WO2020217590A1 - エッジライト型導光板及びエッジライト型面光源ユニット - Google Patents

エッジライト型導光板及びエッジライト型面光源ユニット Download PDF

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Publication number
WO2020217590A1
WO2020217590A1 PCT/JP2019/050667 JP2019050667W WO2020217590A1 WO 2020217590 A1 WO2020217590 A1 WO 2020217590A1 JP 2019050667 W JP2019050667 W JP 2019050667W WO 2020217590 A1 WO2020217590 A1 WO 2020217590A1
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Prior art keywords
guide plate
light guide
tert
edge
butyl
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/JP2019/050667
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English (en)
French (fr)
Japanese (ja)
Inventor
山口　泰生
佐藤　誠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denka Co Ltd
Toyo Styrene Co Ltd
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Denka Co Ltd
Toyo Styrene Co Ltd
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Application filed by Denka Co Ltd, Toyo Styrene Co Ltd filed Critical Denka Co Ltd
Priority to SG11202111615VA priority Critical patent/SG11202111615VA/en
Priority to CN201980095817.2A priority patent/CN113748375B/zh
Priority to KR1020217038108A priority patent/KR102754454B1/ko
Priority to JP2021515783A priority patent/JP7344961B2/ja
Publication of WO2020217590A1 publication Critical patent/WO2020217590A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K15/00—Anti-oxidant compositions; Compositions inhibiting chemical change
    • C09K15/04—Anti-oxidant compositions; Compositions inhibiting chemical change containing organic compounds
    • C09K15/06—Anti-oxidant compositions; Compositions inhibiting chemical change containing organic compounds containing oxygen
    • C09K15/08—Anti-oxidant compositions; Compositions inhibiting chemical change containing organic compounds containing oxygen containing a phenol or quinone moiety
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K15/00—Anti-oxidant compositions; Compositions inhibiting chemical change
    • C09K15/04—Anti-oxidant compositions; Compositions inhibiting chemical change containing organic compounds
    • C09K15/32—Anti-oxidant compositions; Compositions inhibiting chemical change containing organic compounds containing two or more of boron, silicon, phosphorus, selenium, tellurium or a metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings

Definitions

  • the present invention relates to an edge light type light guide plate and an edge light type surface light source unit.
  • the backlight of the liquid crystal display includes a direct type backlight in which the light source is arranged in front of the display device and an edge light type backlight in which the light source is arranged on the side surface.
  • the light guide plate is incorporated in the edge light type backlight and plays a role of guiding the light from the side to the liquid crystal panel, and is used in a wide range of applications such as TVs, desktop personal computer monitors, notebook personal computers, mobile phones, and car navigation systems. To. A backlight using a light guide plate is also used for lighting.
  • the light guide plate receives light from the end surface (side surface) of the plate-shaped molded product, and guides the light to the front surface (light emitting surface) of the molded product by a reflection pattern formed on the rear surface (non-light emitting surface) of the molded product. It is a member that has the function of emitting surface light.
  • the light guide plate tends to be large and thin, and in order to improve the uniformity of the emitted light, it has become an industrial mainstream to provide a prism pattern or the like on the front surface (light emitting surface) of the plate-shaped molded product.
  • the pattern on the front surface or the rear surface of the plate-shaped molded product can be formed at the time of molding the plate-shaped molded product.
  • the pattern can be formed by a mold shape in injection molding, roll transfer in extrusion molding, or the like.
  • the formability of the pattern is a major issue.
  • the pattern can be formed by roll transfer in extrusion molding, but problems occur in molding such as generation of eye tar and poor transferability and releasability. It has been difficult to easily manufacture a light guide plate that gives uniform brightness.
  • the pattern forming is insufficient, there is a problem that not only the optical characteristics are inferior, but also the strength is low in combination with the thinning, and the light guide plate cannot be put into practical use.
  • the present invention has been made in view of such a problem, and is an edge light type guide that can be easily manufactured because it has excellent brightness uniformity and excellent moldability in light guide plate manufacturing by extrusion molding and roll transfer.
  • the present invention provides an optical plate and an edge light type surface light source unit using the light guide plate.
  • an edge light type light guide plate containing a styrene resin composition which has a plurality of lenticular-shaped and / or prism-shaped convex portions on the surface of the light guide plate, and has a thickness T of the light guide plate.
  • the styrene resin composition is 1.0 to 3.0 mm, and the styrene resin composition contains a styrene resin and a phosphorus-based antioxidant (A) and / or a phenol-based antioxidant (B). Satisfy at least one of (1) and (2) of (1) An edge light type light guide plate having a height H of the convex portion of 10 to 500 ⁇ m and (2) a pitch P of the convex portion of 30 to 800 ⁇ m is provided.
  • an edge light type light guide plate containing a styrene resin composition has a plurality of lenticular and / or prism-shaped convex portions of a predetermined pattern on the surface of the light guide plate.
  • the thickness of the styrene resin composition is within a predetermined range and the styrene resin composition contains a specific antioxidant, the edge light type light guide plate that can be easily manufactured because of excellent brightness uniformity and moldability. It was found that the present invention was completed.
  • the height H of the convex portion is 10 to 500 ⁇ m
  • the pitch P of the convex portion is 30 to 800 ⁇ m.
  • 0.001 to 0.5 parts by mass of the phosphorus-based antioxidant (A) and 0.001 to 0 parts of the phenol-based antioxidant (B) are made with respect to 100 parts by mass of the styrene resin composition. Contains 5 parts by mass.
  • the phosphorus-based antioxidant (A) is 2,2'-methylenebis (4,6-di-tert-butyl-1-phenyloxy) (2-ethylhexyloxy) phosphorus, tris (2,4-).
  • Di-tert-butylphenyl) phosphite 3,9-bis (2,6-di-tert-butyl-4-methylphenoxy) -2,4,8,10-tetraoxa-3,9-diphosphaspiro [5, 5]
  • Undecane tetrakis (2,4-di-tert-butylphenyl) [1,1 biphenyl] -4,4 diylbiphosphonite, bis (2,4-di-tert-butyl-6-methylphenyl) ethyl At least one selected from phosphite.
  • the phenolic antioxidant (B) is 6- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propoxy] -2,4,8,10-tetra-tert-.
  • the styrene resin has a weight average molecular weight (Mw) of 200,000 to 400,000 and a ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of 1.0 to 3.0.
  • the styrene-based resin composition has an average transmittance of 80% or more at a wavelength of 380 to 780 nm at an initial optical path length of 115 mm.
  • an edge light type surface light source unit having the edge light type light guide plate and a light source for supplying light to the end surface of the edge light light guide plate.
  • FIG. 1A is a perspective view when the convex portion has a lenticular shape
  • FIG. 1B is a perspective view when the convex portion has a prism shape.
  • FIG. 2A is a cross-sectional view when the convex portion has a lenticular shape
  • FIG. 2B is a cross-sectional view when the convex portion has a prism shape. It is the schematic which shows an example of the manufacturing method of the light guide plate of this invention.
  • the edge light type light guide plate of the present invention has an uneven shape on the surface of the light guide plate. More specifically, as shown in FIG. 1, the surface of the light guide plate 1 has a plurality of lenticular-shaped (FIG. 1A) and / or prism-shaped (FIG. 1B) convex portions 3.
  • the convex portion is preferably provided on at least one surface of the light guide plate, and particularly needs to be provided on one surface which is the front surface (light emitting surface) of the light guide plate. Other surfaces may be provided if necessary, but it is more preferable that the other surfaces are provided only on the front surface (light emitting surface) of the light guide plate.
  • the lenticular-shaped convex portion is an arc-shaped convex portion 3A as shown in FIG. 1A
  • the edge shape of the cross section is an arc-shaped ridge (FIG. 2A).
  • the prism shape is an arc-shaped convex portion 3B as shown in FIG. 1B
  • the edge shape of the cross section is a triangular chevron-shaped ridge (FIG. 2B).
  • the convex portions are formed so as to have a plurality of rows and a parallel relationship with each other (Fig. 1). Further, it is preferable that the convex portion is integrally formed with the light guide plate.
  • the plurality of convex portions on the surface of the light guide plate is not limited as long as a plurality of convex portions are formed, but it is preferably a periodic pattern.
  • the pitch P of the convex portion is preferably 30 to 800 ⁇ m, more preferably 100 to 600 ⁇ m, and further preferably 200 to 400 ⁇ m. Within such a range, a light guide plate having sufficient strength is produced with excellent extrusion stability, roll transferability, and roll releasability in molding of a styrene resin composition to which an antioxidant is added. Is easy.
  • the pitch P of the convex portion is, for example, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650. , 700, 750, 800 ⁇ m, and may be within the range between any two of the numerical values exemplified here.
  • the pitch P of the convex portion is an average value of the distances between the vertices of the adjacent convex portions, as shown in FIG. In a specific example, it is the average value of the distances between the vertices of adjacent convex portions for 100 consecutive convex portions in an arbitrary range.
  • the height H of the convex portion is preferably 10 to 500 ⁇ m, more preferably 50 to 300 ⁇ m, and further preferably 90 to 200 ⁇ m. Within such a range, a light guide plate having sufficient strength is produced with excellent extrusion stability, roll transferability, and roll releasability in molding of a styrene resin composition to which an antioxidant is added. Is easy.
  • the height H of the convex portion is, for example, 10, 20, 21, 25, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, 300, 350, 400, It is 450, 500 ⁇ m, and may be within the range between any two of the numerical values exemplified here.
  • the height H of the convex portion is, as shown in FIG. 2, the average value of the difference between the lowest portion and the highest portion of the convex portion. In a specific example, it is the average value of the difference between the lowest portion and the highest portion of the convex portion for 100 consecutive convex portions in an arbitrary range.
  • the width W of the convex portion is preferably 30 to 800 ⁇ m, more preferably 100 to 600 ⁇ m, and further preferably 200 to 400 ⁇ m. Within such a range, a light guide plate having sufficient strength is produced with excellent extrusion stability, roll transferability, and roll releasability in molding of a styrene resin composition to which an antioxidant is added. Is easy.
  • the width W of the convex portion is, for example, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650. , 700, 750, 800 ⁇ m, and may be within the range between any two of the numerical values exemplified here.
  • the width W of the convex portion is an average value of the distances between the lowest portions of the convex portion, as shown in FIG. In a specific example, it is the average value of the distances between the lowest points of the convex portions for 100 consecutive convex portions in an arbitrary range.
  • the ratio (H / P) of the height H of the convex portion to the pitch P is preferably 0.1 to 1.0, more preferably 0.26 to 0.7, and further preferably 0.3 to 0.3. It is 0.5. Within such a range, a light guide plate having sufficient strength is produced with excellent extrusion stability, roll transferability, and roll releasability in molding of a styrene resin composition to which an antioxidant is added. Is easy.
  • the ratio (H / P) is, for example, 0.10, 0.15, 0.20, 0.25, 0.26, 0.30, 0.31, 0.32, 0.33, It is 0.34, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.66, 0.67, 0.68, 0.70. It may be within the range between any two of the numerical values exemplified here.
  • the thickness T of the light guide plate is 1.0 to 3.0 mm, preferably 1.5 to 2.5 mm, and more preferably 1.6 to 2.4 mm. Within such a range, a light guide plate having sufficient strength is produced with excellent extrusion stability, roll transferability, and roll releasability in molding of a styrene resin composition to which an antioxidant is added. Is easy.
  • the thickness T of the light guide plate is, for example, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1 9.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0 mm, here It may be within the range between any two of the numerical values exemplified in 1.
  • the edge light type light guide plate of the present invention is an edge light type light guide plate containing a styrene resin composition. That is, it is a molded product made of a styrene resin composition.
  • the styrene-based resin composition contains a styrene-based resin and a phosphorus-based antioxidant (A) and / or a phenol-based antioxidant (B).
  • the styrene resin can be obtained by polymerizing a styrene monomer.
  • the styrene-based monomer is a single aromatic vinyl-based monomer such as styrene, ⁇ -methylstyrene, o-methylstyrene, p-methylstyrene, m-methylstyrene, ethylstyrene, and pt-butylstyrene. Alternatively, it is a mixture of two or more kinds, preferably styrene.
  • styrene-based resin is preferably substantially composed of only the styrene-based monomer, and more preferably a homopolymer of the styrene-based monomer.
  • the styrene-based resin composition is preferably composed of a styrene-based resin and various additives, and the styrene-based resin is, for example, 90 to 99.998 parts by mass with respect to 100 parts by mass of the styrene-based resin composition. , 95 to 99.98 parts by mass is preferable. Specifically, for example, the ratio of the styrene resin is 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 99.1, 99 with respect to 100 parts by mass of the styrene resin composition.
  • Examples of the polymerization method of the styrene resin include known styrene polymerization methods such as a massive polymerization method, a solution polymerization method, a suspension polymerization method, and an emulsion polymerization method. From the viewpoint of quality and productivity, the bulk polymerization method and the solution polymerization method are preferable, and continuous polymerization is preferable.
  • the solvent for example, alkylbenzenes such as benzene, toluene, ethylbenzene and xylene, ketones such as acetone and methyl ethyl ketone, and aliphatic hydrocarbons such as hexane and cyclohexane can be used.
  • a polymerization initiator and a chain transfer agent can be used as needed.
  • a radical polymerization initiator is preferable, and for example, known and commonly used 1,1-di (t-butylperoxy) cyclohexane, 2,2-di (t-butylperoxy) butane, 2,2- Peroxyketals such as di (4,5-di-t-butylperoxycyclohexyl) propane, 1,1-di (t-amylperoxy) cyclohexane, cumenehydroperoxide, t-butylhydroperoxide and the like.
  • alkyl peroxides such as t-butylperoxyacetate, t-amylperoxyisononanoate, t-butylcumyl peroxide, di-t-butyl peroxide, dicumyl peroxide, di-t -Dialkyl peroxides such as hexyl peroxide, peroxyesters such as t-butyl peroxyacetate, t-butyl peroxybenzoate, t-butyl peroxyisopropyl monocarbonate, t-butyl peroxyisopropyl carbonate, polyether Peroxycarbonates such as tetrakis (t-butylperoxycarbonate), N, N'-azobis (cyclohexane-1-carbonitrile), N, N'-azobis (2-methylbutyronitrile), N, N' -Azobis (2,4-dimethylvaleronitrile), N, N'-azobis [2- (hydroxymethyl)
  • 4-t-Butylcatechol (TBC) is often used as the polymerization inhibitor of the styrene-based monomer used for the polymerization of the styrene-based resin, and 4-t- in the styrene-based resin composition. A small amount of butylcatechol may remain. Since 4-t-butylcatechol itself becomes a coloring component and reduces hue and transmittance, it is preferable that 4-t-butylcatechol is not contained in the styrene resin composition as much as possible, but it should be completely removed. Is difficult.
  • the preferred range of 4-t-butylcatechol is 0.001 to 10 ⁇ g / g, more preferably 0.01 to 8 ⁇ g / g, and particularly preferably 0.1 to 6 ⁇ g / g.
  • the polymerization reaction is controlled by adjusting the polymerization temperature or the like so as to obtain the target molecular weight, molecular weight distribution, and reaction conversion rate by using a complete mixing tank type stirring tank or a column reactor known in the polymerization step. Will be done.
  • the polymerization solution containing the polymer that has left the polymerization step is transferred to the devolatile step, and the unreacted monomer and the polymerization solvent are removed.
  • the volatilization process consists of a vacuum devolatilization tank with a heater and a devolatilization extruder with a vent.
  • the molten polymer that has left the devolatile step is transferred to the granulation step.
  • the molten resin is extruded into a strand shape from a porous die and processed into a pellet shape by a cold cut method, an aerial hot cut method, or an underwater hot cut method.
  • the weight average molecular weight (Mw) of the styrene resin is preferably 200,000 to 400,000, more preferably 220,000 to 380,000, and further preferably 250,000 to 300,000. By setting it in such a range, both moldability and strength of the light guide plate can be achieved. If it is less than 200,000, the strength of the molded product becomes insufficient, and if it exceeds 400,000, the moldability is significantly lowered.
  • the weight average molecular weight (Mw) of the styrene resin is, for example, 200,000, 210,000, 220,000, 230,000, 240,000, 250,000, 260,000, 270,000, 280,000, 290,000, 300,000.
  • the weight average molecular weight of the styrene resin should be controlled by the reaction temperature, residence time, type and addition amount of polymerization initiator, type and addition amount of chain transfer agent, type and amount of solvent used during polymerization, etc. in the polymerization step. Can be done.
  • the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the styrene resin is preferably 1.0 to 3.0, more preferably 1.2 to 2.8. , More preferably 1.5 to 2.5. Within such a range, a light guide plate having sufficient strength is produced with excellent extrusion stability, roll transferability, and roll releasability in molding of a styrene resin composition to which an antioxidant is added. Is easy.
  • the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the styrene resin is, for example, 1.0, 1.1, 1.2, 1.3, 1. 4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, It is 2.7, 2.8, 2.9, and 3.0, and may be within the range between any two of the numerical values exemplified here.
  • the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the styrene resin is the reaction temperature, residence time, type and addition amount of the polymerization initiator, type of chain transfer agent, and the chain transfer agent. It can be controlled by the amount of addition, the type and amount of the solvent used at the time of polymerization, and the like.
  • the styrene-based resin composition may contain either a phosphorus-based antioxidant (A) or a phenol-based antioxidant (B), but by using both in combination, higher moldability and strength can be obtained. can get.
  • the phosphorus-based antioxidant (A) is preferably contained in an amount of 0.001 to 0.5 parts by mass, preferably 0.01 to 0.4 parts by mass, based on 100 parts by mass of the styrene resin composition. It is preferably contained in an amount of 0.05 to 0.3 parts by mass, more preferably.
  • the phenolic antioxidant (B) is preferably contained in an amount of 0.001 to 0.5 parts by mass, preferably 0.01 to 0.3 parts by mass, based on 100 parts by mass of the styrene resin composition. It is preferable, and it is more preferable to contain 0.05 to 0.2 parts by mass. Within such a range, moldability and strength are excellent.
  • the contents of the phosphorus-based antioxidant (A) and the phenol-based antioxidant (B) with respect to 100 parts by mass of the styrene-based resin composition are, for example, 0.001, 0.005, and 0. 01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.15, 0.25, 0.25, It is 0.30, 0.35, 0.40, 0.45, 0.50 parts by mass, and may be within the range between any two of the numerical values exemplified here.
  • the phosphorus antioxidant (A) is, for example, 2,2'-methylenebis (4,6-di-tert-butyl-1-phenyloxy) (2-ethylhexyloxy) phosphorus, tris (2,4-di-).
  • tert-Butylphenyl) phosphite 3,9-bis (2,6-di-tert-butyl-4-methylphenoxy) -2,4,8,10-tetraoxa-3,9-diphosphaspiro [5,5]
  • Undecane tetrakis (2,4-di-tert-butylphenyl) [1,1 biphenyl] -4,4 diylbiphosphonite, bis (2,4-di-tert-butyl-6-methylphenyl) ethyl subphosphorus At least one selected from acid esters.
  • the phenolic antioxidant (B) is, for example, 6- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propoxy] -2,4,8,10-tetra-tert-butyldibenzo.
  • [D, f] [1,3,2] dioxaphosphepine, octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, ethylenebis (oxyethylene) bis [3- (5-tert-Butyl-4-hydroxy-m-tolyl) propionate], pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 3,9-bis [2 -[3- (3-tert-Butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1,1-dimethylethyl] -2,4,8,10-tetraox
  • a phosphorus-based-phenolic compound when 0.1 parts by mass of a phosphorus-based-phenolic compound is contained, 0.1 parts by mass of a phosphorus-based antioxidant and a phenol-based antioxidant are added to 100 parts by mass of the styrene resin composition. It is considered to contain 0.1 parts by mass.
  • Examples of the method for adding the phosphorus-based antioxidant (A), the phenol-based antioxidant (B), and other additives include a method of adding and mixing in a styrene resin polymerization step, a volatilization step, and a granulation step, and molding.
  • Examples thereof include a method of diluting and mixing the desired content, and the present invention is not particularly limited.
  • the styrene resin composition contains a sulfur-based antioxidant, a lactone-based antioxidant, an ultraviolet absorber, a hindered amine-based stabilizer, an antistatic agent, a hydrophilic additive, and liquid paraffin (as long as the effects of the present invention are not impaired. It can contain various additives such as mineral oil), polyethylene wax, microcrystalline wax, and brewing agent.
  • the styrene resin composition contains higher fatty acids such as lauric acid, myristic acid, palmitic acid and stearic acid, stearic acid amide, erucic acid amide, ethylene bisstearic acid amide and the like as additives as long as the effects of the present invention are not impaired.
  • a mold release agent such as a higher fatty acid amide, myristic alcohol, cetyl alcohol, stearic acid or the like may be contained, but it is preferable not to contain more than necessary because it may deteriorate the permeability.
  • the content of the release agent is preferably 500 ppm or less, more preferably 200 ppm or less, and further preferably 100 ppm or less in the styrene resin composition. From the viewpoint of obtaining a high transmittance, it is preferable that the styrene resin composition does not substantially contain a release agent.
  • the Vicat softening temperature of the styrene resin composition is preferably 95 to 104 ° C, more preferably 97 to 104 ° C. If the Vicat softening temperature is less than 95 ° C., the heat resistance is insufficient, and the light guide plate may be deformed depending on the usage environment.
  • the degree of fogging of the styrene resin composition is preferably 5% or less, more preferably 1% or less in a molded product having a thickness of 4 mm.
  • the average transmittance of the styrene resin composition at an initial optical path length of 115 mm and a wavelength of 380 to 780 nm is preferably 80% or more, more preferably 84% or more.
  • the average transmittance of the styrene resin composition at a wavelength of 380 to 780 nm at an optical path length of 115 mm after a long-term durability test is preferably 80% or more, more preferably 83% or more.
  • the initial YI value of the styrene resin composition is preferably 7.0 or less, more preferably 6.0 or less.
  • the difference ( ⁇ YI) between the initial YI value and the YI value after the long-term durability test is preferably 3.0 or less, more preferably 2.0 or less, and further preferably 1.5 or less. Is.
  • the total light transmittance and YI value were measured by the following procedure. Using pellets of the styrene resin composition, injection molding was performed at a cylinder temperature of 230 ° C. and a mold temperature of 50 ° C. to form a plate-shaped molded product having a thickness of 127 ⁇ 127 ⁇ 3 mm. Here, the sample for which the long-term durability is evaluated (the sample after the long-term durability test) was stored in an oven at 80 ° C. for 1000 hours. Next, a test piece having a thickness of 115 ⁇ 85 ⁇ 3 mm was cut out from the plate-shaped molded product, and the end face was polished by buffing to prepare a plate-shaped molded product having a mirror surface on the end face.
  • the wavelength at an optical path length of 115 mm in incident light having a size of 20 ⁇ 1.6 mm and a spreading angle of 0 °.
  • the spectral transmittance of 350 nm to 800 nm was measured, and the YI value at a field of view of 2 ° in the C light source was calculated according to JIS K7105.
  • the average transmittance at a wavelength of 380 nm to 780 nm is the total light transmittance.
  • the edge light type light guide plate of the present invention is obtained by molding the above-mentioned styrene resin composition, and as a molding method, known methods such as sheet extrusion molding, injection molding, and compression molding can be used. In terms of productivity and easy upsizing of molded products, continuous sheet extrusion molding provided with a surface shape transfer mold is preferable.
  • the sheet extrusion molding include an extrusion step of supplying a resin in a heated and melted state to a feed block to continuously create an extrusion sheet from a die, and a pressing step of sandwiching the resin sheet between a pressure-bonding roll and a cooling roll.
  • a continuous sheet extrusion molding method having a transport step of transporting the resin sheet while being in close contact with the cooling roll and having a transfer mold on the surface of the cooling roll has been raised, and the shape of the transfer mold has been changed.
  • the edge light type light guide plate of the present invention has an uneven shape on the front surface (light emitting surface), but the back surface is subjected to a reflection process for diffusely reflecting light.
  • the reflection processing for example, in addition to silk printing and inkjet printing, a method of imparting dot-shaped irregularities by laser irradiation can be mentioned.
  • dot pattern printing ink having fine particles that diffuse light can be used. it can.
  • Edge light type surface light source unit of the present invention is an edge light type surface light source unit having an edge light type light guide plate and a light source that supplies light to the end surface of the light guide plate.
  • the edge light type surface light source unit of the present invention is suitably used as a surface light source device for a liquid crystal display device.
  • the conditions shown in Table 1 are formed by connecting the first reactor, which is a complete mixing type stirring tank, the second reactor, and the third reactor, which is a plug-flow type reactor with a static mixer, in series to form a polymerization process.
  • a styrene-based resin was produced.
  • the capacity of each reactor was 39 liters for the first reactor, 39 liters for the second reactor, and 16 liters for the third reactor.
  • a raw material solution was prepared with the raw material composition shown in Table 1, and the raw material solution was continuously supplied to the first reactor at the flow rate shown in Table 1.
  • the polymerization initiator was added to the raw material solution at the inlet of the first reactor so as to have the addition concentration (concentration based on the mass with respect to the raw material styrene) shown in Table 1, and uniformly mixed.
  • the polymerization initiators shown in Table 1 are as follows: Polymerization initiator-1: 2,2-di (4,5-t-butylperoxycyclohexyl) propane (Pertetra A manufactured by NOF CORPORATION was used).
  • Polymerization Initiator-2 1,1-di (t-Butyl Peroxy) Cyclohexane (Perhexa C manufactured by NOF CORPORATION was used)
  • a temperature gradient was applied along the flow direction, and the temperature was adjusted to the temperature shown in Table 1 at the intermediate portion and the outlet portion.
  • a solution containing the polymer continuously taken out from the third reactor was introduced into a vacuum devolatilization tank with a preheater composed of two stages in series, and the preheater was adjusted to the resin temperature shown in Table 1.
  • the strands are extruded into strands from a porous die, and the strands are cooled and cut by a cold cut method. It was pelletized.
  • the melt mass flow rate (MFR) was measured according to JIS K 7210 at a temperature of 200 ° C. and a load of 49 N, and the Vicat softening temperature was measured according to JIS K 7206 at a heating rate of 50 ° C./hr and a test load of 50 N.
  • the weight average molecular weight (Mw), Z average molecular weight (Mz), and number average molecular weight (Mn) were measured by gel permeation chromatography (GPC) under the following conditions.
  • GPC model Showa Denko Corporation Shodex GPC-101 Column: Polymer Laboratories PLgel 10 ⁇ m MIXED-B Mobile phase: tetrahydrofuran Sample concentration: 0.2% by mass Temperature: Oven 40 ° C, inlet 35 ° C, detector 35 ° C Detector: Differential refractometer
  • the molecular weight is calculated as the polystyrene-equivalent molecular weight by calculating the molecular weight at each elution time from the elution curve of monodisperse polystyrene.
  • the phosphorus-based antioxidant (A) and phenol-based antioxidant (B) in Tables 2 and 3 are as follows, respectively.
  • Phosphorus antioxidant (A) HP-10 2,2'-Methylenebis (4,6-di-tert-butyl-1-phenyloxy) (2-ethylhexyloxy) Phosphorus (ADEKA CORPORATION ADEKA STAB HP-10) 168: Tris (2,4-di-tert-butylphenyl) phosphite (Irgafos 168 manufactured by BASF Japan Ltd.)
  • PEP-36 3,9-bis (2,6-di-tert-butyl-4-methylphenoxy) -2,4,8,10-tetraoxa-3,9-diphosphaspiro [5.5] Undecane (Co., Ltd.) ADEKA made ADEKA STAB PEP-36)
  • P-EPQ Tetrakis (2,4-di-tert-butylphenyl) [1,1 biphenyl] -4,4 diylbiphosphonite (Hostanox P-EPQ manufactured by Clariant Co.
  • the end face was polished by buffing to prepare a plate-shaped molded product having a mirror surface on the end face.
  • the wavelength at an optical path length of 115 mm in incident light having a size of 20 ⁇ 1.6 mm and a spreading angle of 0 °.
  • the spectral transmittance of 350 nm to 800 nm was measured, and the YI value at a field of view of 2 ° in the C light source was calculated according to JIS K7105.
  • the total light transmittance shown in Tables 2 and 3 represents the average transmittance at a wavelength of 380 nm to 780 nm.
  • the sheet was extruded from a T-die 9 having a width of 1500 mm at a resin temperature of 260 ° C. via 7. Subsequently, the extruded sheet is sandwiched between the crimping roll 11 (mirror surface cooling roll) and the first cooling roll 13 (mirror surface cooling roll), transported in a state of being wound around the first cooling roll 13, and then further cooled first.
  • the resin sheet peeled off from the second cooling roll 15 is picked up by the picking roll 17. It was picked up at 2 m / min.
  • Roll transferability The roll transfer rate T was determined by the following formula, and the roll transferability was evaluated with a roll transfer rate T of 95% or more as ⁇ , 85 to 95% as ⁇ , and 85% or less as x.
  • Roll transfer rate T (%) height of convex part of resin sheet H / depth of groove part of transfer type H' ⁇ 100

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  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)
PCT/JP2019/050667 2019-04-26 2019-12-24 エッジライト型導光板及びエッジライト型面光源ユニット Ceased WO2020217590A1 (ja)

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SG11202111615VA SG11202111615VA (en) 2019-04-26 2019-12-24 Edge-light-type light guide plate and edge-light-type surface light source unit
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013094642A1 (ja) * 2011-12-20 2013-06-27 東洋スチレン株式会社 光学用スチレン系樹脂組成物、成形品および導光板
JP2014086158A (ja) * 2012-10-19 2014-05-12 Toppan Printing Co Ltd 導光板、バックライトユニット、及び画像表示装置
JP2014175057A (ja) * 2013-03-06 2014-09-22 Toppan Printing Co Ltd 導光板及びこれを用いたバックライトユニット並びに表示装置
JP2017141459A (ja) * 2012-07-13 2017-08-17 東洋スチレン株式会社 光学用スチレン系樹脂組成物、成形品および導光板

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JP2003075648A (ja) 2001-09-07 2003-03-12 Denki Kagaku Kogyo Kk 導光板
TWI417577B (zh) * 2010-11-16 2013-12-01 Chi Mei Corp Light transfer plate with light structure and light guide plate
CN108912519A (zh) * 2018-05-28 2018-11-30 重庆鑫翎创福光电科技股份有限公司 一种光学用聚苯乙烯系树脂组合物及其形成的导光板

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013094642A1 (ja) * 2011-12-20 2013-06-27 東洋スチレン株式会社 光学用スチレン系樹脂組成物、成形品および導光板
JP2017141459A (ja) * 2012-07-13 2017-08-17 東洋スチレン株式会社 光学用スチレン系樹脂組成物、成形品および導光板
JP2014086158A (ja) * 2012-10-19 2014-05-12 Toppan Printing Co Ltd 導光板、バックライトユニット、及び画像表示装置
JP2014175057A (ja) * 2013-03-06 2014-09-22 Toppan Printing Co Ltd 導光板及びこれを用いたバックライトユニット並びに表示装置

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