TW201030027A - Molded object for optical use, and lightguide plate and light diffuser both comprising same - Google Patents

Abstract

A molded object for optical use which has low hygroscopicity, is reduced in warpage and dimensional change, has a low loss of light transmittance in a long optical path, and has satisfactory light resistance; and a lightguide plate and a light diffuser both comprising the molded object for optical use. The molded object for optical use is obtained by molding a styrene resin obtained by polymerizing a styrene monomer having a polymerization inhibitor content lower than 10 ppm and a phenylacetylene compound content of 50 ppm or lower.

Description

[Technical Field] The present invention relates to a molded article for optics, a light guide plate using the same, and a light diffuser. [Prior Art] Acrylic resin is widely used as an optical molded article such as a light guide plate, a diffusion plate, or a lens because it is excellent in transparency. Further, recently, in place of the acrylic resin, various styrene resins have been proposed and used as the molded article for optics. For example, Patent Document 1 proposes to contain methyl methacrylate and a styrene monomer as main components. In the resin molded article of the copolymer of the component, Patent Document 2 proposes a light guide plate containing a styrene-(meth)acrylate-based copolymer resin. Further, Patent Document 3 and Patent Document 4 propose a resin composition comprising a copolymer comprising an aromatic vinyl monomer and a methyl acetonate monomer. Further, Patent Document 5 proposes a multilayer diffusing plate having a styrene polymer or a styrene monomer-methacrylic acid methacrylate copolymer. [Patent Document 1] Japanese Laid-Open Patent Publication No. 2001-342263 [Patent Document 2] Japanese Patent Laid-Open Publication No. Hei No. Hei. No. Hei. No. Hei. No. 2006-052349. Patent Document 4: JP-A-2006-052350 (Patent Document 5) JP-A-2007-264598 SUMMARY OF THE INVENTION Acrylic resin is widely used as an optical molded body, but it is excellent in moisture absorption 145347.doc 201030027 It is more common, so there is a problem that it is easy to produce a slight curvature or a dimensional change. Further, since the acrylic acid-based resin has high thermal decomposition property at the time of molding, it is difficult to cause an appearance defect in the molded article when it is molded at a high temperature. In view of these problems, various styrene resins have been proposed and used as described above. However, the styrene resin is inferior in transparency or light resistance to the acrylic resin, and its use is limited. In particular, in the molded article for optics, it is not possible to use a molded article in a use in which the light transmission distance is long (hereinafter referred to as "long path length"), for example, a light guide plate of 20 inches or more to a large display. A stupid ethylene resin having a low light transmittance is used. Also, as a display light source, a fluorescent tube (Fluorescent Lamp) and an external electrode tube (EEFl tube (External) are generally used.

Electrode Fluorescent Lamp)), cold cathode tube (CCFl tube (Cold)

Cathode Fluorescent Lamp)), but recently with LED (Light Emiuing

In the technical innovation of Diode's light-emitting diode, a new optical molded body suitable for LED light is desired. SUMMARY OF THE INVENTION An object of the present invention is to provide an optical molded article which has less hygroscopicity than a long light path and which has less loss of light transmittance and is excellent in light resistance. Further, an object of the present invention is to provide a light-emitting plate for a liquid crystal display, or a light-conducting material for use in a t-light, or a light-emitting body which is useful as a light diffusing body, in particular, as an LED as a light source. A light guide plate that is useful as a light guide plate for a display or a light diffuser that is useful for applications such as illumination. The present inventors conducted intensive research on the above-mentioned subjects, and found that styrene obtained by polymerizing styrene monomer having less polymerization inhibitor and less phenylacetylene compound content will be borrowed by 145347.doc 201030027. The optical molded article obtained by molding a resin has low hygroscopicity, low loss of light transmittance in a long optical path, and excellent light resistance, and the optical molded body is in a light guide plate or a light diffuser. It is useful to complete the present invention. The optical molding system of the present invention is obtained by molding a styrene-based resin obtained by polymerizing a styrene monomer having a polymerization inhibitor of less than 1 〇 ppm and a acetylene-based compound of ppm or less. The optical molded article of the present invention, in particular, the light guide plate and the light diffuser have low hygroscopicity, are less warped or have small dimensional changes, have less loss of light transmittance in a long optical path, and have good light resistance. Further, the light diffusing body has a good total light transmittance or diffusivity. [Embodiment] <Description of Terms> In the specification of the present application, the symbols "~" refer to "above" and "below". For example, the description of "A to B" means A or more and B or less. In the present specification, the term "molded article for optics" is used for, for example, optical applications such as a light guide plate, a diffusion plate, and a lens. Further, in the present specification, the term "(meth)acrylate monomer" is a generic term for acrylate monomers and mercaptoacrylate monomers. In the present specification, the term "light diffuser" means a person who diffuses light as represented by a diffusion plate or a diffusion cover and emits light on a plane or a curved surface. Hereinafter, embodiments of the optical molded article of the present invention, in particular, a light guide plate 145347.doc 201030027 and a light diffuser will be described in detail. The optical molding system of the present embodiment is formed by molding a styrene resin obtained by polymerizing a styrene-based green body having a polymerization inhibitor of less than 10 ppm and a phenylacetylene compound of 5 〇 ppm or less. By. The optical molded article having the above configuration has less hygroscopicity, less distortion or dimensional change, less loss of light transmittance in a long optical path, and good light resistance. Moreover, the total light transmittance or diffusivity of the light diffuser is also good. [Styrene resin] A stupid vinyl resin is a polymer obtained by polymerizing a styrene monomer. Examples of the styrene-based monomer include styrene, α-methyl styrene, p-methyl styrene, o-methyl styrene, m-methyl styrene, ethyl styrene, p-tert-butyl phenyl b. Rare, preferably styrene. These styrene monomers may be used singly or in combination of two or more. The styrene resin may be a copolymer of a styrene monomer and a monomer copolymerizable with the styrene monomer, and it is preferred to carry out the styrene monomer and the (meth) acrylate monomer. A styrene-(mercapto) acrylate copolymer copolymerized. The styrene-based resin is a styrene-based (meth)acrylic acid vinegar-based copolymer, whereby an effect of good light resistance can be obtained. Examples of the (meth)acrylic acid vinegar-based monomer include (meth)acrylic acid methyl vinegar, (methyl) acrylic acid vinegar, (meth) acrylic acid butyl vinegar, and (methyl) Acrylic acid 2-ethylhexyl vinegar methacrylate vinegar 'acrylic acid methyl vinegar, acrylic vinegar, 145347.doc 201030027 n-butyl propionate, 2-methylhexyl acrylate, π ping acid 2-ethylhexyl Acrylates such as esters and decyl acrylates, and particularly preferred are decyl acrylates. These (meth) acrylate type monomers may be used alone or in combination of two or more. ', may be a styrene-based monomer in the two styrene-based resins, & two J 霄% or more, preferably 疋 6% by mass to 90% by mass, into a double pair of 疋1 0~60皙Jin%. The ratio of the styrene monomer unit is 3 mass.

When the content of the fiber is more than or equal to the above, the moisture absorption of the molded article for optics is lowered, and the thermal stability is improved. The ratio of the right vinyl monomer unit is from 6% by mass to 90% by mass, which is not only the shape of the molded body. The hygroscopicity is lowered, the thermal stability is improved, and the light transmission of the long path length is obtained: the effect of the loss is small. The amount % of the monomer unit is further preferably, and the (meth) acrylate in the styrene resin is 97% by mass or less, preferably 丨〇% by mass to 94% by mass of 40% by mass to 90%. quality%. When the ratio of the (meth)acrylic acid-based monomer unit is 97% by mass or less, the optical molded article has low hygroscopicity and excellent thermal stability. If the ratio of the (mercapto) acrylic acid vine monomer unit is from 1% by mass to 94% by mass, not only the absorption of the shaped body is lowered, the thermal stability is improved, and the light transmission of the long path is obtained. The effect of less loss of rate. The styrene-based resin may be a copolymer of a styrene-based monomer and an ethylenically unsaturated monomer copolymerizable with a styrene-based monomer, as the above-mentioned ethylenically unsaturated monomer, and examples thereof include acrylonitrile. (Meth)acrylic acid, (meth)acrylic acid salt, cis-succinic acid anhydride, and the like. In the case where the heat of the guide is raised to 145347.doc 201030027, it is preferable that mercaptoacrylic acid or maleic anhydride is used. The ethylenically unsaturated monomer may be a mixture of two or more kinds. Here, the ratio of the ethylenically unsaturated monomer unit in the styrene resin is 35 mass% or less, preferably 25% by mass or less, and more preferably 2% by mass or less. If the ratio of ethylenically unsaturated monomer units is 35 mass. In the case of the following, it is possible to improve the heat resistance and the like without losing the low moisture absorption property or the moldability as a characteristic of the styrene resin. (Molecular weight of the ethylenic resin) The molecular weight of the styrene resin is preferably a polystyrene-equivalent weight average molecular weight measured by Gpc (Gei Penneation Chromatography). The molecular weight distribution of ~45 million (weight average molecular number average molecular weight _) is preferably 丨7~2 3 . When Mw is 70,000 or more, a relatively strong molded body can be obtained, and if _ is 450,000 or less, the workability at the time of injection molding becomes good. In addition, when the green color is 1.7 or more, the workability at the time of extrusion molding is improved, and when Mw/M is 2.3 or less, a relatively strong molded body can be obtained. Further, I is caused by temperature or polymerization at the time of polymerization. The initial dose is adjusted. (The photoelastic coefficient of the styrene resin) The A coefficient of elasticity of the styrene tree is preferably _6xi〇.12~6xi〇-12/pa. Further preferably -4xl〇-12 ～Yuguang 5?· When the coefficient of elasticity is -6xl〇-12 ～6χιγρ12/τ» ι± 6χ10 2/Pa, it is better to reduce the unevenness of brightness when making the light guide plate. Quanye. In addition, the photoelastic coefficient can be adjusted by the ratio of the monomer which can be ugly combined with the styrene monomer during polymerization. 145347.doc 201030027. (Melting mass flow rate of styrene resin) The melt mass flow rate (MFR, Melt mass-flow rate ' of the styrene resin is preferably 0.5 to 30 g/ measured according to jis K7210 at a temperature of 200 ° C and a load of 49 N). 1 minute, and further preferably 3 to 20 g/min.

When the MFR is 0.5 g/Ι 〇 or more, the injection moldability is good, and when the MFR is 30 g/l 〇 or less, the extrusion moldability is good, which is preferable. The MFR can be adjusted by the molecular weight, the type of the monomer copolymerizable with the styrene monomer, or the ratio of the I when it is combined. D (The shape of the styrene resin) The shape of the styrene resin is preferably Particle shape. The method of granulating can be carried out by a known method, and is not particularly limited, and is obtained, for example, by melt-extrusion from a nozzle, a straight grip of 2 to 5, followed by a strand, and then a strand cooled by a cooling water tank. Wire cuts are brewed for lengths of 2 to 4. Here, the fine powder contained in the granules is preferably less than 300 ppm, and more preferably 1 〜. If the powder is less than 3 inches, the transmittance will increase first in the long path. Further, in terms of the manufacturing process, t, in many cases, the powder in the granules contains lppnm. Furthermore, the 'powder powder can be sieved by a metal mesh such as (Tyler) 20 mesh.') The styrene resin 100 g is sieved for 5 minutes using a metal mesh of Tyler. The amount of broken powder of the side metal mesh is measured. The amount of broken powder is adjusted by the cutting condition or classification of the strands. The total amount of the early body and the ridge agent remaining in the styrene resin is preferably 145347.doc 201030027 up to 1000 ppm, and more preferably 1 G to ppm. Further, in the case of the production process, the content of the monomer and the solvent remaining in the styrene resin is often 1 〇 ppm or more. When the total amount of the monomer and the solvent remaining in the styrene resin is less than 1 〇〇〇 ppm, the odor at the time of molding or the color change under long-term use can be reduced. The remaining monomer or residual solvent can be adjusted by temperature or pressure during devolatilization. The amount of the oligomer in the styrene-based resin is not particularly limited. However, if a large amount of a polymerization initiator is added to reduce the amount of the oligomer, the light transmittance of the long path is lowered, which is not preferable. In the styrene-based resin, less than (K 5 parts by mass of a known antioxidant light stabilizer, a lubricant, a plasticizer, and an antistatic agent may be added to 100 parts by mass of the styrene resin, but especially In the case of the light plate, it is preferable that it is not added. If the additive is less than 5 parts by mass, the light transmittance of the long path is less decreased. [Polymerization inhibitor] The optical molded body of the present embodiment is characterized by The content of the polymerization inhibitor in the styrene monomer is less than 10 ppm. By making the polymerization inhibitor less than 10 ppm', the light transmittance in the long light path becomes high, and the light resistance becomes good. The content is preferably less than 5 ppm, and more preferably less than 1 ppm. By making the polymerization inhibitor content less than 5 ppm, the light transmittance in the long optical path is further improved, and the light resistance is improved. 145347.doc •10- 201030027 As a polymerization inhibitor, p-benzoic acid or o-phenylene ruthenium or the like can be cited. Usually, styrene monomer which is commercially available from the market contains ι〇~ a polymerization inhibitor of about 3 〇 ppm, so It is necessary to remove or reduce it. The method of removing or subtracting v is not particularly limited, and a method such as distillation or adsorption may be employed. As the method, distillation under reduced pressure is preferred. In the case where the monomer in which the styrene monomer is copolymerized is copolymerized, it is preferred that the polymerization inhibitor in the monomer copolymerizable with the styrene monomer is also set to less than 10 ppm, respectively. Phenylacetylene-based compound The optical molded article of the present invention is characterized in that the content of the phenylacetylene compound in the styrene monomer is 50 ppm or less. Below 50 ppm, the light transmittance in the long pathlength becomes high and the light resistance becomes good. The content of the phenylacetylene compound is preferably less than 40 Ppm, and more preferably less than 20 ppm. The content of the acetylene-based compound is less than 40 ppm, and the light transmittance in the long optical path is further increased, and the light resistance is improved. Generally, it is difficult to separate the phenylacetylene in styrene because the boiling points thereof are similar. 'It can be purchased from the market The styrene is required to contain or reduce the phenylacetylene of about 15 〇ρρηι. The method of removing or reducing is not particularly limited, and a known method such as hydrogenation treatment or adsorption may be employed. The method is preferably a hydrogenation treatment in the presence of a hydrogenation catalyst. [Polymerization reaction] 145347.doc -11 - 201030027 The styrene resin used in the optical molded article of the present embodiment is also particularly preferable in the polymerization reaction. It is preferably obtained by solution polymerization. As the solvent for solution polymerization, a known solvent such as toluene, xylene, ethylbenzene, hexane, cyclohexane, acetone, methyl ethyl ketone or methyl isophthalate can be used. Butyl ketone and the like. The solvent is preferably used in an amount of from 1 to 70 parts by mass, more preferably from 2 to 3 parts by mass, per 100 parts by mass of the total of the monomers to be used. When the solvent is used in an amount of from 1 to 70 parts by mass based on 100 parts by mass of the total of the monomers to be used, it is not only easy to control the viscosity of the ruthenium during polymerization by solution polymerization, but also in the case of copolymerization. The distribution of the polymerization composition is narrowed, and the loss of the light transmittance of the long path is reduced. Further, as the polymerization reaction, particularly preferred is a radical solution polymerization. The free radical solution polymerization has less influence on the residual initiator or auxiliary agent remaining in the styrene resin than the anionic polymerization or cationic polymerization or coordination polymerization, and the light transmittance or light resistance of the long optical path is high. (Polymerization Initiator) In the case of radical polymerization, a known polymerization initiator such as an organic peroxyhalide compound or an azo compound may be added as a source of radical generation. As the polymerization initiator, it is preferred that the one-hour half-life temperature is 95 140 C, the hydrogen abstraction ability is low, and the benzene ring is not contained. Those with lower hydrogen scavenging ability are less likely to produce tiny gel components, so the loss of light transmittance of long optical paths becomes smaller, and those that do not contain benzene rings are less likely to generate colored components, and thus the loss of light transmittance of long optical paths is reduced. Preferred examples of the polymerization initiator include U1_: (third hexylperoxy 145347.doc •12·201030027 base)-3,3,5-trimethylcyclohexene, iota, over-emulsified isopropyl The mono-carbonic acid is equivalent to 0 (the third hexylperoxy)-cyclohexan---the s-there is a peroxidation-third hexyl group, and the monomer is compared with the monomer. The amount of the agent added is preferably from 0.01 to 0.5 parts by mass. The composition is further preferably 0.02 to 2 parts by mass. If the polymerization initiator is in the ‘County: ^. When the amount of addition is 〇.01 to 〇 5 parts by mass, the light transmittance and light resistance of the long optical path become good. (chain transfer agent)

Further, in the case of radical polymerization, di-ten'-alkyl mercaptan or 2,4_ transfer agent. 'It is also possible to add a total amount of 1G〇f of a known chain such as n-dodecyl mercaptan or second phenyl-4-methyl-1-pentene to the monomer, and the amount of the bond transfer agent is preferably added.疋 0.001 0.5 parts by mass 'and more preferably 〇〇〇 5 〇 2 parts by mass. When the amount of the bond transfer agent added is 0.001 to 0.5, the light transmittance in the long light path is increased, and the light resistance is improved.

The polymerization temperature at the time of polymerization of the styrene resin is preferably 9 〇 to i8 (rc, more preferably 95 to 17 (rC. If the polymerization temperature is 90 to 18 (rc, the light transmittance of the long pathlength and the light resistance) (The removal of dissolved oxygen) The styrene monomer and the solvent used in the optical molded article of the present embodiment are preferably subjected to polymerization after removing dissolved oxygen. As a method of removing dissolved oxygen, there is no In particular, a method of performing a foaming treatment using nitrogen gas or the like can be employed. If the dissolved oxygen is removed, the color of the molded body is colorless and the optical use is good for I45347.doc •13-201030027. In the case where the monomer copolymerized with the styrene monomer is copolymerized, it is preferred that the dissolved oxygen of the monomer copolymerizable with the stupid vinyl monomer is also removed and then polymerized. (Removal of foreign matter) Further, the styrene monomer and the solvent used in the optical molded article of the present embodiment are preferably subjected to polymerization after removing foreign matter. The method for removing foreign matter is not particularly limited, and may be carried out by a filter. Method of filtering, etc. If the foreign matter is removed, the light transmittance of the long optical path becomes high. In addition, when the monomer copolymerizable with the styrene monomer is copolymerized, it is preferable to be compatible with the styrene system. The styrene-based resin of the present invention can be polymerized by a known method such as an injection molding method, an extrusion molding method, or a solvent casting method. It is formed into an optical molded body, and particularly preferably an injection molding method or an extrusion molding method. The molding conditions are not particularly limited, but it is preferably formed at 200 to 30 (rc). [Light guide plate] The use of the optical molded article of the embodiment includes a light guide plate, a diffusion plate, a lens, etc. In particular, the optical molded article of the present embodiment has less loss of light transmittance in a long optical path, and particularly for 4 〇〇. Since the light having a wavelength of nm or higher has good light resistance, it is useful as a light guide plate for a liquid crystal display or a light guide plate for illumination, especially as a light source of 145347.doc -14. 201030027. The light guide plate for a liquid crystal display device has a thickness of the light guide plate of the present embodiment. Preferably, the thickness of the light guide plate is 0 to 8 mm, and more preferably 0.4 to 5 turns. The light guide plate having the above thickness can be used as the light guide plate. Among the above, it is effective to introduce sufficient light into the light guide plate for a large display, and to have sufficient rigidity in operation.

In the light guide plate of the present embodiment, organic light such as crosslinked acrylic particles, crosslinked styrene particles, or Wei resin particles can be blended as other components within the range not impairing the object of the present embodiment. A diffusing agent, an inorganic light diffusing agent such as a sulfuric acid pot, calcium carbonate or titanium oxide. [Light-diffusing body] When the use of the optical molded article of the present embodiment is a light-diffusing body, the optical properties such as total light transmittance (or light transmittance) and diffusivity are also improved. Therefore, a light diffuser used for various purposes such as illumination can be used. As a method of diffusing light as a light-diffusing body, various methods such as a method of kneading a light-diffusing agent, a method of forming a surface, and a method of applying a light-diffusing agent to a surface can be employed. As the light-diffusing agent, an organic light diffusing agent such as crosslinked acrylic particles, crosslinked styrene-based particles, or a ceramic light diffusing agent such as barium sulfate, carbonic acid or titanium oxide can be used. When the cross-linked acrylic acid particles, the parent-linked vinyl-based particles, the asahicin-fired resin particles, and the calcium carbonate are used as a light-diffusing body, the balance of optical properties such as total light transmittance and diffusivity is good, so that it is preferable. . The content of the light diffusing agent in the light diffuser is not particularly limited, and if it is contained in the range of 〇145347.doc •15·201030027 mass/〇 or more and 10 mass y〇 or less, the total light transmittance and the diffusivity are respectively obtained. A light diffuser that is excellent or has a good balance between the two. By containing 0.1% by mass or more of the light diffusing agent, it is possible to have a high diffusing property, and by setting it as 1% by mass or less, the total light transmittance is less reduced as the light diffusing body contains the light diffusing agent. As the method, a known method such as extrusion molding can be employed. In the light-diffusing body of the present embodiment, less than 0.5 part by mass of a known antioxidant, a light stabilizer, a lubricant, a plasticizer, and an antistatic agent may be added to 1 part by mass of the styrene resin. , fluorescent brightener, fluorescent material, light storage material. When the above additive is less than 5 parts by mass, the optical properties such as total light transmittance (or light transmittance) or diffusivity are lowered by /J. <Operation and Effect> The effects of the optical molded article of the above embodiment, in particular, the light guide plate and the light diffuser will be described. The optical molding system of the above-described embodiment is formed by molding a styrene resin obtained by polymerizing a styrene monomer having a polymerization inhibitor of less than 10 ppm and a phenylacetylene compound of 50 ppm or less. . Since the optical molded article of the above embodiment has low hygroscopicity, it has little distortion or dimensional change, and the loss of light transmittance in a long optical path is small, and the light resistance is good. In particular, by making the above-mentioned ethylene-based resin a styrene-(meth)acrylate-based copolymer, warpage or dimensional change and light transmission in a long optical path can be obtained. 145347.doc 201030027 Balance of light transmittance and light resistance Better results. Further, by subjecting the polymerization reaction to a radical solution polymerization reaction, the effect of reducing the amount of the initiator or the auxiliary agent remaining in the styrene-based resin and increasing the light transmittance or light resistance of the long path can be obtained.

In the optical molded article of the above-described embodiment, since the light transmittance in the long optical path is small, and the light having a wavelength of 4 nm or more is excellent in light resistance, it is used as a light guide plate or illumination for a liquid crystal display. The light guide plate is useful, especially as a light guide plate for a large liquid crystal display. Further, the optical molding system of the above-described embodiment also has excellent optical properties such as total light transmittance (or light transmittance) or diffusivity. Therefore, it is useful as a light diffuser used for various applications such as illumination. In the above, the optical molded article of the present invention, in particular, the light guide plate and the light diffusing body have been described. However, the present invention is not limited to the embodiments. For example, the molded article for optics of the present invention is not only preferably used for medium to large displays due to warpage or dimensional change, but can also be preferably used for small displays requiring precision scales. It can be preferably used for lighting fixtures or display appliances other than displays. The molded article for optics of the present month can also be obtained by a manufacturing method including the following steps. A method for producing a molded article for photo-imaging, comprising: a step of preparing a styrene-based monomer; and a step of reducing a polymerization inhibition sword contained in the styrene-based monomer to less than 1 ppm; a step of reducing the phenylacetylene compound 145347.doc 201030027 to 50 ppm or less; a polymerization reaction step of obtaining a styrene resin by polymerization of a styrene monomer; and forming a styrene resin Forming step. The optical molded article obtained by the above-described production method has less hygroscopicity, less warpage or dimensional change, less loss of light transmittance in a long optical path, and good light resistance. [Examples] Hereinafter, the details of the optical molded article of the present invention, particularly the light guide plate and the light diffuser, will be described using the examples, but the present invention is not limited to the following examples. [Styrene-based monomer] First, the styrene-based monomers used in the examples and comparative examples will be described. (Styrene-1) Industrial styrene was prepared, and as a result, it was found to contain 12 ppm of 4-tert-butyl catechol as a polymerization inhibitor, and 130 ppm of phenylacetylene as an impurity. The industrial styrene is subjected to a hydrogenation treatment in the presence of a hydrogenation catalyst, and the phenylacetylene contained therein is selectively hydrogenated, and then subjected to a vacuum distillation to obtain 4 - 2 butyl phthalic acid. Xia Weida 0.1 ppm, and phenylethyl fast content of 10 ppm of styrene-1. (Styrene-2) 4-Terbutyl phthalic acid was added to styrene-1 to obtain styrene-2 having a content of 4 ppm of butyl catechol of 7 ppm. (styrene·3) 145347.doc -18- 201030027 Add 4-tert-butyl phthalate to styrene-1 to obtain phenylethyl bromide with a content of 12 ppm of butyl catechol Thin _3. (Styrene-4) Phenylacetylene was added to styrene-1 to obtain styrene-4 having a stupid block content of 43 ppm. (Styrene-5) Phenylacetylene was added to styrene-1 to obtain styrene-5 having a phenylacetylene content of 130 ppm. ® [(Meth)acrylate monomer] (MMA-1) Next, the (meth)acrylate monomer will be described. Industrial methyl methacrylate was prepared, and it was found that it contained 5 ppm of Topano as a polymerization inhibitor as μμα. [Example 1] 52 parts by mass of the above-mentioned styrene, 48 parts by mass of the above-mentioned mma-b. 12 parts by mass of ethylbenzene as a solvent were mixed, and nitrogen gas was used for foaming to remove dissolved oxygen. The supernatant was filtered using a 10 melon filter to prepare a raw material solution. Then, a first fully mixed reactor having a volume of about 5 liters, a second fully mixed reactor having a volume of about 15 liters, a tower plug flow reactor having a volume of about 40 liters, and The devolatilizer with the preheater is connected in series. 0.03 parts by mass of 1,1_two (Third Hexyl Peroxide)-3⁄4 hexane (perhexa HC manufactured by Nippon Oil & Fats Co., Ltd.), and 0.015 145347.doc •19-201030027 were mixed in the raw material solution. - a mercaptan thiol (manufactured by Kao Corporation, and introduced at a rate of 6 kg per hour to the first fully mixed reactor where the temperature is controlled to be priced. Further in the mixer of the first-completely mixed reactor) The reaction was carried out at a rotation speed of 3 〇 0. The reaction liquid was continuously withdrawn from the first-completely mixed reactor, and was introduced into a second fully mixed reactor at a temperature (four) of 125 ° C. The rotation speed of the mixer of the two-mixed reactor is the reaction of the first-lower reaction. The reaction liquid is continuously extracted from the second complete-mixing reactor, and is introduced to give 125 art to 16 art in the direction of flow. In the tower plug flow type reactor adjusted by the temperature gradient method, the reaction liquid is heated by a preheater, and is introduced into a devolatilization tank having a temperature of 24 (rc and controlling the pressure to i G kpa). While removing solvent or not reacting The volatile component of the body is then extracted by a gear pump, and extruded in a strand shape, and cut while cooling, thereby obtaining a powdery stupid vinyl resin. Further, the particulate matter is contained in the fine powder system. The styrene resin obtained has been confirmed to have Mw = 丨80,000, Mw/Mn 18, and the total amount of the monomer and solvent remaining in the styrene resin is less than 1000 ppm. The powder was less than 3 ppm. Further, the powder was calculated by using a metal mesh of a Taylor 2 mesh and sieving 100 g of the styrene resin for 5 minutes, at which time it was passed through a metal mesh. The amount of powdered powder was measured. The pellets were formed by a motor injection molding machine (manufactured by Nippon Steel Works, Ltd.) 145347.doc 201030027 J350ELIII at a forming temperature of 270 ° C to obtain a longitudinal direction of 292.5 mm and a lateral direction of 220 mm. A molded article having a thickness of 2 mm. The optical properties of the obtained molded article were evaluated. The results are shown in the table. [Example 2] styrene-1 was 40 parts by mass, and MMA-1 was 60 parts by mass. In addition to 'implementation and implementation The results are shown in the same manner. The results are shown in Table J. [Example 3] The same procedure as in Example 1 except that the styrene-1 was 11 parts by mass and the MMA_丨 was 89 parts by mass. The results are shown in Table 1. [Example 4] The same procedure as in Example 1 was carried out except that styrene-1 was used in an amount of 100 parts by mass and MMA-1 was used as the mass%. The results are shown in the following. [Example 5] The same procedure as in Example 1 was carried out except that styrene-2 was used instead of phenethyl bromide. The results are shown in Table i. [Example 6] The same procedure as in Example 1 was carried out except that styrene-4 was used instead of styrene-1. The results are shown in Table i. Further, the evaluation of the characteristics of the above-mentioned molded body was carried out by the following method. (1) polymerization inhibitor (4-tert-butyl phthalate) = 5 NaOH and added, mixed, the color of the solution hop 2 = measured absorbance (wavelength · nm), and according to the pre-preparation The standard curve is used to calculate the yield 145347.doc -21- 201030027 (2) Residual monomer, residual solvent, and phenylacetylene are determined by GC (Gas Chromatography) as described below. The measurement was carried out. Device name: GC12A FID detector (flame ionization detector) manufactured by Shimadzu Corporation. Column: glass column 03 mm><3 m Filler: polyethylene glycol Carrier gas: nitrogen

Temperature: column 115 ° C, injection port 220 ° C 0.5 g of sample particles, 0.001 g of cyclopentane, N,N-dimercaptocarbamide were dissolved, and the measurement was carried out using cyclopentane as an internal standard. (3) Hygroscopicity Using the formed plate, the saturated water absorption rate (unit: %) was determined by the A method in accordance with JIS K7209. Those who did not reach 1.5% were evaluated as qualified. (4) Haze (haze) For the 2 mm thickness portion of the formed plate, the haze (unit: %) was measured in accordance with JIS K7 105 using a fog meter (NDH2000 manufactured by Nippon Denshoku Industries Co., Ltd.). Those who did not reach 0.3% were evaluated as qualified. (5) Transparency of light path (light transmittance) The end face of the formed plate was ground using a gate processing machine GCPB manufactured by Megaro Technica Co., Ltd. The transmittance (unit: %) of light transmitted vertically through the polished surface was measured using a long path length measuring machine ASA-300A manufactured by Nippon Denshoku Industries Co., Ltd. (6) Refractive index 145347.doc -22- 201030027 The refractive index was measured using an Abbe refractometer (Abb refractometer 2-T manufactured by Atago Co., Ltd.) at a thickness of 2 mm of the formed plate. (7) Reflectance The reflectance (unit: %) was calculated by the following formula using the refractive index measured in (6). [Number 1] 反射 Reflectance (1+refractive index>2

(8) Transparent loss rate of long pathlength The transparent loss rate (unit: %) was calculated by the following formula using the light transmittance of the long path length measured in (5) and the reflectance calculated in (7). Furthermore, multiplying the reflectance by two times indicates both the light incident surface and the light exit surface. Those who did not reach 8% were evaluated as qualified. [Number 2] Transparent optical mussel rate for long path length = 100 - long light path light transmittance - (reflectance χ 2) (9) Light resistance is called the use of single-extrusion extruder PMS40 manufactured by IKG, at the cylinder temperature Under the conditions of 230 ,, the 紫外线 H VH5 manufactured by Mitsubishi Rayon Co., Ltd., and the UV absorber Tinuvin 制造 manufactured by Ciba Specialty Chemicals Co., Ltd., and Clariant Japan (by mass ratio of 99: 〇·5: 0.5) The company's light stabilizer, Hostavin PR-25, is used to obtain a resin for UV filters. It was manufactured by Nippon Steel Works Co., Ltd. using an electric injection molding machine. The resin was molded at a forming temperature of 270 ° C to obtain a longitudinal direction of 292·5 mm, a lateral direction of 220 mm, and a thickness of 2 Mm UV filter. About 145347.doc -23- 201030027 This UV filter has confirmed that light with a wavelength of less than 400 nm is almost opaque. The molded article of the styrene resin obtained in the examples and the comparative examples was superposed on the ultraviolet light filter, and a weather meter Ci65A manufactured by Atlas Co., Ltd. was used at a temperature of 63. (:, under the condition of an irradiation intensity of 0.35 W/m2 (intensity at 340 nm), self-prepared and external light; the side of the light-receiving sheet is irradiated with light of the xenon source for 2 。 hours. That is, the transmission ultraviolet light is filtered. The light of 400 nm or more of the sheet is irradiated with a molded body of a styrene-based resin, and the color difference meter Σ80 manufactured by Sakamoto Electric Co., Ltd. is used, and the claws of the 2 claw portions of the light-irradiated molded body are measured in accordance with JIS K7105. Value (unit 2), and calculate the source according to the following formula. The person who has not reached the 评价 is evaluated as qualified. △ b = b value after 200 hours of irradiation b value before irradiation 145347.doc 24· 201030027 Comparative Example 3 1 1 Styrene-5 | | &lt;0.1 1 CN 0.17 1 cn Ο 83.7 1.54652 I \〇l&gt; CN Comparative Example 2 | Styrene-3J inch 1-H 〇CN 0.17 _ 1 CO ο 82.5 1.54652 VO — cn 00 inch Ο Ltb is compared with Example 1 1 丨 &lt;0.1 ο 〇Ο 丨1.77 - 1 CN Ο 87.9 1.494 a rn rn - ο Example 6 | Styrene-4 I &lt;0.1 CN L0J7 I (S ο 84.7 1.54652 VO ο | Example 5 ! | Styrene-2 I Ο (N 〇·ΐ7 1 CN Ο 83.6 1.54652 'Ο (N (Ν 实施 Example 4 | Styrene-1 丨&lt;〇] Ο T*H 〇rH 〇0.09 (N Ο m oo 1.595 ιτί in v〇Ο Example 3 Styrene-11 1 &lt; 〇.ι 1 Ο iH 1—H ON 00 0.58 (N Ο 87.7 1.50511 — (N inch ο Example 2 styrene -1 1 &lt;〇] 1 ο o inch § 0.21 CN Ο 1.5344 — — ο Example 1 Styrene-1 1 &lt;〇.ι 1 Ο (N 〇·17 1 CN Ο 86.4 1.54652 — ο a α & ε α ο. Wt% Wt% 1 1 I Type of styrene Polymerization inhibitor Phenylethyl fast compound styrene MMA Hygroscopic transparency (Haze) Long pathlength transparency (light transmittance) Refractive index reflectance Transparent light loss and light fastness of long optical path (Ab) -25-145347.doc 201030027 It is observed that the optical forming system of the embodiment of the present invention has low hygroscopicity and a loss of light transmittance in a long optical path. Less and good light resistance. [Comparative Example 1] The styrene-1 was set to 0 mass%, and the MMA-1 was set to 100 parts by mass. The same way. The results are shown in the same manner as in Example 1 except that styrene-3 was used instead of phenelzine. The results are shown in the table. [Comparative Example 3] The same procedure as in Example 1 was carried out except that styrene-5 was used instead of styrene. The results are shown in Table 1. <Inspection> The optical molded article according to the embodiment of the present invention has less hygroscopicity or less dimensional change, less loss of light transmittance in a long optical path, and good light resistance of 400 nm or more. . In Comparative Example 1, since only the acrylic resin was used, the hygroscopicity was significantly higher. Further, in Comparative Example 2, the light transmittance of the long optical path was low, and the light transmittance loss of the long optical path was large. Further, it was found that the value of Δ1) was large and the light resistance was poor. The reason for this is considered to be that the content of the polymerization inhibitor is 1 〇 ppm or more. Further, in Comparative Example 3, it was found that the transparency loss of the long path length was large, and in particular, the value of Ab was significantly large and the light resistance was poor. This is considered to be because the content of the phenylacetylene compound is 5 〇{){) 111 or more. 145347.doc -26-201030027 As described above, the molded article for optics of the present invention has less fascination or dimensional change due to lower hygroscopicity, higher light transmittance in a long optical path, and good gravitational properties. Further, when the optical molded article of the present invention is used as the light guide plate, it is used as a light guide plate for a liquid crystal display or a light guide plate for illumination, and is particularly resistant to light of a wavelength of 400 nm or more. Since it is good in performance, it is useful as a light guide plate for a large liquid crystal display. ® [Light diffuser] The details of the light diffuser of the present invention will be described using the examples, but the present invention is not limited to the following examples. [Styrene-Based Resin] The styrene-based resins used in the examples and comparative examples will be described. The styrene resin obtained by the method of Example 1 is referred to as styrene resin 1. The styrene resin obtained by the method of Example 2 is referred to as φ styrene resin 2. The styrene resin obtained by the method of Example 3 is referred to as a styrene resin 3. The styrene-based resin obtained by the method of Example 4 is referred to as styrene-based resin 4. The styrene-based resin obtained by the same method as that of Example 1 using styrene 2 is referred to as a styrene-based resin 5. The styrene resin obtained by the same method as in Example 2 using styrene 2 is referred to as a styrene resin 6. A styrene-based resin obtained by the same method as that of Example 3 using styrene 2 is referred to as a styrene-based resin 7. The styrene resin which was obtained by using the styrene 2 and obtained by the same method as in Example 4 was called styrene tree 145347.doc • 27· 201030027 Grease 8. A styrene-based resin which is obtained by using the same method as in the example of the styrene 3 is referred to as a styrene-based resin 9. The styrene resin obtained by the same method as in Example 2 using styrene 3 is referred to as a styrene resin 10. A styrene-based resin obtained by the same method as that of Example 3 using styrene 3 is referred to as a styrene-based resin. A styrene-based resin obtained by the same method as in Example 4 using styrene 3 will be used. The resin is referred to as styrene-based resin 12. The styrene-based resin obtained by the same method as in Example! using styrene 4 is referred to as styrene-based resin 13. Styrene 4 will be used and by way of Examples 2 The styrene resin obtained by the same method is called styrene tree ruthenium 14. The styrene resin which is obtained by the same method as in Example 3 using styrene 4 is called styrene resin. 15. Styrene 4 was used and obtained by the same method as in Example 4, which was called a styrene resin 16. Styrene 5 was used and styrene obtained by the same method as in Example 将 was used. The resin is referred to as a styrene resin 17. The styrene resin obtained by the same method as that of Example 2 using styrene 5 is referred to as a styrene resin 18. Styrene 5 will be used and by way of Examples 3 styrene resin obtained by the same method The styrene resin was used. The styrene resin obtained by the same method as that of Example 4 using styrene 5 was referred to as a styrene resin 20. [Example 7] A pair manufactured using Toshiba Machine Co., Ltd. The shaft extruder Τεμ·35Β, at the front end of 145347.doc -28- 201030027 at a temperature of 230 ° C, mixing and mixing styrene resin 1 with calcium carbonate (as a special special chemical (stock) made as a light diffusing agent ( Product Name:

Lumipearl DSN-7) was allowed to have a mixing ratio of 96% by mass: 4% by mass, and a resin composition having a particle shape was obtained. Using a injection molding machine J140AD-180H manufactured by Nippon Steel Works Co., Ltd., the pellet-shaped resin composition was molded under the conditions of a cylinder temperature of 230 ° C and a mold temperature of 60 ° C to obtain a longitudinal direction of 90 mm. A molded body having a lateral direction of 90 mm and a thickness of 2 mm. [Example 8] A styrene-based resin 1 was used as a styrene-based resin, and a cross-linked acrylic particle (product name: Tech_Polymer MBX-8) produced by Sekisui Chemicals Co., Ltd. was used as a light diffusing agent. Other than 'in the same manner as in Example 7. [Example 9] . 98% by mass of styrene resin was used! A methacrylic resin particle (product name: ToSpea H 12 Å) manufactured by using 2% by mass of iMomentive Performance Materials was used as a light diffusing agent, except that it was carried out in the same manner as in Example 7. [Example 10] The styrene-based resin 2 was used as the styrene-based resin, and the cross-linked styrene particles (product name: "匕" manufactured by the Sekisui Chemicals Co., Ltd. were used.

Polymer SBX_8) was carried out in the same manner as in Example 7 except that it was a light diffusing agent. [Example 11] A styrene-based resin 2 was used as a benzene (tetra) resin, and calcium carbonate (product name: LUmipeari DSN_7) manufactured by a special 145347.doc -29-201030027 special chemical company was used as a light diffusing agent. Other than this, it was carried out in the same manner as in Example 7. [Example 12] 98 mass was used. The styrene-based resin 2 is a styrene-based resin, and 2% by mass of a sulphur oxide resin particle (product name: Tospearl 120) manufactured by Momentive Performance Materials is used as a light diffusing agent, and Example 7 was carried out in the same manner. [Example 13] A styrene resin 3 was used as a styrene resin, and a crosslinked styrene particle (product name: Tech_Polymer SBX-8) manufactured by Sekisui Kogyo Co., Ltd. was used as a light diffusing agent. Except in the same manner as in Example 7, except that. [Example 14] A styrene-based resin 3 was used as a styrene-based resin, and carbonic acid (manufactured by Lumipearl DSN-7) manufactured by a fundamental special chemical (product) was used as a light diffusing agent. Example 7 was carried out in the same manner. [Example 15] The styrene-based resin 4 was used as the styrene-based resin, and the crosslinked acrylic particles (product name: Teeh_Polymer MBX-8) produced by the Sekisui Chemicals Co., Ltd. were used as the light diffusing agent. Except in the same manner as in Example 7, except that. [Example 16] A styrene-based resin 5 was used as a styrene-based resin, and a carbonated dance (product name: Lumipearl DSN-7) manufactured by a radical special chemical (product) was used as a light diffusing agent of 145347.doc -30-201030027, Except for this, it was carried out in the same manner as in Example 7. [Example 17] A styrene-based resin 5 was used as a stupid vinyl resin, and a crosslinked acrylic particle (product name: Tech_Polymer MBX-8) produced by Sekisui Chemicals Co., Ltd. was used as a light diffusing agent. Except that the same procedure as in Example 7 was carried out. [Example 18] 98% by mass of a styrene-based resin 5 was used as the styrene-based resin, and the use of a 2 mass 〇/〇i Momentive Performance Materials-based alumite resin particle (product name: T〇spearl 12〇) was used. Other than the above, 'the light diffusing agent was carried out in the same manner as in Example 7. [Example 19] A styrene-based resin 6 was used as a styrene-based resin, and a crosslinked styrene particle (product name: Tech_Polymer SBX-8) manufactured by Sekisui Chemicals Co., Ltd. was used as a light diffusing agent. Except in the same manner as in Example 7, except that. [Example 20] A stupid vinyl resin 6 was used as a styrene resin, and a saponic acid (product name: Lumipearl DSN-7) manufactured by a fundamental special chemical (product name: Lumipearl DSN-7) was used as a light diffusing agent 'other than This was carried out in the same manner as in Example 7. [Example 21] 98% by mass of a styrene-based resin 6 was used as a styrene-based resin, and aurethane resin particles (product name: Tospearl 120) manufactured by using 2% by mass of iM〇mentive Performance Materials was used as a light diffusing agent. Except this 145347.doc -31- 201030027, 'in the same manner as in Example 7. [Example 22] The styrene-based resin 7 was used as the styrene-based resin, and the crosslinked styrene particles (product name: Polymer SBX-8) manufactured by Sekisui Chemicals Co., Ltd. were used as the light diffusing agent. This was carried out in the same manner as in Example 7. [Example 2; 3] A styrene-based resin 7 was used as a stupid vinyl resin, and a carbon-acid|bow (product name: Lumipearl DSN-7) manufactured by a fundamental special chemical (product name) was used as a light diffusing agent' Other than this, it was carried out in the same manner as in Example 7. [Example 24] The styrene-based resin 8 was used as the styrene-based resin, and the crosslinked acrylic particles (product name: Tech_Polymer MBX-8) produced by Sekisui Chemicals Co., Ltd. were used as the light diffusing agent. Except in the same manner as in Example 7, except that. [Example 25] A styrene-based resin 13 was used as the styrene-based resin, and a decomposing acid (product name: Lumipearl DSN-7) manufactured by the radically special chemical (manufactured by the company) was used as a light diffusing agent, and This was carried out in the same manner as in Example 7. [Example 26] The present Baked resin 13 was used as the styrene-based resin, and the crosslinked acrylic particles (product name: Teeh_ Polymer MBX-8) produced by Sekisui Chemicals Co., Ltd. were used as the light diffusing agent. Except for this, it was carried out in the same manner as in Example 7. 145347.doc -32- 201030027 [Example 27] 98% by mass of styrene-based resin 13 was used as a styrene-based resin, and 2% by mass of iMomentive Performance Materials made of a sulphur oxide resin particle (product name: Tospearl 120) The same procedure as in Example 7 was carried out except that the light diffusing agent was used. [Example 28] A styrene-based resin 14 was used as a styrene-based resin, and crosslinked styrene particles (product name: Tech-# Polymer SBX-8) manufactured by Sekisui Chemicals Co., Ltd. were used as a light diffusing agent. Except for this, it was carried out in the same manner as in Example 7. [Example 29] A styrene-based resin 14 was used as a styrene-based resin, and calcium carbonate (product name: Lumipearl DSN-7) manufactured by a radical special chemical (product name: Lumipearl DSN-7) was used as a light diffusing agent, and Example 7 was carried out in the same manner. [Example 30] 98% by mass of the styrene-based resin 14 was used as the styrene-based resin, and the alumite resin particles (product name: Tospearl 120) manufactured by 2% by mass of iMomentive Performance Materials were used as the light diffusing agent. Except for this, it was carried out in the same manner as in Example 7. [Example 31] A styrene-based resin 15 was used as a styrene-based resin, and a crosslinked styrene particle (product name: Tech-Polymer SBX-8) manufactured by Sekisui Chemicals Co., Ltd. was used as a light diffusing agent. Except for this, it was carried out in the same manner as in Example 7. 145347.doc •33-201030027 [Example 32] A styrene-based resin 15 was used as a styrene-based resin, and calcium carbonate (product name: Lumipeari DSN-7) manufactured by a fundamental special chemical (product) was used as a light diffusing agent. Except for this, it was carried out in the same manner as in Example 7. [Example 33] The styrene-based resin 16 was used as the styrene-based resin, and the crosslinked acrylic particles (product name: Tech_Polymer MBX-8) produced by Sekisui Chemicals Co., Ltd. were used as the light diffusing agent. Except in the same manner as in Example 7, except that. [Comparative Example 4] A styrene-based resin 9 was used as the styrene-based resin, and calcium carbonate (product name: Lumipearl DSN7) manufactured by the fundamental special chemical (product name) was used as the light diffusing agent, and the examples and examples were used. 7 is done in the same way. [Comparative Example 5] The styrene-based resin 9 was used as the styrene-based resin, and the crosslinked acrylic particles (product name: P kiss bribe mBX_8) produced by the Sekisui Chemicals Co., Ltd. were used as the light diffusing agent. This was carried out in the same manner as in Example 710. [Comparative Example 6] 98% by mass of styrene-based resin 9 was used as the styrene-based resin, and as a kiln-oxygen resin particle (product name: T〇spead 12〇) manufactured by 2 mass kMGmentive PerfGma (10) (4) s, Except for the light diffusing agent, the same procedure as in Example 7 was carried out. [Comparative Example 7] 145347.doc • 34 - 201030027 The use of styrene-based resin 1 〇 as a styrene-based resin, and the use of cross-linked styrene particles manufactured by Sekisui Chemicals Co., Ltd. (product name: Tech_ Polymer SBX) -8) The same procedure as in Example 7 was carried out except that the light diffusing agent was used. [Comparative Example 8] A styrene-based resin 10 was used as a styrene-based resin, and a saponic acid (product name: Lumipearl DSN·7) manufactured by a radical special chemical (product) was used as a light diffusing agent, and Example 7 was carried out in the same manner. ® [Comparative Example 9] 98% by mass of a styrene resin was used as a styrene resin, and 2 mass was used. The same procedure as in Example 7 was carried out except that the oxidized resin particles (product name: Tospearl 120) manufactured by Momentive Performance Materials was used as a light diffusing agent. [Comparative Example 10] A styrene-based resin 11 was used as a styrene-based resin, and a cross-linked styrene particle manufactured by a product of hydration φ finished product (product) was used (product name: Tech-

Polymer SBX_8) was carried out in the same manner as in Example 7 except that it was a light diffusing agent. [Comparative Example 11] The styrene-based resin 11 was used as the styrene-based resin, and the acid-destroying ginseng 5 (product name: Lumipearl DSN-7) manufactured by the fundamental special chemical (manufactured by the company) was used as the light diffusing agent. This was carried out in the same manner as in Example 7. [Comparative Example 12] The styrene-based resin 12 was used as the styrene-based resin, and the cross-linked acrylic particles (product name: Tech_ Polymer MBX-) manufactured by the finished product (stock) were used as hydrated 145347.d〇, 35-201030027. B) was carried out in the same manner as in Example 7 except that the light diffusing agent was used. [Comparative Example 13] The present ethylene-based resin 17 was used as a styrene-based resin, and calcium carbonate (product name: Lumipearl DSN-7) manufactured by a radical special chemical (product name: Lumipearl DSN-7) was used as a light diffusing agent. This was carried out in the same manner as in Example 7. [Comparative Example 14] The styrene-based resin 17 was used as the styrene-based resin, and the crosslinked acrylic particles (product name: Tech_Polymer MBX-8) produced by Sekisui Chemicals Co., Ltd. were used as the light diffusing agent. Except in the same manner as in Example 7, except that. [Comparative Example 15] 98% by mass of the styrene resin 17 was used as the styrene resin, and 2% by mass of the oxymethylene resin particles (product name: T〇spearl 12〇) manufactured by MGmentive Performance Materials was used as the light diffusing agent. Except for this, it was carried out in the same manner as in Example 7. [Comparative Example 16] The styrene-based resin 18 was used as the styrene-based resin, and the cross-linked styrene particles (product name: Tech_Polymer SBX-8) manufactured by Sekisui Chemicals Co., Ltd. was used as the light diffusing agent. Except in the same manner as in Example 7, except that. [Comparative Example 17] A styrene-based resin 18 was used as the benzene (tetra) resin, and calcium carbonate (product name: Lumipeari DSN_7) manufactured by the special 145347.doc 201030027 special chemical company was used as the light diffusing agent. 'In the same manner as in Example 7. [Comparative Example 18] 98% by mass of the present ethylenic resin 18 was used as the stupor-based resin, and 2% by mass of iMomentive Performance Materials manufactured by using a sulphuric acid resin particle (product name: Tospearl 120) was used as the light diffusion. The same procedure as in Example 7 was carried out except for the above. [Comparative Example 19] The use of styrene-based resin 19 as a styrene-based resin and the use of cross-linked styrene particles (product name: Tech_Polymer SBX-8) manufactured by Sekisui Chemicals Co., Ltd. as a light diffusing agent, Except for this, it was carried out in the same manner as in Example 7. [Comparative Example 20] A styrene-based resin 19 was used as a styrene-based resin, and carbonic acid (product name: Lumipeari DSN-7) manufactured by a fundamental special chemical (product name) was used as a light diffusing agent, and Example 7 was carried out in the same manner. [Comparative Example 21] A styrene resin was used as the styrene resin, and a crosslinked acrylic particle (product name: Tech-Polymer MBX-8) manufactured by Sekisui Chemicals Co., Ltd. was used as a light diffusing agent. Except for this, it was carried out in the same manner as in Example 7. Each of the molded articles of Examples 7 to 33 and Comparative Examples 4 to 21 was subjected to the following evaluation. (10) Total light transmittance, Haze The total light transmittance and Haze (unit: %) of the molded body were measured according to JIS K71〇5 ' using a fog meter (145347.doc -37·201030027 NDH5000, manufactured by Nippon Denshoku Industries Co., Ltd.). ). (11) Diffusion rate The light transmittance at each angle of the molded body was measured using a variable angle photometer (GC5000L manufactured by Sakamoto Denshoku Industries Co., Ltd.). Using the value of the light transmittance at a specific angle, the diffusivity (%) defined by the following formula (diffusion rate: JIS Z8113 No. 04100) is calculated. [Number 3] (Diffusion rate) (20° light transmittance> ^ (70° light transmittance) 1 (5° light transmittance)~jxl〇〇

Cos20° cos70e j/ [ cos5. J (12) Dispersion of illuminance The illuminance was measured by the method shown below in accordance with JIS C7612 using an illuminometer (IM-3 manufactured by TOKYO OPTICAL). The half value width (unit: cm) is used as the dispersion of the illuminance in the illuminance distribution in the horizontal plane of the vertical distance of 1 m from the molded body mounted on the illuminating object. [Measurement method of illuminance] Remove the cover attached to the LED illumination (the small reflector type manufactured by Toshiba Lighting &amp; Technology, LEL-SL5N-F 40 W), and attach the molded body (LED chip) The distance from the shaped body is 8 mm). The light was turned on in a dark place, and after standing for 30 minutes or more to stabilize the light source, the illuminance at a specific place was measured. (13) Light resistance The molded articles of Examples 7 to 33 and Comparative Examples 4 to 21 were used in the same manner as in the "(9) Light resistance" test. The results of the above examples and comparative examples are shown in Tables 2 to 6. 145347.doc -38- 201030027

Example 15 L styrene·ι I &lt;0.1 〇ο Η ο Stupid vinyl resin 4 Ό ON Pair 58.3 I 99.4 ' 69.5 1 -^ Example 14 Stupid ethylene-1 &lt;0.1 〇as 00 Styrene resin 3 Ό OS inch 52.8 99.5 89.7 〇 Example 13 Styrene-1 &lt;0.1 〇ON 00 Stupid vinyl resin 3 Ό Os inch 58.1 1 99.5 82.4 &lt;N 〇Example 12 Styrene-1 &lt;0.1 〇Ο S benzene Vinyl resin 200 00 On CN 59.2 , 99.3 1 78.5 〇 Example 11 Stupid ethylene-1 &lt;0.1 〇ο δ Styrene resin 2 VD Os inch 55.4, 99.4 1 78.8 宕〇 Example 10 | Styrene-1 1 &lt;0.1 〇ο s Styrene resin 2 v〇On inch 68.1 99.2 58.4 宕1-·^ Example 9 Indole styrene-1 &lt;0.1 苯乙烯 Styrene resin 1 OO OS (N 53.6 99.5 83.4 § 〇 Example 8 Styrene-1 &lt;0.1 〇CN Styrene Resin 1 Ό ON 78.3 99.0 50.0 g 〇 Example 7 Styrene-1 &lt;0.1 〇styrene resin 1 v〇〇\ 58.4 99.0 73.2 Ο 〇 S吟ε α ε α wt% wt% Wt% wt% wt% Wt% Wt% cm 1 φ| 黩Rongxiang ψ 4 φΗ 跻 跻 跻 跻 Ο Ο Ο Ο Ο 令 令 Ο Ο Ο Ο Ο Ο Ο Ο Ο Ο O O O O O O O i i i i i i i i i i i i 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 〇〇 〇〇 O Stupid vinyl resin 8 v 〇 σν 寸 99.2 ' ίο rn Example 23 Styrene-2 〇 〇 On OO Stupid vinyl resin 7 ο 寸 51.9 99.3 88.8 〇cn (N d Example 22 styrene - 2 〇 00 00 stupid vinyl resin 7 to 57.6 99.1 80.6 inch 〇 Example 21 styrene-2 〇〇 〇〇 S styrene resin 6 00 Ο ν (Ν 58.2 99.1 77.4 Example 20 stupid vinyl-2 〇〇 § stupid Vinyl resin 6 ν 〇〇 54.6 77.6 (N 〇 Example 19 styrene-2 〇〇 〇〇 stupid vinyl resin 6 Os inch 67.5 99.2 56.8 〇 1-^ m Example 18 styrene-2 〇 〇 CN benzene Vinyl resin 5 00 Os CN 00 1—^ in 99.4 1—^ Example 17 Styrene-2 Buddy &lt;N styrene resin 5 Os Inch 76.8 98 .8 48.1 § (N 〇Example 16 Styrene-2 〇2 &lt; N styrene resin 5 Ό 寸 57.6 98.9 72.2 〇 (N 〇 B α E α wt% wt% wt% wt% wt% wt % Wt% 1 cm 1 pro d|N 乡*&lt;〇Μ 屮U »w intercepting 蘅 rate rate ΦΙ W t0 loading aluminum &lt; Ο Ο case&lt;ζ 璲si 〇硪〇〇Ο musk朵^· Φ4 i-4 ΐ4 4h X 夺-40- 145347.doc 201030027

&lt; Example 33 1 Stupid ethylene-4 I &lt;0.1 3 ο r·^ ο Stupid vinyl resin 16 Os inch V〇V-) 66.2 inch 〇 Example 32 Stupid ethylene-4 &lt;0.1 Os Benzene Vinyl resin 15 Ό ON inch 50.9 99.3 | 87.6 实施 Example 31 Styrene-4 &lt;0.1 ο 00 Stupid vinyl resin 15 Ό Os inch 56.8 98.9 | 80.4 inch 〇 Example 30 Styrene-4 &lt;0.1 ο s Styrene resin 14 00 Os 00 VI 〇 〇 1- I 76.2 Η Η CO Example 29 Styrene-4 &lt;0.1 ο δ Styrene resin 14 VO Os inch OS 〇\ 宕1-^ rn Example 28 Stupid ethylene-4 &lt;0.1 ο s styrene resin 14 Ό a 寸 66,4 99.2 1 56.6 〇»—Η inch 〇 Example 27 Styrene-4 &lt;0.1 CN Stupid vinyl resin 13 00 OS 50.8 99.2 1 1 81.5 〇 Example 26 Styrene-4 &lt;0.1 (Ν 苯乙烯 styrene resin 13 v 〇 Os inch 75.6 98.8 1 47.8 § rn Example 25 Styrene-4 &lt; 0.1 CN &lt;η Μ Stupid ethylene Resin 13 VO ON inch 56.8 98.9 70.3 〇cn 〇unit Β g B &amp; wt% wt% ; wt% wt% wt% wt% wt% cm 1 m|N 骚者ΐφή 屮ΦΙ 戥jd # 乡w rate w !〇爱Φ &lt; love towering tO 敦&lt; love i4 驽斋¥ tO 2 Ο Ο 棻 棻 a 2 ϊ4 Φ4 Μ X Le-41 - 145347. Doc 201030027 in Comparative Example 12 Styrene-3 inch 〇〇»—&lt; ο Styrene resin 12 Os inch 55.3 65.6 1—^ rn 〇Comparative example 11 Styrene-3 inch 〇Os 00 Stupid vinyl resin 11 Ό On Inch 50.5 99.1 86.5 ι (N 〇Comparative Example 10 1 Styrene-3 inch 〇Η OS OO Stupid vinyl resin 11 Ό Os inch αί 〇\ __Ί21__! 〇Comparative Example 9 1 Styrene-3 inch 〇〇S Stupid vinyl Resin 10 00 ON CS 57.6 as 〇\ 76.5 〇»—Η CN 〇Comparative Example 8 Styrene-3 inch 〇〇 stupid vinyl resin 10 v〇On inch 53.6 98.9 75.5 Comparative Example 7 Styrene-3 inch 〇〇 stupid ethylene Resin 10 ON inch 65.7 as Os 〇CN 〇i Comparative Example 6 "styrene - 3 inch 〇 (Ν styrene resin 9 00 On Os σ \ 80.6 ΓΛ Comparative Example 5 Styrene-3 inch styrene resin 9 v〇ON inch 98.7 46.6 ι g 〇Comparative example 4 Styrene-3 inch 〇(Ν Stupid vinyl resin 9 Os inch in 98.9 ο ο 1—^ inch 〇 unit ε α ε α wt% wt% Wt% wt% wt% wt% Wt% cm 1 Φ4 *Kr\ ♦1 Gong ΐΐ Ι N N N N N N N N N N N N N N N N N & & &&; install tO 璲 璲 ± i 0 : Umbrella tO s Ο 骛 骛 Ν ϊ 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 42 Resin 20 v〇ON inch 55.3 98.8 65.7 〇r·^ Ο) 〇Comparative Example 20 Styrene-5 &lt;0.1 ΟΝ 00 00 Styrene resin 19 v〇On inch 50.1 99.2 I 86.4 »Τ) 〇Comparative Example 19 Styrene-5 &lt;0.1 ΟΝ 00 Styrene Resin 19 Ό ON Inch 55.8 98.9 79.6 ν〇Ο Comparative Example 18 Styrene-5 &lt;0.1 Ο δ Styrene Resin 18 00 ON ΓΊ 56.2 98.9 〇Inch Ο Example 17 Styrene-5 &lt;0.1 1 〇ΓΟ ί-Η ο S Styrene resin 18 Ό Os inch 53.2 1 ' 98.9 75.5 ο ο Comparative Example 16 Styrene-5 &lt;0.1 沄ο Styrene resin 18 Inch 65.7 55.5 〇00 ο Comparative Example 15 Π Styrene-5Π &lt;0.1 (Ν Stupid vinyl resin 17 00 Os (Ν 49.5 98, 9 1 79.5 〇ο Comparative Example 14 Styrene-5 1 &lt; 0.1 CN in benzene Vinyl resin 17 v 〇 Os inch 74.6 98.7 1 46.8 ο Comparative Example 13 Styrene-5 &lt; 0.1 130 &lt; Ν «Π Styrene resin 17 VO 55.4 98.9 1 69.8 〇ο ε & ε α Wt% wt% Wt% wt% wt% wt% wt% cm 1 黩蓉♦1 屮屮# 騄λ3 Township m φ| Μ w Paint Ο Pack 4 &lt;1 Love Ο Love Love V? 斋±1 Ο Ο Ο 骛 Musk a ttsj ί-4 i4 Φ4 X m -43- 145347.doc 201030027 &lt;Exploration&gt; As shown in Tables 2 to 4, the optical forming system of the embodiment of the present invention has a good total light transmittance or diffusivity, and 4 The wealth above 〇〇 nm is good. The reason why the diffusivity is lowered in the comparative example is that the amount of the inhibitor is 10 ppm or more or the amount of the phenylacetylene compound is 5 〇 ppm or more. It is considered that the reason why the light resistance is large in the comparative example is that the amount of the polymerization inhibitor is 10 ppm or more, and the content of the phenylacetylene compound is 50 ppm or more. As described above, the light diffusing system of the present invention has a good total light transmittance or diffusivity and good light resistance. Therefore, it is useful as a light diffuser used for various applications such as illumination. Further, since light having a wavelength of 400 nm or more is excellent in light resistance, it is also useful as a light diffuser (diffusion plate or diffusion cover) using LED as a light source. 0 145347.doc • 44-

Claims (1)

201030027 VII. Patent application scope: ι_ An optical molded body obtained by polymerizing a styrene monomer having a polymerization inhibitor of less than 1 ppm and a phenylethyl fast compound of 50 ppm or less. A styrene resin is molded. 2. If requested! The optical molded article wherein the styrene resin is a styrene-(fluorenyl) acrylate copolymer. 3. The optical molded article according to claim 1 or 2, wherein the polymerization reaction is a free radical solution polymerization. 4. A light guide plate which is obtained by using the optical molded body according to any one of claims 1 to 3. A light-diffusing body which is obtained by using the optical molded article according to any one of claims 3 to 3. 6. The light-diffusing body of claim 5, which comprises 0. 丨 mass% or more, ι 〇 / 〇 or less selected from the group consisting of crosslinked acrylic particles, crosslinked styrene particles, bismuth oxide resin particles, and carbonic acid At least _ kinds of light diffusing agents of the group of calcium. I45347.doc 201030027 IV. Designation of representative drawings: ' (1) The representative representative of the case is: (none) (2) The symbol of the symbol of the representative figure is simple: 5. If there is a chemical formula in this case, please reveal the characteristics that can best show the invention. Chemical formula: (none) 145347.doc