CN105738978A - Optical film and solution film-forming method - Google Patents

Abstract

The invention provides an optical film which serves as a protection film for a polarizing film and increases brightness, and a solution film-forming method which can produce the optical film in a bar shape. The method comprises the following steps: continuously conducting flow casting on a first adhesive cement and a second adhesive cement on an advancing belt so as to form a flow casting film, performing peeling from the belt to form a wet film; on a second layer formed, of the wet film, by the second adhesive cement, using a shape imparting roller to form a recessed part and a protruding part; guiding the wet film to a heating chamber, performing delivering at least 15 minutes for heating treatment; obtaining the optical film through the heating. The obtained optical film is provided with a cellulose compound acyl object layer (21) and a curing layer (22). The curing layer (22) has a higher refraction than the cellulose compound acyl object layer (21) and has a plurality of prisms (22a) arranged on an interface with the cellulose compound acyl object layer. A prismatic lens (16) is obtained by the optical film.

Description

Blooming and solution film-forming method

Technical field

The present invention relates to blooming and manufacture the solution film-forming method of blooming.

Background technology

In recent years, liquid crystal indicator (LCD, liquidcrystaldisplay) is popularized.This liquid crystal indicator has low power consumption, the feature such as slim, is utilized the various machines of the display from heavy-duty machines as domestic TV to notebook computer or the small machines such as digital camera, mobile phone.In such liquid crystal indicator, popularized in the backlight mode of backlighted liquid crystal panel.

The general structure of the liquid crystal indicator of backlight mode possesses the liquid crystal panel making the absorbance of light change according to the signal of telecommunication and irradiates the light source cell (backlight) of light from it behind.A pair polaroid that liquid crystal panel is configured by crossed Nicol makes the liquid crystal cells of the polarization state change of the light of transmission constitute between which with clamping.Additionally, light source cell by light sources such as fluorescent tube, LED (LightEmittingDiode) and makes to be illuminated equably in the whole face of liquid crystal panel to constitute from the light generation scattering of light source the diffusion sheet spread or the brightness enhancement sheet etc. being referred to as so-called BEF (BrightnessEnhancementFilm) that is used for making front face brightness improve.So, liquid crystal indicator is made up of multiple parts, and in order to make the further slimming of liquid crystal indicator, by making, all parts is thinner tackles.Such as, the cellulose acylate film mostly used as the protecting film of polaroid is also more and more thinner in recent years.

As described brightness enhancement sheet, use prismatic lens more.This prismatic lens makes the light from the oblique injection of light source be partial to the normal direction of liquid crystal panel.As the prismatic lens being formed with multiple prisms that cross section is triangle on one face at certain intervals, can be categorized as: make to be formed prism face (hereinafter referred to as prism facets) towards the refractive prismatic lens (so-called upwards prismatic lens) configured towards liquid crystal panel side (side contrary with light source) and make prism facets towards the fully-reflected type prismatic lens (so-called downward prismatic lens) of light source side.Upwards prismatic lens is when the light incident from the face of the side contrary with prism facets penetrates from the inclined-plane of prism, makes the normal direction of this light alignment liquid crystal panel reflect.Alternative downward prismatic lens makes to enter into the light from light source within prism from prism an inclined-plane incidence and occurs total reflection to penetrate on another inclined-plane to the normal direction of liquid crystal panel.

Additionally, such as Japanese Unexamined Patent Publication 2009-157029 publication is recorded, it is known to make prism be formed at the blooming of inside.In addition, as being internally formed the optical element of figure, such as Japanese Unexamined Patent Publication 2005-173057 publication is recorded, have on glass by two kinds of laminated resins of ultraviolet curing, the optical element being formed with the figure of diffraction grating on the interface of two kinds of resins.

In addition, as the manufacture method at the blooming being internally formed prism, such as Japanese Unexamined Patent Publication 2009-157029 publication is recorded, propose following method: ionizing radiation is solidified resin be expressed to the surface being formed with prism and transfer after, ionizing radiation is made to solidify resin solidification by irradiating ionizing radiation, thus forming optical element.As the manufacture method at the optical element being internally formed figure, such as Japanese Unexamined Patent Publication 2005-173057 publication is recorded, propose following method: by clamping the first ultraviolet curing resin between glass plate and the mould being formed with figure of a part for composition optical element thus giving figure to this resin, the picture surface at this first ultraviolet curing resin places the second ultraviolet curing resin and pressurization forms optical element.

But, even if making all parts thinning, the slimming of liquid crystal indicator is also limited.Additionally, make described cellulose acylate film further thinning time, make polaroid time there is the problem that operability (treatability) is deteriorated.Additionally, when making prismatic lens thinning, the bending of prismatic lens becomes big, comes into question when making polaroid.Therefore, it is desirable to reduce the component count of liquid crystal indicator by making the brightness that cellulose acylate film has prismatic lens in the lump improve function and contribute to slimming.

According to the manufacture method recorded in Japanese Unexamined Patent Publication 2009-157029 publication, ionizing radiation solidifies the recess that resin cannot be introduced into the figure of prism sometimes, can form small space, and the method does not claim to be reliable manufacture method.Similarly, according to the manufacture method recorded in Japanese Unexamined Patent Publication 2005-173057 publication, second ultraviolet curing resin cannot be introduced into the recess of the figure of the first ultraviolet curing resin sometimes, can form small space, and the method does not claim to be reliable manufacture method.The manufacture method recorded in Japanese Unexamined Patent Publication 2005-173057 publication is due also to be difficult to be continuously manufactured by, thus the blooming of the strip of material as such as prismatic lens cannot be manufactured.

Summary of the invention

It is an object of the invention to provide the function with the protecting film as polaroid and brightness carries H.D blooming and can manufacture the solution film-forming method of this blooming with strip.

The blooming of the present invention possesses cellulose acylate layers and cured layer.Cellulose acylate layers has the one side of the face becoming blooming, containing cellulose acylate.Cured layer has the one side of another face becoming blooming, transparent heat reactive resin formed on the another side of cellulose acylate layers, higher than the refractive index of cellulose acylate layers, with the interface of cellulose acylate layers on there is multiple prism.

Preferred cellulose acylate is Triafol T.The refractive index of preferred heat reactive resin is the scope of more than 1.50 and less than 2.20.

Preferred heat reactive resin is the resin that the heat cure of the heat-curable compounds by having the polymerizable group containing ethylenic unsaturated bond generates.Preferred heat-curable compounds has at least 2 above-mentioned polymerizable groups in 1 molecule.

Preferred blooming is arranged on the polarizing coating of the light source side of the liquid crystal indicator with liquid crystal cells and 2 polarizing coatings, arranges with the state closely sealed with the light source side of this polarizing coating.

The solution film-forming method of the present invention includes following the first operation, the second operation, the 3rd operation and the 4th operation, manufactures the blooming with multiple prism.First operation, by being continuously cast the first rubber cement and the second rubber cement on the curtain coating supporter advanced, forms the ground floor formed by the first rubber cement and casting films that the second layer formed by the second rubber cement is laminated；Described first rubber cement contains cellulose acylate and the first solvent, and described second rubber cement contains cellulose acylate, for being generated heat-curable compounds and second solvent of the high transparent heat reactive resin of refractive index ratio cellulose acylate by heat cure.Second operation is by forming wet film by casting films so that remaining has the state of the first solvent and the second solvent to peel off from curtain coating supporter.3rd operation utilize along the circumferential direction be alternatively formed on the circumferential surface on the width of casting films extend cross section be triangle multiple recesses and protuberance shape give roller, from second layer side, casting films in transit or wet film are extruded, thus being continuously formed multiple prism on the second layer.4th operation is by transporting at least 15 minutes relative to the casting films that solid constituent is less than 300% or wet film limit heating edge through the 3rd operation, residual solvent amount, make heat-curable compounds ooze out on multiple prisms, casting films or wet film are dried and makes heat-curable compounds solidify.

Preferably casting films or wet film are heated and maintained at the temperature in the scope of more than 140 DEG C and less than 200 DEG C by the 4th operation.

Preferably the 4th operation by transporting thus casting films or wet film are heated in the atmosphere have adjusted temperature.

The refractive index of preferred heat reactive resin is the scope of more than 1.50 and less than 2.20.The molecular weight of preferred heat-curable compounds is in the scope of more than 250 and less than 2000.Preferred heat-curable compounds has the polymerizable group containing ethylenic unsaturated bond, more preferably in having at least 2 these polymerizable groups in 1 molecule.

The blooming of the present invention, except having as the function of the protecting film of polaroid, also has the function improving brightness.Additionally, the solution film-forming method according to the present invention, it is possible to manufacture the function in the lump with the protecting film as polaroid and brightness carries H.D blooming using strip.

Accompanying drawing explanation

By referring to accompanying drawing, reading the detailed description of preferred embodiment, those skilled in the art can easily understand that above-mentioned purpose, advantage.

Fig. 1 is the explanation figure of an example of the composition representing the liquid crystal indicator using the prismatic lens implementing the present invention.

Fig. 2 is the axonometric chart of the outward appearance representing prismatic lens.

Fig. 3 is the sectional view of prismatic lens.

Fig. 4 is the explanation figure of the outline representing the solution film-forming equipment implementing the present invention.

Fig. 5 is the explanation figure of the structure representing that shape gives device.

Fig. 6 is the sectional view that shape gives the side face of roller.

Fig. 7 is the explanation figure of wet film and blooming.

Fig. 8 is the explanation figure of the outline representing solution film-forming equipment.

Symbol description

10 liquid crystal indicators

13 liquid crystal cells

15a polarizing coating

16 prismatic lenses

21 cellulose acylate layers

22 cured layers

22a prism

30 solution film-forming equipment

31,32 first, second rubber cement

33 bloomings

35 shapes give device

40 add hot cell

43 wet films

50 casting films

Detailed description of the invention

In Fig. 1, liquid crystal indicator 10 possesses liquid crystal panel 11 and light source cell 12.Liquid crystal panel 11 is made up of liquid crystal cells 13 and 2 polaroids 14,15.Liquid crystal cells 13 is encapsulated liquid crystals between transparent glass substrate, by applying voltage on the inner surface of each glass substrate between the transparency electrode of formation, makes the polarization state change of the light passed through.Polaroid 14 and polaroid 15 configure with the state being in crossed Nicol, configure liquid crystal cells 13 between this polaroid 14 and polaroid 15.Thus, make the polarization state passing through the illumination light of the rectilinearly polarized light of polaroid 15 change according to each pixel by liquid crystal cells 13, regulate the light quantity through polaroid 14 and show image.

Polaroid 14 is made up of polarizing coating 14a and a pair protecting film 14b, the 14c pasted on its two sides.Polaroid 15 is made up of polarizing coating 15a, protecting film 15b and prismatic lens 16.Protecting film 15b is pasted onto on the face of liquid crystal cells 13 side of polarizing coating 15a.Prismatic lens 16 is to be cut into lamellar from the blooming 33 (with reference to Fig. 4) using solution film-forming method described later to manufacture and obtain, and is made up of cellulose acylate layers 21 and cured layer 22.This prismatic lens 16 is pasted onto on the face of light source cell 12 side of polarizing coating 15a, as the protecting film of polarizing coating 15a with for improving fully-reflected type prismatic lens (upwards prismatic lens) function of brightness.It addition, the accompanying drawing that the detailed content of prismatic lens 16 uses other is described below.

Light source cell 12 is the unit illuminated by liquid crystal panel 11 from behind, is the unit of the edge-lit being made up of illuminator 17, light guide plate 18, reflectance coating 19.Illuminator 17 uses such as bar-shaped fluorescent tube or linearly aligned multiple LED (lightemittingdiode, light emitting diode), to configure in the way of the end (edge) of the light guide plate 18 of wedge shape.The illumination light radiated from this illuminator 17 directly or is reflected by reflecting plate 17a and incides inside from the end of light guide plate 18.Light guide plate 18 makes the illumination light of incidence penetrate to the tilted direction relative to the normal of liquid crystal panel 11 with inclination angle from the outgoing plane 18a in the same size with liquid crystal panel 11 by reflecting therein.Reflectance coating 19 makes the illumination light that the face with liquid crystal panel 11 opposition side from light guide plate 18 is penetrated reflect and return light guide plate 18.

As in figure 2 it is shown, the integrative-structure that prismatic lens 16 is cellulose acylate layers 21 and cured layer 22 is laminated.Cellulose acylate layers 21 is formed by cellulose acylate, except cellulose acylate, it is also possible to containing additives such as anti-deterioration agent, UV absorbent (UV agent).In this embodiment, as cellulose acylate, use TAC (tri acetyl cellulose, Triafol T).However, it is possible to think that other cellulose acylate substitutes TAC.Namely, it is also possible to the acyl group for other substitutes acetyl group.In cellulose acylate, when the substitution value at the cellulosic hydroxyl of acyl substituted meets following formula (I)～(III), the present invention is effective especially.In formula (I)～(III), A and B represents the acyl group substitution value relative to the hydrogen atom in cellulosic hydroxyl, and A is the substitution value of acetyl group, and B is carbon number is the substitution value of the acyl group of 3～22.It addition, total acyl substitution Z of cellulose acylate is by the A+B value obtained.

(I)2.7≤A+B≤3.0

(II)0≤A≤3.0

(III)0≤B≤2.9

Additionally, the substitution value of the cellulosic hydroxyl of use acyl substituted meets the DAC (diacetyl cellulose, cellulose diacetate) of following formula (IV) when substituting TAC or use together with TAC, the present invention is effective especially.

(IV) 2.0≤A+B < 2.7

From the view point of postpone the wavelength dispersibility of (retardation); while meeting formula (IV), the total B of the substitution value of the substitution value A of the acetyl group of DAC and acyl group that carbon number is more than 3 and less than 22 meets following formula V and (VI).

(V) 1.0 < A < 2.7

(VI) 0≤B < 1.5

The glucose unit constituting cellulosic β-1,4 bonding has free hydroxyl on 2,3 and 6.Cellulose acylate is part or all of polymer being esterified by the acyl group that carbon number is more than 2 of their hydroxyl.Acyl substitution refers to each position for 2,3 and 6, and the ratio (during 100% esterification, substitution value is 1) of esterification occurs cellulosic hydroxyl.

For the detailed content of cellulose acylate, being documented in [0140] section of Japanese Unexamined Patent Publication 2005-104148 publication to [0195] section, these records are readily adaptable for use in the present invention.In addition, for solvent and plasticizer, anti-deterioration agent, UV absorbent (UV agent), optical anisotropy controlling agent, postpone the additives such as controlling agent, dyestuff, delustering agent, remover, stripping accelerator, being documented in [0196] section of Japanese Unexamined Patent Publication 2005-104148 publication similarly in detail to [0516] section, these records are readily adaptable for use in the present invention.

Cured layer 22 is formed by transparent heat reactive resin (heat curing copolymer).Heat reactive resin be by heat heat-curable compounds make it solidify the resin generated, for heat-curable compounds detailed content as be described hereinafter.If the refractive index of cellulose acylate layers 21 is N21, if the refractive index of cured layer 22 is N22, refractive index N22 specific refractivity N21 is high.Thus, reflect when illumination light injects to cellulose acylate layers 21 from cured layer 22.The refractivity preferably obtained by N22-N21 is more than 0.20, more preferably more than 0.30, more preferably more than 0.50.The refractive index of preferred heat reactive resin is in the scope of more than 1.50 and less than 2.20, more preferably in the scope of more than 1.50 and less than 1.80, more preferably in the scope of more than 1.50 and less than 1.60.It addition, in main cellulose acylate, the refractive index of TAC is the refractive index of 1.48, DAC is 1.48.

The one side of cellulose acylate layers 21 is a sheet surface of prismatic lens 16, and the one side of cured layer 22 is another sheet surface of prismatic lens 16, and arbitrary surface is all formed as smooth tabular surface.These sheet surfaces are smoothly formed, about smooth degree (hereinafter referred to as smoothness), in the scope that the Japanese Industrial Standards JISB0601-2013 arithmetic mean roughness Ra being benchmark is more than 1 μm and less than 10 μm.Prismatic lens 16 makes the tabular surface of cellulose acylate layers 21 side and polarizing coating 15a snugly attach with the tabular surface of cured layer 22 side towards the posture of light source cell 12 side.

The interface of cellulose acylate layers 21 and cured layer 22 is the concavo-convex planar repeatedly in one direction of triangle, cured layer 22 with the interface of cellulose acylate layers 21 on there is multiple prism 22a.The cross section of each prism 22a is the prismatic of triangle, and each prism 22a is arranged on the direction vertical with the bearing of trend of each prism 22a.

Prismatic lens 16 makes the illumination light from light guide plate 18 (with reference to Fig. 1) incident from the tabular surface of cured layer 22 side.This prismatic lens 16 controls the distribution of illumination light in the way of making the light quantity increase of the illumination light penetrated to the normal direction of liquid crystal panel 11.That is, prismatic lens 16 makes it be partial in the way of making to become the normal direction of liquid crystal panel 11 from light guide plate 18 towards the illumination light that tilted direction penetrates.Specifically, when the illumination light penetrated from light guide plate 18 towards tilted direction is advanced in the inside of cured layer 22 and penetrates from the inclined-plane of prism 22a, the difference refraction of the cured layer 22 refractive index with cellulose acylate layers 21 is utilized to be partial to normal direction.The size of prismatic lens 16 is roughly the same with the back side of liquid crystal panel 11.

In Fig. 3, the thickness T16 of prismatic lens 16 is in the scope of more than 100 μm and less than 200 μm.In the scope that drift angle (hereinafter referred to as prism vertex angle) θ 1 is more than 40 ° and less than 130 ° of prism 22a, in the scope that subtended angle θ 2 is more than 40 ° and less than 130 ° of bottom.Prism 22a is in the scope of more than 10 μm and less than 60 μm from height (high hereinafter referred to as the prism) H22a at bottom to top.As in the top of prism 22a and the distance at top and scope that interval (hereinafter referred to as prism intervals) P22a is more than 30 μm and less than 100 μm.

Solution film-forming equipment 30 shown in Fig. 4 is manufactured described blooming 33 by the first rubber cement 31 and the second rubber cement 32.First rubber cement 31 is for make TAC be dissolved in the first solvent, and the second rubber cement 32 is make TAC and the heat-curable compounds for forming cured layer 22 be dissolved in the second solvent.First rubber cement 31 and the second rubber cement 32 can also contain above-mentioned various additives except TAC.Additionally, the first rubber cement 31 can also use other cellulose acylate above-mentioned to substitute TAC or to use together with TAC with the second rubber cement 32.From the view point of make the refractive index within cellulose acylate layers 21 same, the first rubber cement 31 is preferably mutually identical material with the cellulose acylate of the second rubber cement 32.

First solvent and the second solvent use the mixture that dichloromethane, methanol and n-butyl alcohol mix with the mass ratio of 800:135:65 in the present embodiment.First solvent and the second solvent are not limited to this, as long as the material of cellulose acylate that solubilized uses, it is possible to for one matter, it is also possible to for mixture.As the material that can be used as solvent composition, for instance ethanol, methyl acetate, N-Methyl pyrrolidone etc. can be enumerated.When first solvent and the second solvent are one matter, from the view point of suppress being separated in cellulose acylate layers more effectively, it is preferred to use identical material.From when at least any one is mixture of same viewpoint, the first solvent and the second solvent, it is preferable that the first solvent and the second solvent have common composition.When first solvent and the second solvent are the mixture formed by multiple common component, from the same viewpoint, more preferably the mixing ratio of composition is identical each other.

Heat-curable compounds can be monomer, it is also possible to for the oligomer such as dimer, trimer.The molecular weight of heat-curable compounds is preferably more than 250 and less than 2000, more preferably more than 500 and less than 2000, more preferably in the scope of more than 1000 and less than 2000.The above-mentioned molecular weight of heat-curable compounds is weight average molecular weight, is tried to achieve by polystyrene conversion by gel permeation chromatography (GPC).

Preferred heat-curable compounds has the polymerizable group containing ethylenic unsaturated bond.Example as this polymerizable group, for instance acryloxy, methacryloxy, acryloyl group, methylacryloyl can be enumerated.

More preferably heat-curable compounds is multi-functional (methyl) the acrylate based compound in 1 molecule with at least 2 polymerizable groups containing ethylenic unsaturated bond.As an example, ethylene glycol bisthioglycolate (methyl) acrylate, bisphenol-A tetraethoxy two (methyl) acrylate, bisphenol-A four propoxyl group two (methyl) acrylate, 1,6-hexanediol two (methyl) acrylate, neopentyl glycol two (methyl) acrylate etc. can be enumerated.It addition, the polymerizable group of present embodiment is acryloxy.

Solution film-forming equipment 30 possesses casting device 34, shape gives device the 35, first device for excising 37, adds hot cell the 40, second device for excising 41, devices for taking-up 42.

Casting device 34 is formed the wet film 43 of the state containing solvent by the first rubber cement 31 and the second rubber cement 32.This casting device 34 possesses band 46, supports roller 47, casting head 48 etc. a pair.It is the curtain coating supporter not having end being formed as ring-type with 46, is erected on a pair support roller 47, support and substantially become level between roller 47.Each its driving axle of roller 47 that supports is connected with motor 47a, is rotated with identical speed along the circumferencial direction shown in arrow A by these motors 47a.Supporting the rotation of roller 47 by these, band 46 circulation is advanced.

Casting head 48 by the first rubber cement 31 and the second rubber cement 32 in traveling with 46 successively spray.Thus second with 46 successively form the casting films 50 of the state of superposition the first rubber cement 31 on the second rubber cement 32.Pressure-reducing chamber 49 makes the rear side (upstream side of the direct of travel with 46) that ejiction opening (not shown) from casting head 48 arrives first rubber cement 31 of period on surface of band 46 and the part of the second rubber cement 32 reduce pressure, it is prevented that this partial vibration or break.

Heat transfer medium after adjustment temperature is supplied in each support roller 47 by tempering machine 51.Thus, each roller 47 that supports is via the temperature controlling casting films 50 with 46.In this embodiment, tempering machine 51 is by dry curtain coating, namely only by dry and control temperature in the way of making casting films gelation, promoting the solvent evaporation of casting films 50.Dry and can only blow, it is also possible to except air-supply, be also heated.By heating, it is possible to make gelation rapider.

Along utilizing with the 46 transport paths transporting casting films 50, configuration pressure fan 52 and back heater 53, they adjust the rate of drying of casting films 50.Casting device 34 possesses both pressure fan 52 and back heater 53, it is also possible to for possessing the mode of any one.Curtain coating face 46a (with reference to Fig. 5) of pressure fan 52 and the band 46 that the first rubber cement 31 and the second rubber cement 32 curtain coating are formed casting films 50 is opposed to configuration, is adjusted to the dry gas (air such as dried) of set point of temperature near casting films 50 from each nozzle 52a outflow.In present embodiment, the direct of travel with 46 is provided with 2 pressure fan 52, but the number of pressure fan 52 is not particularly limited, it is possible to be 1 or more than 3.The face of back heater 53 and the opposition side with the curtain coating face 46a of 46 is opposed to configuration, via band 46 heating casting films 50.In present embodiment, it is provided with a back heater 53, but the number of back heater 53 is not particularly limited, it is possible to be 1 or more than 3.

Additionally, casting device 34 is further equipped with stripper roll 56 (with reference to Fig. 5) and chamber 57.Band 46, casting head 48, pressure-reducing chamber 49 etc. are incorporated in chamber 57.It is configured with in chamber 57 and makes to be formed as, from first rubber cement the 31, second rubber cement 32, casting films 50, wet film 43 evaporation, the condenser that the solvent of gas condenses respectively.The solvent liquefied by this condenser is sent to retracting device and reclaims.It addition, eliminate the diagram of condenser and retracting device.

Casting films 50 is dried with in the transport of 46 preferably in utilizing, although to contain solvent but the gel state lost flowability from being with 46 peel off and be transported to downstream.Shape imparting device 35 it is being configured with near position from peeling off of 46 stripping casting films 50.

The shape of present embodiment gives device 35 to be had casting films 50 from 46 functions peeled off and the function forming recess 44a and protuberance 44b ((B) with reference to Fig. 7) with the state containing solvent the casting films 50 peeled off by this function, i.e. wet film 43.The ground floor 43a (with reference to Fig. 7) of wet film 43 is by the layer of the first rubber cement 31 formation, the second layer 43b (with reference to Fig. 7) layer for being formed by the second rubber cement 32.It addition, in present embodiment, shape is given device 35 be arranged on by with 46, the inside of chamber 57 that surrounds of casting head 48, pressure-reducing chamber 49 etc., it is also possible to be arranged on that chamber 57 is outer, be namely arranged between casting device 34 and the first device for excising 37.The detailed content of shape imparting device 35 is as be described hereinafter.

The wet film 43 giving device 35 from shape is transported in the first device for excising 37.First device for excising 37 is the device for being excised from wet film 43 by sidepiece.First device for excising 37 has the top cutter as cutting blade and bottom knife, and what these cutting blades were arranged in each sidepiece of wet film 43 passes through position.The sidepiece delivering to the wet film 43 of the first device for excising 37 forms the shape of such as wave sample sometimes, by this sidepiece utilizes the first device for excising 37 excise, makes wet film 43 utilize the transport of the aftermentioned roller 63 adding hot cell 40 to become stable.Wet film 43 after utilizing the first device for excising 37 to excise sidepiece is transported to and adds in hot cell 40.

Add hot cell 40 by thermoregulator 64 by internal regulation to the temperature range specified.The inside adding hot cell 40, by such as adding in hot cell 40 adding in hot cell 40 to be imported by the air after regulating temperature while aerofluxus, is maintained the temperature of regulation by thermoregulator 64.Add in hot cell 40, be configured with the multiple rollers 63 hanging wet film 43 in inside, by wet film 43 adding transport in the hot cell 40 in.Wet film 43 from the atmosphere transported around path by said temperature actuator 64 warmed-up add hot cell 40 by period heated and form blooming 33.

By adding the heating in hot cell 40, promote solvent evaporation to make wet film 43 dry, concurrently form cured layer 22 (with reference to Fig. 1～Fig. 3 reference).As be described hereinafter, the heat-curable compounds contained by second layer 43b is made to ooze out by heating on the surface utilizing shape to give the second layer 43b (with reference to Fig. 7) that device 35 imparts recess 44a and protuberance 44b, make it solidify by heating further, be consequently formed cured layer 22.It addition, the surface of the heat-curable compounds in the liquid oozed out, carry out the period solidified at heat-curable compounds, carry out levelling (smoothing).Shipping time under heating can regulate the method for the method of the length transporting path of the wet film 43 added in hot cell 40 or the travelling speed of adjustment wet film 43 and be adjusted by suitably increasing and decreasing the number of roller 63.

Carry out relative to the wet film that residual solvent amount is less than 300% 43 of solid constituent contained in wet film 43 by adding the heating in hot cell 40.Thus, utilize from add within hot cell 40 by and when wet film 43 is heated, it is possible to be channeled to add in hot cell 40 after less than 300% by the residual solvent quantitative change relative to solid constituent of wet film 43.This residual solvent amount is heating when starting, the value that is supplied in the wet film 43 added in hot cell 40.By by residual solvent amount is less than 300%, wet film 43 limit heating edge is transported at least 15 minutes, it is possible to carry out the dry of the oozing out of described heat-curable compounds, levelling, solidification and wet film 43 effectively.It addition, the residual solvent amount being supplied to the wet film 43 of heating is more preferably less than 100%, more preferably less than 50%.

Solid constituent in present embodiment is the TAC and the heat-curable compounds that are used as cellulose acylate, and when using described various additive, these additives are also contained in solid constituent.It addition, heat-curable compounds changes because of solidification due to quality, so the quality of heat-curable compounds is after solidifying, namely as the value of heat reactive resin.Additionally, above-mentioned residual solvent amount be with wait obtain the quality of wet film 43 measuring object of residual solvent amount be X, be completely dried with this wet film 43 after quality for Y time, with { the value (unit is for %) of the so-called dry basis that (X-Y)/Y} × 100% is obtained." it is completely dried " residual quantity being not required for solvent strictly for " 0 ".In present embodiment, for measuring the wet film 43 of object, with more than 120 DEG C, relative humidity is for carrying out the quality after the dried of more than 3 hours in the temperature chamber of less than 10% for Y.

In this example, by utilizing the temperature adding the aerofluxus in hot cell 40 and the atmosphere regulated around transport path of supplying gas to adjust the temperature of wet film 43, but the method for regulating temperature of wet film 43 is not limited to this.As other example of the method for regulating temperature of wet film 43, there is the radiation heating by IR (Infrared, infrared ray) heater, by the conduction heating of roller homoiothermic.Refer to that the roller of temperature by making have adjusted periphery contacts with wet film 43 by the conduction heating of roller homoiothermic to heat wet film 43 and adjust temperature.But, as in this embodiment, by regulating the atmosphere temperature transported around path and the method adjusting the temperature of wet film 43, from the view point of carry out the dry of the oozing out of heat-curable compounds, levelling, solidification and wet film 43 effectively, it is preferred.It addition, wet film 43 is due to relatively thin, the temperature-responsive for transporting the atmosphere around path is good, utilizes the temperature of the detection wet films 43 such as temperature detector hence without necessity, it is possible to the temperature added in hot cell 40 is considered as the temperature of wet film 43.

It is heated in the way of making the temperature of wet film 43 be maintained in certain scope preferably in adding in hot cell 40.The scope of this temperature can set according to the solidification temperature of heat-curable compounds, more preferably in the scope of more than 140 DEG C and less than 200 DEG C.It addition, it is not necessary to the steady state value remained within the scope of this, can also change within the scope of this in transport.By making the temperature of wet film 43 be more than 140 DEG C, compared with during less than 140 DEG C, can promote that the above-mentioned of heat-curable compounds is oozed out.Additionally, by being less than 200 DEG C, compared with during higher than 200 DEG C, the modified of wet film 43 can be suppressed more effectively.The transport of wet film 43 can be maintained more effectively.The softening being modified as such as wet film 43 of wet film 43 or pyrocondensation etc..By heating the temperature that wet film 43 keeps, more preferably in the scope of more than 140 DEG C and less than 200 DEG C, more preferably more than 180 DEG C and less than 200 DEG C.

Second device for excising 41 becomes the width of regulation for being cut continuously the both sides of blooming 33.Second device for excising is formed as the structure identical with the first device for excising 37.Devices for taking-up 42 is the device coiling into web-like for being formed into the blooming 33 of Rack, is provided with the core 65 for winding blooming 33.

Known stenter (not shown) can be possessed between device 35 and the first device for excising 37 it addition, give in shape.Stenter, while transporting wet film 43 with the state of the width that controls wet film 43, carries out drying of wet film 43.Stenter is made up of such as multiple clips, air supply unit, air outflow portion etc..Each clip clamps the sidepiece of wet film 43 respectively.Multiple clips are arranged on the chain of ring-type at a prescribed interval, and chain is arranged with the track along the both sides configuration transporting path at wet film 43 with moving freely, and its moving direction is limited by track.Thus, each clip moves along track.The track of side and the track of opposite side are respectively configured as linearity, have the situation of spaced fixing situation, the situation of change, both combinations.The dry gas being adjusted to various temperature is supplied to air outflow portion by air supply unit, is blown out to the wet film 43 in stenter from air outflow portion by dry gas.It addition, for keeping the holding member of wet film 43 to be not limited to clip, it is also possible to for running through, at the sidepiece of wet film 43, the needle plate that multiple pin carries out keeping.When making wet film 43 break because of the maintenance of clip because the residual solvent amount of wet film 43 very more, it is possible to use needle plate.It addition, when so arranging stenter, the maintenance vestige formed by the holding member of stenter is excised by the first device for excising 37 from wet film 43.

As it is shown in figure 5, shape gives device 35 possesses described stripper roll 56 and shape imparting roller 68.Stripper roll 56 configures abreast with its rotating shaft and the rotating shaft supporting roller 47.Stripper roll 56 is arranged in the side contrary with 46 relative to the path of transporting of wet film 43 in this example embodiment, makes wet film 43 be wrapping with on the circumferential surface.Stripper roll 56 carries out driven rotation along with the transport of wet film 43.By when wet film 43 is wound around in stripper roll 56 to the downstream traction wet film 43 of solution film-forming equipment 30, thus make casting films 50 at the stripping position PP of regulation from band 46 stripping.Alternatively, it is also possible to made the transport synchronous rotary of stripper roll 56 and wet film 43 by motor.

Shape gives roller 68 and is opposed to configuration with stripper roll 56, cooperates with stripper roll 56 and is alternatively formed recess 44a and protuberance 44b on the second layer 43b (with reference to Fig. 7) formed by the second rubber cement 32 of wet film 43 along carriage direction Z1.That is, stripper roll 56 is as being used for casting films 50 is peeled off the peeling member function forming wet film 43, simultaneously as being used for wet film 43 is formed the shape member of imparting function of prism 22a.

In order to form recess 44a and protuberance 44b on wet film 43, shape gives and is respectively formed with, on the periphery of roller 68, recess 68a, the protuberance 68b that multiple cross section is triangle.The width that recess 68a, protuberance 68b give the direction of principal axis of roller 68, i.e. wet film 43 along shape extends, and the circumferencial direction giving roller 68 along shape is alternatively formed.This shape is given roller 68 and is rotated by motor 69 with the state clamping wet film 43 between stripper roll 56.It is transport the direction (for counterclockwise in figure) of wet film 43 that shape gives the direction of rotation of roller 68.This shape gives roller 68 and from second layer 43b (with reference to Fig. 7) side formed by the second rubber cement 32, wet film 43 in transit is extruded in stripper roll 56, second layer 43b transfers the shape of recess 68a and protuberance 68b, forms recess 44a and protuberance 44b.

In Fig. 6, shape gives the recess 68a of roller 68, the shape of protuberance 68b is determined according to the recess 44a formed and protuberance 44b.It addition, the shape of the recess 44a formed and protuberance 44b is determined according to prism 22a.Identical as the interval between interval P68a and prism intervals P22a and the summit of adjacent protuberance 44b of the distance between protuberance 68b adjacent in a circumferential direction and each summit of protuberance 68b, it is less than 100 μm.

Drift angle (hereinafter referred to as the roller drift angle) θ 3 of preferred protuberance 68b is less than prism vertex angle θ 1, and the subtended angle θ 4 of recess 68a is less than above-mentioned subtended angle θ 2.Further, it is preferable that height (degree of depth of the recess 68a) H68a of protuberance 68b is bigger than the high H22a of above-mentioned prism.This is because, by solvent and evaporates from wet film 43, the degree of depth of the recess 44a formed by protuberance 68b, the protuberance 44b formed by recess 68a height reduce respectively, form the subtended angle of the recess 44a of prism vertex angle θ 1, form the reason that the drift angle of the protuberance 44b of subtended angle θ 2 increases respectively.

As it is shown in figure 5, as in the present embodiment, it is preferable that shape gives and is provided with pressure regulator 70 on roller 68.This pressure regulator 70 adjusts shape and gives the roller 68 extruding force to wet film 43 when transferring the shape of recess 68a, protuberance 68b.Wet film 43, by adjusting extruding force, can be formed recess 44a and protuberance 44b by this pressure regulator 70 more effectively.

As in this embodiment, it is preferable that shape gives and is provided with the tempering machine 73 for regulating circumferential surface temperature on roller 68.Shape is given the periphery temperature of roller 68 and is adjusted such that in the temperature range that the wet film 43 of gelation maintains gel state by this tempering machine 73.The temperature maintaining gel state is described above.Additionally, as in this embodiment, it is preferable that stripper roll 56 is also equipped with the tempering machine 74 for regulating circumferential surface temperature.The periphery temperature of stripper roll 56, also in the same manner as tempering machine 73, is adjusted such that in the temperature range that wet film 43 maintains gel state by this tempering machine 74.So, it is adjusted in the temperature range of the gel state maintaining wet film 43 by shape being given each periphery temperature of roller 68 and stripper roll 56, it is easier to and form recess 44a and protuberance 44b effectively.It addition, the residual solvent amount passing through the wet film 43 that shape imparting device 35 forms recess 44a and protuberance 44b is generally high than residual solvent amount when entering into heater 40.

The effect of said structure is illustrated.First rubber cement 31 and the second rubber cement 32 are fed separately to casting head 48 and collaborate inside casting head 48, spray to the band 46 advanced.Thus, utilize support roller 47 control temperature with 46 on the state of ground floor that formed by the first rubber cement 31 with stacking on the second layer formed by the second rubber cement 32 carry out curtain coating.The first rubber cement 31 and the second rubber cement 32 is sprayed continuously, owing to band 46 continues to advance, thus being continuously formed casting films 50 (the first operation) from casting head 48.

The casting films 50 formed is transported along with the traveling with 46.In this transport, by utilizing the heating supporting roller 47, utilizing the dry gas supply of pressure fan 52 and utilize the heating of back heater 53, make the evaporation of the solvent in casting films 50 carry out the dry of casting films 50, make casting films 50 gelation.

It is dried and the casting films 50 of gelation is peeling off position PP from band 46 stripping (the second operation) by stripper roll 56 with the state of gelation.As shown in Fig. 7 (A), the casting films 50 peeled off, i.e. wet film 43 are formed as the ground floor 43a that formed by the first rubber cement 31 and second layer 43b that formed by the second rubber cement 32 integrative-structure being laminated.Owing to the first rubber cement 31 and the second rubber cement 32 are with the state stacking containing a large amount of solvents, therefore it is formed without space between ground floor 43a and the second layer 43b between ground floor and the second layer in casting films 50 and in wet film 43.This wet film 43 gives device 35 to shape and transports.By controlling the periphery temperature of stripper roll 56, it is also maintained at gel state even if contacting with stripper roll 56.

When wet film 43 is transported to the position that shape gives roller 68, it is clamped in the shape in rotation and gives between roller 68 and stripper roll 56, give roller 68 by shape and extrude from second layer 43b side.Thus, in the part of held wet film 43, it is transferred on second layer 43b shown in the shape of recess 68a or protuberance 68b such as Fig. 7 (B).Owing to shape imparting roller 68 rotates while carrying out transporting at wet film 43, the second layer 43b of wet film 43 is alternatively formed the recess 44a and protuberance 44b (the 3rd operation) of the prism 22a as blooming 33 successively.

As described above, in the period forming recess 44a and protuberance 44b, shape gives the periphery temperature of roller 68 and is controlled in the temperature range of the gel state maintaining wet film 43, and therefore, wet film 43 is maintained gel state.Therefore, it is possible to more effectively and easily form recess 44a and protuberance 44b on the second layer 43b of wet film 43.

As described above, the wet film 43 being defined recess 44a and protuberance 44b by shape imparting roller 68 is transported to the first device for excising 37 from shape imparting device 35.Both sides are excised by wet film 43 by the first device for excising 37, and residual solvent quantitative change is that less than 300% rear guiding is to adding hot cell 40.Wet film 43 spends the time of at least 15 minutes, namely more than 15 minutes to add hot cell 40 from this to pass through.Thus, it is heated by this heating and is dried adding the period transported in hot cell 40.Before this is dry and during drying, in second layer 43b, heat-curable compounds mainly oozes out from recess 44a, makes cellulose acylate contained in second layer 43b carry out integrated with ground floor 43a.Heat-curable compounds oozes out with liquid, and the liquid level of the heat-curable compounds oozed out shifts in the way of uprising, and is maintained flat state by its levelling effect simultaneously.The heat-curable compounds oozed out is solidified by the heat from atmosphere, generates heat reactive resin, forms cured layer 22.Additionally, during this cured layer 22 is formed, the cellulose acylate of ground floor 43a and second layer 43b carries out integration, form cellulose acylate layers 21.So, by the oozing out of dry and heat-curable compounds, levelling, solidification, as shown in Fig. 7 (C), the blooming 33 (the 4th operation) formed by cellulose acylate layers 21 and cured layer 22 is obtained.

Owing to the first solvent and the second solvent evaporate by drying, blooming 33 becomes thinner than wet film 43 certainly.Additionally, with the evaporation of the first solvent and the second solvent, as it has been described above, the height of the degree of depth of the recess 44a in wet film 43 and protuberance 44b reduces respectively, the subtended angle of recess 44a and the drift angle of protuberance 44b increase respectively.Therefore, as shown in Fig. 7 (B) and (C), the height that blooming 33 is formed as the prism height H22a degree of depth than the recess 44a in wet film 43 and protuberance 44b is low, and the drift angle of the prism vertex angle θ 1 and subtended angle θ 2 subtended angle than the recess 44a in wet film 43 and protuberance 44b is big.

Cellulose acylate layers 21 and cured layer 22, owing to being transparent, have the function of the protecting film as polaroid.Blooming 33 has the high cured layer of refractive index ratio cellulose acylate layers 21 22; cured layer 22 with the interface of cellulose acylate layers on be formed with prism 22a; therefore, reflect when injecting to cellulose acylate layers 21 from the illumination light of light source cell 12 from cured layer 22.Thus, blooming 33 shows brightness raising function.Further, since prism 22a is formed in inside, when 33 changes of blooming are used for liquid crystal panel 11, owing to prism 22a does not contact with other parts, from without being destroyed in time.Therefore, brightness can be maintained and improve function.Owing to the face of cellulose acylate layers 21 side is smoothly formed, snugly can attach with polarizing coating 14b.

Blooming 33 is more than 0.2 due to the refractivity obtained with N22-N21, shows brightness more effectively and improves function.Additionally, heat reactive resin is owing to, in scope that refractive index is more than 1.50 and less than 2.20, thus fully giving the refractivity with cellulose acylate layers 21, showing brightness effectively and improving function.

Owing to the second rubber cement 32 employing the heat-curable compounds with the polymerizable group containing ethylenic unsaturated bond, thus preferred in making radical reaction carry out well and to form cross-linked structure.Additionally, due to heat-curable compounds has at least 2 above-mentioned polymerizable groups in 1 molecule, thus the blooming 33 of abundant hardness is had after can obtaining heat cure.By making the molecular weight of heat-curable compounds be more than 250, and compared with the situation of 250, the viscosity owing to containing the liquid object of the heat-curable compounds oozed out is higher, even if being interfered the transport of wet film 43 is medium, the impact of the flatness on surface is also less.Additionally, be less than 2000 by making the molecular weight of heat-curable compounds, ooze out on recess 44a and protuberance 44b more effectively in above-mentioned 4th operation, therefore can form cured layer 22 more effectively.

Add in hot cell 40, owing to wet film 43 is maintained at the temperature in the scope of more than 140 DEG C and less than 200 DEG C, thus being dried more effectively and the oozing out of heat-curable compounds, levelling, solidification, therefore can form prism 22a at cured layer 22 more effectively, and each face that smoothness is higher can be formed.Additionally, by being maintained at the temperature in above-mentioned scope, wet film 43 can be suppressed more effectively to modifiy, thus maintaining the good transport adding in hot cell 40 more effectively.Further, in adding hot cell 40, owing to wet film 43 carries out temperature adjustment by transporting the atmosphere around path, thus can simply and more effectively be dried and the oozing out of heat-curable compounds, levelling, solidification.

Each process of the first operation, the second operation, the 3rd operation, the 4th operation can be carried out as mentioned above continuously, thus manufacturing the blooming 33 of strip due to solution film-forming equipment 30.Blooming 33 utilizes devices for taking-up 42 to be rolled into a roll.Blooming 33 operation later being rolled into a roll cuts into the size of regulation, uses as prismatic lens 16.

It addition, in above-mentioned embodiment, utilize shape to give roller 68 and the wet film 43 in stripper roll 56 given recess 44a and the shape of protuberance 44b, as long as but the position ratio of imparting shape adds more upstream, hot cell 40, it is also possible to for other position.For example, it is also possible to configuration shape gives roller 68 and pressure roller (not shown) on the first device for excising 37 and the transport path that adds between hot cell 40, them are utilized to give shape on wet film 43.In addition it is also possible to 46 or drum etc. curtain coating supporter on casting films 50 on extrusion shapes give roller 68 and give shape.

Above-mentioned embodiment implements dry curtain coating, but it is also possible to substitute dry curtain coating by the so-called cooling curtain coating making its gelation by casting films 50 is dried and is cooled down.Now, tempering machine 51 by being supplied to support roller 47 by the heat transfer medium of cooling, in the way of the mobility of casting films 50 is lower than when only drying, and will band 46 cooling.During cooling curtain coating, by utilizing the cooling supporting roller 47, utilizing the supply of the dry gas of pressure fan 52 and utilize the cooling of back heater 53, casting films 50 in transit is lowered the temperature and gelation while making solvent evaporation be dried.Additionally, as curtain coating supporter, be not limited to band 46.For example, it is also possible to use drum alternative belt 46, the periphery of the drum being ejected in rotation by the first rubber cement 31 and the second rubber cement carries out curtain coating.When making the so-called dry curtain coating of casting films dry solidification, the bands 46 that use, during cooling curtain coating, many uses are roused but it also may use drum in dry curtain coating, or use is with in cooling curtain coating more.

In Fig. 8, casting device 90 gives roller 68 for extrusion shapes in casting films 50 and gives shape.Casting device 90 possesses drum 92 and carrys out the band 46 of alternate figures 4 as curtain coating supporter, and then, possess thermoregulator 93 and shape gives roller 68.For with the device shown in Fig. 4 and Fig. 5, structure that parts are identical, additional identical with Fig. 4 and Fig. 5 symbol, and omit the description.Casting head 48 sprays the first rubber cement 31 and the second rubber cement 32 towards drum 92 by superposition the second rubber cement 32 on the first rubber cement 31 in the way of carrying out curtain coating.Thus, the casting films 50 (the first operation) that formation ground floor and the second layer are laminated integratedly.The driving axle of drum 92 is connected with motor 92a, is rotated along the circumferencial direction (being counterclockwise in figure) shown in arrow by this motor 92a.By the rotation of these drums 92, transport casting films 50.

Shape gives roller 68 and is opposed to arrange with drum 92, the rotating shaft configured in parallel of rotating shaft and drum 92.Drum 92 uses as the curtain coating supporter cooling down curtain coating in this example embodiment.Controlling by utilizing thermoregulator 93 to make the heat transfer medium of cooling flow to the temperature of the periphery reducing drum 92 in drum 92 of the temperature of casting films 50.Control to make casting films 50 gelation by this temperature.The casting films 50 of gelation is directed to drum 92 by the transport of drum 92 and shape gives between roller 68, gives roller 68 by shape, from the second layer (not shown) the side extruding formed by the second rubber cement 32.Thus, shape gives the shape transfer of the recess 68a (with reference to Fig. 5) and protuberance 68b (with reference to Fig. 5) of roller 68 to the second layer of casting films 50.Owing to while carrying out transporting in casting films 50, shape imparting roller 68 rotates, in the same manner as the situation of wet film 43, the second layer of casting films 50 is alternatively formed the recess 44a (with reference to Fig. 5) as prism 22a and protuberance 44b (with reference to Fig. 5) (the 3rd operation) successively.

Casting films 50 is peeled off by stripper roll 56 with the state containing the first solvent and the second solvent, forms wet film 43 (the second operation).So, the 3rd operation can also after the second operation.It addition, in this example embodiment, stripper roll 56 is arranged in drum 92 side relative to the transport path of wet film 43.This is the shape of recess 44a and the protuberance 44b formed to be maintained in casting films 50.With use Fig. 4 solution film-forming equipment 30 time same, wet film 43 is directed to the first device for excising 37.Then, through utilizing the 4th operation adding hot cell 40 to form blooming 33, devices for taking-up 42 is utilized to be rolled into a roll.

In the respective embodiments described above, carry out the so-called curtain coating altogether being ejected into curtain coating supporter by the first rubber cement 31 and the second rubber cement 32 with the state of superposition from a casting head 48.However, it is possible to think known so-called gradually curtain coating from the casting head ejection being arranged the direct of travel at curtain coating supporter of the first rubber cement 31 and the second rubber cement 32.In above-mentioned example, it is illustrated using the example that blooming 33 uses as the prismatic lens of fully-reflected type but it also may use as refractive prismatic lens.

[embodiment]

[embodiment 1]～[embodiment 4]

Implement the embodiment 1～4 utilizing the solution film-forming equipment casting device 34 of solution film-forming equipment 30 being replaced by casting device 90 and obtain, manufacturing blooming 33 by cooling down curtain coating.The thickness of cellulose acylate layers 21 and cured layer 22 respectively 40 μm.Cellulose acylate as the first rubber cement 31 and the second rubber cement 32 uses TAC.Heat-curable compounds as the second rubber cement 32, embodiment 1 uses the Nippon Synthetic Chemical Industry Co., Ltd UV-1700B (refractive index is 1.58), embodiment 2 uses KAYARAD (registered trade mark) DPHA (refractive index is 1.50) of Nippon Kayaku K. K, embodiment 3 uses Toagosei Co., Ltd Aronix (registered trade mark) M-309 (refractive index is 1.52), embodiment 4 uses Kyoeisha Chemical Co., Ltd. LightacrylateNP-A (refractive index is 1.50).Shown in " molecular weight " hurdle of the molecular weight of these heat-curable compounds such as table 1, the quantity (functional group number) of polymerizable group is as shown in " quantity of polymerizable group " hurdle of table 1.

Utilize shape to give roller 68 and the casting films 50 that residual solvent amount is 270% is formed recess and protuberance.To use roller vertex angle theta 3 be 90 °, as the shape that interval P68a the is 50 μm imparting roller 68 of the distance between each summit of protuberance 68b adjacent in a circumferential direction and protuberance 68b.The atmosphere adding the inside in hot cell 40 is adjusted to 190 DEG C, transports wet film 43 with 15 minutes by adding hot cell 40.

To obtained each blooming 33, measure the refractive index N21 of the cellulose acylate layers 21 and refractive index N22 of cured layer 22, brightness is carried the H.D smoothness with or without the face with cured layer 22 side and is evaluated.Each evaluation methodology and benchmark are as described below.Refractive index N21 and refractive index N22 is measured by numeral Abbe refractometer DR-A1 (Co., Ltd.'s Atago system).Refractive index 21 in each blooming 33 is 1.48.Refractive index 22 is as shown in " refractive index N22 " hurdle of table 1.

1, brightness carry H.D with or without

Observed and brightness increase rate by following microscope, brightness is carried H.D with or without being evaluated.

(1) microscope is observed

Obtained each blooming 33 is made of microtome the cross-sectional slice of thickness direction, with optical microscope, it is observed.By this observation, with the situation at the interface of the cured layer 22 that confirms cellulose acylate layers 21 and be formed with multiple prism 22a for qualified, with confirm less than situation for defective.About the result that this microscope is observed, it is qualified that the blooming 33 of any embodiment is.

(2) brightness increase rate

First, as authentic specimen, manufacture and internal do not form prism 22a, for single layer structure, planar film that two faces are smooth.The polymer used in rubber cement is TAC.Obtained planar film is measured brightness with following method, with the brightness of this planar film for B1.The brightness of each blooming 33 is measured, with the brightness of blooming 33 for B2 by the method same with the brightness of planar film.Then, by { formula of (B2-B1)/B1} × 100 obtains brightness increase rate (unit is %).

The assay method of brightness is as follows.In the mode that cured layer 22 and light table (electric flux industry Co., Ltd. system, surface illuminator, light source: Commercial optical lamp Panasonic Co., Ltd. 86W/HF manages, FHF86EX-D, 10) connect, blooming 33 is placed in light table.Distance blooming 33 be 350mm measure front face brightness above through luminance meter (Topcontechnohouse company of Co., Ltd. system, BM-9A), with it for brightness.

Microscope is viewed as the average evaluation that qualified, brightness increase rate is more than 5% and improves function for having brightness.Additionally, microscope is viewed as underproof situation and microscope is viewed as qualified but average evaluation that brightness increase rate is less than 5% for without brightness raising function.The brightness increase rate obtained by said method of the blooming 33 of any embodiment is 10%, and result improves function for having brightness.

2, the smoothness of face

On the face of cured layer 22 side of each blooming 33, in a first direction with interval 5cm take 3 places, and the vertical second direction of first direction on take 6 places with interval 5cm, 9 places will be added up to as measuring subject area.9 measure the size that subject area is respectively 600 μ m 600 μm.For each mensuration subject area, carry out with the mensuration of the Japanese Industrial Standards JISB0601-2013 arithmetic average roughness Ra being benchmark, 9 obtained arithmetic mean roughness be Ra1, Ra2, Ra3, Ra8, Ra9.The device used is Pedicellus et Pericarpium Trapaeization System VertScan2.0.The arithmetic mean of instantaneous value (unit: μm) smoothness as face is obtained with (Ra1+Ra2+Ra3++Ra8+Ra9)/9.

The situation that the smoothness of obtained face is more than 1 μm and less than 5 μm is set to A, will be greater than 5 μm and be that the situation of less than 10 μm is set to B, will be greater than the situation of 10 μm and be set to C.A and B is qualified, and C is defective.This result is as shown in table 1.

[table 1]

	Molecular weight	The quantity of polymerizable group	Refractive index N22	The smoothness of face
					Embodiment 1	2000	10	1.58	A
Embodiment 2	579	6	1.50	A
					Embodiment 3	296	3	1.52	A
Embodiment 4	212	2	1.50	B

[comparative example 1]

It is the methacrylic acid 2-methoxy acrylate of Rhizoma Sparganii Rayon Co., Ltd. of low 1.42 than cellulose acylate that the TAC of the second rubber cement 33 of embodiment is replaced by refractive index, carries out the manufacture of blooming.Other condition is identical with embodiment.Between cured layer and cellulose acylate layers 21, confirm interface, the cured layer interface with cellulose acylate layers 21 confirms multiple prism.Therefore, it is qualified in the evaluation that above-mentioned microscope is observed.But, the refractive index N21 of cellulose acylate layers 21 is 1.48, and the refractive index of cured layer is 1.42, after obtaining above-mentioned brightness increase rate, for putting forward H.D result without brightness.For comparative example 1, owing to for putting forward H.D result without brightness, the evaluation of the smoothness of face being therefore not carried out.

Claims (13)

1. a blooming, it is characterised in that possess:

Cellulose acylate layers, it has the one side becoming a face, containing cellulose acylate；With

Cured layer; it has the one side becoming another face; formed on the another side of described cellulose acylate layers by transparent heat reactive resin, higher than the refractive index of described cellulose acylate layers, with the interface of described cellulose acylate layers on there is multiple prism.

2. blooming according to claim 1, wherein, described cellulose acylate is Triafol T.

3. blooming according to claim 1 and 2, wherein, the refractive index of described heat reactive resin is the scope of more than 1.50 and less than 2.20.

4. blooming according to claim 1 and 2, wherein, described heat reactive resin is the resin that the heat cure of the heat-curable compounds by having the polymerizable group containing ethylenic unsaturated bond generates.

5. blooming according to claim 4, wherein, described heat-curable compounds has at least 2 described polymerizable groups in 1 molecule.

6. blooming according to claim 1 and 2, wherein, described blooming is configured on the described polarizing coating of the light source side of the liquid crystal indicator with liquid crystal cells and 2 polarizing coatings, arranges with the state closely sealed with the light source side of described polarizing coating.

7. a solution film-forming method, it is the solution film-forming method manufacturing the blooming with multiple prism, it is characterised in that have following operation:

First operation: by being continuously cast the first rubber cement and the second rubber cement on the curtain coating supporter advanced, forms the ground floor formed by described first rubber cement and casting films that the second layer formed by described second rubber cement is laminated；Described first rubber cement contains cellulose acylate and the first solvent, and described second rubber cement contains cellulose acylate, for being generated heat-curable compounds and second solvent of the high transparent heat reactive resin of refractive index ratio cellulose acylate by heat cure；

Second operation: by having the state of described first solvent and described second solvent to form wet film from stripping described curtain coating supporter with remaining described casting films；

3rd operation: utilize the shape imparting roller being along the circumferential direction alternatively formed multiple recesses that cross section that the width in described casting films extends is triangle and protuberance on the circumferential surface, from described second layer side, described casting films in transit or described wet film are extruded, thus being continuously formed the plurality of prism on the described second layer；And,

4th operation: by transporting at least 15 minutes relative to the described casting films that solid constituent is less than 300% or described wet film limit heating edge through described 3rd operation, residual solvent amount, make described heat-curable compounds ooze out on the plurality of prism, and described casting films or described wet film are dried make described heat-curable compounds solidify.

8. solution film-forming method according to claim 7, wherein, in described 4th operation, is heated and maintained at the temperature in the scope of more than 140 DEG C and less than 200 DEG C by described casting films or described wet film.

9. the solution film-forming method according to claim 7 or 8, wherein, described 4th operation by transporting thus described casting films or described wet film are heated in the atmosphere have adjusted temperature.

10. the solution film-forming method according to claim 7 or 8, wherein, the refractive index of described heat reactive resin is the scope of more than 1.50 and less than 2.20.

11. the solution film-forming method according to claim 7 or 8, wherein, the molecular weight of described heat-curable compounds is in the scope of more than 250 and less than 2000.

12. the solution film-forming method according to claim 7 or 8, wherein, described heat-curable compounds has the polymerizable group containing ethylenic unsaturated bond.

13. solution film-forming method according to claim 12, wherein, described heat-curable compounds has at least 2 described polymerizable groups in 1 molecule.