Abstract: A high-quality cellulose acylate film and saturated norbornene resin film which are produced by a melt film formation method and can be inhibited from having steak failures. Also provided is a process for producing the cellulose acylate film or the saturated norbornene resin film. The process, which is for producing a cellulose acylate film (12) or a saturated norbornene resin film, comprises melting a cellulose acylate resin or saturated norbornene resin with an extruder (22), feeding the molten resin to a die (24) through a piping (23), and ejecting the melt in a sheet form from the die (24) onto a cooled support (26) which is running or rotating to thereby cool and solidify the sheet. Thus, a cellulose acylate film (12) or saturated norbornene resin film is formed. In the process, a static mixer (27) is disposed in the piping (23) and the molten resin flowing in the piping (23) is statically stirred.

Abstract: An aspect of the present invention provides a method for producing a saturated norbornene resin film by melt film-forming method comprising discharging a molten resin molten in an extruder in a form of a sheet onto a traveling or rotating cooling support from a die so as to be solidified by cooling, wherein the molten resin discharged from the die is subjected to a close contact treatment which allows only the both end parts of the full width of the molten resin to closely contact to the cooling support. According to the aspect, a close contact treatment which allows only the both end parts of the full width of the molten resin discharged from the die to closely contact to the cooling support is conducted in the melt film-forming of a saturated norbornene resin film, a saturated norbornene resin film having an excellent surface quality without the surface quality defects such as step irregularities can be produced.

Abstract: A method of producing a thermoplastic film, which can increase uniformity of Re and Rth of a thermoplastic film obtained by stretching, and which can provide a thermoplastic film having few display irregularities when the film is incorporated into a liquid crystal display device as a retardation film, and a thermoplastic film produced by the method are provided. In a tenter, both ends in the width direction of the film are held with clips and the film is simultaneously stretched in the traveling direction A and the width direction B. By this, a thermoplastic film in which the number of adhesion marks is 10 marks/m2 or less, the in-plane retardation Re is 0 nm to 500 nm and the retardation Rth in the thickness direction is 30 nm to 500 nm is produced.

Abstract: According to the present invention, the film is cooled little by little by controlling the surface temperature of the cooling drums so that the surface temperature of the cooling drums downstream is lower than that of the cooling drums upstream, whereby it is prevented from slipping and shrinking on the surface of the cooling drums. Thus, defects can be prevented from occurring in the film, whereby a high-quality thermoplastic film for optical applications can be produced.

Abstract: The present invention provides a method for producing a thermoplastic film which makes it possible to improve the optical properties of the thermoplastic film obtained by stretching and a thermoplastic film manufactured thereby. The transverse stretching section in which a cellulose acylate film is transversely stretched includes: a preheating zone, a transverse stretching zone, a cooling zone and a thermal relaxation zone, and the cellulose acylate film having been cooled in the cooling zone is immediately subjected to thermal relaxation treatment in the thermal relaxation zone.

Abstract: A thermoplastic film is transversely stretched, and then transported in a heat-treating zone (46) such that the ratio (GID) of an inter-roll distance (G) to a roll lap length (D) is 0.01 to 3, and the ratio (V2/V1) of an exit-side transporting speed (V2) to an entry-side transporting speed (V1) is 0.6 to 0.999. The thermoplastic film is heat-treated in the heat-treating zone (46) at (Tg?20)° C. to (Tg+50)° C., in which Tg is the glass transition temperature of the film. The heat-treated thermoplastic film exhibits an Rth/Re ratio of at least 0.5 and less than 1, an Rth/Re ratio range of 0.01 to 0.1 in the width direction, and a thermal dimensional change of 0.001% to 0.3% under conditions of 80° C. and 200 hours.

Abstract: Provided is a cellulose acylate film formed through melt casting that is capable of being built in liquid-crystal display devices to solve the display trouble at the time of black level of display. That is a cellulose acylate film formed through melt casting, in which the number of polarizing minor impurities is from 0 to 10/mm2 and the number of black impurities is from 0 to 10/mm2, and which has a transmittance at 450 nm (T450) of from 90 to 100%.

Abstract: It is an object to provide a method of manufacturing a thermoplastic film capable of improving optical properties of the thermoplastic film obtained by drawing it and to provide the thermoplastic film. In a transverse drawing process part 30 for drawing a thermoplastic film 16 in a transverse direction is constituted by a preheating zone T1 and transverse drawing zones T2, T3 and cooling zones T4, T5, and the steps of the transverse drawing zone T3 and performed thereafter (cooling zone T4 and T5) are maintained at a glass transition temperature Tg or less. The temperature of the preheating zone T1 is set to be higher than that of the cooling zone T4 and falls within the range of ?10 C to +30 C relative to those of the transverse drawing zones T2 and T3.

Abstract: The present invention provides a method for producing a cellulose acylate film comprising: a foreign matter evaluation step for arbitrarily extracting a part of a cellulose acylate resin, which is a raw material before being melted by an extruder, melting the part of raw material to prepare a sample with a thickness of 300 ?m or less, and observing the sample by a polarization microscope to evaluate whether the sample has the number of foreign matters of 30 pieces/mm3 or less; a resin supply step for placing into the extruder a raw material selected by the foreign matter evaluation step as the raw material having the number of foreign matters of 30 pieces/mm3 or less; an extrusion step for melting the raw material by the extruder and extruding the raw material as a molten resin into a pipe for supply to a die; and a film formation step for discharging the molten resin extruded to the pipe from the die onto a traveling or rotating cooling support in a form of sheet to cool and solidify the sheet.

Abstract: A method is provided for manufacturing a wide band retardation plate which gives uniform phase difference characteristics to incident light over the whole visible wavelength region, and which, as it permits selection of raw materials regardless of whether they have a positive or negative intrinsic double refraction value, allows a wide selection of raw materials.

Abstract: An unstretched cellulose acylate film hardly breakable upon stretching can be produced by melt film forming and as a result, a highly oriented stretched cellulose acylate film can be obtained. Using an extruder with a screw compression ratio of 2.5 to 4.5 and an L/D of 20 to 50, a cellulose acylate resin is extruded into a sheet at an extrusion temperature of 190° C. to 240° C. from a die to a cooling drum, and solidified by cooling to prepare an unstretched cellulose acylate film 16, which is then stretched to produce a stretched cellulose acylate film.

Abstract: The present invention provides a method for producing a cellulose acylate resin film, comprising the step of, melting a cellulose acylate resin in an extruder and extruding the molten cellulose acylate resin to a die, wherein the step of melting is carried out using a tandem extruder having a first-stage extruder and a second-stage extruder connected in tandem, in order to prevent discoloration and thickness non-uniformity make the film seriously defective for use as an optical film. Because the resin in the form of a powder or flakes is once pelletized in a pelletizing extruder, and then the pellets are melt-extruded in an extruder. This promotes discoloration of the resin, disadvantageously.

Abstract: According to the present invention, a cellulose acylate film difficult to be broken even if the stretching ratio is increased upon stretching and whose retardation (Re) is easily controllable to a desired value can be produced by melt film forming. Accordingly, a stretched cellulose acylate film highly oriented and having an appropriate retardation (Re) required from liquid crystal display device manufacturers can be produced.

Abstract: A cellulose acylate film showing 10 marks/M2 or less of adhesion marks and having an in-plane retardation value (Re value) of 0 to 200 nm and a retardation value along the thickness direction (Rth value) of 30 to 500 nm. The cellulose acylate film shows favorable optical uniformity and can provide an improved liquid crystal display.

Abstract: Disclosed is a cellulose acylate film produced according to a melt casting process and having an Re unevenness of from 0 to 10%. When built in a liquid-crystal display device, the film significantly solves the problem of display unevenness and humidity-dependent visibility change.

Abstract: A method is provided for manufacturing a wide band retardation plate which gives uniform phase difference characteristics to incident light over the whole visible wavelength region, and which, as it permits selection of raw materials regardless of whether they have a positive or negative intrinsic double refraction value, allows a wide selection of raw materials.

Abstract: This invention provides a method of producing a biaxially stretched polyester film with regulating casting conditions of a polyester film at a high speed so as not to induce surface defects caused by entrapping air microbubbles between a cooling drum and a molten resin sheet, and regulating longitudinal stretching conditions and lateral stretching conditions. The biaxially stretched polyester film is excellent in small thickness variation, resistance to cleavage and improvement in bowing phenomenon, and is particularly suitable for the support of a photographic film.

Abstract: The present invention improves the bowing phenomenon of a biaxially stretched polyester film which comprises stretching the longitudinally stretched cast film laterally at a temperature higher than the glass transition temperature of the polyester film from by 5° C. to by 50° C., staying the laterally stretched film in an intermediate zone for a period from 3 to 30 seconds which has been controlled at a temperature from higher than the lateral stretching temperature by 20° C. or more to lower than a heat setting temperature by 20° C. or less, and then heat-setting at the heat setting temperature which is lower than the melting point of the polyester film from by 30° C. to by 5° C.

Abstract: A photographic support having good adhesion to a photographic emulsion layer formed thereon without physical surface modification. The support comprises a uniaxially or biaxially stretched polyester film and has at least (1) a main layer containing a polyester and (2) one or two surface layers. At least one of the surface layers comprises a substantially noncrystalline polyester. Furthermore, when used in the form of a roll film, substantially no curling of the support remains upon development.