CN101285897A - Light diffusing plate resin composition and light diffusing plate - Google Patents
Light diffusing plate resin composition and light diffusing plate Download PDFInfo
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- CN101285897A CN101285897A CNA2007101053881A CN200710105388A CN101285897A CN 101285897 A CN101285897 A CN 101285897A CN A2007101053881 A CNA2007101053881 A CN A2007101053881A CN 200710105388 A CN200710105388 A CN 200710105388A CN 101285897 A CN101285897 A CN 101285897A
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Abstract
The invention relates to an optical diffuser plate with low water-absorption, high hardness and excellent heat resistance performance and resin components used by the same. Against 100 weight portion of copolymer resin, 0.1 to 0.2 weight portion of the copolymer resin is dispersed to obtain diffuser resin components which consist of cross-linked siloxane polymer particles, acrylic polymer particles or calcium carbonate, and the diffuser plate which makes the diffuser resin components into molding, wherein the compositions by weight portion of the copolymer resin are: 5 to 40 weight portions of methyl methacrylate monomer, 5 to 55 weight portions of alpha-methyl styrene monomer, and 20 to 90 weight potions of styrene monomer. The range of weight-average molecular weight of the copolymer resin is between 80,000 and 300,000.
Description
Technical field
The present invention relates to high rigidity, high heat-resisting, low suction, high brightness, the light diffusing sheet of high light diffusion and the resin combination that uses therein.
Background technology
The light diffusing sheet with light diffusion permeability that with the resin is main material can obtain uniform lightness plane.Therefore, light diffusing sheet is extensive use of in purposes such as illumination cover, interior lighting formula billboard, transmissive display.In recent years, extend the needs of the light diffusing sheet of the surface light source unit of using as the direct-type backlight of LCD or LCD TV.
In order to bring into play above-mentioned functions better, require light diffusing sheet to light as far as possible not straight line enter and when scattering takes place, suppress the light transmission loss that causes by scattering as much as possible.
In order to obtain to embody the light diffusing sheet that requires characteristic like this, adopted method by in transparent resin, adding mineral-type particles such as lime carbonate, barium sulphate, titanium dioxide, monox, talcum, mica, aluminium hydroxide, magnesium oxide, added the method for partial cross-linked polymer particles such as styrenic polymer particle, acrylic polymers particle, type siloxane polymer beads or, thereby made the method (referring to for example patent documentation 1～3) of light scattering by additive the method for these methods and usefulness.
As the transparent resin that uses in the light diffusing sheet, can enumerate acryl resin, polycarbonate and methyl methacrylate-styrene copolymerized resin, but these resins do not satisfy the rerum natura of thermotolerance, hardness, water absorptivity aspect.In patent documentation 4, disclose the copolymer resins of methyl methacrylate, styrene, α-Jia Jibenyixi, in addition, also disclose and can improve thermotolerance, but for then not record of purposes.
Patent documentation 1: Jap.P. 3195543 communiques
Patent documentation 2: Jap.P. 3195544 communiques
Patent documentation 3: No. 2512544 communiques of Jap.P.
Patent documentation 4: the spy opens flat 4-300908 communique
Summary of the invention
The problem that invention will solve
Recently, in the trial of the characteristics of components that improves LCD or LCD TV, owing to use the light diffusing sheet of acryl resin to have high-hydroscopicity, therefore the warpage when backlight lighting a lamp becomes problem.
In addition, in display uses, because therefore heating backlight requires to be positioned at its light diffusing sheet of just going up and also have thermotolerance.Yet present acryl resin can't satisfy this characteristic.
Because light diffusing sheet is the parts with thickness, if therefore resin mobile higher then is easy to generate the inhomogeneous of thickness.If produce in uneven thicknessly, then can cause brightness irregularities, therefore can't be to the uniform light of image supply.
As mentioned above, present light diffusing sheet can't fully satisfy the function that spreads, hangs down the light diffusing sheet of suction, high rigidity as needs high brightness, high light.
The present invention makes in view of above-mentioned problem, and purpose provides the light diffusing sheet of a kind of high heat-resisting, ultralow suction, high rigidity, high brightness, the diffusion of high light.
Be used to solve the method for problem
The inventor has carried out meticulous research, found that the light diffusing sheet that will contain methyl methacrylate/α-Jia Jibenyixi/styrene copolymerized resin with specific composition and diffusant can realize above-mentioned purpose with the light diffusing sheet that the resin combination moulding obtains, thereby finish the present invention.
The light diffusing sheet resin combination that the present invention relates to, it is characterized in that cooperating and form with copolymer resins with respect to 0.1～2.0 weight portion light diffusing agent of 100 weight portion copolymer resinses, wherein copolymer resins is that weight-average molecular weight is 80000～300000 copolymer resins with the multipolymer of the composition of proportions of 5～40 weight % methyl methacrylate units, 5～55 weight % α-Jia Jibenyixi unit, 20～90 weight % styrene units.
In addition, the present invention relates to light diffusing sheet, it is shaped to the tabular of thickness 0.5～3mm by above-mentioned light diffusing sheet is melt extruded moulding or injection moulding with resin combination.
Light diffusing sheet of the present invention with the manufacture method of the multipolymer that uses in the resin thin compound (being also referred to as copolymer resins) from form and the homogeneity and maintenance good appearance of molecular weight on, the continuous block polymerization or the continuous solution polymerization method of complete hybrid reactor used in expectation, also can be step bulk or solution polymerization.When polymerization, preferably there is initiating agent,, can uses the superoxide and/or the azo-compound that in common free radical polymerization, use as initiating agent.In addition, in order to regulate molecular weight, can also add the such chain-transferring agent of alkyl thiol butane in right amount.After polymerization finishes, carry out processing such as volatilization, granulating, thereby can obtain the copolymer resins that uses in resin combination at light diffusing sheet of the present invention by conventional method.
As the monomer that constitutes this resin, copolymer resins comprises the methyl methacrylate units of 5～40 weight %, preferred 10～35 weight %, the α-Jia Jibenyixi unit of 5～55 weight %, preferred 10～50 weight %, the styrene units of 20～90 weight %, preferred 30～80 weight %.If the ratio deficiency of methyl methacrylate units 5 weight % then are difficult to polymerization, only can obtain the low-molecular-weight body, so difficult forming, if surpass 40 weight %, then have high-hygroscopicity, therefore can become the material that produces warpage.If the ratio deficiency of α-Jia Jibenyixi unit 5 weight %, then thermotolerance is low excessively, if surpass 50 weight %, then is difficult to polymerization, only can obtain the low-molecular-weight body, and is therefore mobile higher, can form plate in uneven thickness.In addition,, only can obtain the low-molecular-weight body if the ratio deficiency of styrene units 20 weight % then are difficult to polymerization, therefore mobile high, can form plate in uneven thickness, if surpass 90 weight %, then pencil hardness and thermotolerance are low excessively.
The molecular weight of copolymer resins is represented with weight-average molecular weight, in 80000～300000 scope.If weight-average molecular weight less than 80000 is then mobile too high, can form plate in uneven thickness.In addition, if weight-average molecular weight surpasses 300000, then flowability is low excessively, so difficult forming.
In addition, the melt flow rate of this copolymer resins can be in the scope of 0.5～2.0g/min.Be preferably 0.5～1.8g/10min.If melt flow rate is higher than 2.0g/10min, then form plate in uneven thickness.If melt flow rate is lower than 0.5g/10min, then flowability is low excessively, so difficult forming.
In addition, dimension card (Vicat) softening temperature of this copolymer resins can be preferably 105～130 ℃ for more than 105 ℃.If 105 ℃ of Vicat softening temperature less thaies, then the thermotolerance to heating backlight reduces, and therefore is easy to generate the distortion of base material etc.
The pencil hardness of this copolymer resins can be for more than the 3H, if not enough 3H, then scratch and surface imperfection become many, are not suitable for use in the material of diffuser plate.
In addition, the water-intake rate of this copolymer resins can be preferably below 0.13% for below 0.15%.If water-intake rate surpasses 0.15%, then can be easy to generate the problem of warpage owing to suction.
As starting monomer, use to comprise methyl methacrylate, α-Jia Jibenyixi and cinnamic raw material.It is the copolymer resins of aforementioned proportion that the usage ratio of these materials should be able to obtain methyl methacrylate units, α-Jia Jibenyixi unit and styrene units, owing on polymerism, have difference, therefore form with respect to the target configuration unit, can use than 5～40 weight % and many methyl methacrylate of a few percent, use than 5～55 weight % and many α-Jia Jibenyixi of a few percent, the styrene of a few percent is lacked in use than 20～90 weight %.In addition, make transparency improve ground and make copolymer resins.
Light diffusing sheet of the present invention can be with respect to 100 parts of (weight portion) copolymer resinses with resin combination, form to exist 0.1～2.0 part, preferred 0.2～1.0 part of light diffusing agent to cooperate.If 0.1 part of combined amount less than, then the disguise of light source is short of, and therefore can become the remarkable uneven light diffusing sheet of brightness of the image that comes from back light.If surpass 2.0 parts, then, therefore can become the light diffusing sheet of luminance shortage owing to see through deficiency in light quantity.
As light diffusing agent, can use known particulate, preferable particle size is partial cross-linked type siloxane aggregated particles, acrylic particle or the lime carbonate of 1～10 μ m.These diffusants can only use a kind, also can use multiple.In addition, as other diffusants, can also and use mineral-type particle or styrenic polymer particles such as barium sulphate, titanium dioxide, monox, talcum, mica, aluminium hydroxide, magnesium oxide, total can not enough all 50 weight % of diffusants.
Copolymer resins can carry out with known method with mixing of diffusant, thereby formed uniform potpourri.Thus obtained light diffusing sheet by melt extruding moulding or injection moulding, is shaped to the tabular of thickness 0.5～3mm with resin combination.If the not enough 0.5mm of thickness then can't guarantee as the intensity with diffuser plate backlight.In addition, if thickness surpasses 3mm, then diffuser plate weight increases, and can't be adapted to maximization, slimming.With its with former state, cut into given size or carry out surface treatment etc., making becomes light diffusing sheet of the present invention.Yet as long as its manufacture method satisfies purpose of the present invention, just there is no particular limitation.
Light diffusing sheet of the present invention just can be made of single layer as long as be made of with resin combination above-mentioned light diffusing sheet, also can be made of the multilayer more than two layers.
Light diffusing sheet of the present invention is by adding a spot of diffusant, can realize rerum naturas such as high heat-resisting, ultralow suction, high rigidity, high brightness, high light diffusion, as long as significantly do not harming in the scope of this purpose, as required, can also use various adjuvants such as anti-live agent, antioxidant, fire retardant, light stabilizer, ultraviolet light absorber, fluorescer.
The invention effect
Light diffusing sheet of the present invention is used for the purposes of requirement light diffused and light transmission type balance, mainly as the direct-type backlight diffuser plate of LCD or LCD TV, especially is accompanied by maximization, is suitable for the purposes of requirement thermotolerance, high rigidity.In addition, by heat-resisting with the light diffusing sheet height that resin combination obtains, the low suction of the light diffusing sheet that the present invention relates to, hardness excellence.
Embodiment
Below, by embodiment the present invention is specifically described, but the present invention is not limited to these embodiment.
Light diffusing sheet carries out by the following method with the mensuration of the rerum natura of the copolymer resins that uses in the resin combination.
(1) molecular weight
Use gel permeation chromatography, measure the weight-average molecular weight of polystyrene conversion.
(2) each unit in the multipolymer is formed
Monomer area by thermal decomposition type gas chromatography is formed than the unit that calculates each monomer.
(3) melt flow rate (MFR)
According to JIS K-7210,, carry out under the 5kg load at 200 ℃.
(4) vicat softening temperature (VST)
Carry out according to JIS K-7206.
(5) pencil hardness
Measure according to JIS K-5401.
(6) water-intake rate
Measure according to JIS K-7209.
The evaluation of physical property of light diffusing sheet carries out by the following method.
(1) total light penetration
B method according to JIS K-7105 is carried out.
(2) light diffusing
With 4 cold-cathode tubes that are spaced of 2cm, secured in parallel light diffusing sheet sample on 10mm, by visual, as the cold-cathode tube of light source do not see through with zero expression, see through with * expression.
(3) brightness irregularities
With 4 cold-cathode tubes that are spaced of 2cm, secured in parallel light diffusing sheet sample on 10mm, by visual, on image even brightness with zero the expression, brightness irregularities with * expression.
In addition, the ellipsis that uses in embodiment and the comparative example has following implication.
MMA: methyl methacrylate
α MSt: α-Jia Jibenyixi
St: styrene
Initiating agent: パ-カ De Star Network ス 12-EB20
Reference example 1～12
Ratio charging feedstock monomer and polymerization initiator with table 1 record; 120 ℃ of temperature of reaction; under 5 hours the delay condition, use the equipment that has connected single grooved complete and volatilization groove to carry out continuous block polymerization, volatilization, granulating, obtain the transparent copolymer resins of target.By 75t make-up machine (Mitsubishi Heavy Industries Ltd's system), under 240 ℃ of resin temperatures with this resin injection moulding, the water-intake rate that obtains vertical 50 * horizontal 75mm * thickness 4mm measure and determination of pencil hardness with the VST mensuration test film of plate, vertical 10 * horizontal 10mm * thickness 4mm.The composition of record gained resin in table 1.In table 1, the starting monomer ratio is MMA/ α MSt/St, and it is MMA unit/α MSt unit/St unit that polymkeric substance is formed.
Table 1
| Reference example | Starting monomer is than (weight % ratio) | Initiating agent (weight %) | Polymkeric substance is formed (weight % ratio) |
| 1 | 7/8/85 | 0.075 | 5/5/90 |
| 2 | 40/41/19 | 0.075 | 40/38/22 |
| 3 | 22/57/21 | 0.075 | 20/50/30 |
| 4 | 22/33/45 | 0.075 | 20/30/50 |
| 5 | 12/12/76 | 0.075 | 10/10/80 |
| 6 | 36/40/24 | 0.075 | 35/34/31 |
| 7 | 0/0/100 | 0.075 | 0/0/100 |
| 8 | 18/0/82 | 0.075 | 20/0/80 |
| 9 | 62/22/16 | 0.075 | 60/17/23 |
| 10 | 10/85/5 | 0.075 | 9/70/21 |
| 11 | 35/65/0 | 0.075 | 37/63/0 |
| 12 | 20/70/10 | 0.075 | 19/62/19 |
In addition, measuring the molecular weight of gained resin and the result of various rerum naturas shown in the table 2.
Table 2
Embodiment 1～3 and comparative example 1～3
Copolymer resins for preparing in the kneading reference example in biaxial extruder and the light powder shown in the table 3 form granular resin combination.The light diffusing sheet that this resin combination is prepared thickness 2mm 220 ℃ of following extrusion moldings.Total light penetration, light diffusing, the brightness irregularities of record gained light diffusing sheet in table 3.Wherein, type siloxane aggregated particles as light diffusing agent is the E-600 (particle diameter 2 μ m) of eastern beautiful ダ ウ コ-ニ Application グ Co., Ltd. system, the acrylic particle is the MX-1000 (particle diameter 10 μ m) of Soken Chemical ﹠ Engineering Co., Ltd.'s system, and lime carbonate is the system CUBE-18BHS (particle diameter 1.8 μ m) of ball tail calcium strain formula society.
Table 3
| Copolymer resins reference example No. | Light diffusing agent | Diffusant addition (phr) | Total light penetration (%) | Light diffusing | Brightness irregularities | |
| Embodiment 1 | 4 | E-600 | 0.15 | 60.9 | ○ | ○ |
| Embodiment 2 | 5 | MX-1000 | 1.5 | 57.9 | ○ | ○ |
| Embodiment 3 | 6 | CUBE-18BHS | 2.0 | 50.2 | ○ | ○ |
| Comparative example 1 | 12 | E-600 | 1.0 | 55.2 | ○ | × |
| Comparative example 2 | 6 | Do not have | 0 | 90.0 | × | × |
Claims (3)
1, light diffusing sheet resin combination, it is characterized in that cooperating 0.1～2.0 weight portion light diffusing agent to form with respect to 100 weight portion copolymer resinses, wherein copolymer resins is that the scope of weight-average molecular weight is 80000～300000 copolymer resins with the composition of proportions of 5～40 weight % methyl methacrylate units, 5～55 weight % α-Jia Jibenyixi unit and 20～90 weight % styrene units.
2, light diffusing sheet resin combination as claimed in claim 1, wherein, light diffusing agent is partial cross-linked type siloxane aggregated particles, acrylic particle or lime carbonate, particle diameter is 1～10 μ m.
3, light diffusing sheet is characterized in that being shaped to the tabular of thickness 0.5～3mm by claim 1 or 2 described light diffusing sheets are melt extruded moulding or injection moulding with resin combination.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101053881A CN101285897A (en) | 2007-04-11 | 2007-04-11 | Light diffusing plate resin composition and light diffusing plate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102483475A (en) * | 2009-09-04 | 2012-05-30 | 住友化学株式会社 | Light-diffusing film, manufacturing method therefor, light-diffusing polarizing plate, and liquid-crystal display device |
| CN104829960A (en) * | 2015-05-08 | 2015-08-12 | 东莞市颖锋光电材料有限公司 | Fabrication method of optical diffusion plate |
| CN107272092A (en) * | 2017-06-30 | 2017-10-20 | 张家港康得新光电材料有限公司 | A kind of warpage preventing diffusion barrier and preparation method thereof |
-
2007
- 2007-04-11 CN CNA2007101053881A patent/CN101285897A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102483475A (en) * | 2009-09-04 | 2012-05-30 | 住友化学株式会社 | Light-diffusing film, manufacturing method therefor, light-diffusing polarizing plate, and liquid-crystal display device |
| CN102483475B (en) * | 2009-09-04 | 2014-05-21 | 住友化学株式会社 | Light-diffusing film, manufacturing method therefor, light-diffusing polarizing plate, and liquid-crystal display device |
| TWI487952B (en) * | 2009-09-04 | 2015-06-11 | Sumitomo Chemical Co | A light diffusion film, a method of manufacturing the same, a light diffusioning polarizing plate, and a liquid crystal display device |
| CN104829960A (en) * | 2015-05-08 | 2015-08-12 | 东莞市颖锋光电材料有限公司 | Fabrication method of optical diffusion plate |
| CN107272092A (en) * | 2017-06-30 | 2017-10-20 | 张家港康得新光电材料有限公司 | A kind of warpage preventing diffusion barrier and preparation method thereof |
| CN107272092B (en) * | 2017-06-30 | 2019-11-08 | 张家港康得新光电材料有限公司 | A kind of warpage preventing diffusion barrier and preparation method thereof |
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Open date: 20081015 |