CN1249461C - Photo diffusion membrane and relative backlight modular - Google Patents
Photo diffusion membrane and relative backlight modular Download PDFInfo
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- CN1249461C CN1249461C CNB031209785A CN03120978A CN1249461C CN 1249461 C CN1249461 C CN 1249461C CN B031209785 A CNB031209785 A CN B031209785A CN 03120978 A CN03120978 A CN 03120978A CN 1249461 C CN1249461 C CN 1249461C
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
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Abstract
The present invention provided a light diffusion sheet capable of enhancing heat resistance, thermal dimensional stability, and weatherability while maintaining transparency and less liable to sag, yellowing or the like, even under heat generated by a lamp or ultraviolet ray irradiation, and to provide a backlight unit which reduces unevenness in luminance using the light diffusion sheet. The light diffusion sheet is provided with a transparent base layer and a light diffusion layer stacked on the front surface of the base layer, and the light diffusion layer contains a light diffusion agent in its binder. The binder is formed from a polymeric composition containing polyol, a minute inorganic filler, and a light stabilizer (a polymeric composition containing polyol having a light stabilizing group and a minute inorganic filler), and the average particle size of the minute inorganic filler is 5 nm to 50 nm.
Description
Technical field
The present invention is relevant with optical diffusion film and related backlight module; And this optical diffusion film has and makes the function that penetrates light diffusion, and is specially adapted to the backlight module of liquid crystal indicator; And this backlight module system uses this optical diffusion film.
Background technology
Now, liquid crystal indicator is comparatively universal with the luminous backlight that makes from liquid crystal back side illuminaton liquid crystal layer; And back lighting devices such as edge light type, vertical-type are housed at the bottom surface side of this liquid crystal layer.Basically, the edge light type backlight module 20 as Fig. 3 (a) is depicted as, its cording is equipped with: fluorescent tube 21, it is wire, and as light source; Light guide plate 22, it is square tabular, and its end is configured along this fluorescent tube 21; Optical diffusion film 23, it is equipped on the face side of light guide plate 22; And prism film 24, it is equipped on the face side of optical diffusion film 23.
Below describe at the function of aforementioned backlight module 20.At first, from the light that fluorescent tube 21 penetrates to light guide plate 22, the reflection spot or the reflectance coating (not shown in the diagram) that can be subjected to light guide plate 22 back sides reflect, and are penetrated by the surface of light guide plate 22 then.Then, can inject optical diffusion film 23 by the light that light guide plate 22 penetrates, and be spread, penetrate by the surface of optical diffusion film 23 then by optical diffusion film 23.Then, can inject prism film 24, and outwards penetrate with the light that is the spike distribution in nearly normal direction via the 24a of prism portion by the light that optical diffusion film 23 penetrates; And the 45a of this prism portion forms in the surface of prism film 24.
As mentioned above, spread by optical diffusion film 23 by fluorescent tube 21 emitted light, again via prism film 24 being spike in nearly normal direction and distributing and to reflect, and then comprehensively shining to liquid crystal layer (not shown in the diagram) of face side.Again, though not shown in the diagram, the face side of prism film 24 more is equipped with optical diffusion film; Its purpose is: reduce the collection characteristics of above-mentioned prism film 24, and the protection prism 24a of portion, and prevent liquid crystal panel such as Polarizer and prism film 24 gluings together.
Shown in Fig. 3 (b), the optical diffusion film 23 of backlight module 20 possesses usually: substrate layer 26, and it is transparent, and made by synthetic resin; Light diffusion layer 27, it is surperficial laminated the forming of substrate layer 26; And gluing prevents layer 28, and back side at substrate layer 26 is laminated forms for it (for example, can open flat 7-5305 communique with reference to the spy, the spy opens 2000-89007 communique etc.).These light diffusion layer 27 aspects are to contain light diffusing agent 30 in binder 29, utilize light diffusing agent 30 to bring into play to make to penetrate the function that light spreads.In addition, prevent from binder 31, to disperse to contain a small amount of bead 32 aspect the layer 28 at gluing, and the bottom of this a small amount of bead 32 protrudes from the back side of binder 31, so can prevent the back side of optical diffusion film 23 and the surperficial driving fit of light guide plate 22, produce and interfere line, and cause puzzlement.
Yet optical diffusion film 23 forms with synthetic resin usually, therefore has the shortcoming that causes distortion or variable color (yellow etc.) easily because of heat or ultraviolet ray etc.On the other hand, light generation source fluorescent tube 21 also can generate heat in luminous.Generally speaking, optical diffusion film 23 near near the fluorescent tube 21, be to be exposed under 80 ℃ to 90 ℃ the temperature.Therefore optical diffusion film 23 can cause thermal deformation, makes partly to present bending, thereby produces the uneven shortcoming of picture.
Thereby developed and improved stable on heating technology (spy opens the 2000-89007 communique), it allows small inorganic filler be to disperse to contain shape and reaches in the binder 29 of the light diffusion layer 27 of optical diffusion film 23; Yet this technology still has following shortcoming: (a) bad dispersibility of small inorganic filler, can't fill a part acquisition thermotolerance, (b) the adaptation deficiency of small inorganic filler and binder 29, both interfaces can produce the gap, cause the penetrability of intensity variation and light to reduce.
Summary of the invention
Because above-mentioned shortcoming the object of the present invention is to provide a kind of optical diffusion film of light and related backlight module; And this optical diffusion film also can improve thermotolerance, heat-resisting dimensional stability and weatherability when keeping height light penetration rate; Even and the also difficult phenomenons such as bending or yellow that produce are shone in heat or the ultraviolet ray of accepting fluorescent tube; And this backlight module system uses this optical diffusion film, and can reduce brightness irregularities and luminance shortage phenomenon.
In order to address the above problem, optical diffusion film of the present invention is to comprise: transparent substrate layer; And overlap at the light diffusion layer on substrate layer surface; This light diffusion layer contains light diffusing agent in adhesive, this adhesive is made of polymkeric substance (Polymer) constituent of polyvalent alcohol (polyol) with small inorganic filler, light stabilizer, and the mean grain size of this small inorganic filler is below the above 50nm of 5nm.
In addition, for addressing the above problem, the present invention also has transparent substrate layer and the light diffusion layer that overlaps on this substrate layer surface, in the adhesive of this light diffusion layer, contain light diffusing agent, and this adhesive is made of the polyvalent alcohol that contains the stable base of light and the polymer composition of small inorganic filler, and the mean particle diameter of the small inorganic filler of this light diffusing sheet is below the above 50nm of 5nm.
What the light diffusion layer adhesive substrate polymer of this optical diffusion film adopted is polyvalent alcohol, and therefore transparency height, and weatherability and processability are all very outstanding.In addition, owing to contain the light stabilizer or the polyvalent alcohol of the stable base of light in the polymer composition of formation adhesive, therefore can prevent from further to promote weatherability by reducing the ultraviolet deterioration that causes.In addition, contain small inorganic filler in the polymer composition, small inorganic filler disperses to add to the thermotolerance that can improve light diffusion layer in the adhesive more.Because for promoting mean particle diameter that this thermotolerance disperses the small inorganic filler that adds below the above 50nm of 5nm, this diameter is also littler than wavelength of visible light, so can keep the transparency of light diffusion layer.In such event, this optical diffusion film is able to bending, the yellow problem that nearly step minimizing is caused because of heat, ultraviolet ray etc., and can prevent because of adding the light penetration rate decline problem that small inorganic filler causes.
More overlapped to cohere at the back side of above-mentioned substrate layer and prevented layer, this gluing prevents that layer from being to disperse to contain bead in adhesive, this adhesive contains polyvalent alcohol and small inorganic filler, the polymer composition of light stabilizer by (a) or the polyvalent alcohol that (b) contains the stable base of light is constituted with the polymer composition that contains small inorganic filler, and the mean particle diameter of this small inorganic filler is at the above 50nm of 5nm.Utilize this method, can keep in the same manner with above-mentioned light diffusion layer and cohere the transparency that prevents layer, simultaneously also can improve against weather and thermotolerance, its result is, this optical diffusion film and can suppress bending and yellow when keeping the transparency.
Above-mentioned light stabilizer is fit to use hindered amine (hinderedamine) class light stabilizer.Hindered amine light stabilizer is very high because of aforesaid UV stable function, and continuation is also high, therefore more can further promote the permanance and the weatherability of this optical diffusion film.
With regard to above-mentioned small inorganic filler, can adopt its surface fixing the small inorganic filler of organic polymer.And " fix " in this what is called, be not the finger meaning or adhere to only, and refer between organic polymer and small inorganic filler, produce the meaning of chemical bond; Therefore after with the small inorganic filler of any solvent wash, in cleansing solution, also can't detect organic polymer.Therefore, as use the surface fixing the small inorganic filler of organic polymer, then the substrate polymer to the formation binder has good affinity, can form to have the good light diffusion layer of the rerum natura of filming; And this rerum natura of filming comprises skin hardness, thermotolerance, wearing quality, weatherability, stain resistance etc.
In the small inorganic filler of organic polymer in said fixing, can comprise following alcoxyl (alkoxy) base of the above 50mmol/g of 0.01mmol/g.Allow and be fixed in the alkoxy that contains this degree in the organic polymer on the small inorganic filler, then can bring following result: promote the affinity between small inorganic filler and matrix (matrix) substrate polymer, and improve the dispersiveness of the small inorganic filler in substrate polymer.
Contain hydroxyl in the above-mentioned organic polymer, and above-mentioned polymer composition can comprise from multi-functional isocyanates (isocyanate) compound, melamine (melamine) compound, and amino plastics (aminoplast) resin one or more the thing selected.These means of seeing through can make organic polymer and adhesive base-material because of the combination of bridge formation structure, and provide the rerum natura of filming good filming; And this rerum natura of filming comprises preservation stability, stain resistance, flexible, weatherability etc.And this organic polymer is fixed on the small inorganic filler surface.
Also can have loop chain alkyl (cyclo-alkyl) in the above-mentioned polyvalent alcohol.Use contains the polyvalent alcohol of loop chain alkyl as substrate polymer, can improve the repellency (repelling water-based, water tolerance) of adhesive, can improve anti-curved flexible, the dimensional stability of this optical diffusion film under hot and humid condition.In addition, also can improve the hardness, weatherability variability, solvent resistance of light diffusion layer etc., promote the key property of filming.And can improve the compatibility that the surface is fixed with the small inorganic filler of organic polymer, and small inorganic filler is dispersed uniformly.
Rigidizer in the above-mentioned polymer composition can add fats isocyanates (isocyanate).Rigidizer contained in the polymer composition adopts the fats isocyanates, can prevent that light diffusion layer or gluing from preventing a layer yellow.
Therefore, utilizing the dispersion light that light gave out, and it is guided in the lip-deep back light for liquid crystal display device module, the optical diffusion film that is possessed, just can reduce optical diffusion film as mentioned above because heat with ultraviolet ray the problem of the bending that deforms, yellow, suppress the problem of liquid crystal indicator brightness irregularities and brightness deterioration.
Description of drawings
Fig. 1: implement to be used for the medelling sectional view of display light diffusion barrier in the kenel of the present invention one.
Fig. 2: the medelling sectional view of the optical diffusion film of different kenels with Fig. 1.
Fig. 3 (a): the medelling stereographic map of general edge light type backlight module.
Fig. 3 (b): the medelling sectional view of general optical diffusion film.
Embodiment
Below with reference to suitable accompanying drawing, be described at enforcement kenel of the present invention.
The optical diffusion film 1 of Fig. 1 possesses: substrate layer 2; And light diffusion layer 3, it is surperficial laminated the forming of substrate layer 2.
Owing to must allow the cause of light penetration, so substrate layer 2 is formed by water white synthetic resin particularly by transparent.The synthetic resin that can be used for this substrate layer 2 there is no particular restriction, for example, can use polyethylene terephthalate (polyethylene terephthalate), poly-second how (polyethylene naphthalate), acrylic acid (acrylic) resin, polycarbonate (polycarbonate), polystyrene (polystyrene), polyene (polyolefine), acetate fiber (cellulose acetate), weatherability variability vinyl chloride etc.Wherein best the is transparency is outstanding, intensity is high polyethylene terephthalate (polyethylene terephthalate), as for the polyethylene terephthalate (polyethylene terephthalate) that improves bending property then better.
The thickness of substrate layer 2 (average thickness) there is no particular restriction, for example, maintains the above following scope of 500 μ m of 10 μ m, wherein to be good below the 250 μ m more than the 35 μ m, especially with the most desirable below the 188 μ m more than the 50 μ m., then when carrying out the smearing of resin combination, form easily and curl less than above-mentioned scope as the thickness of substrate layer 2, can cause inconvenience such as constructional difficulties; And this resin combination is to be used to form light diffusion layer 3.Relative, surpass above-mentioned scope as the thickness of substrate layer 2, the brightness of liquid crystal indicator is reduced, and make the thickness of backlight module become big, and violate the demand of the slimming of liquid crystal indicator.
Light diffusing agent 5 can spread the particle of light, and it can generally be divided into organic filler and inorganic filler.Particularly, inorganic filler has: silicon dioxide, aluminium hydroxide, aluminium oxide, zinc paste, barium sulphide, magnesium silicate, in addition, also available its potpourri.Particularly, organic filler has: acryl resin, acrylonitrile resin, poly-ammonium ester, Polyvinylchloride, polystyrene, polyacrylonitrile, polyamide.Wherein, be good with acryl resin, the most desirable with the poly-methyl esters (PMMA) of polymethyl especially.
The shape of light diffusing agent 5 there is no particular restriction, for example, and spherical, needle-like, bar-shaped, spindle shape, tabular, flakey, fibrous etc.Wherein, the bead with the light diffusing excellence is good.
The lower limit in the averaged particles footpath of light diffusing agent 5 is with 1 μ m or 2 μ m, and even 5 μ m are good; And the upper limit in the averaged particles of light diffusing agent 5 footpath is with 50 μ m or 20 μ m, and even 15 μ m are good.Its reason is, less than above-mentioned scope, then light diffusing agent 5 formed light diffusion layers 3 surfaces is concavo-convex less, and the anxiety that can't reach the required light diffusing of optical diffusion film is arranged as the averaged particles footpath of light diffusing agent 5; Relative, directly surpass above-mentioned scope as the averaged particles of diffusant 5, then the thickness of optical diffusion film 1 increases, and makes the homogeneous diffusion difficulty that becomes.
These substrate layer 2 employed synthetic resin are not particularly limited, and can use polyethylene terephthalate (polyethylene terephthalate), poly-second how (polyethylene naphthalate), acrylic acid (acrylic) resin, polycarbonate (polycarbonate), polystyrene (polystyrene), polyene (polyolefine), acetate fiber (celluloseacetate), weatherability variability vinyl chloride etc.Wherein best is the polyethylene terephthalate (polyethylene terephthalate) that the transparency is outstanding, intensity is high, flexible performance polyethylene terephthalate (polyethylene terephthalate) the best through improving.
The thickness of substrate layer 2 (average thickness) does not have special restriction.For example below the above 500 μ m of 10 μ m also can, preferably below the above 250 μ m of 35 μ m, above 188 mu m range the bests of 50 μ m especially.The thickness of substrate layer 2 is not as reaching above-mentioned scope, will coat resin combination in the time of constituting light diffusion layer 3 and just be easy to the situation of curling, and problems such as difficult treatment can take place.On the contrary,, then may cause the brightness of liquid crystal indicator to reduce, or backlight module thickness increases, violated liquid crystal indicator and pursued frivolous principle if the thickness of substrate layer 2 surpasses above-mentioned scope.
Light diffusing agent 5 can be divided into inorganic filler and organic filler greatly for having the particle of the linear matter of energy diffusion light.Inorganic filler particularly can be used silicon, aluminium hydroxide, aluminium oxide, zinc paste, barium sulphide (batrium), magnesium silicate (magnesium silicate), or the potpourri of above-mentioned substance.Concrete organic filler material has acrylic acid (acrylic) resin, vinyl cyanide (acrylonitrile) resin, polyurethane (polyurethane), Polyvinylchloride, polystyrene (polystyrene), polyacrylonitrile (polyacrylonitrile), polyamine (polyamide) etc., wherein preferably adopt (PMMA) the best of the transparency very high acryl resin, especially polymethylene methacrylate (polymethyle methacrylate).
There is no particular restriction for the shape of light diffusing agent 5.Spherical, cubic, needle-like, bar-shaped, spindle shape, tabular, forest tract shape, fibrous etc. all can, wherein the good spherical particle of second light diffusing is good.
Be limited to 1 μ m under the mean particle diameter of light diffusing agent 5, especially with 2 μ m, even 5 μ m are good.Be limited to 50 μ m on the mean particle diameter of light diffusing agent 5, especially with 20 μ m, even 15 μ m are good.When the mean particle diameter of light diffusing agent 5 did not reach above-mentioned scope, the concave-convex surface of light diffusing agent 5 formed light diffusion layers 3 can diminish, and possibly can't satisfy the required light diffusing function that possesses of light diffusing sheet.Otherwise when exceeding above-mentioned scope as the mean particle diameter of light diffusing agent 5, then the thickness of optical diffusion film 1 can increase, and is difficult to spread equably.
The following of the addition of light diffusing agent 5 (to solid part conversion addition of 100 parts of substrate polymers in the material-polymer composition that forms adhesive 4) is limited to 10 parts, preferably at 20 parts, even 50 parts.Be limited to 500 parts on the addition of light diffusing agent 5, especially with 300 parts, even 200 parts be good.When the addition of light diffusing agent 5 did not reach above-mentioned scope, light diffusing can be not enough, and on the other hand, when the addition of light diffusing agent 5 surmounted above-mentioned scope, then the effect of fixed light diffusant 5 can reduce.In addition, as use light diffusing sheet for being configured in lip-deep go up of prismatic glasses because must very high light diffusing, thus the addition of light diffusing agent 5 only need be preferably in more than 10 parts below 30 parts more than 10 parts below 40 parts.
Adhesive 4 is with build bridge sclerosis and forming of polymer composition.This polymer composition contains polyvalent alcohol, small inorganic filler and light stabilizer, and other also adds rigidizer, plasticizer, spreading agent, charged preventor, various adjustment agent, ultraviolet light absorber, antioxidant, stickiness modification agent, lubricant etc. in right amount.Binder 4 therefore must be for transparent owing to allowing light penetration, and water white transparency is good especially.
Polyvalent alcohol can form the processability height, can form light diffusion layer 3 easily through modes such as Tu Gong.In addition, small inorganic filler is distributed in the adhesive 4, can improve the thermotolerance of light diffusion layer 3 even optical diffusion film 1, reduces flexural deformation.And contain light stabilizer in the formation material-polymer composition of adhesive 4, therefore contained light stabilizer can allow ultraviolet ray produce the effect desactivation (decomposition, seizure etc.) of free radical, active oxygen in the adhesive 4, can lower light diffusion layer 3 even this optical diffusion film 1 because of deterioration situation that ultraviolet ray produced.
Light stabilizer is fit to adopt the light stabilizer of hindered amine (hinderedamine) class.Hindered amine light stabilizer has highly stable function to above-mentioned ultraviolet ray, and the persistence height, therefore can further improve the permanance and the weatherability variability of this optical diffusion film 1.
Aforesaid polyvalent alcohol, can use the single amount body composition that contains the unsaturated single amount body of hydroxy to overlap and polyvalent alcohol, under the superfluous condition of hydroxy the polyester polyol (Polyester polyol) of gained, or separately or will mix more than 2 kinds and use.
Contain the unsaturated single amount body of hydroxy (a) acrylic acid (acrylic) 2-hydroxyl (hydroxy) is arranged, acrylic acid 2-hydroxy propylene (hydroxypropyl), isobutylene (methacryl) 2-hydroxyl, isobutylene 2-hydroxy propylene, allyl alcohol (allyl alchol), class allyl alcohol (homo allyl alchol), silanol (silica alchol), butenol (crotonil alchol) etc. contains unsaturated single amount body of hydroxy, (b) ethene dihydroxy alcohol, ethylene oxide, the propylene dihydroxy alcohol, propylene oxide, the butylene dihydroxy alcohol, butene oxide, 1,4-Bis (methyl hydroxy) Cyclohexane, Phenil Glycidil ether; , Glycidil Decanoete, PragcelFM-1 divalent ethanol or epoxy compounds such as (Daisel chemical industry Co., Ltd. systems), and the unsaturated single amount body etc. that contains hydroxy as acrylic acid, Methacryl acid, Malein acid, Humal acid, Croton crotonic acid, Itacon acid etc. and unsaturated carbon acid reaction gained.Unsaturated single the measuring that can contain hydroxy when the manufacturing polyvalent alcohol from these selects to overlap more than a kind or 2 kinds manufacturing body.
Also can be from the acrylic acid ethyl, acrylic acid n-propyl, the acrylic acid isopropyl, acrylic acid n-butyl, acrylic acid tert-butyl, acrylic acid ethyl hexil, Methacryl acid ethyl, Methacryl acid n-propyl, Methacryl acid isopropyl, Methacryl acid n-butyl, Methacryl acid tert-butyl, Methacryl acid ethyl hexil, Methacryl acid glycidil, Methacryl acid cyclohexane, polystyrene, vinyltoluene, 1-methylstylene, acrylic acid, methacryl acid, acrylonnitrile, the vinyl acetate base, propyon acid vinyl, stearic acid glycerine (acid) vinyl, the acetic acid allyl, adipin acid dialyl, itacon acid dialyl, malein acid dietyl, vinyl chloride, acrylicamid, N-Metylol acrylicamid, N-putoxy methyl acrylicamid, diaceton acrylicamid, ethylene, propylene, select in the middle of the Isopropylene etc. the unsaturated single amount body of ethene more than a kind or 2 kinds with from aforesaid (a) with (b) in the middle of select contain the unsaturated incompatible manufacturing polyvalent alcohol that singly weighs sb. of hydroxy.
This coincidence contains the mean molecular weight of polyvalent alcohol of single amount body composition gained of the unsaturated single amount body of hydroxy more than 1000 below 500000, preferably more than 5000 below 100000.In addition, this hydrogen-oxygen base price is more than 5 below 300, preferably more than 10 below 200, even more than 20 below 150.
The Polyester polyol that is obtained under the superfluous condition of hydroxy can be by (c) ethene dihydroxy alcohol, the diethylene dihydroxy alcohol, the propylene dihydroxy alcohol, the dipropylene dihydroxy alcohol, 1,3-butandiol, 1,4-butandiol, 1,5-butandiol, the neopentyl dihydroxy alcohol, the cyclohexane dihydroxy alcohol, the decamethylene dihydroxy alcohol, 2,2,4-trimethyl-1,3-petanediol, trimethylolpropane, hexanetriol, glycerine, penterislytol, cyclohexanediol, add water bisphenolA, bis (hydrox methyl), cyclohexane, hydroxynonbis (Hydroxyethyl ether), Tris (hydroxy ether) isoxynulate, multivalence ethanol and (d) Malein acid such as xyrilene dihydroxy alcohol, Humal acid, kohaku acid, adipin acid, cebatin acid, azeline acid, trimet acid, terehutal acid, hutal acid, many chloros acid such as isohutal acid etc. add propanediol, hexanediol, the polyethylene dihydroxy alcohol, hydrogen radix in the multivalence ethanol such as trimethylol propane reacts manufacturing under than the more condition of the aforesaid chloro of manying Carbonxil radix.
The mean molecular weight of the polyester polyol of gained is more than 500 below 300000 under the superfluous condition of this hydroxy, preferably more than 2000 below 100000.In addition, its hydrogen base price is more than 5 below 300, preferably more than 10 below 200, even is preferably in more than 20 below 150.
Polyvalent alcohol as the polymkeric substance of this polymer composition base material, be to overlap by above-mentioned polyester polyol (polyesterpolyol) and the above-mentioned single amount body composition that contains the unsaturated single amount body of hydroxy to form, and preferably have the Acrylic polyol of (meta) acrylic unit etc.Is that the made adhesive of substrate polymer (binder) 4 has good weatherability variability with this polyester polyol (polyester polyol) with acrylic polyol (acrylic polyil), can reduce the situation that yellow takes place light diffusion layer 3.In addition, can use any in polyester polyol and the acrylic polyol, or both use all and all can.
In addition, above-mentioned polyester polyol and the hydroxy number in the acrylic polyol, as long as each molecule is at 2 when above and need not special restriction, but when the hydrogen-oxygen base price in the solid composition 10 when following, counting of building bridge can reduce, and can reduce the physical property of coating films such as solvent resistance, water tolerance, thermotolerance, skin hardness.
Above-mentioned polyvalent alcohol (polyol) also can use the polyvalent alcohol with cycloalkanes (cycloalkyl) base.Therefore this polyvalent alcohol, can improve the repellency (repelling water-based, water tolerance) of binder 4 because naphthenic base is imported in the polyvalent alcohol that constitutes adhesive 4, can improve anti-curved flexible, the dimensional stability of this optical diffusion film under hot and humid condition.In addition, also can improve the hardness, weatherability variability, solvent resistance of light diffusion layer etc., promote the key property of filming.
Polyvalent alcohol with above-mentioned naphthenic base can overlap acquisition altogether with the unsaturated single amount body of the repeatability with naphthenic base (a).The unsaturated single amount body of repeatability (a) with naphthenic base is meant the unsaturated single amount body of the repeatability that has 1 naphthenic base in molecule at least.This unsaturated list of repeatability with naphthenic base is measured body, and there is no particular restriction, but preferably the unsaturated list of the repeatability shown in following general expression (1) is measured body.This single amount body can use separately, also can more than 2 kinds and use.
In above-mentioned general expression (1), R
1For hydrogen atom or contain the hydrocarbon base of carbon number 1 or 2.Z is the epoxy radicals that can have sub stituent, have carbon number 1～36.There is no particular restriction for the above-mentioned hydrocarbon base that has carbon number 1 or 2, can use methyl (Methyl) or ethyl (ethyl) etc.
Above-mentioned sub stituent is not particularly limited, and hydrocarbon base that for example contains carbon number 1～18 etc. all can.The above-mentioned hydrocarbon base that contains carbon number 1～18 does not also have special restriction, for example, methyl, ethyl, n-pro-pyl, isopropyl, normal-butyl, isobutyl, tert-butyl, amyl group, hexyl, heptyl, octyl group, nonyl, decyl, undecyl, dodecyl, tritriacontyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl etc.
Above-mentioned naphthenic base there is no particular restriction, for example, cyclobutyl, cyclopentyl, cyclohexyl, suberyl, ring octyl group, ring nonyl, ring decyl, ring undecyl, ring dodecyl, ring tritriacontyl, ring tetradecyl, ring pentadecyl, ring hexadecyl, ring heptadecyl, ring octadecyl etc.
There is no particular restriction for the unsaturated single amount body of repeatability shown in the above-mentioned general expression (1) (a), and cyclohexyl methacrylate, methyl methacrylate base cyclohexyl, methacrylic acid tertiary butyl cyclohexyl, methacrylic acid ring ten diester are arranged for example.
The common coincidence ratio of the above-mentioned unsaturated single amount body of the repeatability that has an epoxy radicals (a) is below the above 97.9 quality % of 5.0 quality %, preferably below 80.0 quality % more than the 5.0 quality %, even the above 70.0 quality % of 10.0 quality % following be good.When the common coincidence ratio of the unsaturated single amount body of the repeatability that has epoxy radicals (a) is lower than above-mentioned scope, key propertys such as the hardness of possibly can't improve filming, gloss, and the polyvalent alcohol that overlaps altogether with the unsaturated single amount body of repeatability (a) also possibly can't form and have that highly weatherability is variational films.On the other hand, when the common coincidence ratio of the unsaturated single amount body of the repeatability that has epoxy radicals (a) exceeds above-mentioned scope, with polyvalent alcohol that the unsaturated single amount body of repeatability (a) overlaps altogether in, overlap the effect that is produced altogether with the unsaturated single amount body of the repeatability that has epoxy radicals (a), and close the effect that is produced with unsaturated singly the weighing sb. of other repeatability, each other may balance.
There is no particular restriction for the inorganics that constitutes small inorganic filler, preferably inorganic oxide.This inorganic oxide is defined as, and is that main oxygen atom combines the various oxygen metal compounds that the network structure that forms 3 dimensions constitutes with metallic element.In addition, on the metallic element that constitutes inorganic oxide, preferably use the element of selecting in period of element Table II～VI family, better choice is the element of selecting from period of element Table III～V.Interim, especially with Si, Al, selected element is good among Ti and the Zr.The colloid silicon of metallic element Si (colloidal silica) is best in the effect that promotes on thermotolerance and the light penetration.The shape of small inorganic filler can be a shape of particle arbitrarily such as spherical, needle-like, tabular, forest tract shape, broken shape, and there is no particular restriction.
Be limited to 5nm under the mean particle diameter of small inorganic filler, preferably at 10nm.On the other hand, be limited to 50nm on the mean particle diameter of small inorganic filler, preferably at 25nm.When the mean particle diameter of small inorganic filler did not reach above scope, the surface energy of small inorganic filler can uprise, and is easy to generate aggegation etc., otherwise, when surpassing above scope, can be subjected to short wavelength's influence and gonorrhoea takes place, be difficult to fully keep the transparency of optical diffusion film 1.
To 100 parts of the substrate polymers of polymer composition, the lower limit of the addition of small inorganic filler (the solid conversion addition that has only inorganic composition) is preferably 5 parts, is good with 50 parts especially.The upper limit of the aforementioned addition of small inorganic filler is preferably 500 parts, is good with 200 parts especially, and 100 parts then better.This be because, when the addition of small inorganic filler when not reaching above-mentioned scope, can't fully prevent the thermal deformation of optical diffusion film 1, otherwise, just be difficult to add in the polymer composition when surpassing aforementioned range, may reduce the light penetration rate of light diffusion layer 3.
Small inorganic filler can use the surface that the fixing material of organic polymer is arranged.Use has the fixing small inorganic filler of organic polymer, can improve in the adhesive 4 dispersiveness with the compatibility of adhesive 4.The molecular weight of organic polymer, shape, composition, there is no particular restriction to have or not functional group etc., can use any organic polymer.Arbitrary shapes such as the shape of organic polymer also can use straight chain shape, it is dendritic to divide, bridge formation structure.
Particularly, constitute the resin of above-mentioned organic polymer, for example have: the polyester and the various copolymer thereof of the polyalkenes hydrocarbon of methacrylic resin, polystyrene, polyvinyl acetate, tygon or polypropylene etc., Polyvinylchloride, vinylidene chloride, polyethylene terephthalate etc., or at the resin of functional group upper part sex change such as amino, epoxy radicals, hydroxyl, carboxyl.Wherein, with the metha crylic resin that contains methacrylic acid unit, methacrylic acid-phenylethylene resin series, methacrylic acid-polyester based resin etc., because of having the formation of filming, so the most suitable; On the other hand, the resin that has intermiscibility with the substrate polymer-polyvalent alcohol of above-mentioned polymer composition is also fine, therefore preferably contains identical composition person with contained polyvalent alcohol in the polymer composition for good.
Small inorganic filler also can include organic polymer in the particle.Thus, just can in the core inorganics of small inorganic filler, give the pliability and the toughness of appropriateness.
Also can add in the above-mentioned organic polymer and contain the basic material of alcoxyl (Alkoxy), its addition is the small inorganic filler that is fixed on the organic polymer, and every 1g adds below the above 50mmol of 0.01mmol.Because the effect of alkoxy can improve and constitute the compatibility of the matrix resin of adhesive 4, and be lifted at the dispersiveness in the adhesive 4.
The alkoxy of indication is the RO base that combines with the metallic element that forms the particulate bone herein.The R here is replaceable alkoxy, and the RO base in the particulate can be adopted same substance and also can be different material.The concrete example of R comprises methyl, ethyl, n-pro-pyl, isopropyl, normal-butyl etc.
In the small inorganic filler that is fixed with organic polymer, there is no particular restriction for the containing ratio of organic polymer.With small inorganic filler is benchmark, preferably more than 0.5 quality %, below the 50 quality %.
As mentioned above, the organic polymer that is fixed in small inorganic filler can use has hydroxyl, and comprises at least a for good among the following three: multi-functional isocyanate compound, melamine compound and amino resin; And this multi-functional isocyanates comprises the functional group more than two, and it reacts with hydroxyl in the polymer composition that constitutes adhesive 4.Thus, the binder resin of small inorganic filler and adhesive 4 has good preservation stability, stain resistance, flexible, weatherability, preservation stability etc., and can obtain to have filming of gloss with the combination of bridge formation structure.
Above-mentioned multi-functional isocyanate compound for example has: aliphatics, alicyclic, aromatic series and other multi-functional isocyanate compound or its denaturing compounds.The concrete example of multi-functional isocyanate compound has: toluene support diisocyanate, xylylene diisocyanate, '-diphenylmethane diisocyanate, hexanediol diisocyanate, isophorone diisocyanate, lysinediisocyanate, 2,2,4-trimethyl cyclohexane diisocyanate, methylcyclohexane diisocyanate, 1, three amount bodies of the biuret body of 6-hexamethylene diisocyanate, different hydrogen urea ester body etc. etc.; The remaining compounds that two above isocyanates are arranged that polyol reaction produced such as this multi-functional isocyanates and propylene glycol, hexanediol, polyglycol, trimethylolpropane; And this multi-functional isocyanate compound blocks the multi-functional isocyanate compound of blockade type of back generation etc. with following blockade agent.And this blockade agent has: alcohols, as ethanol, hexanol etc.; Compound contains the phenol hydroxy as phenol, cresols etc.; The oxime oximes is as second vinegar acetate, methyl ethyl ketone oxime; Interior vinegar amine is as ε-Caprolactam, γ-Caprolactam etc.In addition, above-mentioned multi-functional isocyanate compound also can use one or two or more kinds to use with.Wherein, in order to prevent the generation yellow of filming, be good to adopt the multi-functional isocyanate compound of no yellow sex change, this multi-functional isocyanate compound does not contain the isocyanate group that directly combines with aromatic rings.
Above-mentioned melamine compound for example has: dihydroxymethyl melamine, trimethylol melamine, tetra methylol melamine, pentamethylol melamine, hexamethylolmelamine, isobutyl alcohol ether type melamine, normal butyl alcohol ether type melamine, butylation benzoguanamine etc.
Above-mentioned amino resin for example has: alkyl etherify melamine resin, urine fat resin, benzoguanamine etc.; Can use the monomer of above-mentioned amino resin or two or more potpourri or cocondensation compounds.And this alkyl etherify melamine resin is that the amine triazine is carried out methylolation, implements the alkane etherificate with the alkanol of cyclohexanol or carbon number 1～6 and is obtained; And wherein representative person has: butyl ether melamine resin, methyl etherified melamine resin, first butyl mixing melamine resin.In addition, in order to promote sclerosis, also can use sulfonic acid is catalyst, for example, and p-toluenesulfonic acid and amine salt etc.
In addition, also can contain isocyanates in the polymer composition and be used as rigidizer.Owing to contain isocyanate hardener in the polymer composition, form more strong bridge formation structure, therefore more can promote the physical property of filming of light diffusion layer 3.And this isocyanates can use and the identical material of above-mentioned multi-functional isocyanate compound; Wherein, be good with the fatty family isocyanates that uses the yellow that to prevent to film especially.
In addition, also can be in polymer composition mixing charged preventor.Utilizing mixingly has the polymer composition of charged preventor to form adhesive 4, then can find to have in this optical diffusion film 1 to prevent charged effect, can prevent to adsorb dust, be difficult to overlappings such as prismatic glasses etc. because of variety of problems that static produced.As smearing charged preventor from the teeth outwards, then can cause the surface to become glutinous or dirty, as mixing charged preventor in polymer composition, then can reduce above-mentioned shortcoming.This charged preventor there is no particular restriction, and can use negative ion as alkyl sulfate, alkyl phosphoric acid salt compound etc. is that kations such as charged preventor, the 4th ammonium salt, imidazolinium compounds are that the nonionic of charged preventor, polyethenol series, polyoxyethylene shrink D-sorbite monostearate, ethanolamines etc. is macromolecular charged preventor of charged preventor, polyacrylic acid etc. etc.Be that charged preventor is good to use the charged bigger kation of effect that prevents especially wherein, add to bring into play on a small quantity preventing charged effect.
Next the manufacture method of this optical diffusion film 1 is described.The manufacture method of this optical diffusion film 1 has: (a) mixed light diffusant 5-makes the manufacturing engineering of light diffusion layer with baste in constituting the polymer composition of adhesive 4, (b) light diffusion layer is spread upon with baste on the surface of substrate layer II-engineering of overlapping light diffusion layer 3.
The optical diffusion film 11 of Fig. 2 has substrate layer 2, overlaps at these substrate layer 2 lip-deep light diffusion layers 3, and cohere (sticking) that overlap at substrate layer 2 back sides prevents layer 12.Because this substrate layer 2 is identical with aforesaid optical diffusion film 1 with light diffusion layer 3, therefore only give identical numbering, omit its explanation.Therefore, this optical diffusion film 11 is maintained the transparency, also can improve its weatherability variability and thermotolerance simultaneously.
Cohere and prevent that layer 12 has adhesive (binder) 13, and be dispersed in the bead 14 in the adhesive 13.This adhesive 13 also is through building bridge sclerosis and forming by the polymer composition (polymer composition that has just comprised polyvalent alcohol, small inorganic filler and light stabilizer) identical with the adhesive 4 of above-mentioned light diffusion layer 3.In addition, the material of bead 14 adopts is light diffusing agent 5 same materials with light diffusion layer 3.In addition, this coheres the thickness (deduction bead 14 outer adhesives 13 thickness partly) that prevents layer 12 and there is no particular restriction, can maintain the above following scope of 10 μ m of 1 μ m.
The addition of this bead 14 is less, and bead 14 is separated from each other, and is scattered in the adhesive 13, has the lower end of many beads 14 to protrude in adhesive 13 a little.Therefore, when this optical diffusion film 11 overlapped on light guide plate, outstanding bead 14 lower ends will contact with light guide plate etc., and the optical diffusion film 11 whole back sides just can not touch light guide plate etc.In such event, just can prevent optical diffusion film 11 and light guide plate gluing, also can lower the problem of liquid crystal indicator picture brightness inequality.
Because cohering in the polymer composition that prevents layer 12 adhesive 13 in formation, this optical diffusion film 11 also contains small inorganic filler, therefore can further improve the physical property that the thermotolerance, mar proof, weatherability variability, stain resistance etc. of optical diffusion film 11 are filmed, suppress buckling problem more.In addition, also contain light stabilizer in the polymer composition of aforementioned formation adhesive 13, therefore also more can promote permanance and weatherability variability.
The manufacture method of optical diffusion film 11 then is described.The manufacture method of this optical diffusion film 11 comprises (a) manufacturing engineering that the mixed light diffusant-manufacturing light diffusion layer purposes is smeared liquid in the polymer composition that constitutes adhesive 4, (b) smear this light diffusion layer baste, overlapping light diffusion layer 3 engineerings on substrate layer 2 surfaces, (c) in constituting the polymer composition of adhesive 13, mix bead 14-and make and prevent the manufacturing engineering of gluing layer with baste, and (d) smear at substrate layer 2 back sides this cohere prevent layer with baste, overlapping to cohere prevents layers 12 overlapping engineering.
Therefore, possessing lamp, light guide plate, light diffusing sheet, prismatic glasses etc., the light that lamp sent can be distributed in the lip-deep back light for liquid crystal display device module, use aforementioned lights diffusion barrier 1,11 as optical diffusion film, because this optical diffusion film 1,11 have coating film physical propertys such as very high thermotolerance, weatherability variability, therefore even tan by the sun under the heating of light or outside ultraviolet ray irradiation, also be not easy to deform and problem such as yellow, also just can reduce the problem that liquid crystal indicator picture brightness inequality, brightness reduce.
The example of optical diffusion film of the present invention does not limit above-mentioned example, can not add light stabilizer in the polymer composition that forms adhesive yet, or contains the polyvalent alcohol that the stable base of light is arranged when containing light stabilizer yet.Thus, in the polyvalent alcohol that constitutes adhesive, add the stable base of light inlet, also can make problems such as free radical, active oxygen that ultraviolet ray caused because existing light stabilizer and desactivation (decompose, catch) can reduce light diffusion layer even this light diffusing sheet problem because of UV degradation in the binder.
Above-mentioned polyvalent alcohol with the stable base of light is to be overlapped jointly and got by the unsaturated single amount body of repeatability (b) with the stable base of light.This unsaturated single amount body of repeatability (b) with the stable base of light is meant the unsaturated single amount body of the repeatability that has the stable base of 1 light in the molecule at least.Under this light stabilizer overlapped with the unsaturated single amount body of repeatability (b) is common, the stable base of light can combine with the resin matrix of polyvalent alcohol, can suppress to contain the stable basic composition of light and ooze out from light diffusion layer.Therefore in light diffusion layer, can bring into play light constantly and stablize the effect that base prevents deterioration, improve weatherability.
There is no particular restriction to measure body (b) for the aforementioned unsaturated list of repeatability with the stable base of light.Preferably have the unsaturated single amount body of repeatability of pepper element (Piperidinil) the base structure that contains the nitrogen-atoms that is subjected to steric hindrance, can use separately, also can more than 2 kinds and use.Also not limiting especially at this must be the aforementioned unsaturated list amount of repeatability body with the plain base structure of the pepper that contains the nitrogen-atoms that is subjected to steric hindrance, the plain base of the pepper that preferably can use this nitrogen-atoms to combine with 2 fourth stage carbon atoms at least.
There is no particular restriction to measure body for the above-mentioned unsaturated list of repeatability with the plain base structure of the pepper that contains the nitrogen-atoms that is subjected to steric hindrance, can use the unsaturated single amount body of the repeatability shown in the plain basic inductor of pepper, the following note general expression (2).
In above-mentioned general expression (2), R
2Represent hydrogen atom or cyano group.R
3With R
4Can be identical or different, represent hydrogen atom or contain the hydrocarbon-based of carbon number 1 or 2.X
1Be oxygen atom or imino group.Y
1Represent hydrogen atom, contain the hydrocarbon-based of 1～18 carbon number, or-CO-CR
5=CHR
6R
5With R
6Can be identical or different, represent hydrogen atom or contain the hydrocarbon-based of carbon number 1 or 2.There is no particular restriction for the above-mentioned hydrocarbon-based that contains carbon number 1 or 2 and the aforementioned hydrocarbon-based that contains carbon number 1～18, identically with aforementioned substances also can.
There is no particular restriction for the unsaturated single amount body of the repeatability in the above-mentioned general expression (2), can as
4-(meta)Acryloiloxy-2，2，6，6-tetramethylpiperidine，
4-(meta)Acryloilamino-2，2，6，6-tetramethylpiperidine，
4-(meta)Acryloiloxy-1，1，2，2，6，6-pentamethylpiperidine，
4-(meta)Acryloilamino-1，1，2，2，6，6-pentamethylpiperidine，
4-cyano-4-(meta)Acryloilamino-2，2，6，6-tetramethylpiperidine，
4-Clotonoilamino-2，2，6，6-tetramethylpiperidine，
1-(meta)Acryloil-4(meta)Acryloilamino-2，2，6，6-tetramethylpiperidine，
1-(meta)Acryloil-4-cyano-4-(meta)Acryloilamino-2，2，6，6-tetramethylpiperidine，
1-Clotonoil-4-Clotonoiloxy-2,2,6,6-tetramethylpiperidine or the like.
The aforementioned common coincidence ratio that contains the unsaturated single amount body of repeatability (b) of the stable base of light is below above 10.0% quality of 0.1 quality %, especially to be good below the 10.0 quality % more than the 0.2 quality %, with ideal below 10.0 quality more than the 0.5 quality %.When the aforementioned common coincidence ratio that contains the unsaturated list amount body (b) of the stable base of light is lower than aforementioned range, may causes the polyvalent alcohol that is constituted by the common coincidence of the unsaturated single amount body of repeatability to be difficult to form and have filming of high weatherability variability.On the other hand, when the aforementioned common coincidence ratio that contains unsaturated single amount body (b) of the stable base of light exceeds aforementioned range, may cause key propertys such as gloss, solvent resistance to reduce.
Example
Followingly the present invention is described in detail, but the record of present embodiment is not the explanation to limiting property of the present invention according to embodiment.
(embodiment 1)
With the tygon polyvalent alcohol as 100 parts of the adhesive resin additives of substrate polymer (Japan twist flax fibers and weave (strain) " Pairon "); 50 parts of colloidal silicas (" PL-1 " of Japan's chemical industry (strain)) that contain mean particle diameter 20nm; ((the pressure propylene resin particle (ponding changes into " MBX-15 " of product industrial (strain)) that adds mean particle diameter 15 μ m in the polymer composition that " PUVA-1033 " of big tomb chemistry (strain) is 5 parts is made baste for 50 parts to rigidizer, and this baste is smeared 15g/m with the cylinder coating method on the transparent polyethylene system substrate layer of thickness 100 μ m (Japan twist flax fibers and weave (strain) " A-4300 ") surface for 5 parts of " CoronateHX " of Japanese Polyurathan (strain) and light stabilizer
2(conversion solid part) makes its sclerosis form light diffusion layer.In addition, in above-mentioned polymer composition, add the propylene resin particle (ponding changes into " MBX-5 " of product industry (strain)) of mean particle diameter 5 μ m and make baste for 10 parts, this baste is smeared 3g/m with the cylinder coating method
2At the above-mentioned substrate layer back side (conversion solid part), make its sclerosis form to cohere and prevent layer, obtain the optical diffusion film of embodiment 1 according to this.
(embodiment 2)
Do not add above-mentioned light stabilizer, to be used in the adhesive resin additive, all the other are all identical with previous embodiment 1 as substrate polymer for the propylene polyvalent alcohol that contains the stable base of light except that use.This is the optical diffusion film that is obtained by embodiment 2.
(comparative example)
Do not add the aforementioned lights stabilizing agent, except that use do not contain the stable base of light the alkanes resin as substrate polymer to be used in the adhesive resin additive (Geneca (strain) " NeoRezR-960 "), all the other are all identical with previous embodiment 1.This is the optical diffusion film that is obtained by comparative example.
(evaluation of characteristic)
Utilize the optical diffusion film of previous embodiment 1, embodiment 2, comparative example, assess the weatherability and the thermotolerance of each light diffusing sheet.Its result is as shown in table 1 below.
Each optical diffusion film is carried out rayed test in 48 hours with KISENON weather meter, and observation has or not the problem that flavescence takes place at the weatherability variability.
(1) flavescence then draws zero as not influencing use.
(2) flavescence situation is serious, can influence when using then to draw *.
Each light diffusing sheet is combined in 12.3 o'clock the backlight module, insert in the environmental testing device of 60 ℃ of 90%RH, and unlatching fluorescent tube, after 1 hour, 2 hours, 4 hours, 8 hours, 12 hours, 24 hours, from the generation degree of backlight group of brightness irregularities of seeing, judge whether optical diffusion film has the bending of generation and degree of crook thereof.
(1) completely without the brightness irregularities phenomenon, when bending produces ◎
(2) almost do not have the brightness irregularities phenomenon, when only atomic little crooked the generation being arranged zero
(3) some brightness irregularities phenomenons, △ when having slight curves to produce are arranged
(4) have the brightness irregularities phenomenon, when little crooked the generation arranged *
(5) have clear and definite brightness irregularities phenomenon, have in during crooked the generation * *
(6) brightness irregularities very obviously appears, when having macrobending to produce * * *
(table 1)
Weatherability variability and thermotolerance evaluation result
| Embodiment 1 | |
Comparative example | ||
| The weatherability variability | ○ | ○ | × | |
| Thermotolerance | 1 hour | ◎ | ◎ | ◎ |
| 2 hours | ◎ | ◎ | ○ | |
| 4 hours | ◎ | ◎ | △ | |
| 8 hours | ◎ | ◎ | × | |
| 12 hours | ◎ | ◎ | ×× | |
| 24 hours | ○ | ◎ | ××× | |
Shown in above-mentioned table 1, the substrate polymer that constitutes binder adopts tygon polyvalent alcohol or propylene polyvalent alcohol, contain light stabilizer or the stable base of light in the binder of embodiment 1 and the optical diffusion film of embodiment 2, both demonstrations all have higher usability and thermotolerance than the optical diffusion film of comparative example.Especially in the optical diffusion film of embodiment 2, the adhesive substrate polymer adopts the propylene polyvalent alcohol that contains the stable base of light, shows to have obviously outstanding weatherability and thermotolerance.
Claims (12)
1, a kind of optical diffusion film is characterized in that possessing:
Transparent substrate layer has light diffusion layer in the overlapping of substrate layer surface;
And contain light diffusing agent in the adhesive of this light diffusion layer;
And this adhesive is made of the polymer composition that contains polyvalent alcohol and small inorganic filler and light stabilizer;
And the mean particle diameter of this small inorganic filler is below the above 50nm of 5nm.
2, a kind of optical diffusion film is characterized in that possessing:
Transparent substrate layer has light diffusion layer in the overlapping of substrate layer surface;
And contain light diffusing agent in the adhesive of this light diffusion layer,
And this adhesive is made of the polyvalent alcohol that contains the stable base of tool light and the polymer composition of small inorganic filler;
And the mean particle diameter of this small inorganic filler is below the above 50nm of 5nm.
3, optical diffusion film as claimed in claim 1 or 2 is characterized in that: this diffusion barrier has to overlap to have to cohere at the above-mentioned substrate layer back side and prevents layer; And this cohere prevent the layer adhesive in be dispersed with bead; And this adhesive is made of the polymer composition that contains polyvalent alcohol and small inorganic filler and light stabilizer; And the mean particle diameter of this small inorganic filler is below the above 50nm of 5nm.
4, optical diffusion film as claimed in claim 1 or 2 is characterized in that: this diffusion barrier has to overlap to have to cohere at the above-mentioned substrate layer back side and prevents layer; And this cohere prevent the layer adhesive in be dispersed with bead; And this adhesive is made of the polyvalent alcohol that contains the stable base of tool light and the polymer composition of small inorganic filler; And the mean particle diameter of this small inorganic filler is below the above 50nm of 5nm.
5, optical diffusion film as claimed in claim 1 is characterized in that: what above-mentioned light stabilizer adopted is hindered amine light stabilizer.
6, optical diffusion film as claimed in claim 1 or 2 is characterized in that: above-mentioned small inorganic filler is fixed with organic polymer on the surface.
7, optical diffusion film as claimed in claim 6 is characterized in that: said fixing has and is added with the following alkoxy of the above 50mmol/g of 0.01mmol/g in the small inorganic filler of organic polymer.
8, optical diffusion film as claimed in claim 6, it is characterized in that: above-mentioned organic polymer has hydroxyl, and above-mentioned polymer composition comprises selected one or two or more kinds among the following three: multi-functional isocyanates, melamine compound and amino plastics.
9, optical diffusion film as claimed in claim 1 or 2 is characterized in that: contain loop chain alkane hydroxyl in the above-mentioned polyvalent alcohol.
10, optical diffusion film as claimed in claim 1 or 2 is characterized in that: add the rigidizer that contains aliphatic isocyanates in the polymer composition.
11, the backlight module used of a kind of liquid crystal indicator, it possesses optical diffusion film, and can disperse the light from fluorescent tube and it is directed to face side; It is characterized in that:
This optical diffusion film possesses: substrate layer, and it is transparence; And light diffusion layer, face side at this substrate layer is laminated forms for it;
And this light diffusion layer comprises light diffusing agent in binder;
And this adhesive is made of the polymer composition that contains polyvalent alcohol and small inorganic filler and light stabilizer;
And the mean grain size of this small inorganic filler is below the above 50nm of 5m.
12, the backlight module used of a kind of liquid crystal indicator, it possesses optical diffusion film, and can disperse the light from fluorescent tube and it is directed to face side; It is characterized in that:
This optical diffusion film possesses: substrate layer, and it is transparence; And light diffusion layer, face side at this substrate layer is laminated forms for it;
And this light diffusion layer comprises light diffusing agent in binder;
And this adhesive is made of the polyvalent alcohol that contains the stable base of tool light and the polymer composition of small inorganic filler;
And the mean grain size of this small inorganic filler is below the above 50nm of 5nm.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002086456 | 2002-03-26 | ||
| JP200286456 | 2002-03-26 | ||
| JP200364212 | 2003-03-10 | ||
| JP2003064212A JP4351456B2 (en) | 2002-03-26 | 2003-03-10 | Light diffusion sheet and backlight unit using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1447135A CN1447135A (en) | 2003-10-08 |
| CN1249461C true CN1249461C (en) | 2006-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031209785A Expired - Lifetime CN1249461C (en) | 2002-03-26 | 2003-03-26 | Photo diffusion membrane and relative backlight modular |
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| Country | Link |
|---|---|
| JP (1) | JP4351456B2 (en) |
| KR (1) | KR100487936B1 (en) |
| CN (1) | CN1249461C (en) |
| TW (1) | TWI287645B (en) |
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|---|---|---|---|---|
| CN101840103A (en) * | 2010-04-23 | 2010-09-22 | 上海凯鑫森产业投资控股有限公司 | Diffusion sheet for backlight module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100601759B1 (en) * | 2003-11-26 | 2006-07-14 | 주식회사 코오롱 | Light diffusion film for LCD back-light unit |
| KR100525050B1 (en) * | 2004-03-19 | 2005-10-31 | 주식회사 코오롱 | Transparent optical film having surface-deformation-inhibiting layer where particles are placed |
| CN100389346C (en) * | 2004-08-07 | 2008-05-21 | 鸿富锦精密工业（深圳）有限公司 | Light guiding plate and manufacturing method thereof |
| TWI354807B (en) * | 2007-06-12 | 2011-12-21 | Eternal Chemical Co Ltd | Optical film |
| JP2010026222A (en) * | 2008-07-18 | 2010-02-04 | Jiroo Corporate Plan:Kk | Base sheet for optical sheet |
| KR100989076B1 (en) * | 2008-08-01 | 2010-10-20 | 에이비씨나노텍 주식회사 | Cross-linking Agents Incorporating A Light Diffusion Agent of Spherical Silica Bead And Methods For Making Same |
| JP5013619B2 (en) * | 2008-12-03 | 2012-08-29 | 協和化学工業株式会社 | Light diffusion structure |
| WO2012005147A1 (en) * | 2010-07-09 | 2012-01-12 | 株式会社 きもと | Light-blocking member for optical instrument |
| CN102933988B (en) * | 2010-07-09 | 2015-12-16 | 木本股份有限公司 | Light-blocking member for optical instrument |
| CN102681053B (en) * | 2012-04-16 | 2014-04-02 | 浙江元泰特种膜有限公司 | Photoelectric diffusion film and process for manufacturing same |
| TW201416719A (en) * | 2012-10-16 | 2014-05-01 | kai-xiong Cai | Light diffusing member |
| CN105051575B (en) * | 2013-03-28 | 2018-11-13 | 琳得科株式会社 | Optical diffusion film composition and optical diffusion film |
| JP6351532B2 (en) * | 2015-03-26 | 2018-07-04 | 富士フイルム株式会社 | Functional film and method for producing functional film |
| KR101690669B1 (en) | 2016-05-19 | 2016-12-28 | 조욱현 | Coating layer compositions for light diffusing and coating layer member of light diffusing manufactured by using the same |
| KR102385160B1 (en) * | 2017-03-31 | 2022-04-08 | 도레이첨단소재 주식회사 | Reflective polarizing film, light source assembly comprising the same, and display comprising the same |
| CN107490902A (en) * | 2017-10-12 | 2017-12-19 | 京东方科技集团股份有限公司 | A kind of backlight module, display panel, display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2958191B2 (en) * | 1992-08-11 | 1999-10-06 | 株式会社きもと | Light diffusion sheet |
| JPH11237506A (en) * | 1998-02-20 | 1999-08-31 | Nippon Shokubai Co Ltd | Light-selective transmissible film |
| JP3119846B2 (en) * | 1998-09-17 | 2000-12-25 | 恵和株式会社 | Light diffusion sheet and backlight unit using the same |
| JP2001066404A (en) * | 1999-08-30 | 2001-03-16 | Keiwa Inc | Light diffusing sheet and backlight unit using same |
| JP2001131419A (en) * | 1999-11-05 | 2001-05-15 | Nippon Zeon Co Ltd | Light-diffusing composition |
| JP2001172475A (en) * | 1999-12-16 | 2001-06-26 | Jsr Corp | Composition for forming light scattering film and light scattering film |
| JP2001343529A (en) * | 2000-03-30 | 2001-12-14 | Kanegafuchi Chem Ind Co Ltd | Protective film for polarizer and its manufacturing method |
| JP4028155B2 (en) * | 2000-04-11 | 2007-12-26 | 日本カーバイド工業株式会社 | Fluorescent retroreflective sheet |
| JP2001318210A (en) * | 2000-05-11 | 2001-11-16 | Keiwa Inc | Light diffusion sheet and backlight unit using the same |
| JP4225675B2 (en) * | 2000-09-07 | 2009-02-18 | 富士フイルム株式会社 | Antiglare antireflection film and liquid crystal display device |
-
2003
- 2003-03-10 JP JP2003064212A patent/JP4351456B2/en not_active Expired - Lifetime
- 2003-03-20 TW TW092106158A patent/TWI287645B/en not_active IP Right Cessation
- 2003-03-26 CN CNB031209785A patent/CN1249461C/en not_active Expired - Lifetime
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101840103A (en) * | 2010-04-23 | 2010-09-22 | 上海凯鑫森产业投资控股有限公司 | Diffusion sheet for backlight module |
| CN101840103B (en) * | 2010-04-23 | 2011-07-13 | 上海凯鑫森产业投资控股有限公司 | Diffusion sheet for backlight module |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200305034A (en) | 2003-10-16 |
| KR20030077472A (en) | 2003-10-01 |
| JP4351456B2 (en) | 2009-10-28 |
| CN1447135A (en) | 2003-10-08 |
| TWI287645B (en) | 2007-10-01 |
| JP2004004600A (en) | 2004-01-08 |
| KR100487936B1 (en) | 2005-05-04 |
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