TW201131211A - Optical sheet and backlight unit using the same - Google Patents

Abstract

The goal of the present invention is to provide an optical sheet capable of preventing the sticking of other optical sheets or the like laminated on a rear face side while preventing damages to the surface of other optical sheets or the like. The optical sheet has a transparent base-material layer, an optical layer laminated on one face side of the base material layer, and a sticking prevention layer laminated on the other face side of the base material layer, with the whole surface of the sticking prevention layer being minutely uneven, characterized in that the sticking prevention layer is composed of a plurality of phase-separated resins, a domain phase is distributed in a matrix phase and has a double sea-island structure distributing a granular phase in the domain phase. The main material in the matrix of the sticking prevention layer is preferably urethane (meta) acrylate resin, the main material of the domain phase (meta) is preferably acrylic resin and the main material of the granular phase (meta) is preferably acrylic resin.

Description

201131211 VI. Description of the Invention: [Technical Field] The present invention relates to an optical sheet having a high anti-stick function and an anti-damage function and a backlight unit using the same. [Prior Art] A liquid crystal display device is widely used as a display device for a screen such as a television or a personal computer. It is roughly classified into a direct view type for directly viewing a display screen and a projection type for viewing an image projected on a screen. The direct-view type liquid crystal display device has a transmissive type that transmits light of a backlight, a reflection type that uses a natural light or an indoor light without a backlight, and a semi-transmissive type that becomes a reflective type in a bright place and a transmissive type in a dark place. On the other hand, the projection type liquid crystal display device has a rear type which is projected before the image is projected on the front screen and a screen is mounted in the display cabinet to project the image. In general, users of the present invention are mainly in direct-view type transmissive liquid crystal display devices. In a transmissive liquid crystal display device, a backlight having a liquid crystal layer irradiated from the back surface is widely used, and a backlight unit such as an edge light type (side light type) or a direct type is provided on the lower surface side of the liquid crystal layer. As shown in FIG. 2, the backlight unit 20 of the end face illumination type generally includes a lamp 21 as a light source, a square plate-shaped light guide plate 22 whose end portion is disposed along the lamp 21, and a layered on the light guide plate 22. A plurality of optical sheets 23 on the surface side. As the light source 21, an LED (Light Emitting Diode) or a cold cathode tube is used. However, in view of miniaturization and energy saving, LEDs are generally used. The optical film 201131211 has an optical function of diffusing, refracting, and the like for the transmitted light, and uses (1) a cymbal 24 disposed on the surface side ' of the light guide plate 22 and having a refractive function toward the normal direction side; and (2) The light diffusion sheet 25 and the like which are disposed on the surface side of the cymbal sheet 24 and mainly have a light diffusing function. Further, although not shown, a backlight in which a plurality of optical sheets 23 such as a light diffusion sheet or a cymbal sheet are disposed in consideration of the light guiding characteristics of the light guiding plate 22 or the optical function of the optical sheet included in the optical sheet 23 is also considered. unit. The function of the backlight unit 20 will be described below. First, the light incident from the lamp 21 to the light guide plate 22 is reflected on a reflection point or a reflection sheet (not shown) on the back surface of the light guide plate 22 and reflected on each side surface, and is self-guided. 22 surface is emitted. The light emitted from the light guide plate 22 is incident on the cymbal sheet 24, and is refracted toward the normal side by the crotch portion formed on the surface of the plurality of ridges, i is emitted from the surface. Thereafter, the light emitted from the surface of the cymbal sheet 24 is incident on the light diffusion sheet 25, diffused, and emitted from the surface, thereby illuminating the liquid surface (not shown) above. As shown in FIG. 2(b), the light diffusion sheet 25 having the double side and the surface of the cymbal sheet 24 is provided with a transparent base layer of a synthetic resin layer and an optical layer 27 laminated on the surface of the base material layer 26. And an anti-adhesive layer 28 laminated on the back side of the substrate layer %. The optical layer 27 is generally configured to have a structure in which the binder beads 29 are divided into % of fat beads, and the light-diffusing function is transmitted through the transmitted light. The anti-adhesive layer 28 has a small amount dispersed in the adhesive 31: And the lower portion of the far bead 32 protrudes from the back surface of the adhesive 31. The mysterious anti-adhesive layer 28 prevents the following problem: the back surface of the light-diffusing sheet 25 is adhered to the surface of the "optical sheet" (the sheet 24) ( That is, it is adhered to generate dry 4 201131211 disturbing strips)' or it is wound (attached) when it is wound into a roll in the manufacturing step for storage. Further, since the apex of the prism portion is not an acute angle, a plurality of planes are formed. Or the curved surface, so that the surface side of the cymbal sheet 24 and the back side of the light diffusion sheet 25 are in strip contact with the surface, and are adhered to the strip surface. The dispersion is dispersed in the release layer 28 of the light diffusion sheet 25. The bead 32 is generally made of acrylic beads or the like, and is relatively hard, so that the bead 32 protruding from the back surface may be laminated on the surface of the crotch sheet 24 or the like laminated on the back side of the light diffusion sheet 25. The apex part) causes damage. Also, it is dispersed in the anti-adhesive The bead 32' in 28 is detached due to contact with the apex of the crotch portion 24, and the detached portion of the bead 32 is also a major cause of damage. The damage caused to the optical sheet causes the liquid crystal display device to In order to prevent damage to the ruthenium or the like on the back side or other optical sheets or light guide plates, an optical sheet having a damage preventing layer on the back surface is developed (refer to Sakamoto Kaikai 2004_85626, etc.) Or an anti-adhesive-curable resin composition which is coated and hardened to form fine irregularities on the surface (see Japanese Patent Laid-Open Publication No. 2007-182519, etc.). In the optical sheet of the damage layer, there are also fine beads which are prevented from adhering to each other, so that it is not possible to sufficiently prevent damage to other optical sheets, etc. Further, the surface of the optical sheet having the anti-adhesive curable resin composition is formed into irregularities on the surface. In the case of the following, there is a problem that the unevenness of the surface is too fine and the anti-adhesive property is insufficient, and if it is to increase the degree of the optical film of 201131211, When the coating film of the anti-adhesive-curable resin composition is thinned, the unevenness of the formed film becomes finer, and the anti-adhesive property is further insufficient. Patent Document 1: JP-A-2004-85 626 Patent Document 2 The present invention has been developed in view of such problems, and an object of the present invention is to provide adhesion prevention of other optical sheets or the like laminated on the back side and prevent the adhesion to the optical sheet or the like. An optical sheet that causes damage on the surface of another optical sheet or the like, and a high-quality backlight unit that uses the optical sheet to prevent unevenness in brightness and interference fringes caused by damage, etc. The invention developed to solve the above problem is an optical a sheet having a transparent base material layer, an optical layer laminated on one surface side of the base material layer, and an anti-adhesion layer laminated on the other surface side of the base material layer, and having a fine uneven shape on the entire surface of the release layer The anti-adhesive layer is composed of a plurality of phase-separated resins, and has a domain phase dispersed in a matrix phase, and a domain phase Loose granular phase has a dual structure of the island. In the optical sheet, the anti-adhesive layer is composed of a plurality of phase-separated resins and has a double island structure in which a phase phase is dispersed in the substrate phase and a granular phase is dispersed in the domain phase. According to the optical sheet, since the release layer has such a double island structure, the fine unevenness of the surface of the release layer can be effectively formed. Thereby, the anti-adhesive layer exerts a high anti-adhesive property, and adhesion to other sheets laminated on the side of the anti-adhesion layer can be preferably prevented. At the same time, the optical sheet can also prevent damage caused by the unevenness of the surface of the anti-adhesion layer 6 201131211. Further, according to the optical sheet, since the surface of the anti-adhesive layer has such a double island structure, even if the thickness of the anti-adhesion layer is made thin, it is easy to form irregularities sufficient to exhibit the anti-adhesive property. Thus, the optical sheet can make the thickness of the release layer thin, thereby preventing the brightness from being lowered due to the provision of the release layer. Further, it is possible to produce an optical sheet having an anti-adhesion layer having a desired thickness and surface roughness. The main material in the substrate phase of the anti-adhesive layer is preferably a urethane (meth) acrylate resin, and the main material of the domain phase is preferably a (mercapto) acrylic resin, and the granular phase The main material is preferably a (fluorenyl) acrylic resin. The main materials of the respective resin phases constituting the phase separation of the release layer are the above-mentioned resins, whereby the unevenness of the surface of the release layer is more effectively formed, so that the anti-adhesive property of the optical sheet is further improved. At the same time, the resin forming the release layer is a (meth)acrylic resin, so that the optical sheet ensures high brightness. A convex portion may be formed in a scattered manner on the surface of the above-mentioned release layer by a dispersed granular phase. The convex portion is formed in a scattered manner on the surface of the release layer by the dispersed granular phase, whereby the anti-adhesive property of the optical sheet can be exhibited very effectively. At the same time, the convex portion on the surface of the anti-adhesive layer is formed of a resin, so that damage to other optical sheets or the like due to the uneven shape can be prevented. The average thickness of the anti-adhesive layer is 〇5 " m or more and 4 V m or less, and the arithmetic mean roughness (Ra) of the surface of the anti-adhesion layer is preferably 〇〇3 Am or more and 〇3/m or less, and roughness The average length (RSm) of the curve element is preferably 4 〇"m or more 4 〇〇" below the claw. The arithmetic mean roughness (Ra) of the surface of the release layer and the average length (RSm) of the roughness curve elements are relatively small values of the above range, whereby 201131211 can be preferably prevented from being laminated on the side of the release layer. The other sheets are adhered and damage caused by the fine uneven shape of the surface of the release layer can be prevented. Further, in the optical sheet, since the average thickness of the release layer is as thin as 〇5//ηι or more and 4 or less, it is possible to prevent the brightness from being lowered due to the provision of the release layer. Therefore, in the backlight unit for a liquid crystal display device in which the light emitted from the lamp is dispersed and guided to the surface side, if the optical sheet is provided, the high optical damage resistance of the optical sheet can prevent the other optical sheets from being prevented. The occurrence of unevenness in brightness or the occurrence of interference fringes caused by damage such as damage can improve the quality of the liquid crystal display screen and facilitate handling during manufacturing, handling, storage, and the like. Here, the "optical layer" is a concept that means a layer that exhibits a specific optical function for transmitted light, specifically, a light diffusion layer having a light diffusing agent in a binder; (b) A light-diffusing layer which is formed substantially uniformly on the surface by embossing, and a layer of a layer having a triangular columnar shape, and also includes a case where the substrate layer is formed. X, "Arithmetic mean coarse sugar (Ra)", ^ "10-point average rough seam (Rz)" is based on jisb嶋 1994, "average length of rough seam curve elements (RSm)" and "root mean square thickness" The H degree (Rq/" is based on the claw deletion 01-2001, and the cut m 2 5 coffee, the evaluation length is the value. The "wrong pen hardness" is based on the pencil scratch value of the jis κ5 test method 8.4. According to the invention, the optical lens of the present invention has a well-known irregularity on the surface of the anti-adhesive layer, and even if the thickness of the anti-adhesive layer is not smashed, it is ensured that the unevenness of the filling blade is formed, thereby ensuring the other Sheet 4 is more resistant to sticking, 201131211 and can prevent it The surface light unit such as a sheet can prevent the occurrence of damage due to the occurrence of optical sheets, unevenness, or interference fringes. The surface is damaged. Moreover, the manufacturing, handling, storage, etc. of the brightness caused by the damage of the back light guide plate or the like of the present invention. [Embodiment] The embodiment of the present invention will be described below in detail with reference to the drawings. The anti-adhesive layer laminated on the other side of one of the base material layers 2 has the base of the optical sheet 1 of Fig. 1. The optical layer 3 on the surface side of the material layer 2 and the layered on the base material layer 4, the base material layer 2 must transmit light, and thus are formed of transparent, especially glass or synthetic resin. The synthetic resin of 2 is not particularly limited, and examples thereof include polyethylene terephthalate, polyethylene naphthalate, acrylic resin, and a# fragrant poly vinegar, polystyrene, and polyolefin. H, such as cellulose acetate 1 vinyl chloride, is preferably polyethylene terephthalate, which is excellent in transparency and high in strength, and is preferably improved in bending properties. Ethylene terephthalate. Thickness of substrate layer 2 The average thickness is not particularly limited, and is, for example, U) an upper 500...lower than preferably 35...upper and lower, more preferably 50...upper than 188 centimeters. If the range of the base material layer is used for coating When the resin composition of the light is formed, the valley is liable to cause curling, which is difficult to handle. On the other hand, if the thickness of the layer 2 is outside the above range, the liquid crystal display device may fall down to 201131211, and the backlight unit may also be caused. The increase in thickness is contrary to the requirement for liquid crystal display. The anti-adhesive layer 4 has a fine uneven shape on the entire surface. Therefore, if the optical sheet i is superposed on another surface of the optical sheet or the light guide plate such as a prism sheet: Then, the convex portion of the fine uneven shape 7 abuts on the other light surface ′, and the entire back surface of the optical sheet i does not abut against the other optical sheets or the like to prevent adhesion of other optical sheets or the like, and the liquid is inhibited. The brightness of the screen without the device is not uniform. In the optical sheet 1 of the present invention, the surface of the release layer 4 is composed of a plurality of resins which are phase-separated, and has a double island structure in which a phase phase is dispersed in a substrate phase and a granular phase is dispersed in a domain phase. Since the release layer has such a double island structure, the fine unevenness of the surface of the release layer is effectively formed. By virtue, it can exert higher anti-adhesive properties and can better prevent adhesion to other sheets laminated on the side of the anti-adhesive layer. At the same time, damage caused by the convexity of the surface of the anti-adhesive layer can be prevented. Further, since the anti-adhesive layer has such a double island structure', the thickness of the anti-adhesion layer is made thin, and it is easy to form irregularities sufficient to prevent sticking. Thereby, the thickness of the release layer can be made thin, so that the decrease in brightness due to the setting of the anti-adhesion layer can be prevented. Further, an optical sheet having an anti-adhesion layer having a desired thickness and surface roughness can be obtained. Since the surface of the anti-adhesive layer has a double island structure, the fine concavities and convexities are effectively formed, and even if the thickness of the anti-adhesion layer is thin, it is not clear why it is easy to form sufficient concavities and convexities. The polymerization shrinkage or the particle formation caused by each of the resin phases is combined to form finer irregularities or the like. 10 201131211 Such a release layer has a double island structure in which a domain phase is dispersed in a matrix phase in which a granular phase is dispersed, and can be observed using, for example, an electron microscope. The resin for forming each phase in the above-mentioned release layer is not particularly limited, and examples thereof include an acrylic resin, a (meth) acrylate resin, an epoxy (meth) acrylate resin, and an ester (mercapto) acrylate. Resin, olefin resin, polystyrene resin, styrene copolymer, norbornene resin, polycarbonate resin, polyether resin, polyethersulfone resin 'polyester resin, polyurethane resin, polyoxyalkylene resin, polydecane resin , (polyamide) resin, polyimide resin, melamine resin or fluororesin, etc., may be exemplified by a homopolymer or copolymer of (mercapto)acrylic monomer, (mercapto)acrylic acid a copolymer of a body and another monomer having an ethylenically unsaturated double bond, and the like. Examples of the olefin resin include polyethylene, polypropylene, an ethylene-propylene copolymer, an ethylene-vinyl acetate copolymer, an ionic polymer, an ethylene-vinyl alcohol copolymer, and an ethylene-ethylene copolymer. Examples of the polyether resin include polyethylene glycol, polypropylene glycol, and polybutylene glycol. Examples of the polyester resin include polyethylene terephthalate, polybutylene terephthalate, an unsaturated polyester resin, and an alkyd resin. The resin may be a copolymer having two or more structural units of the resins, or a copolymer composed of structural units of the resins and other monomer units. Among them, the main material of the substrate phase is preferably an (meth) acrylate resin, an epoxy (meth) acrylate resin or an ester (meth) acrylate resin. By using such a polar group-containing acrylic resin as the main material in the substrate phase, the above double island structure is effectively exhibited, and the unevenness of the surface of the anti-adhesive layer becomes large. As a result, the anti-adhesive property of the optical sheet is enhanced. Further, even when the thickness of 11 201131211 #H is thin, sufficient unevenness is formed on the surface of the anti-adhesive I, so that the anti-adhesive property of the optical sheet is ensured. Among them, the double island structure is more effectively exhibited, and the anti-adhesive property of the obtained optical sheet is further improved into a y 'strong aspect and 5' is preferably a (methyl) acetoacetate vinegar resin. Preferably, the (sub-base) acrylic resin, and the main material of the granular phase, preferably a (meth)acrylic resin, is used as a host material of the domain phase and the granular phase by using an acrylic resin. 'The optical sheet with higher brightness can be obtained. In the above anti-adhesion layer, the main material in the substrate phase is (meth) acrylate resin, the main phase of the phase is coarse & Acrylate, the main material of the granular phase is (meth)acrylic resin. By using the combination of 4j, Nippori, and the like as the resin forming the anti-adhesive layer, The above-mentioned double island structure is obtained. As a result, the surface of the anti-adhesive layer is particularly convexly formed, and the anti-adhesive property of the optical sheet can be improved. Further, an optical sheet having a higher brightness can be produced. The surface of the 棺田刀政 is granular and the convex portion is formed in a scattered manner. In the optical sheet By virtue of the (four) layer table such protrusions, the higher anti-purity property is exerted, and the adhesion to other sheets laminated on the side of the anti-adhesion layer can be preferably prevented. m viscous and the convex portion is made of resin Forming, the hardness is relatively low. As a result, the #风之先学片 can prevent the damage caused by the unevenness of the surface of the anti-adhesion layer. The lower limit of the average thickness of the anti-adhesive layer 4 of the clothing m, dry and 1 main ϋ · 5 /zm, and then the age is preferably 1//m, especially preferably 1.5 extended. In other respects, the upper limit of the anti-adhesive layer is 4 degrees, preferably 4 to m, and @* dry and ΊΣ two 3 · 5 to m, You Wei helmet 7 ,

m. If the average thickness of the anti-adhesive layer 4 is less than the above lower limit, then the coating of the monomer or the oligomer and the hardening of the fine embossed shape 7 by the coating of % ρ Λ and 疋 月 月 9 are 12 201131211 It is difficult to form a bump shape of a sufficient size. On the other hand, if the average thickness of the anti-adhesive I 4 exceeds the above upper limit, the amount of light absorption by the anti-adhesion layer 4 increases, thereby causing a decrease in light transmittance. The lower limit of the arithmetic mean roughness (Ra) of the surface of the anti-adhesive layer 4 is preferably 0.03 #m, and further preferably 〇〇5 "m, especially preferably 〇〇8 #爪. Another--the arithmetic mean coarse The degree of seam (the upper limit of R〇, preferably 0.3# m, : and preferably 0.25# m' is preferably 〇2"m. If the arithmetic mean roughness (Ra) of the surface of the release layer 4 is less than the above lower limit When the fine concavo-convex shape 7 is reduced, the portion other than the convex portion is also in contact with the surface of the other optical sheet or the like, and the anti-adhesive function is not exhibited. Conversely, if the surface of the anti-adhesion layer 4 has an arithmetic mean roughness ( Ra) exceeds the above-mentioned upper limit, and has a roughened concavo-convex shape and causes damage to the surface of other optical sheets disposed on the back surface. The lower limit of the average length (RSm) of the (four) degree curve element of the surface of the anti-point layer 4 Preferably, it is 40#m, and further preferably 8 (^m, particularly preferably 12〇_. On the other hand, the upper limit of the average length (Rsm) of the coarse sugar curve element is preferably 4〇〇" m' is further preferably 24 〇"m. By the average length (RSm) of the roughness curve elements of the surface of the anti-adhesive layer 4 The relatively small value of the range, and the fine concavo-convex shape? is island-shaped and the average terrain f is on the entire surface', so even if the arithmetic mean rough degree (RO is a relatively small value of the above range, It is possible to prevent interference fringes due to adhesion (adhesion) to the surface of the light guide plate, etc. Especially when the arithmetic mean coarse sugar (Ra) is made smaller, the average length (RSm) of the thick seam curve elements is In the above range, the fine concavo-convex shape 7 is formed in an island shape and uniformly formed on the entire surface, whereby the anti-adhesive layer 4 13 201131211 can also be in contact with the apex of the strip-shaped ridge portion on the surface of the cymbal sheet. The abutting portion and the non-contact portion are formed. Therefore, according to the optical sheet 1, the anti-adhesive function for the surface of the cymbal sheet (the side of the crotch portion) can be effectively exhibited. When RSm is less than the lower limit, there is a risk of damage to the surface of another optical sheet or the like which is abutted due to the reduction in size of each convex portion. Further, on the surface of the cymbal sheet (the side of the crotch portion) and the anti-adhesive layer 4 contact situation When there is no contact between the apex of the band-shaped crotch portion and the anti-adhesive f 4 , the average length (RSm) of the roughness curved surface element exceeds the upper limit. In addition, the fine uneven shape is not formed sufficiently, and the surface other than the convex portion abuts against the surface of another optical sheet or the like, thereby causing interference fringes. The ten-point average roughness of the surface of the anti-adhesion layer 4 ( The lower limit of Rz), preferably 0.2//m' is preferably 〇.3" m, and further preferably 〇4" claw. On the other hand, the upper limit of the ten-point average crude sugar (Rz) is preferably i is m, more preferably Um' and further preferably 〇.8/zm. If the ten-point average roughness (Rz) of the surface of the anti-adhesive layer 4 is less than the above lower limit ', there may be a fine concavo-convex shape on the surface of the anti-adhesion layer 4; in R 7 , the surface other than the convex portion and the surface of other optical sheets or the like Abut, and the adhesion occurs. On the other hand, if the ten-point average roughness (Rz) is larger than the above-mentioned upper limit, the uneven shape becomes too rough and damages the surface of other optical sheets or the like laminated on the back side. The lower limit of the ratio (Rz/Ra) of the ten-point average roughness (Rz) of the anti-adhesive layer 4 to the arithmetic mean roughness (Ra) is preferably 3, and particularly preferably 4, 14 201131211 and further preferably 5 On the one hand, the upper limit of the ratio is preferably 10', particularly preferably 9, and further preferably 8. The ten-point average roughness (Rz) of the release layer 4 is set to a value as small as the above range with respect to the arithmetic mean thick chain degree (Rz/Ra ratio), whereby the optical sheet can have a uniform The optical sheet 1 can prevent the damage of the other sheets which are generated by the force concentrated on the particularly protruding portion of the convex portion of the fine uneven shape 7 of the release layer 4, and can be prevented. Prevent damage to the surface of other optical sheets or the like due to the protruding portion of the protrusion. If the ten-point average roughness of the anti-adhesive layer 4, the ratio of (RZ) to the arithmetic mean (10) degree (Ra) (Rz/Ra) When the ratio is less than the lower limit, it is difficult to sufficiently form the fine uneven shape 7. When the ratio (Rz/Ra) exceeds the upper limit, the difference in the degree of the curvature of the convex portion f5 v of the fine uneven shape may become conspicuous. The force is concentrated on the portion, thereby causing damage to the surface of other optical sheets, etc. The lower limit of the root mean square roughness (Rq) of the surface of the anti-adhesive layer 4 is preferably 〇·〇切m' is preferably 〇. 〇7 heart, and then preferably 〇. On the other hand, the root mean square coarse rotation (Rq) Limit, fortunately, good for 〇.4 (four), especially for 〇·3 and then preferably for 〇.2"m. According to the optical sheet, the root mean square roughness (Rq) of the anti-adhesive layer* surface is as small as The value of the above range is such that the inclination of the fine uneven shape 7 is gently formed, and damage of other optical sheets of the laminated layer can be prevented. If the root mean square roughness (Rq) of the surface of the release layer 4 is less than the above lower limit, If the formation of the concavo-convex shape 7 is insufficient, there is a problem that the anti-point function is lowered. Conversely, if the root mean square thickness (Rq) exceeds the above-mentioned upper =, the steep portion of the thin concavo-convex shape 7 is generated. Thereby, the light guide (4) is generated near the steep slope (4) (4). 15 201131211 The surface of the anti-adhesive layer 4 and the lower limit of the average height (h) of each convex knife are better than the ancient "m' It is preferably the upper limit of the flatness (h), preferably 3 # m, and more preferably 2.5 # m, and more preferably 2/^ni. ρ , , according to the 3 HAI dry film, so that the convex portions of the release layer 4 are averaged.) as described above, it becomes relatively small, thereby reducing other Science sheet ^ shell surface of the left foot injury, and when the shallow depth of flaw can be damaged. If the tenth degree (h) of each convex portion .x is less than the above lower limit, sufficient anti-adhesion, ... anti-adhesive work cannot be exerted. On the other hand, if the average height (1) exceeds the above upper limit, there is a wind. Shi, he first caused damage to the surface of the sheet, and the resulting scar became ice. Further, the specific area was observed with a laser microscope 7 bar f, and the degree was calculated from the average height of the plurality of convex portions observed by the average height of the 16 convex portions. The surface of the anti-adhesive layer 4 is preferably a lower limit of the average protrusion diameter (5) of 2", preferably 2 hearts' is preferably 2 sides, and the average protrusion # fr, +, is a heart, and further preferably 5_ , especially preferably 4.5 and further preferably 4 to m. The roots of the ancient ruins and the surface of the μ are long-lasting Ακ八康. The first dry film is so that the average convex portion of the anti-adhesive layer 4 is slightly smaller, whereby the 迠+#t(Π) becomes relatively relatively as described above, thereby reducing the damage of other optical sheets. #夕复广命+ The sorrow of the sorcerer's face, and the scar of the wound of the king's moxibustion can be narrower. Less than the right convex. The average protrusion diameter of the enthalpy (Γι) The average sudden w over == can. On the contrary, if the damage is caused and the wound is wounded: width: raw = learning "the diameter of the face" (r'w & ilm wide and then the 'average average of the sudden observation of the home built in the special area for observation, borrow From W眺Cai's complex convex part to Putian. It is more like the average of 16 convex parts. 16 201131211

The diameter of the protrusion is counted. V, field + L degree (h) 90〇 / ^ dog has diameter (r,) ' refers to the diameter of the section obtained by cutting the high degree (0.9h) of the convex part, the average value is based on The Fermlet diameter (the interval at which the image is projected by the parallel line in the 疋 direction) is calculated. The convex portion of the surface of the anti-adhesive layer 4 is the center m, and the lower limit of the preferred A 60" (~) is preferably ^6#m, and more preferably 70"m. On the other hand, the upper limit of the average diameter (Γ2) is preferably 2〇〇..., and more preferably, m. According to the optical sheet, the anti-adhesive layer is made to have a second diameter (which is relatively large as described above), whereby: he first learns the depth of the flaw when the surface of the sheet is damaged: the right convex portion When the average diameter (r2) is less than the lower limit, the anti-adhesive function cannot be exhibited. Conversely, if the average diameter (6) exceeds the upper limit, the damage to the surface of the other optical sheets is likely to occur, and the depth of the flaw becomes ice again. The average diameter (Γ2) is observed by a laser microscope in a specific area, and is calculated by observing the average diameter of the upper part of the plurality of convex portions before the height is higher. The height of the convex portion (h) 5% (〇〇5h) cuts the diameter of the obtained cross-section, and the average value of each is based on the Feret diameter (when the parallel line in a certain direction is lost) Calculated by the interval. The lower limit of the height ratio (h/r2) of each convex portion of the surface of the anti-adhesive layer 4 is preferably 1/400, particularly preferably 1/2 〇〇, and particularly preferably ι/ΐ5 〇, Further preferably, it is 1/120. And the upper limit of the height ratio (h/r2) is preferably wi〇, especially Preferably, it is 1/30, and particularly preferably 1/6 G, and more preferably 1/8 (). According to the optical sheet, the height ratio (h/r2) of each convex portion on the surface of the release layer 4 is as above. As described above, the ratio of the damage of the surface of the other optical sheets is suppressed, and the size of the flaw itself when the damage is generated can be suppressed to be small. If the height ratio (h/r2) is smaller than the lower limit described above, However, if the height ratio (h/r2) exceeds the above upper limit, it is easy to cause damage on the surface of other optical sheets, and the size of the flaw itself is enlarged. 4 The convex portion of the surface has such a relatively small average height (h), a relatively small average protrusion diameter (6), a relatively large average diameter (r2), and a small height ratio (h/r2). Increasing the friction of the surface in contact with the layer. According to the optical sheet having such an anti-adhesive layer 4, the friction between the anti-adhesion layer 4 and other optical sheets or sheets in contact with the layer is enhanced, thereby Preventing slipping, as a result, suppressing the slight shift between the slices, thereby suppressing Damage to the surface of other optical sheets or cymbals. The lower limit of the density of the convex portion of the surface of the anti-adhesive layer 4 is preferably a square/face 2, particularly preferably 6 //mm 2 , and particularly preferably 8 〇 "2. Further, the upper limit of the density of the convex portion is preferably _ / bribe 2, particularly preferably 400 / face 2, and more preferably 3 (8) / position 2. If the anti-adhesive layer * surface convex If the density of the portion is less than the lower limit, the sufficient anti-adhesive function cannot be exhibited. Conversely, if the density of the convex portion is greater than the upper limit, damage to the surface of other optical sheets or the like is likely to occur. The density of existence is measured by magnifying to a magnification of a laser microscope: the number of convex portions in the field of view is calculated and calculated using the field of view. Further, the calculation of the average height (h), the average projection diameter (Μ, the flat material (five), and the convex portion in the presence of the density refers to a protrusion having a southerness of 0 2 //m or more on the surface of the anti-adhesion layer 4. 201131211 In the case of the pencil hardness of the surface of the anti-adhesive layer 4, the upper limit of the glass layer is the upper limit of the glass in the base layer 2, 敕# ac. On the other hand, the pencil hardness dicarboxylic acid B _ / ' especially good for 4H ° 'in the substrate layer 2 is the lower limit of the polyparaphenyl hardness, preferably Β, especially the wrong surface of the pen is hard; ^ purely HB. On the other hand, at this time lead two, preferably 3H 'More preferably 2H. According to the optical sheet 1, = two tables: the above shape and the wrong pen hardness is the above range, by "sticking and preventing the damage of other sheets of the laminate. If the pencil hardness is less than the above The lower limit' may be broken due to the obscuration of the front end or the like, and the result may be scratched on the surface of the light guide plate or the like. Conversely, if the pencil hardness exceeds the above upper limit, there is fine unevenness due to the higher hardness. The shape itself causes damage to the surface of the light guide plate, etc. <; a hardenable composition for forming an anti-adhesive layer; - the anti-adhesive layer 4 can be hardened by coating three components each independently containing at least one selected from the group consisting of a polymer, an oligomer, and a monomer. The composition is formed by hardening the composition, and the curable composition is applied and cured by the curable composition, whereby the substrate phase, the domain phase, and the granular phase are formed from the three components contained therein. The anti-adhesive layer having the double island structure described above is formed. The formation of such a double island structure can be caused by the difference in physical properties of the components when the curable composition is applied to the substrate layer, or In the case of hardening, it is caused by a difference in physical properties of the formed resin. Examples of the above polymer '(meth)acrylic acid polymer, polyolefin, polyether resin, polyether oxime, polystyrene, and styrene copolymerization)物,降莰201131211 olefin resin, polycarbonate, polyester, polyurethane, polyoxyalkylene, polydecane, polyamine, polyimide, melamine resin or fluororesin, etc. (methic acid polymer, can List of (meth)acrylic acid a homopolymer or a copolymer, a copolymer of a (meth)acrylic monomer and another monomer having an ethylenically unsaturated double bond, etc. The polyolefin may be exemplified by polyethylene, polypropylene, and ethylene. Ethylene-vinyl acetate copolymer, ionic polymer, ethylene, ethyl alcohol, polystyrene, ethylene-ethylene copolymer, etc. Polyether resin, polyethylene glycol oxime, poly-propanol-polybutyl Alcohol, etc. The polyglycol may be exemplified by polyethylene terephthalate, p-butyl benzoate, unsaturated polyacetate, alkyd resin, etc. Polycarbonate may be a structural unit having two or more kinds of such polymers. The copolymer may be a copolymer composed of the structural unit of the polymer and other elements. Among them, from the viewpoint of promoting the formation of irregularities and improving the viscosity of the optical sheet, it is preferred that The homopolymerization of the (meth)acrylic monomer is further preferably a copolymer of a (meth)acrylic monomer. Polymerization One type or plural types can be used. The lower limit of the weight average molecular weight of the more preferred Si compound is preferably 尺. The other Htr. is preferably 100_, more preferably the upper limit of the weight average molecular weight of ’ '5 is less than the upper _. If the weight average molecular property of the polymer decreases, the unevenness of the anti-adhesive layer formed by the reverse enthalpy becomes smaller and the upper limit of the anti-adhesion layer is formed, and the weight average molecular weight of the right polymer exceeds the damage of the optical sheet of the upper contact or the like. Hey. Further, the "polymerization of the above-mentioned polymer with the anti-adhesion layer" may be exemplified by a polymer having a low molecular weight of the above-mentioned polymer, and is preferably a repeating unit, and a knife is used for the inside. And the weight average molecular weight is 20 201131211 8,000 or less. The oligomer ' may be a copolymer having two or more structural units of the oligomers, or may be a structural unit derived from the oligomers and other than A copolymer composed of a monomer unit, and an oligomer or a plurality of kinds of the oligomer may be used. The above monomer may be used as long as it is a compound having a polymerizable functional group. An unsaturated double bond, an epoxy group or the like can be exemplified, and an unsaturated double bond is preferred. In terms of easy polymerization, it is particularly preferably a (fluorenyl) acrylonitrile group. Further, a monomer is on the surface of the anti-adhesive layer. The polyfunctional monomer is preferred in terms of the large unevenness. The polyfunctional monomer may, for example, be a (mercapto) acrylate such as a polyhydric alcohol, and specifically, i, 6 hexanediol Di(meth)acrylate, neopentyl glycol di(decyl)acrylate, Bifunctional (meth) acrylate such as ethylene glycol di(indenyl) acrylate; trishydroxypropyl propane tri(meth) acrylate, neopentyl alcohol tri(meth) acrylate, glycerol a trifunctional (mercapto) acrylic acid vinegar such as acrylic acid vinegar; a tetrafunctional (methyl) group such as neopentyl alcohol tetrakis(yl) acrylate or di-trihydroxymercaptopropane tetrakis(yl) acrylate Acrylate; penta-functional (fluorenyl) acrylate such as dipentaerythritol penta (meth) acrylate; dipentaerythritol hexa(meth) acrylate, sorbitol hexa(meth) acrylate, etc. Functional (meth) acrylate, etc. The monomer may also have a functional group other than a polymerizable functional group in the molecule, such as an amine group, an isocyanurate group, a ureido group, a carbonate group, an anthracene. An amine group, an ester group, a carboxyl group, an ether group, an imido group, an amine group, a hydroxyl group, etc. Further, the monomer may have a halogen such as fluorine or chlorine, or an atom such as ruthenium, sulfur or phosphorus. The three components preferably have functional groups that react with each other. With such a functional group, the strength of the obtained 2011 20111111 anti-adhesive layer can be improved, and the durability can be improved. For the combination of such a reaction, for example, an ethylenically unsaturated group and an ethylenically unsaturated group are mentioned. , functional hydrogen with active hydrogen (amino group, amine group, sulfonyl group, slow group, etc.): % oxy group, functional group with isocyanate group, functional group with active hydrazine and functional group with active hydrogen Base, my alcohol base and Shixi burning alcohol base stone alcohol base and epoxy group 'active methylene and propylene sulfhydryl group, 嗤 嗤 基 与 与 m m m m 嗤 嗤 嗤 嗤 嗤 嗤 嗤 嗤 嗤 就 就 就 就 就 就 就 就 就 就 就 就 就 就 就 就The functional group of the surface of the anti-adhesive layer is t, and the functional group reactive with each other is preferably a combination of an ethylenically unsaturated group and an ethylenically unsaturated group. Preferably, the three kinds of the curable composition are included. All of the components have ethylenically unsaturated groups. With A, the strength of the anti-adhesive layer is further improved, and the formation of irregularities on the anti-adhesive surface is further promoted. The ethylenically unsaturated group, i is not particularly limited, and is preferably a (meth) propylene-based base in terms of easy polymerization. The curable composition preferably contains at least a polymer component and contains at least one monomer or oligomer component from the viewpoint of promoting the formation of the double island structure and increasing the unevenness of the surface of the anti-adhesive layer. . By using such a combination as the components of the hardenable composition, the blended polymer component is effectively formed into a granular phase, and the granular phase is scattered on the surface of the release layer. The convex portion is formed, so that the optical sheet can exhibit a high anti-adhesive property. Further, since the convex portion on the surface of the release layer is formed of a resin, damage to other optical sheets or the like caused by the uneven shape can be prevented. Further, it is preferable that among the above three components, the I component is a polymer, the other component is a monomer or an oligomer, and the remaining component is a monomer or oligomer having a polar group. By making one component of the curable composition a monomer or a merging agent having 22 201131211, it is possible to promote phase separation of the substrate phase and the domain phase, thereby forming irregularities more efficiently, and thus obtaining The anti-adhesive of the optical sheet] In the case where the curable composition has such a component, the double island structure is formed in which a monomer or oligomer is hardened by dispersing a monomer or a polymer formed by hardening a monomer having a polar group. In the dispersion layer, there is a granular phase in which the polymer is hardened. Thereby, the formed unevenness becomes A, and the obtained optical sheet is enhanced in anti-stick property. The polar group is not particularly limited as long as it is an organic group which is polarized by an atom such as oxygen, nitrogen, sulfur or sulfonate. For example, an amine group, a diisocyanate group or a urea group may be mentioned. And a carbonate group, a guanamine group, an ester group, a carboxyl group, an acid anhydride group, an ether group, an epoxy group, an imido group or an amine group. Among them, it is easy to form the above-mentioned double island structure, and the surface of the anti-adhesion layer becomes large, and the anti-adhesive property of the optical sheet is preferably an amine ester group or a trimeric isocyanate group. Specific examples of the monomer or oligomer having a polar group include (meth)acrylic acid amine vinegar, epoxy (mercapto) acryl vinegar, and polyester (mercapto) acrylate. Among them, it is easy to form the above-described double island structure, and the unevenness of the surface of the anti-adhesion layer is large, and the anti-adhesive property of the optical sheet is enhanced, and it is particularly preferable to use (meth)propionamide. The (meth)acrylic acid amide is a monomer or oligomer having one molecule of two functional groups having an amine group (-N-C0-0-) and a (meth) acryl group. The (meth)acrylic acid amide can be obtained, for example, by reacting a polyfunctional isocyanate, a compound having an active hydrogen such as a (meth) acryloyl group and a hydroxyl group or an amine group, and optionally a polyol. Polyfunctional isocyanates, for example, 23 201131211 2, 2, 2, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 Xylylene diisocyanate, hydrogenated xylene diisocyanate, isophorone diisocyanate, isocyanate diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, cyclohexyl Methane diisocyanate, methylcyclohexene diisocyanate, isopropylidene bis(4-cyclohexyl isocyanate), hexamethylene diisocyanate, and the like. Further, a modified product such as a polyurea isocyanate or a dimeric isocyanate-containing poly-isomer isocyanate trimer may be used. Examples of the compound having a (fluorenyl) acrylonitrile group and an active hydrogen include a hydroxyalkyl (meth) acrylate such as 2-hydroxyethyl (meth)acrylate; and ethylene glycol mono(meth)acrylic acid. S曰' propanol mono(meth)acrylic acid S, diethylene glycol mono(meth)acrylate, dipropylene glycol mono(indenyl)acrylate, polyethylene glycol mono(methyl)acrylic acid S A polyalkylene glycol (meth) acrylate such as fluorene or a polypropylene mono(decyl) acrylate; a caprolactone modified hydroxy (meth) acrylate or the like. As the polyol to be used, ethylene glycol, propylene glycol, i, 6-hexanediol, diethylene glycol, diethylene glycol, 1,4-butanediol, 1,8-octanediol, 19_polyglycol diol such as decanediol, hydrazine, 1 〇 癸 diol or 1,4-cyclohexane diol. Specific examples of the (mercapto) acrylamide esters include, for example, a reaction product of diphenyl decane diisocyanine S hydrazine with ethylene glycol mono(decyl) acrylate, isophorone diisocyanate and (fluorenyl) Reaction of 2-hydroxyethyl acrylate, reaction of dimeric isocyanate modified hexamethylene diisocyanate with polyethylene glycol mono(meth) acrylate, trimer isocyanate of hexamethylene diisocyanate The modified body and the poly(S)-modified S-hydrazine (mercapto) acrylic acid by acetal reaction, iso-cyanuric acid ring 24 201131211 Oxygen ethane modified bis(indenyl) acrylate, isophora-diisocyanate or The solubility of the three components contained in the curable composition is exemplified by the reaction product of the multimer and the pentaerythritol polyfunctional (mercapto) acrylate or the like to promote the formation of the double island structure. The parameters (Sp Hall*), the glass transition temperature (Tg) of the resin, the surface tension, and the molecular Jinshi Shiding are different. In view of promoting the formation of the double island structure, it is preferable that the difference in solubility parameter (SP value) between the three components contained in the curable composition is 〇3 or more, and further preferably 〇 4 or more. The value can be obtained, for example, by the method of Fedors. This method is described in POLYMER ENGINEERING AND SCIENCE, FEBRUARY 1974, vol. 14, Issue 2, p. 147-154. From the viewpoint of promoting the formation of the above-described double island structure, when the polymer component is contained in the hardening composition, the glass transition temperature (Tg) of the polymer component is preferably 〇. (The above ❶ by the Tg of the polymer component is 0 ° C or more, and the curable composition effectively causes the formation of the above-mentioned double island structure", so that the anti-adhesive property of the obtained optical sheet is improved. When the polymer component of two or more components is contained in the three components of the curable composition, the difference in glass transition temperature (Tg) between the polymer components is preferably 丨〇°c. More preferably, it is 2 〇 ° C or more. The blending ratio of the three components contained in the curable composition is preferably a particulate phase forming component, a domain phase forming component, and a substrate phase forming component. The mass ratio of the particulate phase forming component based on the total amount is 〇1% by mass or more and 25 201131211 ίο% by mass or less, and the mass ratio of the phase forming component is 〇 〇% by mass or more and 5 〇夤/° or less. The mass ratio of the material phase forming component is 40% by mass or more and 89.9 mass% or less. Further, the mass ratio of the particulate phase forming component is preferably 〇·1 mass% or more and 5% by mass or less, and the mass ratio of the domain phase forming component is 12% by mass or more and 50% by mass The mass ratio of the base phase forming component is from 49.9% by mass to 87.9% by mass. Further preferably, the mass ratio of the particulate phase forming component is 〇 质量% by mass to 3% by mass, and the domain phase is formed into a knives. The mass ratio is 20% by mass or more and 5% by mass or less, and the mass ratio of the substrate phase forming component is 49.9% by mass to 799% by mass or less. By forming the hardenable composition of each phase of the anti-adhesive layer The anti-adhesive property of the optical sheet obtained by blending the three components contained in the above-mentioned range N' and forming the unevenness of the surface of the anti-adhesive layer more effectively is further improved. Further, among the above three components The composition is a monomer or an oligomer, and the other; when it is a monomer or oligomer having a polar group, the ratio of the components: ratio (mass ratio) relative to the monomer or oligomer The mass of the component is: "1. The mass of the monomer or oligomer component of the raw group is preferably i or more, and the I is preferably 1.2 or more, and more preferably 丨3 or more. The single component of the hardenable composition Two components of a body or oligomer, by setting such a blend ratio It is more effective to cause the surface contact R ^ _ knife to become larger than the surface of the anti-adhesive layer, so that the anti-adhesive property of the optical sheet is further improved. 'In terms of easy coating, the curable composition can be further Examples of the solvent include, for example, aromatic ketones such as toluene and xylene, ketones such as methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; decyl alcohol, propanol, and isopropyl alcohol. Alcohol, butanol and other alcohols; diethyl sulphide, isopropyl bond '... 26 201131211 ° Fu, 2% burning, awkward test, phenyl ether, ethylene glycol dioxime, ethyl alcohol diethyl ether, diethylene An ether such as glyceryl ether or propylene glycol monomethyl ether; an ester such as ethyl acetate, butyl acetate, isopropyl acetate or qdiol diacetate; dimercaptomethylamine, diethylformamide, N - decylamine such as methylpyrrolidone; celecoxib such as methyl stilbene, ethyl celecoxib, butyl sedum, etc.; halogenated hydrocarbon such as dioxane or chloroform. Among them, in terms of the solubility of Jing, it is preferably an aromatic hydrocarbon, a ketone, an ester, an alcohol or an ether, and particularly preferably a ketone. These solvents can be used in a plurality of types. 3 The curable composition may also contain a polymerization initiator for hardening in the case where the component has an unsaturated double bond. Such a polymerization initiator may, for example, be 2-hydroxy-2-indolyl-1-phenyl-propane-indolyl ketone, hydroxy-cyclohexyl-phenylidene ketone, 2-methyl-1-(4- Methylthiophenyl)_2_norpolinyl propane·buxone, 2,2-dimethoxy-1,2-diphenylethane_ι-ketone, 2-benzyl-2-indole A photopolymerization initiator such as Xenon 'morpholinyl phenyl"-butan-1-one; a thermal polymerization initiator such as azo or benzoyl peroxide such as azobisisobutyronitrile. Further, the curable composition may contain a curing agent, a catalyst, a photosensitizer, or the like. The optical layer 3 has a binder 5 and a light diffusing agent 6 dispersed in the binder 5. Thus, the light diffusing agent 6 is dispersed in the optical layer 3, whereby the light penetrating the optical layer 3 from the back side to the surface side can be uniformly diffused. Further, fine unevenness is formed substantially uniformly on the surface of the optical layer 3 by the light diffusing agent 6, and each of the concave portions and the convex portions of the fine uneven portions is formed in a lens shape. The optical sheet 1 exhibits an excellent light diffusing function by the action of the lens of the fine unevenness, and also has a refractive function of refracting the transmitted light toward the normal direction side and a large amount of the transmitted light to the normal direction due to the light diffusing function. Spotlighting Spotlight 27 201131211 Features. The light diffusing agent 6 is a particle having a property of diffusing light, and is roughly classified into an inorganic filler and an organic filler. As the inorganic filler, specifically, cerium oxide, aluminum hydroxide, aluminum oxide 'zinc oxide, strontium sulfide, magnesium ruthenate or the like can be used. For the specific material of the organic filler, it is possible to use a propylene glycol resin, an acrylonitrile resin, a polyamine vinegar, a polyethylene oxide, a polystyrene, a polyamide, a polypropylene gambling or the like. In the middle, it is preferably an acrylic resin having a high transparency, and particularly preferably polymethyl methacrylate (PMMA). The binder 5 is formed by die-hardening (crosslinking, etc.) the polymer composition containing the base polymer. The light diffusing agent 6 is disposed at substantially equal density on the entire surface of the base material layer 2 by the adhesive 5 . Further, in addition to the polymer composition for forming the binder 5, for example, a fine inorganic filler, a hardener, a plasticizer, a dispersant, various leveling agents, and an antistatic agent may be suitably blended. Agent, UV absorber, antioxidant, viscous modifier, lubricant, light stabilizer, etc. Next, a method of manufacturing the optical sheet 1 will be described. The method for producing the optical sheet i generally has the following steps: (a) mixing the light diffusing agent 6 in the polymer composition constituting the binder 5, thereby producing a coating liquid for an optical layer' (b) the optical layer Applying a coating liquid to the surface of the base material layer 2, thereby laminating the optical layer 3; (c) producing the above-mentioned hardenable composition for forming an anti-adhesive layer; and (d) forming the anti-adhesive layer The object is applied to the back surface of the base material layer 2 to laminate the anti-adhesion layer 4' and is cured to form a fine uneven shape on the surface. Since the optical sheet 1 has the fine shape of the above-mentioned property 28 201131211 on the entire surface of the release layer, it is possible to prevent the convex portion which is formed gently and uniformly from adhering to the light guide plate or the like which is disposed on the other surface side, and can be adhered thereto. Prevent damage to the surface of the light guide plate or the like. Further, even if the optical sheets 1 are rubbed against each other due to curling or overlapping of the optical sheets themselves, mutual damage or adhesion is prevented. Therefore, the backlight unit for a liquid crystal display device including the lamp 21, the light guide plate 22, the light diffusion sheet 25, and the cymbal sheet 24 as shown in FIG. 2(a) and having the light emitted from the lamp 21 dispersed to the surface side is guided. In the case of using the optical sheet 1 as the light diffusion sheet 25, the optical sheet is used! The good damage prevention property reduces the damage of the surface of the cymbal sheet 24, and as a result, the unevenness of brightness caused by the damage is reduced, and the quality is improved. Further, the optical sheet of the present invention is not limited to the above embodiment, and may be, for example, a tantalum sheet (refractive optical sheet), a microlens sheet, a polarizing sheet, a reflective polarizing sheet, a reflecting sheet, a phase difference sheet, and a field of view magnifying sheet. One of the other types of optical sheets has the above-mentioned anti-adhesion layer. The anti-adhesion property and the anti-adhesion property of the optical sheets of various forms can be imparted by the anti-adhesive layer laminated on one side (the opposite side of the optical layer). [Examples] Hereinafter, the present invention will be described in detail based on examples, but the present invention is not limited by the description of the examples. (Synthesis Example 1 [Synthesis of Acrylic Copolymer (A-1) Containing Unsaturated Double Bond]) Adding propylene glycol monoterpene in a 2L reaction trough equipped with a stirrer, a thermometer, a nitrogen introduction tube, a cooler, and a dropping funnel Shout 1 part by mass, and after nitrogen replacement, heat to 110 C. Next, a mixture of 50 201131211 isodecyl decyl acrylate, 50 parts by weight of mercapto propyl methacrylate and 3 parts of methyl methacrylate was simultaneously dropped at 3 hours, respectively. A mixture of 5 parts by mass of peroxidized (2-ethylhexanoic acid) tert-butyl butyl ester and 20 parts by mass of propylene glycol monomethyl ether. After the completion of the dropwise addition, the reaction was further carried out at 11 hours under TC. Thereafter, the amount of the peroxidized (2·ethylhex@文) secondary butyl S was further reduced by 1 part by mass and the propylene glycol monoterpene 5 was further dropped. After the mixture of the mass parts, the reaction was carried out at 11 (TC for 30 minutes. In the reaction mixture, '5 parts by mass of tetrabutylammonium bromide, 3 parts by mass of hydroquinone hydrazine, and propylene glycol were added. After the mixture of 2 parts by mass of the methyl ether was foamed, the mixture of 7 parts by mass of _4-hydroxybutyl ester glycidyl acrylate and 2 parts by mass of propylene glycol monoterpene ether was dropped for 1 hour. The reaction was carried out for 5 hours. In this way, an unsaturated double bond-containing acrylic copolymer (A-1) was obtained. The unsaturated double bond-containing acrylic acid copolymer (A-1) had a number average molecular weight of 6000 and a weight average molecular weight of 20000 'SP value is 9.6, and Tg is 95 ° C. (Synthesis Example 2 [Synthesis of Acrylic Acid Copolymer (A-2)]) 2L equipped with a stirrer, a thermometer, a nitrogen introduction tube, a cooler, and a dropping funnel Add 1 part by mass of propylene glycol monomethyl ether in the reaction vessel and perform nitrogen replacement. Heating to 110 C. Then, '50 parts by mass of isodecyl methacrylate, 1 part by mass of methyl methacrylate, and 3 parts by mass of methacrylic acid were simultaneously dropped in 3 hours, respectively. a mixture of 3 parts by mass of peroxidized (2-ethylhexanoic acid) tert-butyl ester and 2 parts by mass of propylene glycol. After the completion of the dropwise addition, the mixture was further carried out at 110 ° C for 3 minutes. Reaction. Acrylic copolymer (a-2) was obtained in this manner. 30 201131211 The acrylic copolymer (A-2) had a number average molecular weight of 3,000, a weight average molecular weight of 5,500, an sp value of 1 Å, and a hardness of 117. (Synthesis Example 3 [Synthesis of Acrylic Copolymer (A-3) Containing Unsaturated Double Bond]) Adding propylene glycol monoterpene to a 2 L reaction vessel equipped with a stirrer, a thermometer, a nitrogen introduction tube, a cooler, and a dropping funnel 1 part by mass of the ether, and after nitrogen substitution, it was heated to 丨1 (rc. Then, 25 parts by mass of isodecyl methacrylate, oxime methacrylate [mass part, acrylic acid] were simultaneously dropped for 3 hours. Ethylhexene S is 25 parts by mass and thioglycolic acid is 3 a mixture of the components and the mixture of 0.5 parts by mass of peroxidized (2-ethylhexanoic acid) tributyl acrylate as a polymerization initiator and 2 parts by mass of propylene glycol monomethyl ether. After that, the reaction was further carried out for 1 hour at 1 Torr. Then, the mass fraction of bis(butyl hexanoate) and 5 parts by mass of propylene glycol monohydrate were further dropped. After the mixture, it was reacted at u 〇 <3 (: 3 Torr.) 5 parts by mass of tetrabutylammonium bromide, 0.03 parts by mass of hydroquinone, and 2 mass of propylene glycol monoterpene ether were added to the reaction mixture. After the mixture of the components was mixed, the mixture of 5 parts by mass of glycidyl methacrylate and 2 parts by mass of propylene glycol monomethyl ether was added dropwise for 1 hour, and then reacted for 5 hours. In this way, an acrylic copolymer (A-3) containing an unsaturated double bond was obtained. The acrylic copolymer (A-3) having an unsaturated double bond has a number average molecular weight of 43 Å, a weight average molecular weight of 9000 Å, a SP value of HU, and a Tg of 6. (: Synthesis Example 4 [Acrylic Copolymer (a-4) Containing Unsaturated Double Bonds 31 201131211]] Adding propylene glycol monoterpene ether v shells to a 2L reaction vessel After that, it was heated to 110 ° C. Then, when 3 small trowels were used, the amount of methyl methacrylate was 0 ppm by mass, and the methyl methacrylate was ” i "" a mixture of the composition, and as a polymerization = Qi peroxidation (2-ethylhexanoic acid) third-grade butyl 0 〇 · 5 f parts and propylene glycol monobrom

20 parts by mass of the mixture. After the completion of the dropwise addition, the H was further taken for 1 hour. (: The reaction is carried out. Thereafter, a mixture of peroxidized (2·ethylhexanoic acid') trisaudine _ (M mass parts and propylene glycol monomethyl _ 5 parts by mass) is dropped, and the mixture is at 110 ° C. The mixture was reacted for 30 minutes, and a mixture of 5 parts by mass of tetrabutylammonium bromide, 3 parts by mass of hydroquinone hydrazine, and 2 parts by mass of propylene glycol monomethyl ether was added to the reaction mixture while allowing air to be emitted. The foam was mixed with a mixture of 5 parts by mass of glycidyl methacrylate and 2 parts by mass of propylene glycol monomethyl ether in an hour, and further reacted for 5 hours. In this way, an acrylic copolymer containing an unsaturated double bond was obtained. A-4) The acrylic copolymer (A4) having an unsaturated double bond has a number average molecular weight of 1,700', a weight average molecular weight of 25 Å, a sp value of 10.4, and a Tg of 121 ° C. (Synthetic Example 5 [Acrylamine Amine] Synthesis of ester (c-1)] Adding a trimer isocyanate modified hexamethylene diisocyanate to a 2L reaction vessel equipped with a mixer, thermometer and cooler (Wuta Pharmaceutical Co., Ltd. "Takenate D-1 70N" manufactured: isocyanate (-NCO) content: 20.9 mass%) 50 parts by mass, polyethylene glycol monopropyl 32 201131211 dilute acid 酉 AE-150 j "Blemmer hydroxyl value of 264 mg K 〇 H / g, epoxy" manufactured by Nippon Oil & Fat Co., Ltd. The number of repeating units in terms of hexane: 3.4) 42 mass 3: part, 2 parts by mass of dibutyltin laurate and hydroquinone alone obtained 0 to 02 parts by mass of propionate in this manner at 7 Torr. Ethyl amide (C-1). (Synthesis Example 6 [Synthesis of urethane acrylate (C-2)]) Add 1 part of toluene 5G to a 2 L reaction vessel equipped with a transfer machine, a thermometer and a cooler. Hexamethylene diisocyanate g, a modified type of trimeric isocyanuric acid ("Takenate D 170N" manufactured by Takeda Pharmaceutical Co., Ltd.) 50 parts by mass, polycaprolactone modified hydroxyethyl acrylate ( "PLACCELFA1" manufactured by Chemical Industry Co., Ltd.) 63 mass damage, 2 parts by mass of dibutyltin laurate and strontium, and hydroquinone monomethyl ether oxime 2, and reacted at 70 C for 5 hours. 63 parts by mass of a scorpion was added, and it was found that the solid content was 50% by mass of urethane amide (c _ 2 ). The number of repetitions of the caprolactone unit of each of the acrylate monomer residues in the ester (C-2) is 1. (Synthesis Example 7 [Synthesis of urethane acrylate (C-3)]) In a 2 L reaction vessel of a thermometer and a cooler, 50 parts by mass of toluene and stearyl alcohol ("NAA-46" 'hydroxyl value: 207 manufactured by Nippon Oil & Fats Co., Ltd.) were added to 4.2 parts by mass, and the temperature was raised to 40 ° C. To completely dissolve the stearyl alcohol. Then add 50 parts by mass of the modified type of trimeric isocyanate modified by hexamethylene diisocyanate ("Takenate D-170N" of Takeda Pharmaceutical Co., Ltd.), and react at 70 ° C. minute. Further, the caprolactone-modified hydroxyethyl acrylate (179% by mass of "PLACCEL FA5" manufactured by Daicel Chemical Industry Co., Ltd. 33 201131211, 0.02 parts by mass of dibutyltin laurate, and hydroquinone monoterpene ether 〇·〇2 were added. The mass fraction was reacted at 7 ° C for 3 hours. Then, 118 parts by mass of toluene was added to obtain a solid content of 50% by mass of acrylamide g (C-3). Proacetin g (c_3) The number of repetitions of the caprolactone unit of each of the acrylate monomer residues is 3. [Example 1] A binder resin blend comprising a polyester polyol as a base polymer (Toyo Textile Co., Ltd.) ) "Vylon") 1 part by mass of citric acid gel having an average particle diameter of 20 nm ("PL l" of Fuso Chemical Industry Co., Ltd.) 5 parts by mass, hardener (Nippon P〇lyUrethane) "c〇r〇nate HX") 5 parts by mass and a light stabilizer ("puvA-1033" of Otsuka Chemical Co., Ltd.) 5 parts by mass of a polymer composition, an acrylic system having an average particle diameter of 15 m Resin beads (r ΜΒχ _i 5 in the finished product industry) 'The coating liquid was applied to a transparent polyester substrate layer having a thickness of 1 μμππ by a roll coating method at 15 g/m 2 (solid content) (Toyo Textile Co., Ltd.) And hardening it to form an optical layer. Further, 0.6 parts by mass of the acrylic copolymer (Α-1) containing the unsaturated double bond of Synthesis Example 1 and as a polyfunctional unsaturated double bond A monomeric pentaerythritol triacrylate (Β-1) 41.9 parts by mass of a solution was dropped to 57 parts by mass of the amide amide (cm) containing Synthesis Example 5, and 2-methyl group as a photoinitiator 1-(4-indolethiophenyl)_2_0 phenyl phenylpropanol- ketone (rIRGACURE 9 〇 7 manufactured by Ciba-Geigy Co., Ltd.) 7 parts by mass and 1- mercapto-cyclohexyl-phenylidene ketone (Ciba- A mixture of methyl ethyl ketone I (MEK) and methyl isobutyl ketone (MIBK) prepared by Geigy's 34 201131211 "IRGACURE 184") in a solution of 3 parts by mass (mixing ratio .MEK/MIBK) In the case of the non-volatile component ratio of 50% by mass, the base phase forming component, the domain phase forming component, and the granular phase forming component are included The coating liquid of the component is applied to the back surface of the base material layer by a roll coating method at 2 g/m 2 (solid content), and is cured by UV irradiation, thereby forming an average thickness of 2 8 # m anti-adhesive layer. Thus, the optical sheet of Example 1 was obtained. [Examples 2 to 8] As described in Table 1, an acrylic copolymer as a particulate phase forming component was used in each blending amount. In the same manner as in Example 1, except that the coating liquid for forming an anti-adhesive layer was produced in the same manner as in Example 1 except that the phase-forming component and the substrate phase-forming component were used. An optical sheet of the embodiment. In Example 7, a mixing ratio (C-2/C-3) = 3/1 (mass ratio) was used, and an amide acrylate (C-2) and an amide acrylate (c_3) were used as a base phase forming component. Further, in Example 8, methyl mercaptopropyl acrylate (C-4) was used as a substrate phase forming component. [Comparative Example 1] In the case of preparing the coating liquid for forming an anti-adhesive layer in Example 1, the urethane amide (C-1) which is a component of the substrate phase formation is not promoted, and The optical sheet of Comparative Example 1 was obtained in the same manner. [Comparative Example 2] 100 parts by mass of an adhesive resin containing a polyester polyol as a base polymer ("Vyl〇n" of Toyobo Co., Ltd.), and an average particle p 35 201131211 is a stone of 20 nm. Glucoic acid ("pl-1" of Fuso Chemical Industry Co., Ltd.) 50 parts by mass, hardener (Nippon P〇lyurethane rc〇ronate HX)) 5 parts by mass and light stabilizer (Otsuka Chemical Co., Ltd.) "puvA-1033") .5 parts by mass of the polymer composition 'mixed average particle size of 5 # m of acrylic resin beads (Ji Shui Finished Products Industry Co., Ltd.) "Μ BX - 5" 1) The coating liquid was prepared by a roll coating method, and the coating liquid was applied to the back surface of the base material layer by 2 g/m 2 (solid content conversion), and was cured to form a coating liquid. An optical sheet of Comparative Example 2 in which the average thickness of the release layer was 3.0 vm was obtained in the same manner as in Example 除 except for the release layer. (Evaluation of Characteristics) Using the optical sheets of the above Examples 1 to 8 and Comparative Examples 1 and 2, the resin phase separation structure on the surface of the release layer was observed, and the arithmetic mean roughness (Ra) of the surface properties and the roughness curve elements were measured. Average length (RSm), ten-point average crude sugar (RZ), root mean square roughness (Rq), and pencil hardness, and evaluate the front brightness of the optical sheets when incorporated into the backlight unit, and the optical sheet The effect on other optical sheets (adhesion, interference fringes, 'the production of the damage). The results are shown in the following Table i. The resin phase separation structure of the surface of the release layer was observed by an electron microscope, and evaluated based on the following points. A confirms the formation of a double island structure (substrate phase-domain phase-grain phase). B' was not confirmed to form a double island structure (substrate phase-domain phase-grain phase). The "arithmetic mean roughness (Ra)" and "ten-point average 36 201131211 rough seam (Rz)" of surface properties are based on mB〇6()1_1994, "average length of rough longitude curve elements (RSm)" and "both" The square root crude sugar (Rq) is based on JIS Brain 01-2001', the cutoff value λ c is 2·5_, and the long-term yield is (1) surface, and the stylus type manufactured by Tokyo Precision Co., Ltd. is used: surface roughness measurement The measurement was performed by "SurfC0m 470 A". "Pencil hardness" is measured in accordance with JIS K5400's test method §·4. Further, regarding the front luminance when the optical sheet is incorporated in the backlight unit and the quality of the liquid crystal display device screen caused by the optical sheet, the optical sheets are actually incorporated into the end surface illumination type backlight unit (using the surface laminated on the light guide plate) (4) 稜鏡 Η 〇 〇 、 、 、 、 、 、 、 、 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 制造 正面 正面 正面 正面 正面 正面 正面 正面Produced. About the adhesion with the cymbal, will paralyze #在! - The biomechanical evaluation was carried out for 48 hours after the temperature was 4 ° C and the humidity was 90%. ◎: It is not close at all. 〇: There is also a dense part. △: It is densely sealed to some extent. X: It is firmly sealed. The generation of interference fringes was visually evaluated based on the following points. ◎: No interference fringes are produced at all 〇: If you look at the observation, you can confirm some interference fringes △: Even if you don't look at it, you can confirm the interference fringe X: The interference fringes can be clearly confirmed. Regarding the generation of damage, the optical sheet was treated with a microscope to evaluate the adhesion of the optical sheet to the heat-resistant (surface). The surface of the prism sheet H5〇5 manufactured by the company) (the back of the crotch side has a helmet and a squid 4 shell wound, according to the following viewpoints ◎: no damage was observed at all: a slight damage was observed △ : Damage X is observed: damage is clearly observed. 38 201131211 [Id Comparative Example CN (Note 1) 〇PQ I 0.54 I 326 1 CN 0.74 PQ 3207 <1 << r~H A-1 VO c5 CT \αν 20000 Bl 41.9 12.7 1 1 1 1 m 0.02 I Ο m 0.14 0.21 κ 3146 XX ◎ Example 〇〇A-1 v〇ο ν〇α\ Os 20000 Bl 41.8 12.7 C-4 I 57.6 1 〇\ 〇6 1 < 0.12 0.65 0.18 X 3202 ◎ ◎ ◎ 卜 A-1 c5 Ό ON Ch 20000 Bl 1 41.8 1 1 12.7 1 I C-2/C-3 I i 57.6 1 〇〇 0.1 0.15 (N 0.69 0.20 κ 3187 ◎ ◎ ◎ \〇A-1 ν〇ο VO Os in ON 20000 Bl 41.8 1 12.7 1 0 1 57.6 1 1 12.3 I 1 < I 0.13 I JO 0.65 I 0.17 3190 ◎ ◎ ◎ ^Ti A-4 ο 10.4 cs 2500 R—^ ώ 41.8 12.7 1 u 1 57.6 1 12.3 1 〇0.60 0.18 κ 3222 ◎ ◎ ◎ inch A-3 ν〇ο 10.1 9000 Bl 41.8 12.7 ΰ 1 57.6 1 12.3 1 < 0.12 142 0.64 0.18 K 3215 ◎ ◎ ΓΟ 1 A-2 inch ο 1-Η ο 卜 1—( 5500 Bl 41.9 12.7 1 u 57.7 12.3 only < 0.10 〇\ CN 0.56 0.15 ffi 3208 ◎ ◎ ◎ CN A-1 inch ο cK ON 1 20000 Bl 41.9丨12.7 I tH ύ —57.7 12.3 I 1 < 0.11 m cn 0.59 0.16 X 3205 ◎ ◎ ◎ A-1 ν〇ο ν〇Ον On 20000 Bl 41.9 12.7 ύ L57.7 J | 12.3 I 1 < 0.13 I r —H 0.66 0.18 ffi 3179 ◎ ◎ ◎ Component polymer blending amount (parts by mass) in the curable composition SP value Weight average molecular weight monomer or oligomer / ^ N Surface c φ! SP value monomer or oligomerization Material blending amount (parts by mass) SP value blending amount (parts by mass) Resin phase separation structure arithmetic mean roughness: Ra ( ym) s B 00 璲 electricity % AO / ^ s B ___^ Μ -f RMS Seating degree: Rq (jtzm) Pencil hardness/^N 1 o V0 Adhesive interference fringe damage Granular phase formation component phase formation component Substrate phase formation component particle 201131211 As shown in Table 1 above, it is known that Examples 1 to 8 The optical sheet has a higher front luminance when incorporated in the backlight unit, and suppresses adhesion with other optical sheets. The interference fringes, thereby reducing damage to the other surface of the optical sheet. [Examples 9 to 16] In Example 1, an acrylic copolymer (A·!) containing an unsaturated double bond as a component of a coating liquid for an anti-adhesive layer, and pentaerythritol triacrylate vinegar (B- 1) and the amount of the acrylic acid amine g (C-1) is as shown in the following Table 2, and the non-volatile component ratio of the coating liquid for an anti-adhesive layer is 60% by mass, and the formed amount is formed. The optical sheets of Examples 9 to 16 were obtained in the same manner as in Example 1 except that the average thickness of the release layer was 2/zm. [Evaluation of characteristics] With respect to all of the optical sheets of Examples 9 to 16 obtained above, the formation of a double island structure on the surface of the release layer was confirmed by the above electron microscope observation. Further, in the same manner as described above, the arithmetic mean roughness (Ra) of the surface properties, the average length (RSm) of the roughness curve elements, the ten-point average roughness (Rz), the root mean square roughness (Rq), and the pencil hardness were measured. Further, the front surface brightness when the optical sheets are incorporated in the backlight unit and the influence of the optical sheet on other optical sheets (the generation of the denseness, the generation of the interference fringes, and the damage) are evaluated based on the evaluation criteria. The average height (1), average protrusion diameter u), average diameter (Q), and presence density of each convex portion of the point surface. For the measurement of each convex portion, a laser "VK-Gang" (manufactured by KEYENCE Co., Ltd.) was used. The results are as follows: Table 2 below. < 40 201131211 cfNd Example 16 0.08 94.6 0.03 in 0.11 3.67 0.04 0.44 2.00 26.4 00 1 1 3008 < 〇 ◎ Example 15 0.12 00 92.1 0.04 vo Os 0.18 4.50 0.05 0.60 1.80 46.2 324 3060 〇〇 ◎ Example 14 0.16 10.1 89.7 0.09 238 ; 0.41 4.56 oor—^ 2.48 53.0 369 X 3104 ◎ 〇 ◎ Example 13 0.19 12.3 87.5 0.11 222 0.50 4.55 0.14 1.13 2.38 65.7 388 X 3176 ◎ ◎ ◎ Example 12 0.22 14.5 85.3 0.14 236 0.63 4.50 0.19 1.92 2.63 137.8 I- 399 a: 3221 ◎ ◎ ◎ Example 11 0.39 25.2 74.4 0.22 260 ! 1.03 4.68 0.29 2.75 3.69 1 130.4 266 X 3238 ◎ ◎ ◎ Example 10 0.70 45.5 53.8 0.17 s 0.86 5.06 0.24 2.80 99.9 k 3385 ◎ ◎ ◎ Example 9 1.23 79.9 18.9 0.06 0.32 5.33 0.09 1.25 3.25 107.6 On 00 K 3179 〇◎ ◎ Acrylic copolymer containing unsaturated double bond (A-1) Pentaerythritol triacrylate (B-1) Amino acrylate (C-1) Arithmetic mean roughness: Ra ( /zm) Average length of roughness curve: RSm ( ym) Ten point average roughness: Rz ( /nn) Ratio (Rz/Ra) Root mean square roughness: Rq ( "m) Average height: h ( //m) Average protrusion diameter: r! ( //m) Average diameter: r2 ( "m) Density (number / mm2) Pencil hardness Front brightness (cd/m2) Sexual interference fringe damage blending amount (mass parts) Surface traits convex part evaluation 201131211 According to the above table 2, gentleman wants, car - Μ ^ Ο; ..., not as follows: by changing the composition of the first school month The ratio of blending amount, 椹Η * a 叮 π needle, holding and the front brightness and damage prevention of the horse, and the surface of the anti-adhesive layer can be adjusted, and it is smashed by the other layers. #进仃设计, can push a progress & South defense tightness and so on. [Industrial Applicability] As described above, the optical sheeting unit of the present invention is composed of a backlight liquid crystal display device which is not installed by Gutian. Also applied to the transmission pattern [Simplified description of the drawings] Fig. 1 shows the mode cross-section circle 2 (a) of the optical sheet of the present invention-embodiment, which is interesting, and FIG. 2(b) shows - [Major component symbol description 1 Optical sheet 2 Substrate layer 3 Optical layer 4 Anti-adhesive layer 5 Adhesive 6 Light diffusing agent 7 Fine uneven shape 20 Backlight unit: Mode cross-sectional view of a light-diffusing sheet of an end-illuminated backlight unit. 42 201131211 21 Lights 22 Light guides 23 Optical sheets 24 Bracts 25 Light diffusers 26 Substrate layers 27 Optical layers 28 Anti-adhesive layers 29 Adhesives 30 Resin beads 31 Adhesives 32 Beads

Claims (1)

201131211 VII. Patent application scope: 1. An optical sheet comprising a transparent substrate layer, an optical layer laminated on one side of the substrate layer, and an anti-adhesive layer laminated on the other side of the substrate layer, and The entire surface of the anti-adhesive layer has a fine concavo-convex shape, and the anti-adhesive layer is composed of a plurality of phase-separated resins, and has a domain phase (d〇main phase) and a domain phase dispersed in a matrix phase. A double island structure in which a granular phase is dispersed. 2. The optical sheet of the third aspect of the patent application, wherein the main material of the substrate phase of the anti-adhesive layer is (urethane (meth)acrylate) resin, and the main material of the domain phase is ( Methyl) acrylic resin, the main material of the granular phase is (meth)acrylic resin. 3. The optical sheet of claim 3, wherein a convex portion is formed on the surface of the anti-adhesive layer by a dispersed granular phase. 4. The optical sheet of claim 3, wherein the anti-adhesive layer has an average thickness of 0.5//m or more and 4//m or less, and an arithmetic mean roughness (Ra) of the surface of the anti-adhesive layer is 〇. 〇3# above 0.3 // m, the average length (RSm) of the roughness curve element (e〇ughness curve eiement) is 40 m or more and 400 lm or less. A backlight unit for a liquid crystal display device which disperses and emits light emitted from a lamp to a surface side, and the backlight unit for a liquid crystal display device has an optical month of the first application of the patent range. ,