Abstract: Disclosed is a biaxially stretched polyester film containing an antimony compound as a catalyst component, and a magnesium compound and a phosphorus compound as additives, in which an amount of metal antimony included in residues on a membrane filter having an average pore diameter of 0.1 ?m, after a solution in which 1 g of the biaxially stretched polyester is dissolved in 5 ml of hexafluoroisopropanol is filtered by the filter, is 10 to 100 mg per 1 kg of the biaxially stretched polyester.

Abstract: A biaxially stretched polyester film for protecting a back surface of a solar cell, containing a polyester resin that is polymerized with addition of a Ti catalyst, a Mg compound, a P compound and a nitrogen-containing heterocyclic compound, and having a volume resistivity at 285° C. is 10×107 ?·cm or less, is improved in hydrolysis resistance and electrostatic adhesion property.

Abstract: Disclosed is a biaxially stretched polyester film containing an antimony compound as a catalyst component, and a magnesium compound and a phosphorus compound as additives, in which an amount of metal antimony included in residues on a membrane filter having an average pore diameter of 0.1 ?m, after a solution in which 1 g of the biaxially stretched polyester is dissolved in 5 ml of hexafluoroisopropanol is filtered by the filter, is greater than 1 mg per 1 kg and less than or equal to 100 mg per 1 kg of the biaxially stretched polyester.

Abstract: A biaxially stretched polyester film for protecting a back surface of a solar cell, containing a polyester resin that is polymerized with addition of a Ti catalyst, a Mg compound, a P compound and a nitrogen-containing heterocyclic compound, and having a volume resistivity at 285° C. is 10×107 ?·cm or less, is improved in hydrolysis resistance and electrostatic adhesion property.

Abstract: An endoscope flexible tube comprises: a tubular structure having flexibility; and a shell layer on an outer peripheral surface of the tubular structure, wherein the shell layer has a two-layer structure including a rigid resin layer of a rigid resin and a soft resin layer of a soft resin, and wherein the two-layer structure is maintained over the entire flexible tube in its length direction.

Abstract: Provided are a multilayer coating apparatus and a multilayer coating method in which an uneven flow can be reduced when two types of resins having different softening points are caused to join together and a wire member is coated therewith. A coating apparatus (10) includes: a first extruder (12) and a second extruder (14); a crosshead (16) for coating a wire member with a resin layer with a double-layer structure; a first nozzle (18) which connects the first extruder (12) and the crosshead (16) to each other; a second nozzle 20 which connects the second extruder (14) and the crosshead (16) to each other; a control unit 22 which controls supply amounts of the first extruder (12) and the second extruder (14); and a heater (24) which heats the second nozzle (20). The second nozzle (20) is longer than the first nozzle (18).

Abstract: A polymerization method for a polyester resin, the method including: an esterification reaction step which includes at least polymerizing an aromatic dicarboxylic acid and an aliphatic diol in the presence of a catalyst containing a titanium compound including an organic chelated titanium complex having an organic acid as a ligand, and adding the organic chelated titanium complex, a magnesium compound, and a pentavalent phosphoric acid ester which does not have an aromatic ring as a substituent, in this order; and a condensation polymerization step of subjecting an esterification reaction product produced by the esterification reaction step to a condensation polymerization reaction.

Abstract: Upon starting continuous extrusion, the temperature of a hard resin and a soft resin is increased in extrusion sections. A screw of the extrusion section of the hard resin is set at high rpm at first. The hard resin reaches a maximum temperature ?(° C.) by heating of friction with the screw, and comes to have high flowability. Upon starting conveyance of an assembly, a large amount of molten hard resin and a small amount of molten soft resin are extruded onto the periphery of a tubular structure. Upon passage of a point A of the tubular structure under annular discharge throats, the extrusion amount of the hard resin starts gradually decreasing, and the extrusion amount of the soft resin starts gradually increasing. Since the temperature of the hard resin starts dropping a short time after the decrease in the extrusion amount, the hard resin maintains the high flowability.

Abstract: An endoscope flexible tube comprises: a tubular structure having flexibility; and a shell layer on an outer peripheral surface of the tubular structure, wherein the shell layer has a two-layer structure including a rigid resin layer of a rigid resin and a soft resin layer of a soft resin, and wherein the two-layer structure is maintained over the entire flexible tube in its length direction.

Abstract: In a coating apparatus, low density polyethylene (122) is flowed in the resin passage (123, 124) between a die (120) and a nipple (121) to form an optical fiber strand having a protective layer (129) on the POF (14). The die (120) and the nipple (121) satisfy the following conditions: D?TA?1.3×D TA?L?4×TA 0.7×TA?TB1?1.3×TA (D1+10) ?m?TB2?(D1+300 ) ?m TA?d?2×TA in which TA (?m) indicates the diameter of the die (120), TB1 (?m) indicates the diameter of the nipple (121), TB2 (?m) is the inner diameter of the nipple (121), D1 (?m) is the diameter of the POF (14), D (?m) is the diameter of the optical fiber strand, and d (?m) is the clearance between the die (120) and the nipple (121).

Abstract: A coating apparatus having a die (30) and a nipple (31) coats a plastic optical fiber (11) with a protective layer (39) formed from a thermoplastic resin (32). The diameter TA (?m) of the die, the outer diameter TB1 (?m) of the nipple, the inner diameter TB2 (?m) of the nipple and the diameter D (?m) of the optical plastic fiber satisfy the following formulae: 20 (?m)?(TA?TB1)?1500 (?m) 20 (?m)?(TB2?D)?600 (?m) 400 (?m)<(TB1?TB2)?1500 (?m) Thereby, the thermoplastic resin (32) is coated on the plastic optical fiber (11) without causing stress distribution to the plastic optical fiber (11).

Abstract: The present invention provides a method for manufacturing laminates comprising the steps of: nipping a running belt-shaped base and a film of thermoplastic resin discharged in a molten state from a die between a nip roller and a cooling roller while coating the base with the resin film whereby the base and the resin film are stuck together; blowing a gas that can permeate the resin film from a gas blast nozzle onto the roller surface of the cooling roller whereby the gas is brought to the position of the nipping by accompanying the rotation of the cooling roller; and intercepting an air that accompanies the rotation of the cooling roller by providing an intercepting member upstream from the position of the gas blowing as viewed in the rotating direction of the cooling roller.