WO2016021432A1 - Production method for polarizing film - Google Patents
Production method for polarizing film Download PDFInfo
- Publication number
- WO2016021432A1 WO2016021432A1 PCT/JP2015/071223 JP2015071223W WO2016021432A1 WO 2016021432 A1 WO2016021432 A1 WO 2016021432A1 JP 2015071223 W JP2015071223 W JP 2015071223W WO 2016021432 A1 WO2016021432 A1 WO 2016021432A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- film
- polyvinyl alcohol
- bath
- roll
- treatment
- Prior art date
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
Definitions
- the present invention relates to a method for producing a polarizing film that can be used as a constituent member of a polarizing plate.
- a polarizing film obtained by adsorbing and orienting a dichroic dye such as iodine or a dichroic dye on a uniaxially stretched polyvinyl alcohol resin film.
- a polarizing film is usually a polarizing plate obtained by laminating a protective film on one or both sides using an adhesive, and is used for image display devices such as liquid crystal televisions, monitors for personal computers, and liquid crystal display devices such as mobile phones. It is used.
- Patent Document 1 discloses a method in which a polyvinyl alcohol resin film is immersed in water at 30 ° C. for 5 minutes in order to suppress the curling of the film edge that occurs during the stretching of the polyvinyl alcohol resin film and to enable uniform stretching. It is disclosed that the curl angle is 180 ° or less.
- the polarizing film is continuously unwound from the roll (rolled product) of the polyvinyl alcohol-based resin film while being transported along the film transport path passing through the various treatment baths as described above, and is also used as a swelling bath.
- a continuous production can be carried out by applying a stretching treatment at any one or more stages from the immersion to the withdrawal from the crosslinking bath.
- the film may break during continuous production, particularly during the stretching process, and improvements have been demanded from the viewpoint of productivity and the yield of the polarizing film.
- the problem of film breakage during the stretching process is particularly remarkable when the thickness of the polyvinyl alcohol-based resin film is small.
- an object of the present invention is to provide a method for producing a polarizing film that can effectively suppress film breakage during stretching even when a thin polyvinyl alcohol-based resin film is used.
- This invention provides the manufacturing method of the polarizing film shown below.
- the manufacturing method of a polarizing film whose curl angle in at least one of the film width direction both ends when the said polyvinyl alcohol-type resin film immerses in a swelling bath is less than 90 degrees.
- the polyvinyl alcohol-based resin film is subjected to a drying treatment between the time when the polyvinyl alcohol-based resin film is unwound from a raw roll and immersed in a swelling bath.
- [1] or [2] The manufacturing method as described.
- the polyvinyl alcohol-based resin film is subjected to a widening process between the time when the polyvinyl alcohol-based resin film is unwound from the raw fabric roll and immersed in a swelling bath.
- the manufacturing method in any one.
- the polyvinyl alcohol-based resin film unwound from the raw fabric roll is immersed in a swelling bath by being conveyed along two or more rolls selected from a guide roll and a nip roll, Regarding the two or more rolls, L is 2 m or less, or T is 30 seconds, where L is the maximum distance between adjacent rolls and T is the maximum time required for conveyance between adjacent rolls.
- the method of the present invention it is possible to effectively suppress film breakage at the time of stretching treatment, which has conventionally occurred in a method for producing a polarizing film from a thin polyvinyl alcohol-based resin film.
- the polarizing film is one in which a dichroic dye (iodine or dichroic dye) is adsorbed and oriented on a uniaxially stretched polyvinyl alcohol resin film.
- the polyvinyl alcohol-based resin constituting the polyvinyl alcohol-based resin film is usually obtained by saponifying a polyvinyl acetate-based resin.
- the degree of saponification is usually about 85 mol% or more, preferably about 90 mol% or more, more preferably about 99 mol% or more.
- the polyvinyl acetate resin can be, for example, a copolymer of vinyl acetate, which is a homopolymer of vinyl acetate, or a copolymer of vinyl acetate and another monomer copolymerizable therewith.
- examples of other copolymerizable monomers include unsaturated carboxylic acids, olefins, vinyl ethers, and unsaturated sulfonic acids.
- the degree of polymerization of the polyvinyl alcohol resin is usually about 1000 to 10,000, preferably about 1500 to 5,000.
- polyvinyl alcohol resins may be modified.
- polyvinyl formal modified with aldehydes polyvinyl acetal, polyvinyl butyral, and the like may be used.
- an unstretched polyvinyl alcohol-based resin film (raw fabric) having a thickness of 65 ⁇ m or less (for example, 60 ⁇ m or less), preferably 50 ⁇ m or less, more preferably 35 ⁇ m or less, and even more preferably 30 ⁇ m or less is used as a starting material for manufacturing a polarizing film. Film).
- a thin polarizing film whose market demand is increasing. The thinner the original film, the easier it is to break the film during the stretching process.
- the film can be effectively suppressed even when the original film is thin.
- the raw film may be a polyvinyl alcohol-based resin film that has been previously stretched in the gas phase.
- the width of the original film is not particularly limited and can be, for example, about 400 to 6000 mm. However, the larger the film width, the more likely the film breaks during the stretching process.
- the raw fabric film is prepared as a roll (raw fabric roll) of a long unstretched polyvinyl alcohol resin film.
- the polarizing film is a long film by carrying out a predetermined processing step by continuously conveying the long original film from the original film roll along the film conveying path of the polarizing film manufacturing apparatus. It can be continuously produced as a polarizing film.
- the predetermined treatment steps include a swelling treatment step in which the original film is dipped in a swelling bath, a drawing treatment step in which the film after the swelling treatment step is dipped in the dyeing bath, and a drawing treatment step in which the film after the dyeing treatment is drawn is a crosslinking bath. It is possible to include a cross-linking treatment step that is drawn out after being immersed in the substrate.
- a uniaxial stretching process is performed in a wet or dry manner between these series of processing steps (that is, before and after any one or more processing steps and / or during any one or more processing steps).
- Other processing steps may be added as necessary.
- Each of the above treatment steps may be a treatment of immersing the film in one bath or a treatment of sequentially immersing in two or more baths.
- FIG. 1 is a sectional view showing typically an example of the manufacturing method of the polarizing film concerning the present invention, and the polarizing film manufacturing device used for it.
- the polarizing film manufacturing apparatus shown in FIG. 1 transports a raw fabric (unstretched) film 10 made of polyvinyl alcohol resin along a film transport path while continuously unwinding from a raw fabric roll 11.
- a swelling bath 13, a dyeing bath 15, a crosslinking bath 17, and a washing bath 19 provided on the conveyance path are sequentially passed, and finally, a drying furnace 21 is passed.
- the obtained polarizing film 23 can be conveyed, for example, to the next polarizing plate production step (step of bonding a protective film on one or both sides of the polarizing film 23) as it is.
- the arrow in FIG. 1 has shown the conveyance direction of the film.
- FIG. 1 shows an example in which one bath is provided for each of the swelling bath 13, the dyeing bath 15, the crosslinking bath 17, and the washing bath 19, but if necessary, any one or more treatment baths (swelling bath 13).
- the baths containing the treatment liquid for treating the polyvinyl alcohol-based resin film provided on the film conveyance path, such as the dyeing bath 15, the crosslinking bath 17, and the washing bath 19, are also collectively referred to as “treatment bath”. .) May be provided in two or more tanks.
- the film transport path of the polarizing film manufacturing apparatus includes guide rolls 30 to 41, 60, 61 that can support the film to be transported or can further change the film transport direction in addition to the processing bath, and the film to be transported.
- Guide rolls and nip rolls can be arranged before and after each treatment bath or in the treatment bath, whereby the film can be introduced and immersed in the treatment bath and drawn out from the treatment bath (see FIG. 1). For example, by providing one or more guide rolls in each treatment bath and transporting the film along these guide rolls, the film can be immersed in each treatment bath.
- nip rolls are arranged before and after each treatment bath (nip rolls 50 to 54), whereby the nip rolls arranged before and after any one or more treatment baths. It is possible to perform inter-roll stretching in which longitudinal uniaxial stretching is performed with a difference in peripheral speed between them.
- each processing step will be described.
- the swelling treatment is performed for the purpose of removing foreign matter on the surface of the original film 10, removing the plasticizer in the original film 10, imparting easy dyeability, and plasticizing the original film 10.
- the processing conditions are determined within a range in which the object can be achieved and within a range in which problems such as extreme dissolution and devitrification of the raw film 10 do not occur.
- the original film 10 in the swelling treatment, the original film 10 is continuously unwound from the original roll 11 and conveyed along the film conveyance path, and the original film 10 is accommodated in the swelling bath 13 (swelled in a swelling tank). In the treated liquid) for a predetermined time and then withdrawing.
- the raw film 10 is conveyed along the film conveyance path constructed by the guide rolls 60 and 61 and the nip roll 50 until the original film 10 is unwound and immersed in the swelling bath 13. Is done.
- the film In the swelling process, the film is transported along the film transport path constructed by the guide rolls 30 to 32.
- the swelling bath 13 contains boric acid (JP-A-10-153709), chloride (JP-A-06-281816), inorganic acid, inorganic salt, water-soluble organic solvent, alcohols, and the like. It is also possible to use an aqueous solution added in the range of about 0.01 to 10% by weight.
- the temperature of the swelling bath 13 is, for example, about 10 to 50 ° C., preferably about 10 to 40 ° C., more preferably about 15 to 30 ° C.
- the immersion time of the raw film 10 is preferably about 10 to 300 seconds, more preferably about 20 to 200 seconds.
- the temperature of the swelling bath 13 is, for example, about 20 to 70 ° C., preferably about 30 to 60 ° C.
- the immersion time of the raw film 10 is preferably about 30 to 300 seconds, more preferably about 60 to 240 seconds.
- the curl angle at at least one of both ends in the film width direction when the raw film 10 is immersed in the swelling bath 13 is less than 90 °.
- the original film 10 unwound from the original roll 11 is usually in a state in which at least one of the both ends in the width direction (more typically both both ends in the width direction) is warped (floated), Alternatively, when the curl is further increased and curling occurs such that both ends in the width direction are warped toward the center in the width direction, the curl angle when the original film 10 is immersed in the swelling bath 13 is 90 °. By being less than this, film breakage during the stretching process can be suppressed.
- the curl angles at both ends in the film width direction are less than 90 °.
- the curl angle at at least one of both ends in the film width direction is preferably 80 ° or less, and more preferably less than 75 °. It is more preferable that the curl angles at both ends in the film width direction are less than 90 ° from immediately after being unwound from the raw fabric roll 11 until being immersed in the swelling bath 13.
- FIG. 2 is a film cross-sectional view schematically showing how the polyvinyl alcohol-based resin film curls and its curl angle.
- 2 shows an example in which both ends in the film width direction are curled.
- FIG. 2A shows a case where the curl angle is 45 °
- FIG. 2B shows a case where the curl angle is 90 °
- FIG. (C) has shown the case where a curl angle is 150 degrees.
- the curl angle is ⁇ °
- the end of the curled film portion is oriented in the direction of ⁇ ° with respect to the extrapolated surface of the non-curled film surface. That means.
- the curl angles at both ends in the width direction of the raw film 10 that is continuously immersed in the swelling bath 13 can be measured by the method described in the section of the examples.
- the curl angle at least one (preferably both) of the both ends of the film width direction when the original film 10 is immersed in the swelling bath 13 to be less than 90 °
- the atmosphere in the unwinding process from unwinding the original fabric film 10 from the original fabric roll 11 until being immersed in the swelling bath 13 is adjusted to an appropriate condition.
- Preferred atmospheric conditions are a temperature of 23 ⁇ 5 ° C. and a relative humidity of 20 to 70% RH.
- a more preferable relative humidity is 20 to 65% RH, and an even more preferable relative humidity is 25 to 60% RH.
- the time required for the unwinding step (the time from when the original film 10 is unwound from the original roll 11 to when it is immersed in the swelling bath 13) is kept short. Shortening the time is advantageous in suppressing curl growth during the unwinding process, and is also advantageous from the viewpoint of production efficiency. In general, the thinner the raw film, the easier the curl grows during the unwinding process.
- the required time is preferably 750 seconds or less, more preferably 600 seconds or less, and even more preferably 300 seconds or less when the original film 10 having a thickness of 35 ⁇ m to 65 ⁇ m is used.
- the raw film 10 having a thickness of less than 35 ⁇ m is used, it is preferably 650 seconds or less, more preferably 300 seconds or less, and even more preferably 150 seconds or less.
- the required time is usually 10 seconds or more, preferably 20 seconds or more. is there.
- drying process refers to a process of lowering the moisture content of the original film 10 by volatilizing the moisture in the original film 10.
- the drying treatment is advantageous in reducing or eliminating curling.
- it is necessary to perform a drying process so that the degree of dryness of the curled surface of the original film 10 (that is, the degree of decrease in moisture content due to drying) is smaller than the surface on the opposite side.
- the curled surface is a raw film surface including a surface on the inner side of the curl, and referring to FIG. 2, it is an upper main surface in the drawing.
- the substrate film 10 to be conveyed is subjected to a widening process.
- the widening treatment performed for the purpose of widening the film width is advantageous in reducing or eliminating curling when the raw film 10 is immersed in the swelling bath 13.
- Examples of the widening process include using a roll having a widening function such as an expander roll, a spiral roll, or a crown roll as a guide roll, or using another widening apparatus such as a cross guider, a bend bar, or a tenter clip. .
- a treatment using a roll having a widening function is preferable because it is simple.
- a roll having a widening function can be used as the guide rolls 60 and / or 61 shown in FIG. 1, a roll having a widening function can be used.
- the curled portion is forcibly pressed down on the transported original film 10.
- This treatment is also advantageous in reducing or eliminating curling when the raw film 10 is immersed in the swelling bath 13, as with the widening treatment.
- Specific methods include film transport using an apparatus such as a conveyor, a method of pressing a roll or bar (a rod-like object such as a roll that does not rotate itself) against a curled portion, air, nitrogen, Examples thereof include a method of injecting an inert gas with respect to the raw film 10 such as argon onto the curled portion.
- the maximum distance L between adjacent rolls is the largest value among the distances between adjacent rolls.
- the distance between adjacent rolls is determined as the distance between adjacent roll centers.
- the center of a line connecting the centers of a pair of rolls constituting the nip roll is employed instead of the roll center.
- L is usually 0.01 m or more, preferably 2 m or less, and more preferably 0.05 to 1.5 m.
- the maximum time T required for conveyance between adjacent rolls is the time required for conveyance between adjacent rolls (in the example of FIG. 1, time T 1 required for conveyance from the guide roll 60 to the guide roll 61, and This is the largest value of the time T 2 ) required for conveyance from the guide roll 61 to the nip roll 50.
- the time required for transporting between adjacent rolls is obtained as the time from leaving one of the adjacent rolls until contacting the other roll. T is usually 0.5 seconds or longer, preferably 30 seconds or shorter, and more preferably 0.1 to 20 seconds.
- the unwinding step usually, one or more nip rolls arranged before being immersed in the swelling bath are conveyed while keeping the tension of the original film 10 constant.
- the original roll 11 The tension applied to the raw film 10 between the nip roll and the nip roll disposed just before dipping in the swelling bath is made higher than the tension applied after the nip roll. Thereby, curl growth during the unwinding step can be suppressed.
- the tension applied to the original film 10 between the original roll 11 and the nip roll disposed immediately before being immersed in the swelling bath is, for example, 5 to 300 N / mm, and preferably 10 to 200 N / mm.
- the difference between the tension applied to the original film 10 between the original roll 11 and the nip roll disposed immediately before being immersed in the swelling bath and the tension applied after the nip roll is, for example, 10 N / m or more, preferably 50 N / m or more. That the tension of the original film 10 between the original roll 11 and the nip roll arranged immediately before being immersed in the swelling bath, and that the tension difference is within the above range, suppress the curling of the end of the original film 10. In addition to the above effect, it is also preferable from the viewpoint of suppressing the generation of wrinkles of the raw film 10.
- the raw film 10 swells in the width direction and the film is wrinkled.
- a roll having a widening function such as an expander roll, a spiral roll, or a crown roll is used for the guide rolls 30, 31 and / or 32, a cross guider, a bend bar. Or using other widening devices such as tenter clips.
- Another means for suppressing the generation of wrinkles is to perform stretching.
- the uniaxial stretching process can be performed in the swelling bath 13 by utilizing the peripheral speed difference between the nip roll 50 and the nip roll 51.
- the film swells and expands in the film conveyance direction. Therefore, when the film is not actively stretched, for example, it is disposed before and after the swelling bath 13 in order to eliminate the sag of the film in the conveyance direction. It is preferable to take measures such as controlling the speed of the nip rolls 50 and 51.
- the water flow in the swelling bath 13 is controlled by an underwater shower, or an EPC device (Edge Position Control device: detecting the edge of the film to meander the film. It is also useful to use a device for preventing the above in combination.
- the film drawn from the swelling bath 13 passes through the guide roll 32 and the nip roll 51 in this order and is introduced into the dyeing bath 15.
- the dyeing treatment is performed for the purpose of adsorbing and orienting the dichroic dye on the polyvinyl alcohol-based resin film after the swelling treatment.
- the processing conditions are determined within a range in which the object can be achieved and in a range in which defects such as extreme dissolution and devitrification of the film do not occur.
- the dyeing process is carried along a film carrying path constructed by guide rolls 33 to 35 and nip roll 51, and the film after swelling treatment is dyed in bath 15 (treatment liquid contained in a dyeing tank). ) For a predetermined time and then withdrawing.
- the film subjected to the dyeing treatment step is preferably a film subjected to at least some uniaxial stretching treatment, or instead of the uniaxial stretching treatment before the dyeing treatment, Alternatively, in addition to the uniaxial stretching process before the dyeing process, it is preferable to perform the uniaxial stretching process during the dyeing process.
- An aqueous solution can be used.
- potassium iodide other iodides such as zinc iodide may be used, or potassium iodide and other iodides may be used in combination.
- compounds other than iodide for example, boric acid, zinc chloride, cobalt chloride and the like may coexist. When boric acid is added, it is distinguished from the crosslinking treatment described later in terms of containing iodine.
- the dyeing bath 15 Can be considered.
- the temperature of the dyeing bath 15 when dipping the film is usually about 10 to 45 ° C., preferably 10 to 40 ° C., more preferably 20 to 35 ° C., and the dipping time of the film is usually 30 to 600 seconds. Degree, preferably 60 to 300 seconds.
- a water-soluble dichroic dye for example, an aqueous solution having a concentration of dichroic dye / water by weight ratio of about 0.001 to 0.1 / 100 is used for the dyeing bath 15. be able to.
- This dyeing bath 15 may contain a dyeing assistant or the like, and may contain, for example, an inorganic salt such as sodium sulfate or a surfactant. Only one dichroic dye may be used alone, or two or more dichroic dyes may be used in combination.
- the temperature of the dyeing bath 15 when dipping the film is, for example, about 20 to 80 ° C., preferably 30 to 70 ° C., and the dipping time of the film is usually about 30 to 600 seconds, preferably about 60 to 300 seconds. is there.
- the film can be uniaxially stretched in the dyeing bath 15 in the dyeing process. Uniaxial stretching of the film can be performed by a method of making a peripheral speed difference between the nip roll 51 and the nip roll 52 arranged before and after the dyeing bath 15.
- the widening function such as an expander roll, a spiral roll, or a crown roll is provided on the guide rolls 33, 34 and / or 35 in order to convey the polyvinyl alcohol resin film while removing the wrinkles of the film as in the swelling process.
- Another means for suppressing the generation of wrinkles is to perform a stretching process as in the swelling process.
- the film drawn from the dyeing bath 15 passes through the guide roll 35 and the nip roll 52 in this order and is introduced into the crosslinking bath 17.
- the crosslinking treatment is a treatment performed for the purpose of water resistance and hue adjustment (for example, preventing the film from being bluish) by crosslinking.
- the crosslinking treatment is carried along the film conveyance path constructed by the guide rolls 36 to 38 and the nip roll 52, and is subjected to the dyeing treatment in the crosslinking bath 17 (treatment liquid accommodated in the crosslinking tank). It can be carried out by immersing the film for a predetermined time and then withdrawing it.
- the crosslinking bath 17 can be an aqueous solution containing, for example, about 1 to 10 parts by weight of boric acid with respect to 100 parts by weight of water.
- the crosslinking bath 17 preferably contains iodide in addition to boric acid, and the amount is, for example, 1 to 30 weights per 100 weight parts of water.
- iodide include potassium iodide and zinc iodide.
- compounds other than iodide for example, zinc chloride, cobalt chloride, zirconium chloride, sodium thiosulfate, potassium sulfite, sodium sulfate and the like may coexist.
- the concentration of boric acid and iodide and the temperature of the crosslinking bath 17 can be appropriately changed depending on the purpose.
- the purpose of the crosslinking treatment is water resistance by crosslinking, and the polyvinyl alcohol resin film is subjected to swelling treatment, dyeing treatment and crosslinking treatment in this order
- the temperature of the crosslinking bath when dipping the film is usually about 50 to 70 ° C., preferably 53 to 65 ° C., and the dipping time of the film is usually about 10 to 600 seconds, preferably 20 to 300 seconds, more preferably. Is 20 to 200 seconds.
- the temperature of the crosslinking bath 17 is usually about 50 to 85 ° C., preferably 55 to 80 ° C. .
- a crosslinking agent containing boric acid / iodide / water 1 to 5/3 to 30/100 in terms of weight ratio is contained. Liquid can be used.
- the temperature of the crosslinking bath when dipping the film is usually about 10 to 45 ° C., and the dipping time of the film is usually about 1 to 300 seconds, preferably 2 to 100 seconds.
- the cross-linking treatment may be performed a plurality of times, usually 2 to 5 times.
- the composition and temperature of each crosslinking bath used may be the same or different as long as they are within the above range.
- the cross-linking treatment for water resistance by cross-linking and the cross-linking treatment for hue adjustment may be performed in a plurality of steps, respectively.
- the uniaxial stretching process can also be performed in the crosslinking bath 17 using the peripheral speed difference between the nip roll 52 and the nip roll 53.
- a widening function such as an expander roll, a spiral roll, or a crown roll is provided on the guide rolls 36, 37 and / or 38 in order to convey the polyvinyl alcohol resin film while removing the wrinkles of the film as in the swelling treatment.
- Can be used, or other widening devices such as cross guiders, bend bars, tenter clips can be used.
- Another means for suppressing the generation of wrinkles is to perform a stretching process as in the swelling process.
- the film drawn from the crosslinking bath 17 passes through the guide roll 38 and the nip roll 53 in this order and is introduced into the cleaning bath 19.
- the production method of the present invention can include a washing treatment step after the crosslinking treatment step.
- the washing treatment is performed for the purpose of removing excess chemicals such as boric acid and iodine adhering to the polyvinyl alcohol resin film.
- the washing treatment can be performed, for example, by immersing the crosslinked polyvinyl alcohol resin film in the washing bath 19 (water), spraying the film with water as a shower, or using these together.
- FIG. 1 shows an example in which a polyvinyl alcohol resin film is immersed in a cleaning bath 19 to perform a cleaning process.
- the temperature of the washing bath 19 in the washing treatment is usually about 2 to 40 ° C., and the immersion time of the film is usually about 2 to 120 seconds.
- a roll having a widening function such as an expander roll, a spiral roll, or a crown roll is used for the guide rolls 39, 40 and / or 41 for the purpose of conveying the polyvinyl alcohol resin film while removing wrinkles.
- other widening devices such as cross guiders, bend bars, tenter clips can be used.
- a stretching process may be performed in order to suppress generation of wrinkles.
- the raw film 10 is uniaxially stretched wet or dry during the series of processing steps (that is, before and after any one or more processing steps and / or during any one or more processing steps). It is processed.
- a specific method of the uniaxial stretching process is, for example, between rolls that perform longitudinal uniaxial stretching with a peripheral speed difference between two nip rolls (for example, two nip rolls arranged before and after the treatment bath) constituting the film conveyance path. Stretching, hot roll stretching as described in Japanese Patent No. 2731813, tenter stretching, and the like, and inter-roll stretching is preferred.
- the uniaxial stretching treatment step can be performed a plurality of times before the polarizing film 23 is obtained from the raw film 10. As described above, the stretching treatment is also advantageous for suppressing the generation of wrinkles on the film.
- the final cumulative draw ratio of the polarizing film 23 based on the original film 10 is usually about 4.5 to 7 times, preferably 5 to 6.5 times.
- the stretching treatment step may be performed in any processing step, and when the stretching treatment is performed in two or more processing steps, the stretching treatment may be performed in any processing step. According to the present invention, even when the uniaxial stretching process is performed at any stage after the swelling process (including the swelling process), the film breakage during the stretching process can be effectively suppressed.
- the drying of the film is not particularly limited, but can be performed using a drying furnace 21 as in the example shown in FIG.
- the drying temperature is, for example, about 30 to 100 ° C.
- the drying time is, for example, about 30 to 600 seconds.
- the thickness of the polarizing film 23 obtained as described above is, for example, about 5 to 30 ⁇ m.
- Processing other than the processing described above can also be added.
- treatments that can be added include immersion treatment (complementary color treatment) in an aqueous iodide solution that does not contain boric acid, and immersion treatment in an aqueous solution that does not contain boric acid and contains zinc chloride, etc. (zinc) Processing).
- a polarizing plate can be obtained by bonding a protective film via an adhesive on at least one surface of the polarizing film produced as described above.
- a protective film for example, a film made of an acetyl cellulose resin such as triacetyl cellulose or diacetyl cellulose; a film made of a polyester resin such as polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate; a polycarbonate resin film; Examples include olefin-based resin films; (meth) acrylic-based resin films; and films made of polypropylene-based chain olefin-based resins.
- (meth) acryl means at least one selected from acrylic and methacrylic.
- an adhesive used for laminating a polarizing film and a protective film an active energy ray curable adhesive such as an ultraviolet curable adhesive, an aqueous solution of a polyvinyl alcohol resin, or an aqueous solution in which a crosslinking agent is blended.
- water-based adhesives such as urethane emulsion adhesives.
- the ultraviolet curable adhesive may be a mixture of a (meth) acrylic compound and a radical photopolymerization initiator, a mixture of an epoxy compound and a cationic photopolymerization initiator, or the like. Further, a cationic polymerizable epoxy compound and a radical polymerizable (meth) acrylic compound may be used in combination, and a photo cationic polymerization initiator and a photo radical polymerization initiator may be used in combination as an initiator.
- the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.
- the curl angles at both ends in the width direction of the raw film 10 continuously immersed in the swelling bath 13 were measured by the following method.
- Example 1 An apparatus similar to the polarizing film manufacturing apparatus shown in FIG. 1 except that two crosslinking baths 17 (hereinafter, the first crosslinking bath is referred to as 17a and the second crosslinking bath is referred to as 17b) are used.
- 17a the first crosslinking bath
- 17b the second crosslinking bath
- All the guide rolls 30 to 41 were flat rolls.
- the film after the second crosslinking treatment was immersed in a cleaning bath 19 containing pure water at 6 ° C., and then dried at 70 ° C. for 3 minutes by passing through a drying furnace 21 to produce a polarizing film 23. .
- Example 2 Polarizing film production was carried out continuously for 24 hours in the same manner as in Example 1 except that the temperature in the unwinding step was 23 ° C. and the relative humidity was 40% RH. From the time the polyvinyl alcohol film was unwound from the raw roll 11 until it was immersed in the swelling bath 13, the curl angle at both ends in the film width direction was 15 ° or less. During operation for 24 hours, no film breakage occurred in any of the treatment steps, and no folding at both ends in the film width direction was observed.
- Example 3 A polyvinyl alcohol film having a thickness of 30 ⁇ m (trade name “Kuraray Poval Film VF-PE # 3000” manufactured by Kuraray Co., Ltd., polymerization degree 2400, saponification degree 99.9 mol% or more) was used as a raw film.
- the polarizing film was continuously manufactured for 24 hours. From the time the polyvinyl alcohol film was unwound from the raw fabric roll 11 until it was immersed in the swelling bath 13, the curl angle at both ends in the film width direction was 60 ° or less. During operation for 24 hours, no film breakage occurred in any of the treatment steps, and no folding at both ends in the film width direction was observed.
- Example 4 A polarizing film was continuously produced for 24 hours in the same manner as in Example 3 except that the time for the unwinding step was 480 seconds. From the time the polyvinyl alcohol film was unwound from the raw roll 11 until it was immersed in the swelling bath 13, the curl angle at both ends in the film width direction was 75 ° or less. During operation for 24 hours, no film breakage occurred in any of the treatment steps, and no folding at both ends in the film width direction was observed.
- Example 5 A polarizing film was continuously produced for 24 hours in the same manner as in Example 1 except that the time for the unwinding step was 600 seconds. From the time the polyvinyl alcohol film was unwound from the raw fabric roll 11 until it was immersed in the swelling bath 13, the curl angle at both ends in the film width direction was 60 ° or less. During operation for 24 hours, no film breakage occurred in any of the treatment steps, and no folding at both ends in the film width direction was observed.
- Example 6> A polarizing film was continuously produced for 24 hours in the same manner as in Example 1 except that the time for the unwinding step was 720 seconds. From the time the polyvinyl alcohol film was unwound from the raw roll 11 until it was immersed in the swelling bath 13, the curl angle at both ends in the film width direction was 75 ° or less. During operation for 24 hours, no film breakage occurred in any of the treatment steps, and no folding at both ends in the film width direction was observed.
- Example 7 A polarizing film was continuously produced for 24 hours in the same manner as in Example 3 except that the time for the unwinding step was 600 seconds. From the time the polyvinyl alcohol film was unwound from the raw roll 11 until it was immersed in the swelling bath 13, the curl angle at both ends in the film width direction was 75 ° or less. During operation for 24 hours, no film breakage occurred in any of the treatment steps, and no folding at both ends in the film width direction was observed.
- Example 1 A polarizing film was produced in the same manner as in Example 3 except that the unwinding time was 720 seconds.
- the curl angle at both ends in the film width direction when the polyvinyl alcohol film was immersed in the swelling bath 13 was 105 °.
- the film was broken during the stretching treatment in the crosslinking treatment, and a polarizing film could not be obtained.
- Example 8> Other than having blown hot air of 30 ° C. for 30 seconds from the surface opposite to the curled surface of the polyvinyl alcohol film after the polyvinyl alcohol film was unwound from the roll 11 and immersed in the swelling bath 13.
- the polarizing film was continuously produced for 24 hours. From the time the polyvinyl alcohol film was unwound from the raw roll 11 until it was immersed in the swelling bath 13, the curl angle at both ends in the film width direction was 75 ° or less. During operation for 24 hours, no film breakage occurred in any of the treatment steps, and no folding at both ends in the film width direction was observed.
- Example 9> Just as in Comparative Example 1, except that a metal bar for pressing both ends in the film width direction was installed immediately before the nip roll 50 in the unwinding step, and the widening process was performed on both ends in the width direction of the polyvinyl alcohol film. Then, the polarizing film was continuously manufactured for 24 hours. From the time the polyvinyl alcohol film was unwound from the raw fabric roll 11 until it was immersed in the swelling bath 13, the curl angle at both ends in the film width direction was 60 ° or less. During operation for 24 hours, no film breakage occurred in any of the treatment steps, and no folding at both ends in the film width direction was observed.
- Example 10> A polarizing film was continuously produced for 24 hours in the same manner as in Example 3 except that the time for the unwinding step was 300 seconds. From the time the polyvinyl alcohol film was unwound from the raw roll 11 until it was immersed in the swelling bath 13, the curl angle at both ends in the film width direction was 45 ° or less. During operation for 24 hours, no film breakage occurred in any of the treatment steps, and no folding at both ends in the film width direction was observed.
- Polarizing film production was carried out continuously for 24 hours in the same manner as in Example 3 except that the time for the unwinding step was 150 seconds. From the time the polyvinyl alcohol film was unwound from the raw roll 11 until it was immersed in the swelling bath 13, the curl angle at both ends in the film width direction was 45 ° or less. During operation for 24 hours, no film breakage occurred in any of the treatment steps, and no folding at both ends in the film width direction was observed.
Abstract
Description
[1] 厚みが65μm以下である長尺のポリビニルアルコール系樹脂フィルムを原反ロールから巻出しつつ搬送させることにより、前記ポリビニルアルコール系樹脂フィルムを膨潤浴に浸漬させた後に引き出す膨潤処理工程と、
膨潤浴から引き出されたフィルムを染色浴に浸漬させた後に引き出す染色処理工程と、
をこの順に含み、
前記ポリビニルアルコール系樹脂フィルムが膨潤浴に浸漬するときのフィルム幅方向両端部の少なくとも一方におけるカール角度が90°未満である、偏光フィルムの製造方法。 This invention provides the manufacturing method of the polarizing film shown below.
[1] A swelling treatment step of drawing out the polyvinyl alcohol-based resin film after immersing the polyvinyl alcohol-based resin film in a swelling bath by conveying a long polyvinyl alcohol-based resin film having a thickness of 65 μm or less while being unwound from a raw fabric roll;
A dyeing treatment step of drawing out the film drawn from the swelling bath after being immersed in the dyeing bath;
In this order,
The manufacturing method of a polarizing film whose curl angle in at least one of the film width direction both ends when the said polyvinyl alcohol-type resin film immerses in a swelling bath is less than 90 degrees.
前記2以上のロールに関し、隣り合うロール間の距離の最大値をL、隣り合うロール間の搬送に要する時間の最大値をTとするとき、Lが2m以下であるか、又はTが30秒以下である、[1]~[5]のいずれかに記載の製造方法。 [6] In the swelling treatment step, the polyvinyl alcohol-based resin film unwound from the raw fabric roll is immersed in a swelling bath by being conveyed along two or more rolls selected from a guide roll and a nip roll,
Regarding the two or more rolls, L is 2 m or less, or T is 30 seconds, where L is the maximum distance between adjacent rolls and T is the maximum time required for conveyance between adjacent rolls. The production method according to any one of [1] to [5], which is as follows.
本発明において偏光フィルムは、一軸延伸されたポリビニルアルコール系樹脂フィルムに二色性色素(ヨウ素や二色性染料)が吸着配向しているものである。ポリビニルアルコール系樹脂フィルムを構成するポリビニルアルコール系樹脂は通常、ポリ酢酸ビニル系樹脂をケン化することにより得られる。そのケン化度は、通常約85モル%以上、好ましくは約90モル%以上、より好ましくは約99モル%以上である。ポリ酢酸ビニル系樹脂は、例えば、酢酸ビニルの単独重合体であるポリ酢酸ビニルの他、酢酸ビニルとこれに共重合可能な他の単量体との共重合体等であることができる。共重合可能な他の単量体としては、例えば、不飽和カルボン酸類、オレフィン類、ビニルエーテル類、不飽和スルホン酸類等を挙げることができる。ポリビニルアルコール系樹脂の重合度は、通常約1000~10000、好ましくは約1500~5000程度である。 <Production method of polarizing film>
In the present invention, the polarizing film is one in which a dichroic dye (iodine or dichroic dye) is adsorbed and oriented on a uniaxially stretched polyvinyl alcohol resin film. The polyvinyl alcohol-based resin constituting the polyvinyl alcohol-based resin film is usually obtained by saponifying a polyvinyl acetate-based resin. The degree of saponification is usually about 85 mol% or more, preferably about 90 mol% or more, more preferably about 99 mol% or more. The polyvinyl acetate resin can be, for example, a copolymer of vinyl acetate, which is a homopolymer of vinyl acetate, or a copolymer of vinyl acetate and another monomer copolymerizable therewith. Examples of other copolymerizable monomers include unsaturated carboxylic acids, olefins, vinyl ethers, and unsaturated sulfonic acids. The degree of polymerization of the polyvinyl alcohol resin is usually about 1000 to 10,000, preferably about 1500 to 5,000.
膨潤処理は、原反フィルム10表面の異物除去、原反フィルム10中の可塑剤除去、易染色性の付与、原反フィルム10の可塑化等の目的で行われる。処理条件は、当該目的が達成できる範囲で、かつ原反フィルム10の極端な溶解や失透等の不具合を生じない範囲で決定される。 (Swelling treatment)
The swelling treatment is performed for the purpose of removing foreign matter on the surface of the
染色処理は、膨潤処理後のポリビニルアルコール系樹脂フィルムに二色性色素を吸着、配向させる等の目的で行われる。処理条件は、当該目的が達成できる範囲で、かつフィルムの極端な溶解や失透等の不具合が生じない範囲で決定される。図1を参照して、染色処理は、ガイドロール33~35及びニップロール51によって構築されたフィルム搬送経路に沿って搬送させ、膨潤処理後のフィルムを染色浴15(染色槽に収容された処理液)に所定時間浸漬し、次いで引き出すことによって実施することができる。二色性色素の染色性を高めるために、染色処理工程に供されるフィルムは、少なくともある程度の一軸延伸処理を施したフィルムであることが好ましく、又は染色処理前の一軸延伸処理の代わりに、あるいは染色処理前の一軸延伸処理に加えて、染色処理時に一軸延伸処理を行うことが好ましい。 (Dyeing process)
The dyeing treatment is performed for the purpose of adsorbing and orienting the dichroic dye on the polyvinyl alcohol-based resin film after the swelling treatment. The processing conditions are determined within a range in which the object can be achieved and in a range in which defects such as extreme dissolution and devitrification of the film do not occur. Referring to FIG. 1, the dyeing process is carried along a film carrying path constructed by guide rolls 33 to 35 and nip
架橋処理は、架橋による耐水化や色相調整(フィルムが青味がかるのを防止する等)などの目的で行う処理である。図1を参照して、架橋処理は、ガイドロール36~38及びニップロール52によって構築されたフィルム搬送経路に沿って搬送させ、架橋浴17(架橋槽に収容された処理液)に染色処理後のフィルムを所定時間浸漬し、次いで引き出すことによって実施することができる。 (Crosslinking treatment)
The crosslinking treatment is a treatment performed for the purpose of water resistance and hue adjustment (for example, preventing the film from being bluish) by crosslinking. Referring to FIG. 1, the crosslinking treatment is carried along the film conveyance path constructed by the guide rolls 36 to 38 and the
本発明の製造方法は、架橋処理工程後の洗浄処理工程を含むことができる。洗浄処理は、ポリビニルアルコール系樹脂フィルムに付着した余分なホウ酸やヨウ素等の薬剤を除去する目的で行われる。洗浄処理は、例えば、架橋処理したポリビニルアルコール系樹脂フィルムを洗浄浴19(水)に浸漬、又は該フィルムに対して水をシャワーとして噴霧、若しくはこれらを併用することによって行うことができる。 (Cleaning process)
The production method of the present invention can include a washing treatment step after the crosslinking treatment step. The washing treatment is performed for the purpose of removing excess chemicals such as boric acid and iodine adhering to the polyvinyl alcohol resin film. The washing treatment can be performed, for example, by immersing the crosslinked polyvinyl alcohol resin film in the washing bath 19 (water), spraying the film with water as a shower, or using these together.
上述のように原反フィルム10は、上記一連の処理工程の間(すなわち、いずれか1以上の処理工程の前後及び/又はいずれか1以上の処理工程中)に、湿式又は乾式にて一軸延伸処理される。一軸延伸処理の具体的方法は、例えば、フィルム搬送経路を構成する2つのニップロール(例えば、処理浴の前後に配置される2つのニップロール)間に周速差をつけて縦一軸延伸を行うロール間延伸、特許第2731813号公報に記載されるような熱ロール延伸、テンター延伸等であることができ、好ましくはロール間延伸である。一軸延伸処理工程は、原反フィルム10から偏光フィルム23を得るまでの間に複数回にわたって実施することができる。上述のように延伸処理は、フィルムのシワの発生の抑制にも有利である。 (Extension process)
As described above, the
洗浄処理の後、ポリビニルアルコール系樹脂フィルムを乾燥させる処理を行うことが好ましい。フィルムの乾燥は特に制限されないが、図1に示される例のように乾燥炉21を用いて行うことができる。乾燥温度は、例えば30~100℃程度であり、乾燥時間は、例えば30~600秒程度である。以上のようにして得られる偏光フィルム23の厚みは、例えば約5~30μm程度である。 (Drying process)
It is preferable to perform the process which dries a polyvinyl-alcohol-type resin film after a washing process. The drying of the film is not particularly limited, but can be performed using a drying
上記した処理以外の処理を付加することもできる。追加されうる処理の例は、架橋処理の後に行われる、ホウ酸を含まないヨウ化物水溶液への浸漬処理(補色処理)、ホウ酸を含まず塩化亜鉛等を含有する水溶液への浸漬処理(亜鉛処理)を含む。 (Other processing steps)
Processing other than the processing described above can also be added. Examples of treatments that can be added include immersion treatment (complementary color treatment) in an aqueous iodide solution that does not contain boric acid, and immersion treatment in an aqueous solution that does not contain boric acid and contains zinc chloride, etc. (zinc) Processing).
以上のようにして製造される偏光フィルムの少なくとも片面に、接着剤を介して保護フィルムを貼合することにより偏光板を得ることができる。保護フィルムとしては、例えば、トリアセチルセルロースやジアセチルセルロースのようなアセチルセルロース系樹脂からなるフィルム;ポリエチレンテレフタレート、ポリエチレンナフタレート及びポリブチレンテレフタレートのようなポリエステル系樹脂からなるフィルム;ポリカーボネート系樹脂フィルム;シクロオレフィン系樹脂フィルム;(メタ)アクリル系樹脂フィルム;ポリプロピレン系樹脂の鎖状オレフィン系樹脂からなるフィルムが挙げられる。 <Polarizing plate>
A polarizing plate can be obtained by bonding a protective film via an adhesive on at least one surface of the polarizing film produced as described above. As a protective film, for example, a film made of an acetyl cellulose resin such as triacetyl cellulose or diacetyl cellulose; a film made of a polyester resin such as polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate; a polycarbonate resin film; Examples include olefin-based resin films; (meth) acrylic-based resin films; and films made of polypropylene-based chain olefin-based resins.
膨潤浴13へ浸漬する直前に通過したロールから膨潤浴13中の最初のガイドロールの方向に沿ってフィルムを目視し、フィルムが浸漬する直前の位置に設置した角度の目印に従いフィルム端部先端が示す角度領域を15°毎に測定した(例えば角度領域が0°以上15°未満のとき、測定角度は0°となり、角度領域が15°以上30°未満のとき、測定角度は15°といったように、測定角度は角度領域の最小値となる。以下同様。)。また、巻出し直後から膨潤浴13に浸漬する前に通過するロールの直前にも角度目印を設置し、同様にカール角度の測定を行った。 [Measurement of curl angle]
The film is visually observed along the direction of the first guide roll in the swelling
2つの架橋浴17(以下では、1つ目の架橋浴を17aといい、2つ目の架橋浴を17bという。)を用いたこと以外は図1に示される偏光フィルム製造装置と同様の装置を用いて偏光フィルムを製造した。ガイドロール30~41にはすべてフラットロールを使用した。 <Example 1>
An apparatus similar to the polarizing film manufacturing apparatus shown in FIG. 1 except that two crosslinking baths 17 (hereinafter, the first crosslinking bath is referred to as 17a and the second crosslinking bath is referred to as 17b) are used. Was used to produce a polarizing film. All the guide rolls 30 to 41 were flat rolls.
厚み60μmのポリビニルアルコールフィルム〔(株)クラレ製の商品名「クラレポバールフィルムVF-PE#6000」、重合度2400、ケン化度99.9モル%以上〕を原反ロール11より連続的に巻出しながら搬送し、30℃の純水が入った膨潤浴13に、フィルムが弛まないように緊張状態を保ったまま100秒間浸漬した。ポリビニルアルコールフィルムを原反ロール11より巻出してから膨潤浴13に浸漬するまでの時間(巻出し工程の時間)は60秒、巻出し工程における雰囲気は温度23℃、相対湿度60%RHであった。また、ポリビニルアルコールフィルムを原反ロール11より巻出してから膨潤浴13に浸漬するまでを通じて、フィルム幅方向両端部のカール角度は30°以下であった。 (1) Swelling treatment process Raw material roll of polyvinyl alcohol film [trade name “Kuraray Poval Film VF-PE # 6000” manufactured by Kuraray Co., Ltd., polymerization degree 2400, saponification degree 99.9 mol% or more] having a thickness of 60 μm The film was conveyed while being continuously unwound from 11, and immersed in a swelling
次に、ニップロール51を通過したフィルムを、ヨウ素/ヨウ化カリウム/水(重量比)が0.05/2/100である30℃の染色浴15に120秒間浸漬した。この染色処理では、ニップロール51,52間に周速差をつけてロール間延伸(縦一軸延伸)を行った。 (2) Dyeing process Next, the film which passed the
次に、耐水化を目的とする第1の架橋処理を施すため、ニップロール52を通過したフィルムを、ヨウ化カリウム/ホウ酸/水(重量比)が12/4.4/100である56℃の第1架橋浴17aに30秒間浸漬した。この第1の架橋処理においても、ニップロール間に周速差をつけて、原反フィルム10を基準とする累積延伸倍率が5.5倍になるまでロール間延伸(縦一軸延伸)を行った。次いで、第1の架橋処理後のフィルムを、ヨウ化カリウム/ホウ酸/水(重量比)が9/2.9/100である40℃の第2架橋浴17bに15秒間浸漬した(第2の架橋処理)。 (3) Crosslinking treatment step Next, in order to perform the first crosslinking treatment for the purpose of water resistance, the film that has passed through the
巻出し工程における雰囲気を温度23℃、相対湿度40%RHとしたこと以外は実施例1と同様にして、偏光フィルム製造を連続して24時間実施した。ポリビニルアルコールフィルムを原反ロール11より巻出してから膨潤浴13に浸漬するまでを通じて、フィルム幅方向両端部のカール角度は15°以下であった。24時間の稼働中、いずれの処理工程においてもフィルム破断は起こらず、フィルム幅方向両端部の折れ込みも認められなかった。 <Example 2>
Polarizing film production was carried out continuously for 24 hours in the same manner as in Example 1 except that the temperature in the unwinding step was 23 ° C. and the relative humidity was 40% RH. From the time the polyvinyl alcohol film was unwound from the
厚み30μmのポリビニルアルコールフィルム〔(株)クラレ製の商品名「クラレポバールフィルムVF-PE#3000」、重合度2400、ケン化度99.9モル%以上〕を原反フィルムとして用いたこと以外は実施例1と同様にして、偏光フィルム製造を連続して24時間実施した。ポリビニルアルコールフィルムを原反ロール11より巻出してから膨潤浴13に浸漬するまでを通じて、フィルム幅方向両端部のカール角度は60°以下であった。24時間の稼働中、いずれの処理工程においてもフィルム破断は起こらず、フィルム幅方向両端部の折れ込みも認められなかった。 <Example 3>
A polyvinyl alcohol film having a thickness of 30 μm (trade name “Kuraray Poval Film VF-PE # 3000” manufactured by Kuraray Co., Ltd., polymerization degree 2400, saponification degree 99.9 mol% or more) was used as a raw film. In the same manner as in Example 1, the polarizing film was continuously manufactured for 24 hours. From the time the polyvinyl alcohol film was unwound from the
巻出し工程の時間を480秒としたこと以外は実施例3と同様にして、偏光フィルム製造を連続して24時間実施した。ポリビニルアルコールフィルムを原反ロール11より巻出してから膨潤浴13に浸漬するまでを通じて、フィルム幅方向両端部のカール角度は75°以下であった。24時間の稼働中、いずれの処理工程においてもフィルム破断は起こらず、フィルム幅方向両端部の折れ込みも認められなかった。 <Example 4>
A polarizing film was continuously produced for 24 hours in the same manner as in Example 3 except that the time for the unwinding step was 480 seconds. From the time the polyvinyl alcohol film was unwound from the
巻出し工程の時間を600秒としたこと以外は実施例1と同様にして、偏光フィルム製造を連続して24時間実施した。ポリビニルアルコールフィルムを原反ロール11より巻出してから膨潤浴13に浸漬するまでを通じて、フィルム幅方向両端部のカール角度は60°以下であった。24時間の稼働中、いずれの処理工程においてもフィルム破断は起こらず、フィルム幅方向両端部の折れ込みも認められなかった。 <Example 5>
A polarizing film was continuously produced for 24 hours in the same manner as in Example 1 except that the time for the unwinding step was 600 seconds. From the time the polyvinyl alcohol film was unwound from the
巻出し工程の時間を720秒としたこと以外は実施例1と同様にして、偏光フィルム製造を連続して24時間実施した。ポリビニルアルコールフィルムを原反ロール11より巻出してから膨潤浴13に浸漬するまでを通じて、フィルム幅方向両端部のカール角度は75°以下であった。24時間の稼働中、いずれの処理工程においてもフィルム破断は起こらず、フィルム幅方向両端部の折れ込みも認められなかった。 <Example 6>
A polarizing film was continuously produced for 24 hours in the same manner as in Example 1 except that the time for the unwinding step was 720 seconds. From the time the polyvinyl alcohol film was unwound from the
巻出し工程の時間を600秒としたこと以外は実施例3と同様にして、偏光フィルム製造を連続して24時間実施した。ポリビニルアルコールフィルムを原反ロール11より巻出してから膨潤浴13に浸漬するまでを通じて、フィルム幅方向両端部のカール角度は75°以下であった。24時間の稼働中、いずれの処理工程においてもフィルム破断は起こらず、フィルム幅方向両端部の折れ込みも認められなかった。 <Example 7>
A polarizing film was continuously produced for 24 hours in the same manner as in Example 3 except that the time for the unwinding step was 600 seconds. From the time the polyvinyl alcohol film was unwound from the
巻出し工程の時間を720秒としたこと以外は実施例3と同様にして、偏光フィルムの製造を行った。ポリビニルアルコールフィルムが膨潤浴13に浸漬するときのフィルム幅方向両端部のカール角度は105°であった。架橋処理における延伸処理時にフィルムの破断が生じ偏光フィルムを得ることができなかった。 <Comparative Example 1>
A polarizing film was produced in the same manner as in Example 3 except that the unwinding time was 720 seconds. The curl angle at both ends in the film width direction when the polyvinyl alcohol film was immersed in the swelling
ポリビニルアルコールフィルムを原反ロール11より巻出してから膨潤浴13に浸漬するまでの間に、ポリビニルアルコールフィルムのカール面とは反対側の面側から30℃の温風を30秒間吹き付けたこと以外は比較例1と同様にして、偏光フィルム製造を連続して24時間実施した。ポリビニルアルコールフィルムを原反ロール11より巻出してから膨潤浴13に浸漬するまでを通じて、フィルム幅方向両端部のカール角度は75°以下であった。24時間の稼働中、いずれの処理工程においてもフィルム破断は起こらず、フィルム幅方向両端部の折れ込みも認められなかった。 <Example 8>
Other than having blown hot air of 30 ° C. for 30 seconds from the surface opposite to the curled surface of the polyvinyl alcohol film after the polyvinyl alcohol film was unwound from the
巻出し工程のニップロール50の直前に、フィルム幅方向両端部を押さえ付けるための金属製のバーを設置し、ポリビニルアルコールフィルムの幅方向両端部の拡幅処理を行ったこと以外は比較例1と同様にして、偏光フィルム製造を連続して24時間実施した。ポリビニルアルコールフィルムを原反ロール11より巻出してから膨潤浴13に浸漬するまでを通じて、フィルム幅方向両端部のカール角度は60°以下であった。24時間の稼働中、いずれの処理工程においてもフィルム破断は起こらず、フィルム幅方向両端部の折れ込みも認められなかった。 <Example 9>
Just as in Comparative Example 1, except that a metal bar for pressing both ends in the film width direction was installed immediately before the
巻出し工程の時間を300秒としたこと以外は実施例3と同様にして、偏光フィルム製造を連続して24時間実施した。ポリビニルアルコールフィルムを原反ロール11より巻出してから膨潤浴13に浸漬するまでを通じて、フィルム幅方向両端部のカール角度は45°以下であった。24時間の稼働中、いずれの処理工程においてもフィルム破断は起こらず、フィルム幅方向両端部の折れ込みも認められなかった。 <Example 10>
A polarizing film was continuously produced for 24 hours in the same manner as in Example 3 except that the time for the unwinding step was 300 seconds. From the time the polyvinyl alcohol film was unwound from the
巻出し工程の時間を150秒としたこと以外は実施例3と同様にして、偏光フィルム製造を連続して24時間実施した。ポリビニルアルコールフィルムを原反ロール11より巻出してから膨潤浴13に浸漬するまでを通じて、フィルム幅方向両端部のカール角度は45°以下であった。24時間の稼働中、いずれの処理工程においてもフィルム破断は起こらず、フィルム幅方向両端部の折れ込みも認められなかった。 <Example 11>
Polarizing film production was carried out continuously for 24 hours in the same manner as in Example 3 except that the time for the unwinding step was 150 seconds. From the time the polyvinyl alcohol film was unwound from the
Claims (6)
- 厚みが65μm以下である長尺のポリビニルアルコール系樹脂フィルムを原反ロールから巻出しつつ搬送させることにより、前記ポリビニルアルコール系樹脂フィルムを膨潤浴に浸漬させた後に引き出す膨潤処理工程と、
膨潤浴から引き出されたフィルムを染色浴に浸漬させた後に引き出す染色処理工程と、
をこの順に含み、
前記ポリビニルアルコール系樹脂フィルムが膨潤浴に浸漬するときのフィルム幅方向両端部の少なくとも一方におけるカール角度が90°未満である、偏光フィルムの製造方法。 A swelling treatment step of drawing out the polyvinyl alcohol-based resin film after immersing the polyvinyl alcohol-based resin film in a swelling bath by conveying the long polyvinyl alcohol-based resin film having a thickness of 65 μm or less while being unwound from the raw fabric roll;
A dyeing treatment step of drawing out the film drawn from the swelling bath after being immersed in the dyeing bath;
In this order,
The manufacturing method of a polarizing film whose curl angle in at least one of the film width direction both ends when the said polyvinyl alcohol-type resin film immerses in a swelling bath is less than 90 degrees. - 前記ポリビニルアルコール系樹脂フィルムを原反ロールより巻出してから膨潤浴に浸漬するまでの時間が750秒以下である、請求項1に記載の製造方法。 The production method according to claim 1, wherein the time from when the polyvinyl alcohol-based resin film is unwound from the raw roll to when it is immersed in the swelling bath is 750 seconds or less.
- 前記ポリビニルアルコール系樹脂フィルムを原反ロールより巻出してから膨潤浴に浸漬するまでの間に、前記ポリビニルアルコール系樹脂フィルムに対して乾燥処理を施す、請求項1又は2に記載の製造方法。 The manufacturing method according to claim 1 or 2, wherein the polyvinyl alcohol-based resin film is subjected to a drying process after the polyvinyl alcohol-based resin film is unwound from a raw fabric roll and immersed in a swelling bath.
- 前記ポリビニルアルコール系樹脂フィルムにおけるカール面の乾燥度がその反対側の面よりも小さくなるように前記乾燥処理を施す、請求項3に記載の製造方法。 The manufacturing method according to claim 3, wherein the drying treatment is performed so that the degree of drying of the curled surface of the polyvinyl alcohol-based resin film is smaller than that of the opposite surface.
- 前記ポリビニルアルコール系樹脂フィルムを原反ロールより巻出してから膨潤浴に浸漬するまでの間に、前記ポリビニルアルコール系樹脂フィルムに対して拡幅処理を施す、請求項1~4のいずれか1項に記載の製造方法。 5. The widening treatment is applied to the polyvinyl alcohol resin film between the time when the polyvinyl alcohol resin film is unwound from a raw roll and immersed in a swelling bath. The manufacturing method as described.
- 前記膨潤処理工程において、原反ロールより巻出した前記ポリビニルアルコール系樹脂フィルムを、ガイドロール及びニップロールから選択される2以上のロールに沿って搬送させることより膨潤浴に浸漬させ、
前記2以上のロールに関し、隣り合うロール間の距離の最大値をL、隣り合うロール間の搬送に要する時間の最大値をTとするとき、Lが2m以下であるか、又はTが30秒以下である、請求項1~5のいずれか1項に記載の製造方法。 In the swelling treatment step, the polyvinyl alcohol-based resin film unwound from the raw roll is immersed in a swelling bath by being conveyed along two or more rolls selected from a guide roll and a nip roll,
Regarding the two or more rolls, L is 2 m or less, or T is 30 seconds, where L is the maximum distance between adjacent rolls and T is the maximum time required for conveyance between adjacent rolls. The production method according to any one of claims 1 to 5, which is as follows.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020177003283A KR101990222B1 (en) | 2014-08-04 | 2015-07-27 | Production method for polarizing film |
CN201580040056.2A CN106575008B (en) | 2014-08-04 | 2015-07-27 | Method for producing polarizing film |
JP2016540157A JP6294491B2 (en) | 2014-08-04 | 2015-07-27 | Manufacturing method of polarizing film |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014-158497 | 2014-08-04 | ||
JP2014158497 | 2014-08-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016021432A1 true WO2016021432A1 (en) | 2016-02-11 |
Family
ID=55263703
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2015/071223 WO2016021432A1 (en) | 2014-08-04 | 2015-07-27 | Production method for polarizing film |
Country Status (5)
Country | Link |
---|---|
JP (3) | JP6294491B2 (en) |
KR (1) | KR101990222B1 (en) |
CN (1) | CN106575008B (en) |
TW (1) | TWI654225B (en) |
WO (1) | WO2016021432A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019035956A (en) * | 2017-08-16 | 2019-03-07 | 住友化学株式会社 | Polarizing film manufacturing method and manufacturing system |
JP2022022085A (en) * | 2020-07-22 | 2022-02-03 | 住友化学株式会社 | Method for manufacturing polarization film and polyvinyl alcohol film |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7083611B2 (en) * | 2017-09-26 | 2022-06-13 | 住友化学株式会社 | Film transport method and transport device, and processed film manufacturing method and manufacturing device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001315140A (en) * | 2000-05-09 | 2001-11-13 | Kuraray Co Ltd | Polyvinyl alcohol polymer film, method for manufacturing the same, and polarizing film |
JP2002030162A (en) * | 2000-07-17 | 2002-01-31 | Kuraray Co Ltd | Polyvinyl alcohol film and polarizing film |
JP2004020635A (en) * | 2002-06-12 | 2004-01-22 | Kuraray Co Ltd | Manufacturing method of polyvinyl alcohol film for optical use |
WO2014084154A1 (en) * | 2012-11-30 | 2014-06-05 | 株式会社クラレ | Multilayer film |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5426582B1 (en) * | 1970-08-26 | 1979-09-05 | ||
JP4323269B2 (en) * | 2003-09-10 | 2009-09-02 | 住友化学株式会社 | Manufacturing method of polarizing film |
JP2005227650A (en) * | 2004-02-16 | 2005-08-25 | Sumitomo Chemical Co Ltd | Manufacturing method of polarizing film, polarizing plate and optical laminate |
JP2006282918A (en) * | 2005-04-04 | 2006-10-19 | Masahiko Nose | Method and device for dyeing polyvinyl alcohol film, method and device for producing polarizing film, and polarlizing film and polarizing plate |
JP4697964B2 (en) * | 2006-02-24 | 2011-06-08 | 日東電工株式会社 | Polarizer manufacturing method and cleaning apparatus |
JP2008241910A (en) * | 2007-03-26 | 2008-10-09 | Nitto Denko Corp | Method of manufacturing polarizing film |
JP2008281877A (en) * | 2007-05-11 | 2008-11-20 | Nitto Denko Corp | Manufacturing method of polarizer, polarizer, polarizing plate, optical film and image display apparatus |
JP2009063829A (en) * | 2007-09-06 | 2009-03-26 | Sumitomo Chemical Co Ltd | Polarizing film, polarizing plate and those manufacturing method |
WO2010071093A1 (en) * | 2008-12-18 | 2010-06-24 | 株式会社クラレ | Method for producing polarizing film |
CN102029710B (en) * | 2009-10-06 | 2015-04-01 | 富士胶片株式会社 | Method for manufacturing optical film, optical film, liquid crystal display device and image display device |
JP2011111526A (en) * | 2009-11-26 | 2011-06-09 | Kuraray Co Ltd | Polyvinyl alcohol-based polymer film |
JP5562084B2 (en) * | 2010-03-24 | 2014-07-30 | 日東電工株式会社 | Optical film manufacturing method and manufacturing apparatus thereof |
JP4902801B2 (en) * | 2010-06-22 | 2012-03-21 | 住友化学株式会社 | Manufacturing method of polarizing film |
CN103149620B (en) * | 2011-12-06 | 2017-04-12 | 日东电工株式会社 | Process for producing polarizing element and process for producing polarizing plate |
JP6462199B2 (en) * | 2012-12-04 | 2019-01-30 | 住友化学株式会社 | Manufacturing method of polarizing film and polarizing plate |
-
2015
- 2015-07-27 WO PCT/JP2015/071223 patent/WO2016021432A1/en active Application Filing
- 2015-07-27 KR KR1020177003283A patent/KR101990222B1/en active IP Right Grant
- 2015-07-27 JP JP2016540157A patent/JP6294491B2/en active Active
- 2015-07-27 CN CN201580040056.2A patent/CN106575008B/en active Active
- 2015-08-04 TW TW104125202A patent/TWI654225B/en active
-
2017
- 2017-07-05 JP JP2017131743A patent/JP2017211657A/en active Pending
- 2017-12-22 JP JP2017245896A patent/JP2018063443A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001315140A (en) * | 2000-05-09 | 2001-11-13 | Kuraray Co Ltd | Polyvinyl alcohol polymer film, method for manufacturing the same, and polarizing film |
JP2002030162A (en) * | 2000-07-17 | 2002-01-31 | Kuraray Co Ltd | Polyvinyl alcohol film and polarizing film |
JP2004020635A (en) * | 2002-06-12 | 2004-01-22 | Kuraray Co Ltd | Manufacturing method of polyvinyl alcohol film for optical use |
WO2014084154A1 (en) * | 2012-11-30 | 2014-06-05 | 株式会社クラレ | Multilayer film |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019035956A (en) * | 2017-08-16 | 2019-03-07 | 住友化学株式会社 | Polarizing film manufacturing method and manufacturing system |
JP7217599B2 (en) | 2017-08-16 | 2023-02-03 | 住友化学株式会社 | Manufacturing method and manufacturing system for polarizing film |
JP2022022085A (en) * | 2020-07-22 | 2022-02-03 | 住友化学株式会社 | Method for manufacturing polarization film and polyvinyl alcohol film |
JP7061712B2 (en) | 2020-07-22 | 2022-04-28 | 住友化学株式会社 | Method for manufacturing polarizing film and polyvinyl alcohol-based film |
Also Published As
Publication number | Publication date |
---|---|
CN106575008A (en) | 2017-04-19 |
JP2018063443A (en) | 2018-04-19 |
TWI654225B (en) | 2019-03-21 |
KR20170040241A (en) | 2017-04-12 |
TW201613990A (en) | 2016-04-16 |
JPWO2016021432A1 (en) | 2017-06-01 |
JP6294491B2 (en) | 2018-03-14 |
CN106575008B (en) | 2019-12-24 |
JP2017211657A (en) | 2017-11-30 |
KR101990222B1 (en) | 2019-06-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR102189762B1 (en) | Process for manufacturing polarizing film | |
TWI524098B (en) | Method for producing polarizing film | |
WO2016009856A1 (en) | Polyvinyl alcohol-based polarizing film, polarizing plate, and method for manufacturing same | |
JP2013148806A (en) | Polarizing film and manufacturing method thereof and polarizer | |
WO2017002719A1 (en) | Method for producing polarizing film | |
WO2015076237A1 (en) | Method for manufacturing polarizing film | |
TWI671181B (en) | Method for manufacturing polarizing film | |
JP2018063443A (en) | Production method of polarizing film | |
JP6067158B1 (en) | Manufacturing method of polarizing film | |
JP7012891B2 (en) | Method for manufacturing polarizing film | |
KR102512665B1 (en) | Process for producing polarizing film and apparatus for producing polarizing film | |
JP2020129152A (en) | Production method for polarizing film | |
JP2022136808A (en) | Method of manufacturing polarizing film | |
TW202331314A (en) | Method of manufacturing polarizer |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 15829638 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2016540157 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 20177003283 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 15829638 Country of ref document: EP Kind code of ref document: A1 |