CN103665690A - Light diffuser - Google Patents

Light diffuser Download PDF

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Publication number
CN103665690A
CN103665690A CN201310108155.2A CN201310108155A CN103665690A CN 103665690 A CN103665690 A CN 103665690A CN 201310108155 A CN201310108155 A CN 201310108155A CN 103665690 A CN103665690 A CN 103665690A
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China
Prior art keywords
light
light diffusion
diffusion body
resin
resin particle
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Granted
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CN201310108155.2A
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Chinese (zh)
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CN103665690B (en
Inventor
石森史高
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Sekisui Kasei Co Ltd
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Sekisui Plastics Co Ltd
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Priority claimed from JP2013017582A external-priority patent/JP6188337B2/en
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Abstract

The invention provides a light diffuser which can guarantee full light transmission, light diffusion and light resistance and can be thinned. The light diffuser can be manufactured with a light diffusion resin composition dispersed with resin particles and an inorganic compound in base material resin. The resin particles are polymer particles formed by polymer of a monomer mixture containing a (meta)acrylic acid single-function monomer and a multi-function monomer and having the volume average particle size of 2-10 microns and the refractive index of 1.540-1.560. The inorganic compound is barium sulfate with the volume average particle size of 0.4-0.7 microns. 1.5-2.5 weight parts of the resin particles are included with respect to 100 weight parts of the light diffusion resin composition. Besides, the content ratio of the resin particles to the inorganic compound in the light diffusion resin composition, by weight, ranges from 1:0.5-1:1.35.

Description

Light diffusion body
Technical field
The present invention relates to have the light diffusion body of light transmission and light diffusing.
Background technology
In the past, the light diffusion body being formed by the resin combination that comprises the substrate resins such as acrylic resin, polycarbonate resin, styrene resin is in lighting fixtures, for example, as the light diffusion body (illuminating cover, light source being covered) of diffusion occurring and use from the light of light source for making.
In the light source of lighting fixtures, luminescent lamp or incandescent light had obtained being widely used in the past, but in recent years, for the object of seeking long lifetime, used just gradually LED to replace luminescent lamp and incandescent light.Luminescent lamp and incandescent light are to omnibearing luminous, and LED is forwards luminous, compares with incandescent light with luminescent lamp, and its directive property is high.In addition, for example using, in the lighting fixtures of LED as light source,, the mode that is arranged in a plurality of LED chips on substrate to cover is provided as the illuminating cover of light diffusion body, if but the diffusion of light based on this light diffusion body is insufficient, can see LED chip, appearance poor by transmission illumination cover.Therefore, and take the light diffusion body that lighting fixtures that luminescent lamp or incandescent light be light source uses and compare, for take the light diffusion body that lighting fixtures that LED is light source uses, require higher light diffusing.
For example, in patent documentation 1, disclose the LED light source light diffusing sheet that a kind of methacrylic resin composition by comprising polymkeric substance (A), emboliform mineral compound (B) and emboliform cross-linked resin (C) forms, described polymkeric substance (A) is to take the monomer polymerization that methyl methacrylate is main body to form.
In this patent documentation 1 disclosed LED light source with light diffusing sheet owing to thering is higher light transmission and light diffusing, therefore take in the lighting fixtures that LED is light source, can make to spread fully from the light of LED, inhibition can see through light diffusing sheet and see the situation of LED chip, and makes to see through fully from the light of LED.
prior art document
patent documentation
Patent documentation 1: TOHKEMY 2010-77179 communique
Summary of the invention
the problem that invention will solve
Yet, the illuminating cover (light diffusion body) of the lighting fixtures using in house for pendent lamp etc., require slimming and lightweight so that user can easily dismantle.In addition, for the illuminating cover of the lighting fixtures using, require that ultraviolet ray etc. is had to sufficient photostabilization so that can life-time service from outside light in house.
But, although disclosed LED light source is brought into play sufficient light diffusing under the thickness of 3mm in patent documentation 1 with light diffusing sheet, if thinner than 3mm, cannot bring into play sufficient light diffusing.In addition, in patent documentation 1, disclosed LED light source is easily subject to ultraviolet ray with light diffusing sheet and waits the impact of light around and variable color, and photostabilization is poor.
The present invention makes in view of above-mentioned condition, and its object is to provide guarantees sufficient light transmission, light diffusing and photostabilization and light diffusion body that can slimming.
for the scheme of dealing with problems
Light diffusion body of the present invention is characterised in that, it is to be formed by the light-diffusing resin composition that is dispersed with resin particle and mineral compound in substrate resin, the serve as reasons polymer formation of the monomer mixture that comprises (methyl) acrylic acid or the like monofunctional monomer and polyfunctional monomer of aforementioned resin particle, volume average particle size 2～10 μ m, the polymer particle of specific refractory power 1.540～1.560, aforementioned mineral compound is that volume average particle size is the barium sulfate of 0.4～0.7 μ m, aforementioned light-diffusing resin composition is with respect to this light-diffusing resin composition of 100 weight parts, comprise 1.5～2.5 weight part aforementioned resin particles, containing than in weight ratio of aforementioned resin particle in aforementioned light-diffusing resin composition and aforementioned mineral compound, in scope for 1:0.5～1:1.35.Wherein, in this specification sheets, (methyl) acrylic acid or the like refers to methacrylic or acrylic acid or the like.
This light diffusion body of the present invention comprises with the ratio of regulation the barium sulfate that has the specific refractory power of regulation and the resin particle of volume average particle size, has the volume average particle size of regulation, described resin particle is by the polymer formation of the monomer mixture that comprises (methyl) acrylic acid or the like monofunctional monomer and polyfunctional monomer, thus at the thickness than in the past thinner (particularly, the thickness of 2mm) under, also there is excellent light transmission and light diffusing, and the light such as ultraviolet ray are had to excellent photostabilization.
the effect of invention
According to the present invention, can provide and guarantee sufficient light transmission, light diffusing and photostabilization, and light diffusion body that can slimming.
Accompanying drawing explanation
Fig. 1 means the diffusible chart that sees through light in the light diffusion body of embodiments of the invention 1.
Embodiment
light diffusion body of the present invention
Light diffusion body of the present invention is that the light-diffusing resin composition that resin particle and mineral compound is dispersed in form in substrate resin is shaped and is formed.
Aforementioned substrates resin is so long as transparent resin is just not particularly limited, and being preferably with the refringence of aforementioned resin particle is resin, for example acrylic resin of 0.05～0.07 left and right.As the acrylic resin that can use as aforementioned substrates resin, can list and take the resin that methyl methacrylate obtains as principal constituent polymerization.As can with the monomer that can form the methyl methacrylate copolymer of aforementioned acrylic resin, can list methyl acrylate, (methyl) ethyl propenoate, (methyl) butyl acrylate, (methyl) cyclohexyl acrylate, (methyl) ethyl acrylate, (methyl) phenyl acrylate, (methyl) benzyl acrylate, (methyl) 2-Hydroxy ethyl acrylate, (methyl) glycidyl acrylate, (methyl) esters of acrylic acids such as (methyl) vinylformic acid diethylamino ethyl ester, (methyl) acrylic acid or the like, ethylene glycol bisthioglycolate (methyl) acrylate, trimethylolpropane tris (methyl) acrylate, (methyl) allyl acrylate, multifunctional (methyl) esters of acrylic acids such as neopentyl glycol two (methyl) acrylate, vinylbenzene, the aromatic vinyl monomer classes such as alpha-methyl styrene, phenyl maleimide, the maleimides such as N-cyclohexylmaleimide, maleic anhydride etc., but be not limited to these.Wherein, in this specification sheets, (methyl) acrylate refers to methacrylic ester or acrylate.
The serve as reasons polymer particle of polymer formation of the monomer mixture that comprises (methyl) acrylic acid or the like monofunctional monomer and polyfunctional monomer of aforementioned resin particle.
Aforementioned (methyl) acrylic acid or the like monofunctional monomer refers to (methyl) acrylic monomer with 1 ethene unsaturated group.As aforementioned (methyl) acrylic acid or the like monofunctional monomer, for example, can list methyl acrylate, ethyl propenoate, n-butyl acrylate, isobutyl acrylate, propyl acrylate, vinylformic acid n-octyl, dodecylacrylate, ethyl acrylate, stearyl acrylate ester, vinylformic acid-2-chloroethene ester, phenyl acrylate, benzyl acrylate, cyclohexyl acrylate, α-allylmethyl, methyl methacrylate, β-dimethyl-aminoethylmethacrylate, propyl methacrylate, n-BMA, methacrylic acid isobutyl-, n octyl methacrylate, lauryl methacrylate, methacrylic acid-2-ethylhexyl, methacrylic acid stearyl ester, methacrylic acid-2-chloroethene ester, phenyl methacrylate, benzyl methacrylate, cyclohexyl methacrylate, vinylformic acid dimethylamino ethyl ester, dimethylaminoethyl methacrylate, vinylformic acid diethylamino ethyl ester, diethyl aminoethyl methacrylate, 2-Hydroxy ethyl acrylate, 2-hydroxypropyl acrylate, methacrylic acid-2-hydroxy methacrylate, methacrylic acid-2-hydroxy propyl ester, (methyl) esters of acrylic acids such as methacrylic acid-2-hydroxyl butyl ester, vinyl cyanide, methacrylonitrile, acrylamide, Methacrylamide etc. (methyl) acrylic acid derivative, vinylformic acid, methacrylic acid etc.In the present invention, owing to accessing light transmission and the light diffusing of expectation, so methyl methacrylate is preferred.In addition, these (methyl) acrylic acid or the like monofunctional monomers may be used singly or in combination of two or more.
Aforementioned polyfunctional monomer refers to the polyfunctional monomer with 2 above ethene unsaturated groups.As aforementioned polyfunctional monomer, for example, can list ethylene glycol bisthioglycolate (methyl) acrylate, Diethylene Glycol two (methyl) acrylate, triethylene glycol two (methyl) acrylate, TEG two (methyl) acrylate, ethylene glycol bisthioglycolate in the ninth of the ten Heavenly Stems (methyl) acrylate, ten TEG two (methyl) acrylate, ethylene glycol bisthioglycolate in the last of the ten Heavenly stems (methyl) acrylate, ten five ethylene glycol two (methyl) acrylate, propylene glycol two (methyl) acrylate, four propylene glycol two (methyl) acrylate, 1,3 butylene glycol two (methyl) acrylate, neopentyl glycol two (methyl) acrylate, BDO two (methyl) acrylate, 1,6-hexylene glycol two (methyl) acrylate, allyl methacrylate(AMA), glycerine two (methyl) acrylate, trimethylolpropane tris (methyl) acrylate, tetramethylolmethane four (methyl) acrylate, O-phthalic acid diethylene glycol two (methyl) acrylate, caprolactone modification Dipentaerythritol six (methyl) acrylate, caprolactone modification hydroxypivalic acid ester neopentylglycol diacrylate, polyester acrylate, urethane acrylate etc. (methyl) esters of acrylic acid polyfunctional monomer, Vinylstyrene, divinyl naphthalene, Phthalic acid, diallyl ester and their derivative aromatic vinyl base class polyfunctional monomer.Among these polyfunctional monomers, preferably use (methyl) esters of acrylic acid polyfunctional monomer.As polyfunctional monomer, if use (methyl) esters of acrylic acid polyfunctional monomer, in above-mentioned light diffusion body, can seek sunproof raising.In the present invention, these polyfunctional monomers can be used separately, also can combine two or more use.
Content about the aforementioned polyfunctional monomer in aforementioned monomer mixture, so long as can realize the content that the specific refractory power of the resin particle that makes this monomer mixture polymerization and obtain is 1.540～1.560, just there is no particular limitation, with respect to 100 weight part aforementioned monomer mixtures, be preferably 0.5～50 weight part, 3～30 weight parts more preferably.The content of the aforementioned polyfunctional monomer in aforementioned monomer mixture is with respect to 100 weight part aforementioned monomer mixtures during lower than 0.5 weight part, has the resin particle that makes aforementioned monomer polymerization of mixtures and obtain not possess sufficient thermotolerance, aforementioned resin particle the worry of dissolving occurs during melting mixing in substrate resin.On the other hand, when the content of the aforementioned polyfunctional monomer in aforementioned monomer mixture surpasses 50 weight part with respect to 100 weight part aforementioned monomer mixtures, cannot obtain the stable on heating raising effect with the corresponding aforementioned resin particle of content of aforementioned polyfunctional monomer, the worry that therefore has cost to uprise.
Aforementioned monomer mixture is as long as the specific refractory power that can realize by the polymer particle (resin particle) of the polymer formation of this monomer mixture is 1.540～1.560, can only comprise above-mentioned (methyl) acrylic acid or the like monofunctional monomer and polyfunctional monomer as monomer, also can comprise other monomers except above-mentioned (methyl) acrylic acid or the like monofunctional monomer and polyfunctional monomer.For example, in aforementioned monomer mixture, if contain styrenic monofunctional monomer on the basis of (methyl) acrylic acid or the like monofunctional monomer and polyfunctional monomer, can obtain with low cost the polymer particle of specific refractory power 1.540～1.560.
Aforementioned styrenic monofunctional monomer refers to the styrene monomer with 1 ethene unsaturated group.As aforementioned styrenic monofunctional monomer, can use any of vinylbenzene and substituted phenylethylene (substituting group comprises low alkyl group, halogen atom (particularly chlorine atom) etc.).Particularly, operable vinylbenzene, o-methyl styrene, a vinyl toluene, p-methylstyrene, to ethyl styrene, 2,4-dimethyl styrene, align butylstyrene, p-tert-butylstyrene, to positive hexyl phenenyl ethene, to n-octyl vinylbenzene, align nonyl benzene ethene, align decyl vinylbenzene, align dodecyl vinylbenzene, to methoxy styrene, to styryl phenyl, to chloro-styrene, 3,4-dichlorostyrene, alpha-methyl styrene etc.In the present invention owing to accessing light transmission and the light diffusing of expectation, so optimization styrene.In addition, these styrenic monofunctional monomers can be used separately, also can combine two or more use.
It should be noted that, proportional about containing of the aforementioned styrenic monofunctional monomer in aforementioned monomer mixture and aforementioned (methyl) acrylic acid or the like monofunctional monomer, so long as can realize the ratio that the specific refractory power by the polymer particle (resin particle) of the polymer formation of this monomer mixture is 1.540～1.560, be just not particularly limited.
The aforementioned resin particle using in the present invention can be by utilizing known polymerization process that aforementioned monomer polymerization of mixtures is manufactured.As concrete polymerization process, can list solution polymerization, suspension polymerization, seeding polymerization etc.While manufacturing aforementioned resin particle utilizing seeding polymerization to carry out the polymerization of above-mentioned monomer mixture, only otherwise the physical property of expectation is impacted, in this resin particle, can comprise any composition that derives from seed herein.It should be noted that, by using these manufacture method, the ratio of the various monomer components in resin particle can reach the ratio (the compounding ratio of monomer component) of expectation.
The volume average particle size of the aforementioned resin particle using in the present invention is in the scope of 2～10 μ m, is preferably in the scope of 2～8 μ m.During the volume average particle size less than 2 μ m of aforementioned resin particle, there is the worry that cannot obtain sufficient light transmission in light diffusion body, while surpassing 10 μ m, have the worry that cannot obtain sufficient light diffusing in light diffusion body.
In addition, the variation coefficient of the particle diameter of the aforementioned resin particle using in the present invention (CV value) is not particularly limited, and is preferably 20～50%, more preferably 25～40%.If the CV value 25～40% of aforementioned resin particle is proportional suitably to containing of the large particle of particle diameter from the little particle of particle diameter, for light diffusion body, can guarantees sufficient total light transmittance, and more improve light diffusing.
In scope that the specific refractory power of the aforementioned resin particle using in the present invention in addition, is 1.540～1.560, more preferably in 1.545～1.555 scope.The specific refractory power of aforementioned resin particle was lower than 1.540 o'clock, there is the worry that cannot obtain sufficient light diffusing in light diffusion body, surpass at 1.560 o'clock, while having light diffusion body slimming, (while particularly, making the thickness of 2mm) cannot obtain sufficient light transmission and sunproof worry.
In addition, in the present invention, about aforementioned resin particle in aforementioned light-diffusing resin composition, with respect to the content of aforementioned substrates resin, with respect to 100 weight part aforementioned substrates resins, be 1.5～2.5 weight parts, 1.5～2.0 weight parts more preferably.The content of aforementioned resin particle during lower than 1.5 weight part, has the worry that cannot obtain sufficient light transmission and light diffusing in light diffusion body with respect to 100 weight part aforementioned substrates resins.In addition, when the content of aforementioned resin particle surpasses 2.5 weight part with respect to 100 weight part aforementioned substrates resins, there is the worry of the photostabilization variation of the light diffusion body being formed by light-diffusing resin composition.
In addition, in the present invention, as aforementioned mineral compound, to use volume average particle size be 0.4～0.7 μ m, be preferably the barium sulfate of 0.5～0.62 μ m.The particle diameter of the barium sulfate using as aforementioned mineral compound is during lower than 0.4 μ m, when by light diffusion body slimming (particularly, while making the thickness of 2mm), there is the worry that cannot obtain sufficient light transmission, while surpassing 0.7 μ m, when by light diffusion body slimming (particularly, while making the thickness of 2mm), have cannot obtain sufficient light diffusing worry, have the worry of the balance variation of light diffusing and light transmission in light diffusion body.
In the present invention, the CV value of the barium sulfate using as aforementioned mineral compound is not particularly limited, and is preferably 50～70%, more preferably 55～70%.If the CV value 50～70% of aforementioned barium sulfate is proportional suitably to containing of the large particle of particle diameter from the little particle of particle diameter, for light diffusion body of the present invention, can guarantees sufficient total light transmittance, and more improve light diffusing.
In the present invention, the specific surface area of the barium sulfate using as aforementioned mineral compound is preferably in 3～5m 2in the scope of/g, more preferably in 3～4m 2in the scope of/g.If the specific surface area of barium sulfate is in 3～5m 2in the scope of/g, for light diffusion body of the present invention, can guarantee sufficient total light transmittance, and more improve light diffusing.
In addition, in the present invention, about barium sulfate in aforementioned light-diffusing resin composition, with respect to the content of aforementioned resin particle, with respect to 1 weight part aforementioned resin particle, be 0.5～1.35 weight part, be preferably 0.6～1.33 weight part.That is,, in the present invention, in aforementioned light-diffusing resin composition, aforementioned resin particle and barium sulfate (mineral compound) contains than in weight ratio, in the scope for 1:0.5～1:1.35.When the content of barium sulfate is less than 0.5 weight part with respect to 1 weight part aforementioned resin particle in aforementioned light-diffusing resin composition, there is the worry that cannot obtain sufficient light diffusing in light diffusion body.In addition, in aforementioned light-diffusing resin composition, the content of barium sulfate during more than 1.35 weight part, has the worry that cannot guarantee sufficient total light transmittance in light diffusion body with respect to 1 weight part aforementioned resin particle.
In addition, in aforementioned light-diffusing resin composition, barium sulfate is not particularly limited with respect to the content of aforementioned substrates resin, with respect to 100 weight part aforementioned substrates resins, is preferably 1.0～2.5 weight parts, 1.5～2.5 weight parts more preferably.In aforementioned light-diffusing resin composition, the content of barium sulfate is in the scope of 1.0～2.5 weight parts time with respect to 100 weight part aforementioned substrates resins, can guarantee sufficient light transmission and the photostabilization of light diffusion body, and more improve light diffusing.
In addition, in light diffusion body of the present invention, aforementioned light-diffusing resin composition preferably comprises rubber constituent.By making to contain rubber constituent in aforementioned light-diffusing resin composition, can improve the intensity of light diffusion body.As the rubber constituent that can use in the present invention, can list nucleocapsid type rubber particle, crosslink propylene nitrile divinyl rubber particle, cross-linked styrene divinyl rubber particle, acrylic rubber particle etc.Nucleocapsid type rubber particle is the rubber particles with sandwich layer and shell, for example, outer field shell is by the double-deck particle that glassy polymers forms, the sandwich layer of internal layer consists of rubbery polymer, or outer field shell by glassy polymers form, middle layer is by particle of the 3-tier architecture that rubbery polymer forms, sandwich layer consists of glassy polymers etc.Glass coating such as the polymkeric substance by methyl methacrylate etc. forms, and rubbery polymer layer is such as by formations such as butyl acrylate things (isoprene-isobutylene rubber).These rubber constituents (rubber particles) can be used separately, also can combine two or more use.As the concrete example of aforementioned nucleocapsid type rubber particle, can list Ganz Chemical Industry Co., Ltd. manufacture " STAFILOID(registered trademark) AC3832 ", " STAFILOID(registered trademark) AC3816N " etc.As the concrete example of aforementioned crosslink propylene nitrile divinyl rubber (NBR) particle, can list " XER-91 " (median size 0.5 μ m) of JSR Corp.'s manufacture etc.As the concrete example of aforementioned cross-linked styrene divinyl rubber (SBR) particle, can list " XSK-500 " (median size 0.5 μ m) of JSR Corp.'s manufacture etc.As the concrete example of aforementioned acrylic rubber particle, can list that Mitsubishi Rayon Co., Ltd manufactures " METABLEN(registered trademark) W-300A " (median size 0.1 μ m), " METABLEN(registered trademark) W450A " (median size 0.2 μ m) etc.Among above-mentioned rubber constituent, for example, from mixing transparent viewpoint in substrate resin (, acrylic resin), be preferably aforementioned acrylic rubber particle.For example, from mixing transparent viewpoint in substrate resin (, acrylic resin), the median size of rubber constituent is preferably the scope of 0.005～0.3 μ m, the scope of 0.05～0.3 μ m more preferably.
In addition, about the content of rubber constituent in aforementioned light-diffusing resin composition, with respect to 100 weight part aforementioned substrates resins, be preferably 1～10 weight part, 2～5 weight parts more preferably.When the content of rubber constituent is less than 1 weight part with respect to 100 weight part aforementioned substrates resins, the worry that has the intensity of light diffusion body fully to improve, in addition, and during more than 10 weight part, the worry that has the light transmission of light diffusion body to reduce.
In addition, in light diffusion body of the present invention, aforementioned light-diffusing resin composition only otherwise the physical property of the expectations such as light transmission, light diffusing and photostabilization is impacted, also can comprise other resinous principle on a small quantity.For example, in aforementioned light-diffusing resin composition, also can comprise the various compositions such as white dyes, thermo-stabilizer, UV light absorber, static inhibitor.In the present invention, these various compositions can be given the physical property such as fluorescent brightening, thermostability, ultraviolet-absorbing of light-diffusing resin composition expectation.
In the present invention, as white dyes, be not particularly limited, for example can for example, to use oxazole fluorescent bleaches (" Kayalight(registered trademark) OS " that, Nippon Kayaku K. K manufactures), imidazoles white dyes, rhodamine (rhodamine) fluorescent bleaches.In light-diffusing resin composition, with respect to 100 weight part aforementioned substrates resins, with be preferably 0.0005～0.1 weight part, more preferably 0.001～0.1 weight part, when more preferably the ratio of 0.001～0.05 weight part comprises this white dyes, can give fluorescent brightening to light-diffusing resin composition.
In the present invention, as thermo-stabilizer, be not particularly limited, such as using the organic phosphates thermo-stabilizers such as phosphoric acid ester, phosphorous acid ester, phosphonic acid ester; Hinered phenols thermo-stabilizer; Lactone thermo-stabilizer; There is the phosphorous acid salt antioxidant (" ADEKASTAB(registered trademark) PEP-36 " that for example, Asahi Denka Co., Ltd. manufactures) of the function that suppresses thermooxidizing etc.In light-diffusing resin composition, with respect to 100 weight part aforementioned substrates resins, with be preferably 0.005～0.5 weight part, more preferably 0.01～0.5 weight part, when more preferably the ratio of 0.001～0.3 weight part comprises this thermo-stabilizer, can give thermostability to light-diffusing resin composition.
In the present invention, UV light absorber is not particularly limited, for example can use benzophenone UV light absorber, Benzotriazole Ultraviolet Stabilizer (" ADEKASTAB(registered trademark) LA-31 " that for example, Asahi Denka Co., Ltd. manufactures), hydroxyphenyltriazinuv class UV light absorber etc.In light-diffusing resin composition, with respect to 100 weight part aforementioned substrates resins, with be preferably 0.01～2.0 weight part, more preferably 0.03～2.0 weight part, when more preferably the ratio of 0.05～1.0 weight part comprises this UV light absorber, can give ultraviolet-absorbing to light-diffusing resin composition.
In the present invention, as static inhibitor, be not particularly limited, can use and ooze out and bring into play the exudative type static inhibitor of antistatic property and forever bring into play antistatic property and any of the permanent anti-static agent of not oozing out.
As above-mentioned exudative type static inhibitor, be not particularly limited, for example can list the tensio-active agent of cationic, anionic species, betaines (zwitterionic classes) and nonionic class.In these tensio-active agents, preferred alkyl benzene sulfonate, alkylsulfonate, glycerol fatty acid ester.As alkylsulfonate, for example can list that Kao Corp manufactures " Electrostripper(registered trademark) PC ", as glycerol fatty acid ester, for example, can list Miyoshi Yushi Co., " the DASPER K200 " that Ltd. manufactures.This tensio-active agent (exudative type static inhibitor) can be used separately, also can combine two or more use.With respect to 100 weight part aforementioned substrates resins, with 0.1～3 weight part, when more preferably the ratio of 0.5～1.5 weight part comprises this tensio-active agent (exudative type static inhibitor), can give the sufficient antistatic property of light-diffusing resin composition and not make light-diffusing resin composition variable color.
In addition, as above-mentioned permanent anti-static agent, be not particularly limited, from a small amount of interpolation, obtain the viewpoint of permanent antistatic performance, the segmented copolymer preferably being formed by wetting ability block and hydrophobicity block.
The segmented copolymer being formed by wetting ability block and hydrophobicity block refers to, the multipolymer that wetting ability block and hydrophobicity block repeat to be alternately combined into by keys such as ester bond, imide bond, amido linkage, ehter bond, amino-formate bonds, as hydrophobicity block, can list polyolefine etc., as wetting ability block, can list polyethers, contain polyethers hydrophilic polymer, cation property copolymer and anionic property polymkeric substance etc.
For the polyethers as hydrophobicity block, can use polyether glycol, polyether diamine and their modifier.For as hydrophobicity block containing polyethers hydrophilic polymer, as polyether segment forming component, can use and there is the polyether ester amides of polyether glycol segment, there is equally the polyetheramides imide of polyether glycol segment, there is equally the polyether ester of polyether glycol segment, there is the polyetheramides of polyether diamine segment equally, there is equally the polyethers carbamate of polyether glycol or polyether diamine segment.Cation property copolymer as hydrophobicity block can be used the cation property copolymer in molecule with cationic group.As aforementioned male ionic group, can list and there is quaternary ammonium salt with the group of phosphonium salt.For the anionic property polymkeric substance as hydrophobicity block, can use to have sulfonic dicarboxylic acid and glycol or polyethers as must Component units and molecule in have 2～80 sulfonic anionic property polymkeric substance etc.
As the concrete example of the segmented copolymer being formed by wetting ability block and hydrophobicity block as above, can list " PELESTAT(registered trademark) 230 " (specific refractory power 1.50) of manufacturing as the Sanyo Chemical Industries, Ltd. in molecule with the segmented copolymer of polyether block and polyolefin block.
In light-diffusing resin composition, with respect to 100 weight part aforementioned substrates resins, being preferably 2～20 weight parts, when more preferably the ratio of 5～15 weight parts comprises permanent anti-static agent as above, can forever give light-diffusing resin composition sufficient antistatic property.
Light diffusion body of the present invention is not subject to the restriction of its manufacture method, preferably, aforementioned substrates resin, aforementioned resin particle, aforementioned mineral compound and other additives as required (for example, white dyes, thermo-stabilizer, UV light absorber or static inhibitor etc.) are shaped and are manufactured by extrusion molding method with specified amount mixing, light-diffusing resin composition mixing and that obtain.Aforementioned mixing and mixing such as utilizing ribbon mixer, Henschel mixer, Banbury mixer, drum tumbler (drum tumbler), single screw extrusion machine, twin screw extruder, multiple screw extruder etc. to carry out.It is suitable that aforementioned mixing temperature condition is generally 240～300 ℃.Then, utilize extrusion molding method that aforementioned mixing and mixture mixing and that obtain are configured as to particulate state, obtaining granular light-diffusing resin composition, is tabular by this granular light-diffusing resin composition extrusion molding, can obtain thus tabular light diffusion body (light diffusing sheet).Or can be tabular by utilizing extrusion molding method to be configured as the light-diffusing resin composition of aforementioned mixing and mixing gained, thereby can obtain tabular light diffusion body (light diffusing sheet).And then, by above-mentioned tabular light diffusion body (light diffusing sheet) being carried out to vacuum forming or pressing empty shaping etc., thereby can obtain the light diffusion body of different shape.
Light diffusion body of the present invention when thickness is 2mm, demonstrate preferably more than 55%, 55～65% total light transmittance more preferably, demonstrate preferably 55 ° of above, dispersity of 55～60 ° more preferably.In addition, light diffusion body of the present invention is when thickness is 2mm, and the measuring method of the aberration after exposing to the open air with promotion described later is obtained exposes aberration (Hunter value Δ E) after 200 hours to the open air and be preferably lower than 3, more preferably lower than 1.
This light diffusion body thin thickness of the present invention (particularly, during thickness 2mm) and demonstrate higher total light transmittance and dispersity, for example, at the lighting fixtures as thering is LED light source (for example, general illumination device, illuminated displays and lighting billboard etc.) light diffusion body and while using, can make to spread fully from the light of LED light source.And then, there is excellent photostabilization, as the light diffusion body that the lighting fixtures of use is used at least within doors, there is higher weather resistance.In addition, for the above-mentioned light diffusion body that aberration (Hunter value Δ E) after 200 hours is little, for example aberration (Hunter value Δ E) of exposing to the open air lower than for 1 light diffusion body, not only can be used as use within doors, and the light diffusion body of using as the lighting fixtures of room external application also has higher weather resistance.
The thickness of light diffusion body of the present invention is not particularly limited, and by being set as 1.0～3.0mm, 1.4～2.0mm more preferably, thereby can bring into play excellent light diffusing, light transmission and photostabilization.
Light diffusion body of the present invention can used as covering the illuminating cover of light source such as in using the lighting fixtures of the various light sources such as luminescent lamp, photodiode (LED).The shape of light diffusion body of the present invention is not particularly limited, and can make different shape according to its purposes.For example, when light diffusion body of the present invention is used as illuminating cover, the shape of this light diffusion body can be semicircular cylinder shape, tabular, dome-shaped.
embodiment
Below the physical property of the light diffusion body of embodiments of the invention is elaborated.
First, to the measuring method of specific surface area of the calculation method of the variation coefficient of the particle diameter of the measuring method of the volume average particle size of the resin particle of the light diffusion body for the manufacture of embodiments of the invention and barium sulfate, aforementioned resin particle and barium sulfate (CV value), barium sulfate, the measuring method of the measuring method of the specific refractory power of resin particle and the promote aberration after exposing to the open air describe.
the measuring method of the volume average particle size of resin particle
The volume average particle size of polymer particle is calculated by following method: the pore of aperture 20～400 μ m is full of to electrolyte solution, the electric conductivity of the electrolyte solution by particle during by this electrolyte solution changes obtains volume, calculates thus volume average particle size.Particularly, the volume average particle size of resin particle is the volume average particle size (average diameter of the size-grade distribution of volume reference) of using the accurate particle size distribution device " Multisizer III " of Ku Er special formula formula (Beckman Coulter, Inc. manufactures) to measure.Wherein, " Reference MANUAL FOR THE COULTER MULTISIZER " (1987) of issuing according to Coulter Electronics Limited during mensuration, use is suitable for the hole (aperture) of the particle diameter of the particle measured, carry out Multisizer III calibration, measure.
Particularly, by contact mixing tank and ultrasonic wave, 0.1g resin particle is dispersed in 10ml0.1 % by weight nonionic class surfactant soln and makes dispersion liquid.Be arranged at " Multisizer III " main body, be full of and measure with electrolytic solution " ISOTON(registered trademark) II " (Beckman Coulter, Inc. in beaker manufacture), limit is slowly stirred limit and is dripped aforementioned dispersion liquid with dropper, and the reading of the densitometer of " Multisizer III " main body picture is in 10% left and right.Then, according to the REFERENCE MANUAL FOR THE COULTER MULTISIZER(1987 of Coulter Electronics Limited distribution) to " Multisizer III " main body input aperture (diameter, aperture size), Current(hole electric current, aperture electric current), Gain(gain), the polarity of Polarity(medial electrode), with manual(manual mode) measure the size-grade distribution of volume reference.In mensuration, with the degree that can not make to sneak into bubble in beaker, slowly stir, to measured 100,000 particles size-grade distribution time finish to measure.The volume average particle size of resin particle is the mean value of the particle diameter of 100,000 particles of mensuration, refers to the average diameter of the size-grade distribution of volume reference.
the measuring method of the volume average particle size of barium sulfate
Laser diffraction and scattering particle size distribution device for the volume average particle size of barium sulfate (average diameter of the size-grade distribution of volume reference) (Beckman Coulter, Inc. manufacture, " LS13320 type ") is measured.Particularly, 0.1g barium sulfate, the 10ml1 % by weight trisodium phosphate aqueous solution are dropped into developmental tube, with contact mixing tank (Yamato Scientific Co., Ltd. manufacture, " TOUCHMIXER MT-31 "), mixed for 2 seconds.Then, with commercially available ultrasonic washer (manufacture of VELVO-CLEAR company, " ULTRASONIC CLEANER VS-150 "), make the barium sulfate in developmental tube carry out disperseing for 10 minutes, obtain dispersion liquid.Ultrasonic wave is irradiated to dispersion liquid in limit, and the volume average particle size (average diameter of the size-grade distribution of volume reference) of the barium sulfate in dispersion liquid is measured on limit with above-mentioned laser diffraction and scattering particle size distribution device.Optical model during this mensuration conforms to the specific refractory power (1.64) of the barium sulfate of mensuration.
the method of calculation of the CV value of resin particle and barium sulfate
Resin particle and barium sulfate CV value separately by carry out aforementioned volume reference the mensuration of size-grade distribution time standard deviation (σ) and volume average particle size (x), according to following mathematical expression, calculate.
CV value (%)=(σ/x) * 100
the measuring method of the specific surface area of barium sulfate
The BET method (nitrogen adsorption method) that the specific surface area of barium sulfate is recorded by JIS R1626 is measured.For the barium sulfate as determination object, use automatic specific surface area/pore measure of spread device Tristar3000 that Shimadzu Scisakusho Ltd manufactures to measure BET nitrogen adsorption isothermal line, utilize BET multipoint method to calculate specific surface area by nitrogen adsorptive capacity.Wherein, the mensuration of nitrogen adsorption isothermal line is used nitrogen as adsorbate, at adsorbate sectional area 0.162nm 2condition under with constant volume method, carry out.
the measuring method of the specific refractory power of resin particle
The detecting refractive index of resin particle is undertaken by Baker process.Should be by the detecting refractive index of Baker process, on slide glass, place resin particle and drip REFRACTIVE LIQUID (CARGILLE company manufactures: CARGILLE standard refraction liquid, take 0.002 specific refractory power interval and prepare respectively the REFRACTIVE LIQUID that many parts of specific refractory poweres are 1.538～1.562).Then, after resin particle is mixed well with REFRACTIVE LIQUID, the light of the high-pressure mercury lamp (model " NX35 ", centre wavelength 589nm) of Iwasaki Electric Co., Ltd.'s manufacture is irradiated on limit from below, and the profile of observation by light microscope particle is passed through on limit from top.Then, while can't see profile, judgement REFRACTIVE LIQUID equates with the specific refractory power of resin particle.
Wherein, utilize the observation of opticmicroscope so long as can confirm that the multiplying power of the profile of resin particle observes, just no problem, if but the particle of particle diameter 5 μ m, it is suitable with the multiplying power of 500 times of left and right, observing.According to aforesaid operations, the more approaching profile that is more difficult to observe resin particle of the specific refractory power of resin particle and REFRACTIVE LIQUID, therefore, the specific refractory power of the REFRACTIVE LIQUID during by the almost illegible of profile of resin particle is judged as with the specific refractory power of this resin particle and equates.
In addition, when between 2 kinds of REFRACTIVE LIQUIDs that refringence is 0.002, the visible situation of resin particle does not have difference, the specific refractory power using the intermediate value of the specific refractory power of these 2 kinds of REFRACTIVE LIQUIDs as this resin particle.For example, while testing with the REFRACTIVE LIQUID of specific refractory power 1.554 and 1.556 respectively, when the visible situation of resin particle does not have difference in two REFRACTIVE LIQUIDs, the intermediate value of the specific refractory power of these REFRACTIVE LIQUIDs 1.555 is judged to be to the specific refractory power of resin particle.
Then, the measuring method of the total light transmittance of the light diffusion body of embodiments of the invention and dispersity is described.Wherein, in the mensuration of total light transmittance and dispersity, using the tabular light diffusion body (light diffusing sheet) of thickness 2mm, the 50mm * 100mm of embodiment described later and comparative example gained as determination object.
the measuring method of the total light transmittance of light diffusion body
The total light transmittance of light diffusion body is measured according to JIS K7361.Particularly, total light transmittance is used Japanese electricity Se Industrial Co., Ltd to manufacture " NDH-4000 " measures.Make working sample count n=10, calculate the mean value of the total light transmittance (%) of these 10 working samples, the total light transmittance using this mean value as light diffusion body (%).
the measuring method of the dispersity of light diffusion body
The dispersity of light diffusion body (D50) is used automatic angle photometer (the Goniophotometer GP-200 that in village, color technical institute manufactures), according to following step, obtains.
From the direct projection light of the photometric light source of automatic angle, from being arranged at from the normal direction of the light diffusion body of the distance of light source 75cm, irradiate.With movable light-receiving device, measure the light intensity that sees through light diffusion body.By this intensity conversion, be transmitance, corresponding to the angle of off-normal direction, on figure, describe transmitance.The angle when transmitance (directing light transmitance) of obtaining the light of normal direction by this figure reaches 50% transmitance.This angle is called to dispersity (D50).The unit of this dispersity (D50) is " ° (degree) ".In addition, (D50) is larger for dispersity, means that diffustivity is more excellent.
Then, the measuring method of the aberration after the promotion of the light diffusion body of embodiments of the invention is exposed to the open air describes.Wherein, promote in the mensuration of the aberration after exposing, using the tabular light diffusion body (light diffusing sheet) of thickness 2mm, the 50mm * 100mm of embodiment described later and comparative example gained as test film.
promote the measuring method of the aberration after exposing to the open air
First, with the Hunter value (E of the measuring method determination test sheet of the color shown in following 0).Then carry out promotion exposure test shown below, by the measuring method of the color shown in following, measure the Hunter value (E that promotes the test film after exposure test 1).Then, the Hunter value (E of the test film before exposure test will be promoted 0) be worth (E with promoting the Hunter of the test film after exposure test 1) poor (E 1-E 0) as the aberration (Hunter Δ E value) after promoting to expose to the open air.
promote exposure test
The promotion exposure test of light diffusion body is according to 2 of the exposure test method-of JIS K7350-2(plastics-based on laboratory light source: xenon arc lamp) carry out.Particularly, under following test conditions, test film is exposed to the open air 200 hours under xenon arc lamp.
test conditions
Irradiating unit: Super Xenon Weather Meter-SX75 type (Suga Test Instruments Co., Ltd. manufactures)
Illuminate condition: blackboard temperature (63 ℃), without the conversion of dark period, without spray(spraying), Outer Filter#275
Wavelength region: 300～400nm
Radiation illumination: 180W/m 2
Test film: thickness 2mm, 50mm * 100mm
Thoughs: temperature (28～32 ℃), humidity (45～55%)
the measuring method of color
The mensuration of color is according to the measuring method-reflection of JIS Z8722(color and see through object color) carry out.Particularly, under following condition determination, be placed on the color that benchmark is pressed determination test sheet on special-purpose blank, obtain Hunter value.
condition determination
Determinator: beam splitting type color meter SE-2000(Japan electricity Se Industrial Co., Ltd manufactures)
Color management software: ColorMate5(Japan electricity Se Industrial Co., Ltd manufactures)
The tristimulus values of on-gauge plate (C/2): Y=96.09, X=94.13, Z=113.36
Benchmark is pressed special-purpose blank: Y=76.5, X=75.4, Z=84.6
Measuring method: reflection method
Light source: C/2 ° of visual field condition measured
Then, the manufacture method of the resin particle of the light diffusion body for the manufacture of embodiments of the invention 1～6 (A) and resin particle (B) is described.
the manufacture method of resin particle (A)
In the stainless steel beaker of volume 5L, drop into 3000g pure water, 1.5g Sodium Lauryl Sulphate BP/USP (500ppm), 90g magnesium pyrophosphate, prepare water.
In the different stainless steel beaker of the stainless steel beaker that uses in the preparation from water, drop into 400g as the methyl methacrylate of (methyl) acrylic acid or the like monofunctional monomer, 500g as the vinylbenzene of styrenic monofunctional monomer, 100g as the Vinylstyrene (DVB) of polyfunctional monomer, 3g as the n-dodecyl mercaptan of chain-transfer agent, 7g as 2 of polymerization starter, 2-azo two-(2,4-methyl pentane nitrile), 4g tert-butyl hydroperoxide-2-ethylhexyl, fully stir and prepare oil phase.
The water of preparation before the oil phase of preparation is added, the TK mixer for well-distribution (homomixer) that uses PRIMIX Corporation to manufacture stirs 15 minutes under 8000rpm, obtains suspension liquid.Then, the suspension liquid of gained is transferred in the reactor of the capacity 5L that possesses stirrer and thermometer, then make monomer (monomer) polymerization 5 hours at 60 ℃ after, at 110 ℃, heats 2 hours, be then cooled to 30 ℃, obtain resin particle slurry.Then in resin particle slurry, add hydrochloric acid, until the pH of slurry is below 2.Then use centrifuge washing to add the resin particle slurry of persalt, until the pH of washing water is 6～7, dewater thereafter.Use Vacuumdrier, at 60 ℃ of jacket temperatures, the dewatered cake of gained is thus carried out to the vacuum-drying of 20 hours.Then make it pass through 400 objects and sieve, obtain resin particle (A).
By said determination method, measuring the volume average particle size of this resin particle (A), is 5.4 μ m.In addition, calculating the CV value of resin particle (A) by above-mentioned calculation method, is 37.9%.In addition, measuring the specific refractory power of this resin particle (A) by said determination method, is 1.555.
the manufacture method of resin particle (B)
Making the usage quantity of methyl methacrylate be 550g, making cinnamic usage quantity is 350g, similarly operates in addition with the manufacture method of above-mentioned resin particle (A), obtains resin particle (B).By said determination method, measuring the volume average particle size of this resin particle (B), is 5.8 μ m.In addition, calculating the CV value of resin particle (B) by above-mentioned calculation method, is 33.9%.In addition, measuring the specific refractory power of this resin particle (B) by said determination method, is 1.540.
Then, to the resin particle of the light diffusion body for the manufacture of aftermentioned comparative example 1 (C) and for the manufacture of the manufacture method of the resin particle (D) of the light diffusion body of comparative example 10, describe.
the manufacture method of resin particle (C)
Do not use methyl methacrylate, make cinnamic usage quantity for 900g, similarly operate with the manufacture method of above-mentioned resin particle (A) in addition, obtain resin particle (C).By said determination method, measuring the volume average particle size of this resin particle (C), is 5.6 μ m.In addition, calculating the CV value of resin particle (C) by above-mentioned calculation method, is 38.2%.In addition, measuring the specific refractory power of this resin particle (C) by said determination method, is 1.592.
the manufacture method of resin particle (D)
In the stainless steel beaker of volume 5L, drop into 3000g pure water, 1.5g Sodium Lauryl Sulphate BP/USP (500ppm), 90g magnesium pyrophosphate, prepare water.
In the different stainless steel beaker of the stainless steel beaker that uses in the preparation from water, drop into 950g as the methyl methacrylate of (methyl) acrylic acid or the like monofunctional monomer, 50g as the ethylene glycol dimethacrylate (EGDMA) of polyfunctional monomer, 3g as the n-dodecyl mercaptan of chain-transfer agent, 7g as 2 of polymerization starter, 2-azo two-(2,4-methyl pentane nitrile), 4g tert-butyl hydroperoxide-2-ethylhexyl, fully stir and prepare oil phase.
The water of preparation before the oil phase of preparation is added, the TK mixer for well-distribution (homomixer) that uses PRIMIX Corporation to manufacture stirs 15 minutes under 8000rpm, obtains suspension liquid.Then, the suspension liquid of gained is transferred in the reactor of the capacity 5L that possesses stirrer and thermometer, then make monomer (monomer) polymerization 5 hours at 50 ℃ after, at 105 ℃, heats 2 hours, be then cooled to 30 ℃, obtain resin particle slurry.Then in resin particle slurry, add hydrochloric acid, until the pH of slurry is below 2.Then use centrifuge washing to add the resin particle slurry of persalt, until the pH of washing water is 6～7, dewater thereafter.Use Vacuumdrier, at 60 ℃ of jacket temperatures, the dewatered cake of gained is thus carried out to the vacuum-drying of 20 hours.Then make it pass through 400 objects and sieve, obtain resin particle (D).By said determination method, measuring the volume average particle size of this resin particle (D), is 5.2 μ m.In addition, calculating the CV value of resin particle (D) by above-mentioned calculation method, is 34.2%.In addition, measuring the specific refractory power of this resin particle (D) by said determination method, is 1.496.
Then, the manufacture method of the resin particle of the light diffusion body for the manufacture of embodiments of the invention 7～10 (E)～(H) is described.
the manufacture method of resin particle (E)
Make the usage quantity of the methyl methacrylate of conduct (methyl) acrylic acid or the like monofunctional monomer be 350g, make to be 600g and then to use 50g ethylene glycol dimethacrylate (EGDMA) to replace 100g Vinylstyrene (DVB) as polyfunctional monomer as the cinnamic usage quantity of styrenic monofunctional monomer, similarly operate with the manufacture method of above-mentioned resin particle (A) in addition, obtain resin particle (E).
By said determination method, measuring the volume average particle size of this resin particle (E), is 5.5 μ m.In addition, calculating the CV value of resin particle (E) by above-mentioned calculation method, is 37.0%.In addition, measuring the specific refractory power of this resin particle (E) by said determination method, is 1.554.
the manufacture method of resin particle (F)
Make the usage quantity of the methyl methacrylate of conduct (methyl) acrylic acid or the like monofunctional monomer be 350g, make to be 600g and then to use 50g trimethylolpropane trimethacrylate (TMP) to replace 100g Vinylstyrene (DVB) as polyfunctional monomer as the cinnamic usage quantity of styrenic monofunctional monomer, similarly operate with the manufacture method of above-mentioned resin particle (A) in addition, obtain resin particle (F).
By said determination method, measuring the volume average particle size of this resin particle (F), is 5.4 μ m.In addition, calculating the CV value of resin particle (F) by above-mentioned calculation method, is 36.5%.In addition, measuring the specific refractory power of this resin particle (F) by said determination method, is 1.553.
the manufacture method of resin particle (G)
Make the usage quantity of the methyl methacrylate of conduct (methyl) acrylic acid or the like monofunctional monomer be 350g, make to be 600g and then to use 50g1 as the cinnamic usage quantity of styrenic monofunctional monomer, 6-hexanediol dimethacrylate (1,6HX) replace 100g Vinylstyrene (DVB) as polyfunctional monomer, similarly operate with the manufacture method of above-mentioned resin particle (A) in addition, obtain resin particle (G).
By said determination method, measuring the volume average particle size of this resin particle (G), is 5.3 μ m.In addition, calculating the CV value of resin particle (G) by above-mentioned calculation method, is 38.9%.In addition, measuring the specific refractory power of this resin particle (G) by said determination method, is 1.553.
the manufacture method of resin particle (H)
Make the usage quantity of the methyl methacrylate of conduct (methyl) acrylic acid or the like monofunctional monomer be 350g, make to be 600g and then to use 50g allyl methacrylate(AMA) (AMA) to replace 100g Vinylstyrene (DVB) as polyfunctional monomer as the cinnamic usage quantity of styrenic monofunctional monomer, similarly operate with the manufacture method of above-mentioned resin particle (A) in addition, obtain resin particle (H).
By said determination method, measuring the volume average particle size of this resin particle (H), is 5.8 μ m.In addition, calculating the CV value of resin particle (H) by above-mentioned calculation method, is 39.4%.In addition, measuring the specific refractory power of this resin particle (H) by said determination method, is 1.554.
The light diffusion body of embodiments of the invention 1～10 and comparative example 1～10 is below shown.
embodiment 1
(Sumitomo Chemical Co manufactures acrylic resin using 100 weight parts as substrate resin, trade(brand)name " SUMIPEX(registered trademark) EX "), 2.5 weight parts are as acrylic rubber particle (Mitsubishi Rayon Co., Ltd's manufacture of rubber constituent, trade(brand)name " METABLEN(registered trademark) W-300A "), 2.0 weight parts are by the resin particle (A) of the specific refractory power 1.555 of above-mentioned manufacture method gained, the volume average particle size that 2.0 weight parts (being 1 weight part with respect to 1 parts by weight resin particle) are measured by said determination method is barium sulfate (the settleability barium sulfate " B55 " that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m, CV value 65.9%, specific surface area 4.13g/m 2) with Henschel mixer, mix 15 minutes, obtain mixture.Single-bolt type forcing machine for this mixture (Hoshi Plastic K.K. manufacture " R50 ") is extruded with the condition of 210～260 ℃ of temperature, output 10～25kg/h and water-cooled after; with tablets press cutting, obtain granular light-diffusing resin composition.Then by the granular light-diffusing resin composition of gained at 105 ℃ predrying 5 hours, fully remove after moisture, with T-shaped mould extrusion shaper (Kabushiki Kaisha Soken manufactures, bore 30mm, L/D=38, T shape Mould Breadth 250mm, die lip 2mm) extrusion moulding at 220～260 ℃ of temperature, be tabular, obtain the light diffusing sheet (light diffusion body) of thickness 2mm.The light diffusing sheet that operation obtains is like this cut into wide 50mm, long 100mm, carries out evaluation (mensuration of total light transmittance and dispersity) and the sunproof evaluation (promoting the mensuration of the aberration after exposure test) of optical characteristics.
Fig. 1 is the result that sees through light intensity with the light diffusing sheet (light diffusion body) of automatic angle photometric determination embodiment 1 gained.The longitudinal axis is the relative value that sees through light intensity, and the point the chart when this value is 50% draws vertical line, obtains the intersection point with transverse axis.The value of this transverse axis be angle (°), be called dispersity (D50).In measurement result shown in this Fig. 1, dispersity (D50) is 57.3 °.In addition, dispersity (D50) is made as the arithmetical av of absolute value of 2 of the left and right value (value of the angle when seeing through light intensity and being 50%) of 0 ° of the initial point of transverse axis.
embodiment 2
With respect to 100 weight part substrate resins, compounding 2.0 weight parts (being 1 weight part with respect to 1 parts by weight resin particle) volume average particle size is barium sulfate (settleability barium sulfate " B300 ", CV value 59.9%, the specific surface area 3.4g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.62 μ m 2) to replace 2.0 weight part volume average particle size be barium sulfate (settleability barium sulfate " B55 ", CV value 65.9%, the specific surface area 4.13g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m 2), use in addition the method identical with embodiment 1 to obtain light diffusing sheet (light diffusion body).
embodiment 3
With respect to 100 weight part substrate resins, compounding 1.5 parts by weight resin particles (A), and then compounding 2.0 weight parts (being 1.33 weight parts with respect to 1 parts by weight resin particle) volume average particle size is barium sulfate (settleability barium sulfate " B300 ", CV value 59.9%, the specific surface area 3.4g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.62 μ m 2) to replace 2.0 weight part volume average particle size be barium sulfate (settleability barium sulfate " B55 ", CV value 65.9%, the specific surface area 4.13g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m 2), use in addition the method identical with embodiment 1 to obtain light diffusing sheet (light diffusion body).
embodiment 4
With respect to 100 weight part substrate resins, compounding 2.5 parts by weight resin particles (A), and then compounding 1.5 weight parts (being 0.6 weight part with respect to 1 parts by weight resin particle) volume average particle size is barium sulfate (settleability barium sulfate " B300 ", CV value 59.9%, the specific surface area 3.4g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.62 μ m 2) to replace 2.0 weight part volume average particle size be barium sulfate (settleability barium sulfate " B55 ", CV value 65.9%, the specific surface area 4.13g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m 2), use in addition the method identical with embodiment 1 to obtain light diffusing sheet (light diffusion body).
embodiment 5
With respect to 100 weight part substrate resins, compounding 2.0 weight parts (being 1 weight part with respect to 1 parts by weight resin particle) volume average particle size is barium sulfate (settleability barium sulfate " B300 ", CV value 59.9%, the specific surface area 3.4g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.62 μ m 2) to replace 2.0 weight part volume average particle size be barium sulfate (settleability barium sulfate " B55 ", CV value 65.9%, the specific surface area 4.13g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m 2), be unworthy of mixing up acrylic rubber particle for rubber constituent (Mitsubishi Rayon Co., Ltd manufactures, trade(brand)name " METABLEN(registered trademark) W-300A "), use in addition the method identical with embodiment 1 to obtain light diffusing sheet (light diffusion body).
embodiment 6
With respect to 100 weight part substrate resins, compounding 2.5 weight parts replace 2.0 parts by weight resin particles (A) by the resin particle (B) of the specific refractory power 1.540 of above-mentioned manufacture method gained, use in addition the method identical with embodiment 1 to obtain light diffusing sheet (light diffusion body).
embodiment 7
With respect to 100 weight part substrate resins, compounding 2.0 weight parts replace 2.0 parts by weight resin particles (A) by the resin particle (E) of the specific refractory power 1.554 of above-mentioned manufacture method gained, use in addition the method identical with embodiment 5 to obtain light diffusing sheet (light diffusion body).
embodiment 8
With respect to 100 weight part substrate resins, compounding 2.0 weight parts replace 2.0 parts by weight resin particles (A) by the resin particle (F) of the specific refractory power 1.553 of above-mentioned manufacture method gained, use in addition the method identical with embodiment 5 to obtain light diffusing sheet (light diffusion body).
embodiment 9
With respect to 100 weight part substrate resins, compounding 2.0 weight parts replace 2.0 parts by weight resin particles (A) by the resin particle (G) of the specific refractory power 1.553 of above-mentioned manufacture method gained, use in addition the method identical with embodiment 5 to obtain light diffusing sheet (light diffusion body).
embodiment 10
With respect to 100 weight part substrate resins, compounding 2.0 weight parts replace 2.0 parts by weight resin particles (A) by the resin particle (H) of the specific refractory power 1.554 of above-mentioned manufacture method gained, use in addition the method identical with embodiment 5 to obtain light diffusing sheet (light diffusion body).
comparative example 1
With respect to 100 weight part substrate resins, compounding 2.0 weight parts replace 2.0 parts by weight resin particles (A) by the resin particle (C) of the specific refractory power 1.592 of above-mentioned manufacture method gained, and then compounding 2.0 weight parts (being 1 weight part with respect to 1 parts by weight resin particle) volume average particle size is barium sulfate (settleability barium sulfate " B300 ", CV value 59.9%, the specific surface area 3.4g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.62 μ m 2) to replace 2.0 weight part volume average particle size be barium sulfate (settleability barium sulfate " B55 ", CV value 65.9%, the specific surface area 4.13g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m 2), by the method identical with embodiment 1, obtain light diffusing sheet (light diffusion body) in addition.
comparative example 2
With respect to 100 weight part substrate resins, compounding 0.7 parts by weight resin particle (A), and then compounding 2.2 weight parts (being 3.14 weight parts with respect to 1 parts by weight resin particle) volume average particle size is barium sulfate (settleability barium sulfate " B300 ", CV value 59.9%, the specific surface area 3.4g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.62 μ m 2) to replace 2.0 weight part volume average particle size be barium sulfate (settleability barium sulfate " B55 ", CV value 65.9%, the specific surface area 4.13g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m 2), by the method identical with embodiment 1, obtain light diffusing sheet (light diffusion body) in addition.
comparative example 3
With respect to 100 weight part substrate resins, compounding 2.0 weight parts (being 1 weight part with respect to 1 parts by weight resin particle) volume average particle size is barium sulfate (settleability barium sulfate " B30 ", CV value 89.4%, the specific surface area 13.84g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.34 μ m 2) to replace 2.0 weight part volume average particle size be barium sulfate (settleability barium sulfate " B55 ", CV value 65.9%, the specific surface area 4.13g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m 2), by the method identical with embodiment 1, obtain light diffusing sheet (light diffusion body) in addition.
comparative example 4
With respect to 100 weight part substrate resins, compounding 0.5 weight part (being 0.25 weight part with respect to 1 parts by weight resin particle) volume average particle size is barium sulfate (settleability barium sulfate " B300 ", CV value 59.9%, the specific surface area 3.4g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.62 μ m 2) to replace 2.0 weight part volume average particle size be barium sulfate (settleability barium sulfate " B55 ", CV value 65.9%, the specific surface area 4.13g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m 2), by the method identical with embodiment 1, obtain light diffusing sheet (light diffusion body) in addition.
comparative example 5
With respect to 100 weight part substrate resins, compounding 1 parts by weight resin particle (A), and then compounding 4 weight parts (being 4 weight parts with respect to 1 parts by weight resin particle) volume average particle size is barium sulfate (settleability barium sulfate " B300 ", CV value 59.9%, the specific surface area 3.4g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.62 μ m 2) to replace 2.0 weight part volume average particle size be barium sulfate (settleability barium sulfate " B55 ", CV value 65.9%, the specific surface area 4.13g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m 2), by the method identical with embodiment 1, obtain light diffusing sheet (light diffusion body) in addition.
comparative example 6
With respect to 100 weight part substrate resins, not compounding volume average particle size is barium sulfate (settleability barium sulfate " B55 ", CV value 65.9%, the specific surface area 4.13g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m 2), by the method identical with embodiment 1, obtain light diffusing sheet (light diffusion body) in addition.
comparative example 7
With respect to 100 weight part substrate resins, compounding 3 parts by weight resin particles (A) and then not compounding volume average particle size are barium sulfate (settleability barium sulfate " B55 ", CV value 65.9%, the specific surface area 4.13g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m 2), by the method identical with embodiment 1, obtain light diffusing sheet (light diffusion body) in addition.
comparative example 8
With respect to 100 weight part substrate resins, compounding 5 parts by weight resin particles (A), and then not compounding volume average particle size is barium sulfate (settleability barium sulfate " B55 ", CV value 65.9%, the specific surface area 4.13g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m 2), by the method identical with embodiment 1, obtain light diffusing sheet (light diffusion body) in addition.
Comparative example 9
With respect to 100 weight part substrate resins, compounding 2.0 weight part volume average particle size are barium sulfate (settleability barium sulfate " B-1 ", CV value 49.4%, the specific surface area 2.2g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.75 μ m 2) to replace 2.0 weight part volume average particle size be barium sulfate (settleability barium sulfate " B55 ", CV value 65.9%, the specific surface area 4.13g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m 2), by the method identical with embodiment 1, obtain light diffusing sheet (light diffusion body) in addition.
comparative example 10
With respect to 100 weight part substrate resins, compounding 2.0 weight parts replace 2.0 parts by weight resin particles (A) by the resin particle (D) of the specific refractory power 1.496 of above-mentioned manufacture method gained, and then compounding 2.0 weight parts (being 1 weight part with respect to 1 parts by weight resin particle) volume average particle size is barium sulfate (settleability barium sulfate " B300 ", CV value 59.9%, the specific surface area 3.4g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.62 μ m 2) to replace 2.0 weight part volume average particle size be barium sulfate (settleability barium sulfate " B55 ", CV value 65.9%, the specific surface area 4.13g/m that Sakai Chemical Industry Co., Ltd. manufactures of 0.50 μ m 2), by the method identical with embodiment 1, obtain light diffusing sheet (light diffusion body) in addition.
Table 1 illustrates for the manufacture of the total light transmittance of the light diffusion body of the compounding amount of the various raw materials of the light-diffusing resin composition of the light diffusion body of embodiment 1～10 and comparative example 1～10 (with respect to the weight part of 100 weight part substrate resins), these embodiment 1～6 and comparative example 1～10, dispersity (D50) and promotes the aberration (Hunter Δ E value) after exposure test.
table 1
Figure BDA00002989478000301
As shown in table 1, when the light diffusion body of embodiments of the invention 1～10 is made the thickness of 2mm, shown more than 55% (particularly, 55.44～58.30%) total light transmittance and 55 ° are above (particularly, 55.00～57.95 °) dispersity, can think and show excellent light transmission and light diffusing.In addition, the promotion of the light diffusion body of embodiments of the invention 1～6 exposes aberration (Hunter Δ E value) after 200 hours to the open air lower than 3(particularly, below 2.5), can think that the light diffusion body of embodiment 1～10 has at least as sufficient photostabilization in illuminating practicality within doors.
In addition, about comprising any the light diffusion body of embodiment 7～10 in the resin particle (E) that use (methyl) esters of acrylic acid polyfunctional monomer manufactures as polyfunctional monomer～(H), use resin particle (A) that Vinylstyrene (DVB) manufactures as polyfunctional monomer or the light diffusion body of embodiment (B) 1～6 to compare with comprising, the aberration (Hunter Δ E value) that its promotion exposed to the open air after 200 hours is little, can think that photostabilization is more excellent.Particularly, the promotion of the light diffusion body of embodiment 7～10 exposes aberration (Hunter Δ E value) after 200 hours to the open air lower than 1(particularly, below 0.6), not only have for throwing light on within doors but also having as illuminating photostabilization that can be practical outside room.
On the other hand, the light diffusion body that uses the comparative example 1 that the resin particle (C) of specific refractory power 1.592 manufactures is compared with having used the light diffusion body of embodiment 1～10 of any manufacture of the resin particle (A), (B) of specific refractory power 1.540～1.560 and (E)～(H), and its total light transmittance is low, light transmission is poor.In addition, the aberration after the promotion of the light diffusion body of comparative example 1 exposes to the open air surpasses 3, and photostabilization is poor.
In addition, about the content by resin particle, be to be 0.7 weight part with respect to 100 weight part substrate resins, the light diffusion body of the comparative example 2 that the light-diffusing resin composition that the content of barium sulfate is is 3.1 weight parts with respect to 1 parts by weight resin particle forms, with content by resin particle for being 1.5～2.5 weight parts with respect to 100 weight part substrate resins, the content of barium sulfate for respect to 1 parts by weight resin particle be 0.5～1.35 weight part (more specifically, 0.6～1.33 weight part) light diffusion body of the embodiment 1～10 that light-diffusing resin composition forms is compared, its total light transmittance and dispersity are low, optical characteristics.
In addition, use volume average particle size be 0.34 μ m barium sulfate manufacture comparative example 3 light diffusion body with use volume average particle size be 0.4～0.7 μ m(more specifically, the light diffusion body of the embodiment 1～10 of barium sulfate manufacture 0.50～0.62 μ m) is compared, and its total light transmittance is low, light transmission is poor.
In addition, the light diffusion body of the comparative example 4 forming for the light-diffusing resin composition that is 0.25 weight part with respect to 1 parts by weight resin particle about the content by barium sulfate, with content by barium sulfate for respect to 1 parts by weight resin particle, be 0.5～1.35 weight part (more specifically, 0.6～1.33 weight part) light diffusion body of the embodiment 1～10 that light-diffusing resin composition forms is compared, and its dispersity is low, light diffusing is poor.
In addition, about the content by resin particle, be to be 1 weight part with respect to 100 weight part substrate resins, the light diffusion body of the comparative example 5 that the light-diffusing resin composition that the content of barium sulfate is is 4 weight parts with respect to 1 parts by weight resin particle forms, with the content of resin particle with respect to 100 weight part substrate resins, be 1.5～2.5 weight parts, the content of barium sulfate with respect to 1 parts by weight resin particle be 0.5～1.35 weight part (more specifically, 0.6～1.33 weight part) light diffusion body of the embodiment 1～10 that light-diffusing resin composition forms is compared, its total light transmittance is low, light transmission is poor.
In addition, the light diffusion body of the embodiment 1～10 being formed with light-diffusing resin composition by containing barium sulfate by the light diffusion body of the comparative example 6～8 that light-diffusing resin composition of barium sulfate-containing does not form is compared, and its dispersity is low, light diffusing is poor.In addition, the aberration after the promotion of comparative example 7 and 8 light diffusion body exposes to the open air surpasses 3, and photostabilization is poor.
In addition, use volume average particle size be 0.75 μ m barium sulfate manufacture comparative example 9 light diffusion body with use volume average particle size be 0.4～0.7 μ m(more specifically, the light diffusion body of the embodiment 1～10 of barium sulfate manufacture 0.50～0.62 μ m) is compared, and its dispersity is low, light diffusing is poor.
Use the light diffusion body of embodiment 1～10 of any manufacture of the light diffusion body of comparative example 10 that the resin particle (D) of specific refractory power 1.496 manufactures and the resin particle (A) of use specific refractory power 1.540～1.560, (B) and (E)～(H) to compare, its dispersity is low, light diffusing is poor.

Claims (8)

1. a light diffusion body, is characterized in that, it is to be formed by the light-diffusing resin composition that is dispersed with resin particle and mineral compound in substrate resin,
Serve as reasons polymer particle polymer formation, volume average particle size 2～10 μ m, specific refractory power 1.540～1.560 of the monomer mixture that comprises (methyl) acrylic acid or the like monofunctional monomer and polyfunctional monomer of described resin particle,
Described mineral compound is that volume average particle size is the barium sulfate of 0.4～0.7 μ m,
Described light-diffusing resin composition is with respect to this light-diffusing resin composition of 100 weight parts, comprises resin particle described in 1.5～2.5 weight parts,
Described resin particle in described light-diffusing resin composition contains than counting in the scope of 1:0.5～1:1.35 with weight ratio with described mineral compound.
2. light diffusion body according to claim 1, is characterized in that, described polyfunctional monomer is (methyl) esters of acrylic acid polyfunctional monomer.
3. light diffusion body according to claim 1, is characterized in that, described monomer mixture comprises styrenic monofunctional monomer.
4. light diffusion body according to claim 2, is characterized in that, described monomer mixture comprises styrenic monofunctional monomer.
5. according to the light diffusion body described in any one in claim 1～4, it is characterized in that, described substrate resin is acrylic resin.
6. according to the light diffusion body described in any one in claim 1～4, it is characterized in that, described light-diffusing resin composition comprises rubber constituent.
7. according to the light diffusion body described in any one in claim 1～4, it is characterized in that, the thickness of this light diffusion body is 1.0～3.0mm.
8. according to the light diffusion body described in any one in claim 1～4, it is characterized in that, it is shaped described light-diffusing resin composition to form by extrusion molding method, and described light-diffusing resin composition is obtained by mixing described resin particle, described mineral compound and described substrate resin.
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