JP2007114453A - Light guide plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light guide plate made of thermoplastic resin composition excellent in brightness, transfer property, hue, weather resistance, mechanical strength and heat resistance. <P>SOLUTION: The light guide plate comprises an aromatic polycarbonate-alicyclic polyester resin composition which contains at least one kind of compound selected from a group comprising phosphorus based compounds (C) expressed by specified structural formula by 0.001 to 0.3 pts.wt. with respect to the total 100 pts.wt. consisting of aromatic polycarbonate resin (A) having viscosity average molecular weight 10,000 to 25,000, 50 to 100 pts.wt. and alicyclic polyester resin (B), 5 to 50 pts.wt. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light guide plate comprising an aromatic polycarbonate-alicyclic polyester resin composition. More specifically, the present invention relates to a light guide plate having an aromatic polycarbonate-alicyclic polyester resin composition as a main component and excellent in luminance, transferability, hue, weather resistance, mechanical strength, heat resistance, and moldability.

In general, optical fibers and optical waveguides (web guides) in the field of optical communication are known as devices that efficiently guide light to a target region using total reflection due to a difference in refractive index between air and a material. In the field of illumination optics such as a liquid crystal display device, the light guiding properties are distinguished from the above-mentioned ones and are collectively referred to as a light guide plate.
Specific examples of the light guide plate include a display device portion for automobiles such as a needle and a scale such as an automobile speedometer. A light guide plate is used to efficiently guide light to such a portion.

  As such light guide plates other than display devices for automobiles, liquid crystal display devices used for liquid crystal televisions, personal computers, mobile phones, PDAs, and the like are known. In general, the light guide plate is designed so that light incident from the side surface can be guided uniformly and efficiently to the liquid crystal display side. And in recent years, in order to cope with the demand for thin, light weight, power saving, high brightness and high definition of liquid crystal display devices, a point light source such as an LED or a bar light source such as a cold cathode tube and a light guide plate are combined. A planar light source device is frequently used. The light guide plate in this planar light source device is usually given a fine shape, such as having a wedge-shaped cross section with a uniformly inclined surface.

  Conventionally, the light guide plate has been molded from a resin material such as polyacrylamide (PMMA). However, in recent years, the heat generated inside the device in which the light guide plate is incorporated tends to increase. Many light guide plates are used.

  Aromatic polycarbonate resin is excellent in mechanical properties, thermal properties, electrical properties, and weather resistance, but its light transmittance is generally lower than that of PMMA. Therefore, light guide plate and light source made of aromatic polycarbonate resin When the surface light source body is configured from the above, there is a problem that the luminance is low. As a method for solving such a problem, several methods for increasing the luminance of the light guide plate made of aromatic polycarbonate resin have been proposed.

For example, a method of adding a specific acrylic resin and an alicyclic epoxy has been proposed (see, for example, Patent Document 1). Further, as a substrate for a liquid crystal display panel having excellent optical properties and heat resistance, a copolymer polycarbonate resin comprising 3,3,5-trimethyl-1,1-di (4-phenol) cyclohexylidene, bisphenol A and a bisphenol component. Has been proposed (see, for example, Patent Document 2). And 100 parts by weight of a resin composition comprising as a main component a polycarbonate copolymer in which 5-95 mol% of the total aromatic dihydroxy component is 9,9-bis (4-hydroxy-3-methylphenyl) fluorene, and an ultraviolet absorber There has been proposed a light guide plate formed of a resin composition having high refraction and excellent heat resistance composed of 0.01 to 5 parts by weight (see, for example, Patent Document 3).

Furthermore, an optical component such as a transparent substrate of a liquid crystal display device made of a polycarbonate resin-alicyclic polyester resin composition has been proposed (see, for example, Patent Document 4). Also, a retardation film composed of an aromatic polycarbonate resin and an alicyclic polyester resin and having good color accuracy has been proposed. By including mono- and di-stearyl acid phosphate, color display and color accuracy may be improved. It is described that a phosphorus stabilizer may be contained (see, for example, Patent Document 5).

JP-A-11-158364 JP-A-11-174424 JP 2005-018993 A JP 2003-176401 A JP 2005-165085 A

  However, for example, in the method described in Patent Document 1, it is inevitable that the resulting resin molded product becomes clouded by the addition of an acrylic resin, so the light transmittance and luminance cannot be increased, and an alicyclic epoxy is added. However, there was a problem that a sufficient improvement effect was not recognized. Further, even with the method described in Patent Document 2, the weather resistance and hue are insufficient.

  On the other hand, the resin composition described in Patent Document 3 has a problem of poor practicality because of high melt viscosity and low transferability and hue. The resin composition described in Patent Document 4 also has a satisfactory heat-resistant optical component because the hue and brightness of the resin molded product are lowered due to insufficient heat stability and the weather resistance is insufficient. Couldn't get.

  Further, although Patent Document 5 describes that the hue of the retardation film is improved by containing a specific phosphate compound, there are problems and solutions for the light guide plate, and more important characteristics of the light guide plate. There is no description or suggestion about the improvement of the balance of brightness, uniform light propagation, fine shape transferability, and injection moldability.

  The object of the present invention is to solve the above-mentioned problems, satisfy not only brightness but also various properties such as transferability and hue, as well as weather resistance, mechanical strength, heat resistance, and moldability at the same time. The object is to provide an excellent light guide plate.

  As a result of intensive studies to achieve the above object, the present inventors have obtained a specific phosphorus compound, specifically a specific organic (sub) phosphoric acid, in an aromatic polycarbonate-alicyclic polyester resin composition. A light guide plate containing a specific amount of a phosphorus compound selected from the group consisting of esters and metal salts thereof is not only brightness but also transferability and hue, as well as weather resistance, mechanical strength, heat resistance, moldability, etc. The present invention has been completed by finding that the light guide plate satisfies the various properties at the same time, is well-balanced, and has a very high practicality.

  That is, the gist of the present invention is that (A) 50 to 95 parts by weight of an aromatic polycarbonate resin having a viscosity average molecular weight of 10,000 to 25,000, and (B) 5 to 50 parts by weight of an alicyclic polyester resin. 0.001 to 0.3 parts by weight of at least one compound selected from the group consisting of the compounds represented by (C) the following general formulas (I) to (VI) with respect to 100 parts by weight of the following total: It exists in the light-guide plate containing an aromatic polycarbonate-alicyclic polyester resin composition.

Formula (I)
O = P (OH) _n (OR) _3-n (I)
(In general formula (I), R is an alkyl group or an aryl group, and may be the same or different. N represents an integer of 0 to 2.)

Formula (II)

（一般式（ＩＩ）中、Ｒ'はアルキル基またはアリール基であり、それぞれ同一であって
も異なっていてもよい。）

(In the general formula (II), R ′ is an alkyl group or an aryl group, which may be the same or different.)

Formula (III)

（一般式（ＩＩＩ）中、Ｒ¹〜Ｒ⁴はアルキル基またはアリール基であり、それぞれ同一であっても異なっていてもよい。Ｍはアルカリ土類金属および亜鉛より選ばれる金属を表す。）

(In the general formula (III), R ^{1 to} R ⁴ are alkyl groups or aryl groups, which may be the same or different. M represents a metal selected from alkaline earth metals and zinc.)

Formula (IV)

（一般式（ＩＶ）中、Ｒ⁵はアルキル基またはアリール基であり、Ｍはアルカリ土類金属
および亜鉛より選ばれる金属を表す。）

(In general formula (IV), R ⁵ represents an alkyl group or an aryl group, and M represents a metal selected from alkaline earth metals and zinc.)

General formula (V)

（一般式（Ｖ）中、Ｒ⁶〜Ｒ¹¹はアルキル基またはアリール基であり、それぞれ同一であ
っても異なっていてもよい。Ｍ'は３価の金属イオンとなる金属原子を表す。）

(In the general formula (V), R ^{6 to} R ¹¹ are alkyl groups or aryl groups, which may be the same or different. M ′ represents a metal atom that becomes a trivalent metal ion.)

Formula (VI)

（一般式（ＶＩ）中、Ｒ¹²〜Ｒ¹⁴は、アルキル基またはアリール基であり、それぞれ同一であっても異なっていてもよい。Ｍ'は３価の金属イオンとなる金属原子を表し、２つの
Ｍ'はそれぞれ同一であっても異なっていてもよい。）

(In the general formula (VI), R ^{12 to} R ¹⁴ are alkyl groups or aryl groups, which may be the same or different. M ′ represents a metal atom that becomes a trivalent metal ion; Two M's may be the same or different.

  The light guide plate of the present invention has high brightness, high transferability, and excellent hue, weather resistance, mechanical strength, and heat resistance compared to conventional light guide plates made of aromatic polycarbonate resin. It can be expected to be used as a planar light source device component in a wide range of applications such as portable terminals, cameras, watches, notebook computers, displays, lighting, signals, automobile tail lamps, and electromagnetic cookers.

  Hereinafter, the present invention will be described in detail.

[1] Aromatic polycarbonate resin (component A)
The component A in the present invention is (A) an aromatic polycarbonate resin, for example, a linear chain obtained by reacting an aromatic dihydroxy compound and a carbonate precursor, or a small amount of a polyhydroxy compound in combination with these compounds. Or a branched thermoplastic aromatic polycarbonate polymer or copolymer.

  The (A) aromatic polycarbonate resin in the present invention is not particularly limited and can be produced by a known method, for example, an interfacial polymerization method, a melt transesterification method, a pyridine method, a ring opening of a cyclic carbonate compound. Examples thereof include a polymerization method and a solid phase transesterification method of a prepolymer.

As aromatic dihydroxy compounds used as raw materials, 2,2-bis (4-hydroxyphenyl) propane (= bisphenol A), 2,2-bis (3,5-dibromo-4-hydroxyphenyl) propane (= Tetrabromobisphenol A), bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxy) Phenyl) octane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, 1,1-bis (3-tert-butyl-4-hydroxyphenyl) propane, 2,2-bis (4-hydroxy-) 3,5-dimethylphenyl) propane, 2,2-bis (3-bromo-4-hydroxyphenyl) propane, 2,2- (3,5-dichloro-4-hydroxyphenyl) propane, 2,2-bis (3-phenyl-4-hydroxyphenyl) propane, 2,2-bis (3-cyclohexyl-4-hydroxyphenyl) propane, , 1-bis (4-hydroxyphenyl) -1-phenylethane, bis (4-hydroxyphenyl) diphenylmethane, 2,2-bis (4-hydroxyphenyl) -1,1,1-trichloropropane, 2,2- Bis (4-hydroxyphenyl) -1,1,1,3,3,3-hexachloropropane, 2,2-bis (4-hydroxyphenyl) -1,1,1,3,3,3-hexafluoropropane Bis (hydroxyaryl) alkanes exemplified by the above; 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4-hydroxy) Roxyphenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane and the like bis (hydroxyaryl) cycloalkanes; 9,9-bis (4-hydroxyphenyl) Cardo structure-containing bisphenols exemplified by fluorene, 9,9-bis (4-hydroxy-3-methylphenyl) fluorene; 4,4′-dihydroxydiphenyl ether, 4,4′-dihydroxy-3,3′-dimethyl Dihydroxy diaryl ethers exemplified by diphenyl ether and the like; dihydroxy diaryl sulfides exemplified by 4,4′-dihydroxydiphenyl sulfide, 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfide and the like; 4,4′- Dihydroxydiphenyl sulfoxide, Dihydroxydiaryl sulfoxides exemplified by 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfoxide and the like; 4,4′-dihydroxydiphenyl sulfone, 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfone and the like Exemplified dihydroxydiaryl sulfones; hydroquinone, resorcin, 4,4′-dihydroxydiphenyl and the like.

Among these, bis (4-hydroxyphenyl) alkanes are preferable, and 2,2-bis (4-hydroxyphenyl) propane [= bisphenol A] is particularly preferable from the viewpoint of impact resistance.
These aromatic dihydroxy compounds may be used alone or in combination of two or more.

  As the carbonate precursor to be reacted with the aromatic dihydroxy compound, carbonyl halide, carbonate ester, haloformate, etc. are used. Specifically, phosgene; diaryl carbonates such as diphenyl carbonate, ditolyl carbonate; dimethyl carbonate, diethyl carbonate, etc. Dialkyl carbonates; dihaloformates of dihydric phenols and the like. These carbonate precursors may also be used alone or in combination of two or more.

  The (A) aromatic polycarbonate resin may be a branched aromatic polycarbonate resin obtained by copolymerizing a trifunctional or higher polyfunctional aromatic compound. Examples of the trifunctional or higher polyfunctional aromatic compound include phloroglucin, 4,6-dimethyl-2,4,6-tri (4-hydroxyphenyl) heptene-2, 4,6-dimethyl-2,4,6- Tri (4-hydroxyphenyl) heptane, 2,6-dimethyl-2,4,6-tri (4-hydroxyphenyl) heptene-3, 1,3,5-tri (4-hydroxyphenyl) benzene, 1, Polyhydroxy compounds exemplified by 1,1-tri (4-hydroxyphenyl) ethane or the like, or 3,3-bis (4-hydroxyaryl) oxindole (= isatin bisphenol), 5-chloroisatin, 5, Examples thereof include 7-dichloroisatin and 5-bromoisatin. Among these, 1,1,1-tri (4-hydroxyphenyl) ethane is preferable. The polyfunctional aromatic compound can be used by replacing a part of the aromatic dihydroxy compound, and the amount used is preferably in the range of 0.01 to 10 mol% with respect to the aromatic dihydroxy compound. The range of .1 to 2 mol% is more preferable.

  In the reaction by the interfacial polymerization method, the pH is usually kept at 9 or higher in the presence of an organic solvent inert to the reaction and an aqueous alkaline solution, and the aromatic dihydroxy compound and, if necessary, a molecular weight modifier (end terminator) and Use an antioxidant to prevent oxidation of aromatic dihydroxy compounds, react with phosgene, add a polymerization catalyst such as tertiary amine or quaternary ammonium salt, and obtain polycarbonate by interfacial polymerization . The addition of the molecular weight regulator is not particularly limited as long as it is from the time of phosgenation to the start of the polymerization reaction. In addition, reaction temperature is 0-40 degreeC, for example, and reaction time is several minutes (for example, 10 minutes)-several hours (for example, 6 hours), for example.

  Here, examples of the organic solvent inert to the reaction include chlorinated hydrocarbons such as dichloromethane, 1,2-dichloroethane, chloroform, monochlorobenzene and dichlorobenzene, and aromatic hydrocarbons such as benzene, toluene and xylene. . Examples of the alkali compound used in the alkaline aqueous solution include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide.

  Examples of the molecular weight regulator include compounds having a monovalent phenolic hydroxyl group. Examples of the compound having a monovalent phenolic hydroxyl group include m-methylphenol, p-methylphenol, m-propylphenol, p-propylphenol, p-tert-butylphenol and p-long chain alkyl-substituted phenol. The amount of the molecular weight regulator used is preferably 50 to 0.5 mol, more preferably 30 to 1 mol, per 100 mol of the aromatic dihydroxy compound.

  As a polymerization catalyst, tertiary amines such as trimethylamine, triethylamine, tributylamine, tripropylamine, trihexylamine and pyridine: quaternary ammonium salts such as trimethylbenzylammonium chloride, tetramethylammonium chloride, triethylbenzylammonium chloride Etc.

  The reaction by the melt transesterification method is, for example, a transesterification reaction between a carbonic acid diester and an aromatic dihydroxy compound. Examples of the carbonic acid diester include dialkyl carbonate compounds such as dimethyl carbonate, diethyl carbonate and di-tert-butyl carbonate, and substituted diphenyl carbonates such as diphenyl carbonate and ditolyl carbonate. The carbonic acid diester is preferably diphenyl carbonate or substituted diphenyl carbonate, more preferably diphenyl carbonate.

  Generally, a polycarbonate having a desired molecular weight and a terminal hydroxyl group amount can be obtained by adjusting the mixing ratio of the carbonic acid diester and the aromatic dihydroxy compound or adjusting the degree of vacuum during the reaction. As a more aggressive method, an adjustment method in which a terminal terminator is added separately during the reaction is also well known. In this case, examples of the terminal terminator include monohydric phenols, monovalent carboxylic acids, and carbonic acid diesters. The amount of terminal hydroxyl groups greatly affects the thermal stability, hydrolysis stability, color tone, etc. of the product polycarbonate. Although it depends on the application, in order to have practical physical properties, it is preferably 1,000 ppm or less, more preferably 700 ppm or less.

  Moreover, in the polycarbonate manufactured by the transesterification method, it is preferable that the amount of terminal hydroxyl groups is 100 ppm or more. By setting it as the amount of such terminal hydroxyl groups, the fall of molecular weight can be suppressed and a color tone can also be made more favorable. Accordingly, it is preferable to use an equimolar amount or more of the carbonic acid diester, and more preferably 1.01 to 1.30 mol, per 1 mol of the aromatic dihydroxy compound.

  When producing a polycarbonate by the transesterification method, a transesterification catalyst is usually used. The transesterification catalyst is not particularly limited, but an alkali metal compound and / or an alkaline earth metal compound is preferable. In addition, a basic compound such as a basic boron compound, a basic phosphorus compound, a basic ammonium compound, or an amine compound can be used in combination. As the transesterification reaction using the above raw materials, the reaction is carried out at a temperature of 100 to 320 ° C., and finally a melt polycondensation reaction is performed under reduced pressure of 2 mmHg or less while removing by-products such as aromatic hydroxy compounds. The method of performing is illustrated.

The melt polycondensation can be carried out batchwise or continuously, but is preferably carried out continuously in view of the stability of the resin composition of the present invention. As the catalyst deactivator in the transesterification polycarbonate, it is preferable to use a compound that neutralizes the catalyst, for example, a sulfur-containing acidic compound or a derivative formed therefrom. The compound that neutralizes such a catalyst is preferably added in an amount of 0.5 to 10 equivalents, more preferably 1 to 5 equivalents, relative to the alkali metal contained in the catalyst. In addition, the compound that neutralizes such a catalyst is preferably added in an amount of 1 to 100 ppm, more preferably 1 to 20 ppm, based on the polycarbonate.

As for the molecular weight of the aromatic polycarbonate resin used in the present invention, the viscosity average molecular weight [Mv] converted from the solution viscosity is from 10,000 to 25,000. By setting the viscosity average molecular weight of the aromatic polycarbonate to 10,000 or more, the mechanical strength tends to be further improved, and it is more preferable when used for applications requiring high mechanical strength. On the other hand, when the viscosity average molecular weight is 25000 or less, it tends to be possible to further improve the decrease in fluidity, which is more preferable from the viewpoint of easy molding processability.
The viscosity average molecular weight is preferably 12,000 or more, particularly preferably 14,000 or more, and the upper limit is preferably 24,000 or less, particularly preferably 23,000 or less. Moreover, you may mix 2 or more types of aromatic polycarbonate resin from which a viscosity average molecular weight differs. Of course, you may mix the aromatic polycarbonate resin whose viscosity average molecular weight is outside the said suitable range.

Here, the viscosity average molecular weight [Mv] is obtained by using methylene chloride as a solvent and obtaining an intrinsic viscosity [η] (unit: dl / g) at a temperature of 20 ° C. using an Ubbelohde viscometer. , Η = 1.23 × 10 ⁻⁴ M ^0.83 . Here, the intrinsic viscosity [η] is a value calculated from the following equation by measuring the specific viscosity [η _sp ] at each solution concentration [C] (g / dl).

  Further, in order to improve the appearance of the molded product and the fluidity, the (A) aromatic polycarbonate resin in the present invention may contain an aromatic polycarbonate oligomer. The aromatic polycarbonate oligomer has a viscosity average molecular weight [Mv] of preferably 1500 to 9500, more preferably 2000 to 9000. The aromatic polycarbonate oligomer is preferably used in the range of 30% by weight or less of the component A.

  Furthermore, the (A) aromatic polycarbonate resin in the present invention may use not only a virgin raw material but also an aromatic polycarbonate resin regenerated from a used product, that is, a so-called material recycled aromatic polycarbonate resin. Used products include optical recording media such as optical disks, light guide plates, vehicle window glass, vehicle headlamp lenses, windshields, and other vehicle transparent members, water bottle containers, glasses lenses, soundproof walls, glass windows, waves, etc. A building member such as a plate is preferred. Also, non-conforming products, pulverized products obtained from sprues, runners, etc., or pellets obtained by melting them can be used. The regenerated aromatic polycarbonate resin is preferably 80% by weight or less, more preferably 50% by weight or less of the component A.

The alicyclic polyester resin according to the present invention is a polyester resin obtained by reacting a dicarboxylic acid component mainly composed of 1,4-cyclohexanedicarboxylic acid with a diol component.
In other words, the alicyclic polyester resin according to the present invention is obtained by using a dicarboxylic acid component as a raw material, so that the alkyl ester terminal is different from the case of using a dicarboxylic acid ester as a raw material. The alicyclic polyester resin is small, that is, the ratio of the alkyl ester terminal to the total terminal of the polyester is 5 mol% or less, preferably 1 mol% or less.

[2] Alicyclic polyester resin (component B)
The B component in the present invention is (B) an alicyclic polyester resin. For example, a dicarboxylic acid component, a diol component, and optionally a small amount of other components are esterified or transesterified, It is formed by polycondensation reaction. The dicarboxylic acid component is mainly composed of an alicyclic dicarboxylic acid or an ester-forming derivative thereof. Moreover, a diol component has alicyclic diol as a main component.
Here, the “main component” means, for example, that each occupies 80 mol% or more with respect to the dicarboxylic acid component or the diol component.

  The alicyclic dicarboxylic acid or an ester-forming derivative thereof is not particularly limited as long as two carboxyl groups are bonded to the alicyclic structure. Specifically, for example, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 1,4-decahydronaphthalenedicarboxylic acid, 1,5-decahydronaphthalenedicarboxylic acid, Examples include 2,6-decahydronaphthalenedicarboxylic acid, 2,7-decahydronaphthalenedicarboxylic acid, and ester-forming derivatives thereof.

  Among these, alicyclic dicarboxylic acids having 6 to 12 carbon atoms or ester-forming derivatives thereof are preferable, 1,4-cyclohexanedicarboxylic acid or ester-forming derivatives thereof are more preferable, and 1,4-cyclohexanedicarboxylic acid is further preferable. An alicyclic dicarboxylic acid such as 1,4-cyclohexanedicarboxylic acid is preferable because it is less expensive than an ester-forming derivative.

  When 1,4-cyclohexanedicarboxylic acid is employed, the ratio of the trans isomer to the cis isomer is preferably 80/20 to 100/0, more preferably 85/15 to 100/0, even more preferably. Is 90/10 to 100/0, particularly preferably 95/5 to 100/0. By setting it as such a range, the heat resistance of the obtained alicyclic polyester resin can be made more favorable.

The dicarboxylic acid component of the (B) alicyclic polyester resin in the present invention contains alicyclic dicarboxylic acid or an ester-forming derivative thereof at 80 mol% or more, preferably 90 mol% or more, based on the total dicarboxylic acid component. To do. Other dicarboxylic acid components include aromatic dicarboxylic acids and aliphatic dicarboxylic acids. Specifically, terephthalic acid, phthalic acid, isophthalic acid, 1,4-phenylenedioxydicarboxylic acid, 1,3-phenylenedioxydiacetic acid, 4,4-diphenyldicarboxylic acid, 4,4′-diphenyletherdicarboxylic acid 4,4-diphenyl ketone dicarboxylic acid, 4,4′-diphenoxyethanedicarboxylic acid, 4,4-diphenylsulfone dicarboxylic acid, aromatic dicarboxylic acid such as 2,6-naphthalenedicarboxylic acid, succinic acid, glutamic acid, Examples thereof include adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecadicarboxylic acid and dodecadicarboxylic acid, and alkyl esters or halides having 1 to 4 carbon atoms.

The alicyclic diol component is not particularly limited as long as two hydroxyl groups are bonded to the alicyclic structure, but the alicyclic diol has two hydroxyl groups bonded to a 5-membered or 6-membered ring. It is preferable that By using a 5-membered or 6-membered alicyclic diol as the alicyclic diol, the heat resistance of the resulting polyester resin can be increased.
Examples of such alicyclic diols include 1,2-cyclopentanedimethanol, 1,3-cyclopentanedimethanol, bis (hydroxymethyl) tricyclo, [5.2.
1.0] 5-membered ring diol such as decane, 1,2-cyclohexanediol, 1,3-cyclohexanediol, 1,4-cyclohexanediol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, , 4-cyclohexanedimethanol, 6-membered ring diols such as 2,2-bis (4-hydroxycyclohexyl) -propane, and the like. Among these, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol and 1,4-cyclohexanedimethanol are preferable, and 1,4-cyclohexanedimethanol is more preferable.
1,4-Cyclohexanedimethanol is highly reactive because the methylol group is in the para position, it is easy to obtain a high polymerization degree polyester, a polyester resin having a high glass transition temperature is obtained, and it is an industrial product and is available. Has the advantage of being easy. The ratio of 1,4-cyclohexanedimethanol trans isomer to cis isomer is preferably in the range of 60/40 to 100/0.

  In the present invention, the diol component contains an alicyclic diol as described above in an amount of 80 mol% or more, preferably 90 mol% or more based on the total diol component. Examples of other diol components include aliphatic diols and aromatic diols. When the alicyclic diol is less than 80 mol%, the compatibility with the aromatic polycarbonate resin is inferior, the transparency is lowered, and the heat resistance may be inferior.

Specific examples of other diol components include aliphatic diols such as ethylene glycol, propylene glycol, butanediol, pentanediol, and hexanediol, and xylylene glycol, 4,4-dihydroxybiphenyl, 2,2-bis (4 '−
And aromatic diols such as hydroxyphenyl) propane, bis (4-hydroxyphenyl) sulfone and bis (4-β-hydroxyethoxyphenyl) sulfonic acid.

Furthermore, the (B) alicyclic polyester resin in the present invention may contain a small amount of a copolymer component other than the diol component and the dicarboxylic acid component. Examples of such copolymer components include glycolic acid, p-hydroxybenzoic acid, hydroxycarboxylic acids such as p-β-hydroxyethoxybenzoic acid, alkoxycarboxylic acids, stearyl alcohol, benzyl alcohol, stearic acid, behenic acid, benzoic acid. Monofunctional components such as tert-butylbenzoic acid and benzoylbenzoic acid, tricarballylic acid, trimellitic acid, trimesic acid, pyromellitic acid, naphthalenetetracarboxylic acid, gallic acid, trimethylolethane, trimethylolpropane, glycerol, penta Trifunctional or higher polyfunctional components such as erythritol and sugar ester may be used.
These components are preferably 10 mol% or less of the B component.

  In the present invention, as a use ratio in the esterification reaction or transesterification reaction between the dicarboxylic acid component and the diol component, the total amount of the diol component is 1 to 2 times in molar ratio to the total amount of the dicarboxylic acid component. Is preferred. In particular, when the main component is a diol component having a high boiling point such as 1,4-cyclohexanedimethanol, the molar ratio is preferably 1 to 1.2 times.

In the present invention, it is preferable to use a catalyst in order to obtain a sufficient reaction rate in the esterification or transesterification reaction and the polycondensation reaction. Such a catalyst is not particularly limited as long as it is a catalyst usually used for esterification or transesterification, and widely known catalysts can be employed. Specific examples include titanium compounds, germanium compounds, antimony compounds, and tin compounds. Of these, titanium compounds are preferred because of their high activity in both the esterification or transesterification reaction and the subsequent polycondensation reaction. Examples of such titanium compounds include tetra-n-propyl titanate, tetra-iso-propyl titanate, tetra-n-butyl titanate, and hydrolysates of these organic titanates. These may be used alone or in combination of two or more. Moreover, you may combine with a magnesium compound, a phosphorus compound, etc. as needed. The amount of the catalyst used is preferably 1 to 2000 ppm, more preferably 10 to 1000 ppm, still more preferably 50 to 1000 ppm, and particularly preferably 100 to 1000 ppm with respect to the (B) alicyclic polyester resin to be produced.

The esterification reaction or transesterification reaction between the dicarboxylic acid component and the diol component is usually from 150 ° C to 230 ° C, preferably from 180 ° C to 220 ° C, usually from 10 minutes to 10 hours,
Preferably it is performed for 30 minutes to 5 hours.
After the esterification reaction, the reaction solution is usually transferred to a polycondensation tank equipped with a stirrer, a distilling tube and a vacuum addition apparatus. The esterification reaction tank is equipped with a vacuum addition apparatus, and the esterification reaction and A polycondensation reaction can also be performed.

After the esterification is completed, a polycondensation catalyst or the like is added to the reaction solution as necessary, and a polycondensation reaction is performed while gradually reducing the pressure in the reaction vessel. When the polymerization catalyst is added, the amount thereof is a total amount with the esterification reaction or transesterification reaction catalyst, and is a total amount of 50 to 2000 ppm, preferably 100 to 1000 ppm with respect to the polyester that is usually produced.
The polycondensation is carried out at an esterification reaction completion temperature of not higher than 300 ° C., preferably not higher than 265 ° C., usually for 10 minutes to 10 hours, preferably 30 minutes to 5 hours. If the temperature is too high, the polymerization reaction tends not to proceed because thermal decomposition occurs during the polymerization reaction. The pressure in the tank is a pressure that finally becomes 1 KPa or less from normal pressure, and is preferably 0.5 KPa or less.

The intrinsic viscosity of the (B) alicyclic polyester resin in the present invention is preferably 0.4 to 1.5 dl / g, more preferably 0.5 to 1.3 dl / g, and even more preferably 0.6 to 1.5 dl / g. In particular, it is preferably 0.7 to 1.4 dl / g. By setting the intrinsic viscosity to 0.4 dl / g or more, the mechanical strength is further improved, and by setting the intrinsic viscosity to 1.5 dl / g or less, the fluidity is further improved and molding becomes more preferable. Furthermore, the obtained polyester resin may be subjected to solid phase polymerization as necessary to have a higher intrinsic viscosity.
Here, intrinsic viscosity is calculated | required by measuring at 30 degreeC using a Ubbelohde viscometer by making a phenol / tetrachloroethane (weight ratio 1/1) liquid mixture into a solvent.

  The terminal carboxylic acid concentration of the (B) alicyclic polyester resin in the present invention is preferably 70 μeq / g or less, particularly 40 μeq / g or less, more preferably 30 μeq / g or less, and particularly preferably 10 μeq / g or less. preferable. It is preferable for the terminal carboxylic acid concentration to be 70 μeq / g or less because the moisture and heat resistance of the resin composition of the present invention tends to be further improved.

  The terminal acid value is controlled by, for example, controlling the use ratio of 1,4-cyclohexanedicarboxylic acid and 1,4-cyclohexanedimethanol, which are raw materials, or alkylene diol, This can be carried out by using an alkylene diol having 2 to 10 carbon atoms in combination.

Moreover, in order to set the terminal acid value of the alicyclic polyester resin according to the present invention to 40 μeq / g, for example, a dicarboxylic acid component in which 90 mol% or more is 1,4-cyclohexanedicarboxylic acid, and 90 mol% or more When the diol component is 1,4-cyclohexanedimethanol, the ratio of the diol component to 1 mol of the dicarboxylic acid component is 1.02 to 1.2 mol, more preferably 1.02 to 1.1 mol. To do.
Further, for example, a dicarboxylic acid component in which 90 mol% or more is 1,4-cyclohexanedicarboxylic acid, 80 to 99.5 mol% is 1,4-cyclohexanedimethanol, and 0.5 to 20 mol% is carbon number. In the case of using 2 to 10 alkylene diols, a method of using 1.02 to 1.2 mol, more preferably 1.02 to 1.1 mol of the diol component with respect to 1 mol of the dicarboxylic acid component can be mentioned.

  The melting point of the (B) alicyclic polyester resin in the present invention is, for example, an alicyclic ring containing 1,4-cyclohexanedicarboxylic acid as a main component as a dicarboxylic acid component and 1,4-cyclohexanedimethanol as a main component as a diol component. In the case of a formula polyester resin, it is preferably 200 to 250 ° C, more preferably 210 to 230 ° C, still more preferably 215 to 230 ° C.

In the alicyclic polyester resin used in the present invention, when the Yellowness Index (YI) is too high to recognize yellow coloring even when visually observed, naturally, when used for a light guide plate made of the resin composition of the present invention, The transmitted image may turn yellow, making it difficult to reproduce the original image. Therefore, it is desirable that YI is as low as possible.
If the light transmittance of a 2 mm thick molded plate molded using the alicyclic polyester resin according to the present invention is too low, the light guide plate may not transmit light sufficiently and the screen may become dark. Therefore, the light transmittance is usually 87% or more, preferably 87.5% or more, and more preferably 88% or more.

As 1,4-cyclohexanedicarboxylic acid, which is a raw material for the alicyclic polyester resin used in the present invention, a large light transmittance at a wavelength of 340 nm is preferable from the viewpoint of the light transmittance of the obtained alicyclic polyester resin. . When this light transmittance is too low, the YI value of the resulting alicyclic polyester resin tends to increase, and the light transmittance of the alicyclic polyester resin tends to decrease. Specifically, the light transmittance measured by the following method (hereinafter sometimes abbreviated as T-340) is 85% or more, and preferably 87% or more.
This T-340 was measured by using a spectrophotophotometer to put a 2N potassium hydroxide solution into a quartz cell having an optical path length of 10 mm, zero correction, and then adding 1 to 50 ml of 2N potassium hydroxide solution. A solution obtained by dissolving 5.0 g of 4-cyclohexanedicarboxylic acid in a quartz cell having an optical path length of 10 mm is a light transmittance at a wavelength of 340 nm measured for the solution.

  In addition, in the raw material of the alicyclic polyester resin used in the present invention, as a method for producing a raw material 1,4-cyclohexanedicarboxylic acid having a trans isomer of 90 mol% or more, for example, a cis isomer of 1,4-cyclohexanedicarboxylic acid, or A thermal isomerization method of a mixture of cis and trans isomers is exemplified. In the known crystallization method using the difference in solubility between water and the cis isomer and the trans isomer, the obtained 1,4-cyclohexanedicarboxylic acid has a low T-340, and the resulting alicyclic polyester resin has a light transmittance. Is insufficient. Therefore, the thermal isomerization method is preferred from the viewpoint that it is preferable to use 1,4-cyclohexanedicarboxylic acid having a trans isomer ratio of 90 mol% or more and T-340 of 85% or more.

  The thermal isomerization is carried out by adding a mixture of cis-1,4-cyclohexanedicarboxylic acid and trans-1,4-cyclohexanedicarboxylic acid or cis-1,4-cyclohexanedicarboxylic acid at 180 ° C. in an inert atmosphere. The heat treatment can be performed in the temperature range below the melting point of trans-1,4-cyclohexanedicarboxylic acid. The melting point of trans-1,4-cyclohexanedicarboxylic acid in the present invention refers to the melting point of trans-1,4-cyclohexanedicarboxylic acid under the actual isomerization reaction conditions.

The thermal isomerization reaction pressure can be carried out under reduced pressure, normal pressure or increased pressure, but is usually 1.3 to 950 kPa in view of the ease of operation.
Furthermore, in order to make T-340 of 1,4-cyclohexanedicarboxylic acid 85% or more, a mixture of cis / trans-1,4-cyclohexanedicarboxylic acid or cis-1,4-cyclohexanedicarboxylic acid is heat-treated. It is preferable to adjust the inert atmosphere at the time of oxygen concentration in the reaction system to 4000 ppm or less, preferably 2000 ppm or less, more preferably 1000 ppm or less. If the oxygen concentration in the system is higher than 4000 ppm, T-340 tends to be less than 85%.

  In order to efficiently obtain trans-1,4-cyclohexanedicarboxylic acid produced by thermal isomerization, trans-1,4-cyclohexanedicarboxylic acid is melted in the melted cis-1,4-cyclohexanedicarboxylic acid while maintaining the temperature range. There is a method in which cyclohexanedicarboxylic acid is precipitated and removed. In addition, what is necessary is just to obtain the method of obtaining the mixture of cis-form and trans-form 1,4-cyclohexanedicarboxylic acid used as the raw material in a thermal isomerization method by a conventionally well-known arbitrary method. For example, there is a method of liquid phase nuclear hydrogenation of terephthalic acid in the presence of solvent, hydrogen and hydrogenation catalyst, and a method of acid precipitation after liquid phase nuclear hydrogenation of sodium terephthalate in the presence of water, hydrogen and hydrogenation catalyst. Can be mentioned.

Further, the alicyclic polyester resin used in the present invention may be made into a pellet and then subjected to solid phase polymerization as necessary to have a higher intrinsic viscosity.
The alicyclic polyester resin used in the present invention is preferably one in which 80 mol% or more of diol units is 1,4-cyclohexanedimethanol from the viewpoint of heat resistance of the polyester resin.
Also, 80 mol% or more and 99.5 mol% or less of diol units are 1,4-cyclohexanedimethanol units, and 0.5 mol% or more and 20 mol% or less are alkylene diol units having 2 to 10 carbon atoms. Among them, those in which 1,4-cyclohexanedimethanol units are 90 mol% or more and 99.5 mol% or less, and alkylene diol units having 2 to 10 carbon atoms are 0.5 mol% or more and 10 mol% or less. It is preferable because of its high hydrolysis resistance.

[3] Phosphorus compound (component C)
The compound as component C in the present invention (hereinafter sometimes collectively referred to as a phosphorus compound) is at least one selected from the group consisting of compounds represented by the following general formulas (I) to (VI). A compound. Specifically, the phosphate represented by the general formula (I), the phosphite represented by the general formula (II), and the organic phosphate represented by the general formula (III) to the general formula (VI) It is at least one compound selected from the group consisting of metal salts.

[3-1]
The phosphate ester used as the component C of the present invention is represented by the following general formula (I).
Formula (I)
O = P (OH) _n (OR) _3-n (I)
(In general formula (I), R is an alkyl group or an aryl group, and may be the same or different. N represents an integer of 0 to 2.)

In the general formula (I), R is preferably an alkyl group having 1 to 30 carbon atoms or an aryl group having 6 to 30 carbon atoms, more preferably an alkyl group having 2 to 25 carbon atoms, a phenyl group, Nonylphenyl group, stearylphenyl group, 2,4-di-tert-butylphenyl group, 2,4-di-tert-butyl-methylphenyl group, and tolyl group.
From the viewpoint of further improving the transparency, brightness, and hue, a phosphate ester represented by the following general formula (II) is preferable.

Formula (I-I)
O = P (OH) _{n ′} (OR ″) _{3-n ′} (II)
(In general formula (V), R ″ is an alkyl group having 2 to 25 carbon atoms, which may be the same or different. N ′ is 1 or 2.)
Here, as the alkyl group, an octyl group, a 2-ethylhexyl group, an isooctyl group,
Nonyl group, isononyl group, decyl group, isodecyl group, dodecyl group, tridecyl group, isotridecyl group, tetradecyl group, hexadecyl group, octadecyl group and the like can be mentioned.

[3-2]
The phosphite used as the C component of the present invention is represented by the following general formula (II).

Formula (II)

（一般式（ＩＩ）中、Ｒ'は、アルキル基またはアリール基であり、それぞれ同一であっ
ても異なっていてもよい。）

(In general formula (II), R ′ is an alkyl group or an aryl group, and each may be the same or different.)

In general formula (II), when R ′ is an alkyl group, an alkyl group having 1 to 30 carbon atoms is preferable, and when R ′ is an aryl group, an aryl group having 6 to 30 carbon atoms is preferable.
Preferable specific examples of the phosphite represented by the general formula (II) include distearyl pentaerythritol diphosphite, dinonylpentaerythritol diphosphite, bisnonylphenylpentaerythritol diphosphite, bis (2,4 -Di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4) -Ethylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-isopropylphenyl) pentaerythritol diphosphite, bis (2,4-dicumylphenyl) pentaerythritol diphosphite, etc. Can be mentioned.

  Among these, distearyl pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-) are more preferable. Methylphenyl) pentaerythritol diphosphite, more preferably bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-methylphenyl). ) Pentaerythritol diphosphite.

[3-3]
The organophosphate metal salt used as the C component of the present invention is represented by the following general formula (III) to general formula (VI) (hereinafter referred to as an organophosphate metal salt represented by these general formulas, (In order, they may be referred to as (D1 component) to (D4 component)).

Formula (III)

（一般式（ＩＩＩ）中、Ｒ¹〜Ｒ⁴はアルキル基またはアリール基であり、それぞれ同一であっても異なっていてもよい。Ｍはアルカリ土類金属および亜鉛より選ばれる金属を表す。）

(In the general formula (III), R ^{1 to} R ⁴ are alkyl groups or aryl groups, which may be the same or different. M represents a metal selected from alkaline earth metals and zinc.)

Formula (IV)

（一般式（ＩＶ）中、Ｒ⁵はアルキル基またはアリール基であり、Ｍはアルカリ土類金属
および亜鉛より選ばれる金属を表す。）

(In general formula (IV), R ⁵ represents an alkyl group or an aryl group, and M represents a metal selected from alkaline earth metals and zinc.)

General formula (V)

（一般式（Ｖ）中、Ｒ⁶〜Ｒ¹¹はアルキル基またはアリール基であり、それぞれ同一であ
っても異なっていてもよい。Ｍ'は３価の金属イオンとなる金属原子を表す。）

(In the general formula (V), R ^{6 to} R ¹¹ are alkyl groups or aryl groups, which may be the same or different. M ′ represents a metal atom that becomes a trivalent metal ion.)

Formula (VI)

（一般式（ＶＩ）中、Ｒ¹²〜Ｒ¹⁴は、アルキル基またはアリール基であり、それぞれ同一であっても異なっていてもよい。Ｍ'は３価の金属イオンとなる金属原子を表し、２つの
Ｍ'はそれぞれ同一であっても異なっていてもよい。）

(In the general formula (VI), R ^{12 to} R ¹⁴ are alkyl groups or aryl groups, which may be the same or different. M ′ represents a metal atom that becomes a trivalent metal ion; Two M's may be the same or different.

In the general formulas (III) to (VI), R ^{1 to} R ¹⁴ are preferably each an alkyl group having 1 to 30 carbon atoms or an aryl group having 6 to 30 carbon atoms, and more preferably, C2-C25 alkyl group, phenyl group, nonylphenyl group, stearylphenyl group, 2,4-di-tert-butylphenyl group, 2,4-di-tert-butyl-methylphenyl group or tolyl group, respectively It is.

From the viewpoint of further improving transparency, luminance, and hue, R ^{1 to} R ¹⁴ each have 2 carbon atoms.
It is preferably an alkyl group of ˜25, octyl group, 2-ethylhexyl group, isooctyl group, nonyl group, isononyl group, decyl group, isodecyl group, dodecyl group, tridecyl group, isotridecyl group, tetradecyl group, hexadecyl group, octadecyl group Groups are more preferred.
In the general formulas (III) to (VI), M is preferably zinc. In the general formulas (III) to (VI), M ′ is preferably aluminum.

Moreover, the organophosphate metal salt represented by the general formula (III) to the general formula (VI) may be used singly or in combination of two or more.
Furthermore, among the above general formulas (III) to (VI), it is particularly preferable to use an organophosphate metal salt represented by the general formula (III) and / or (IV). In the general formulas (III) and (IV), M is preferably zinc. Further, in general formulas (III) and (IV), R ^{1 to} R ⁵ are more preferably alkyl groups having 2 to 25 carbon atoms.
In particular, the ratio of the organic phosphate metal salt represented by the general formula (III) and the general formula (IV) is preferably 1/9 to 9/1 by weight.

  Particularly preferred organophosphate metal salts include a zinc salt of monostearyl acid phosphate and a zinc salt of distearyl acid phosphate, a mixture of aluminum salt of monostearyl acid phosphate and aluminum salt of distearyl acid phosphate. Can be mentioned. Such a preferable organophosphate metal salt is commercially available as LBT-1830 manufactured by Sakai Chemical Industry or LBT-1813 manufactured by Sakai Chemical Industry.

  In the phosphorus compound used as the C component of the present invention, one kind may be used alone, or two or more kinds may be used in combination. When used alone, those represented by the above-described general formula (I) are preferable, but among them, it is preferable to use the compounds represented by the above-described general formulas (I) to (VI) in combination. The combination used in combination may be appropriately selected and determined according to various properties required for the light guide plate of the present invention. Among them, the phosphate ester represented by the general formula (I), the general formula ( II) a phosphite ester represented by formula (II), and at least one phosphorous compound selected from the group consisting of organophosphate metal salts represented by formulas (III) to (VI) Therefore, both brightness and hue are improved, and the balance of impact resistance, heat and humidity resistance, and residence heat stability is sufficient, which is preferable.

  In the present invention, the mixing ratio of the A component and the B component is 50 to 95 parts by weight for the A component and 5 to 50 parts by weight for the B component in a total of 100 parts by weight of the A and B components. By setting the A component to 50 parts by weight or more, heat resistance and mechanical strength can be made sufficient, but if it is too much, moldability, transferability, and luminance may be lowered. Accordingly, in the present invention, the A component in the total 100 parts by weight of the A component and the B component is preferably 57 to 95 parts by weight, and the B component is preferably 5 to 43 parts by weight.

Content of C component in this invention is 0.001-0.3 weight part with respect to a total of 100 weight part of A component and B component. If the content of the component C is too large or conversely too small, the heat stability, brightness, and hue may be lowered.
Among them, in the present invention, the phosphoric acid ester represented by the general formula (I) and / or the phosphorous acid ester represented by the general formula (II) with respect to a total of 100 parts by weight of the component A and the component B 0.001 to 0.3 parts by weight of at least one selected from the group consisting of: and at least one selected from the group consisting of organophosphate metal salts represented by general formula (III) to general formula (VI) It is preferable to contain 0.001-0.3 weight part.

[4] Polyorganosiloxane (component D)
The resin composition of the present invention must contain the above-described components A to C, but further contains polyorganosiloxane for the purpose of further improving the transparency, luminance, and hue of the resin composition. be able to.

The polyorganosiloxane in the present invention has a phenyl group at least in the side chain. This preferably has a branched siloxane structure and may be a single compound or a mixture. In the case of a mixture, a combination of a polyorganosiloxane having a phenyl group at least in the side chain and a polyorganosiloxane having at least a branched siloxane structure is also preferred.
In addition, the D component in the present invention has a kinematic viscosity at 25 ° C. of 1 to 200 cSt, preferably 5 to 100 cSt, and more preferably 10 to 50 cSt. By setting the kinematic viscosity to 1 cSt or more, the amount of gas generation at the time of molding can be suppressed, and the possibility of occurrence of molding defects due to gas, for example, unfilling, gas burnout, and transfer defects, can be further reduced. On the other hand, by setting the kinematic viscosity to 200 cSt or less, the effect of improving the transparency and / or hue of the resin composition of the present invention becomes more remarkable. The polyorganosiloxane used in the present invention can be easily obtained by a conventional organic reaction.

  The content of component D in the present invention is preferably 0.01 to 1 part by weight, more preferably 0.03 to 0.8 part by weight, with respect to 100 parts by weight of the total of component A and component B. By making the content of the D component 0.01 parts by weight or more, it is more effective in improving the transparency, brightness, and hue of the resin composition. By making it 1 part by weight or less, molding defects due to gas, for example, The possibility of occurrence of unfilling, gas burnout, transfer failure, etc. can be further reduced.

  The aromatic polycarbonate-alicyclic polyester resin composition used in the present invention contains, in addition to the above-mentioned components A to D, other various resin additives as long as the purpose of the present invention is not impaired. May be. For example, various resin additives include polyorganosiloxane, antioxidant, mold release agent, dye / pigment, weather resistance improver, antistatic agent, antifogging agent, lubricant / antiblocking agent, flame retardant, fluidity improver In addition, one or more plasticizers, dispersants, antibacterial agents, fillers / fillers, and the like may be added and contained.

An antioxidant preferably blended in the aromatic polycarbonate-alicyclic polyester resin composition includes a hindered phenol-based antioxidant. Specific examples include pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert-butyl-4-hydroxy Phenyl) propionate, thiodiethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], N, N′-hexane-1,6
-Diylbis [3- (3,5-di-tert-butyl-4-hydroxyphenylpropionamide), 2,4-dimethyl-6- (1-methylpentadecyl) phenol, diethyl [[3,5-bis ( 1,1-dimethylethyl) -4-hydroxyphenyl] methyl] phosphoate, 3,3 ′, 3 ″, 5,5 ′, 5 ″ -hexa-tert-butyl-a, a ′, a ″- (Mesitylene-2,4,6-triyl) tri-p-cresol, 4,6-bis (octylthiomethyl) -o-cresol, ethylenebis (oxyethylene) bis [3- (5-tert-butyl-4 -Hydroxy-m-tolyl) propionate], hexamethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 1,3,5-tris (3,5-di) tert-butyl-4-hydroxybenzyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -trione, 2,6-di-tert-butyl-4- (4,6- And bis (octylthio) -1,3,5-triazin-2-ylamino) phenol. Of the above, in particular pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert-butyl-4- Hydroxyphenyl) propionate is preferred. These two phenolic antioxidants are commercially available under the names Irganox 1010 and Irganox 1076 from Ciba Specialty Chemicals.

  The blending ratio of the phenolic antioxidant is preferably 0.01 to 1 part by weight with respect to 100 parts by weight of the total of the A component and the B component. If the blending amount of the phenolic antioxidant is less than 0.01 parts by weight, the effect as an antioxidant is insufficient, and even if it exceeds 1 part by weight, no further effect as an antioxidant can be obtained.

The release agent preferably blended into the release agent aromatic polycarbonate-alicyclic polyester resin composition is at least one selected from aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, and aliphatic hydrocarbon compounds. A kind of compound.

  Examples of the aliphatic carboxylic acid include saturated or unsaturated aliphatic monovalent, divalent or trivalent carboxylic acid. Here, the aliphatic carboxylic acid includes alicyclic carboxylic acid. Among these, preferable aliphatic carboxylic acids are monovalent or divalent carboxylic acids having 6 to 36 carbon atoms, and aliphatic saturated monovalent carboxylic acids having 6 to 36 carbon atoms are more preferable. Specific examples of such aliphatic carboxylic acids include palmitic acid, stearic acid, caproic acid, capric acid, lauric acid, arachidic acid, behenic acid, lignoceric acid, serotic acid, melissic acid, tetrariacontanoic acid, montanic acid. , Adipic acid, azelaic acid and the like.

  As the aliphatic carboxylic acid in the ester of an aliphatic carboxylic acid and an alcohol, the same one as the aliphatic carboxylic acid can be used. Examples of the alcohol that reacts with the aliphatic carboxylic acid to form an ester include saturated or unsaturated monohydric alcohols and saturated or unsaturated polyhydric alcohols. These alcohols may have a substituent such as a fluorine atom or an aryl group. Among these alcohols, monovalent or polyvalent saturated alcohols having 30 or less carbon atoms are preferable, and aliphatic saturated monohydric alcohols or polyhydric alcohols having 30 or less carbon atoms are more preferable. Here, aliphatic includes alicyclic compounds. Specific examples of these alcohols include octanol, decanol, dodecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, pentaerythritol, 2,2-dihydroxyperfluoropropanol, neopentylene glycol, ditrimethylolpropane, dipentaerythritol. Etc. These ester compounds of aliphatic carboxylic acids and alcohols may contain aliphatic carboxylic acids and / or alcohols as impurities, or may be a mixture of a plurality of compounds.

  Specific examples of esters of aliphatic carboxylic acids and alcohols include beeswax (a mixture based on myricyl palmitate), stearyl stearate, behenyl behenate, stearyl behenate, glycerin monopalmitate, glycerin monostearate Examples thereof include rate, glycerin distearate, glycerin tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, and pentaerythritol tetrastearate.

  Examples of the aliphatic hydrocarbon include liquid paraffin, paraffin wax, microwax, polyethylene wax, Fischer-Tropsch wax, and an α-olefin oligomer having 3 to 12 carbon atoms. Here, as the aliphatic hydrocarbon, an alicyclic hydrocarbon is also included. Moreover, these hydrocarbon compounds may be partially oxidized.

The compounding ratio of the release agent is usually 0.01 to 1 part by weight with respect to 100 parts by weight of the total of the A component and the B component. When the compounding ratio of the release agent exceeds 1 part by weight, there are problems such as degradation of hydrolysis resistance and mold contamination during injection molding. One type of release agent can be used, but a plurality of release agents can be used in combination.

Examples of the dye / pigment preferably blended into the dye / aromatic polycarbonate-alicyclic polyester resin composition include inorganic pigments, organic pigments, and organic dyes. Examples of inorganic pigments include sulfide pigments such as carbon black, cadmium red, and cadmium yellow, silicate pigments such as ultramarine blue, titanium oxide, zinc white, petal, chromium oxide, iron black, titanium yellow, and zinc-iron. -Based brown, titanium-cobalt green, cobalt-green, cobalt-blue, oxide-based pigments such as copper-chromium black, copper-iron-based black, chromic pigments such as yellow lead and molybdate orange, ferrocyans such as bitumen And the like. Examples of organic pigments and organic dyes include phthalocyanine dyes such as copper phthalocyanine blue and copper phthalocyanine green, azo dyes such as nickel azo yellow, thioindigo, perinone, perylene, quinacridone, dioxazine, isoindolinone, Examples thereof include condensed polycyclic dyes such as quinophthalone, anthraquinone, heterocyclic, and methyl dyes. Of these, titanium oxide, carbon black, cyanine-based, quinoline-based, anthraquinone-based, and phthalocyanine-based compounds are preferable from the viewpoint of thermal stability, and carbon black, anthraquinone-based compounds, and phthalocyanine-based compounds are more preferable. Specific examples thereof include MACROLEX Blue.
RR, MACROLEX Violet 3R, MACROLEX Violet B (manufactured by Bayer), Sumiplast Violet RR, Sumiplast Violet B, Sumiplast Blue OR (manufactured by Sumitomo Chemical Co., Ltd.), Diaresin ViolD ) And the like.

  The blending ratio of the dye / pigment is usually 1 part by weight or less, preferably 0.3 parts by weight or less, more preferably 0.1 parts by weight or less, based on 100 parts by weight of the total of the A component and the B component. . The colorant can be used alone or in combination of two or more.

  Furthermore, the aromatic polycarbonate-alicyclic polyester resin composition according to the present invention may contain other resins as long as the effects of the present invention are not impaired. Examples of other resins include polyamide resins, polyimide resins, polyetherimide resins, polyurethane resins, polyphenylene ether resins, polyphenylene sulfide resins, polysulfone resins, polyolefin resins such as polyethylene and polypropylene, polystyrene, acrylonitrile-styrene copolymers, etc. And other resins such as styrene resins, polymethacrylate resins, phenol resins, and epoxy resins.

  Although the manufacturing method in particular of the aromatic polycarbonate alicyclic polyester resin composition in connection with this invention is not restrict | limited, It can manufacture with the manufacturing method of a normal thermoplastic resin composition. For example, various mixers such as a tumbler and a Henschel mixer are used to mix an aromatic polycarbonate resin (component A), an alicyclic polyester resin (component B), a phosphorus compound (component C), and an additive component blended as necessary. After mixing in advance, the resin composition can be produced by melt-kneading with a Banbury mixer, roll, Brabender, single-screw kneading extruder, twin-screw kneading extruder, kneader or the like. Moreover, it is also possible to produce a resin composition without mixing each component in advance or by mixing only a part of the components and supplying them to an extruder using a feeder and melt-kneading them. Further, a resin composition can be produced by blending and melting and kneading the B component in the intermediate composition obtained by melt-kneading the A component and the C component, and the intermediate composition obtained by melting and kneading the B component and the C component. The resin composition can also be produced by blending and melting and kneading the component A.

The light guide plate of the present invention is obtained by molding the resin composition. Examples of the molding method include injection molding, compression molding, injection compression molding, extrusion molding, blow molding, and rotational molding. Generally, injection molding is employed.

  The light guide plate of the present invention has a wedge shape, a flat plate shape, etc., and each has a prism-shaped or dot-shaped uneven pattern formed on at least one plane. Such a concavo-convex pattern is imparted by transferring a concavo-convex portion formed on a part of the surface of the mold during injection molding. It is convenient and preferable to form the concavo-convex portion in a nest that is a part of the mold.

  In the case of a wedge-shaped light guide plate, a light source is arranged at the thick end, and in the case of a flat plate type, a light source is arranged at one end, so that a mobile phone, a portable terminal, a camera, a watch, a laptop, a display, lighting, a signal, an automobile An edge light type surface light source body used for a tail lamp, a heating power display of an electromagnetic cooker, and the like is configured. In particular, a light guide plate for a large display such as a liquid crystal television or a notebook personal computer includes a direct-type surface light source body in which a light source is installed on a surface facing a light output surface of the light guide plate. As a light source position light source, a self-luminous body such as a cold cathode tube, an LED, a laser diode, and an organic EL can be used in addition to a fluorescent lamp.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples unless it exceeds the gist. The raw materials and evaluation methods used in the following examples are as follows.

  The polycyclohexane dimethanol cyclohexane dicarboxylate used in this Example and Comparative Example was obtained by the following <Production Method 1>.

<Production Example 1>
A stainless steel reactor equipped with a stirrer, reflux condenser, heating device, pressure gauge, thermometer, and decompression device, and with a capacity of 100 liters, 1,4-cyclohexanedicarboxylic acid (trans isomer: cis cis ratio is 96: 4) 101.5 parts by weight, 1,4-cyclohexanedimethanol (trans isomer: cis isomer ratio is 69:31) 87.5 parts by weight and tetra-n-butyl titanate in 6% by weight butanol solution 0.005 part by weight The reactor was charged and the inside of the reactor was replaced with nitrogen gas. While sealing the inside of the reactor with nitrogen gas, the internal temperature was raised to 150 ° C. in 30 minutes, and further raised from 150 ° C. to 200 ° C. over 1 hour. Next, after carrying out the esterification reaction by holding at a temperature of 200 ° C. for 1 hour, the polycondensation reaction is carried out while gradually raising the pressure in the reactor while increasing the temperature from 200 ° C. to 250 ° C. over 45 minutes. It was. The pressure inside the reactor was maintained at an absolute pressure of 0.1 kPa and a reaction temperature of 250 ° C. for 4.2 hours to complete the polycondensation reaction. After completion of the polycondensation reaction, the obtained resin was extracted in a strand shape into water, cut and pelletized. The intrinsic viscosity and terminal carboxylic acid concentration measured by the following methods were 0.666 dl / g and 5.1 eq / t, respectively.

(1) Viscosity average molecular weight:
The intrinsic viscosity [η] at 20 ° C. in methylene chloride was measured with an Ubbelohde viscometer, and determined by the following formula.
[Η] = 1.23 × 10 ⁻⁴ × (Mv) ^0.83

(2) Average brightness, brightness uniformity and color temperature:
A light guide plate having a wedge-shaped cross section, which is 40 mm wide, 60 mm long, 0.7 mm thin, and 0.9 mm thick, and has a prism-shaped uneven pattern formed on an inclined surface. The prism shape was provided by a mold having a pitch of 200 μm and a depth of 8 μm. As the molding machine, “Sodick TR100EH” manufactured by Sodick Plustech Co., Ltd. was used, and injection molding was performed under conditions of a mold temperature of 125 ° C. and a cylinder temperature of 320 ° C.

  Next, in the dark room, the above light guide plate is disposed so that the concave / convex pattern forming surface is on the lower surface side, and a cold cathode tube is disposed at the thick end portion to constitute an edge type front light type surface light source body. A luminance meter ("Topcon BM-7" manufactured by Topcon Co., Ltd.) was installed at a position 30 cm above the surface on which the concave / convex pattern was not formed, and the luminance and color temperature were measured. The average luminance was obtained by averaging the measured values of a total of 9 locations of 3 levels in width and 3 levels in length. Further, the luminance uniformity was calculated by the formula (minimum luminance value / maximum luminance value) × 100 (%).

  The color temperature is a numerical value representing the relative intensity of blue and red, defined as “temperature of a black body when a perfect black body emits light of the same color as that light”. A higher value indicates a stronger blue color. When used for applications such as displays, the higher the color temperature, the better the color display visibility. Therefore, the light guide plate is required to have a high color temperature.

  About Examples 1-5 and Comparative Examples 1 and 2, after blending each raw material in the ratio shown in Table 2, a screw diameter 40 mm vented single screw extruder ("VS-40" manufactured by Tanabe Plastics Machinery Co., Ltd.) The mixture was melt-kneaded at a cylinder temperature of 250 ° C., and pellets were prepared by strand cutting. Further, the obtained pellets were dried at 120 ° C. for 5 to 7 hours by a hot air circulation dryer, and then a light guide plate molded product for evaluation was molded. Table 2 shows the evaluation results of the obtained molded product.

Claims (6)

(A) Viscosity average molecular weight of 10,000 or more and 25000 or less, aromatic polycarbonate resin of 50 to 95 parts by weight, and (B) alicyclic polyester resin of 5 to 50 parts by weight in total of 100 parts by weight (C) Aromatic polycarbonate-alicyclic polyester containing 0.001 to 0.3 parts by weight of at least one compound selected from the group consisting of compounds represented by the following general formulas (I) to (VI) A light guide plate comprising a resin composition.
Formula (I)
O = P (OH) _n (OR) _3-n (I)
(In general formula (I), R is an alkyl group or an aryl group, and may be the same or different. N represents an integer of 0 to 2.)
Formula (II)

(In the general formula (II), R ′ is an alkyl group or an aryl group, which may be the same or different.)
Formula (III)

(In the general formula (III), R ^{1 to} R ⁴ are alkyl groups or aryl groups, which may be the same or different. M represents a metal selected from alkaline earth metals and zinc.)
Formula (IV)

(In general formula (IV), R ⁵ represents an alkyl group or an aryl group, and M represents a metal selected from alkaline earth metals and zinc.)
General formula (V)

(In the general formula (V), R ^{6 to} R ¹¹ are alkyl groups or aryl groups, which may be the same or different. M ′ represents a metal atom that becomes a trivalent metal ion.)
Formula (VI)

(In the general formula (VI), R ^{12 to} R ¹⁴ are alkyl groups or aryl groups, which may be the same or different. M ′ represents a metal atom that becomes a trivalent metal ion; Two M's may be the same or different.   The (B) alicyclic polyester resin is a condensate of an alicyclic dicarboxylic acid mainly composed of a 1,4-cyclohexanedicarboxylic acid component and an alicyclic diol mainly composed of 1,4-cyclohexanedimethanol. The light guide plate according to claim 1, wherein the light guide plate is a light guide plate.   The (A) aromatic polycarbonate resin is more than 50 parts by weight and 95 parts by weight or less, and the (B) alicyclic polyester resin is 5 parts by weight or more and less than 50 parts by weight, The light guide plate according to claim 1 or 2. The compound (C) contains at least two or more of organophosphate metal salts represented by the general formulas (III) to (VI), and R in the general formulas (III) to (VI). ¹ to
The light guide plate according to claim 1, wherein R ¹⁴ is an alkyl group having 2 to 25 carbon atoms.   With respect to a total of 100 parts by weight of the (A) aromatic polycarbonate resin and the (B) alicyclic polyester resin, the phosphoric acid ester represented by the general formula (I) and / or the general formula (II) A group consisting of 0.001 to 0.3 parts by weight of at least one selected from the group consisting of the phosphite esters represented, and an organophosphate metal salt represented by the general formulas (III) to (VI) The light guide plate according to any one of claims 1 to 4, wherein 0.001 to 0.3 parts by weight of at least one selected from the above is contained. A polyorganosiloxane having a phenyl group at least in a side chain and a kinematic viscosity at 25 ° C. of 1 to 200 cSt is 100 parts by weight in total of the (A) aromatic polycarbonate resin and the (B) alicyclic polyester resin. The light guide plate according to any one of claims 1 to 5, comprising 0.01 to 1 part by weight.