CN114730022A - Light diffusion plate and direct type surface light source unit - Google Patents
Light diffusion plate and direct type surface light source unit Download PDFInfo
- Publication number
- CN114730022A CN114730022A CN202080077557.9A CN202080077557A CN114730022A CN 114730022 A CN114730022 A CN 114730022A CN 202080077557 A CN202080077557 A CN 202080077557A CN 114730022 A CN114730022 A CN 114730022A
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- Prior art keywords
- tert
- antioxidant
- butyl
- phosphorus
- styrene resin
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 49
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 160
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 58
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 58
- 239000011347 resin Substances 0.000 claims abstract description 40
- 229920005989 resin Polymers 0.000 claims abstract description 40
- 239000011574 phosphorus Substances 0.000 claims abstract description 33
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 33
- 239000011342 resin composition Substances 0.000 claims abstract description 33
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 31
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000002245 particle Substances 0.000 claims description 26
- -1 3-tert-butyl-4-hydroxy-5-methylphenyl Chemical group 0.000 claims description 15
- 229920000642 polymer Polymers 0.000 claims description 9
- 239000002530 phenolic antioxidant Substances 0.000 claims description 7
- SSADPHQCUURWSW-UHFFFAOYSA-N 3,9-bis(2,6-ditert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane Chemical compound CC(C)(C)C1=CC(C)=CC(C(C)(C)C)=C1OP1OCC2(COP(OC=3C(=CC(C)=CC=3C(C)(C)C)C(C)(C)C)OC2)CO1 SSADPHQCUURWSW-UHFFFAOYSA-N 0.000 claims description 6
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 claims description 6
- RRTJOAHJZQVSSE-UHFFFAOYSA-N 1,3,2-dioxaphosphepine Chemical compound C=1C=COPOC=1 RRTJOAHJZQVSSE-UHFFFAOYSA-N 0.000 claims description 5
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 5
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 claims description 5
- QSRJVOOOWGXUDY-UHFFFAOYSA-N 2-[2-[2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propanoyloxy]ethoxy]ethoxy]ethyl 3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C)=CC(CCC(=O)OCCOCCOCCOC(=O)CCC=2C=C(C(O)=C(C)C=2)C(C)(C)C)=C1 QSRJVOOOWGXUDY-UHFFFAOYSA-N 0.000 claims description 4
- ZEFSGHVBJCEKAZ-UHFFFAOYSA-N bis(2,4-ditert-butyl-6-methylphenyl) ethyl phosphite Chemical compound CC=1C=C(C(C)(C)C)C=C(C(C)(C)C)C=1OP(OCC)OC1=C(C)C=C(C(C)(C)C)C=C1C(C)(C)C ZEFSGHVBJCEKAZ-UHFFFAOYSA-N 0.000 claims description 4
- FQUNFJULCYSSOP-UHFFFAOYSA-N bisoctrizole Chemical compound N1=C2C=CC=CC2=NN1C1=CC(C(C)(C)CC(C)(C)C)=CC(CC=2C(=C(C=C(C=2)C(C)(C)CC(C)(C)C)N2N=C3C=CC=CC3=N2)O)=C1O FQUNFJULCYSSOP-UHFFFAOYSA-N 0.000 claims description 4
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- QNEVKCBGTUWWOH-UHFFFAOYSA-N 1,2,3,4-tetrakis(2,4-ditert-butylphenyl)-5-phenylbenzene Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1C(C(=C1C=2C(=CC(=CC=2)C(C)(C)C)C(C)(C)C)C=2C(=CC(=CC=2)C(C)(C)C)C(C)(C)C)=CC(C=2C=CC=CC=2)=C1C1=CC=C(C(C)(C)C)C=C1C(C)(C)C QNEVKCBGTUWWOH-UHFFFAOYSA-N 0.000 claims description 3
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- CGRTZESQZZGAAU-UHFFFAOYSA-N [2-[3-[1-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propanoyloxy]-2-methylpropan-2-yl]-2,4,8,10-tetraoxaspiro[5.5]undecan-9-yl]-2-methylpropyl] 3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C)=CC(CCC(=O)OCC(C)(C)C2OCC3(CO2)COC(OC3)C(C)(C)COC(=O)CCC=2C=C(C(O)=C(C)C=2)C(C)(C)C)=C1 CGRTZESQZZGAAU-UHFFFAOYSA-N 0.000 claims description 3
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 3
- BJEMXPVDXFSROA-UHFFFAOYSA-N 3-butylbenzene-1,2-diol Chemical group CCCCC1=CC=CC(O)=C1O BJEMXPVDXFSROA-UHFFFAOYSA-N 0.000 claims description 2
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- XQRLCLUYWUNEEH-UHFFFAOYSA-L diphosphonate(2-) Chemical compound [O-]P(=O)OP([O-])=O XQRLCLUYWUNEEH-UHFFFAOYSA-L 0.000 claims description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims 1
- JIGUICYYOYEXFS-UHFFFAOYSA-N 3-tert-butylbenzene-1,2-diol Chemical compound CC(C)(C)C1=CC=CC(O)=C1O JIGUICYYOYEXFS-UHFFFAOYSA-N 0.000 abstract description 10
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- 239000000243 solution Substances 0.000 description 5
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 3
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- VBWIZSYFQSOUFQ-UHFFFAOYSA-N cyclohexanecarbonitrile Chemical compound N#CC1CCCCC1 VBWIZSYFQSOUFQ-UHFFFAOYSA-N 0.000 description 1
- 238000001212 derivatisation Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010556 emulsion polymerization method Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002432 hydroperoxides Chemical class 0.000 description 1
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 description 1
- 150000003949 imides Chemical class 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 239000011146 organic particle Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 150000004978 peroxycarbonates Chemical class 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- FZYCEURIEDTWNS-UHFFFAOYSA-N prop-1-en-2-ylbenzene Chemical compound CC(=C)C1=CC=CC=C1.CC(=C)C1=CC=CC=C1 FZYCEURIEDTWNS-UHFFFAOYSA-N 0.000 description 1
- FVSKHRXBFJPNKK-UHFFFAOYSA-N propionitrile Chemical compound CCC#N FVSKHRXBFJPNKK-UHFFFAOYSA-N 0.000 description 1
- 239000007870 radical polymerization initiator Substances 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010558 suspension polymerization method Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- YOEYNURYLFDCEV-UHFFFAOYSA-N tert-butyl hydroxy carbonate Chemical compound CC(C)(C)OC(=O)OO YOEYNURYLFDCEV-UHFFFAOYSA-N 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
-
- 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
-
- 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
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Medicinal Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nonlinear Science (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Optical Elements Other Than Lenses (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Provided is a light diffusion plate containing a styrene resin composition, which has excellent long-term durability and strength. According to the present invention, there is provided a light diffusion plate comprising a styrene resin composition, wherein the styrene resin composition comprises a styrene resin (A), an antioxidant (B) and a light diffusion agent (C), the antioxidant (B) comprises at least one of a phosphorus antioxidant (B-1), a phenol antioxidant (B-2) and a phosphorus/phenol antioxidant (B-3), the total amount of the phosphorus antioxidant (B-1) and the phosphorus/phenol antioxidant (B-3) is 0.001 to 0.5 parts by mass, the total amount of the phenol antioxidant (B-2) and the phosphorus/phenol antioxidant (B-3) is 0.001 to 0.5 parts by mass, and the content of t-butylcatechol contained in the styrene resin composition is 0.1 to 10 μ g/g, based on 100 parts by mass of the styrene resin composition.
Description
Technical Field
The present invention relates to a light diffusion plate and a direct type surface light source unit.
Background
The light diffusion plate is used for a direct type liquid crystal display device and the like. A direct type liquid crystal display device is a display device including a liquid crystal cell and a backlight device located directly below the liquid crystal cell, the backlight device uses LEDs as light sources, and a light diffusion plate is disposed on the front surface of the backlight device. Further, a styrene resin composition can be used as a resin constituting the light diffusion plate (patent document 1).
[ Prior art documents ]
[ patent document ]
Patent document 1 Japanese patent laid-open publication No. 2010-134461
Disclosure of Invention
Problems to be solved by the invention
However, the LED used as a light source becomes high in power in response to the high luminance, and the long-term durability of the conventional light diffusion plate made of a styrene-based resin composition becomes insufficient due to an increase in calorific value and the like. In addition, the strength may not be satisfactory.
The present invention has been made in view of the above problems, and provides a light diffuser plate containing a styrene resin composition, which has excellent long-term durability and strength.
Means for solving the problems
According to the present invention, there is provided a light diffusion plate comprising a styrene resin composition, wherein the styrene resin composition comprises a styrene resin (A), an antioxidant (B), and a light diffusion agent (C), the antioxidant (B) comprises at least one of a phosphorus antioxidant (B-1), a phenol antioxidant (B-2), and a phosphorus/phenol antioxidant (B-3), the total amount of the phosphorus antioxidant (B-1) and the phosphorus/phenol antioxidant (B-3) is 0.001 to 0.5 parts by mass, the total amount of the phenol antioxidant (B-2) and the phosphorus/phenol antioxidant (B-3) is 0.001 to 0.5 parts by mass, and the content of tert-butyl catechol contained in the styrene resin composition is 0.1 to 10 μ g/g, based on 100 parts by mass of the styrene resin composition.
The present inventors have conducted extensive studies and found that the styrene resin composition is excellent in long-term durability and strength when the contents of t-butylcatechol, a phosphorus antioxidant, a phenol antioxidant, a phosphorus/phenol antioxidant and a light diffusing agent are in predetermined ranges, and have completed the present invention.
Hereinafter, various embodiments of the present invention will be described by way of examples. The embodiments shown below can be combined with each other.
Preferably, the phosphorus-based antioxidant (B-1) is at least one selected from the group consisting of 2,2 '-methylenebis (4, 6-di-tert-butyl-1-phenoxy) (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' diphosphonate and bis (2, 4-di-tert-butyl-6-methylphenyl) ethyl phosphite.
Preferably, the phenol-based antioxidant (B-2) is selected from the group consisting of 6- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propoxy ] -2,4,8, 10-tetra-tert-butyldibenzo [ d, f ] [1,3,2] dioxaphosphepin, octadecyl-3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, ethylenebis (oxyethylene) bis [3- (5-tert-butyl-4-hydroxy-m-tolyl) propionate ], pentaerythrityl tetrakis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], 3, 9-bis [2- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate ] ) Propionyloxy ] -1, 1-dimethylethyl ] -2,4,8, 10-tetraoxaspiro [5.5] undecane.
Preferably, the above-mentioned phosphorus/phenol antioxidant (B-3) is 6- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propoxy ] -2,4,8, 10-tetra-tert-butyldibenzo [ d, f ] [1,3,2] dioxaphosphepin.
Preferably, the light diffusion plate is one in which the light diffusion agent (C) is at least one selected from the group consisting of acrylic polymer crosslinked particles, styrene polymer crosslinked particles, and silicone polymer crosslinked particles.
Preferably, the styrene resin (a) has a weight average molecular weight (Mw) of 20 to 40 ten thousand, 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.
Preferably, the light diffusion plate is used for an LED light source.
Preferably, a direct type surface light source unit has the light diffusion plate.
Detailed Description
Hereinafter, embodiments of the present invention will be described. Various feature items shown in the embodiments shown below can be combined with each other. The present invention is implemented independently for each feature.
1. Light diffusion plate
A light diffuser plate according to an embodiment of the present invention is a light diffuser plate containing a styrene resin composition. The thickness of the light diffusion plate is not particularly limited, and is, for example, 1 to 3 mm. Further, the light diffuser plate may be formed by laminating an ultraviolet absorbing layer mixed with an ultraviolet absorber or a light stabilizer.
One embodiment relates to a light diffusion plate, the surface of which may be coated with an antistatic agent. By applying the antistatic agent, adhesion of dust and the like due to static electricity can be suppressed after the light diffusion plate is mounted on the backlight device, and thus the backlight device can be used for a long period of time without lowering the luminance. The light diffuser plate of the present invention may have fine irregularities such as embosses on both surfaces or one surface, and may have a lens shape such as a semicircular shape or an elliptical shape or a prism shape on both surfaces or one surface.
< styrene resin composition >
The styrene resin composition contains a styrene resin (A), an antioxidant (B) and a light diffuser (C). The styrene resin composition contains 0.1 to 10 [ mu ] g of tert-butyl catechol. When the content is within this range, the long-term durability and strength can be improved. The content of t-butylcatechol is specifically 0.1,0.5,1,1.5,2,2.5,3,4,5,6,7,8,9,10 μ g/g, and may be within a range of 2 of any of the values exemplified herein. When the content of t-butyl catechol is less than 0.1 μ g/g, the effect of inhibiting oxidative deterioration during thermal molding is small, and therefore, the strength of the light diffusion plate is weakened, and when the content of t-butyl catechol is more than 10 μ g/g, t-butyl catechol itself becomes a coloring component, and not only the long-term durability of the light diffusion plate is lowered, but also the strength is lowered.
< styrene resin (A) >
The styrene resin (a) is a resin obtained by polymerizing a styrene monomer as a main component, and specifically, a resin containing more than 50% of a styrene monomer. The styrene monomer is a single or a mixture of 2 or more species of styrene, α -methylstyrene, o-methylstyrene, p-methylstyrene, m-methylstyrene, ethylstyrene, p-tert-butylstyrene, etc., which are aromatic styrene monomers, and styrene is preferred. The styrene resin (a) may be a copolymer obtained by copolymerizing a styrene monomer with a monomer copolymerizable with the styrene monomer, and examples of the monomer copolymerizable with the styrene monomer include acrylic monomers such as acrylic acid and methacrylic acid, vinyl cyanide monomers such as acrylonitrile and methacrylonitrile, acrylic monomers such as butyl acrylate, ethyl acrylate, methyl acrylate and methyl methacrylate, and imide monomers such as α, β -ethylenically unsaturated carboxylic acids such as maleic anhydride and fumaric acid, phenylmaleimide and cyclohexylmaleimide. These monomers may be used singly or in combination.
The weight average molecular weight (Mw) of the styrene resin (a) is preferably 20 to 40 ten thousand, more preferably 20 to 29 ten thousand. The ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the styrene resin (A) is preferably 1.0 to 3.0, more preferably 1.5 to 2.5. The ratio (Mz/Mw) of the Z-average molecular weight (Mz) to the weight-average molecular weight (Mw) of the styrene resin (a) is preferably 1.0 to 2.0. When the refractive index is within this range, both moldability and strength of the light diffusion plate can be achieved. The strength is good when the weight average molecular weight (Mw) is 20 ten thousand or more, and the moldability is good when the weight average molecular weight (Mw) is 40 ten thousand or less. The moldability is good when the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is 1.0 or more, and the strength is good when the ratio is 3.0 or less. When the ratio (Mz/Mw) of the Z-average molecular weight (Mz) to the weight-average molecular weight (Mw) is 1.0 or more, moldability is good, and strength is good when the ratio is 2.0 or less.
< antioxidant (B) >
The antioxidant (B) includes at least one of a phosphorus antioxidant (B-1), a phenol antioxidant (B-2) and a phosphorus/phenol antioxidant (B-3).
The styrene resin composition contains 0.001 to 0.5 parts by mass of the total of the phosphorus antioxidant (B-1) and the phosphorus/phenol antioxidant (B-3) per 100 parts by mass of the styrene resin, and preferably contains 0.05 to 0.3 parts by mass. By making it within this range, the light diffusion plate is excellent in long-term durability and strength. The total content of the phosphorus-based antioxidant (B-1) and the phosphorus/phenol-based antioxidant (B-3) is specifically 0.001,0.005,0.01,0.02,0.03,0.04,0.05,0.1,0.15,0.2,0.25,0.3,0.35,0.4,0.45,0.5 parts by mass per 100 parts by mass of the styrene-based resin, and may be in the range of 2 or more of the numerical values exemplified here. .
The total amount of the phenolic antioxidant (B-2) and the phosphorus-phenolic antioxidant (B-3) is 0.001 to 0.5 part by mass, preferably 0.02 to 0.3 part by mass, and more preferably 0.05 to 0.15 part by mass. By making it within this range, the light diffusion plate is excellent in long-term durability and strength. The total content of the phenol antioxidant (B-2) and the phosphorus/phenol antioxidant (B-3) is specifically 0.001,0.005,0.01,0.02,0.03,0.04,0.05,0.1,0.15,0.2,0.25,0.3,0.35,0.4,0.45,0.5 parts by mass per 100 parts by mass of the styrene resin, and may be in the range of 2 or more of the numerical values exemplified here. .
The phosphorus-based antioxidant (B-1) is a phosphite having no phenolic hydroxyl group in the basic skeleton thereof, and is preferably a phosphite of a trivalent phosphorus compound. The phosphorus-based antioxidant (B-1) is at least one selected from 2,2 '-methylenebis (4, 6-di-tert-butyl-1-phenoxy) (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' diphosphonite, bis (2, 4-di-tert-butyl-6-methylphenyl) ethyl phosphite, and the like.
The phenolic antioxidant (B-2) is an antioxidant other than a (phosphite) phosphate having a phenolic hydroxyl group in its basic skeleton. The phenolic antioxidant (B-2) may be at least one selected from among octadecyl-3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionate, ethylene bis (oxyethylene) bis [3- (5-t-butyl-4-hydroxy-m-tolyl) propionate ], pentaerythritol tetrakis [3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ], 3, 9-bis [2- [3- (3-t-butyl-4-hydroxy-5-methylphenyl) propionyloxy ] -1, 1-dimethylethyl ] -2,4,8, 10-tetraoxaspiro [5.5] undecane, and the like, for example.
The phosphorus/phenol antioxidant (B-3) is a phosphate (phosphite) having a phenolic hydroxyl group in its basic skeleton, and preferably a phosphite of a trivalent phosphorus compound having a phenolic hydroxyl group in its basic skeleton. The phosphorus/phenol antioxidant (B-3) is 6- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propoxy ] -2,4,8, 10-tetra-tert-butyldibenzo [ d, f ] [1,3,2] dioxaphosphepin or the like.
< light diffusing agent (C) >
The styrene resin composition contains 0.1 to 10 parts by mass of the light diffusing agent (C), preferably 0.5 to 3 parts by mass, and more preferably 0.8 to 1.5 parts by mass, based on 100 parts by mass of the styrene resin. By making it within this range, the light diffusion plate is excellent in long-term durability and strength. The content of the light diffusing agent (C) is specifically 0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1.0, 1.5,2, 3,4,5,6,7,8,9,10 parts by mass relative to 100 parts by mass of the styrene resin, and may be within a range of any 2 of the numerical values exemplified herein.
The light diffusing agent (C) is a particle having a refractive index different from that of the styrene resin composition, and can be used if it diffuses incident light, and examples thereof include organic particles such as styrene polymer crosslinked particles, acrylic polymer crosslinked particles, and silicone polymer crosslinked particles, and inorganic particles such as glass beads, silica particles, aluminum hydroxide particles, calcium carbonate particles, barium sulfate particles, titanium oxide particles, and talc particles. Among them, at least one selected from the group consisting of acrylic polymer crosslinked particles, styrene polymer crosslinked particles, and silicone polymer crosslinked particles is preferable. The average particle diameter of the light diffusing agent (C) is preferably 1 to 20 μm. When the average particle size of the light diffusing agent (C) is less than 1 μm, the hue may be deteriorated, and when it exceeds 20 μm, the light diffusivity may be insufficient.
< other additives >
Various additives may be added to the styrene resin composition as needed within a range not to impair the characteristics of the present invention. The type of the additive is not particularly limited as long as it is generally used for plastics, and examples thereof include flame retardants, lubricants, processing aids, antiblocking agents, antistatic agents, antifogging agents, light resistance improvers, softeners, plasticizers, inorganic reinforcing agents, crosslinking agents, pigments, dyes, others, and mixtures thereof.
2. Styrene resin composition and method for producing light diffusion plate
The styrene resin composition of the present invention can be produced by adding an antioxidant (B) and a light diffusing agent (C) to a styrene resin (a). The antioxidant (B) and the light diffusing agent (C) may be added when the styrene resin (a) is polymerized, or may be produced by melt-kneading the antioxidant (B) and the light diffusing agent (C) in an extruder after the styrene resin (a) is polymerized. Further, it can be prepared by preliminarily melt-kneading the antioxidant (B) and the light diffusing agent (C) together with a small amount of a styrene-based resin to obtain a pellet-shaped master batch, dry-mixing the styrene-based resin (a) with the master batch, and melt-kneading the mixture.
Examples of the polymerization method of the styrene resin include known styrene polymerization methods such as a bulk 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 the continuous polymerization is preferable. Examples of the solvent include alkylbenzenes such as benzene, toluene, ethylbenzene, and xylene, ketones such as acetone and methyl ethyl ketone, and aliphatic hydrocarbons such as hexane and cyclohexane.
In the polymerization of the styrene resin (a), a polymerization assistant such as a polymerization initiator, a chain transfer agent, a crosslinking agent, and the like, and other polymerization assistants may be used as necessary. As the polymerization initiator, a radical polymerization initiator is preferred, and conventionally known examples thereof include peroxides such as 1, 1-bis (t-butylperoxy) cyclohexane, 2-bis (t-butylperoxy) butane, 2-bis (4, 4-di-t-butylperoxycyclohexyl) propane and 1, 1-bis (t-amylperoxy) cyclohexane, hydroperoxides such as cumene hydroperoxide and t-butylhydroperoxide, alkyl peroxides such as t-butyl peroxyacetate and t-amyl peroxyisononanoate, dialkyl peroxides such as t-butylcumyl peroxide, di-t-butyl peroxide, dicumyl peroxide and di-t-hexylperoxide, peroxyesters such as t-butyl peroxyacetate, t-butyl peroxybenzoate and t-butylperoxyisopropyl monocarbonate, t-butylperoxyisopropyl carbonate, peroxyisopropyl carbonate, and the like, Peroxycarbonates such as polyether tetra (t-butyl peroxycarbonate), N '-azobis (cyclohexane-1-carbonitrile), N' -azobis (2-methylbutyronitrile), N '-azobis (2, 4-dimethylvaleronitrile), N' -azobis [2- (hydroxymethyl) propionitrile ], and the like, and 1 or 2 or more of these may be used in combination. Examples of the chain transfer agent include aliphatic mercaptans, aromatic mercaptans, pentaphenyl ethane, α -methylstyrene dimer, terpinolene, and the like.
In the continuous polymerization, the styrene resin can be produced by a method including a polymerization step, a devolatilization step, and a granulation step.
First, in the polymerization step, a polymerization reaction is controlled by using a known complete mixing tank-type stirring vessel, a column-type reactor, or the like, and the polymerization temperature is adjusted to achieve a target molecular weight, molecular weight distribution, and reaction conversion.
The polymerization solution containing the polymer leaving the polymerization step is transferred to a devolatilization step, and unreacted monomers and polymerization solvent are removed. The devolatilization step is composed of a vacuum devolatilization tank with a heater, a devolatilization extruder with a vent, and the like. The polymer in a molten state leaving the devolatilization step is transferred to a granulation step. In the granulating step, the molten resin is extruded from the porous die into a strand shape, and processed into a pellet shape by a cold cutting method, an in-air hot cutting method, or an in-water hot cutting method.
The content of t-butylcatechol in the styrene resin composition can be adjusted to the content at the start of polymerization of the styrene resin (a) and the content in the subsequent devolatilization step. The addition of the styrene resin (a), the antioxidant (B), the light diffusing agent (C), and the like to the styrene resin (a) can be adjusted before or after the addition of the styrene resin (a), the antioxidant (B), the light diffusing agent (C), and the like.
The light diffuser plate can be molded by extrusion molding, injection molding of a styrene resin composition, or the like, and is preferably manufactured by extrusion molding. The extrusion molding may be, for example, a method in which a styrene-based resin composition is melt-kneaded using a single-screw extruder or a twin-screw extruder, and the kneaded product is continuously set in a T-die and then cooled and fixed by a cooling roll unit. When the surface of the light diffusion plate is formed with the irregular shape, the surface of the cooling roll is provided with a transcription type, and the shape of the transcription type is changed to form an arbitrary irregular shape. In addition, when surface layers are laminated on both surfaces or one surface of the light diffusion plate, a co-extrusion method, a pasting method, a thermal bonding method, a solvent bonding method, a casting method, a surface coating method, or the like can be used.
3. Others
The light diffusion plate according to one embodiment of the present invention can be used as a light diffusion plate for an LED light source.
A direct type surface light source unit according to an embodiment of the present invention is a direct type surface light source unit having the light diffusion plate.
[ examples ] A method for producing a compound
The present invention will be described in more detail below with reference to examples. These are merely examples, and the present invention is not limited thereto.
1. Measurement method
< molecular weight >
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 type Shodex GPC-101 manufactured by Showa Denko K.K
Column PLgel10 μm MIXED-B manufactured by Polymer laboratories Inc
Mobile phase of tetrahydrofuran
Sample concentration 0.2% by mass
The temperature is 40 ℃ in an oven, 35 ℃ at an injection port and 35 ℃ at a detector
Differential refractometer
The molecular weight was calculated from the elution curve of monodisperse polystyrene at each elution time and calculated as a molecular weight in terms of polystyrene.
< melt Mass Flow Rate (MFR) >
Measured according to JIS K7210 at 200 ℃ under 49N load.
< Vicat softening temperature >
Measured according to JIS K7206 at a temperature rise rate of 50 ℃/hr and a test load of 50N.
< content of t-butylcatechol (TBC) >
After 0.2g of a styrene resin was dissolved in a small amount of THF, 200 μ L of BSTFA (M, O-bis (trimethylsilyl) trifluoroacetamide) was added to perform trimethylsilyl derivatization treatment, and after 10mL of volume was made with THF, the centrifuged supernatant was measured by gas chromatography mass spectrometry (GC/MS) under the following conditions. Note that a calibration curve prepared in advance is used to determine the concentration.
GC apparatus 7890A, Agilent Corp
Column DB-5ms (0.25 mmi.d.. times.30 m) manufactured by Agilent corporation
The thickness of the liquid film is 0.25 mu m
Column temperature 50 deg.C (1min) → (20 deg.C/min heating) →
320 deg.C (6.5min) for 20min
Injection port 300 deg.C, 1.5mL/min, (split ratio 1:5)
The injection amount is 1 muL
MS device 5975C manufactured by Agilent
The interface temperature is 320 DEG C
MS detection conditions SIM determines TBC (m/z 295 for quantitation, m/z310 for confirmation)
< Total light transmittance, YI >
The total light transmittance in the thickness direction of the light diffusion plate was measured according to JIS-K7105 using a haze meter NDH5000 manufactured by Nippon Denshoku industries Co., Ltd.
<YI>
The YI of the light diffusion plate was measured by a reflection method in accordance with JIS-K7105 using a color measuring instrument NDJ4000 manufactured by Nippon Denshoku industries Co., Ltd.
< average luminance difference >
After a liquid crystal panel, various optical films, and a light diffusion plate were taken out from a commercially available 20-inch direct type LED liquid crystal television, the center portion of the light diffusion plate was hollowed out to have a square shape of 115mm × 115mm, and a 115mm × 115mm evaluation test piece cut out from the light diffusion plate obtained in examples and comparative examples or a 115mm × 115mm evaluation test piece after an endurance test was attached to the hollowed-out portion, and the light diffusion plate was attached to the liquid crystal television frame after the taking-out. Thereafter, two commercially available light diffusion films were laminated on the front side of the light diffusion plate, and a luminance improving film ("DBFF" manufactured by 3M) was further laminated on the front side thereof, and the luminance at each point (51 × 51 at 2601) was measured over the entire front surface of the lcd tv using a multipoint luminance meter with the LED turned on, and the average value of the luminances was defined as the average luminance (cd/M)2). Further, the average luminance difference (%) was obtained by the following equation.
Average luminance difference (%) { (average luminance of example) - (average luminance of comparative example 1) }/(average luminance of comparative example 1) × 100
< diffusion Rate >
The light was entered from a white light source in a direction perpendicular to the surface of the light diffusion plate using a goniophotometer manufactured by Optech, and the luminance of transmitted light was measured at 5 degrees, 20 degrees, and 70 degrees with the direction perpendicular to the surface of the light diffusion plate being 0 degree, and the diffusivity was obtained by the following formula.
Light diffusivity (%) — (luminance of 20 degrees + luminance of 70 degrees)/(luminance of 5 degrees × 2) × 100
< Strength >
A test piece of 200 mm. times.200 mm was cut out of the light diffusion plate to obtain an evaluation test piece. A ball having a weight of 16.6g was used, and the 50% fracture height was measured according to JIS K-7211 and evaluated according to the following criteria.
50% breaking height greater than 40cm
Delta, 50% breaking height of 20-40 cm
X 50% of the height of fracture is less than 20cm
2. Durability test
After cutting out a light diffuser plate of 115mm × 115mm, the evaluation test piece was exposed for 1000 hours in a tank set at a temperature of 80 ℃ using a Machil-hardened Gear oven HISPECH T310.
The results of the long-term durability are shown in the respective measurement results after the above-described durability test.
3. Synthesis of styrene resin
Styrene resins PS-1 to PS-5 were synthesized under the conditions shown in Table 1.
(Synthesis of PS-1)
A first reactor and a second reactor, which were a complete mixing type stirring tank, and a third reactor, which was a plug flow reactor equipped with a static mixer, were connected in series to constitute a polymerization step, and styrene-based resins were produced under the conditions shown in table 1. 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 from the raw material composition shown in table 1, and the raw material solution was continuously supplied to the first reactor at a flow rate shown in table 1. The polymerization initiator was added to the raw material solution at an addition concentration (concentration based on the mass of the raw material styrene) shown in table 1 at the inlet of the first reactor, and uniformly mixed. The polymerization initiators described in table 1 are shown below:
polymerization initiator 1:2, 2-bis (4, 4-t-butylperoxycyclohexyl) propane (Pertetra, manufactured by Nichii oil Co., Ltd.) was used
Polymerization initiator 2:1, 1-bis (t-butylperoxy) cyclohexane (Perh EXAC manufactured by Nichikoku Co., Ltd.)
In the third reactor, a temperature gradient was applied in the flow direction, and the intermediate portion and the outlet portion were adjusted to the temperatures in table 1.
Next, the polymer-containing solution continuously withdrawn from the third reactor was introduced into a two-stage vacuum devolatilization vessel equipped with a preheater and configured in series, and the temperature of the preheater was adjusted to the resin temperature shown in table 1 and the pressure shown in table 1, thereby separating unreacted styrene and ethylbenzene, followed by extrusion in pellets from a porous die, and the pellets were cooled and cut by a cold cutting method to form pellets.
PS-2 to PS-5 were synthesized in the same manner as PS-1, except that the conditions were changed according to Table 1.
[ TABLE 1 ]
1 mass basis concentration based on total monomer
4. Examples comparative examples
The following methods were used to carry out the examples and comparative examples.
< example 1>
A styrene-based resin composition was obtained by mixing 0.2 parts by mass of a phosphorus antioxidant (HP-10), 0.1 parts by mass of a phosphorus-phenol antioxidant (GP), and 1.0 part by mass of a light diffusing agent (MBX-8) with 100 parts by mass of a styrene-based resin (PS-1) containing Tertiary Butyl Catechol (TBC) in an amount shown in Table 1 by a mixer, and mixing the components at a cylinder temperature of 230 ℃ and a screw rotation speed of 100rpm by using a single-screw extruder having a screw diameter of 40 mm.
Then, the styrene resin composition is supplied to a uniaxial air vent extruder with a screw diameter of 90mm and an L/D of 32, melt-kneaded at 200 to 235 ℃, discharged at 245 to 250 ℃ by a T die with a die lip width of 1000mm and a die lip opening of 3.0mm, cooled and solidified by 3 vertical cooling rolls, and trimmed to obtain an optical diffuser plate with a width of 800mm and a thickness of 2.0 mm. The initial optical properties of the light diffusion plate were measured by each measurement method, and the initial intensity was measured. Thereafter, the durability test was performed, and the optical properties after the test were measured by each measurement method. These results are shown in Table 2.
< examples 2 to 15 > comparative examples 1 to 7>
Resin compositions and light diffusion plates were obtained and measured in the same manner as in example 1, except that the conditions in examples 2 to 15 and comparative examples 1 to 7 were changed as shown in tables 2 and 3. The results are shown in tables 2 and 3.
[ TABLE 2]
[ TABLE 3 ]
The abbreviations in the table are as follows.
HP-10:2, 2' -methylenebis (4, 6-di-tert-butyl-1-phenyloxy) (2-ethylhexyloxy) phosphorus (manufactured by ADEKA, Inc.; HP-10)
168 tris (2, 4-di-tert-butylphenyl) phosphite (Irgafos 168, manufactured by BASF Japan K.K.)
PEP-36 3, 9-bis (2, 6-di-tert-butyl-4-methylphenoxy) -2,4,8, 10-tetraoxa-3, 9-diphosphaspiro [5.5] undecane (manufactured by ADEKA Co., Ltd.; PEP-36)
P-EPQ tetrakis (2, 4-di-tert-butylphenyl) [1, 1-biphenyl ] -4, 4-diyl diphosphonite (product of BASFJapa n Co., Ltd.; IrgafosP-EPQ)
38 bis (2, 4-di-tert-butyl-6-methylphenyl) ethyl phosphite (product of BASF Japan; Irgafos38)
GP 6- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propoxy ] -2,4,8, 10-tetra-tert-butyldibenzo [ d, f ] [1,3,2] dioxaphosphorin-heptine (Sumilizer GP, Sumitomo chemical Co., Ltd.)
1076 octadecyl-3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate (Irganox 1076, manufactured by BASF Japan K.K.)
245 ethylene bis (oxyethylene) bis [3- (5-tert-butyl-4-hydroxy-m-tolyl) propionate ] (Irganox 245, manufactured by BAS FJapan K.K.)
1010 pentaerythrityl tetrakis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (Irganox 1010, BASF Japan K.K.)
AO80 3, 9-bis [2- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy ] -1, 1-dimethylethyl ] -2,4,8, 10-tetraoxaspiro [5.5] undecane (ADKSTABAO-80, manufactured by ADEKA Co., Ltd.)
MBX-8 acrylic crosslinked particles (average particle diameter 8 μm, manufactured by WATERING CHEMICAL CO., LTD.; MBX-8)
SBX-8 polystyrene-based crosslinked particles (average particle diameter 8 μm, manufactured by Water-accumulative chemical Co., Ltd.; SBX-8)
KMP-590 silicon-based crosslinked particles (average particle diameter: 2 μm, manufactured by shin-Etsu chemical Co., Ltd.; KMP-590)
Claims (8)
1. A light diffusion plate comprises a styrene resin composition,
the styrene resin composition contains styrene resin (A), antioxidant (B) and light diffusant (C),
the antioxidant (B) contains at least one of a phosphorus antioxidant (B-1), a phenol antioxidant (B-2) and a phosphorus/phenol antioxidant (B-3),
the styrene resin composition comprises, based on 100 parts by mass of the styrene resin:
0.001 to 0.5 parts by mass in total of the phosphorus-based antioxidant (B-1) and the phosphorus-phenol-based antioxidant (B-3),
0.001 to 0.5 parts by mass in total of the phenolic antioxidant (B-2) and the phosphorus-phenolic antioxidant (B-3),
0.1 to 10 parts by mass of the light diffusing agent (C),
the content of the tertiary butyl catechol contained in the styrene resin composition is 0.1-10 mu g/g.
2. The light diffuser plate according to claim 1,
the phosphorus-based antioxidant (B-1) is at least one selected from 2,2 '-methylenebis (4, 6-di-tert-butyl-1-phenoxy) (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' diphosphonate and bis (2, 4-di-tert-butyl-6-methylphenyl) ethyl phosphite.
3. The light diffuser plate according to claim 1 or claim 2,
the phenolic antioxidant (B-2) is selected from the group consisting of 6- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propoxy ] -2,4,8, 10-tetra-tert-butyldibenzo [ d, f ] [1,3,2] dioxaphosphepin, octadecyl-3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, ethylene bis (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-tetraoxaspiro [5.5] undecane.
4. The light diffuser plate according to any one of claims 1 to 3,
the above-mentioned phenol-based phosphorus antioxidant (B-3) is 6- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propoxy ] -2,4,8, 10-tetra-tert-butyldibenzo [ d, f ] [1,3,2] dioxaphosphepin.
5. The light diffuser plate according to any one of claims 1 to 4,
the light diffusing agent (C) is at least one selected from acrylic polymer cross-linked particles, styrene polymer cross-linked particles and siloxane polymer cross-linked particles.
6. The light diffuser plate according to any one of claims 1 to 5,
the styrene resin (A) has a weight-average molecular weight (Mw) of 20 to 40 ten thousand, and the ratio (Mw/Mn) of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn) is 1.0 to 3.0.
7. The light diffuser plate according to any one of claims 1 to 6,
the light diffusion plate is used for an LED light source.
8. A direct type surface light source unit having the light diffusion plate of any one of claims 1 to 7.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| JP2019232946 | 2019-12-24 | ||
| JP2019-232946 | 2019-12-24 | ||
| PCT/JP2020/047109 WO2021132001A1 (en) | 2019-12-24 | 2020-12-17 | Light diffusion plate and direct surface light source unit |
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| Publication Number | Publication Date |
|---|---|
| CN114730022A true CN114730022A (en) | 2022-07-08 |
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| CN202080077557.9A Pending CN114730022A (en) | 2019-12-24 | 2020-12-17 | Light diffusion plate and direct type surface light source unit |
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| JP (1) | JPWO2021132001A1 (en) |
| KR (1) | KR20220118526A (en) |
| CN (1) | CN114730022A (en) |
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| WO2010053204A1 (en) | 2008-11-06 | 2010-05-14 | 住友化学株式会社 | Light diffuser plate and use thereof |
| WO2017094748A1 (en) * | 2015-11-30 | 2017-06-08 | デンカ株式会社 | Transparent highly heat-resistant styrene copolymer |
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2020
- 2020-12-17 CN CN202080077557.9A patent/CN114730022A/en active Pending
- 2020-12-17 KR KR1020227025179A patent/KR20220118526A/en unknown
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- 2020-12-17 WO PCT/JP2020/047109 patent/WO2021132001A1/en active Application Filing
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Patent Citations (10)
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| JP2006206751A (en) * | 2005-01-28 | 2006-08-10 | Teijin Chem Ltd | Light dispersive aromatic polycarbonate resin composition |
| JP2006299192A (en) * | 2005-04-25 | 2006-11-02 | Asahi Kasei Chemicals Corp | Styrene-based resin composition containing silicone-based particle |
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| CN102257021A (en) * | 2008-12-17 | 2011-11-23 | 电气化学工业株式会社 | Molded object for optical use, and lightguide plate and light diffuser both comprising same |
| CN107250255A (en) * | 2015-02-12 | 2017-10-13 | 电化株式会社 | Optics styrene resin composite |
| CN107207848A (en) * | 2015-03-26 | 2017-09-26 | 住化Pc有限公司 | Poly carbonate resin composition and molded article for optical use |
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| JPWO2021132001A1 (en) | 2021-07-01 |
| WO2021132001A1 (en) | 2021-07-01 |
| MX2022005316A (en) | 2022-05-26 |
| TW202132822A (en) | 2021-09-01 |
| KR20220118526A (en) | 2022-08-25 |
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