JP2011178492A - Web carrying device, polymer film forming method, and layered web manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an accompanied wind from flowing between a supporting film and winding rollers for carrying the film. <P>SOLUTION: The supporting film 33 has a polymerizable film 12 on a surface 33a. The supporting film 33 is wound around a winding roller 61 to be carried. A portion of the supporting film 33 wound around the winding roller 61 is subject to a polymerization step. By the polymerization step, the polymerizable film 12 becomes a polymer film 18. As the supporting film 33 moves, the accompanied wind 400a is generated near the supporting film 33. By the rotation of the winding roller 61, the accompanied wind 400b is generated near a periphery 61a. Each of the accompanied winds 400a, 400b flows between the supporting film 33 and the winding roller 61. A wind shield roller 68 is provided at a carrying direction upstream side of the winding roller 61. The wind shield roller 68 is arranged in contact with a rear face 33b, and near the periphery 61a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a web conveying device, a polymer film forming method, and a laminated web manufacturing method.

  Among the polymer films, cellulose acylate films have features such as excellent transparency and flexibility. Applications of such polymer films include window pasting films for pasting on window glass, touch panel films, ITO substrate films, membrane switch films, three-dimensional decorative films, and optical functionality for flat panel displays. Wide range of films.

  Among the applications as described above, a case where the surface of the polymer film is contacted or rubbed with a hand, a cloth, a touch pen or the like is assumed. In such a case, in order to prevent the surface of the polymer film from being damaged, a hard coat layer harder than the polymer film is provided on the surface of the polymer film.

  An example of a method for producing a polymer film having a hard coat layer on the surface will be described. First, a film containing a solvent and an ultraviolet curing agent (hereinafter referred to as an ultraviolet curable film) is formed on the surface of the polymer film (hereinafter referred to as a film forming process). Next, the solvent is evaporated from the ultraviolet curable film (referred to as a drying step). Third, the ultraviolet curing agent contained in the ultraviolet curable film is polymerized by irradiation with ultraviolet rays (referred to as a polymerization step). By this polymerization step, a film containing a polymer of an ultraviolet curing agent (hereinafter referred to as a polymer film) can be obtained from the ultraviolet curable film. Thus, a laminated film having a support layer made of a polymer film and a hard coat layer made of a polymer film can be produced.

  Furthermore, mass production of laminated films can be achieved by sequentially introducing a belt-shaped polymer film into a film forming apparatus that performs a film forming process, a drying apparatus that performs a drying process, and a polymerization apparatus that performs a polymerization process. It becomes possible.

  As a means for transporting a polymer film in this polymerization step, a method using a plurality of support rollers has been common. However, when a conveyance tension is applied to the polymer film, a crease is generated in a portion of the polymer film that does not come into contact with the support roller. If the polymerization process is performed in a state where the wrinkles are generated in the polymer film, traces of the wrinkles will eventually remain in a streak shape (hereinafter referred to as a streak failure).

  In order to prevent this streak failure, a mode (for example, Patent Document 1) in which the polymer film is transported by being wound around a support roller is adopted as the transport mode of the polymer film in the polymerization process. According to the method of patent document 1, since a superposition | polymerization process can be performed about the part supported by the surrounding surface of the support roller among polymer films, a stripe failure can be eliminated.

JP 2006-247530 A

  However, in the vicinity of the polymer film, an accompanying wind that flows following the polymer film or the supporting roller that is conveyed is generated. If this accompanying air enters between the support roller and the polymer film, air remains between the support roller and the polymer film. If the polymerization process is performed on the polymer film in such a state, traces of air remain in a streak pattern on the hard coat layer (hereinafter referred to as air trace failure). For this reason, an air trace failure induces a decrease in flatness.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a web conveying device, a polymer film forming method, and a laminated web manufacturing method.

  The present invention is a web provided with a polymerizable film containing a polymerizable material on a surface thereof, and a support means for supporting the back surface of the web is provided in a conveyance path of the web. In a web conveying apparatus that supports a back surface and includes a movable support surface, the polymerizable material is polymerized with respect to a portion of the web supported by the support surface to obtain a polymer film from the polymerizable film. It is characterized by having a superimposing means and a wind shielding means arranged on the upstream side in the transport direction from the support means and blocking the accompanying wind flowing between the web and the support surface.

  The wind-shielding means includes a wind-shielding roller, and the circumferential surface of the wind-shielding roller has the back surface on the upstream side in the transport direction with respect to the support means, and the upstream side in the movement direction with respect to the position supporting the back surface. It is preferable to contact at least one of the support surfaces. Moreover, it is preferable that the said wind-shielding means adjoins at least one among the said back surface of the conveyance direction upstream rather than the said support means, and the said support surface of the said movement direction upstream rather than the position which supports the said back surface. . Furthermore, it is preferable that the wind shielding means adjacent to the back surface on the upstream side in the transport direction with respect to the support means is a downstream roller for transporting the web located on the downstream side in the transport direction with respect to the support means.

  The wind-shielding member joins a web-entrained air generated along with the movement of the web on the upstream side of the support means and a support-surface-accompanying air generated along with the movement of the support surface. It is preferable to have a part.

  The method for forming a polymer film of the present invention comprises a web having a polymerizable film containing a polymerizable material on the surface, and the back surface of the web is supported using a movable support surface provided on a support means. However, the conveyance process which conveys the said web is performed, and the said conveyance process superposes | polymerizes the said polysynthetic material about the part supported by the said support means among the said webs, and obtains a polymer film from the said polymeric film | membrane. It has a superposition | polymerization process and a wind-shielding process which is performed before this superposition | polymerization process and interrupts the accompanying wind which flows toward between the said web and the said support surface, It is characterized by the above-mentioned.

  The accompanying air is preferably a web accompanying air that is generated along with the conveyance of the web on the upstream side in the conveying direction with respect to the support means and flows in the vicinity of the web. Moreover, in the said wind-shielding process, it is preferable to interrupt | block the said web accompanying wind using the said web which passed through the said superposition | polymerization process. Further, the conveyance of the web on the downstream side in the conveyance direction with respect to the support means is performed so as to pass by the web conveyed on the upstream side in the conveyance direction with respect to the support means. Also, an upstream web-accompanying wind generated with the movement of the web on the upstream side in the transport direction and a downstream web-accompanying wind generated with the movement of the web on the downstream side in the transport direction with respect to the support means. It is preferable to merge.

  The accompanying air is preferably a supporting surface accompanying air that is generated along with the movement of the supporting surface and flows in the vicinity of the supporting surface. Further, in the wind-shielding step, an upstream-side web-accompanying air generated with the movement of the web on the upstream side in the transport direction from the support means, and a support-surface-accompanying air generated with the movement of the support surface; It is preferable to have a merging part for merging.

  The present invention provides a method for producing a laminated web having the web and the polymer film, wherein the polymerizable film is formed by applying a coating solution containing the polymerizable material and a solvent on one surface of the web. And a drying step for evaporating the solvent from the polymerizable film, and the method for forming the polymer film is performed.

  According to the present invention, the entrained wind generated by the web conveyance is blocked on the upstream side in the conveyance direction with respect to the portion where the polymerization process is performed, so that an air trace failure can be prevented. Therefore, according to the present invention, it is possible to avoid a decrease in flatness of the laminated film due to an air trace failure.

It is a flowchart which shows the outline | summary of the polymer film formation method. It is explanatory drawing which shows the outline | summary of the laminated film manufacturing equipment which has a 1st polymer film formation unit. It is explanatory drawing which shows the outline | summary of a 2nd polymer film formation unit. It is explanatory drawing which shows the outline | summary of a 3rd polymer film formation unit. It is explanatory drawing which shows the outline | summary of a 4th polymer film formation unit. It is explanatory drawing which shows the outline | summary of the 5th polymer film formation unit. It is explanatory drawing which shows the outline | summary of the 6th polymer film formation unit. It is a side view which shows the outline | summary of a laminated film.

  As shown in FIG. 1, the polymer film forming method 10 includes a film forming step 13 in which a coating liquid 11 containing a polymerizable material and a solvent is applied to a web to form a polymerizable film 12 on the web. A drying process 15 for evaporating the solvent from the film 12, a wind shielding process 17 for blocking the entrained wind described later, and a polymerization process 19 for obtaining a polymer film 18 containing a polymer of a polymerizable material from the polymerizable film 12.

  And it can use as a polymer film by peeling the polymer film 18 from a web. Further, the polymer film 18 can be used as a laminated film having the web (first layer) and the polymer film 18 (second layer) without peeling off from the web.

  Next, the manufacturing method of the laminated | multilayer film of this invention is demonstrated.

  As shown in FIG. 2, the laminated film manufacturing facility 30 for producing the laminated film 25 includes a storage portion 32 for storing a roll-shaped support film (hereinafter referred to as a support film roll) 31, and a support film from the support film roll 31. And a drawer 34 for pulling out 33. The drawing unit 34 includes a winding core 37 and a driving unit 38 that drives the winding core 37.

  A plurality of transport rollers 39 are arranged from the storage unit 32 toward the drawing unit 34. These transport rollers 39 provide a transport path 41 for the support film 33. The transport path 41 is provided with a polymer film forming unit 44 that performs the polymer film forming method 10 (see FIG. 1) and forms the polymer film 18 on the support film 33. The lead-out portion 34 pulls out the support film 33 with a predetermined tension, and winds the support film 33 having the polymer film 18 around the winding core 37 as the laminated film 25. Note that all of the plurality of transport rollers 39 may be free rollers, or the plurality of transport rollers 39 may include drive rollers.

(Support film)
The material for forming the support film 33 is not particularly limited as long as it is light transmissive, but is preferably a polymer, such as cellulose acylate, cyclic polyolefin, lactone ring-containing polymer, cyclic polyolefin, polycarbonate and the like. can give. The details of cellulose acylate will be described later.

  The polymer film forming unit 44 includes a film forming device 47 that performs the film forming step 13 (see FIG. 1), a drying device 48 that performs the drying step 15 (see FIG. 1), a wind shielding step 17 (see FIG. 1), and A polymerization casing 49 for performing the polymerization step 19 (see FIG. 1).

  The film forming apparatus 47 has a die 51 that applies the coating liquid 11 containing an ultraviolet curing agent and a solvent to the surface 33 a of the support film 33. By application of the coating liquid 11, the polymerizable film 12 made of the coating liquid 11 is formed on the surface 33 a of the support film 33. The coating solution is prepared by dissolving or colloidally dispersing an ultraviolet curing agent in a suitable solvent. At this time, the concentration of the ultraviolet curing agent is appropriately selected according to the use, but it is generally preferably 10% by mass or more and 95% by mass or less.

(UV curing agent)
As the ultraviolet curing agent, for example, an ionizing radiation curable polyfunctional monomer or polyfunctional oligomer is preferably used. The functional group of the ionizing radiation-curable polyfunctional monomer or polyfunctional oligomer is preferably a light, electron beam, or radiation polymerizable group, and among them, a photopolymerizable functional group is preferable. Examples of the photopolymerizable functional group include unsaturated polymerizable functional groups such as a (meth) acryloyl group, a vinyl group, a styryl group, and an allyl group. Among them, a (meth) acryloyl group is preferable.

(solvent)
The solvent is preferably a compound that does not dissolve the substance forming the support film 33. Further, in order to improve the adhesion between the support film 33 and the polymer film 18 in the laminated film 25, a compound that swells the substance forming the support film 33 is preferable. Furthermore, the solvent is not particularly limited as long as the ultraviolet curing agent is uniformly dissolved or dispersed without causing precipitation, and two or more kinds of solvents can be used in combination.

  Preferable examples of the solvent include alcohols, ketones, esters, amides, ethers, ether esters, hydrocarbons, halogenated hydrocarbons and the like as dispersion media. Specifically, alcohol (for example, methanol, ethanol, propanol, butanol, benzyl alcohol, ethylene glycol, propylene glycol, ethylene glycol monoacetate, etc.), ketone (for example, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, methylcyclohexanone, etc.), ester ( For example, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, ethyl formate, propyl formate, butyl formate, ethyl lactate, etc.), aliphatic hydrocarbons (eg, hexane, cyclohexane, halogenated hydrocarbons (eg, methylene chloride, methyl chloroform, etc.)) , Aromatic hydrocarbons (eg, toluene, xylene, etc.), amides (eg, dimethylformamide, dimethylacetamide, n-methylpyrrolidone, etc.), ethers (eg Dioxane, tetrahydrofuran, ethylene glycol dimethyl ether, propylene glycol dimethyl ether, etc.), ether alcohol (eg, 1-methoxy-2-propanol, ethyl cellosolve, methyl carbinol, etc.), fluoroalcohol (eg, JP-A-8-143709) Compounds described in paragraph No. [0020] of the publication and paragraph No. [0037] of the publication No. 11-60807.

  These solvents can be used alone or in admixture of two or more. Preferred solvents include toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, methanol, isopropanol, and butanol. Further, a coating solvent system mainly comprising a ketone solvent (for example, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.) is also preferably used, and the content of the ketone solvent is 10% by mass or more of the total solvent contained in the curable composition. It is preferable. More preferably, it is 30 mass% or more.

  The drying device 48 includes a drying air supply unit 55 that applies a drying air 54 to the polymerizable film 12. By applying the drying air 54 to the polymerizable film 12, the solvent can be evaporated from the polymerizable film 12.

  In addition to the transport roller 39, a winding roller 61 that winds and transports the support film 33 and a housing 62 that covers a portion of the transport path 41 formed by the winding roller 61 are provided in the transport path 41 in the polymerization casing 49. A gas supply unit 63 for supplying an inert gas (such as nitrogen or a rare gas) is provided inside the housing 62.

  As a material for forming the winding roller 61, stainless steel, ceramics, or the like can be used. The radius of the winding roller 61 is preferably 300 mm to 1000 mm.

  The housing 62 is provided so as to be close to the support film 33 and the polymerizable film 12 that are transported through the transport path 41. The gas supply unit 63 supplies an inert gas into the housing 62 in order to fill the housing 62 with the inert gas.

  The housing 62 is provided with a polymerization device 65 having an ultraviolet lamp. The polymerization device 65 irradiates the polymerizable film 12 on the support film 33 wound around the winding roller 61 with ultraviolet rays. By irradiation with ultraviolet rays, the polymerizable film 12 becomes a polymer film 18 containing a polymer of an ultraviolet curing agent.

  A wind shield roller 68 that supports the back surface 33 b of the support film 33 is provided upstream of the winding roller 61 in the transport direction. Moreover, it is preferable that the wind shielding roller 68 and the winding roller 61 are provided close to each other.

  The distance CL1 between the position at which the support film 33 is separated from the wind shielding roller 68 and the position at which the contact between the support film 33 and the winding roller 61 starts is within a range where the wind shielding roller 68 and the winding roller 61 are not in contact with each other. The smaller one is preferable. Further, it is preferable that the distance CL2 between the wind shielding roller 68 and the winding roller 61 is as small as possible. For example, the interval CL1 is preferably 50 mm or more and 300 mm or less. The interval CL2 is preferably 0.1 mm or more and 10 mm or less.

  Stainless steel, ceramics, or the like can be used as a material for forming the wind shield roller 68. The radius of the wind shielding roller 68 is not particularly limited as long as the wind shielding effect is obtained, but is preferably 200 mm or less, and more preferably 150 mm or less, for example.

  A roller temperature controller 71 is connected to the wind shield roller 68 and the winding roller 61. The roller temperature controller 71 includes a temperature adjusting unit that adjusts the temperature of the heat transfer medium. The roller temperature controller 71 circulates the heat transfer medium adjusted to a desired temperature between the temperature adjusting unit and the flow path provided in the wind-shielding roller 68. Similarly, the roller temperature controller 71 circulates the heat transfer medium adjusted to a desired temperature between the temperature adjusting unit and the flow path provided in the winding roller 61. Due to the circulation of the heat transfer medium, the temperatures of the wind shield roller 68 and the winding roller 61 can be kept at desired temperatures, respectively.

  The operation of the present invention will be described. As shown in FIG. 2, the drawing portion 34 pulls the support film 33 from the storage portion 32 with a predetermined tension. The support film 33 passes through the polymer film forming unit 41 at a predetermined moving speed. The support film 33 sent out from the polymer film forming unit 41 becomes the laminated film 25. The laminated film 25 is wound around the winding core 37 by the drawing portion 34.

  Next, the film forming apparatus 47 applies the coating liquid 11 to the surface 33 a of the support film 33. By application of the coating solution 11, the polymerizable film 12 is formed on the surface 33a.

  The drying device 48 applies a drying air 54 to the polymerizable film 12 on the support film 33 to evaporate the solvent from the polymerizable film 12. The temperature of the drying air 54 is preferably 10 ° C. or higher and 150 ° C. or lower, and more preferably 20 ° C. or higher and 120 ° C. or lower. The evaporation of the solvent from the polymerizable film 12 is preferably performed until the residual solvent amount in the polymerizable film 12 is 0.5% by mass or less.

  The lower limit of the thickness of the polymerizable film 12 that has undergone the drying step is preferably 3 μm or more, and more preferably 5 μm or more. The upper limit of the thickness of the polymerizable film 12 is preferably 30 μm or less, and more preferably 15 μm or less.

  The support film 33 that has passed through the drying device 48 is introduced into the polymerization casing 49. The support film 33 introduced into the polymerization casing 49 is conveyed by the conveyance roller 39 or the like. Further, the winding roller 61 around which the support film 33 is wound rotates as the support film 33 is conveyed. The superposition | polymerization process 19 (refer FIG. 1) is performed to the part wound around the winding roller 61 among the support films 33 of a conveyance state. By this polymerization step 19 (see FIG. 1), the support film 33 having the polymerizable film 12 becomes the laminated film 25.

  When the support film 33 is conveyed at a predetermined moving speed, a film-entrained wind 400 a is generated in the vicinity of the support film 33. Further, due to the rotation of the winding roller 61, a peripheral surface accompanying air 400 b is generated in the vicinity of the peripheral surface 61 a of the winding roller 61. The film accompanying air 400 a and the peripheral surface accompanying air 400 b flow between the support film 33 and the winding roller 61.

  In the present invention, since the wind-shielding roller 68 is provided at a predetermined position, the accompanying winds 400 a and 400 b can be prevented from entering between the support film 33 and the winding roller 61. Therefore, according to the present invention, it is possible to mass-produce laminated films while preventing air trace failures.

  Hereinafter, other embodiments of the present invention will be described. In the following description, the same parts and the like as those of the above-described embodiment are denoted by the same reference numerals, detailed description thereof is omitted, and only different parts are described.

  In the above embodiment, the wind shielding roller 68 is provided at a position close to the peripheral surface 61a of the winding roller 61 while being in contact with the back surface 33b of the support film 33. However, the present invention is not limited to this. For example, as shown in FIG. 3, a wind shielding roller 78 may be provided at a position in contact with the circumferential surface 61 a of the winding roller 61. Further, the wind shielding roller 78 may be provided so as to be close to the back surface 33 b of the support film 33. Although FIG. 3 shows a form using the wind shield roller 68 and the wind shield roller 78, the wind shield roller 68 may be omitted. When the wind shield roller 68 is omitted, the wind shield roller 78 may be provided so as to be in contact with the back surface 33 b of the support film 33. The material for forming the wind shielding roller 78 is not particularly limited as long as it does not damage the peripheral surface 61a of the winding roller 61. For example, a synthetic resin such as Teflon (registered trademark) or polyethylene can be used.

  In the said embodiment, although the roller was used as a wind-shielding member which shields each accompanying wind 400a, 400b, this invention is not restricted to this, You may use a plate-shaped or block-shaped wind-shielding member. FIG. 4 shows an example in which a wind shielding plate 88 arranged in a posture standing on the back surface 33b and a wind shielding plate 89 arranged in a posture standing on the peripheral surface 61a are provided. The wind shielding plate 88 is preferably provided in the vicinity of the back surface 33b. The wind shielding plate 89 is preferably provided in the vicinity of the peripheral surface 61a. Any one of the wind shielding plates 88 and 89 may be omitted. FIG. 5 shows an example in which a wind shielding block 90 is provided between the back surface 33b and the peripheral surface 61a. In addition, you may use together each wind-shielding roller which contacts the back surface 33b and the surrounding surface 61a with the wind-shielding block and windscreen which adjoin to the back surface 33b and the surrounding surface 61a. The wind shield block 90 is preferably provided so as to be close to the back surface 33b and the peripheral surface 61a. The material for forming each of the wind shield members 88 to 90 is the same as that of the wind shield roller 68 and the wind shield roller 78.

  Moreover, you may provide the guide surface 90a which changes the wind direction of each accompanying wind 400a, 400b in the wind-shielding member 90. FIG. For example, as illustrated in FIG. 6, the guide surface 90 a is preferably formed so that the accompanying winds 400 a and 400 b merge.

  In the above embodiment, the wind shield member is a wind shield roller, plate, or block. However, the present invention is not limited to this, and the laminated film 25 may be used as the wind shield member. As shown in FIG. 7, the laminated film 25 may be transported using wind shield rollers 95 a and 95 b disposed so as to be close to the back surface 33 b on the upstream side in the transport direction from the winding roller 61. Thereby, the laminated film 25 conveyed by the wind shield rollers 95a and 95b functions as a wind shield member for the accompanying winds 400a and 400b. Further, even when another accompanying wind is generated by the conveyance of the laminated film 25 by the wind shielding rollers 95a and 95b, the laminated film 25 conveyed by the wind shielding rollers 95a and 95b is more than the winding roller 61. Since it passes by the laminated film 25 on the upstream side in the conveying direction, the accompanying wind generated by the conveyance of both laminated films merges, and as a result, the inflow of the accompanying air between the winding roller 61 and the laminated film 25 is prevented. be able to. In FIG. 7, both of the wind shielding rollers 95a and 95b are used. However, the present invention is not limited to this, and one of the wind shielding rollers 95a and 95b may be omitted.

  In the above embodiment, the winding roller 61 is used. However, the present invention is not limited to this, and a support belt may be used instead of the winding roller 61. The support belt is arranged so as to be wound around a plurality of rollers. Both ends in the longitudinal direction of the support belt are connected. For this reason, the support belt is annular. By driving any one of the plurality of rollers, the support belt moves annularly in a predetermined direction. You may convey the support film 33 which has the polymeric film | membrane 12 using the surface of such a support belt.

  The conveyance speed of the laminated film 25 is preferably 20 m / min or more, and more preferably 30 m / min or more. The upper limit of the conveyance speed of the laminated film 25 is not particularly limited as long as there is no problem caused by an increase in the conveyance speed, but it is preferably, for example, 70 m / min or less.

(Laminated film)
As shown in FIG. 8, the laminated film 25 includes a support layer 25a made of the support film 33 and a hard coat layer 25b made of the polymer film 18 and harder than the support layer 25a. The thickness d of the laminated film 25 is not particularly limited, but is preferably 5 μm or more and 120 μm or less, and more preferably 40 μm or more and 80 μm or less. The ratio dh / ds between the thickness ds of the support layer 25a and the thickness dh of the hard coat layer 25b is preferably 0.04 or more and 0.50 or less, for example, 0.10 or more and 0.40 or less. It is more preferable that

  The refractive index of the hard coat layer 25b in the present invention is preferably in the range of 1.45 to 2.00, and in the range of 1.45 to 1.55 in order to impart antireflection properties to the laminated film 25. More preferably, it is more preferably 1.48 to 1.55, and particularly preferably 1.49 to 1.53. By controlling the refractive index of the hard coat layer 25b within this range, it is possible to obtain a laminated film in which the reflectance of the surface is sufficiently reduced while keeping the reflection color in a neutral range. Furthermore, by controlling the refractive index of the hard coat layer 25b within this range, failure caused by the difference in refractive index between the support layer 25a and the hard coat layer 25b, which is called interference unevenness, can be reduced.

  The strength of the hard coat layer 25b is preferably 2H or more, more preferably 3H or more, and most preferably 4H or more in the pencil hardness test. Furthermore, in the Taber test according to JIS K5400, the smaller the wear amount of the test piece before and after the test, the better.

(Cellulose acylate)
As the cellulose acylate, triacetyl cellulose (TAC) is particularly preferable. Of the cellulose acylates, those in which the hydroxyl group of cellulose is esterified with a carboxylic acid, that is, the substitution degree of the acyl group satisfies all of the following formulas (I) to (III) are more preferable. In the following formulas (I) to (III), A and B represent the substitution degree of the acyl group, A is the substitution degree of the acetyl group, and B is the substitution degree of the acyl group having 3 to 22 carbon atoms. It is. In addition, it is preferable that 90 weight% or more of TAC is a particle | grain of 0.1 mm-4 mm.
(I) 2.5 ≦ A + B ≦ 3.0
(II) 0 ≦ A ≦ 3.0
(III) 0 ≦ B ≦ 2.9

  Glucose units having β-1,4 bonds constituting cellulose have free hydroxyl groups at the 2nd, 3rd and 6th positions. Cellulose acylate is a polymer obtained by esterifying some or all of these hydroxyl groups with an acyl group having 2 or more carbon atoms. The degree of acyl substitution means the ratio of the hydroxyl group of cellulose esterified at each of the 2-position, 3-position and 6-position (100% esterification has a substitution degree of 1).

  The total acylation substitution degree, that is, DS2 + DS3 + DS6 is preferably 2.00 to 3.00, more preferably 2.22 to 2.90, and particularly preferably 2.40 to 2.88. Further, DS6 / (DS2 + DS3 + DS6) is preferably 0.28 or more, more preferably 0.30 or more, and particularly preferably 0.31 to 0.34. Here, DS2 is the degree of substitution of the hydroxyl group at the 2-position of the glucose unit with an acyl group (hereinafter also referred to as “degree of acyl substitution at the 2-position”), and DS3 is the degree of substitution of the hydroxyl group at the 3-position with an acyl group (hereinafter, referred to as “acyl group”). DS6 is the substitution degree of the hydroxyl group at the 6-position with an acyl group (hereinafter also referred to as “acyl substitution degree at the 6-position”).

  Only one type of acyl group may be used in the cellulose acylate of the present invention, or two or more types of acyl groups may be used. When two or more kinds of acyl groups are used, it is preferable that one of them is an acetyl group. When the sum of the substitution degrees by the hydroxyl groups at the 2nd, 3rd and 6th positions is DSA, and the sum of the substitution degree by an acyl group other than the acetyl group at the 2nd, 3rd and 6th hydroxyl groups is DSB, the value of DSA + DSB is More preferably, it is 2.22 to 2.90, and particularly preferably 2.40 to 2.88. The DSB is 0.30 or more, particularly preferably 0.7 or more. Further, 20% or more of DSB is a substituent at the 6-position hydroxyl group, more preferably 25% or more is a substituent at the 6-position hydroxyl group, more preferably 30% or more, and particularly 33% or more is a 6-position hydroxyl group. It is preferable that it is a substituent. Furthermore, the cellulose acylate having a substitution degree of 6-position of cellulose acylate of 0.75 or more, further 0.80 or more, and particularly 0.85 or more can be mentioned. With these cellulose acylates, a solution having a preferable solubility (dope) can be produced. In particular, a good solution can be prepared in a non-chlorine organic solvent. Furthermore, it is possible to produce a solution having a low viscosity and good filterability.

  Cellulose, which is a raw material for cellulose acylate, may be obtained from either linter or pulp.

  The acyl group having 2 or more carbon atoms of the cellulose acylate of the present invention may be an aliphatic group or an aryl group and is not particularly limited. These are, for example, cellulose alkylcarbonyl esters, alkenylcarbonyl esters, aromatic carbonyl esters, aromatic alkylcarbonyl esters, and the like, each of which may further have a substituted group. Preferred examples of these include propionyl, butanoyl, pentanoyl, hexanoyl, octanoyl, decanoyl, dodecanoyl, tridecanoyl, tetradecanoyl, hexadecanoyl, octadecanoyl, iso-butanoyl, t-butanoyl, cyclohexanecarbonyl, oleoyl, benzoyl , Naphthylcarbonyl, cinnamoyl group and the like. Among these, propionyl, butanoyl, dodecanoyl, octadecanoyl, t-butanoyl, oleoyl, benzoyl, naphthylcarbonyl, cinnamoyl and the like are more preferable, and propionyl and butanoyl are particularly preferable.

  In the said embodiment, although the polymer film 18 used as the hard-coat layer 25b was provided in the support film 33 used as the support layer 25a, this invention is not limited to this, The other functional layer is provided in the support film 33. Also good.

  In the above embodiment, the polymer support film 33 is used as the web. However, the present invention is not limited to this, and the present invention can also be applied to a metal web. In the case where the polymer film 18 is peeled off and used alone, it is preferable to use a film having good peelability from the polymer film 18.

  In the polymerization step 19, the polymerizable film 12 was irradiated with ultraviolet rays to polymerize the ultraviolet curing agent. However, the present invention is not limited to this, and a known polymerizable material is used according to the polymerizable material. Polymerization may be performed.

DESCRIPTION OF SYMBOLS 10 Polymer film formation method 12 Polymerizable film 17 Wind-shielding process 18 Polymer film 19 Polymerization process 25 Laminated film 33 Support film 61 Rolling rollers 68, 78, 78a-78b Wind-shielding roller

Claims (12)

A web having a polymerizable film containing a polymerizable material provided on a surface thereof, and a support means for supporting the back surface of the web is provided in a conveyance path of the web, and the support means supports the back surface of the web. In a web conveying device having a movable support surface,
Polymerizing means for polymerizing the polymerizable material and obtaining a polymer film from the polymerizable film for a portion of the web supported by the support surface;
An apparatus for conveying a web, comprising: wind shielding means disposed on an upstream side of the supporting means in a conveying direction and blocking entrained air flowing between the web and the support surface. The wind shield means includes a wind shield roller,
The circumferential surface of the wind-shielding roller is in contact with at least one of the back surface upstream of the support means in the transport direction and the support surface upstream of the movement direction from the position supporting the back surface. The web conveying apparatus according to claim 1, wherein the apparatus is a web conveying apparatus.   The wind-shielding means is close to at least one of the back surface on the upstream side in the transport direction with respect to the support means and the support surface on the upstream side in the movement direction with respect to a position for supporting the back surface. The web conveyance device according to claim 1 or 2.   4. The wind shielding means adjacent to the back surface upstream of the support means in the transport direction is a downstream roller for transporting the web located downstream of the support means in the transport direction. The web conveying apparatus as described.   The wind-shielding member joins a web-entrained air generated along with the movement of the web on the upstream side of the support means and a support-surface-accompanying air generated along with the movement of the support surface. 5. The web conveyance device according to claim 1, further comprising a section. A web having a polymerizable film containing a polymerizable material on the surface, and using a movable support surface provided on a support means, carrying the transport step of transporting the web while supporting the back surface of the web ,
The conveying step is
A polymerization step of polymerizing the heavy synthetic material and obtaining a polymer film from the polymerizable film for a portion of the web supported by the support means;
A method for forming a polymer film, comprising: a wind-blocking step that is performed before the polymerization step and blocks an accompanying wind flowing between the web and the support surface.   The polymer film according to claim 6, wherein the entrained air is a web-entrained air that is generated along with the conveyance of the web on the upstream side in the conveyance direction with respect to the support means and flows in the vicinity of the web. Forming method.   8. The method for forming a polymer film according to claim 7, wherein, in the wind shielding step, the web accompanying wind is blocked using the web that has undergone the polymerization step. Transport of the web on the downstream side in the transport direction from the support means is performed so as to pass the web transported on the upstream side in the transport direction from the support means,
In the wind-shielding step, an upstream web-entrained wind generated as a result of the movement of the web on the upstream side in the transport direction with respect to the support means, and a movement of the web on the downstream side in the transport direction with respect to the support means. The method for forming a polymer film according to claim 7, wherein the downstream web-entrained air generated in the step is merged.   The polymer film according to any one of claims 6 to 9, wherein the accompanying air is a supporting surface accompanying air that is generated along with the movement of the supporting surface and flows in the vicinity of the supporting surface. Forming method.   In the wind shielding step, the upstream web-accompanying air generated along with the movement of the web on the upstream side in the conveying direction with respect to the support means and the support surface-accompanying air generated along with the movement of the support surface are merged. The method for forming a polymer film according to claim 10, further comprising a joining portion to be formed. In the method for producing a laminated web having the web and the polymer film,
A film forming step of applying a coating liquid containing the polymerizable material and a solvent on one surface of the web to form the polymerizable film; and
A drying step of evaporating the solvent from the polymerizable film,
A method for producing a laminated web, wherein the method for forming a polymer film according to any one of claims 6 to 11 is performed.

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