 85.degree. C. or lower. This laminate polyester film is suitably used for application such as metal cans for juice and other refreshing drinks that are handled in a cooled state.

Abstract: A biaxially oriented film which is made substantially of (1) a polyethylene naphthalate copolymer comprising an ethylene naphthalate unit in an amount of 92 to 99.5 mol % based on all recurring units and at least one copolymer component selected from the group consisting of (a) a glycol having a fluorene skeleton in the molecule, (b) p-hydroxymethylbenzoic acid, (c) p-hydroxyethoxybenzoic acid and (d) p-hydroxyethoxyethoxybenzoic acid in an amount of 0.5 to 8 mol % based on the total of all dicarboxylic acid components, and which has (2) Young's moduli in both longitudinal and transverse directions of 500 kg/mm.sup.2 or more and (3) a delamination resistance of 10% or less in terms of fold line whitening ratio. Since this biaxially oriented film of the present invention is excellent in delamination resistance, curling resistance, mechanical strength, color and transparency, it is of great value as a base film for a photo film.

Abstract: A process for producing an aromatic polyester by esterifying a dicarboxylic acid mainly composed of an aromatic dicarboxylic acid and a glycol mainly composed of ethylene glycol in the presence of 1 to 30 mmol %, based on the dicarboxylic acid, of a quaternary phosphonium sulfonate having ester-forming functional group(s), and then polycondensing the resulting product.

Abstract: A laminated polyester film comprises: a first layer formed of a first aromatic copolymer having a terminal carboxyl group centration of 10 to 35 equivalent/10.sup.6 g; and a second layer of a molten blend having a terminal carboxyl group concentration of 40 to 80 equivalent/10.sup.6 g, which comprises a second aromatic polyester containing ethylene terephthalate as a main recurring unit and a third aromatic polyester containing tetramethylene terephthalate as a main recurring unit. The laminated polyester film exhibits excellent moldability when a metal plate laminated therewith is deep drawn, and is excellent in impact resistance and flavor retaining property after can making.