WO2006080798A1 - Plaque de diffusion de lumiere - Google Patents

Plaque de diffusion de lumiere Download PDF

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Publication number
WO2006080798A1
WO2006080798A1 PCT/KR2006/000279 KR2006000279W WO2006080798A1 WO 2006080798 A1 WO2006080798 A1 WO 2006080798A1 KR 2006000279 W KR2006000279 W KR 2006000279W WO 2006080798 A1 WO2006080798 A1 WO 2006080798A1
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WO
WIPO (PCT)
Prior art keywords
light
diffusion plate
resin
plate according
substrate layer
Prior art date
Application number
PCT/KR2006/000279
Other languages
English (en)
Inventor
Jun Kil Doo
Yoon Hee Cho
Hee Cheong Lee
Dong Hyun Kim
Byeong Heui Han
Tae Yong Ryu
Chung Seock Kang
Original Assignee
Kolon Ind. Inc./Kr
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from KR1020050006560A external-priority patent/KR100635152B1/ko
Priority claimed from KR1020050106266A external-priority patent/KR100635154B1/ko
Priority claimed from KR1020050106268A external-priority patent/KR100750592B1/ko
Priority claimed from KR1020050121508A external-priority patent/KR100676774B1/ko
Priority claimed from KR1020050121505A external-priority patent/KR100754412B1/ko
Priority claimed from KR1020050121504A external-priority patent/KR100781686B1/ko
Priority claimed from KR1020050121507A external-priority patent/KR100781687B1/ko
Priority claimed from KR1020050121509A external-priority patent/KR100765893B1/ko
Priority claimed from KR1020060000386A external-priority patent/KR100725827B1/ko
Priority to JP2007553031A priority Critical patent/JP4857286B2/ja
Priority to CN2006800030890A priority patent/CN101107546B/zh
Application filed by Kolon Ind. Inc./Kr filed Critical Kolon Ind. Inc./Kr
Publication of WO2006080798A1 publication Critical patent/WO2006080798A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/538—Roughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/202—LCD, i.e. liquid crystal displays
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms

Definitions

  • the present invention relates to a light-diffusion plate for use in a backlight unit of a liquid crystal display (LCD) or an illumination apparatus .
  • LCD liquid crystal display
  • ⁇ a light-diffusion plate having surface protrusions through a physical process Japanese Patent Laid- open Publication No. Hei . 4-275501
  • ⁇ a light-diffusion plate obtained by coating a transparent substrate of a polyester resin with a light-diffusion layer containing transparent resin particles Japanese Patent Laid-open Publication No . Hei . 6-59108
  • S a light-diffusion plate obtained by melt-mixing beads with a transparent resin and then extruding a mixture of beads and resin, (Japanese Patent Laid-open Publication No. Hei .
  • the light-diffusion plates of ⁇ and CD are a surface light-diffusion plate exhibiting a light-diffusing effect by the surface protrusions or coated light-diffusion layer .
  • the light-diffusion plates of (3) and ® are a light- diffusion plate having the light-diffusing component even in the substrate .
  • a light-diffusion plate prepared mainly using a methylmethacrylate resin is advantageous because it has excellent light properties, such as total luminous transmittance .
  • a multi-layer sheet including methylmethacrylate-styrene capable of decreasing absorption ability is proposed (Japanese Patent Laid-open Publication No . 2004-37483 and Korean Patent Laid-open Publication No . 2003-95262 ) .
  • the resin used essentially has insufficient light resistance, and may entail a problem of deterioration such as coloration .
  • a UV absorbent may be added.
  • improvement effects are not sufficient .
  • Another obj ect of the present invention is to provide a light-diffusion plate which can be inexpensively manufactured while maintaining high dimensional stability.
  • a further object of the present invention is to provide a light-diffusion plate which generates less of a yellowing phenomenon .
  • the present invention provides a light-diffusion plate comprising a substrate layer containing a polycarbonate resin as a base resin .
  • the present invention provides a light- diffusion plate comprising a substrate layer containing a mixture including a polycarbonate resin and a polystyrene resin as a base resin .
  • the polycarbonate resin may be selected from the group consisting of linear and branched aromatic polycarbonate homopolymers prepared by reacting dihydroxyphenol with phosgene or reacting dihydroxyphenol and a carbonate precursor .
  • the base resin may comprise a mixture including a polycarbonate resin and a polystyrene resin mixed at a weight ratio of 1 : 9-9 : 1.
  • the polycarbonate resin may have a melt index of 8 ⁇ 30 g/10min at 300°C under a load of 1.2 kg according to ASTM D1238.
  • the polystyrene resin may have a melt index of 0.5-3 g/10min at 200 0 C under a load of 5 kg according to ASTM D1238.
  • the light-diffusion plate may further comprise a surface layer formed on either or both surfaces of the substrate layer and including an acrylic resin or a styrene- acrylic copolymer resin as a base resin.
  • the acrylic resin may be a homopolymer, a copolymer, or mixtures thereof obtained from at least one monomer selected from the group consisting of methacrylic acid alkylester, acrylic acid alkylester, methacrylic acid cycloalkylester, acrylic acid cycloalkylester, methacrylic acid arylester, and acrylic acid arylester.
  • the styrene-acrylic copolymer resin may be a copolymer of at least one acrylic monomer selected from the group consisting of methacrylic acid alkylester, acrylic acid alkylester, methacrylic acid cycloalkylester, acrylic acid cycloalkylester, methacrylic acid arylester, and acrylic acid arylester and at least one styrene monomer selected from the group consisting of. styrene, ⁇ -methylstyrene, m- methylstyrene, p-methylstyrene and p-methoxystyrene .
  • the styrene-acrylic copolymer resin may be obtained by reacting the acrylic monomer with the styrene monomer at a weight ratio of 6 : 4-2 : 8.
  • the surface layer may further comprise a fluorine resin or fluorine resin particles .
  • the substrate layer or surface layer may further comprise 0.1-35 wt% of a light-diffusing agent, based on the total weight of the composition of the substrate layer or surface layer.
  • the light-diffusing agent may have a particle size of 0.2-50 ⁇ m.
  • the surface layer may have an embossed shape through protrusion of the light-diffusing agent, with a surface roughness of 1-50 ⁇ m.
  • the substrate layer or surface layer may further comprise 0.01-5 wt% of a light stabilizer, based on the total weight of the composition of the substrate layer or surface layer.
  • a light-diffusion plate comprises a substrate layer including only a polycarbonate resin or a mixture composed of a polycarbonate resin and a polystyrene resin as a base resin.
  • the polycarbonate resin has excellent impact resistance, light transmittance, cold resistance and electrical properties, and in particular has high heat resistance and absorption resistance, and thus is outstanding in dimensional stability and has a wide temperature range .
  • this resin is mainly used for optical lenses , optical disk materials, helmets, guards, covers, etc.
  • the polycarbonate resin used in the present invention is a general aromatic polycarbonate resin, which includes linear and branched carbonate homopolymers, polyester copolymers or mixtures thereof resulting from the reaction of dihydroxyphenol and phosgene or of dihydroxyphenol and a . carbonate precursor.
  • dihydroxyphenol is exemplified by 2, 2-bis ( 4-hydroxyphenyl) propane (bisphenol A) , bis ( 4-hydroxyphenyl) methane, 2, 2-bis ( 4-hydroxy-3, 5- dimethylpheny1) propane and 1, 1-bis (4-hydroxyphenyl) cyclohexane
  • carbonate precursor is exemplified by diphenylcarbonate, carbonyl halide, and diarylcarbonate .
  • the polycarbonate resin preferably has a melt index (MI) of 7-30 g/10min at 300°C under a load of 1.2 kg according to ASTM D1238.
  • the polycarbonate resin has excellent impact resistance, absorption resistance and light transmittance, it is disadvantageously expensive .
  • the polycarbonate resin may be mixed with the polystyrene resin having a similar refractive index and being relatively inexpensive, in order to reinforce stiffness of the polycarbonate resin, decrease material expense in preparation cost, and maintain and improve optical and mechanical properties .
  • the polystyrene resin used to prepare the base resin of the substrate layer is hard, colorless, transparent, inexpensive (thanks to mass production) , and has excellent electrical properties, it has been widely used for daily necessities such as kitchen utensils, writing materials, furniture, etc . , and electrochemical articles , such as large automobile molds, television cabinets, etc .
  • the polystyrene resin used in the present invention has a melt index (MI) of 0.5-3 g/10min at 200 0 C under a load of 5 kg according to ASTM D1238.
  • MI melt index
  • these resins may be melt-kneaded at 200 ⁇ 300°C, preferably 25O 0 C, and at a motor speed of 250 rpm using a twin-screw extruder having a screw diameter of 30 mm.
  • the polycarbonate resin and polystyrene resin may be mixed at a ratio of 1 : 9-9 : 1.
  • Each of these resins should be added in an amount of at least 10% to exhibit advantages of polycarbonate, for example, flexibility and dimensional stability, and advantages of polystyrene, for example, high absorption resistance and strength .
  • the light-diffusion plate of the present invention may be a single-layered light-diffusion plate composed of only the substrate layer including the above base resin, or a multi-layered light-diffusion plate composed of the substrate layer and a surface layer formed on either or both surfaces thereof.
  • the surface layer may be further formed on either or both surfaces of the substrate layer .
  • the base resin of the surface layer is not particularly limited, an acrylic resin or a styrene-acrylic copolymer resin may be used.
  • the acrylic resin is preferably a homopolymer or copolymer obtained from at least one monomer selected from the group consisting of methacrylic acid alkylester, such as methylmethacrylate, ethylmethacrylate, butylmethacrylate, 2- ethylhexylmethacrylate, etc .
  • acrylic acid alkylester such as methylacrylate, ethylacrylate, butylacrylate, etc .
  • methacrylic acid cycloalkylester such as cyclohexylmethacrylate, 2-methylcyclohexylmethacrylate, dicyclopentanylmethacrylate, etc .
  • acrylic acid cycloalkylester such as cyclohexylacrylate, 2- methylcyclohexylacrylate, etc .
  • methacrylic acid arylester such as phenylmethacrylate, benzylmethacrylate, etc .
  • acrylic acid arylester such as phenylacrylate, benzylacrylate, etc.
  • the styrene-acrylic copolymer resin is prepared using the above-mentioned resin as the acrylic monomer and styrene or substituted styrene as the styrene monomer .
  • substituted styrene include alkylstyrene, such as ⁇ - methylstyrene, halogenated styrene such as chlorosytrene, and vinyl styrene .
  • two or more styrene monomers may be used, if necessary .
  • the acrylic monomer and styrene monomer are copolymerized at a ratio of 9 : 1-1 : 9, preferably at a ratio of 6 : 4-1 : 9.
  • these monomers are preferably used in the above ratio .
  • the surface layer of the present invention may further include a fluorine resin or fluorine resin particles .
  • the fluorine resin has excellent thermal stability and electrical properties, and is superior in chemical durability, weatherability, light resistance and oxygen resistance, and in particular, has a very low water absorption rate and high heat resistance, and thus has a high service temperature of 250 ⁇ 300°C. Also, since this resin has outstanding surface friction resistance, it is presently applied to various valves, pumps, tanks, filters, pipes, cables, and computers and is widely used in the aerospace industry.
  • the fluorine resin or fluorine resin particles used in the present invention comprise at least one selected from among a tetrafluoroethylene (TFE) homopolymer, a tetrafluoroethylene and perfluoropropylether copolymer (PFA) , a tetrafluoroethylene (TFE) and hexafluoropropylene (HFP) copolymer, a tetrafluoroethylene and ethylene copolymer (ETFE) , and a vinylidenefluoride (VDF) and tetrafluoroethylene (TFE) copolymer .
  • TFE tetrafluoroethylene
  • PFA perfluoropropylether copolymer
  • HFP hexafluoropropylene copolymer
  • ETFE tetrafluoroethylene and ethylene copolymer
  • VDF vinylidenefluoride
  • TFE tetrafluoroethylene
  • the fluorine resin is preferably contained in the surface layer in an amount of 0.5-35 wt%, preferably 5-15 wt%, in consideration of dimensional stability and transmittance, based on the total composition of the surface layer .
  • the substrate layer or surface layer may further include a light-diffusing agent, which has a refractive index different from the base resin and is used to increase the diffusion rate of light .
  • a light-diffusing agent which has a refractive index different from the base resin and is used to increase the diffusion rate of light .
  • various organic and inorganic particles may be used.
  • the light-diffusing agent has a large difference in refractive index from the base resin, even though it is used in a small amount, desired light-diffusing effects may be exhibited.
  • this material should be used in a relatively larger amount .
  • examples of the organic particles include acrylic polymer particles, such as methylmethacrylate, ethylmethacrylate, isobutylmethacrylate, n-butylmethacrylate, n-butylmethylmethacrylate, acrylic acid, methacrylic acid, hydroxyethylmethacrylate, hydroxypropylmethacrylate, hydroxyethylacrylate, acrylamide, methylolacrylamide, glycidylmethacrylate, ethylacrylate, isobutylacrylate, n- butylacrylate, 2-ethylhexylacrylate polymers, or copolymers or terpolymers thereof; olefin polymer particles, such as polyethylene and polypropylene; acryl-olefin copolymer particles, multi-layered multicomponent particles obtained by forming a layer of the homopolymer, copolymer or terpolymer particles and then applying another monomer layer onto the above polymer
  • the inorganic light-diffusion particles include calcium carbonate, barium sulfate, silicon oxide, aluminum hydroxide, titanium oxide, zirconium oxide, magnesium fluoride, talc, glass, mica, etc. Commonly, the organic particles have superior light-diffusibility to inorganic particles . Also, at least two kinds of light- diffusion particles may be mixed, if necessary.
  • the light-diffusing agent When the light-diffusing agent is further included in the surface layer, light-diffusing effects may be more increased. As well, the light-diffusion particles protrude from -'the surface of the surface layer such that they are embossed, thereby exhibiting a non-glossy surface and low reflectivity.
  • the surface layer preferably has a surface roughness of about 0.1-50 ⁇ m. If the roughness exceeds 50 ⁇ m, surface impact strength becomes insufficient . On the other hand, if the roughness is less than 0.1 ⁇ m, non- glossy effects are deteriorated.
  • the light-diffusing agent is contained in the substrate layer or surface layer of the present invention in an amount of 0.01-35 wt%, preferably 0.5-15 wt%, based on the total weight of the composition of the base resin of the substrate layer or surface layer.
  • amount of light- diffusing agent is less than 0.01 wt%, it is difficult to expect sufficient light-diffusing effects and masking effects .
  • the above amount exceeds 35 wt%, light transmittance becomes bad.
  • the amount of light-diffusing agent may be determined depending on the difference in refractive index from the base resin.
  • the substrate layer or surface layer may further include a light stabilizer .
  • the light stabilizer include a UV absorbent having a maximum absorption wavelength of 250-380 run, or a radical scavenger such as a hindered amine UV stabilizer capable of maximizing a light stabilizing effect . This component should exhibit such effect for a long period of time, and should not be separated or removed from the sheet due to evaporation or extraction.
  • An absorbent having high compatibility with the substrate should be selected.
  • the UV absorbent may be selected from the group consisting of cyanoacryl, salicylate, malonic acid ester, oxalic anilide, diketone, hydroxyl benzophenone, hydroxy benzotriazole, organic metals, and mixtures thereof .
  • the UV stabilizer may be selected from the group consisting of piperidinyl ester, oxazolidine and piperidino- oxazolidine, piperidispiroacetal, diazacycloalkanone, and mixtures thereof.
  • the light stabilizer may be used in an amount of 0.01 ⁇ 5 wt%, preferably 0.1 ⁇ 2 wt%, based on the total weight of the resin composition of the substrate layer or surface layer .
  • this component is contained in the surface layer, thereby obtaining a light stabilizing effect, without a decrease in total luminous transmittance or physical properties of the substrate layer .
  • the preparation cost may be reduced.
  • the light-diffusion plate of the present invention may be used for various indoor or outdoor purposes . That is, the light-diffusion plate may be applied to signboards, illuminated signboards, illuminated covers, glass display cases, etc . , and may be preferably used as light-diffusion plates for displays .
  • the light-diffusion plate for a display is typically exemplified by light-diffusion plates for backlight units of LCDs or edge-light-type backlight units .
  • the polycarbonate resin had a melt index of 22 g/10min at 300°C under a load of 1.2 kg according to ASTM D1238
  • the polystyrene resin had a melt index of 1.5 g/10min at 200 0 C under a load of 5 kg according to ASTM D1238.
  • the base resin of the surface layer polymethylmethacrylate, polystyrene or a styrene-acrylic copolymer resin copolymerized using an acrylate monomer and a styrene monomer according to a typical process was used.
  • the light-diffusion plate was formed at 25O 0 C through a co-extruding process using an extruder having screws having diameters of 135 mm and 60 mm.
  • the substrate layer was 2.0 mm thick.
  • the surface layer was formed on one surface of the substrate layer. As such, the substrate layer was 1.0 mm thick and the surface layer was 0.1 mm thick.
  • the substrate layer was comprised by mixing the base resin shown in Table 1 with 0.2 parts by weight of silicone resin beads (average particle size : 2 ⁇ m) as a light-diffusing agent and 0.05 parts by weight of B-cap (tetra-ethyl-2, 2 ' - ( 1, 4-phenylene- dimethylidene) -bismalonate) as a UV absorbent in a light stabilizer
  • the surface layer was comprising the base resin for a surface layer or by mixing the base resin with the fluorine resin or fluorine resin particles as shown in the above tables , 2 parts by weight of silicone resin beads (average particle size : 2 ⁇ m) as a light-diffusing agent and 0.5 parts by weight of B-cap (tetra-ethyl-2 , 2' - ( 1, 4-phenylene- dimethylidene) -bismalonate) as a UV absorbent in a light stabilizer .
  • the light-diffusion plates manufactured in the examples and comparative examples were measured for water absorption rate, bending, total luminous transmittance, haze, yellowing index and thermal deformation temperature .
  • the results are given in Tables 5 to 8.
  • the water absorption rate was measured from a difference in weight by cutting the light-diffusion plate to 10 x 10 cm and then dipping it into water at 25 0 C for 24 hours .
  • the bending was determined in such a manner that the light-diffusion plate was mounted on a 20" sized backlight unit and then allowed to stand at 6O 0 C with a relative humidity of 75% for 96 hours, and a distance between four corners of the light-diffusion plate which were warped upwards and the surface of the backlight unit was measured.
  • the thermal deformation temperature was measured according to ASTM D648.
  • the yellowing index was measured according to ASTM D1003 after exposure was conducted at 40 0 C for 240 hours using a Q-UV tester equipped with an FS-40 313/280 lamp under conditions of ASTM D1925, and the total luminous transmittance and haze were measured according to ASTM D1003.
  • the light- diffusion plate having only the substrate layer comprising the mixture of polycarbonate resin and polystyrene resin as the base resin can be confirmed to have relatively high dimensional stability even under conditions of high temperature and high humidity, with the exception of high yellowing index.
  • the light- diffusion plate having the substrate layer comprising the polycarbonate resin as the base resin and the surface layer formed on one surface of the substrate layer or the surface layer further including the fluorine resin or fluorine resin particles can be confirmed to have high dimensional stability.
  • the polycarbonate resin when used as the base resin for the substrate layer, light properties including dimensional stability can be seen to be excellent, regardless of the kinds of base resin used for the surface layer.
  • the light- diffusion plate having the substrate layer comprising the mixture of polycarbonate resin and polystyrene resin as the base resin and the surface layer formed of PMMA resin as the base resin on one surface of the substrate layer can be confirmed to have excellent dimensional stability and anti- yellowing.
  • the light-diffusion plate having the surface layer further including the fluorine resin or fluorine resin particles has superior dimensional stability to the light- diffusion plate having no fluorine resin or fluorine resin particles .
  • the amount of fluorine resin or fluorine resin particles is increased, dimensional stability becomes more and more excellent .
  • the light- diffusion plate including the substrate layer comprising the mixture of polycarbonate r * esin and polystyrene resin as the base resin and the surface layer formed of the base resin of MS resin on one surface of the substrate layer can be confirmed to have excellent dimensional stability.
  • the light-diffusion plate of the present invention comprises the substrate layer formed of the polycarbonate resin or the mixture of polycarbonate resin and polystyrene resin, it has excellent total luminous transmittance and light diffusibility, in particular, high heat resistance and absorption resistance, and thus has superior dimensional stability. Also, polystyrene resin is used, which is relatively inexpensive compared to polycarbonate resin, thereby decreasing the preparation cost .
  • the light-diffusion plate of the present invention further includes the surface layer, thereby providing anti-yellowing upon exposure to a light source for a long period of time .
  • the surface layer of the light-diffusion plate of the present invention further includes the fluorine resin or fluorine resin particles, whereby dimensional stability is further increased and a yellowing index is further decreased upon exposure to a light source for a long period of time, resulting in light-diffusion plates having more improved properties .
  • the present invention provides a light-diffusion plate .
  • the light-diffusion plate since the light-diffusion plate includes a substrate layer having a polycarbonate resin as a base resin, it has high dimensional stability thanks to high absorption resistance, and thus it generates less of a bending phenomenon . even under conditions of high temperature and high humidity.
  • a surface layer is further included or such a surface layer further includes a fluorine resin or fluorine resin particles, thereby providing a light-diffusion plate having further increased dimensional stability and further decreased yellowing even upon exposure to a light source for a long period of time .

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne une plaque de diffusion de lumière à utiliser dans une unité de rétroéclairage d'un affichage à cristaux liquides ou d'un appareil d'éclairage. En particulier, l'invention concerne une plaque de diffusion de lumière comprenant une couche de substrat préparée en faisant appel à une résine polycarbonate, en tant que résine de base. Ainsi, une telle plaque de diffusion de lumière présente une stabilité dimensionnelle élevée grâce à sa résistance élevée à la chaleur et à sa résistance à l'humidité élevée, et provoque rarement un phénomène de courbure, même dans des conditions de haute température et de haute humidité. En outre, même si la plaque de diffusion de lumière est exposée à une source lumineuse pendant une longue période, celle-ci présente un faible indice de jaunissement.
PCT/KR2006/000279 2005-01-25 2006-01-25 Plaque de diffusion de lumiere WO2006080798A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2006800030890A CN101107546B (zh) 2005-01-25 2006-01-25 扩散板
JP2007553031A JP4857286B2 (ja) 2005-01-25 2006-01-25 光拡散板

Applications Claiming Priority (18)

Application Number Priority Date Filing Date Title
KR1020050006560A KR100635152B1 (ko) 2005-01-25 2005-01-25 광확산판
KR10-2005-0006560 2005-01-25
KR10-2005-0106266 2005-11-08
KR10-2005-0106268 2005-11-08
KR1020050106268A KR100750592B1 (ko) 2005-11-08 2005-11-08 광확산판
KR1020050106266A KR100635154B1 (ko) 2005-11-08 2005-11-08 광확산판
KR10-2005-0121504 2005-12-12
KR10-2005-0121509 2005-12-12
KR10-2005-0121507 2005-12-12
KR10-2005-0121508 2005-12-12
KR10-2005-0121505 2005-12-12
KR1020050121505A KR100754412B1 (ko) 2005-12-12 2005-12-12 광확산판
KR1020050121504A KR100781686B1 (ko) 2005-12-12 2005-12-12 광확산판
KR1020050121508A KR100676774B1 (ko) 2005-12-12 2005-12-12 광확산판
KR1020050121507A KR100781687B1 (ko) 2005-12-12 2005-12-12 광확산판
KR1020050121509A KR100765893B1 (ko) 2005-12-12 2005-12-12 광확산판
KR10-2006-0000386 2006-01-03
KR1020060000386A KR100725827B1 (ko) 2006-01-03 2006-01-03 광확산판

Publications (1)

Publication Number Publication Date
WO2006080798A1 true WO2006080798A1 (fr) 2006-08-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2006/000279 WO2006080798A1 (fr) 2005-01-25 2006-01-25 Plaque de diffusion de lumiere

Country Status (2)

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JP (1) JP4857286B2 (fr)
WO (1) WO2006080798A1 (fr)

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JP2008209723A (ja) * 2007-02-27 2008-09-11 Denki Kagaku Kogyo Kk 光拡散シート
JP2009103884A (ja) * 2007-10-23 2009-05-14 Goyo Paper Working Co Ltd 打ち抜き可能な耐擦傷性複層レンズフイルム
JP2010519568A (ja) * 2007-02-16 2010-06-03 コーロン インダストリーズ インク 拡散プレート
EP2319687A1 (fr) * 2008-08-28 2011-05-11 Mitsubishi Gas Chemical Company, Inc. Stratifié résineux thermoplastique
US20130066002A1 (en) * 2010-05-27 2013-03-14 Idemitsu Kosan Co., Ltd. Polycarbonate resin composition and molded polycarbonate resin

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CN102197323B (zh) * 2008-11-06 2014-07-16 住友化学株式会社 光扩散板及其用途
JP5639413B2 (ja) * 2010-08-24 2014-12-10 株式会社小糸製作所 照明器具用カバーおよび照明器具
JP2019219623A (ja) * 2018-06-22 2019-12-26 株式会社クラレ 光拡散性複層樹脂板
JP2019219622A (ja) * 2018-06-22 2019-12-26 株式会社クラレ 光拡散性複層樹脂板
KR102553243B1 (ko) 2021-06-10 2023-07-07 주식회사 엘엑스엠엠에이 유기 가교 입자를 포함하는 pmma 광확산판 및 이의 제조방법

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JP2002258018A (ja) * 2001-03-02 2002-09-11 Keiwa Inc 光拡散シート及びこれを用いたバックライトユニット
US20040105052A1 (en) * 2002-03-26 2004-06-03 Masakazu Uekita Light diffusion sheet and backlight unit using the same
WO2004109379A1 (fr) * 2003-06-04 2004-12-16 Nippon Polyester Co.,Ltd. Plaque a diffusion de lumiere pour dispositif d'affichage a cristaux liquides et composition de resine polycarbonate destinee a ladite plaque

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010519568A (ja) * 2007-02-16 2010-06-03 コーロン インダストリーズ インク 拡散プレート
JP2008209723A (ja) * 2007-02-27 2008-09-11 Denki Kagaku Kogyo Kk 光拡散シート
JP2009103884A (ja) * 2007-10-23 2009-05-14 Goyo Paper Working Co Ltd 打ち抜き可能な耐擦傷性複層レンズフイルム
EP2319687A1 (fr) * 2008-08-28 2011-05-11 Mitsubishi Gas Chemical Company, Inc. Stratifié résineux thermoplastique
CN102137756A (zh) * 2008-08-28 2011-07-27 三菱瓦斯化学株式会社 热塑性树脂层压体
EP2319687A4 (fr) * 2008-08-28 2011-12-28 Mitsubishi Gas Chemical Co Stratifié résineux thermoplastique
TWI460073B (zh) * 2008-08-28 2014-11-11 Mitsubishi Gas Chemical Co 熱可塑性樹脂積層體
US20130066002A1 (en) * 2010-05-27 2013-03-14 Idemitsu Kosan Co., Ltd. Polycarbonate resin composition and molded polycarbonate resin
US9664818B2 (en) * 2010-05-27 2017-05-30 Idemitsu Kosan Co., Ltd. Polycarbonate resin composition and molded polycarbonate resin
US10059840B2 (en) 2010-05-27 2018-08-28 Idemitsu Kosan Co., Ltd. Polycarbonate resin composition and molded polycarbonate resin
US10995213B2 (en) 2010-05-27 2021-05-04 Idemitsu Kosan Co., Ltd. Polycarbonate resin composition and molded polycarbonate resin

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JP2008532058A (ja) 2008-08-14

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