TW201238756A - Light reflection sheet, resin composition for producing the light reflection sheet, and method for producing the light reflection sheet - Google Patents

Abstract

The invention provides a light reflection plate having excellent light reflection characteristics. The light reflection plate contains a polyolefin series resin of 100 weight %(wt%) and a coated titanium oxide of 20 wt% to 120 wt%, wherein the coated titanium oxide is formed by using a coated layer containing aluminum oxide and Si oxide to coat a surface of titanium oxide, and the moisture content thereof is under 0.5wt%. The coated titanium oxide has an excellent dispersibility as agglomeration of the coated titanium oxide with moisture content under 0.5wt% is inhibited. Therefore, the light reflection plate formed by the above coated titanium oxide makes the coated titanium oxide micro-dispersed in a polyolefin series resin, and can bring out excellent light reflection characteristics.

Description

201238756 VI. [Technical Field] The present invention relates to a light reflecting plate having excellent light reflection performance, a resin composition for forming the light reflecting plate, and a method of manufacturing a light reflecting plate . [Prior Art] In recent years, liquid crystal display devices have been used as display devices for various purposes. The shai liquid crystal display device is provided with a backlight unit on the back surface of the liquid crystal cell. The backlight unit includes a light-emitting source such as a cold cathode tube or a light emitting diode (LED), a lamp reflector, a light guide plate, and a light reflecting plate disposed on a rear side of the light guide plate. This light reflection plate serves to reflect light leaking to the rear side of the light guide plate toward the liquid crystal cell side. As the light reflecting plate, a metal thin plate containing aluminum or stainless steel, a film obtained by depositing silver on a polyethylene terephthalate film, a metal foil in which an aluminum foil is laminated, a porous resin sheet, or the like can be used. . Further, as the light-reflecting sheet having high productivity, a light-reflecting sheet obtained by containing an inorganic filler such as barium sulfate, calcium carbonate or titanium oxide in the polypropylene-based resin can be used. Patent Document 1 discloses a reflective film including a layer containing an aliphatic polyester resin, a polyolefin resin, and a fine powder filler as a light reflecting plate. In the resin composition, the content of the fine powder filler in the resin composition is more than 〇Λ% by mass and less than 5% by mass. Further, in Patent Document 2, it is disclosed that titanium oxide is used as the fine powder 4 201238756 41440pif-like filler, and the surface of the titanium oxide is coated with a coating containing oxygen, dioxane and oxidized inorganic oxide. This non-destructive miscellaneous: improves the light fastness of the film by the reflective properties obtained by titanium. 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 It is expected that a further improvement in light reflection performance is also expected for the light reflecting plate. It is extremely difficult to finely disperse titanium oxide having a coating layer containing an inert inorganic oxide on a surface used in the light reflecting plate of Patent Document 2 for fine dispersion in a light reflecting plate. Therefore, there is a problem that sufficient light reflection performance is not obtained. In view of the above, an object of the present invention is to provide a light reflecting plate having excellent light reflection performance, a resin composition for forming a light reflecting plate, and a method for producing a light reflecting plate. The light reflecting plate of the present invention is characterized by comprising: 1 part by weight of a polyolefin resin; and 20 parts by weight to 120 parts by weight of a coated titanium oxide, which is composed of an aluminum oxide and a cerium oxide. The coating layer is formed by coating the surface of titanium oxide and has a water content of 0.5 wt% or less. Further, the resin composition for forming a light reflection plate of the present invention is characterized by comprising: 1 part by weight of a polyolefin resin; and 20 parts by weight to 120 parts by weight of the coated titanium oxide, which is made of aluminum oxide and lanthanum. The coating of the oxide 201238756 is formed by coating the surface of the titanium oxide, and the water content is Q5 _ or less. Further, the method for producing a light-reflecting sheet of the present invention is characterized in that it includes a step of supplying the following light-reflecting sheet (10)-aged product to an extruder, melt-kneading, and extruding from the extruder, the light. The resin composition for a reflective plate shape comprises: 1 part by weight of a polyolefin resin; and 20 parts by weight to 120 parts by weight of titanium oxide coated with titanium oxide, which is a surface coated with titanium oxide using a coating containing oxidized cerium oxide And formed, and the water wt% or less. [Effects of the Invention] Regarding the coated titanium oxide having a water content of 0.5 wt% or less, the titanium oxide contained in the coated titanium oxide has very little water, and the aggregation of the coated titanium oxide is obtained by & excellent dispersibility. In addition, when the resin composition for forming a light-reflecting sheet is melt-kneaded by the production of a light-reflecting sheet by (4) molding or the like, the coating titanium oxide having a water content of 0.5 wt% or less can suppress the progress of the coating. The water contained in the coated titanium oxide in the melt-kneaded resin composition vaporizes to form bubbles, thereby suppressing the decrease in dispersibility of the coated titanium oxide caused by the formation of bubbles. Therefore, by using the coated titanium oxide having a water content of 5% by weight or less, it is possible to provide a light reflecting plate in which bubbles are formed to sufficiently suppress J and finely dispersed with the coated titanium oxide. Excellent light reflection performance is exhibited uniformly. In addition, when the light reflection plate of the present invention in which the formation of the bubbles is sufficiently suppressed is supplied to the secondary step having a heating step such as thermoforming, it is also possible to suppress the inclusion of the light reflection plate due to the heating of the light reflection plate. The bubble 6 201238756 41440pif expands and irregularly forms a large convex portion on the surface of the light reflecting plate. Therefore, the light reflecting plate of the present invention can maintain the excellent surface morphology before the second step even after the secondary step having the heating step, and can suppress the light reflecting plate due to the formation of the convex portion. A case where the light reflection performance is degraded or uneven. [Embodiment] The light reflecting plate of the present invention comprises: a polyolefin resin; and a coated titanium oxide which is formed by coating a surface of titanium oxide with a coating containing aluminum oxide and cerium oxide, and having a water content of 〇 · 5 wt% or less. In such a light reflecting plate, the coated titanium oxide is dispersed and contained in the polyolefin resin. As a result of various studies in view of the cohesiveness of the coated titanium oxide, the present inventors have found that the cerium oxide and the aluminum emulsifier contained in the coating layer of the coated titanium oxide are easily reacted with water to form a hydrate. Therefore, the coated titanium oxide contains a relatively large amount of moisture. With respect to the coated titanium oxide containing a large amount of water as described above, the coagulation force of the coated titanium oxides is increased to cause aggregation, and it is extremely difficult to cause fine dispersion in the light reflection plate. In addition, when the resin composition for forming a light reflection plate containing a coating titanium oxide containing a large amount of water is melt-kneaded and subjected to extrusion molding in order to produce a light reflection plate, there is moisture contained in the coated titanium oxide. The resin composition is vaporized by heating, and bubbles are generated in the resin composition which is being melt-kneaded. When the foaming occurs in the resin composition which is being melt-kneaded, the coating titanium oxide present in the far resin composition moves toward other portions in the resin composition due to the presence of bubbles, and as a result, the coating is oxidized. Titanium condensation. In addition, when the resin composition in the resin composition is diffused to the outside when the resin composition 201238756 is being kneaded and melted, a large pit is formed on the surface of the obtained light reflection plate (crater). The reason for the shape of the recess. Such a pit-shaped recess is a cause of a decrease or unevenness in light reflection performance of the light reflecting plate. Further, when bubbles are generated in the resin composition which is being melt-kneaded, the light reflecting plate obtained by using the same also contains bubbles. Since the air bubbles contained in the light reflecting plate have low light reflectivity, the light incident on the light reflecting plate is transmitted through the light reflecting plate and is led out from the back surface of the light reflecting plate. Therefore, the light reflecting plate containing the bubbles not only fails to obtain excellent light reflecting performance, but also the reflectance of light in the surface direction of the light reflecting plate becomes uneven. Therefore, since the coating titanium oxide having a water content of 5% by weight or less is extremely small in the amount of water contained therein, it is excellent not only in dispersibility but also in the resin which is being melt-kneaded at the time of extrusion molding. In the composition, bubbles generated by vaporization of water contained in the coated titanium oxide are formed, and excellent dispersibility of the coated titanium oxide can be maintained even in the resin composition. Further, it is suppressed by the formation of bubbles, and it is also possible to suppress the formation of large pit-shaped recesses on the surface of the light reflecting plate. Therefore, 'the light-reflecting plate coated titanium oxide containing the coated titanium oxide having a water content of 0.5 wt% or less is hardly agglomerated and finely dispersed in the light reflecting plate' and can suppress the formation of bubbles in the light reflecting plate, and can be used for light. Excellent light reflection performance is uniformly exhibited on the entire surface of the reflecting plate. The water content of the coated titanium oxide contained in the light reflecting plate of the present invention is limited to 0.5 wt% or less with respect to the total amount of the coated titanium oxide, but preferably 0.01 wt% to 0.5 wt%. For 〇.〇1 wt%~0.45 wt0/〇. 8 201238756 41440pif Further, the measurement of the water content of the coated titanium oxide contained in the light reflecting plate can be carried out as follows. The components other than the coated titanium oxide such as the polyfluorene-based resin, the antioxidant, the ultraviolet absorber, and the light stabilizer used in the light-reflecting sheet are not water-absorbent and cannot contain water, and only the coating layer contained in the light-reflecting sheet is oxidized. The coating of titanium may contain water. Therefore, the water contained in the light reflecting plate can be regarded as being entirely contained in the coating layer of the coated titanium oxide. In addition, since the coating layer contained in the light reflecting plate is dispersed in the polyolefin resin, the surface of the coating titanium oxide contained in the light reflecting plate is hardly exposed without being coated with the polyolefin resin. In the case, the surface of the coated titanium oxide is coated with a non-absorbent polyolefin resin. Therefore, even if the light reflecting plate is placed for a long period of time, the moisture content of the coated titanium oxide remains substantially unchanged and remains fixed. According to the above, in the present invention, a test piece having a weight of 5 § is first formed by cutting a light reflection plate into a predetermined size, and the moisture content of the test piece is measured according to the following procedure (Wl [g ]), the moisture content of the test piece was regarded as the moisture content of the coated titanium oxide in the test piece. Then, the weight (w2 [g]) of the coated titanium oxide contained in the δ-type test piece was measured according to the following procedure, and the value calculated by the formula: l_Wl / (Wl + W2) was used as the L in the test piece. The moisture content of the coated titanium oxide of 3 [^1%]. Further, at least a test piece was prepared from the light-reflecting sheet. The moisture content of the coated titanium oxide was measured for each test piece, and the arithmetic mean value was used as the content of the coated titanium oxide contained in the light-reflecting plate. The moisture content of the test piece is measured by placing the test piece in an environment of a temperature of 25t and a relative humidity of 3〇% for an hour, and then under the condition of the escape, the moisture gasification device makes the test 4 towel. The contained moisture gas 201238756 was measured and then the vaporized moisture content [g] was measured by a Karl Fischer apparatus according to the moisture measurement method of the chemical described in JIS Κ0068. Device: Moisture gasification unit (Kyoto Electronics Industry Co., Ltd. manufactures ADP-511)

MKC-510N manufactured by Kyoto Electronics Industry Co., Ltd. Gasification temperature: 230 °C Carrier gas: N2 200 ml/min Moisture measurement time: 30 minutes Additional weight of coated titanium oxide contained in the test piece The test was carried out by using an electric furnace (for example, a muffle furnace STR-15K manufactured by Isuzu Co., Ltd.), and ashing the test piece at 55 (TC for 1 hour to ash it). For the ash, the weight [g] of the ash is measured by a meter (for example, A&D Co., Ltd., manufactured by A&D Co., Ltd.), and the obtained value is regarded as a coating included in the test piece. The weight of the layer of titanium oxide is preferably 〇.1〇μιη~〇35 μπι, more preferably 0.15 μπι~0.35 μηι ', especially preferably 1515 μπι~0.30 μιη, optimal By using the coated titanium oxide having an average particle diameter within the above range, it is possible to provide a light reflecting plate which can exhibit excellent light reflection performance uniformly in the surface direction of the light reflecting plate. Grain control is within the above range The prior coated titanium oxide is very fine, so it is likely to cause agglomeration to form coarse aggregated particles. However, in the present invention, by using a coated titanium oxide having a small water content, the aggregation of the coated titanium oxide can be sufficiently suppressed. The coated titanium oxide is finely dispersed in the light reflecting plate. 201238756 41440pif Specifically, the particle diameter in the radiation plate in the cross section along the thickness direction of the light reflecting plate is 0.10 μm to 0.39 μηι and the unagglomerated coating oxygen The number is set to 150/900 μηι2~55〇/9〇〇帅2^200/900 μιη2~5〇〇/_μιη2. ” can be forked into the coating titanium oxide contained in the light reflector The average particle diameter of the coated titanium oxide of the unagglomerated coated titanium oxide can be measured as follows, for example, in the thickness direction of the reflecting plate, that is, the surface of the surface is slightly longer than the surface.显 ti t t t t t t t t t t t t t t t t t Thereby, the average particle diameter of the coated titanium oxide can be calculated. In the present invention, the diameter of the perfect circle of the minimum diameter of the coating of the coated oxide by the coated oxide is 曰 In addition, the particle size contained in the light reflecting plate is 01 = poly coating. The number of measurements can be two = 仃. First, for example, along the thickness direction of the light reflecting plate, that is, with the surface plate. Secondly, the scanning electron microscopic section is used, and the thickness of the SE light reflecting plate is m. In the cross section of the selected light reflection plate in the photograph, the coating is contained in a square shape of 30 μ: η. The oxidation of each coating is used, using Yan Jin: II: 11 201238756. Diameter: Observed by this The particle size in the grain of the coated titanium oxide was determined to be Z Γ Γ 层 层 Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z The section of the section is selected in a non-repeating manner, and the measurement of each of the two measurements is performed in the same manner as the above-mentioned measurement of the coating layer ===:=all and = the particle diameter contained in the light reflecting plate is. .: The number of coated titanium oxide (two / 900 μπι2). A coating having 18 oxide cut oxides was formed by coating a surface of 2 = 2. Titanium oxide is a chemical formula of TM2, but has a rutile type, a sharp-mined type, a chalcopyrite type, and a rutile type titanium oxide is preferred because of its excellent properties. 4 Titanium oxide is also used as a catalyst for strong redox power and is coated with titanium oxide t containing Α4 moisture. The above water is radically converted into h by the strong reducing power of oxygen reduction. ^ OH free radicals). 〇11 radicals have a very strong oxidizing power. When using a light reflecting plate at the time of J, it is possible to cause the coating to oxidize around the olefin, and the existing polyolefin resin oxidatively decomposes or causes other additives such as various antioxidants. The coloring caused by the deterioration. If the polyolefin resin present around the coated titanium oxide is oxidatively decomposed, there is a possibility that a gap is formed between the coated titanium oxide surface (10) and the TiO 2 layer is detached from the surface of the light reflecting plate. On the surface of the light reflecting plate, a 201238756 41440pif pit-like recess is generated, or the light reflection performance is lowered. In addition, coloring caused by deterioration of other additives also causes a decrease in light reflection performance of the light reflecting plate. In particular, when the light reflecting plate is used in a liquid crystal display device such as a liquid crystal television, the temperature inside the device is 4 (TC to 60 〇c and becomes south temperature), so that the oxidative decomposition of the above polyolefin resin may be promoted. Or discoloration of other additives. However, the coated titanium oxide having a water content of 0.5 wt% or less used in the present invention can sufficiently suppress the oxidative decomposition or the like of the above polyolefin resin because the amount of water contained therein is extremely small. The discoloration of the additive. Therefore, the light-reflecting sheet of the present invention containing the coated titanium oxide having a water content of 0.5 wt% or less can maintain excellent light reflection performance even when used for a long period of time in a high-temperature environment. The surface coating m of the coating layer containing the aluminum oxide and the cerium oxide is directly connected to the hydrocarbon, and the polyolefin resin caused by the photocatalytic action of the titanium oxide is suppressed. The coated titanium oxide substantially prevents the entry of ultraviolet rays into the titanium oxide by the coating thereof, and can be used to prevent discoloration due to photochemical defects in the crystallization of the rolled titanium. It is dark gray, and the light reflecting plate is used for the color change accompanying the discoloration of the titanium oxide, and the light reflecting plate has a disproportionate performance performance in the use of the private towel.

Wt%, especially good for i wt% ~ 4 wt%. More preferably, it is 1 wt/o~5 13 201238756 4ΐ4^υριι In other words, in the above-mentioned coated titanium oxide, when the total weight of the titanium oxide in the coating oxidation is set to 10% by weight, by the camp 乂The amount of radiant analysis to quantify _ oxide Α1Α is difficult to be i wt% 〜6 Wt%, more preferably 1 wt% 〜5 wt%, particularly preferably 丨wt% 〜4 wt%. When the amount of the aluminum oxide in the coating layer of the coated titanium oxide is too small, there is a possibility that the suppression of the photocatalytic action of the titanium oxide is insufficient, and the coloring caused by the deterioration of the polyolefin resin is caused. The guided light reflection performance can be degraded. Further, if the coating == oxide is excessively placed, there is a possibility that the coating absorbs visible light, and the light reflection by the titanium oxide is reduced, and as a result, the light reflectance of the light reflecting plate is lowered. Further, in the above-mentioned coated titanium oxide, the amount of the cerium oxide quantified by the fluorescent X-ray analysis into Si 〇 2 is preferably 01 wt% with respect to the total weight of the titanium oxide in the coated titanium oxide. ~7 wt%, more preferably 〇" wt% ~ 6 wt ° / 〇, especially good 〇.1 wt% ~ 5 wt%. In other words, in the above-mentioned coated titanium oxide, when the total weight of the titanium oxide in the coated titanium oxide is set to 1% by weight, the weight of the shixi oxide is quantified into Si 藉 by fluorescence and ray analysis. The amount of 2 is preferably from 1 wt% to 7 wt%, more preferably from 0.1 wt% to 6 wt%, particularly preferably from wt% to 5 wt%. When the amount of the cerium oxide in the coating layer of the coated titanium oxide is too small, there is a possibility that the photocatalytic action of the titanium oxide is insufficient, and the coloring caused by the deterioration of the polyolefin-based resin is caused. The light reflection performance of the light reflecting plate can be lowered. Further, if the amount of cerium oxide is too large in the coating of the coated titanium oxide, there is a possibility that the coating absorbs visible light, and the light reflection by the titanium oxide of 201238756 41440pif is reduced, and as a result, the light of the light reflecting plate The reflection performance can be degraded. Further, in the coating of the coated titanium oxide, the amount of aluminum oxide converted to Al 2 〇 3 by fluorescence X-ray analysis, and the amount of cerium oxide quantified by fluorescent X-ray analysis The amount converted to Si〇2 was measured using a fluorescent ray analyzer. Specifically, for example, a fluorescent ray ray analyzer sold from Rigaku Corporation under the trade name "RIX-2100" can be used, and a x-ray tube (longitudinal Rh/Cr tube (3/2.4 kW)) can be used for analysis of diameter ( 1〇mm(p), slit (standard), spectroscopic crystallization (TAP (F~Mg) pet (A Bu Si) Ge (P~Cl) LiF (K~U)), detector (F-PC (F) Measured under the conditions of ~Ca) SC (Ti U )) and the measurement mode (bulk method, 1 Om-Cr, no balance component). In detail, attaching the carbon double-sided adhesive tape to carbon On the stage, the coated titanium oxide is attached to the carbon double-sided adhesive tape. The amount of the coated titanium oxide is not particularly limited, but the reference is about Gl g, preferably the coating titanium oxide is uniform. The ground is attached to the imaginary frame of 12 mm = flat square shape defined on the carbon double-sided adhesive tape, and the carbon coating is covered with titanium oxide so as not to see the carbon double-sided adhesive tape in the imaginary frame portion. Double-sided adhesive tape. Secondly, in order to prevent the coating titanium oxide from scattering, the polypropylene film can be fully covered! ^ Carbon table as a sample for x-ray measurement' and using the X-ray measurement ^ The amount of oxide in the coating of the ruthenium-coated titanium oxide under the above-mentioned loading conditions by the δ-like sample is converted into Αΐ2〇3, and the yttrium oxide is converted into the amount of Si〇2. 15 201238756 Furthermore, as a carbon stage, as long as it is formed of carbon, the diameter is 26 mm and the south is 7 mm. For example, the product name "carbon sample table" code number is used by the company. As a carbon double-sided adhesive tape, for example, a conductive slave double-sided tape (12 mm wide, 2 〇m roll) for SEM sold by the company, can be used. As a polypropylene film, for example, it can be used. The product name "Cell sheet" by Rigaku Motor Industry Co., Ltd.

A polypropylene film of 6 μm thickness sold by CatNa3377P3". Next, a method for producing the above-mentioned coated titanium oxide will be described. When the coated titanium oxide is produced, the unspun titanium oxide is dispersed in water or a water-based dielectric towel to prepare water (4). Further, the titanium oxide may be pre-pulverized by a wet pulverizer such as a vertical sand mill, a horizontal sand mill or a ball mill in accordance with the condensation degree of titanium oxide. At this time, when the pH of the aqueous slurry is changed to 9 or more, it is possible to oxidize and stably disperse in the aqueous slurry, which is preferable. Further, a knife can be added to the aqueous material. Examples of such a dispersing agent include a Wei compound such as hexahydrate, and a Wei Weiner, and a compound such as a sulphuric acid compound such as potassium or potassium. Next, a coating containing a subtractive compound and a propiate was formed on the surface of the titanium oxide. In terms of frequency, water or a water-soluble: acid salt or both of them are added to Lai (10)t. Examples of the water-soluble salt include, for example, weaving, sulfate, stone, and gasification. Further, examples of the water-soluble (tetra) salt include, for example, sodium, (iv) potassium, etc., or (4) water-repellent towel, Yangshui miscellaneous or water-soluble Shishi acid phoenix, or both, or A neutralizing agent is added while adding either a water-soluble (10) salt or a water-soluble Shihe 16 201238756 4144 〇pif salt. Examples of the formula include sulfuric acid, hydrochloric acid, and the like: an acid compound such as an acid or a formic acid 4 organic acid, or a basic compound such as an alkali or alkaline earth metal hydroxide or a succinate or an ammonium compound. Wait. The shoulder of the coating containing cerium oxide is formed on the surface of the titanium oxide, and the Japanese Patent No. _ 53_3 Lit Kai Kai 58 side No. 3 __^ is reported to Japan for the above-mentioned method. Either or both of the oxides (4) of the surface of the titanium oxide are completely removed from the aqueous titanium oxide by using a male and a via device: = The titanium oxide is washed to remove soluble salts. In the case where a water-soluble salt and a water-soluble oxalate are added to the aqueous polymer, the coating of the surface of the titanium oxide coated with the coating containing the oxide and the cerium oxide can be obtained by the above method. Layer of titanium oxide. On the other hand, in the case where only a water-soluble aluminum salt or a water-soluble arsenoic acid (tetra) is added to the aqueous slurry, the use of any of the water-soluble (tetra) or water-soluble sulphuric acid salts is used. The coated titanium oxide is made into an aqueous slurry in the same manner as described above, and then the other of the water-soluble aluminum salt or the water-soluble ceric acid salt is added to the aqueous slurry in the same manner as described above, and water-soluble is utilized. The other of the aluminum salt or the water-soluble cerium salt coats the surface of the titanium oxide, whereby a coating oxide coating the surface of the titanium oxide with a coating containing aluminum oxide and cerium oxide can be obtained. Further, it is preferable to use a hammer mill such as a hammer mill or a needle mill 17 201238756, in order to cope with the degree of aggregation of titanium oxide coated with any one of a water-soluble salt or a water-soluble salt. Shredder crusher, grinding angry collar, Xianzao and other jet mill, ball mill sugar dryer, vertical sand pure, horizontal sand machine, grinding crusher 7 crusher, etc., preferably impact crushing plate If the content of the coated titanium oxide is too small, there is a possibility that the amount of the titanium oxide of the coating is excessive in the possibility that the first reflectance of the light-reflecting plate is lowered, and the amount of the coating plate to the titanium oxide of the coating layer is different. It is expected that the light-reflective hydrocarbon resin (10) of the light reflection plate which is commensurate with the improvement of the non-radiation performance is degraded. Therefore, the weight-containing portion of the coating material is limited to 30 parts by weight to 12 minutes, more preferably 30 parts by weight = 3 parts by weight to 1200 parts by weight to 100 parts by weight. In addition to the above-mentioned coated titanium oxide, the light reflecting plate of the present invention is also a poly-based resin: there is no particular limitation. In addition, the 'transport resin can be used alone in the linear chain: two: can be cited: low-density polyethylene' Ethylene-propylene copolymer, propylene _α strain (four) ^ Xitan m-Bai, the plate is foaming In the case of a person, as a poly; for = or 曰 专利 专利 _ _ : : _ _ 中 中 中 中 冋 冋 冋 冋 冋 冋 冋 冋 冋 冋 冋 冋One report 18 201238756 41440pif Further, the ethylene-propylene copolymer and the propylene-α-futosan copolymer may be a random copolymer or a block copolymer. The content of the ethylene component in the ethylene-propylene copolymer is preferably from 0.5 wt% to 30 wt%, more preferably from 1 wt% to 1 wt%. Further, the content of the α-olefin component in the propylene-α-olefin copolymer is preferably from 0.5 wt% to 30 wt%, more preferably from 1 wt% to 1 wt%/(). Examples of the α-olefins include α-olefins having a carbon number of 4 to 10, and examples thereof include 1-butene, 1-pentene, 4-mercapto-1-pentene, hexene, and rhenium-heptene. 1-octene and the like. Among them, the polyolefin resin is preferably a polypropylene resin, and particularly preferably a homopolypropylene. The coated titanium oxide is especially finely dispersible in the polypropylene resin. Further, it is preferred to use one or more coupling agents selected from the group consisting of a titanium coupling agent and a decane coupling agent for the purpose of dispersing the dispersion of the coated titanium oxide in the polyolefin resin. The surface of the coated titanium oxide is treated with a oxalate compound or a polyol, and more preferably treated with a decane coupling agent. Examples of the calcination coupling agent include, in addition to an alkoxy group, such as a pyridyl group, an alkenyl group, an amine group, an aryl group, a %oxy group, etc., chlorine; Oxygen burning and so on. Specifically, examples of the sulphur coupling agent include n-β (aminoethyl) γ-aminopropyl decyl dimethoxy decane and n-β (aminoethyl) γ-aminopropyl methyl group. Trimethoxy decane, n-β (aminoethyl) aminopropyl methyl triethoxy decane, γ-aminopropyl triethoxy oxime, γ·aminopropyl trimethoxy oxylate , an amino decane coupling agent such as n-phenyl-γ-aminopropyltrimethoxy oxalate, dimercaptodimethoxy decane, decyl tridecyloxy 201238756 HlHHUpii 矽, ethyl tridecyloxy Decane, propyl trimethoxy decane, n-butyl trimethoxy decane, n-butyl triethoxy decane, n-butyl decyl decyl decane, n-butyl decyl diethoxy decane, Isobutyl trimethoxy decane, isobutyl triethoxy decane, isobutyl decyl dimethoxy decane, tert-butyl dimethoxy oxime, tert-butyl triethoxy fluorene An alkyl decane coupling agent such as a tert-butyl decyl decyloxy decane or a tert-butyl decyl diethoxy decane is preferably an amine sulphur coupling agent. Further, the stagnation coupler may be used singly or in combination of two or more. Examples of the cerium oxygen-sintering compound include dimercapto-polyoxane, decyl-hydrogenpolyoxygen, and alkyl-modified polyfluorene. Further, examples of the polyhydric alcohol include trihydroxydecylethane, trimethylolpropane, tripropanolethane, pentaerythritol, and pentaerythritol, and preferably trishydroxycarbonyl and trishydroxycarbonyl. Propane. Further, the stone-oxygen compound and the polyol may be used singly or in combination of two or more. Furthermore, the above coated titanium oxide is produced by E.I. Dupont de

Nemours & Co., SCM Corporation, Kerr-McGee Co., Canadean Titanium Pigments Ltd., Tioxide of Canada Ltd., Pigmentos y Productos Quimicos' SAde C.V'Tibras Titanos SA, Tioxide International Ltd., SCM Corp., Kronos Titan GmbH, NL Chemical SA/NV, Tioxide, TDF Tiofine BV, Ishihara Industry, Tayca, 堺Chemical Industries, Furukawa Machinery, Tokem Products, Titan Kogyo, Fuji Titanium Industry, Hankook Titanium, China Metals Processing companies, ISK Taiwan companies and other sales. 20 201238756 41440pif 尕元汉射板 can also contain a first-grade antioxidant a=Xidant). This grade of antioxidant is a stabilizer that captures heat or radicals and stops the free radical reaction. It is preferable that the anti-oxidation-anti-oxidation-inhibiting light reflection (IV) i-line reflectance is reduced by the effect of the above-mentioned phenol-based antioxidant, for example, 2,6-di-ice methylbenzene, and positive ten Octayl_3_(3,5,_di-t-butylidene-4,+^ diacid vinegar, tetrakis[H3,5-di-t-butyl-4-yl-phenyl)propionic acid methoxylate ^] methane, tris[N_(3,5_di-t-butyl-4-yl)-isomeric acid vinegar, butylene-1,1-bis(2-methyl-4· Hydroxy-5-t-butylphenyl), triethylene glycol bis[3-(3-★t-butylidenehydroxy-5-methylphenyl)propionate], 39 pairs {2-[3 (3-tert-butyl-4-yl-hydroxy-5-methylphenyl)propenyloxy]-anthracene 2-diethylethyl-2,4,8,10-tetraoxaspiro[5· 5] undecane or the like, these may be used alone or in combination of two or more. Further, when the content of the primary antioxidant in the light reflecting plate is small, there is a case where the light reflectance of the light reflecting plate cannot be suppressed from being lowered. On the other hand, even if the content of the primary antioxidant in the light reflecting plate is large, light is present. The effect of suppressing the decrease in the light reflectance of the reflecting plate is not changed, and the light reflectance of the light reflecting plate is lowered by the coloring of the primary antioxidant itself. Therefore, it is preferably 相对 with respect to 100 parts by weight of the polyolefin resin. 1 part by weight to 0.5 part by weight, more preferably 〇〇丨 part by weight to 3 parts by weight, particularly preferably 0.01 part by weight to 0.2 part by weight. Here, if the coated titanium oxide having a water content exceeding 〇 5 wt% is contained in the light reflecting plate, the light reflecting plate is thermoformed on the light reflecting plate.

When S 21 201238756 is heated, a strong reducing power of titanium oxide is generated, and a large amount of moisture contained in the coated titanium oxide is radically converted into H· and 〇Η·. The OH radicals thus generated attack the phenolic antioxidant contained in the light reflecting plate to form a coloring matter such as y (stilbene quinone) (brown color), and may cause a problem that the light reflecting plate is discolored into yellow or the like. However, in the present invention, 'based on the coated titanium oxide having a water content of 0.5 wt% or less, even if the light reflecting plate contains a phenol-based antioxidant, since the amount of water in the light reflecting plate is small, the light reflecting plate can be sufficiently suppressed. The color change, and almost no coloring matter is generated by the attack of OH radicals on phenolic antioxidants. Further, a secondary antioxidant may be contained in the light reflecting plate. This secondary antioxidant ion-decomposes a hydroperoxide (ROOH), which is an intermediate of auto-oxidation degradation of a polyolefin-based resin produced by heat or light, to prevent auto-oxidation. The filament height which suppresses the fall of the light of the light reflecting plate is preferably a radiation, an antioxidant or a sulfur-based antioxidant, and more preferably a phosphorus-based antioxidant. Examples of the phosphorus-based antioxidant include tris(nonylphenyl)phosphite vinegar, tris(2,4-di-t-butylphenyl)furan vinegar, and distearyl

Stearyl-3,3'-thio-dipropionic acid g, myristyl-3,3'-thio-dipropionate, diacetate, pentaerythritol tetrakis(3-laurylthio-propane 22 201238756 41440pif acid ester), etc. These may be used individually or in combination of 2 or more types. If the content of the secondary antioxidant in the light reflecting plate is too small, there is a case where the light reflectance of the light reflecting plate is not suppressed from being lowered. On the other hand, the content of the secondary antioxidant in the light reflecting plate is too large, and there is also a possibility that the effect of suppressing the decrease in the light reflectance of the light reflecting plate is not changed. Therefore, the content of the secondary antioxidant in the light-reflecting sheet is preferably from 0.01 part by weight to 5 parts by weight, more preferably from 0.1 part by weight to 0.3 parts by weight, based on 100 parts by weight of the polyolefin-based resin. Preferably, it is 1 part by weight to 2 parts by weight of the crucible: Further, an ultraviolet absorber may be contained in the light reflecting plate. As such an ultraviolet absorber, for example, 2_(2,-hydroxy-5,-methylphenyl)benzobisazole, 2-[2'-hydroxy-3',5'-bis(?, ? - dimethylbenzyl)phenylbenzotriazole, 2-(2'-hydroxy-3',5-di-t-butylphenyl)-benzotriazole, 2_(2,-hydroxy-3 ·-Secondyl _5'·methylphenyl)_5-chlorobenzotriazole, 2_(2'-hydroxy-3',5'-di-t-butylphenyl)_5-chlorobenzo Triazole, 2_(2'.hydroxy-3,5,2-dipentyl)benzotriazole, 2-(2'-hydroxy-5,-thirdoctylphenyl)benzotrisene , 2,2'-fluorenylene bis[4-(1,1,3,3-tetradecylbutyl)_6-(21^-benzotriazol-2-yl)benzine] et al. Lanthanide UV absorber, 2,4·di-diyldiphenyl ketone, 2-transalkyl-4_methoxy-diphenyl ketone, 2-carbyl-4-methoxydiphenyl ketone- 5-sulfonic acid, 2-hydroxy-4-n-octyl-diphenyl ketone, 2-hydroxy-4-n-dodecyloxy-diphenyl ketone, bis(5-benzoinyl-4-hydroxyl) _2_methoxyphenyl) anthraquinone, 2,2'-dihydroxy-4-indolyl-diphenyl ketone, 2,2,-dihydroxy-4,4,-dimethoxydiphenyl Diphenyl ketone and other ultraviolet absorption Agent, salicylic acid benzene vinegar, salicylic acid 4-tert-butyl phenyl ester, etc., salicylate-based ultraviolet absorber, ethyl-2-cyano-3,3-diphenyl-acrylate, 2- Ethylhexyl-2-cyano 23 201238756 iflHHUpif - 3,3'-diphenyl-acrylate and other cyanoacrylate UV absorbers, 2 · Ethoxy-3-second butyl-2'-B Bis-oxalic acid bisaniline (2-61; 11 ter } 4 4-3-tert-butyl-2'-ethyl-oxalic acid bisanilide), 2-ethoxy-2,-ethyl-oxalic acid bisaniline, etc. An oxalic acid anilide-based ultraviolet absorber, a benzoate-based ultraviolet absorber such as 2,4-di-tert-butylphenyl-3,5-di-t-butyl-4-hydroxybenzoate, 2 -[4,6-bis(2,4-dimercaptophenyl)-1,3,5-triazin-2-yl]-5-pyridylphenol, 2-(2,4-dihydroxyphenyl -4,6-bis(2,4-dimethylphenyl)-1,3,5-diindole, 2,4-bis(2-pyridyl-4-butoxyphenyl)-6- A triazine-based ultraviolet absorber such as (2,4-dibutoxyphenyl)-1,3-5-triazine, etc., wherein it is preferable to effectively suppress a decrease in light reflectance of the light reflecting plate. It is a benzotriazole-based ultraviolet absorber. Further, the ultraviolet absorber may be used singly or in combination of two or more. The molecular weight of the ultraviolet absorber is preferably 250 or more, more preferably 3 to 500, and particularly preferably 400 to 500. When the resin composition for forming a light-reflecting sheet is extrusion-molded to produce a light-reflecting sheet, the ultraviolet absorber having a molecular weight of less than 25 Å is easily volatilized from the surface of the extrudate of the resin composition for forming a light-reflecting sheet, and the ultraviolet ray is absorbed. The volatilization of the agent may cause defects such as uneven gloss, crack, and crack on the surface of the obtained light reflecting plate. The molded body of the light reflecting plate in which these defects are generated cannot uniformly exhibit excellent light reflection performance. Further, if the content of the ultraviolet absorber in the light reflecting plate is too small, there is a possibility that the light reflectance of the light reflecting plate cannot be suppressed from decreasing. On the other hand, even if the content of the ultraviolet absorber in the light reflecting plate is too large, there is a possibility that the effect of suppressing the decrease in the light reflectance of the light reflecting plate is not changed. 24 201238756 41440pif = because: '% by weight relative to the polyolefin resin The content of the distracting i external line deodorant is preferably from 1 part by weight to 5 parts by weight, more preferably from 0.1 part by weight to 0.3 parts by weight, particularly preferably from 0.01 part by weight to 0.2 part by weight. . Further, a hindered amine light stabilizer may be contained in the light reflecting plate. The hindered (four) and light stabilizers are not limited, and examples thereof include bis(2,2,6,6-tetradecyl-4-pyridinyl) sebacate and diterpene sebacate-2. , 2,6,6-tetradecyl-4-piperidinyl) vinegar, malonic acid bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-2-(3,5 -di-tert-butyl-4-ylhydroxybenzyl)_2-n-butyl ester, tetrakis(2,2,6,6-tetradecyl-4-piperidinyl)-:1,2,3,4- Butane-tetracarboxylate, tetrakis(1,2,2,6,6-pentamethyl-4-pyranyl)-indole, 2,3,4·butyl-tetracarboxylic acid ester, (2, 2,6,6-tetradecyl-4-pin.Definite base)-l,2,3,4-butyl-tetracarboxylic acid ester and (2,2,6,6-tetramethyl-4-12 a group of -1,2,3,4_butan-four-g-g complex, (1,2,2,6,6-pentamethyl-4-one bottom bite)-1,2, 3,4-butan-tetracarboxylic acid ester with (1,2,2,6,6-pentamethyl-4-tridecyl)-1,2,3,4-butyr-tetracarboxylic acid ester Mixture, {2,2,6,6-tetradecyl-4-0 basement-3,9-[2,4,8,l〇-tetradospiro (5.5) Η ]]diethyl} -1,2,3,4-butadiene-tetrachatty acid g and {2,2,6,6-tetradecyl-β,β,β|,β'-tetradecyl-3,9-[ Mixture of 2,4,8,10-tetraoxaspiro(5.5) eleven-sinter]diethyl}-1,2,3,4-butane-tetracarboxylate , {1,2,2,6,6-pentamethyl-4-piperidinyl-3,9-[2,4,8,10-tetraoxaspiro (丨6 plus €^8?) (5.5) undecane]diethyl}-1,2,3,4-butane-tetracarboxylate and {1,2,2,6,6-pentamethyl-β,β,β,, ,,-tetradecyl-3,9-[2,4,8,10-tetraoxaspiro(5.5)undecane]diethyl}-1,2,3,4-butane-tetracarboxylic acid a mixture of esters, poly[6-(1,1,3,3-tetramethylbutyl)imido-1,3,5-tripa-2,4-diyl], [(2,2, 6,6-tetradecyl-4-piperidine 25

201238756 HlHHUpiI base)imine]hexamethylene[(2,2,6,6-tetradecyl-4-isopiperidinyl)imide], 4_ t 口卜' burdock-2,2,6 , 6 · Sijiji-1_ faction. a mixture of ethanol and dimethyl cyanoacrylate polymer, hydrazine, hydrazine, hydrazine, ', hydrazine, _tetra{4,6• bis[butyl_(Ν_methyl_2,2,6, 6-tetraJ-piperidin-4-yl)amino]-triazin-2-yl}-4,7-diazaindene & -1,10-diamine, etc. 'These can be used alone' In addition, if the content of the hindered amine light stabilizer in the light reflecting plate is too large, there is a possibility that the light reflectance of the light reflecting plate cannot be suppressed from decreasing, and even the hindered amine in the light reflecting plate When the light stabilizer is excessively contained, there is no change in the effect of suppressing the decrease in the light reflectance of the light reflecting plate, and the light reflectance of the light reflecting plate is lowered due to the coloring of the light stabilizer itself. Here, the content of the hindered amine light stabilizer in the light reflecting plate is preferably from 0.01 part by weight to 0.5 part by weight, more preferably from 0 to 10 parts by weight, based on the parts by weight of the polyolefin resin. It is particularly preferably 0.01 parts by weight to 2 parts by weight. Here, the deterioration of the polyolefin-based resin is caused by the cutting of the polymer main chain: specifically, it is generated from heat or material. The generated radical is converted into a peroxy radical by reacting with oxygen, and hydrogen is extracted into the autonomous chain to become a hydroperoxide. Thereafter, the hydroperoxide is decomposed by heat or light. After the alkoxy radical, the polymer main chain is cleaved, and a radical is generated along with the cleavage of the polymer main chain. The reaction cycle is repeated, the high score, the main chain is stabilized, and the molecular weight is lowered, resulting in the hydrocarbon ester The deterioration of the polyolefin resin causes a yellowing of the polyolefin resin, and as a result, the light reflectance of the light reflection plate is lowered. Therefore, in the light reflection plate of the present invention, as described above, The use of 26 201238756 41440pif containing a coating of oxide and niobium oxide coating the surface of titanium oxide to prevent the contact of titanium oxide with the polyolefin resin, and further by coating Blocking the ultraviolet rays incident on the titanium oxide, thereby preventing the oxidative cleavage of the polyolefin-based resin caused by the photocatalytic action of the titanium oxide, and preventing the photochemical change caused by the crystallization of the titanium oxide In the light reflecting plate constituting the light reflecting plate, as described above, by adding: a class of antioxidant, a secondary antioxidant, a UV absorber, and a hindered amine system, The stabilizer 'suppresses the yellowing of the polyolefin-based resin accompanying deterioration or the photochemical change of the coated titanium oxide to further prevent a decrease in the light reflectance of the light-reflecting sheet. The fineness is 'by adding an ultraviolet absorber and being blocked The amine-based light stabilizer '_ utilizes the effect of the neonization of the hydrocarbon-based resin to more effectively prevent yellowing accompanying deterioration of the polyolefin-based resin, and to prevent oxidation of the polyolefin-based resin caused by activation of the oxidized resin On the other hand, as described above, the ultraviolet absorber and the hindered amine light stabilizer have the ability to suppress the oxidative decomposition of the polyolefin resin which is caused by the titanium oxide. The inhibitory force is not sufficient, and there is a possibility that the ultraviolet absorber and the hindered (four) light stabilizer itself are oxidatively decomposed by titanium oxide. Therefore, in addition to the UV absorber and the hindered amine light stabilizer, a class of antioxidants and secondary antioxidants are added, and the capture of the radical reaction and the ionic decomposition of the peroxide are more effective. Resin 27

201238756 4144UplI Light stabilization to prevent yellowing accompanying deterioration, and more reliably prevent oxidation decomposition of the ultraviolet absorber and the hindered amine light stabilizer caused by titanium oxide. That is, in addition to preventing yellowing caused by deterioration of the fine-smoke resin by the primary antioxidant and the secondary antioxidant, the ultraviolet absorber and the hindered amine-based light stabilizer caused by the titanium oxide are more reliably prevented. Decomposition, and by the protected ultraviolet absorber and the hindered amine light stabilizer, the oxidative decomposition of the polyolefin resin caused by titanium oxide and the photochemical change are more reliably prevented, thereby making it possible to more reliably It prevents the initial light reflectance from falling in a short period of time, and maintains excellent light reflectance even after a long period of time. Further, the light reflecting plate may also contain a copper-resistant agent (metal deactivator). By adding a copper-resistant agent to the light reflecting plate, even when the light reflecting plate is brought into contact with a metal such as copper or a heavy metal ion such as copper ions acts on the light reflecting plate, a deterioration promoting factor, that is, copper ions or the like can be used. When a light reflection plate is incorporated in various liquid crystal display devices, illumination devices, and the like, the light reflection plate can be prevented from being deteriorated and yellowed by contact with a metal such as copper. . Examples of the above-mentioned copper-resistant agent (metal deactivator) include N,N-bis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propyl fluorenyl] hydrazine (hydrazi). A compound, 3-(3,5-di-tetra-butyl-4-hydroxyphenyl)propanyl difluorene or the like. Further, if the content of the copper-resistant agent (metal deactivator) in the light reflecting plate is too small, the effect of adding the copper-resistant agent may not be exhibited. On the other hand, if the content of the copper-resistant agent (gold 28 201238756 41440pif is a deactivator) in the light reflecting plate is too large, there is a possibility that the light reflectance of the light reflecting plate is lowered. Therefore, the content of the copper-resistant agent (metal deactivator) in the light-reflecting sheet is preferably from 0.1 part by weight to 1.0 part by weight based on 1 part by weight of the polyolefin resin. Further, an antistatic agent may be added to the light reflecting plate. By adding an antistatic agent, the charging of the light reflecting plate can be prevented, and dust or dust can be prevented from adhering to the light reflecting plate, and the light reflectance of the light reflecting plate can be prevented from being lowered. As such an antistatic agent, for example, an ionic polymer such as polyethylene oxide, polyglycidyl alcohol, polyethylene glycol, poly-coamine, poly-p-amine, ethylene=copolymer, and polyethylene glycol can be cited. Alcohol methyl methacrylate salt, the structure described in Japanese Patent Laid-Open No. -278985, which is alternately bonded with the hydrophilic traits, is two: material: t molecular type antistatic agent, inorganic salt, polyol, gold Static electricity = the case of an anti-static agent other than the high-type antistatic agent. j There is an antistatic effect other than the effect of adding an antistatic agent; the effect of removing the polymer type antistatic agent in the two injection plates, and the effect of the antistatic agent can be seen. The content of the antistatic agent other than the electrostatic agent is more than 0.1% by weight, and the content of the antistatic agent other than the electrostatic agent is less than the weight of the yellowing plate caused by the light and the yellowing plate caused by the light. Good for 2 straight! Share. Further, for the same reason as described above, the content of the polymer type antistatic agent in the light reflecting plate is preferably 5 parts by weight to 5 parts by weight based on 100 parts by weight of the polyolefin resin. Further, in the light reflecting plate, in addition to a copper damage inhibitor (metal deactivator) or an antistatic agent, a dispersing agent such as a stearic acid metal soap, a quenching agent, a lactone-based processing stabilizer, and a fluorescing agent may be added. Optical brightener, crystal nucleating agent, and the like. When the thickness of the light reflecting plate is too thin, in addition to the possibility that the rigidity of the light reflecting plate is lowered and the light reflecting plate is bent, there is a possibility that thinning is likely to occur when the light reflecting plate is thermoformed and formed into an arbitrary shape. The possibility of the ministry. Further, if the thickness of the light reflecting plate is too thick, the thickness or weight of the device incorporated in the light reflecting plate may increase. Therefore, the thickness of the light reflecting plate is preferably from 0.1 mm to 1.5 mm, more preferably from 1 mm to 〇 8 mm, and particularly preferably from 0.1 mm to 0.6 mm. Further, the shape of the light reflecting plate is not particularly limited, but is preferably a sheet shape. Next, a method of manufacturing the light reflection plate of the present invention will be described. In the production of the light-reflecting sheet of the present invention, the resin composition for forming a light-reflecting sheet is used, and the resin composition for forming a light-reflecting sheet contains 100 parts by weight of a polyolefin-based resin; The portion is formed by coating a surface of titanium oxide with a coating containing aluminum oxide and cerium oxide, and has a water content of 〇5 wt% or less. The water content of the coated titanium oxide can be made 〇5 wt% or less by heating the coated titanium oxide used for the production of the light reflecting plate to make the hydration water contained in the coated titanium oxide (hydration) Water) evaporation. It is preferable to apply a coating oxidation of a water content of 201238756 41440 pif to 0.5 Wt% or less by heating and drying in advance as described above for the production of a light reflection plate. In order to remove or reduce the combined water contained in the coated titanium oxide, it is preferred to heat the coated titanium oxide by preferably at 5 ° C to 14 CTC, more preferably 90 ° C to 120 ° C. The combined water is evaporated to remove or reduce the combined water. The heating time is preferably from 2 hours to 8 hours, more preferably from 3 hours to 5 hours. The resin composition for forming a light-reflecting sheet is preferably a coating titanium oxide containing a polyolefin tree and a moisture content of 0.5% by weight or less, and optionally containing a primary antioxidant, a secondary antioxidant, Other additives such as UV absorbers and hindered f-based light stabilizers. Further, other additives such as a polyolefin resin, a coating titanium oxide, a primary oxidizing agent, a secondary antioxidant, a UV absorber, and a hindered amine light stabilizer used in the resin composition for forming a light reflecting plate are used. The description is as described above. Further, it is preferable that the resin composition for forming a light reflecting plate is prepared by preliminarily preparing a mother particle containing a polyolefin resin and a coated titanium oxide, and comprises the above-mentioned mother particles, a polyolefin resin, and, if necessary, a primary antioxidant, secondary Other additives such as antioxidants, UV absorbers, and hindered amine light stabilizers. Thus, by using the mother particles containing the coated titanium telluride, the dispersibility of the coated titanium oxide in the resin composition for forming a light reflecting plate can be improved. Further, the coated titanium oxide having a mother particle moisture content of 0.5% by weight or less is completely coated with a polyolefin resin, and the coated titanium oxide which is not covered by the material is exposed. Therefore, even if the master batch is placed for a long period of time, the moisture content of the coated titanium oxide contained in the master batch changes and the lining is fixed. The production of the mother particles is not particularly limited, but it is preferably carried out by the following method: the coated titanium oxide and the polyolefin resin are supplied to a predetermined weight ratio 31 201238756 mi ▲ After obtaining the melt-kneaded product, the mixture was extruded using & Further, it is preferable to prepare the master batch by using a coating titanium oxide having a water content of 〇 5 w under the above-described conditions in which the mother particles are used as described above. When the ship-melting mixture is obtained by refining the coated cerium oxide and the polyolefin-based resin in an extruder, it is preferred to use an extruder having a volatile composition of two structures, which will be self-refining during the melting practice. The volatile components produced in the melt-mixed material are discharged to the outside of the extruder. By this method, the combined water contained in the coating layer of the coated titanium oxide can be removed more satisfactorily. As the extruder having a volatile component removing mechanism, for example, a vented extruder or the like can be preferably used, and the vented extruder is melted and melted on the coated titanium oxide and the polysulfide shaft grease. The cylinder compartment of the machine is provided with a vent for discharging the gas inside the cylinder to the outside. According to the vented extruder, the vacuum can suck the gas inside the cylinder from the vent σ and discharge it to the outside. When the gas is sucked from the vent, it is preferable to set the pressure in the cylinder to 7.5 mmHg to 225 mmHg (1 kPa to 3 kPa), and more preferably to 22 5 _Hg to 150 mmHg (3 kPa to 20 kPa). ). By the pressure in the cylinder being within the above range, even in the case of melt-kneading, the combined water contained in the titanium oxide coating contained in the melt-kneaded product can be removed. Further, the temperature of the melt kneaded material at the time of melt-kneading is preferably ΐ8〇^ to 290 °C, more preferably 18 CTC to 270 °C. — The resin composition for forming a light reflecting plate is preferably obtained by using a polysulfonate resin and a water content of 0.5 wt%. The following coatings of titanium oxide, as well as the optional 32 201238756 41440pif • grade antioxidants... one...one double oxidant, UV absorption ί other additives are supplied to the extrusion financing as follows: This method is the final light obtained The reflector is formed in such a manner as to be used for each component. # When using the masterbatch, the light reflecting plate is preferably made of a masterbatch containing a polyene-based resin and a coating containing water and/or dry, a polyolefin resin, and the like. - Stage Antioxidant, Secondary (10) Melt-kneading to make 'This method is a method of containing each component in a desired weight ratio in the finally obtained light reflection plate. Li Shu ^ ^ ^ Even if the resin composition for forming a light-reflecting sheet is obtained by kneading the coated titanium oxide and the poly-hydrocarbon in an extruder, the volatile component such as a vented extruder is removed. The body's extruded volatile component - right eight" is the father of Bu. By this method, the compound water contained in the coating layer of the coated titanium oxide can be removed by the knife: in the case of the master batch, the vented extruder is the same as described above. When the vent of the in-cylinder air extruder draws gas, it is better to make the gas better: set to 7.5 mmHg to 225 mmHg (1 kpa to 30 kpa), and = 22.5 mmHg to 150 mmHg (3 kPa to 2). 〇kpa). The pressure that can be used is within the above range, and even in the case of the kneading: the removal of the chemical contained in the coated titanium oxide contained in the resin composition 33 201238756 HlHHUpif combined water. Further, the temperature of the resin composition at the time of melt-kneading is preferably from 180 ° C to 290 ° C, more preferably from 180 ° C to 270. (Respectively, the resin composition for forming a light-reflecting sheet is preferably produced by melt-kneading a polyolefin-based sapphire and a coating oxidized product into a general-purpose kneading device such as an extruder, but After that, the resin composition for forming a light-reflecting sheet can be formed into a predetermined shape such as a pellet. In the resin composition for forming a light-reflecting sheet thus formed, the coating titanium oxide having a water content of 5% by weight or less is composed of The polyolefin-based resin is completely coated, and there is almost no coating titanium oxide which is not exposed by the polyolefin-based resin. Therefore, even if the formed resin composition for forming a light-reflecting sheet is placed for a long period of time, the light-reflecting sheet is formed. The water content of the coated titanium oxide contained in the resin composition is also substantially constant without being changed. When the resin composition for forming a light reflecting plate is formed into a pellet shape, for example, by coating titanium oxide and The polyolefin-based resin is supplied to an extruder and melt-kneaded to obtain a resin composition for forming a light-reflecting sheet, and the resin composition for forming a light-reflecting sheet is extruded into a strand shape from an extruder, and then it is carried out at intervals. In the case of using the master batch, the masterbatch and the polyolefin resin are supplied to an extruder and melt-kneaded to obtain a resin composition for forming a light-reflecting sheet. In the extruder, the resin composition for forming a light reflecting plate is extruded into a strand shape, and then cut at regular intervals to form a pellet. Further, the resin for forming a light reflecting plate is composed of a resin. The moisture content of the coated titanium oxide contained in the material is determined by the method for formulating the water content of the coated titanium oxide contained in the light reflecting plate, and (4) is formed by weighing the light reflecting plate 34 201238756 41440pif resin The sample obtained by 5 g of the composition was used in place of the test piece having a weight of 5 g obtained by cutting the light reflecting plate, and the measurement was performed in the same manner. Further, by forming the above-mentioned light reflecting plate When the resin composition is formed into a sheet shape, the light reflection plate of the present invention comprising the non-foamed sheet can be produced. When the resin composition for forming a light reflection plate is formed into a sheet shape, the expansion method, the T-die method, and the calendering are used. In the known method, the resin composition for forming a light-reflecting sheet can be formed into a sheet shape, and is preferably a τ-type mold method. When the resin composition for forming a light-reflecting sheet is formed into a sheet shape by the τ-die method, for example, The method is such that the τ-shaped mold is attached to the end of the extruder, and the resin composition for forming a light-reflecting sheet which is melted and kneaded in the extruder from the stencil is extruded into a sheet. When a polyolefin resin, a coated titanium oxide, or the like is supplied to an extruder and melt-kneaded in an extruder to obtain a resin composition for forming a light reflection plate, The resin composition for forming a light-reflecting sheet is directly extruded from an extruder to produce a light-reflecting sheet. When a resin composition for forming a light-reflecting sheet formed into a granular shape is used, it is possible to The formed resin composition for forming a light reflecting plate is supplied to an extruder, melt-kneaded, and then extruded from an extruder to produce a light reflecting plate. In addition, even when the resin composition for forming a light reflecting plate is melted and kneaded in an extruder and formed into a sheet shape, an extruder having a volatile component removing mechanism such as a ventilating extruder is used to reflect light. It is also preferable that the volatile component generated in the resin composition for forming a light-reflecting sheet is discharged to the outside of the extruder during melt-kneading of the resin composition for forming a sheet. Furthermore, in the case of masterbatch 35 201238756 4l44Upif The lower vented extruder is the same as above. When the gas is sucked from the vent of the vented extruder, it is preferred to set the pressure in the gas to 75 mmHg to 225 mmHg (1 kPa to 30 kPa), more preferably 22.5 mmHg to 150 mmHg ( 3 kPa to 20 kPa). When the pressure in the cylinder is within the above range, it is possible to remove the refining water and L contained in the coated titanium oxide contained in the resin composition during melt-kneading. The 'receiving degree of the resin composition for forming a light reflecting plate is preferably ～29 〇. Oh, it’s better to be 18〇. 〇~27〇. Hey. Moreover, it is preferable to obtain a sheet-like extrudate by extruding a resin composition for forming a light reflection plate from an extruder, and before the sheet-like extrudate is cooled and solidified to become a light reflection plate. The mirror side of the sheet-like extrudate is mirror-finished. According to the mirror processing, the surface smoothness of the sheet can be improved to provide a mirror processing having excellent disproportionability. For example, the following method can be preferably used to supply the extrudate to the outer peripheral surface to form a mirror surface. The mirror roller is pressed between the pair of rollers of the pair of rollers disposed opposite to each other, and the mirror surface is pressed against the surface of the 4-shaped extrudate. The layer-Lit invented the light reflecting plate on the surface of which will have a sheet-like support volume of 2 layers. As such a reading body, Kexian: bis-polyamine series: month: resin film, biaxially stretched poly, resin film, preferably enamel propylene and: Γ here, as polypropylene Resin, benzene can be condensed, and can be exemplified by poly(ethylene bromide) polyethylene terephthalate, polybutylene terephthalate 36 201238756 41440pif ester: and polylactic acid. As the polyamine-based resin, nylon, 6, Ni Ni, etc. are preferable. Further, it is also possible to form a laminated body by integrating the gold layer on one side of the reticle of the present invention. As the metal foil, an aluminum foil is preferably exemplified: Thus, by laminating the metal foil, a laminate having radioactivity can be obtained. In the case where the support or the metal foil is laminated on the light reflection plate, it is not particularly limited as long as a known method such as a lamination method, a dry lamination method, or a pressure is carried out. a further, the light reflection plate of the present invention does not require an extension step at the time of its manufacture, and has excellent thermoformability, and can be thermoformed into a shape as a method of forming a light reflection plate depending on the application, and for example, vacuum forming can be cited. j pressure forming. Examples of the vacuum forming or the pressure forming include a plug forming method and a free stretch forming method. 〆 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 。 。 。 。 。 。 。 。 。 Further, it is preferred to use a mold capable of temperature adjustment in the above molding method. The light reflecting plate of the present invention is preferably a backlight unit for a liquid crystal display device such as a word processor, a personal computer, a mobile phone, a navigation system, a television, or a portable television. As described above, the light-reflecting sheet of the present invention has excellent light-reflecting performance. Therefore, by using such a light-reflecting sheet for a backlight unit of a liquid crystal display device, it is possible to provide a liquid crystal display in which the decrease in luminance or the generation of unevenness is suppressed. Device. When the light reflecting plate of the present invention is used in the backlight unit 37 201238756, HIHHUpii of the liquid crystal display device, the light reflecting plate can be assembled into a direct light backlight, an edge light type backlight or a planar light source type constituting the liquid crystal display device. The backlight is used internally. A schematic view of an edge-lit backlight unit of a liquid crystal display device using the light reflecting plate of the present invention is shown in Fig. 1. The liquid crystal display device shown in FIG. 1 includes a light reflection plate 10, a light diffusion layer 20 which is laminated and integrated on the light reflection plate 10, and a light guide plate 3 disposed on the light diffusion layer 20, and is disposed. The illuminating light source 4 〇 on the side of the light guide plate 30 and emitting light to the light guide plate 3 , and the lamp reflector 50 for reflecting the light emitted from the illuminating light source 4 朝 toward the light guide plate 30 . Further, examples of the light-emitting source 4A include a cooling cathode or an LED. The light-diffusing layer 20 is formed by dispersing the light-transmitting particles 21 containing a styrene resin or an acrylic resin in a binder resin such as a thermoplastic resin. Further, the surface of the light-diffusing layer 20 has an uneven shape formed by the light-transmitting particles 21, and the light can be diffused by the uneven shape. Further, the light diffusion layer 20 can be formed by applying a coating material containing light-transmitting particles in the binder resin to the surface of the light reflection plate and drying it. In the liquid crystal display device, light incident on the light guide plate 30 by the illuminating light source 40 is reflected back between the front surface and the back surface of the light guide plate 30, whereby the surface of the light guide plate 30 is led out to the outside of the light guide plate 3〇. In addition, the light which is led out from the back surface of the light guide plate 30 is formed on the surface of the light diffusion layer 20 by the light-transmitting particles 21, and is diffused and reflected so that the surface side of the light guide plate 3 is uniformly distributed. Further, when the light guided from the back surface of the light guide plate 3 is transmitted through the light diffusion layer 20, the light is reflected by the light reflection plate 10 toward the surface side of the light guide plate 30. Thus, by combining the light source 38 201238756 41440pif source with the light guide plate 30, the light diffusion layer 20, and the light reflection plate 10, the brightness of the liquid crystal display device can be improved. Further, the light reflecting plate of the present invention can be preferably used for an illuminating device for advertising or viewing, in addition to being preferably used for the backlight unit of the above liquid crystal display device. Hereinafter, an example of an illumination device using the light-reflecting plate of the present invention will be described with reference to the drawings. When the light reflecting plate is used for an illuminating device for advertising or viewing, it is preferable to use the light reflecting plate in a predetermined shape before being thermally molded. Specifically, as shown in FIGS. 2 and 3, the thermoformed light reflecting plate has a plurality of inverted quadrangular pyramid-shaped recesses 12 and 12_ continuously formed in the longitudinal and lateral directions, and is formed on the inner bottom surface of the recessed portions 12, 12, . The through hole na is formed as a light source arrangement portion for arranging the light source, and the inner peripheral surface 上述 of the concave portions 12, 12, . . . is formed as a light reflection surface that reflects the light emitted from the light source. Further, a device for performing thermoforming as described above is shown in Fig. 4. As shown in FIG. 4, the illuminating device is configured by arranging an illuminating body c including a light reflecting plate H) and a light emitting diode L in a casing. The frame body 6G includes a bottom surface portion 61 having a rectangular shape that is larger than the size of the light reflection plate 1 (), and a peripheral wall portion 62 having a rectangular frame shape extending upward from the outer circumferential edge of the bottom surface portion 61. . Further, the end portion of the inner peripheral surface of the peripheral wall portion is formed with a segment portion, and the frosted glass or the optical sheet 80 is detachably disposed in the segment portion 62. The light source of C may be a general-purpose light source in addition to the light-emitting diode. Further, the "preparation light source body 70" is a light source body 7G which is provided with a plurality of light-emitting diodes L, L··· on a flat square substrate 7i having a size of 39 201238756 on the bottom surface portion 61 of the casing 60. to make. Further, in a state where the light reflecting plate 1 is superposed on the light source body 70, the through holes 13a of the respective concave portions 12 are configured to match the positions of the respective light emitting diodes L of the light source body 70. Further, the light source body 70 is laid on the bottom surface portion 61 of the casing 6〇 with the light-emitting diode L facing upward (in the opening direction of the casing 60). The light reflecting plate 1 is laid on the light source body 70. In other words, the light-emitting diode L of the light source body 7 is disposed through the through hole 13a of the concave portion 12 of the light reflecting plate 10 to constitute the illuminating body C. When the illuminating device B is used, first, the frosted glass or the optical sheet 80 is detachably disposed on the segment portion 62a of the peripheral wall portion 62 of the casing 60, and then the light-emitting diode L is caused to emit light (see Fig. 4). Then, the light is radiated radially from the light-emitting diode L, and the light incident on the inner peripheral surface of the concave portion I] of the light reflecting plate is reflected by the inner peripheral surface one or more times, and the traveling direction is directed toward the frosted glass or the optical sheet 80. Oriented into the frosted glass or optical sheet 8〇. Further, it is preferable that the light reflection plate 10 of the illuminating body C is not in close contact with the frosted glass or the optical sheet 80. Further, the optical sheet 80 contains a light diffusing agent such as titanium oxide that diffuses light therein, and light incident into the optical sheet 80 is diffused and reflected by the light diffusing agent in the optical sheet 8 or is incident on the frosted glass. The light inside is diffused and diffused by the frosted glass, and then diffused from the frosted glass or the optical sheet 8 to the outside. When the frosted glass or the optical sheet 80 is observed from the front surface, the entire surface is substantially uniformly illuminated. Here, the light incident into the frosted glass or the optical sheet 80 is diffused and reflected in the frosted glass 201238756 41440pif or the optical sheet 80, and a part of the light is reflected toward the light reflecting plate a and is incident again toward the light reflecting plate A, but The light incident on the light reflecting plate 10 again is reflected on the inner peripheral surface of the concave portion 12 and is again incident into the frosted glass or the optical sheet 80. Thus, the light emitted from the self-luminous diode L is reflected on the inner peripheral surface of the concave portion 12 while being diffused while being reflected toward the frosted glass or the optical sheet. Thus, the frosted glass or the optical sheet 80 is entirely throughout. The surface is irradiated with light with a substantially uniform beam. Therefore, there is almost no case where the position of the light-emitting diode is transmitted through the frosted glass or the optical sheet 80. Moreover, the pattern or the text directly on the frosted glass or the optical sheet 80 or the pattern or the text drawn on the decorative sheet disposed on the frosted glass or the optical sheet 80 is uniformed from the entire frosted glass or the optical sheet 80. The light radiated from the ground is in a state of being clearly and uniformly floated. Therefore, the above lighting device can be preferably used as a lighting device for advertising or viewing. In the above, the case where the light diffusion layer is formed on the surface of the light reflection plate and the light is diffused by the light diffusion layer has been described. However, one or both surfaces of the light reflection plate may be formed as an uneven surface. The uneven surface is used to diffuse light incident into the light reflecting plate. The method of forming the surface of the light reflecting plate into the uneven surface is not particularly limited. Preferably, for example, the method of the following (1) is used: a known method such as an expansion method, a T-die method, or a calendering method is used, and light reflection is used. A sheet-like extrudate is produced by a resin composition for forming a sheet, and the sheet-like extrudate is supplied between a pair of rolls* and then the unevenness formed on the surface of one of the two or two rolls is transferred to the sheet. The surface of the extrudate is formed, whereby the surface of the light reflecting plate is formed into a concavity and convexity 201238756 - ri-t-rvpii surface. According to the method (o), the surface of the sheet-like extrudate produced by extrusion from the extruder is continuously formed with irregularities, whereby the light reflecting plate having the surface formed as the uneven surface can be continuously produced in one step. When the surface roughness Ra of the uneven surface of the light reflection plate is small, the light diffusibility of the light reflection plate may be lowered. When the surface roughness Ra of the uneven surface of the light reflection plate is large, light reflected from the light reflection plate exists. The diffusibility becomes uneven, and the diffuse reflectance of the light reflected from the light reflecting plate decreases. Therefore, it is preferably 1 μm to 20 μm, more preferably 1 to 15 μm. When the average interval Sm of the unevenness is small, the light diffusibility of the light reflecting plate is lowered. When the average interval Sm of the unevenness on the uneven surface of the light reflecting plate is large, the diffusibility of the light reflected from the light reflecting plate becomes The unevenness and the diffuse reflectance of the light reflected from the light reflecting plate are lowered, so it is preferably 5 μηη to 300 μηι, more preferably ι〇μιη to 130 μιη, if the maximum height of the uneven surface of the light reflecting plate (Ry ) When the light diffusing plate is small, the light diffusibility of the light reflecting plate is lowered. If the maximum height (Ry) of the uneven surface of the light reflecting plate is large, the diffusibility of the light reflected from the light reflecting plate becomes uneven, and the self-lighting The case where the diffuse reflectance of the light-reflecting plate is decreased is therefore preferably from 5 to 80 μm, more preferably from 1 to 4 μm to 3 μm. The surface roughness Ra of the uneven surface refers to a value obtained by measuring according to the reference length of 2·5 _ and the evaluation length of 12 5 . The average interval s of the unevenness on the uneven surface of the light reflection (four) is based on JIS B 〇601, the value obtained by measuring the length of 2.5 mm and the length of 12 5 heads 42 201238756 41440pif. The unevenness of the light reflection plate _ maximum height 疋 refers to the reference length of 2 5 mm according to JIS, and the evaluation of longevity 2 The value obtained by the measurement is specifically determined by the company's product name "Double Scanning High-Precision Laser Measuring Apparatus" and "Double-Scan High-Precision Laser Measuring Machine LT Locking" from the company. And the brand name "non-contact wheel" from COMS The measuring instrument sold by the measuring system and the MAP can be used to measure the surface roughness Ra and the average interval Sm. The extension can form light and convexity on the surface of the light reflecting plate to reflect light: excellent light Diffusion. As described above, #片片的 extrudate is supplied to the I-to-roller, and the concave 1 formed on the outer peripheral surface of the two rolls is printed on the surface of the sheet-like extrudate. When at least one of the light reflecting plates is formed as an uneven surface, the unevenness formed on the outer peripheral surface can be accurately formed on the surface of the light reflecting plate, whereby the surface of the light reflecting plate can be formed. The unevenness is made into a concave-convex surface, and the light reflection plate is read/and has uniform light diffusibility. Further, when the surface of the light reflecting plate is formed into an uneven surface, the surface of the light reflecting plate is formed by pressing the unevenness such as unevenness on the outer peripheral surface of the corrugating roll against the sheet-like extruding object surface. Since the uneven surface is formed, at least one surface of the light reflecting plate can be formed into a concave surface irrespective of the thickness of the convex reflecting plate, and a light reflecting plate having a large thickness and excellent light diffusibility can be easily produced. The light reflecting plate having the same at least one surface as the uneven surface and the above-mentioned light reflecting plate j do not require an extending step at the time of manufacture, and have excellent thermoforming which can be thermoformed into a desired shape depending on the application. Further, since the forming method 43 201238756 τι-τ-rvpii.' method is the same as the above, the description thereof is omitted. Since the light reflecting plate is formed on at least one surface as an uneven surface, when the uneven surface of the light reflecting plate comes into contact with the mold during thermoforming, a gap portion is formed between the uneven surface of the light reflecting plate and the surface of the mold, and is permeable. This void portion smoothly excludes the air existing between the light reflecting plate and the opposing faces of the mold, so that the light reflecting plate can be accurately thermoformed into a desired shape. In the case where the light-reflecting plate is thermoformed in a state where the uneven surface of the light-reflecting sheet is in contact with the mold, the uneven surface of the light-reflecting sheet is pressed by the mold during the hot forming, and the unevenness of the uneven surface is slightly reduced. . That is, the surface roughness Ra of the uneven surface, the average interval Sm of the unevenness of the uneven surface, and the maximum height (Ry) of the uneven surface become small after the thermoforming of the light reflecting plate. Therefore, when the light-reflecting sheet is thermoformed in a state where the uneven surface of the light reflecting plate is in contact with the mold, it is preferable that the surface of the light-reflecting sheet after the hot forming is such that the surface of the uneven surface has a rough chain degree Ra and unevenness. The average interval Sm of the unevenness of the surface and the maximum height (Ry) of the uneven surface are adjusted so as to obtain a desired value, and the surface roughness Ra of the uneven surface and the unevenness of the uneven surface are formed in the light reflecting plate before the thermoforming. The average interval Sm and the maximum height (Ry) of the uneven surface are adjusted to be larger than the desired value after thermoforming. [Examples] Hereinafter, the present invention will be more specifically described by way of examples, but the present invention is not limited thereto. (Example 1) First, a coated titanium oxide A (trade name "CR-93" manufactured by Ishihara Sangyo Co., Ltd." was prepared to have an average particle diameter of 〇·28 μπ1). The coated titanium oxide a is coated with a coating of rutile oxide and a sulphur oxide containing 44 201238756 41440pif to coat the surface of the rutile gasification. In the coated ruthenium oxide A, the amount of the oxidized oxide was quantified by fluorescent X-ray analysis, and the result was converted to Α1ζ〇3, and the total weight of the oxidized oxime was 3.1 wt. Further, in the coated titanium oxide A, the amount of the cerium oxide was quantified by honing X-ray analysis, and as a result, it was converted into Si , to be 4.2 wt% based on the total weight of the titanium oxide. Next, the above-mentioned coated titanium oxide A was heated at 100 ° C for 5 hours and dried to reduce the amount of the combined water contained in the coated titanium oxide. Using a ventilated twin-screw extruder with a diameter of 120 mm, 53.8 parts by weight of the coated titanium oxide A, and homopolypr〇pyiene (manufactured by SunAllomer Co., Ltd.) at 2303⁄4 PL500A"'s swell flow rate: 3.3 g/l 〇 min, density: 〇9 g/cm3) 40 parts by weight was melt-kneaded and granulated to prepare a mother particle of the coated titanium oxide a. Further, when the coated titanium oxide A and the homopolypropylene are melt-kneaded in the cylinder of the ventilating twin-screw extruder, the cylinder is used to evacuate the cylinder so that the pressure in the cylinder becomes 60 mmHg (8 kPa). The gas is discharged from the vent to the outside. Then, 93.8 parts by weight of the master batch, homopolypropylene (trade name "PL5〇〇A", manufactured by SunA11〇mer Co., Ltd., melt flow rate: 33 g/1〇mm' density: 〇.9g/cm3) 6〇重量份份, i-type antioxidant (b read the company's product gIRGANOX (registered trademark) 1〇1〇) 〇 15 parts by weight, phosphorus: antioxidant (BASF company's trade name IRGaf〇si68) 0·15 parts by weight, benzene Triazole-based UV absorber 丨 (molecular weight: 3丨58, manufactured by BASF Corporation, UVIN (registered trademark) 326) 45 201238756^ HiHHVpil Heavy-duty, and hindered amine-based light stabilizer (trade name TINUVIN manufactured by BASF Corporation) (registered trademark) (1)) 15 parts by weight of the crucible was supplied to a ventilated single-screw extruder having a caliber of mm mm at 22 Torr. Melt kneading is carried out under the arm, thereby obtaining a heterogeneous ligament, which is self-mounted from a T-shaped mold (sheet width: 1000 mm, slit spacing: 〇. 2 mm, temperature 200 C) attached to the front end of the extruder. The resin composition for forming a reflecting plate is extruded into a sheet shape to obtain an extrudate of the shape of >. Then, the sheet-like extrudate is supplied between a pair of rolls including a mirror surface having a mirror surface on the outer peripheral surface and a support roller which is fitted to the mirror surface, and the mirror roll is pressed against the sheet-like extrudate. On the surface, a non-foamed light reflecting plate having a face treated by a mirror surface treatment and having a thickness of 〇2 mm and a density of 1.3 g/cm3 was obtained. Further, when the resin composition is melt-mixed in the cylinder of the ventilating single-axis extruder, the gas in the cylinder is directed from the ventilating port by a vacuum pump so that the pressure in the cylinder becomes 6 〇 mmHg (8 kPa). External discharge. (Example 2) Light was produced in the same manner as in Example 1 except that the coated titanium oxide B (trade name: CR 90 manufactured by Ishihara Sangyo Co., Ltd., average particle size control: 25 μm) was used instead of the coated titanium oxide a. Reflective plate.

Further, the coated titanium oxide B is a surface coated with rutile-type titanium oxide using a coating containing a secret oxide and a (tetra) compound. In the coated titanium oxide B: two:, the amount of aluminum oxide was quantified by fluorescent X-ray analysis, and as a result, after changing to Al2〇3, the total weight relative to titanium dioxide was 2 7 _. On the other hand, in the second titanium coating, the weight of the titanium oxide B was reduced by 3.6 wt% with respect to the total amount of 46 201238756 41440 pif of the dioxins. (Example 3) A coating titanium oxide C (trade name "CR-80" manufactured by Ishihara Sangyo Co., Ltd.' average particle diameter: 0.25 μm) was used instead of the coated titanium oxide A, except that the same manner as in Example 1 was carried out. Light reflector. Further, 'coated cerium oxide C is a surface coated with rutile-type titanium oxide by using a coating containing aluminum oxide and cerium oxide. The amount of the aluminum oxide was quantified by the fluorescent X-ray analysis in the coated titanium oxide C. The conversion to Al2?3 was 3.3 wt% based on the total weight of the titanium oxide. Further, in the coated titanium oxide C, the amount of the cerium oxide was quantified by fluorescent X-ray analysis, and as a result, it was converted into Si 〇 2 and was 1.8 wt% based on the total weight of the titanium oxide. (Example 4) In the same manner as in Example 1, except that the coated titanium oxide D (trade name "CR-63" manufactured by Ishihara Sangyo Co., Ltd., average particle diameter: 〇21 μm) was used instead of the coated titanium oxide A. A light reflecting plate is manufactured. Furthermore, 'coated yttrium oxide D is made of aluminum oxide and lanthanum oxide.

The coating coats the surface of the rutile titanium oxide. In the coated titanium oxide D, the amount of aluminum oxide was quantified by honing X-ray analysis, and the result was converted into α 〖2 〇 3, and the total weight of titanium dioxide was i 4 wt% e. In the titanium ruthenium, the amount of ruthenium oxide was analyzed by fluorescence ray ray analysis, and as a result, it was converted to Sic > 2, and the total weight of the bismuth oxide was 0.7 wt%. (Example 5) 201238756 The coating titanium oxide E (trade name "CR-50" manufactured by Ishihara Sangyo Co., Ltd. 'average particle size control 〇·25 μιη) was used instead of the coated titanium oxide A, except that it was the same as in Example 1. The way to make light reflectors. Further, the coated titanium oxide E is a surface coated with rutile-type titanium oxide by using a coating containing aluminum oxide and cerium oxide. In the coated titanium oxide E, the amount of aluminum oxide was quantified by fluorescent X-ray analysis, and as a result, it was 2.3 wt% based on the total weight of the titanium oxide after conversion to Ab〇3. Further, in the coated titanium oxide E, the amount of the cerium oxide was quantified by fluorescent X-ray analysis, and as a result, it was 0.1 wt% based on the total weight of the titanium oxide. (Examples 6 to 10) The types of coated titanium oxide were changed as shown in Table 1, and a benzotriazole-based ultraviolet absorber 2 (molecular weight: 447.6, manufactured by BASF Corporation, TINUVIN (s). A light reflecting plate was produced in the same manner as in Example 1 except that benzotriazole α-based ultraviolet absorbing agent 1 was used instead. (Example 11 and Example I·2) The amount of the coating oxide was changed as shown in Table 1, and a stupid triazole-based ultraviolet absorber 2 (molecular weight: 447 6, manufactured by BaSF, TINUVIN (registered trademark) was used. 234) A light-reflecting plate was used in the same manner as in Example 1 except that the benzotriazole-based ultraviolet absorber 1 was used. & (Comparative Example 1 to Comparative Example 4) The type of the coated titanium oxide was changed as shown in Table 1, and the same manner as in Example 1 was carried out except that the coating of the coating of the titanium oxide was not carried out. Example 5 and Comparative Example 6) The amount of oxygen reduction in the coating was changed as shown in Table 1, and the heating of the layer was not carried out, and the three-shirt and the three-shirt and the wire suction knife 1 were 447.6, manufactured by BASF. A light reflection plate was produced in the same manner as in Example 1 except that the product name TINUVIN (the ancient main = mark = 4) was used instead of the benzotriazine ultraviolet absorber i. (Example 13) First, a coated titanium oxide A (Ishihara Industry 2, 'average particle diameter: 0.28 Å) was prepared. The coating was coated with a coating of the oxide and the weide to coat the ::::^ amount. The result was converted to Al2〇3 and reset to 3.1 wt% with respect to the titanium dioxide. Further, the amount of the weide was quantified by cadaveric spectroscopy in the coating oxidation, and the result was converted to 2 2 wt% with respect to the total weight of the titanium dioxide. Next, the above-mentioned coating yttrium oxide A was heated to 5 to dry at 10 (TC), thereby reducing the amount of combined water contained in the coated titanium oxide. The ventilated double-saw machine with = mm was used for the reduction under the boot.

Is λ Γ layer of titanium oxide A not more than 8 parts by weight, and homopolymerized polypropylene, the trade name "PL5 〇〇 A", melt flow velocity, density. G 9 g / (10) 3) 4G parts by weight, melt and refine Granulation to produce a masterbatch of coated titanium oxide A. Furthermore, when 49 201238756 ΗΙΗΗυρίί is used in the gas red of a ventilated twin-screw extruder to smelt and knead the coated titanium oxide bismuth and homopolypropylene, the pressure in the cylinder becomes 6 〇 mmHg (8 kPa). The method uses a vacuum pump to discharge the gas in the cylinder from the vent to the outside. Then, 93.8 parts by weight of the master batch, homopolypropylene (trade name "PL500A", manufactured by SunAU Co., Ltd., melt flow rate: 3.3 g/10 min, density: 0.9 g/cm3), 60 parts by weight, phenolic antioxidant (product name: IRGANOX (registered trademark) 1010) manufactured by BASF Corporation. 15 parts by weight, phosphorus-based antioxidant (trade name: IRGAFOS168, manufactured by BASF Corporation) 0.15 parts by weight, benzotriazole-based ultraviolet absorber ι (molecular weight: 315,8) 0.15 parts by weight and a hindered amine light stabilizer (manufactured by BASF Corporation, TINUVIN (registered trademark) 111), 0.15 parts by weight, supplied to a ventilated single sheet having a diameter of 12 〇mm. The resin composition for forming a light reflection plate was obtained by melt-kneading at 220 ° C in a shaft extruder. The resin composition was extruded into a strand shape from a nozzle mold attached to the front end of the ventilating single-screw extruder, and the strand was cut every 2.5 mm to form a cylindrical shape having a diameter of 2.5 mm. This obtained a resin composition for forming a granulated light reflecting plate. When the resin composition for forming a light reflecting plate is melt-kneaded in the cylinder of the ventilating single-axis extruder, the gas in the cylinder is used by a vacuum pump so that the pressure in the cylinder becomes 60 mmHg (8 kPa). Discharge from the vent to the outside. Then, the granulated resin composition for forming a light reflecting plate was supplied to a ventilating single-screw extruder having a diameter of 120 mm, and was melt-kneaded at 22 〇t at 201238756, 41440 pif, and then self-installed and extruded. The T-shaped mold at the front end of the machine (sheet width: 1000 mm, slit spacing: 0.2 mm, temperature: 200 ° C), the resin composition for forming a light reflecting plate was extruded into a sheet shape, thereby obtaining a sheet-like extrudate. . Then, the sheet-like extrudate is supplied to a mirror roll including a mirror surface having an outer peripheral surface and a pair of supporting rollers disposed opposite to the mirror roll, and the mirror roll is pressed against the sheet-like extrudate. On the surface, a non-foamed light reflecting plate whose surface was subjected to mirror processing and had a thickness of 〇2 mm and a density of 13 g/cn^ was obtained. In addition, when the resin composition for forming a granulated light-reflecting sheet is melt-kneaded in the cylinder of the ventilating single-axis extruder, the pressure in the cylinder is 6 〇mmHg (8 kPa). The vacuum pump replaces the coated titanium oxide A with the coating gas from the vent opening (Example 14) using the coated titanium oxide B (the average name of the product manufactured by Ishihara Sangyo Co., Ltd. is 25.25 μΠ1). A light reflecting plate was fabricated in the same manner as in Example n. The surface of the titanium oxide containing the purified product and the oxide 曰', ',. The total weight of the coated core was 2.7 wt% relative to the total weight of the titanium dioxide. The other amount was analyzed by fluorescent x-ray analysis on the weight of the paste for the weight of the paste (10) 2, after the oxidation (4) total (Example 15) using the coated titanium oxide fumed titanium C (Ishihara Sangyo Co., Ltd., trade name 201238756 "CR- A light reflecting plate was produced in the same manner as in Example 13 except that 80 μ of the average particle diameter was used instead of the coated titanium oxide A. Further, the coated titanium oxide C is a surface coated with a rutile-type oxidized ion using a coating containing aluminum oxide and a cerium oxide. The amount of the aluminum oxide was quantified by the fluorescent X-ray analysis in the coated titanium oxide c, and as a result, it was 33% by weight based on the total weight of the titanium oxide. Further, in the coated titanium oxide C, the amount of the cerium oxide was fixed by fluorescent X-ray analysis, and as a result, it was converted into Si 〇 2 and was 1.8 wt% based on the total weight of the titanium oxide. (Example 16) In the same manner as in Example 13, except that the coated titanium oxide D (trade name "CR-63" manufactured by Ishihara Sangyo Co., Ltd., average particle diameter: 〇21 μm) was used instead of the coated titanium oxide A. A light reflecting plate is manufactured. Furthermore, the coated titanium oxide D is made of aluminum oxide and cerium oxide.

The coating coats the surface of the rutile titanium oxide. The amount of aluminum oxide was quantified by fluorescent X-ray analysis in the coated titanium oxide D, and as a result, it was i 4 wt% based on the total weight of the titanium oxide after conversion to Ah3. Further, in the coated titanium oxide D, the amount of the cerium oxide was measured by fluorescent ray ray analysis, and as a result, it was converted to si 〇 2 and was 0.7 wt% based on the total weight of the titanium oxide. (Example 17) In the same manner as in Example 13, except that the coated titanium oxide E (trade name "CR·50", manufactured by Ishihara Sangyo Co., Ltd., average particle diameter: 0.25 μm) was used instead of the coated titanium oxide A. A light reflecting plate is manufactured. 52 201238756 41440pif In addition, the coated titanium oxide E is a surface coated with rutile-type titanium oxide using a coating containing an oxide and a cut oxide. In the coated titanium oxide E, the amount of aluminum oxide was quantified by fluorescent X-ray analysis, and as a result, it was changed to 2.3 wt% with respect to the total weight of the titanium oxide after Al2〇3. Further, the amount of the cerium oxide was quantified by the fluorescent X-ray analysis in the coated titanium oxide E, and as a result, it was 0.1 wt% based on the total weight of the titanium oxide. (Examples 18 to 22) The type of the coated titanium oxide was changed as shown in Table 1, and a benzotriazole-based ultraviolet absorber 2 (having a molecular weight of 447.6, trade name TINUVIN (registered trademark) 234) was used. A light reflecting plate was produced in the same manner as in Example 13 except that instead of the benzotriazole-based ultraviolet absorber 1. (Example 23 and Example 24) The amount of the coating titanium oxide was changed as shown in Table 1, and a stupid triazole-based ultraviolet absorber 2 (molecular weight: 447 6, manufactured by BASF Corporation, TINUVIN (registered trademark) 234 was used. In addition to the benzotriazole system external absorbent 1', a light reflecting plate was produced in the same manner as in Example 3. (Comparative Example 7 to Comparative Example 1) A light reflecting plate was produced in the same manner as in Example 13 except that the type of the coated titanium oxide was changed as shown in Table 1, and the coated titanium oxide was not dried by heating. . (Comparative Example 11 and Comparative Example 12) 53 201238756 HlHHUpii* The amount of the coated titanium oxide was changed as shown in Table 1, and the coated titanium oxide was not dried by heating, and the benzotriazole-based ultraviolet absorbent 2 was further used. (Molecular weight: 447.6;; 8:8? Company's product name: 1) (1) (registered trademark) 234) instead of benzotriazole-based UV absorber 丨, except in the same manner as in Example 13. A light reflecting plate is manufactured. (Example 25) Instead of the mirror money, a corrugating roller having irregularities formed on the outer peripheral surface was used, and the unevenness of the outer peripheral surface of the paper was pressed against the surface of the sheet-like extrudate, and the removed flower L was the same as in Example 1. The way to obtain a light reflecting plate. In the obtained reflecting plate, the surface pressed by the corrugating roller was formed into an uneven surface. (Example 26) "C two-coated titanium oxide B (trade name other than Ishihara Sangyo Co., Ltd.): St 〇.25 - instead of the coating oxidized A, 乂, and the light reflection plate was produced in the same manner as in Example 25. (Example 27) "C bismuth coating silver oxide C (the name of the product manufactured by Ishihara Sangyo Co., Ltd.)" The average particle size is 〇.25 μΠ〇 instead of the coating oxidized deficiency A, 亍, this two 卜' A light reflecting plate was produced in the manner related to Example 25. [Example 28] "^吏^ Coating Oxidation D (the name of the product manufactured by Ishihara Sangyo Co., Ltd.) is an average particle size of 〇.21 μΠ〇 instead of coating oxidation. Titanium A, hereby, was made in the same manner as in Example 25. (Example 29) Using a coated titanium oxide crucible (trade name 54 201238756 4l440pif "CR-50" manufactured by Ishihara Sangyo Co., Ltd., average particle diameter A light reflecting plate was produced in the same manner as in Example 25 except that 0.25 μm was used instead of the coating oxide. (Example 30 to Example 34) ° As shown in Table 1, the carbon-coated titanium oxide was mixed. Further, a benzotris-based ultraviolet absorber 2 (molecular weight: 447 6, manufactured by Basf Corporation, TINUVIN) is used. A light reflecting plate was produced in the same manner as in Example 25 except that the stupid triazole was used instead of the ultraviolet absorber 1. (Example 35 and Example 36) The coating was changed as shown in Table 1. In addition to the benzotriazole-based ultraviolet absorber 2 (molecular weight: 447.6, trade name TINUVIN (registered trademark) 234), the benzotriazole-based external absorbent 1 is used in addition to the amount of the titanium oxide. A light-reflecting plate was produced in the same manner as in Example 25. (Comparative Example 13 to Comparative Example 16) The type of the coated titanium oxide was changed as shown in Table 1, and the coated titanium oxide was not dried by heating, and the like. A light reflecting plate was produced in the same manner as in Example 25. (Comparative Example 17 and Comparative Example 18) The amount of the coated titanium oxide was changed as shown in Table 1, and the coated titanium oxide was not dried and dried. A benzotriazole-based ultraviolet absorber 2 (molecular weight: 447.6, trade name: TINUVIN (registered trademark) 234, manufactured by BASF Corporation) was used in place of the benzotriazole-based ultraviolet absorber 1, except that it was produced in the same manner as in Example 25. Light reflectors. 55 20123 8756 ΗΙΗΗυρη' (Comparative Example 19) A light reflecting plate was produced in the same manner as in Comparative Example 13 except that another crepe roll was used as the crepe roll. (Evaluation) The coating contained in the light reflecting plate was measured by the above method. The T-average particle diameter of the layer of titanium oxide. The results are shown in Tables to Table 3. In addition, in the cross section along the thickness direction of the light reflecting plate, the particle diameter was determined by the above method to be 〇1〇pm~〇39 The number of coated titanium oxides that are μηη and unagglomerated. In addition, the number of the coated titanium oxides is measured in a measurement area of ten points arbitrarily selected from the cross section along the thickness direction of the light reflection plate (the size of each measurement area is a square shape of 30 μm on one side). The arithmetic mean values are shown in Tables 1 to 3. Further, the moisture content of the coated titanium oxide contained in the light reflecting plate is also determined by the above method. Further, 30 sheets of test pieces were prepared by cutting the light reflecting plate, and the moisture content of the coated titanium oxide was measured for each test piece according to the above method, and the arithmetic mean value thereof was used as the coating titanium oxide contained in the light reflecting plate. Moisture content. The results are shown in Tables 1 to 3, and further, the resin compositions for forming a granulated light-reflecting sheet produced in Examples 13 to 24 and Comparative Examples 7 to 12 were also measured by the above method. The water content of the coated titanium oxide contained in the resin composition for forming the light reflecting plate. Further, 30 samples were prepared from the pelletized resin composition for forming a light reflecting plate, and the water content of the coated titanium oxide was measured for each sample according to the above method, and the arithmetic mean value thereof was used as the granulated light. The water content of the coated titanium oxide 56 201238756 41440pif contained in the resin composition for forming a reflecting plate. In any of the comparative examples and examples, the water content of the coated titanium oxide contained in the resin composition for forming a granulated light-reflecting sheet was the same as the moisture content of the coated titanium oxide contained in the light-reflecting sheet. Further, the moldability of the light reflecting plate and the light reflectance before the weather test and the light reflectance after the weather resistance test were evaluated according to the following procedures. The results are shown in Tables 1 to 3. The surface smoothness of the light reflecting plate was evaluated according to the procedure described below. The results are shown in Tables 1 and 2. The surface uniformity of the light reflecting plate was evaluated according to the procedure described below. The results are shown in Table 3. The surface roughness Ra, the average interval Sm of the concavities and convexities, the maximum height (Ry) of the concavo-convex surface, the light reflectance, and the diffuse reflectance were measured in the above-described manner for the uneven surface of the light reflecting plate before and after the thermoforming. The results are shown in Table 3. (Surface Smoothness) The surface smoothness of the mirror-finished surface of the light-reflecting sheets of Examples 1 to 24 and Comparative Examples 1 to 12 was visually evaluated. In Table 2 and Table 2, "excellent", "good" (g〇〇d), and "bad" are as follows. Preferably, the portion in which the through hole and the projection penetrating between the both surfaces of the light reflecting plate are formed is one by one. The light reflection plate t is formed in one to three portions through which the through holes and the projections are formed between the both surfaces. Defect: More than three portions of the light reflecting plate having through holes and projections penetrating between the both surfaces were formed. Further, the term "protrusion" formed in the light reflecting plate means that it is inverted by light. The foaming caused by moisture or the like is present, and the convex portion of the light-reflecting sheet is embossed by the mirror-plus-X surface. (Formability) The examples 1 to 24 and the comparative examples were cut out into a plane having a side of 64 Cm, and the light reflecting plate of the example 12 was used in a manner of 35 〇ΐ force to make the handle 2 ===3⁄4 Inverse: Surface: (5) Expansion: Forming 'then from the regulation department: two sides:: Performing the thermal opening of the light reflection plate>. As described above, the 妒 _ plate is continuously formed in a vertical and horizontal direction on substantially the entire surface with % concaves j having a centroid... a rectangular (4) dimension which is horizontally added (10). ==2: 12 are formed in the longitudinal direction, and the concave portion 12 of the light reflecting plate 10 obtained on the short side includes a bottom surface portion 13 having a square shape on one side and a stomach edge from the bottom portion U. The peripheral wall portion 14 in a state in which the money is slowly expanded toward the surface boat, and the inner peripheral surface of the peripheral wall portion 14 is the entire surface. The opening end of the contact portion 14 is formed in a rectangular shape of 3.2 cm in length and 3.5 in width, and the height from the inner surface of the bottom portion 13 to the portion of the connecting portion 15 is 丨6 (10). Further, a planar square-shaped through hole 13a having a side of 0.54 cm is formed across the front and back surfaces of the recessed portion 12 across the front and back surfaces. Further, one of the light reflecting plates was subjected to thermoforming in the same manner as described above, and the surface states of the thermoformed light reflecting plates were visually observed, and the moldability of the light reflecting plate was evaluated based on the following criteria. In Table 2 and Table 2 58 201238756 41440pif, "excellent", "good" (g00d), and "bad" are as follows. Excellent: Among the 100 thermoformed light reflecting plates, there are less than three light reflecting plates on the surface which are uneven in gloss and split. Good: Among the 100 thermoformed light reflecting plates, there are 3 to 10 light reflecting plates on the surface which are uneven in gloss and split. Poor: Among the 100 thermoformed light reflecting plates, there are more than one light reflecting plate with uneven gloss and cracked surface. In addition, it was confirmed by visual observation that the portion where the degree of gloss was locally generated on the surface of the light-reflecting sheet after thermoforming was evaluated as "glossy" on the surface of the light-reflecting sheet after thermoforming. All." In addition, on the surface of the light-reflecting sheet after thermoforming, foaming due to moisture or the like existing inside the reflecting plate may cause a convex portion of 001 mm or more from the surface of the light reflecting plate to be generated or locally generated. The concave portion or the cracked person 5 has only created a "crack" on the surface of the light reflecting plate. (Weather resistance test) A test piece of 50 mm in length and 150 mm in width was cut out from the light reflecting plate, and the test piece was subjected to an accelerated exposure test in accordance with JISA1415 (Promoting Exposure Test Method for Plastic Building Materials) under the following conditions. Irradiation device: Trade name made by Suga Test Instruments

Sunshine Super Long-life Weather Meter WEL-SUN-HC-B type, shooting conditions: back plate temperature: 60 ° C ~ 70 ° C, sprayer spray: no test tank temperature: 453⁄4 ~ 55. (: Relative humidity: 10%~30〇/〇 59 201238756

(Light reflectance) In the light-reflecting sheets of Examples 1 to 24 and Comparative Examples 1 to 12, the above-described accelerated exposure test was performed for 500 hours before the above-described accelerated exposure test, and the above-mentioned accelerated exposure was performed in the following manner. The light reflectance of the test piece after 1000 hours of the test. Further, a test piece was prepared, and the arithmetic mean value of the light reflectance of each test piece was taken as the light reflectance. Further, the measurement of the light reflectance was performed on the processed surface of the test piece. In the light-reflecting sheets of Examples 25 to 36 and Comparative Examples 13 to 19, the light reflection of the test piece before the above-described accelerated exposure test and after the above-described accelerated exposure test for 1,000 hours was measured in the following manner. Further, '30 test pieces were prepared', and the arithmetic mean value of the light reflectance of each test piece # was taken as the light reflectance. In addition, light reflection a is performed on the uneven surface of the test piece. The light reflectance of the J疋疋 test piece is referred to as 8 according to the method B measured in JIS K71〇5. The light reflectance at a wavelength of 55 〇 nm of the total reflection light is measured under the shooting conditions, and is expressed by the absolute value of the light when the sulphur coffee plate is used as the target plate. Specifically, an ultraviolet-visible spectrophotometer sold by Shimadzu Corporation, "UV-2·", and an integrating sphere sold by the company under the trade name "ISR•Measure" Inner diameter: (p6Gmm) was combined to determine the light reflection of the test piece. (Surface uniformity) For the case of Example 25 to Example 36 and Comparative Example 13 to compare the light of the (2012) to the light of the 201238756 41440pif plate, the surface was evaluated by the following method. Specifically, the uneven surface of the light reflecting plate was visually observed to confirm whether or not a convex portion or a through hole penetrating between the two surfaces was formed in the light reflecting plate. Further, "any portion of the uneven surface of the light reflecting plate" In the measurement unit D having a flat square shape of 64 cm on one side, as shown in FIG. 5, an interval of 8 cm is defined on a straight line connecting the intermediate points of the mutually opposing sides in the measurement unit D. The measurement point E' is measured and the diffusion reflectance at each measurement point is measured in accordance with the measurement method described in JIS K71〇5. In Table 3, "exceiient", "" Good" (g〇〇d), and "not "Bare" is as follows. Preferably, the portion of the light reflecting plate in which the through hole and the convex portion are formed between the both surfaces is a single portion, and the maximum value of the diffuse reflectance of all the measurement points is The difference between the minimum values is 0.2% or less. Poor. The dad and the minimum of the diffuse reflectance of more than three or all of the measurement points E formed in the light reflection plate in which the through holes and the convex portions are formed between the both surfaces thereof. The difference between the values is equal to or higher. The light reflection plate other than "excellent" and "bad" is evaluated as "good". Further, the term "protrusion formed in the light reflection plate" means moisture due to the internal domain of the light reflection plate. When the trigger bubble is cited, the apex of the largest convex portion of the uneven surface of the light reflecting plate bulges a convex portion of 0.03 mm or more. The difference between the maximum value and the minimum value of the diffuse reflectance of all the measured points is large. Concavities and convexities are not uniformly formed on the uneven surface of the light reflecting plate, or a through hole having a thickness deviation or a two-way gap is formed in the light reflecting plate. 201238756 (Formability) Sheet cutting: Column 36 and Comparative Example 13 to _^ Cut out the plane with the edge of 64 coffee. The formula uses 35〇Μμ =, and its surface becomes the outer peripheral (fourth) part. By _ into =, after, four parts are removed... from the concave-convex surface (table: ==== pulse forming, then from the specified part The hot forming of the cut moon is performed. As described above, it is possible to continuously form 96 concave portions 12 and a flat rectangular shape (4) in the vertical and horizontal directions on the surface of the heat-reflecting sheet. Further, the concave portion 12: 12 in the longitudinal direction, and the concave portion 12 of the light reflecting plate 1 形成 which is formed in the short-side direction includes a bottom portion 13 having a side shape of a 咖6 coffee, and The outer peripheral edge of the bottom surface portion 13 is extended to the surface side so as to extend the circumferential wall portion 14 in a state of being gradually expanded, and the inner peripheral surface of the peripheral wall portion 是 is formed as a light reflecting surface. Further, the mutually adjacent concave portions 12 and 12 are integrally formed with each other at the end edge of the closing portion via the connecting portion /5 formed in a lattice shape. The open end of the peripheral wall 14 is formed into a flat rectangular shape having a length of 3·2 cm' 杈 3.5 cm, and the height from the inner surface of the bottom surface portion 13 to the top of the joint portion 15 is 16 cm. Further, a flat square-shaped through hole 13a having a side of 〇% cm is formed across the front and back surfaces of the recessed portion 12 across the front and back surfaces. Further, 'the surface of the thermoformed light-reflecting sheet was visually observed by thermoforming one of the light-reflecting sheets in the same manner as described above, 62 201238756 41440pif and evaluating the formability of the light-reflecting sheet according to the following criteria . In Table 3, "excellent", "good" (g〇〇d), and "bad" are as follows. Among the 100 thermoformed light reflecting plates, less than three light reflecting plates are formed on the surface. Good: Among the 100 thermoformed light reflecting plates, the number of light reflecting plates on the surface is 3 to 1 。. Poor: Among the 100 thermoformed light reflecting plates, more than one light reflecting plate has been generated on the surface. Furthermore, it will be on the surface of the light reflecting plate after thermoforming, due to the inside of the reflecting plate. Foaming caused by the 7K fraction of the P, and the convex portion of the largest convex portion of the uneven surface of the light reflecting plate bulging 〇〇 3 mm or more, or the concave portion is locally generated or generated The cracker was evaluated as having a "crack" on the surface of the light reflecting plate. (Evaluation of the uneven surface of the light-reflecting sheet) The surface roughness R, the average interval Sm of the unevenness, and the uneven surface of the light-reflecting sheet of the examples 25 to 36 and the comparative example 13 to the comparative example 19 were measured in the above manner. Maximum height (Ry). The peripheral wall portion 14 of the concave portion 12 in the light reflection plate obtained by thermoforming the light reflection plate of Examples 25 to 36 and Comparative Example 13 to Comparative Example 19 was arbitrarily cut out in three places, and the test was performed. sheet. The arithmetic mean value of the surface roughness Ra of the surface roughened sheet of the uneven surface of each test piece was measured as the surface roughness Ra of the light reflecting plate. The average interval between the unevenness of the uneven surface of each test piece was measured 63 201238756

Sm, the arithmetic interval of the average interval Sm of the unevenness of the test piece is === Μ. The maximum southness (Ry) of the uneven surface of each test piece was measured, and the maximum height of the uneven surface of the test piece was two, and the average value was taken as the maximum height of the uneven surface of the light reflecting plate. The average value of the light reflectance of the test piece was taken as the light reflectance of the light reflecting plate. The light-reflected surface of the examples 1 to 5% and the comparative example 1 to the comparative example 12 were subjected to the above-described average surface roughness Sm of the surface roughness and the maximum height (Ry) of the uneven surface. In : Example 2 ~ Example 24 and comparative examples! ~ The light roughness Ra of the surface of all the light reflecting plates of Comparative Example 12 was 〇.4 μη, the average interval of the unevenness was i μπι, and the maximum height (Ry) of the uneven surface was 1 119. (Average Brightness) The light-reflecting sheets of Examples 25 to 36 and Comparative Examples 13 to 19 were measured for the average brightness of the uneven surface of the light-reflecting sheet before the heat was applied in accordance with the above-described method. Specifically, the brightness of the liquid crystal pupil plane when the light reflection plates of Examples 25 to 36 and Comparative Examples 13 to 19 were used as the light reflection plate of the liquid crystal display device was evaluated. A notebook computer (trade name "Latitude LSH4GGST") with a size of 121 inches for LCD screens sold by DELL is prepared. Instead of the reflective film of the moonlight source of the personal computer, the light reflecting plate obtained in the example or the comparative example was used instead of the reflecting film. Using a luminance meter (manufactured by Topcon Technohouse Co., Ltd., "BM-7"), the brightness was measured at a position of 500 mm from the intersection of the diagonal lines of the liquid crystal screen in a direction orthogonal to the pupil plane of the liquid crystal 64 201238756 41440 pif. (Diffuse Reflectance) The light-reflecting sheets of Examples 25 to 36 and Comparative Examples 13 to 19 were thermoformed in the above manner under the injection conditions of 0° in accordance with the measurement method B described in JIS K7105. The uneven surface of the light reflection plate before and after was measured. The diffuse reflectance after the thermoforming was measured on the uneven surface of the peripheral wall portion 14 of the concave portion 12 in the light reflecting plate. 65 201238756 J-ao inch»»I inch [I <] Comparative example v〇〇1 < ο ο o ^>4 o ο V*J ^-Η Ο l〇ο < 〇ΓΛ <N — Vo 00 ο oo <N 〇»·Η ΓΛ 〇〇On ο oo OS νΊ 〇Γ〇... cn yr) omo ο «-Η Ο ο C 〇〇ΓΟ CN VO 00 d 00 cs o S Bad 〇οό 0 \ σί 〇〇〇 〇〇〇<ri oo »Τ) Ο ο ΙΟ ο ω 〇〇cn cs Ο ^T) tn o (N o K* ^ K- ^ m οό On cn ε; 〇οο an iTi <ndd , 4 Ο ο ιη ι 4 Ο 〇 〇 Ο Ο (NO ι i (N og » «Μ 不良 bad r〇00 m σί <N 〇>—Η 00 oo ν> Ο ο »Τ) Ο υ 〇P < m cn oo v〇v〇〇<N o ψ-Μ bad ii <N OO a\ σ\ ΟΝ ο oo κη o V) o V"i ο ο ν-> Ο < 〇CO <N — vo 00 o 00 (N 〇S bad bad cs oo Os σ\ Ον CS ο o yn 〇 _ ο ι〇«—1 ο ν*ί Ο < ο CO (N — P; o 00 < So S inch ON 06 On οό Ον ο m a m to o O ο ιη ο ιη ο < ο PH ΓΟ <N — P; o oo <N o CN cn C N oo as Ο ΟΟ Ο 〇ο FH oo vn ir> 〇wj o ο ^Η ο ο ω ο CO r4 w < d ON <N om CN o oo <N vo oo 〇\ σί On ο oo cn v -) 〇v〇d ο ν-> ο V) »-Η Ο Q ο *«Η 卜o 〇\ (N 〇?—H <N ov〇VO cs v〇00 ν〇σί 00 ο oo mo Vn o ο Ό Ο U-) ο U ο ο ΓΛ 00 ψ-^ o (N o vo 00 CN v〇06 ON ΓΛ 00 σ\ οο 00 rn tn oo ο ο V) ο m ο ο r- (N VO rn art o w-><N 〇v〇oo CN VO oo ON ΓΛ οό ο oo wi oo ο ο ο < ο ο CO <N o 00 (N o to ίΜ m VO 00 On m 00 Os ο 00 w-> o in o •Τ) 1"^ ο ο ο ω ο ο m CN ψ·^ o G\ CN d <N 〇vo 00 CN V〇oo Os σί 寸ο 00 in o in « -^ O ^Ti Ο ο ο Q ο 卜 o ON (N 〇w^* <N 〇v〇vo <N \〇οό ON σ\ ο oo ... f·1 md u-> d V» Ο ο »Λ> ο υ ο ο CO oo o (SO SO oo CN •ΰώΐ vo OO ON m οό 〇\ (N ο 00 rS to om O ν-> ••μ ο ο ο PQ ο ο 卜<Ν V〇cri 芝 o u-> (S ov〇00 <N Όϋί v〇OO On m oo On rM ο ^-4 00 moo νη ο ο Ο < ο ο fn (N inch. o 00 <N o <N m so oo 〇\ m od ON Polypropylene coating oxidation Titanol phenol antioxidant Phosphorus antioxidant UV absorber 1 UV absorber 2 1 Hindered amine light stabilizer Titanium oxide type Titanium oxide 矽 Oxide moisture content [Wt°/o] Average particle size [μηι] 〉:&&&&&&&&&&&&&&&&&&&&&& Cn 00 〇o σί m 〇CN OO ε; 〇o cn 〇1 vd On fN p ro 〇1-H 1 v〇On CS ro 〇 inch 00 〇m 〇inch〇〇s; 〇CO 〇〇6 〇\ 00 〇m 〇in 00 〇ov〇〇1 VO σ\ rji pv〇ο 1 vd 〇\ rji m O 00 00 ο mo oo 00 ο s; m O 00 00 ο o VO ο 1 vd 〇\ (Ν 〇Ο * 4 1 vd ON CN m 〇OO s; 00 ο m 00 οο ο O 〇\ cn 00 00 ο os; ^ ^ ^ 暴露 Exposure for 500 hours to promote exposure 1000 Hour U-1 > -4 201238756 J-ao inch inch i inch [(N^u Comparative Example CN o ο d O ο U~) Glue < Ο ο < ο > 4 ΓΠ <N v〇00 o OO o κ· wm od ON Ο 〇ό ON ΓΟ ο si 〇〇〇om ... cn o O ο W") »«Η Ο ο < ο ^-Η CO CN V〇00 o OO tN 〇g \4^ Ό^ί κ- ^ o OO as 卜σ\ m ο CN 〇i 00 〇oo 00 tn oo iT) Ο ο ο ω Ο CO 〇ioo <N 〇ζ; \^ ·ΐώί Κ- ^ r〇od On Γ〇ο *< I cn vd ON 〇CN On o 00 l l〇i〇»"H o »no <〇ο ο ?·Η ο Q Ο ^Η Ι^Η 卜 o CN ^T) d T*H CN og »—Η m od 〇\ CO ε; Ο 1 CO VO ON Ο cs OO o 00 ^r\ d iTi 〇yn ο ο ο υ Ο m cn 00 —_ — v〇v〇c><N o κ· ^ ^· -Ώϋί (N OO a\ 97.9 Ο ON 00 ο 卜 or··^ OO <η l〇o 〇in Ο ο ο < ο Γ〇<N 00 o OO < N o S κ- κ- ^ CN od On Ο) 〇i ΓΟ ο On 00 ο o *—H ο oi〇o ο νη Ο ο < ο ΓΛ (N — P: o 00 <N o S inch ON 00 〇\ ο 00 ο m ο OO ON οο ο m (N om ^r&g t; 〇·—H o ο *"Η Ο »**H ο C Ο »·Η ΓΟ CN ^f· o 00 (N 〇CS m (Ν m od ON ο 〇6 ΓΟ Ο 〇i 00 ο ( N N W W W a\ ο I v〇v〇O ο <Ν c^io 00 r«S d iT) o ο W) Ο *〇1-Η ο Q ο 卜 o On (NO <N 〇ν〇Ό < Ν 00 00 ON Ο 1 v〇〇\ Ο CN so 00 ΓΛ *-^ do ο m ο ι〇ο υ ο CO rn OO 艺 om CN O νο 00 CN VO od ON m οό ο ΓΟ Ο OO s; 00 ο 1 〇 \ o 00 rn d in ^<H o ο »η ο ο PQ ο 卜 CS v〇ΓΟ d (N 〇ν〇00 <Ν vo od On m od ON m ο OO s; ΟΟ Ο 00 oo 00 ΓΟ o ir> 〇ο ο ΙΛ ο < ο ΓΟ CN — p; o 00 (N 〇^Ti <Ν vo vo od ON m 〇6 On m ο OO si 00 ο 卜o H 00 U"iom Ο ο »Τ) ο ω ο ο *«Η m CN »"H 〇On CN 〇yn (NO νο 00 CN J^i VO od 〇\ v〇Os ρ ι«Η 1 v〇On ο (Ν oo H 00 rn v*> yn d V") o »"Η Ο ο *Τ ) ο Ρ ο Γ Ο On (N 〇d ν〇ν〇CN ^d. XtU vo od Cn On Ο 1 Ό vb 〇\ Ο (Ν* to o 00 <r> do ο ο 1** ο υ ο CO rn OO d tn (NO ν〇οο (Ν Ίώί XtU v〇od Os m 00 0\ m ο OO 〇i 00 ο 寸 o 00 fO d 〇νη Ο ο 'Λ ^«Η Ο 0Q ο ο 卜 fS v 〇ro 芝 d v) <N 〇ν〇00 <N v〇od 〇\ m 〇6 ON m ο OO si 00 ο mo 00 ΓΛ 'Λ in o W-> o ο ο Ο < ο ΓΛ CN — P; d 〇〇(N 〇ι〇CN m -0^ VO 00* On m od om ο 00 σ! οο ο Polypropylene coated titanium oxide phenol antioxidant phosphorus antioxidant UV absorber 1 i UV Absorbent 2 Hindered amine light stabilizer titanium oxide type titanium oxide aluminum oxide tantalum oxide moisture content [Wt ° / o] average particle size [μτη] ι|ΐ ρ ^ι 1 = «· forget one cup: ε ; ^iS Surface smoothness Formability test 1 Test before and after weather resistance test Weather resistance test Weather resistance test ^ Λ Λ 蠄 蠄 帮 2 2 fflT coated titanium oxide light reflection plate Titanium oxide light reflectance [%] S9 201238 756

Ja0 inch inch I inch difference between before and after seven 69 201238756 4144Upif According to Table 1 and Table 2, the light reflectance of the 2t light reflector is different from that of the comparative example. For example, ^ will be indicated. 7.4%, and with the use of the light reflecting plate of the present invention in the liquid crystal display device, the surface of the light guide plate is reflected back to the surface of the light guide plate after being reflected by the light-reflecting plate. The side, that is, the liquid a 曰 panel side is led out, but the reflection of light between the front and back surfaces of the light guide plate and the light reflecting plate is repeated tens of thousands of times. Therefore, the light reflecting plate of the present invention is compared with the comparative example. The light reflectance is increased by about 0.3% to 0.4%. However, as described above, the reflection of light is repeated for tens of thousands of times and then reaches the liquid crystal panel. Therefore, the light reflectance of the light reflector is less than 0.3% to 0.4%. The brightness of the liquid crystal panel is extremely poor. Therefore, the brightness of the liquid crystal display device can be greatly improved by using the light reflecting plate of the present invention for the backlight unit. 201238756 [e<] J'ao inch inch i inch inch \ 1 < oo oo m* o in od ο «7Ί o < ο CO <N inch* v〇oo 〇oo cs os \4^· CN 〇6 〇> ON oo Ο 〇〇or—^ O > * ir> o »n 〇o ι«Η oo C ο *~Η —Η tn fS — | 0.86 1 oo CN 〇» i K- ^ K- 00 On »-Η 1 卜»—Η om ammo »* hoo in doc Ο 1 _ < ro <NV〇CO o OO CN og K" 〇OO Os CN 〇> ΟΟ Ο Comparative example o 00 <ri 〇 n n oo oo oo N N N N N N ?^Η r- o (N yn O (N 〇g K" ^ Κ- ^ CO od On cn vd On Ο (Ν o o oo l〇o iTi ooo tr> Ο U ο ο m ΓΟ oo | 0.66 1 m (NO \4^ ^ Κ* (N OO a\ 寸 S; 00 ο ΓΟ oo oo in ^T) dl〇ol〇do un Ο < ο *"Η rn CN ¥ | 0.86 1 oo cs os CN OO σ\ 97.4 00 ο Instance VO CO o iH oo in oo U-) d Ο < ο »-H CO CN ! 0.37 | oo cs o inch On 〇6 a\ ”爿οό On 00 ο moom <r; m 〇w> ooo Ο < ο ο r〇(N — P; o oo CN 〇<N m <N cn od 〇ζ\ 00 ο black o oo mo ««•H oo yn C5 Ο tu ο ο CO H d O\ (N o (N 〇 VO oo <N v〇oo On ν〇ν〇ΟΝ ο <Ν m ΓΟ o oo «r; d »r> 〇od ν-> Ο P ο »-Η ^t Ι—Ή卜d 〇\ (N 〇o CN VO od σ\ ν〇νο ΟΝ Ο <Ν CN fO o oo rr; o »r> oo V〇d νη • 4 Ο u ο ο cn cn 00 t—H | 0.34 1 to cs o V〇oo cs 98.6 ΟΟ 00 Ο ΓΟ o oo rn w-ϊ oi〇ooo ιη Ο PQ ο ο 卜 <N VO ΓΛ s (M o V〇00 (NV〇oo σ\ ΟΟ σί ΟΟ Ο 沄oo oo TH o VO do ^-H o U-) Ο < ο *—Η ΓΟ <N — | 0.37 I oo (N 〇IT) (N CO 98.6 00 〇〇ο ON CN o *—H 00 <r; in o 0.15 0.15 o U-) τ—ί ο ω ο ο cn CN F—H o | 0.29 I (N 〇v〇oo (N Όώί 98.6 96.6 Ο (Ν 〇〇<N oo 00 0.15 0.15 0.15 o 0.15 Q ο 卜d | 0.29 | *—h CM 〇v〇(N Ίώί 98.6 ;96.6 Ο (Ν o oo IT; yrt d 0.15 0.15 o 0.15 ' U ο ο CO ΓΟ oo L〇^j 0.25 v〇00 (N 98.6 〇〇Ον 00 Ο VO cs oo oo in m <r«H oo yn oo ο PQ ο ο 卜 (N vo CO L〇^il l〇cs Ov〇00 cs -Qfii v〇OO Os 〇〇σ\ 00 ο CN o oo CO d v> o wj do Ο < ο CO (N inch' | 0.37 1 oo (N o in CN cn Od 〇\ ΟΟ S; 00 ο Polypropylene coating titanium oxide phenol antioxidant phosphorus antioxidant UV absorber 1 UV absorber 2 Hindered amine light stabilizer titanium oxide type titanium oxide aluminum oxide tantalum oxide moisture content [wt%] average particle size [μπι] ) S PCT! ~~, tip 〇^l§ ^ ^ M Π Π Π , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 〇\ (N m vo oo (S od ON CN ON σ\ 〇6 〇\ s; inch 〇 00 VO oo 〇 r r ο 〇 〇 a a 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 On On On On Io έ inch 〇g oo CO od ON inch inch ο (N od On CO inch 〇»·Η g 00 ΓΟ 〇6 σ\ inch inch d ^•Η CN 00 〇\ m inch 〇g 00 CN OO 〇> m 窆 inch ο od 〇\ inch〇g oo CN 00 as mt inchο oo as <N inch σ\ ON 〇6 〇\ Ο) ON inch 〇 \ 00 00 ON 00 S: inch 〇 \ (N Γ-» 〇\ m 00 ON cn inch 〇 \ CN 〇6 os CN 〇i inch inch \ <N y/Ί VO On v〇00 〇\ vq Os inch σ\ »r> oo os αί m <Ν σ\ ir> VO v 〇oo ON σί m 00 Q\ U-) si <N CS ΓΟ 0\ v〇ON vo od ON vq ίΝ (Μ cn Ch 00 Os ON m fN| ON tn v〇ON V〇od ON vq On ΓΟ ' Λ 00 On in ON inch C\ CN 卜Os Ό 00* ON vq si σ\ oo On si CN CN ro ON 卜 T T T r r r r r r ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON » » On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On On 〇OO Os CO OS inch σ\ ••H v*> oo On CN ΓΛ (N ON in 卜 to ON VO 00 ON rn os CO od On CN si inch 〇\ (N 卜 ON v〇00 ON cn σ\ Inch 0\ oo On CS ON Difference before and after inspection 1 1 Surface roughness Ra (μπ〇 average interval of unevenness Sm (μηι) Maximum height Ry (μπι) Average brightness (cd/m2) Tea ^~s Surface roughness Bri ( Μτη) Average interval of concavities and convexities Sm ( μπι) Maximum height Ry (μπι) ^ r-\ g* 2 7.201238756 41440pif f Industrial Applicability] The light reflecting plate of the present invention can be incorporated, for example, into a word processor or an individual. Backlighting unit of computer, mobile phone, navigation system, television, portable television, etc., backlight of the solar illumination system such as lighting box, only strobe illuminator, photocopying It is used in lighting devices such as projectors, projectors, fax machines, and electronic blackboards. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view of a backlight unit in which a liquid crystal of a light reflecting plate of the present invention can be preferably used. $ bullying _ 2 is a perspective view of the thermoformed light reflecting plate of the present invention. Figure 3 is a longitudinal section of a thermoformed light reflecting plate of the present invention. A complex longitudinal scraping view. The light reflection plate of ', and FIG. 5 is a plan view showing the measurement point of the diffuse reflectance. [Description of main component symbols] W: Light reflection plate 12: Concave portion 13: Inner bottom surface Ua of concave portion: Through hole 14: Inner circumferential surface 15: Connection portion 2: Light diffusion layer 21: Translucent particle 73 201238756 4丄 (4) Upif 30: Light guide plate 40: Illumination light source 50: Lamp reflector 60: Frame 61: Bottom portion 62 of frame: Peripheral wall portion 62a of frame: Segment portion 70 of frame: Light source body 71: Substrate 80: Optical sheet B : Illumination device C : Illumination body D : Measurement unit E : Measurement point L : Light-emitting diode

Claims (1)

201238756 41440pif VII. Patent Application Range: 1. A light reflecting plate comprising: a fine haze resin 1 〇〇 by weight; and a coated titanium oxide 20 parts by weight to 12 〇 by weight, which is utilized by using aluminum The coating of the oxide and the cerium oxide is formed by coating the surface of the titanium oxide, and the water content is 0.5 wt% or less. 2. The light reflecting plate according to claim 2, wherein the polyolefin resin comprises a polypropylene resin. 3. The light reflecting plate of claim 2, wherein the polyolefin resin comprises homopolypropylene. 4. The light reflecting plate of claim 2, wherein the light reflecting plate has a thickness of 0.1 mm to 1.5 mm. 5. The light reflecting plate according to Item 1, wherein at least one surface is formed as a concave-convex surface, and the surface roughness of the uneven surface is i to 20 μm and the average interval Sm of the unevenness is 5 μηι 3 〇〇μβ1. 6. The light reflecting plate of claim 5, wherein the maximum height (Ry) of the uneven surface is 5 μm to 80 μm. A resin composition for forming a light reflecting plate, comprising: 100 parts by weight of a poly-smoke-based resin; and 20 parts by weight to 120 parts by weight of the coated titanium oxide, which is composed of an aluminum oxide and a cerium oxide. The coating layer is formed on the surface of the titanium oxide, and the water content is 0.5 wt% or less. 3. A method of producing a light-reflecting sheet, comprising: supplying a resin composition for forming a light-reflecting sheet to an extruder for performing a step of extruding from a extruder after melt-kneading at a flow of 75 201238756 4144 Upit, The resin composition for forming a light reflecting plate comprises: 100 parts by weight of a polyolefin resin; and 20 parts by weight to 120 parts by weight of the coated titanium oxide, which is oxidized by a coating layer containing aluminum oxide and cerium oxide. It is formed on the surface of titanium and has a water content of 0.5 wt% or less. 76