Abstract: The present disclosure relates to a continuous extrusion process for producing a celluloid article including several steps and a celluloid article prepared by the continuous extrusion process.

Abstract: An object of this invention is to provide a cellulose ester film which satisfies the requirement 0.95<plasticizer content of A surface/plasticizer content of B surface<1.05, provided that A surface represents one surface of the cellulose ester film and B surface represents the other surface, has a high sound velocity of the film and is excellent in light leakage and color unevenness, and a film-forming method of this cellulose ester film. The cellulose ester film of the present invention, which contains a cellulose ester, is characterized by satisfying the requirement 0.95<plasticizer content of A surface/plasticizer content of B surface<1.05, provided that A surface represents one surface of the cellulose ester film and B surface represents the other surface, and having a sound velocity along at least one of a film transport direction and the lateral direction at 23.° C. 55% RH of 2.0-2.7 km/s.

Abstract: The present invention provides an optical compensation film, which has excellent visibility such as light leakage, uneven color tone and front contrast, and can simultaneously realize retardation and wavelength dispersion. The optical compensation film is characterized by containing a cellulose ester, the following polymer (a), and the following compound (b). (a) A polymer produced by copolymerizing an ethylenically unsaturated monomer having in its molecule a partial structure represented by Formula (1) with at least one ethylenically unsaturated monomer. (b) An esterified compound produced by esterifying all or a part of OH groups in a compound (A) having one furanose structure or one pyranose structure, or an esterified compound produced by esterifying all of or a part of OH groups in a compound (B) containing nor less than 2 and not more than 12 structures of at least one of a furanose structure or a pyranose structure.

Abstract: The invention relates to film products containing desired levels of active components and methods of their preparation. Desirably, the films disintegrate in water and may be formed by a controlled drying process, or other process that maintains the required uniformity of the film. Desirably, the films may be exposed to temperatures above that at which the active components typically degrade without concern for loss of the desired activity.

Abstract: The invention relates to the film products and methods of their preparation that demonstrate a non-self-aggregating uniform heterogeneity. Desirably, the films disintegrate in water and may be formed by a controlled drying process, or other process that maintains the required uniformity of the film. The films contain a polymer component, which includes polyethylene oxide optionally blended with hydrophilic cellulosic polymers. Desirably, the films also contain a pharmaceutical and/or cosmetic active agent with no more than a 10% variance of the active agent pharmaceutical and/or cosmetic active agent per unit area of the film.

Abstract: This invention provides a process for producing an optical film, which, even when a film is produced by casting using a melt casting film forming method so that the central part in the widthwise direction is thick, can finally realize a flat film having an even thickness and good flatness and possessing excellent optical properties. The production process of an optical film can meet recent demands for reduced film thickness, increased film width, and improved film quality in protective films for liquid crystal polarizing plates. The production process of an optical film by a melt casting film forming method is characterized in that, in an MD stretching step, an unstretched film after nipping is stretched in a transfer direction (MD direction) of the same film by a factor of not less than 1.1 and not more than 3.

Abstract: Fatty acid is dissolved in a second solvent to prepare a fatty acid solution. The fatty acid solution is added to a dope prepared by dissolving cellulose acylate and a plasticizer in a first solvent. Thereby, a casting dope containing the fatty acid is prepared. The mass of the fatty acid to be added to the dope is in the range of 1×10?4 to 3×10?3 relative to the sum of the mass of the cellulose acylate and the mass of the plasticizer. The casting dope is discharged from a casting die to the circumferential surface of a drum to form a casting film. The casting film is peeled from the drum and dried to be a film.

Abstract: A resin film including a resin and an organic acid represented by the following formula (1), wherein the ratio of the organic acid to the resin is from 0.1 to 20% by mass: X-L-(R1)n??Formula (1).

Abstract: A plurality of substantially conical or pyramidal elements are formed inside a sheet-like binder. The binder has smooth surfaces. The elements and the binder cooperate to refract light incident on a brightness enhancement sheet from a surface on a diffusion sheet side to the other surface in a direction normal to the brightness enhancement sheet. Thus, the front brightness is enhanced. The elements are distributed along one of the surfaces of the brightness enhancement sheet with vertices pointing in one direction toward one of the surfaces. The elements are formed by trapping gas bubbles in the binder and differ in refractive index from the binder.

Abstract: A method of manufacturing an optical film comprising: extruding a melted substance comprising a thermoplastic resin and irregularly shaped particles from a casting die on a support to form the optical film, wherein the casting die is equipped with, in the order from an upstream of an extruding direction of the melted substance: an inlet portion through which the melted substance flows in; a manifold portion; and a slit portion comprising a extending portion and a land portion, the melted substance being ejected from the land portion, wherein cross-sectional shapes of the extending portion satisfies A1<A2 and cross-sectional shapes of the land portion satisfy A3=A4, wherein A1 represents a cross-sectional area at arbitrary position in the extending portion; A2 represents a cross-sectional area at an upstream side position in the extending portion; A3 and A4 represent cross-sectional areas at different positions in the land portion.

Abstract: An optical film characterized by a high degree of flatness that can be used as a phase difference film of a liquid crystal display, and a method for manufacturing this optical film according to melt-casting film forming method. A melt including a cellulose resin is extruded onto a rotary support member 5 (cooling roll) from a flow casting die 4. A rotary pinch member 6 (touch roll) is energized to the rotary support member 5, and a nip is formed between them. When the melt is sandwiched and pressed by the nip, a die line and irregularity in thickness are removed. The linear pressure of the rotary pinch member 6 and the temperature of the melt immediately before the melt is sandwiched and pressed by the nip are set within a predetermined range, whereby effective correction of the film flatness is achieved.

Abstract: A manufacturing method for an optical film via a solution casting method on a transparent substrate film comprising the steps of: (i) ejecting a micro-particle dispersion containing micro-particles having a average particle diameter of at least 25-200 nm as liquid droplets by use of an ink-jet head when a residual solvent content in a web is 5-400 weight %, and (ii) depositing the liquid droplets to adhere onto one side surface of a web and to form a micro convex structure, and further to form 1-10,000 points of convex parts per 10,000 ?m2 having a height of the convex parts of the convex structure of 0.01-0.5 ?m.

Abstract: Disclosed is a method for producing a cellulose ester film wherein a film-forming material containing the following components A-C is heated and melted, and a cellulose ester film is formed therefrom by melt-casting. A: a cellulose resin, B: an ester compound obtained by condensing an organic acid represented by Formula (1) and a polyalcohol, and C: an aliphatic polyester or an aliphatic-aromatic copolymer.

Abstract: An object of this invention is to provide a cellulose ester film which satisfies the requirement 0.95<plasticizer content of A surface/plasticizer content of B surface<1.05, provided that A surface represents one surface of the cellulose ester film and B surface represents the other surface, has a high sound velocity of the film and is excellent in light leakage and color unevenness, and a film-forming method of this cellulose ester film. The cellulose ester film of the present invention, which contains a cellulose ester, is characterized by satisfying the requirement 0.95<plasticizer content of A surface/plasticizer content of B surface<1.05, provided that A surface represents one surface of the cellulose ester film and B surface represents the other surface, and having a sound velocity along at least one of a film transport direction and the lateral direction at 23.° C. 55% RH of 2.0-2.7 km/s.

Abstract: A method for producing an optical film is disclosed. A cellulose ester, a sugar ester prepared by esterification of a sugar compound formed by 1 to 12 of structures selected by a furanose structure and a pyranose structure and an acryl type polymer having a weight average molecular weight of from 5,000 to 30,000 are subjected to melt-casting.

Abstract: Described herein are polymer matrix films, compositions comprising the polymer matrix films, and methods of preparing and using the same.

Abstract: A cellulose ester film has a front retardation Re of from 20 nm to 100 nm relative to light having a wavelength of 590 nm at 25° C. and 60% RH; a retardation Rth in a film thickness direction of from 60 nm to 400 nm relative to light having a wavelength of 590 nm at 25° C. and 60% RH; and a shrinkage factor in a slow axis direction of less than 1% in the range of from a glass transition temperature to a temperature of 40° C. higher than a glass transition temperature.

Abstract: Solution casting of polymer film (76, 102) is provided. A dope (22, 115-117) containing a polymer of cellulose triacetate and solvent is cast on a casting support band (34, 121) which moves, to form a cast film (69, 122), and then the cast film is stripped from the casting support band and dried, to produce the polymer film. In the solution casting, the cast film is cooled shortly before stripping the cast film from the casting support band. Preferably, a cooling temperature to which the cast film is cooled is set lower than 6 deg. C. The cast film is cooled within a predetermined cooling region, disposed to start at a stripping point for the cast film, and to extend upstream therefrom with a length equal to or less than 25% of the length of the casting support band. The cast film is blown by cooling gas caused to flow for cooling.

Abstract: A method of producing and optical film, comprises the steps of: mixing a resin and grains, heating a mixture of the resin and the grains and kneading the heated melted mixture, thereby preparing a mixture material of the resin and the grains; dissolving the mixture material in a solvent, thereby preparing a resin solution; and casting the resin solution so as to form an optical film.

Abstract: An activated carbon producing system includes a carbonizer for carbonizing cellulose triacetate as cellulose acylate to create carbonized material. A pulverizer pulverizes the carbonized material to obtain granules. An activation device activates the granules to create activated carbon. The activated carbon producing system includes a dispenser for supplying the cellulose triacetate at a plural number of times. A heating furnace is operated at each time after the dispenser operates, for thermally decomposing the cellulose triacetate from the dispenser, to obtain the carbonized material by carbonization. The pulverizer pulverizes the carbonized material in a size equal to or more than 2 mm and equal to or less than 20 mm. Temperature of the heating furnace is equal to or higher than 300 deg. C. and equal to or lower than 600 deg. C.

Abstract: A method for producing starch films comprises the following steps: preparing a mixture comprising starch and water, wherein more than 50 weight percent of the starch is present in the form of particles of granular starch; shaping the mixture to form a film in a shaping process; solidifying the mixture by increasing the temperature of the mixture during and/or after the shaping process by more than 5° C. Films produced by this method have starch particles bonded to one another. A device for performing this method comprises a shaping device for enabling shaping of the starch material to form a film, and has a heating device for performing a heat treatment for destructuring of the starch during and/or after the shaping.

Abstract: A cellulose ester film exhibiting: a free volume radius of 0.25 to 0.31 nm and a half-width of 0.04 to 0.1 nm, the free volume radius and the half-width being determined by positron annihilation lifetime spectroscopy; and Ro of 0 to nm and Rt of ?30 to +20 nm, Ro and Rt being defined by the following equations: Equation (a): Ro=(nx?ny)×d; Equation (b): Rt=((nx+ny)/2?nz)×d (Ro: in-plane retardation, Rt: retardation in the thickness direction of the film, nx: in-plane refractive index in slow axis direction, ny: in-plane refractive index in fast axis direction, nz: refractive index in the thickness direction of the film (refractive indexes being measured at wavelength of 590 nm), d: thickness of the film (nm)).

Abstract: An activated carbon producing system includes a heating furnace for thermally decomposing multi-layer film including a polyvinyl alcohol layer and cellulose triacetate (TAC) layers formed on surfaces of the polyvinyl alcohol layer, to produce carbonized material by carbonization. An activation device activates the carbonized material with heat, to produce activated carbon by forming fine pores therein. A burner assembly combusts acetic acid contained in pyrolysis gas created by thermal decomposition in the heating furnace, to produce gaseous carbon dioxide. A first heat exchanger exchanges heat between the pyrolysis gas from the burner assembly and heat exchange medium, to provide the heating furnace with the heat of the heat exchange medium. A washer absorbs gaseous carbon dioxide contained in the pyrolysis gas from the first heat exchanger by use of alkaline absorption solution. If the multi-layer film contains additive, the washer washes away the combusted additive.

Abstract: A cellulous acylate film in which X-ray diffractive intensity satisfies the following Formulae (I) to (V) and in which a half-value width of the peak at 2?2 is 2.8° or less as observed in the sectional view in a direction parallel to the transport direction of the film: 0.60?Ici/Ico??Formula (I) Iam=I1+{(I3?I1)/(2?3?2?1)}×(2?2?2?1)??Formula (II) Ic=I2?Iam??Formula (III) Ici=Ic11/Ic12??Formula (IV) Ico={(Ic21/Ic22)+(Ic31/Ic32)}/2.

Abstract: A cellulous acylate film in which X-ray diffractive intensity satisfies the following Formulae (I) to (V) and in which a half-value width of the peak at 2?2 is 2.8° or less as observed in the sectional view in a direction parallel to the transport direction of the film: 0.00?Ici/Ico<0.60;??Formula (I) Iam=I1+{(I3?I1)/(2?3?2?1)}×(2?2?2?1);??Formula (II) Ic=I2?Iam;??Formula (III) Ici=Ic11/Ic12; and??Formula (IV) Ico={(Ic21/Ic22)+(Ic31/Ic32)}/2.

Abstract: A method for producing a cellulose acetate film including casting a dope containing a cellulose acetate having a total substitution degree of from 2.0 to 2.7 and a solvent on a support, and peeling away the obtained dope film from the support.

Abstract: A method for producing a thermoplastic film, comprising cooling and solidifying a filmy thermoplastic melt resin, by holding it between a metallic presser and a metallic casting roll for cooling; wherein the temperature of the filmy thermoplastic resin just before being held between the metallic presser and the casting roll for cooling is from Tg+20° C. to Tg+90° C. and a difference between a surface temperature (Tt) of the metallic presser and a surface temperature (T1) of the casting roll for cooling satisfies the formula (1) and a contact length Q satisfies the following formula (2) 0.5° C.?T1?Tt?20° C.??(1) 0.1 cm?Q?8 cm??(2) The method provides a thermoplastic film having high thickness accuracy and surface smoothness.

Abstract: Disclosed is a cellulose acylate film comprising a cellulose acylate satisfying relations of 2.0?A+B?2.45, (II): and 0.8?A?1.4, and (III): 0.6?B?1.65 where “A” represents a degree of acetyl substitution of hydroxy in a glucose unit of cellulose acylate; and “B” represents a degree of with C3 or longer acyl substitution of hydroxy in a glucose unit of cellulose acylate; and satisfying relations of 50 nm?Re(590)?70 nm, 100 nm?Rth(590)?120 nm, and (VI): 1.4?Rth(590)/Re(590)?2.6.

Abstract: A casting dope (27) prepared from CAP, additive and solvent is cast onto a belt (46) and peeled as a wet film (74) that is drawn in the longitudinal direction in a transporting area (80). In a tenter device (47), while the wet film (74) is stretched in the widthwise direction, a relaxation of the wet film (74) in the longitudinal direction is made. If an extent percentage of the stretch is less than 70%, the relation is started. The wet film (74) is fed out as a polymer film (82) from the tenter device (47). On the polymer film (82), the in-plane retardation increases and the thickness retardation decreases. Thus the optical properties become preferable.

Abstract: An object of the invention was to provide a method for producing an optical compensation film having low haze and high uniformity of retardation, and a polarization plate and a liquid crystal displaying apparatus which is considerably reduced in the visivility variation caused by heat from a direct lighting type backlight of variation of the environment conditions and the color reproducibility is excellent. Disclosed is a method for producing an optical compensation film comprising the steps of cellulose resin film formed by melt-casting a composition which containing a cellulose resin, wherein the cellulose resin has a residual sulfuric acid content of 0.1-50 ppm, providing a polymer layer on the cellulose resin film, and stretching the cellulose resin film together with the polymer layer.

Abstract: A method of producing a long roll retardation film comprising the sequential steps of: (a) casting a film forming material on an endless support to form a long roll film; (b) stretching the long roll film in a lateral direction of the long roll film while both edges of the long roll film are held employing a plurality of clips for each of the edges in a tenter (First Process); (c) reducing distances in the lateral direction between the clips holding the both edges of the long roll film while the edges of the long roll film are held continuously from First Process with the clips (Second Process); (d) enlarging the distances in the lateral direction between the clips holding the both edges of the long roll film while the edges of the long roll film are held continuously from Second Process with the clips (Third Process).

Abstract: The invention relates to the film products and methods of their preparation that demonstrate a non-self-aggregating uniform heterogeneity. Desirably, the films disintegrate in water and may be formed by a controlled drying process, or other process that maintains the required uniformity of the film. The films contain a polymer component, which includes polyethylene oxide optionally blended with hydrophilic cellulosic polymers. Desirably, the films also contain a pharmaceutical and/or cosmetic active agent with no more than a 10% variance of the active agent pharmaceutical and/or cosmetic active agent per unit area of the film.

Abstract: Dope is discharged onto the peripheral surface of a rotating casting drum to form a casting bead. A decompression chamber decompresses an upstream side from the casting bead in a moving direction of the casting drum. The decompression chamber includes a sensor unit for detecting a width of the casting bead. A control section shifts outer side seal plates in the width direction based on the width data, such that the outer side seal plates are located in an upstream side from side ends of the casting bead. Upon formation of a casting bead having a new width, the control section shifts the outer side seal plates based on the new width such that the outer side seal plates are located in the upstream side from the side ends of the casting bead having the new width.

Abstract: A manufacturing method of an optical film provided with a convexoconcave structure, comprises the steps of: coating a resin solution including a first resin solved by a solvent onto an endless or roll-like mold provided with a convexoconcave structure, and forming a resin solution layer on the mold; laminating a film substrate onto the resin solution layer to make a laminated film before the solvent in the resin solution layer is completely dried, the film substrate including a second resin, which is capable of absorbing the solvent or is soluble by the solvent; and peeling the laminated film from the mold before the solvent in the laminated film is completely dried.

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: The invention relates to film products containing desired levels of active components and methods of their preparation. Desirably, the films disintegrate in water and may be formed by a controlled drying process, or other process that maintains the required uniformity of the film. Desirably, the films may be exposed to temperatures above that at which the active components typically degrade without concern for loss of the desired activity.

Abstract: An optical film producing method, comprises steps of: extruding a melted material including a melted cellulose ester resin from a casting die by using an extruding device; forming a film by pressing the extruded melted material between a first rotating member and a second rotating member; and winding up the formed film, wherein the following formulas are satisfied: 30° C.?T1?T2?60° C., 0° C.?T2?T3?20° C., Tg<T3, where T1 is the temperature of the melted material at an exit of the casting die, T2 is the temperature of the film at a point where the film firstly contacts the first rotating member, T3 is the temperature of the film at a point where the film is pressed between the first rotating member and the second rotating member, and Tg is the glass transition temperature of the film.

Abstract: Disclosed is a cellulose ester film which is suppressed in volatilization of components during film formation, while having high surface flatness, high durability after saponification and good adhesion to a polarizer. Also disclosed is a method for producing such a cellulose ester film by melt forming. Further disclosed are a polarizing plate having high light resistance and high durability, and a liquid crystal display having high image quality. Specifically disclosed is a cellulose ester film characterized by containing a cellulose ester, a compound represented by the general formula (1) below, and a compound represented by the general formula (2) below.

Abstract: Disclosed is a process for manufacturing a polarizing plate protecting film comprising the steps of providing a film formation composition containing cellulose resin having a total acyl substitution degree of from 2.5 to 2.9, a plasticizer and a hindered amine or hindered phenol compound, heat-melting the film formation composition to obtain a melt, extruding the melt to be in the form of sheet, and cooling the extruded sheet to form a film, wherein the cellulose resin contains an alkaline earth metal in an amount of from 1 to 50 ppm and a residual sulfuric acid (in terms of sulfur content) in an amount of from 0.1 to 45 ppm, based on the weight of cellulose resin.

Abstract: A rolled optical film includes a cellulose ester film which has a width of from 1 m to 3 m and a length of 500 m or more and is shaped in a rolled film. The cellulose ester film includes streaks from 1 line to 20 lines per 10 mm in a lateral direction thereof in which the streaks have a height of from 50 nm to 300 nm, an inclination of from 50 nm/mm to 300 nm/mm and a continuous length of 50 cm or more in a longitudinal direction thereof and the cellulose ester film does no includes a streak which has a height of 300 nm or more, an inclination of 300 nm/mm or more and a continuous length of 50 cm or more in a longitudinal direction thereof.

Abstract: An optical film manufacturing method, comprising steps of: forming a film by casting a liquid-state resin; embossing both ends of the formed film in a lateral direction of the film so as to form embossed sections for conveying the film; conveying the film having the embossed sections by a freely rotatable conveyance roller; trimming and removing the embossed sections of the film after the conveying step; and winding up the film.

Abstract: A casting dope (27) is cast onto a running casting belt (46) to form a casting film (69). Drying devices are disposed in both surface side of the casting belt (46), so as to dry the casting film (69). The casting film (69) is conveyed through drying zones in which drying temperatures are respectively determined according to the content of remaining solvent in the casting film (69) on the basis of the graph of film production limit line that is different between the main compound of the solvent. Then the drive conditions of each drying device were set, such that the drying of the casting film (69) might be made at the drying temperature. Thus the drying temperatures are previously determined adequately to the content of remaining solvent. Therefore, the drying of the casting film can be made without a large luck of supply with the thermal energy, and the like.

Abstract: A dope producing apparatus is provided with a first feed line for sending polymer solution from a fourth tank to a solution casting apparatus. The first feed line is provided with a first orifice for adding dilute liquid to the polymer solution; a first inline mixer for inline-mixing the polymer solution and the dilute liquid to produce a mixture; a second orifice for adding matting liquid to the mixture; and a second inline mixer for mixing the mixture and the matting liquid to produce a first dope.

Abstract: A casting film (24) is formed by casting a cellulose acylate solution (16) onto a cold drum (22) continuously running. The cellulose acylate solution (16) contains at most 0.01% of a compound which is extracted to a liquid incompatible with the water in a mixture of the water and the liquid. That is, at most 50 mg of the compound is contained in 100 g of cellulose acylate. In the cellulose acylate solution (16), a concentration C1 of Ca is at most 100 ppm, a proportion of the C1 to a concentration C2 of sulfuric acid satisfies the following formula: 0.5?C1/C2?1.5, and a concentration of Mg is in the range of 5 ppm to 50 ppm. Thereby, contamination of the surface of the cold drum (22) is prevented.

Abstract: A casting film is formed by casting a dope containing a polymer and a solvent onto a support. Thereafter, the casting film is peeled off from the support as a wet film (74). The wet film (74) is transported to a tenter device (47) having plural tenter clips (101). Before holding side edges of the wet film (74) by the tenter clips (101), air is blown from an outlet (120a) of an air nozzle (120) to a curled portion (74a) such that the air is pressed against the curled portion (74a). Thereby, the curled portion (74a) is flattened to become an approximately flat portion (74b).

Abstract: A cellulose ester film that excels in uniformity of retardation as an optical property, especially uniformity of retardation in the direction of film width, and further contrast; a process for producing such a cellulose ester film; and making use of the film, an optical film, polarizing plate and liquid crystal display unit. There is provided a process characterized by subjecting, to melting film formation, a solid cellulose ester having been suspension washed with a poor organic solvent to cellulose ester in the presence of an antioxidant so that the content of free acids in the cellulose ester is 50 ppm or less.

Abstract: In a stretching area of a tenter, a film is stretched in a Z2 direction. The film has a residual solvent level of not less than 0.03 wt. % and not greater than 10 wt. %. Out of the stretching area, the film enters a relaxing area to relax the film at a predetermined relaxation rate Y (%). Surface temperatures Tp, Ts, Th (° C.) and the relaxation rate Y are controlled to satisfy an expression of 6?{(? 1/12)×Tp}+{(??)×Ts}+{(?)×Th}+Y?18, where Tp is the temperature of the film five seconds before entering the stretching area, Ts is the temperature of the film at the center in a film transfer direction of the stretching area, and Th is the temperature of the film five seconds after departing the stretching area.

Abstract: Dope is cast onto a moving casting drum to form a casting film. After being cooled to be solidified, the casting film is peeled as a wet film from the casting drum. A residual amount of solvent in the casting film at the time of peeling it from the casting drum is denoted by W. In a first tenter, while being dried, the wet film is stretched in its width direction to form an intermediate film. Before the residual amount of solvent in the wet film reaches (W-100) wt %, the wet film is widened in its width direction such that the increased width is not less than 105% and not more than 130% of the width before the width increasing. The intermediate film is stretched and widened in its width direction in the second tenter such that the increased width is not less than 110% and not more than 160% of the width before the width increasing. Thus, it is possible to produce a film having optical properties in which Re is high and a value of Rth/Re is decreased in comparison with conventional films.

Abstract: Disclosed is a cellulose ester film comprising a polymer prepared by polymerizing at least one ethylenically unsaturated monomer selected from vinyl esters, vinyl esters having a functional group, acrylic esters, and acrylic esters having a functional group, wherein the polymer has a weight average molecular weight of not more than 5,000.

Abstract: In order to produce a cellulose ester film constructed of a front layer, an intermediate layer and a rear layer, a dope solution is doped on a supporter. In at least one of the front layer and the rear layer, a mass ratio of a cotton linter to a wood pulp (cotton linter/wood pulp) is between 5/95 and 0/100, and a solvent of the dope contains more than 15 wt.% alcohols and hydrocarbons whose carbon number each is 1-10. Further, a ratio of a solid content density of a solution for forming the front layer and the rear layer to a solid density of a solution for forming the intermediate layer is less than 0.9 wt.%, and a total thickness of the solutions for front and rear layers is more than 5% of the dope ribbon.