JPWO2016158844A1 - Molded body for light guide plate - Google Patents

Abstract

According to the present invention, there is provided an injection molded article for a light guide plate having a terminal structure represented by the following general formula (1) and containing a polycarbonate resin having a viscosity average molecular weight of 13,000 to 18,000. be able to. [Chemical 1]

Description

  The present invention relates to a molded article for a light guide plate containing a polycarbonate resin.

  In recent years, in various portable terminals such as smartphones and tablet terminals, the thinning and large thinning of liquid crystal displays are proceeding at a remarkable speed. Along with this, as the light incident method to the light guide plate, an edge type that is performed from a direct type to a side edge is often adopted, and sufficient luminance and further strength are required as an ultra-thin light source.

In the case of a liquid crystal display equipped with a touch panel, it is important to prevent damage to the light guide plate even if it is small. If an abnormally large load is applied to the surface of the touch panel due to an input load with an input pen or a finger, cracks and crazes are generated on the light guide plate, and the fine protrusion shape on the upper surface of the light guide plate is damaged.
As a result, the damaged part emits bright light when turned on, and the visibility of the liquid crystal display is significantly lowered. In order to prevent such damage, it is important to improve the strength of the light guide plate. In particular, in a liquid crystal display having a large screen, it is easy to bend due to a load at the time of input. Therefore, it is extremely important to improve the impact resistance strength of the light guide plate.

In general, when a large and thin molded article is produced by injection molding using a thermoplastic resin, it is necessary to increase the fluidity of the resin in order to ensure high transferability. Therefore, the viscosity average molecular weight of the resin is often lowered. However, if the molecular weight of the resin is too small, the strength of the molded body is insufficient and cracks are likely to occur in the molded body during mold release. Therefore, there is a limit in improving the fluidity of the resin by reducing the molecular weight.
Moreover, if it is a thermoplastic resin obtained from the same structural unit, there exists a tendency for the molded object excellent in fluidity | liquidity and transferability to be obtained, so that a glass transition temperature (Tg) is low. However, if Tg is too low, an injection molded article having excellent heat resistance cannot be obtained.

  For example, a conventional polycarbonate resin (commonly referred to as BPA-PC, hereinafter referred to as BPA-PC) obtained by reacting 2,2-bis (4-hydroxyphenyl) propane (commonly referred to as bisphenol A, hereinafter abbreviated as BPA) with phosgene or a carbonic acid diester. (Abbreviation) is excellent in heat resistance, transparency, and mechanical properties such as impact resistance. Therefore, not only structural materials but also optical materials such as light guide plates for liquid crystals, optical disk substrates, various lenses, prisms, optical fibers Etc. are widely used.

  However, with the recent expansion of optical material applications, BPA-PC may have insufficient impact resistance, so there is a strong demand for the development of large and thin light-guide plate injection bodies with improved impact resistance. ing.

Japanese Patent Laid-Open No. 11-300842 JP 2000-153535 A International Publication No. 2007/132874 Japanese Patent No. 4156162 Japanese Patent No. 3758951

In order to solve such a problem, for example, in Patent Documents 1 to 3, an optical disk using a polycarbonate resin suitable for injection molding by changing the type of terminal stopper while maintaining the main skeleton as the bisphenol A type. A substrate is disclosed. However, Patent Documents 1 to 3 do not describe a light guide plate using polycarbonate resin, and the resins described in these documents have sufficient impact resistance strength to be used as a large light guide plate. It may not have been done.
Patent Document 4 proposes a light guide plate using a polycarbonate resin having a long-chain alkyl group as a terminal group and having improved fluidity. However, further increase in fluidity is required for enlargement, and there is room for improvement in impact resistance.
Patent Document 5 proposes a substrate for an optical information recording medium having improved heat discoloration using a polycarbonate resin having a long-chain alkyl group as a terminal group, but as a molded article for a light guide plate, impact resistance and There was room for further improvement in transferability.

  This invention makes it the subject to provide the molded object for light guide plates excellent in impact resistance containing polycarbonate resin.

As a result of intensive studies, the inventors of the present invention have a light-guide plate injection-molded article containing a polycarbonate resin having a specific terminal structure and a specific viscosity average molecular weight, compared with a molded article made of a conventional polycarbonate resin, The inventors have found that it is excellent in impact resistance and can be a large-sized molded product, and have reached the present invention.
That is, this invention relates to the injection molding for light-guide plates containing the polycarbonate resin shown below.
<1> An injection molded article for a light guide plate having a terminal structure represented by the following general formula (1) and containing a polycarbonate resin having a viscosity average molecular weight of 13,000 to 18,000.
(Where
R ₁ represents an alkyl group having 5 to 23 carbon atoms or an alkenyl group having 8 to 36 carbon atoms,
R _{2 to} R ₅ are each independently a group consisting of hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms and an optionally substituted aryl group having 6 to 12 carbon atoms. Any one of )
<2> The molded article according to <1>, wherein the polycarbonate resin contains a structural unit represented by the following general formula (2).
(Where
R _{6 to} R ₁₃ are each independently hydrogen, halogen, an optionally substituted alkoxy group having 1 to 5 carbon atoms, an optionally substituted alkyl group having 1 to 20 carbon atoms, or a substituent. An alkoxy group having 1 to 5 carbon atoms, an aryl group having 6 to 12 carbon atoms that may have a substituent, an aralkyl group having 7 to 17 carbon atoms that may have a substituent, and a substituent Any one of the group consisting of alkenyl groups having 2 to 15 carbon atoms which may have a group;
X is a structure selected from the group consisting of a single bond, —O—, —S—, —SO—, —SO ₂ —, —CO—, and the following general formulas (3) to (6). )
(Where
R ₁₄ and R ₁₅ each independently represents hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted alkoxy group having 1 to 5 carbon atoms, or a substituent. It consists of an aryl group having 6 to 12 carbon atoms which may have, an alkenyl group having 2 to 5 carbon atoms which may have a substituent, and an aralkyl group having 7 to 17 carbon atoms which may have a substituent. Represents one of the groups,
c represents an integer of 1 to 20. )
(In the formula, R ₁₆ and R ₁₇ are each independently hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms, or an optionally substituted alkoxy group having 1 to 5 carbon atoms. , An aryl group having 6 to 12 carbon atoms which may have a substituent, an alkenyl group having 2 to 5 carbon atoms which may have a substituent, and an aralkyl having 7 to 17 carbon atoms which may have a substituent It represents one of the group consisting of groups, and R ₁₆ and R ₁₇ may be bonded to each other to form a carbocyclic or heterocyclic ring having 1 to 20 carbon atoms.
(Wherein R _{18 to} R ₂₁ are each independently hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms, or an optionally substituted alkoxy group having 1 to 5 carbon atoms. , An aryl group having 6 to 12 carbon atoms which may have a substituent, an alkenyl group having 2 to 5 carbon atoms which may have a substituent, and an aralkyl having 7 to 17 carbon atoms which may have a substituent It represents one of the group consisting of groups, and R ₁₈ and R ₁₉ and R ₂₀ and R ₂₁ may be bonded to each other to form a carbocyclic or heterocyclic ring having 1 to 20 carbon atoms.
(In formula, R < ₂₂ > -R < ₃₁ > is a hydrogen atom or a C1-C3 alkyl group each independently.)
<3> The molded article according to <1> or <2>, wherein the terminal structure has a structure represented by the following general formula (8).
(In the formula, R ₁ is an alkyl group having 5 to 23 carbon atoms.)
<4> The molding according to <3>, wherein R ₁ in the general formula (8) is at _{least one} of the group consisting of a 2-ethylhexyl group, a 2-hexyldecyl group, a hexadecyl group, and a docosyl group. body.
<5> The molded article according to any one of <2> to <4>, wherein X in the general formula (2) has the structure of the general formula (3).
<6> The molded product according to any one of <1> to <5>, wherein the polycarbonate resin has a Q value of 10 × 10 ⁻² cc / sec or more.
<7> The molded product according to any one of <1> to <6>, wherein the polycarbonate resin has an Izod impact strength of 30 J / m or more.
<8> The molded article according to any one of <1> to <7>, wherein the polycarbonate resin has a glass transition temperature of 90 ° C. or higher.
<9> A light guide plate containing the molded article according to any one of <1> to <8> as a member.

  The molded article for light guide plate injection of the present invention is superior in impact resistance compared to conventional molded articles, and can be easily increased in size. In addition, the molded article of the present invention can maintain the characteristics (for example, impact resistance, transferability, heat resistance, transparency, hue) required for the light guide plate for liquid crystal while maintaining the original characteristics of the polycarbonate resin. It is suitable as a thin-walled and large-sized optical material, particularly as an injection molded article for a light guide plate.

  Next, although an example of embodiment of this invention is demonstrated, this invention is not limited to the following embodiment.

[Injection molding for light guide plate]
The injection molded article for a light guide plate of the present invention contains a polycarbonate resin having a specific structure and a viscosity average molecular weight. The polycarbonate resin will be described below.

[Polycarbonate resin]
The polycarbonate resin contained in the injection molded article for a light guide plate of the present invention has a terminal structure represented by the following general formula (1) and has a viscosity average molecular weight of 13,000 to 18,000.

In general formula (1), R ₁ represents an alkyl group having 5 to 23 carbon atoms or an alkenyl group having 8 to 36 carbon atoms. R _{2 to} R ₅ are each independently a group consisting of hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms and an optionally substituted aryl group having 6 to 12 carbon atoms. Any one of Here, each said substituent is a halogen, a C1-C20 alkyl group, or a C6-C12 aryl group each independently.

The terminal structure represented by the general formula (1) is more preferably the one represented by the general formula (8).
In General Formula (8), R ₁ represents an alkyl group having 5 to 23 carbon atoms. R ₁ is more preferably an alkyl group having 6 to 22 carbon atoms, more preferably 6 to 20 carbon atoms, and particularly preferably 8 to 16 carbon atoms. Specifically, R ₁ is preferably at least one of the group consisting of 2-ethylhexyl group, 2-hexyldecyl group, hexadecyl group and docosyl group.

The polycarbonate resin is obtained by performing polymerization using a dihydroxy compound and a carbonate ester-forming compound and stopping the reaction with a terminal terminator represented by the general formula (1a).
Each raw material of polycarbonate resin is explained in full detail below.

<Dihydroxy compound>
The dihydroxy compound used in the polycarbonate resin contained in the injection molded article for the light guide plate of the present invention is not particularly limited as long as it is a phenolic compound having two hydroxyl groups in the molecule, and the impact resistance of the obtained molded article, From the viewpoint of high purity and a large amount of flow, a dihydric phenol represented by the general formula (7) is preferable. By using such a dihydric phenol, the obtained polycarbonate resin has a structural unit represented by the general formula (2).

In General Formula (7), R _{6 to} R ₁₃ are each independently hydrogen, halogen, an alkoxyl group having 1 to 5 carbon atoms that may have a substituent, or 1 to carbon atoms that may have a substituent. 20 alkyl groups, an optionally substituted alkoxy group having 1 to 5 carbon atoms, an optionally substituted aryl group having 6 to 12 carbon atoms, and an optionally substituted carbon number 7 Represents any one of a group consisting of an aralkyl group of -17 and an alkenyl group having 2 to 15 carbon atoms which may have a substituent, and X represents a single bond, -O-, -S-, -SO-, It is any structure among the group consisting of —SO ₂ —, —CO— and the following general formulas (3) to (6).

In general formula (3), R ₁₄ and R ₁₅ each independently have 1 to 20 carbon atoms, preferably 1 to 8 carbon atoms, more preferably 1 to 3 carbon atoms, which may have hydrogen, halogen, or a substituent. An alkyl group having 1 to 5 carbon atoms which may have a substituent, preferably an alkoxy group having 1 to 3 carbon atoms and an optionally substituted alkyl group having 6 to 12 carbon atoms, preferably 6 to 8 carbon atoms. An aryl group, an optionally substituted aralkyl group having 7 to 17 carbon atoms, preferably 7 to 12 carbon atoms, or an optionally substituted aryl group having 2 to 15 carbon atoms, preferably 2 carbon atoms. Represents an alkenyl group of ˜5. Here, each said substituent is a halogen, a C1-C20 alkyl group, or a C6-C12 aryl group each independently. c represents an integer of 1 to 20, preferably 1 to 12, and more preferably an integer of 1.

In General Formula (4), R ₁₆ and R ₁₇ each independently have hydrogen, halogen, or an optionally substituted alkyl group or substituent having 1 to 20 carbon atoms, preferably 1 to 9 carbon atoms. May have 1 to 5 carbon atoms, preferably 1 to 3 alkoxy groups, and 6 to 12 carbon atoms, preferably 6 to 8 aryl groups and substituents. It represents an aralkyl group having 7 to 17 carbon atoms, preferably 7 to 12 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms, preferably 2 to 5 carbon atoms which may have a substituent. Here, each said substituent is a halogen, a C1-C20 alkyl group, or a C6-C12 aryl group each independently. R ₁₆ and R ₁₇ may be bonded to each other to form a carbocyclic or heterocyclic ring having 1 to 20 carbon atoms, preferably 1 to 12 carbon atoms.

In General Formula (5), R _{18 to} R ₂₁ each independently have hydrogen, halogen, or an optionally substituted alkyl group or substituent having 1 to 20 carbon atoms, preferably 1 to 9 carbon atoms. May have 1 to 5 carbon atoms, preferably 1 to 3 alkoxy groups, and 6 to 12 carbon atoms, preferably 6 to 8 aryl groups and substituents. It represents an aralkyl group having 7 to 17 carbon atoms, preferably 7 to 12 carbon atoms, or an alkenyl group having 2 to 15 carbon atoms, preferably 2 to 5 carbon atoms which may have a substituent. Here, each said substituent is a halogen, a C1-C20 alkyl group, or a C6-C12 aryl group each independently. R ₁₈ and R ₁₉ and R ₂₀ and R ₂₁ may be bonded to each other to form a carbocyclic or heterocyclic ring having 1 to 20 carbon atoms.

In the general formula (6), R _{22 to} R ₃₁ are each independently a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and at least one, preferably three of R _{22 to} R ₃₁ have 1 carbon atom. ˜3 alkyl groups.

Examples of the dihydroxy compound represented by the general formula (7) include 2,2-bis (4-hydroxyphenyl) propane (BPA), 1,1-bis (4-hydroxyphenyl) ethane, and bis (4-hydroxyphenyl). ) Methane, bis (4-hydroxyphenyl) -p-diisopropylbenzene, 4,4′-dihydroxydiphenyl, 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane, 2,2-bis (4 -Hydroxy-3-methylphenyl) propane, 2,2-bis (4-hydroxy-3,5-diethylphenyl) propane, 2,2-bis (4-hydroxy-3-ethylphenyl) propane, 2,2- Bis (4-hydroxy-3,5-diphenylphenyl) propane, 2,2-bis (4-hydroxy-3-phenylphenyl) propyl Lopan, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane, 2,2-bis (4-hydroxyphenyl) pentane 2,4′-dihydroxy-diphenylmethane, bis- (4-hydroxy-3-methylphenyl) methane, bis- (4-hydroxy-3-nitrophenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane 1,1-bis (4-hydroxy-3-methylphenyl) ethane, 3,3-bis (4-hydroxyphenyl) pentane, 1,1-bis (4-hydroxyphenyl) cyclohexane [= bisphenol Z], bis (4-hydroxyphenyl) sulfone, 2,4′-dihydroxydiphenylsulfone, bis (4-hydroxyphenyl) Rufide, 4,4′-dihydroxydiphenyl ether, 4,4′-dihydroxy-3,3′-dimethyldiphenyl ether, 4,4′-dihydroxy-2,5-diethoxydiphenyl ether, 1-phenyl-1,1-bis ( 4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxy-3-methylphenyl) cyclohexane, 1-phenyl-1,1-bis (4-hydroxy-3-methylphenyl) ethane, bis (4-hydroxy) Phenyl) diphenylmethane, bis (4-hydroxy-3-methylphenyl) diphenylmethane, 9,9-bis (4-hydroxyphenyl) fluorene, 9,9-bis (4-hydroxy-3-methylphenyl) fluorene, and 2, 2-bis (4-hydroxyphenyl) hexafluoropropane, etc. . Among them, 2,2-bis (4-hydroxyphenyl) propane (BPA), 1,1-bis (4-hydroxyphenyl) ethane, and bis (4-hydroxyphenyl) methane are more preferable, and stability as a monomer, Furthermore, 2,2-bis (4-hydroxyphenyl) propane (BPA) is particularly preferable from the viewpoint that it is easy to obtain a product containing a small amount of impurities.
These dihydroxy compounds can be used alone or in admixture of two or more.

  Moreover, the polycarbonate resin contained in the injection molded body for the light guide plate of the present invention may have a branched structure as necessary. In order to obtain a branched polycarbonate resin, phloroglucin, 4,6-dimethyl-2,4,6-tris (4-hydroxyphenyl) heptene-2, 4,6-dimethyl-2,4,6-tris (4- Hydroxyphenyl) heptane, 2,6-dimethyl-2,4,6-tris (4-hydroxyphenyl) heptene-3, 1,3,5-tris (4-hydroxyphenyl) benzene, 1,1,1-tris A polyhydroxy compound represented by (4-hydroxyphenyl) ethane or the like, or 3,3-bis (4-hydroxyaryl) oxindole (= isatin bisphenol), 5-chlorisatin bisphenol, 5,7-dichloro Dihydroxylation of polyfunctional compounds represented by luisatin bisphenol, 5-bromoisatin bisphenol, etc. May be used by replacing a part of the object, as the amount from 0.01 to 10 mol% of all dihydroxy compounds, preferably, it can be replaced 0.1-3 mol%.

<Carbonate forming compound>
Examples of the carbonate ester forming compound used in the polycarbonate resin contained in the injection molded article for the light guide plate of the present invention include phosgene, triphosgene, carbonic acid diester, and a carbonyl compound. Among the carbonate ester-forming compounds, phosgene is particularly preferable from the viewpoint of quality such as hue and stability of the obtained resin, and cost.

  Examples of the carbonyl compound include carbon monoxide and carbon dioxide.

  Examples of the carbonic acid diester include dialkyl carbonate compounds such as dimethyl carbonate, diethyl carbonate, and di-tert-butyl carbonate, diphenyl carbonate, di-p-tolyl carbonate, phenyl-p-tolyl carbonate, and di-p-chlorophenyl carbonate. A diaryl carbonate compound is mentioned. Among these, diphenyl carbonate, and substituted diphenyl carbonates such as di-p-tolyl carbonate, phenyl-p-tolyl carbonate, and di-p-chlorophenyl carbonate are reactive, the hue of the resulting resin, and further from the viewpoint of cost. To diphenyl carbonate. These carbonic acid diester compounds can be used alone or in admixture of two or more.

<End terminator>
The terminal terminator used for the polycarbonate resin contained in the injection molded article for the light guide plate of the present invention is a monohydric phenol represented by the following general formula (1a).

In General Formula (1a), R ₁ represents an alkyl group having 5 to 23 carbon atoms or an alkenyl group having 8 to 36 carbon atoms. R _{2 to} R ₅ each independently represent hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms, or an optionally substituted aryl group having 6 to 12 carbon atoms. . R _{2 to} R ₅ are preferably hydrogen, halogen, an optionally substituted alkyl group having 1 to 9 carbon atoms, or an optionally substituted aryl group having 6 to 8 carbon atoms. is there. Here, each said substituent is a halogen, a C1-C20 alkyl group, or a C6-C12 aryl group each independently.

In general formula (1a), R ₁ is preferably an alkyl group having 5 to 23 carbon atoms or an alkenyl group having 8 to 36 carbon atoms from the viewpoint of maintaining fluidity and thermal stability.
When the carbon number of R ₁ in the general formula (1a) is 23 or less, the Tg of the polycarbonate resin contained in the injection molded article for the light guide plate of the present invention is relatively high, and the thermal stability tends to be improved. When the carbon number of R ₁ exceeds 5, fluidity and impact resistance tend to be improved.

Further, the terminal terminator represented by the general formula (1a) is more preferably one represented by the general formula (8a).
In General Formula (8a), R ₁ represents an alkyl group having 5 to 23 carbon atoms. R ₁ is more preferably an alkyl group having 6 to 22 carbon atoms, more preferably 6 to 20 carbon atoms, and particularly preferably 8 to 16 carbon atoms.

Specific examples of the terminal terminator include one or a plurality of parahydroxybenzoic acid 2-ethylhexyl ester, parahydroxybenzoic acid 2-hexyldecyl ester, parahydroxybenzoic acid hexadecyl ester, and parahydroxybenzoic acid docosyl ester. It is preferable to use it as a terminator from the viewpoint of heat resistance.
Furthermore, it is more preferable to use either or both of parahydroxybenzoic acid 2-ethylhexyl ester and parahydroxybenzoic acid hexadecyl ester as a terminal terminator in terms of heat resistance and availability.

  Depending on the production conditions of the polycarbonate resin contained in the injection-molded article for the light guide plate of the present invention, a terminal group with a phenolic OH group that does not react with the terminal stopper may be formed. This phenolic OH group is preferably as small as possible from the viewpoint of hydrolysis resistance. Specifically, 80 mol% or more of all terminals are preferably sealed with a structure represented by the general formula (1), and 90 mol% or more of all terminals are represented by the general formula (1). It is particularly preferred that the structure is sealed.

The terminal stopper used in the present invention may be used in combination of two or more kinds within the range not departing from the gist of the present invention depending on the required properties for the material, and is used in combination with a structure other than the structure represented by the general formula (1a). It is permissible.
Examples of the terminal terminator that may be used in combination include phenol, p-cresol, o-cresol, 2,4-xylenol, p-t-butylphenol, o-allylphenol, p-allylphenol, p-hydroxystyrene, p- Hydroxy-α-methylstyrene, p-propylphenol, p-cumylphenol, p-phenylphenol, o-phenylphenol, p-trifluoromethylphenol, p-nonylphenol, p-dodecylphenol, eugenol, amylphenol, hexyl Alkylphenols such as phenol, heptylphenol, octylphenol, nonylphenol, decylphenol, dodecylphenol, myristylphenol, palmitylphenol, stearylphenol, behenylphenol, and parahydro Methyl ester of shea benzoic acid, ethyl ester, propyl ester, butyl ester, amyl ester, hexyl esters, parahydroxybenzoic acid alkyl esters such as heptyl ester. It is also possible to use two or more of the above end terminators in combination. In particular, a terminal stopper that may be used in combination is p-t-butylphenol from the viewpoint of purity and cost.
When using another terminal terminator, it is preferably 20 mol% or less, more preferably 10 mol% or less, based on the total terminal terminator.

<Use amount of terminal terminator (monohydric phenol)>
The molecular weight of the polycarbonate resin contained in the injection molded article for the light guide plate of the present invention is controlled by the amount of the end stopper used.
The degree of polymerization of the dihydroxy compound used for the main skeleton and the amount of the terminal terminator used are shown in the following formula (I).

  Based on this formula, the usage amount of the terminal terminator (monohydric phenol) and the dihydroxy compound is determined, but the preferred range of the usage amount (mol) of the dihydroxy compound: the usage amount (mol) of the terminal terminator is 50: 1. -4: 1, more preferably in the range of 40: 1 to 6: 1, particularly preferably 20: 1 to 6: 1.

  The polycarbonate resin contained in the injection molded article for the light guide plate of the present invention is allowed to be mixed with other resins and various additives within the range not departing from the gist of the present invention, depending on the characteristics required for the material. Is done.

[Other resins that can be mixed]
The injection molded body for the light guide plate of the present invention may contain other resins as necessary. Examples of such other resins include heat such as polycarbonate resin other than the polycarbonate resin used in the present invention, polyethylene terephthalate resin (PET resin), polytrimethylene terephthalate (PTT resin), and polybutylene terephthalate resin (PBT resin). Plastic polyester resin; polystyrene resin (PS resin), high impact polystyrene resin (HIPS), styrene resin such as acrylonitrile-styrene copolymer (AS resin), methyl methacrylate-styrene copolymer (MS resin); methyl methacrylate- Core / shell type elastomers such as acrylic rubber-styrene copolymer (MAS), elastomers such as polyester elastomers; cyclic cycloolefin resin (COP resin), cyclic cycloolefin (COP) copolymer Polyolefin resin such as fat; Polyamide resin (PA resin); Polyimide resin (PI resin); Polyetherimide resin (PEI resin); Polyurethane resin (PU resin); Polyphenylene ether resin (PPE resin); Polyphenylene sulfide resin (PPS resin) ); Polysulfone resin (PSU resin); polymethacrylate resin (PMMA resin); polycaprolactone and the like. Particularly preferred mixed resins include PS resin, AS resin, and PMMA resin.
The component ratio of the other resin in the injection molded body for the light guide plate of the present invention is preferably 10% by mass or less, more preferably 1% by mass or less, based on the total resin components. Various physical properties can be maintained by setting the component ratio of the other resin to 10% by mass or less.

[Additive]
Various additives may be blended in the injection molded article for the light guide plate of the present invention without departing from the gist of the present invention. Examples of the additive include at least one additive selected from the group consisting of a heat stabilizer, an antioxidant, a flame retardant, a flame retardant aid, an ultraviolet absorber, a release agent, and a colorant.
In addition, an antistatic agent, a fluorescent whitening agent, an antifogging agent, a fluidity improving agent, a plasticizer, a dispersing agent, an antibacterial agent and the like may be added as long as desired physical properties are not significantly impaired.

  Examples of the heat stabilizer include phenol-based, phosphorus-based, and sulfur-based heat stabilizers. Specifically, phosphorus oxoacids such as phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, polyphosphoric acid; acidic pyrophosphate metal salts such as acidic sodium pyrophosphate, acidic potassium pyrophosphate, acidic calcium pyrophosphate; potassium phosphate , Sodium phosphate, cesium phosphate, zinc phosphate, etc., Group 1 or Group 10 metal phosphates; organic phosphate compounds, organic phosphite compounds, organic phosphonite compounds, and the like. Alternatively, a phosphite compound (a), phosphorous acid (b) and tetrakis esterified with phenol and / or phenol having at least one alkyl group having 1 to 25 carbon atoms in at least one ester in the molecule Mention may be made of at least one selected from the group of (2,4-di-tert-butylphenyl) -4,4′-biphenylene-di-phosphonite (c). Specific examples of the phosphite compound (a) include trioctyl phosphite, trioctadecyl phosphite, tridecyl phosphite, trilauryl phosphite, tristearyl phosphite, triphenyl phosphite, tris (monononylphenyl) phos Phyto, Tris (monononyl / dinonyl phenyl) phosphite, Trisnonyl phenyl phosphite, Tris (octylphenyl) phosphite, Tris (2,4-di-tert-butylphenyl) phosphite, Trinonyl phosphite, Didecyl Monophenyl phosphite, dioctyl monophenyl phosphite, diisopropyl monophenyl phosphite, monobutyl diphenyl phosphite, monodecyl diphenyl phosphite, bis (2,4-di-tert-butyl) Ruphenyl) pentaerythritol phosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol phosphite, monooctyl diphenyl phosphite, distearyl pentaerythritol diphosphite, tricyclohexyl phosphite, diphenylpenta Erythritol diphosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, 2,2-methylenebis (4,6-di-tert-butylphenyl) octyl phosphite, bis (Nonylphenyl) pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-ethylphenyl) Mention may be made of pentaerythritol diphosphite and the like. These may be used alone or in combination of two or more.

  Specific examples of the organic phosphite compound include, for example, “ADEKA STAB 1178”, “ADEKA STAB 2112”, “ADEKA STAB HP-10”, and “JP-351” manufactured by Johoku Chemical Industry Co., Ltd. (trade name, the same applies hereinafter). ”,“ JP-360 ”,“ JP-3CP ”,“ Irgaphos 168 ”manufactured by BASF, and the like.

  Examples of phosphoric acid stabilizers include trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, triphenyl phosphate, tricresyl phosphate, tris (nonylphenyl) phosphate, 2-ethylphenyl diphenyl phosphate, and the like. it can. In addition, 1 type may contain phosphorus stabilizer and 2 or more types may contain it by arbitrary combinations and a ratio.

  When blended, the addition ratio of the heat stabilizer is, for example, 0.001 part by mass or more, preferably 0.01 part by mass or more, more preferably 0.03 part by mass or more, with respect to 100 parts by mass of the polycarbonate resin. Moreover, it is 1 mass part or less, Preferably it is 0.7 mass part or less, More preferably, it is 0.5 mass part or less. If the amount of the heat stabilizer is too small, the heat stabilizing effect may be insufficient. If the amount of the heat stabilizer is too large, the effect may reach a peak and may not be economical.

  Examples of the antioxidant include phenolic antioxidants, hindered phenolic antioxidants, bisphenolic antioxidants, polyphenolic antioxidants, and the like. Specifically, 2,6-di-tert-butyl-4-methylphenol, tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, n-octadecyl-3- (3 ′, 5'-di-tert-butyl-4'-hydroxyphenyl) propionate, tetrakis [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane, 4,4'-butylidenebis- (3-methyl-6-tert-butylphenol), triethylene glycol-bis [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate], 3,9-bis {2- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1,1-dimethylethyl} 2,4,8,10-tetraoxaspiro [5,5] undecane, pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) 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-alkyl Sol, 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-bis (octylthio) -1,3,5-triazin-2-ylamino ) Phenol etc. Specific examples of the phenolic antioxidant include, for example, “Irganox 1010” (registered trademark, the same shall apply hereinafter) manufactured by BASF, “ Ruganokkusu 1076 ", ADEKA Co., Ltd." STAB AO-50 ", and the like can be given" ADK STAB AO-60 ". In addition, 1 type may contain the phenol type stabilizer, and 2 or more types may contain it by arbitrary combinations and a ratio.

  When added, the addition ratio of the antioxidant is, for example, 0.001 part by mass or more, preferably 0.01 part by mass or more, and 1 part by mass or less, preferably 0 with respect to 100 parts by mass of the polycarbonate resin. .5 parts by mass or less. If the addition ratio of the antioxidant is too small, the effect as an antioxidant may be insufficient, and if the addition ratio of the antioxidant is too large, the effect reaches a peak and may not be economical. is there.

  Examples of the flame retardant include organic sulfonic acid metal salts. Examples of the organic sulfonic acid metal salts include aliphatic sulfonic acid metal salts and aromatic sulfonic acid metal salts. These may be used alone or in combination of two or more. Moreover, as a metal salt, an alkali metal salt and an alkaline-earth metal salt are preferable. Examples of the alkali metal include sodium, lithium, potassium, rubidium, and cesium. Examples of alkaline earth metals include calcium and strontium. The preferred metal of the organic sulfonic acid metal salt used in the present invention is an alkali metal such as sodium, potassium, rubidium and cesium, more preferably sodium and potassium. By adopting such a metal, it is possible to effectively promote formation of a carbonized layer during combustion and maintain high transparency.

The aliphatic sulfonic acid metal salt is preferably a fluoroalkane-sulfonic acid metal salt, more preferably a perfluoroalkane-sulfonic acid metal salt.
In addition, examples of the fluoroalkane-sulfonic acid metal salt include alkali metal salts and alkaline earth metal salts, among which alkali metal salts are preferable. As carbon number of a fluoroalkanesulfonic acid metal salt, 1-8 are preferable and 2-4 are more preferable. By setting it as such a range, the effect that high transparency can be maintained is acquired. Specific examples of preferred fluoroalkane-sulfonic acid metal salts include perfluorobutane-sodium sulfonate, potassium perfluorobutane-sulfonate, sodium perfluoroethane-sulfonate, potassium perfluoroethane-sulfonate, and the like. it can.

  Examples of the aromatic sulfonic acid metal salt include alkali metal salts and alkaline earth metal salts, and alkali metal salts are preferable. Specific examples of the aromatic sulfonesulfonic acid alkali metal salt include 3,4-dichlorobenzenesulfonic acid sodium salt, 2,4,5-trichlorobenzenesulfonic acid sodium salt, benzenesulfonic acid sodium salt, diphenylsulfone-3-sulfone. Sodium salt of acid, potassium salt of diphenylsulfone-3-sulfonic acid, sodium salt of 4,4'-dibromodiphenyl-sulfone-3-sulfonic acid, potassium of 4,4'-dibromophenylsulfone-3-sulfonic acid Salt, disodium salt of diphenylsulfone-3,3'-disulfonic acid, dipotassium salt of diphenylsulfone-3,3'-disulfonic acid, sodium salt of dodecylbenzenesulfonic acid, potassium salt of dodecylbenzenesulfonic acid, p-toluenesulfonic acid Potassium salt, p-styrene Sulfonic acid potassium salt and the like.

  The organic sulfonic acid metal salt that can be used in the injection molded article for a light guide plate according to the present invention is a potassium salt of diphenylsulfone-3-sulfonic acid, p-toluenesulfonic acid, particularly from the viewpoint of improving the transparency of the molded article. A potassium salt, p-styrenesulfonic acid potassium salt, and dodecylbenzenesulfonic acid potassium salt are preferable, and a potassium salt of diphenylsulfone-3-sulfonic acid is more preferable. The added mass of the organic sulfonic acid metal salt with respect to 100 parts by mass of the polycarbonate resin is 0.005 parts by mass to 0.1 parts by mass, preferably 0.01 parts by mass to 0.1 parts by mass, more preferably. Is 0.03 parts by mass to 0.09 parts by mass. Moreover, in this invention, you may mix | blend flame retardants other than organic sulfonic acid metal salt.

  For example, a silicone compound can be added as a flame retardant aid. As a silicone compound, what has a phenyl group in a molecule | numerator is preferable. By having a phenyl group, the dispersibility of the silicone compound in the polycarbonate is improved, and the transparency and flame retardancy are excellent. A preferable mass average molecular weight of the silicone compound is 450 to 5,000, and among them, 750 to 4,000, more preferably 1,000 to 3,000, and particularly preferably 1,500 to 2,500. By making the mass average molecular weight 450 or more, the production becomes easy, the adaptation to industrial production becomes easy, and the heat resistance of the silicone compound is hardly lowered. Conversely, by setting the mass average molecular weight of the silicone compound to 5,000 or less, the dispersibility in the polycarbonate resin is unlikely to decrease, and as a result, the flame retardancy of the molded article and the mechanical properties are more effectively reduced. Tend to be suppressed.

  When blended, the addition ratio of the flame retardant aid is, for example, 0.1 parts by mass or more, preferably 0.2 parts by mass or more, and 7.5 parts by mass or less, with respect to 100 parts by mass of the polycarbonate resin. Preferably it is 5 mass parts or less. If the addition rate of the flame retardant aid is too small, the flame retardancy may be insufficient, and if the addition rate of the flame retardant aid is too high, appearance defects such as delamination will occur and transparency will be reduced. The flame retardancy will reach its peak and may not be economical.

  UV absorbers include inorganic UV absorbers such as cerium oxide and zinc oxide, as well as benzotriazole compounds, benzophenone compounds, salicylate compounds, cyanoacrylate compounds, triazine compounds, oxanilide compounds, malonic ester compounds, hindered amine compounds, and phenyl salicylates. Organic ultraviolet absorbers such as organic compounds. Of these, benzotriazole-based and benzophenone-based organic ultraviolet absorbers are preferred. In particular, specific examples of benzotriazole compounds include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- [2′-hydroxy-3 ′, 5′-bis (α, α-dimethylbenzyl). Phenyl] -benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-tert-butyl-phenyl) -benzotriazole, 2- (2′-hydroxy-3′-tert-butyl-5′-) Methylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-tert-butyl-phenyl) -5-chlorobenzotriazole), 2- (2′-hydroxy-3 ′ , 5′-di-tert-amyl) -benzotriazole, 2- (2′-hydroxy-5′-tert-octylphenyl) benzotriazole, 2,2′-methylenebis [4- ( , 1,3,3-tetramethylbutyl) -6- (2N-benzotriazol-2-yl) phenol], 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5 -[(Hexyl) oxy] -phenol, 2- [4,6-bis (2,4-dimethylphenyl) -1,3,5-triazin-2-yl] -5- (octyloxy) phenol, 2,2 '-(1,4-phenylene) bis [4H-3,1-benzoxazin-4-one], [(4-methoxyphenyl) -methylene] -propanedioic acid-dimethyl ester, 2- (2H-benzotriazole -2-yl) -p-cresol, 2- (2H-benzotriazol-2-yl) -4,6-bis (1-methyl-1-phenylmethyl) phenol, 2- [5-chloro (2H)- Nzotriazol-2-yl] -4-methyl-6- (tert-butyl) phenol, 2,4-di-tert-butyl-6- (5-chlorobenzotriazol-2-yl) phenol, 2- ( 2H-benzotriazol-2-yl) -4- (1,1,3,3-tetrabutyl) phenol, 2,2'-methylenebis [6- (2H-benzotriazol-2-yl) -4- (1, 1,3,3-tetrabutyl) phenol], [methyl-3- [3-tert-butyl-5- (2H-benzotriazol-2-yl) -4-hydroxyphenyl] propionate-polyethylene glycol] condensate, etc. Can be mentioned. Two or more of these may be used in combination. Of the above, preferably 2- (2′-hydroxy-5′-tert-octylphenyl) benzotriazole, 2,2′-methylene-bis [4- (1,1,3,3-tetramethylbutyl) ) -6- (2N-benzotriazol-2-yl) phenol]. Specific examples of the benzophenone ultraviolet absorber include 2,4-dihydroxy-benzophenone, 2-hydroxy-4-methoxy-benzophenone, 2-hydroxy-4-n-octoxy-benzophenone, 2-hydroxy-4-dodecyloxy- Benzophenone, 2-hydroxy-4-octadecyloxy-benzophenone, 2,2'-dihydroxy-4-methoxy-benzophenone, 2,2'-dihydroxy-4,4'-dimethoxy-benzophenone, 2,2 ', 4 And 4'-tetrahydroxy-benzophenone. Specific examples of phenyl salicylate UV absorbers include phenyl salicylate and 4-tert-butyl-phenyl salicylate. Furthermore, as specific examples of the triazine ultraviolet absorber, 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol, 2- [4 , 6-bis (2,4-dimethylphenyl) -1,3,5-triazin-2-yl] -5- (octyloxy) phenol and the like. Specific examples of hindered amine ultraviolet absorbers include bis (2,2,6,6-tetramethylpiperidin-4-yl) sebacate.

  When added, the proportion of the ultraviolet absorber added is, for example, 0.01 parts by mass or more, preferably 0.1 parts by mass or more, and 3 parts by mass or less, preferably 1 with respect to 100 parts by mass of the polycarbonate resin. It is below mass parts. If the addition ratio of the UV absorber is too small, the effect of improving the weather resistance may be insufficient, and if the addition ratio of the UV absorber is too large, a mold deposit or the like is generated in the molded body, and a mold is formed at the time of molding. May cause contamination.

Examples of the release agent include release agents such as carboxylic acid esters, polysiloxane compounds, and paraffin wax (polyolefin type). Specifically, at least one compound selected from the group consisting of an aliphatic carboxylic acid, an ester of an aliphatic carboxylic acid and an alcohol, an aliphatic hydrocarbon compound having a number average molecular weight of 200 to 15,000, and a polysiloxane silicone oil. Can be mentioned. Examples of the aliphatic carboxylic acid include saturated or unsaturated aliphatic monovalent, divalent or trivalent carboxylic acid. Here, the aliphatic carboxylic acid includes an 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 the aliphatic carboxylic acid include palmitic acid, stearic acid, valeric acid, caproic acid, capric acid, lauric acid, arachidic acid, behenic acid, lignoceric acid, serotic acid, melissic acid, tetrariacontanoic acid, montanic acid, Examples include glutaric 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. On the other hand, examples of the alcohol include saturated or unsaturated monovalent or polyhydric alcohols. These alcohols may have a substituent such as a fluorine atom or an aryl group. Among these, a monovalent or polyvalent saturated alcohol having 30 or less carbon atoms is preferable, and an aliphatic saturated monohydric alcohol or polyhydric alcohol having 30 or less carbon atoms is more preferable. Here, the aliphatic includes alicyclic compounds. Specific examples of alcohols include octanol, decanol, dodecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, pentaerythritol, 2,2-dihydroxyperfluoropropanol, neopentylene glycol, ditrimethylolpropane, dipentaerythritol and the like. be able to. In addition, said ester compound may contain aliphatic carboxylic acid and / or alcohol as an impurity, and may be a mixture of a some compound. 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 Glycerol distearate, glycerol tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, pentaerythritol tetrastearate and the like. Examples of the aliphatic hydrocarbon having a number average molecular weight of 200 to 15,000 include liquid paraffin, paraffin wax, microwax, polyethylene wax, Fischer-Tropsch wax, and α-olefin oligomer having 3 to 12 carbon atoms. Here, the alicyclic hydrocarbon is also included in the aliphatic hydrocarbon. Moreover, these hydrocarbon compounds may be partially oxidized. Among these, paraffin wax, polyethylene wax, or a partial oxide of polyethylene wax is preferable, and paraffin wax and polyethylene wax are more preferable. The number average molecular weight is preferably 200 to 5,000. These aliphatic hydrocarbons may be a single substance or a mixture of components and various molecular weights as long as the main component is within the above range. Examples of the polysiloxane silicone oil include dimethyl silicone oil, phenylmethyl silicone oil, diphenyl silicone oil, and fluorinated alkyl silicone. Two or more of these may be used in combination.
When added, the addition ratio of the release agent is preferably 0.001 parts by mass or more, more preferably 0.01 parts by mass or more, and 2 parts by mass or less, based on 100 parts by mass of the polycarbonate resin. Preferably it is 1 mass part or less. If the addition ratio of the mold release agent is too small, the effect of mold release at the time of molding may not be sufficient, and if the addition ratio of the mold release agent is too large, the hydrolysis resistance of the molded product will be reduced, during injection molding. There is a possibility that mold contamination will occur.

Examples of the dye / pigment as a colorant include inorganic pigments, organic pigments, and organic dyes. Examples of inorganic pigments include, for example, 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. Oxide pigments such as chrome brown, titanium cobalt green, cobalt green, cobalt blue, copper-chromium black, copper-iron black; chromic pigments such as yellow lead and molybdate orange; ferrocyans such as bitumen And pigments. Further, as organic pigments and organic dyes as colorants, for example, phthalocyanine dyes such as copper phthalocyanine blue and copper phthalocyanine green; azo dyes such as nickel azo yellow; thioindigo, perinone, perylene, quinacridone And condensed polycyclic dyes such as dioxazine, isoindolinone, and quinophthalone; quinoline, anthraquinone, heterocyclic, and methyl dyes. Of these, titanium oxide, carbon black, cyanine, quinoline, anthraquinone, phthalocyanine dyes and the like are preferable from the viewpoint of thermal stability. In addition, 1 type may contain the dye / pigment, and 2 or more types may contain it by arbitrary combinations and a ratio. In addition, dyes and pigments may be used as masterbatches with polystyrene resins, polycarbonate resins, and acrylic resins for the purpose of improving handling during extrusion and improving dispersibility in the resin composition. Good.
When added, the proportion of the colorant added is, for example, 5 parts by mass or less, preferably 3 parts by mass or less, more preferably 2 parts by mass or less with respect to 100 parts by mass of the polycarbonate resin. If the ratio of the colorant added is too large, the impact resistance of the molded product may be insufficient.

[Production method of polycarbonate resin]
The polycarbonate resin contained in the molded article of the present invention can be synthesized based on a known method, for example, various synthesis including interfacial polymerization method, pyridine method, transesterification method, ring-opening polymerization method of cyclic carbonate compound. A method can be mentioned. Specifically, a linear thermoplastic polycarbonate polymer is obtained by reacting a dihydroxy compound with a carbonate ester-forming compound. Moreover, when the said polyhydroxy compound and a polyfunctional compound are used together, the copolymer of a branched thermoplastic polycarbonate is obtained.

  In the reaction by the interfacial polymerization method, in the presence of an organic solvent inert to the reaction, an alkaline aqueous solution, the pH is usually kept at 10 or more, an aromatic dihydroxy compound and a terminal terminator, and if necessary, an aromatic dihydroxy compound A polycarbonate resin can be obtained by reacting with phosgene using an antioxidant for the prevention of oxidation, and then adding a polymerization catalyst such as a tertiary amine or a quaternary ammonium salt and conducting interfacial polymerization. . The addition of the end terminator is not particularly limited as long as it is from the time of phosgenation to the start of the polymerization reaction. The reaction temperature is 0 to 35 ° C., and the reaction time is several minutes to several hours.

  Here, as the organic solvent inert to the reaction, chlorinated hydrocarbons such as dichloromethane, 1,2-dichloroethane, chloroform, monochlorobenzene, dichlorobenzene, aromatic hydrocarbons such as benzene, toluene, xylene, etc. Can be mentioned. As the terminal terminator, in addition to the compounds listed above, a compound having a monovalent phenolic hydroxyl group can be used in combination as long as the effects of the present invention are not impaired. As a polymerization catalyst, tertiary amines such as trimethylamine, triethylamine, tributylamine, tripropylamine, trihexylamine, pyridine; quaternary ammonium salts such as trimethylbenzylammonium chloride, tetramethylammonium chloride, triethylbenzylammonium chloride, etc. Can be mentioned.

  The flakes of polycarbonate resin obtained by the above method can be obtained, for example, by dropping a dichloromethane solution containing the polycarbonate resin obtained by the interfacial polymerization method into warm water kept at 45 ° C. and evaporating and removing the solvent. Alternatively, a dichloromethane solution containing a polycarbonate resin obtained by an interfacial polymerization method can be poured into methanol, and the precipitated polymer can be obtained by filtration and drying, or obtained by an interfacial polymerization method. The obtained dichloromethane solution containing the polycarbonate resin can be obtained by stirring and grinding while stirring at 40 ° C. with a kneader and then removing the solvent with hot water at 95 ° C. or higher.

  The reaction by the transesterification method is a transesterification reaction between a carbonic acid diester and a dihydroxy compound. Usually, the molecular weight and terminal hydroxyl group amount of the desired polycarbonate resin are determined by adjusting the mixing ratio of the carbonic acid diester and the aromatic dihydroxy compound or adjusting the degree of vacuum during the reaction. The amount of terminal hydroxyl groups has a great influence on the thermal stability, hydrolysis stability, color tone, etc. of the polycarbonate resin, and is preferably 1,000 ppm or less, more preferably 700 ppm, in order to have practical physical properties. It is as follows. It is common to use an equimolar amount or more of a carbonic acid diester with respect to 1 mol of the dihydroxy compound, and preferably 1.01 to 1.30 mol.

When synthesizing a polycarbonate resin by the transesterification method, a transesterification catalyst is usually used. The transesterification catalyst is not particularly limited, but alkali metal compounds and / or alkaline earth metal compounds are mainly used, and supplementary basic boron compounds, basic phosphorus compounds, basic ammonium compounds, or amine-based catalysts It is also possible to use a basic compound such as a compound in combination. In the transesterification reaction using such raw materials, a mixture of dihydric phenol, monohydric phenol (end terminator), and carbonic acid diester is supplied to the reactor under melting and reacted at a temperature of 100 to 320 ° C. And a method of finally performing a melt polycondensation reaction while removing by-products such as aromatic hydroxy compounds under a reduced pressure of 2.7 × 10 ² Pa ( ² mmHg) or less. The melt polycondensation can be carried out batchwise or continuously, but the polycarbonate resin used in the present invention is preferably carried out continuously from the viewpoint of stability and the like. In the transesterification method, it is preferable to use a compound that neutralizes the catalyst, for example, a sulfur-containing acidic compound, or a derivative formed therefrom, as a catalyst deactivator in the polycarbonate resin. It is in the range of 0.5 to 10 equivalents, preferably 1 to 5 equivalents with respect to the alkali metal, and is usually added in the range of 1 to 100 ppm, preferably 1 to 20 ppm with respect to the polycarbonate resin.

  The polycarbonate resin contained in the injection molded article for the light guide plate of the present invention may be added with various additives at an arbitrary ratio, and a known strand-type cold cut method (a polycarbonate resin composition once melted is a strand) Molded into a shape, cooled, then cut into a predetermined shape and pelletized), hot-cut method in the air hot-cut method (polycarbonate resin once melted into pellets before being exposed to water in the air) Polycarbonate resin pellets can be obtained by a hot-cut method using a hot-cut method in water (a method in which a polycarbonate resin once melted is cut in water and simultaneously cooled and pelletized). The obtained polycarbonate resin pellet is preferably dried based on a method such as drying using a hot air drying furnace, a vacuum drying furnace, or a dehumidifying drying furnace.

[Evaluation method]
<Molecular weight>
The molecular weight of the polycarbonate resin contained in the molded product of the present invention is evaluated by the viscosity average molecular weight (Mv) measured under the following conditions using an Ubbelohde viscometer.

<Viscosity average molecular weight (Mv) measurement conditions>
Measuring instrument: Ubbelohde capillary viscometer Solvent: dichloromethane resin solution concentration: 0.5 g / deciliter Measuring temperature: 25 ° C
Measured under the above conditions, the intrinsic viscosity [η] deciliter / gram is obtained with a Huggins constant of 0.45, and is calculated by the following mathematical formula (II).

  The viscosity average molecular weight (Mv) of the polycarbonate resin contained in the injection molded article for the light guide plate of the present invention is 13,000 or more and 18,000 or less. The viscosity average molecular weight (Mv) is preferably 14,000 or more and 18,000 or less, more preferably the viscosity average molecular weight (Mv) is 15,000 or more and 18,000 or less, and particularly preferably the viscosity average molecular weight (Mv). Is 15,000 or more and 17,000 or less. When the viscosity average molecular weight (Mv) is 13,000 or more, the mechanical strength is improved. When the viscosity average molecular weight (Mv) is 18,000 or less, the melt viscosity is lowered and the fluidity is improved, and it is easy to form a thin-walled / large-sized molded product. become.

<Capacity flow rate (Q value)>
The melt fluidity of the polycarbonate resin contained in the injection molded article for the light guide plate of the present invention is evaluated by a capacity flow rate (Q value) measured under the following conditions using a Koka flow tester. A high Q value indicates a high melt fluidity, and a low Q value indicates a low melt fluidity.

<Q value measurement conditions>
Measuring device: Flow characteristic evaluation device Flow tester Load: 160 kgf / cm ²
Orifice: 1mm diameter x 10mm length
Measurement temperature: 240 ° C
For example, Shimadzu Corporation CFT-500D can be used for the test.

The Q value of the polycarbonate resin contained in the injection molded article for a light guide plate of the present invention measured under the above measurement conditions is preferably 10 × 10 ⁻² cc / sec or more, more preferably 13 × at a measurement temperature of 240 ° C. It is 10 ⁻² cc / sec or more, particularly preferably 15 × 10 ⁻² cc / sec or more, and most preferably 19 × 10 ⁻² cc / sec or more. By setting it as such a range, a thin and large-sized molded object can be molded. The production stability of the injection molded body for the light guide plate is improved, and the energy consumption during the production of the molded body can be suppressed. On the other hand, when the above Q value is less than 10 × 10 ⁻² cc / sec, the melt fluidity becomes low, so it is necessary to mold the light guide plate under a higher temperature condition than usual, which increases the energy consumption, Tends to break down. The Q value is preferably 100 × 10 ⁻² cc / sec or less, and more preferably 80 × 10 ⁻² cc / sec or less. When the Q value is 100 × 10 ⁻² cc / sec or less, there is a tendency that molding defects such as sprue breakage and voids can be more effectively prevented.

<Measurement conditions for glass transition temperature>
Measuring instrument: Differential scanning calorimeter (DSC)
Heating rate: 10 ° C./min Gas flow environment: Nitrogen 20 ml / min Sample pretreatment: 300 ° C. For example, a differential scanning calorimeter (DSC) DSC-50 manufactured by Shimadzu Corporation may be used. it can.

  The glass transition temperature of the polycarbonate resin contained in the molded article of the present invention is preferably 90 ° C. or higher, more preferably 95 ° C. or higher, and particularly preferably 100 ° C. or higher. By setting it as such a range, the product excellent in heat resistance is obtained. When the glass transition temperature is 90 ° C. or higher, it is possible to more effectively prevent the polycarbonate resin powder from agglomerating in the granulation and drying steps in the production of the polycarbonate resin and significantly reducing the productivity. .

<Izod impact strength>
The impact resistance of the polycarbonate resin contained in the molded article of the present invention is evaluated by Izod impact strength based on ASTM-D256. For the test, for example, an Izod impact tester manufactured by Toyo Seiki Seisakusho can be used.

  The Izod impact strength of the molded article of the present invention is preferably 30 J / m or more, more preferably 50 J / m or more, and particularly preferably 80 J / m or more. By setting it as such a range, the crack of a molded object at the time of shaping | molding or after shaping | molding and crack generation | occurrence | production can be prevented more effectively.

[Use]
The injection-molded article for a light guide plate of the present invention has excellent impact resistance compared to conventional molded articles and can be easily increased in size, so that it can be used for liquid crystal backlight units, various display devices, and illumination devices. It can be suitably used as a light guide plate. Examples of such devices include mobile terminals such as mobile phones, mobile notebooks, netbooks, slate PCs, tablet PCs, smartphones, tablet terminals, cameras, watches, notebook computers, various displays, lighting devices, and the like. . According to one aspect of the present invention, a light guide plate containing the molded article of the present invention as a member is provided.

[Molding method]
The manufacturing method of the injection-molded article for the light guide plate of the present invention is not particularly limited, and a molding method generally adopted for the polycarbonate resin can be arbitrarily adopted. Examples include melt injection molding, ultra-high-speed injection molding, injection compression molding, two-color molding, hollow molding such as gas assist, molding using a heat insulating mold, and rapid heating mold. Examples of the molding method, extrusion molding method, sheet molding method, thermoforming method, rotational molding method, laminate molding method, and press molding method. A molding method using a hot runner method can also be used. Particularly preferred is a melt injection molding method.

  EXAMPLES Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited to a following example, unless the summary is exceeded. The raw materials and evaluation methods used in the following examples are as follows.

<Measurement of molecular weight>
The molecular weight of the polycarbonate resin contained in the molded product obtained in this example was evaluated by the viscosity average molecular weight (Mv) measured under the following conditions using an Ubbelohde viscometer.

<Viscosity average molecular weight (Mv) measurement conditions>
Measuring instrument: Ubbelohde capillary viscometer Solvent: dichloromethane resin solution concentration: 0.5 g / deciliter Measuring temperature: 25 ° C
It measured on the said conditions, calculated | required intrinsic viscosity [(eta)] deciliter / gram with the Huggins constant of 0.45, and computed by following numerical formula (II).

<Formability evaluation>
Using an injection molding machine (“HSP100A” manufactured by Sodick), a light guide plate type test piece having a resin temperature of 340 ° C. and a mold temperature of 80 ° C. and a thickness of 3.5 inches and a thickness of 0.4 mm is formed. The molded body was evaluated based on the deformation of the product and the presence or absence of cracks.

<Q value measurement conditions>
Measuring device: Flow characteristic evaluation device Flow tester Load: 160 kgf / cm ²
Orifice: 1mm diameter x 10mm length
Measurement temperature: 240 ° C
Measuring instrument: Shimadzu Corporation CFT-500D

<Measurement conditions for glass transition temperature>
Measuring instrument: Differential scanning calorimeter (DSC)
Heating rate: 10 ° C./min Gas flow environment: Nitrogen 20 ml / min Sample pretreatment: 300 ° C. Heating and melting measuring instrument: Differential scanning calorimeter (DSC) DSC-50 manufactured by Shimadzu Corporation

<Izod impact strength>
The impact resistance of the molded article of the present invention was evaluated based on the Izod impact strength with a notch based on STM-D256.
Measuring equipment: Izod impact tester manufactured by Toyo Seiki Seisakusho

(Production of terminal terminator)
<Production Example 1>
Based on the description on pages 143 to 150 of the Organic Chemistry Handbook (3rd edition: Synthetic Organic Chemistry Association: Issued by Technical Hall), 4-hydroxybenzoic acid manufactured by Tokyo Chemical Industry Co., Ltd. and Tokyo Chemical Industry Co., Ltd. 1-Butanol was used for esterification by dehydration reaction to obtain butyl parahydroxybenzoate (terminal stopper 1).

<Production Example 2>
Parahydroxybenzoic acid 2-ethylhexyl ester (terminal stopper 2) was obtained in the same manner as in Production Example 1 except that 1-butanol was changed to 2-ethylhexanol manufactured by Mitsubishi Chemical Corporation.

<Production Example 3>
Parahydroxybenzoic acid hexadecyl ester (terminal stopper 3) was obtained in the same manner as in Production Example 1 except that 1-butanol was changed to 1-hexadecanol manufactured by Tokyo Chemical Industry Co., Ltd.

<Production Example 4>
Parahydroxybenzoic acid docosyl ester (terminal stopper 4) was obtained in the same manner as in Production Example 1 except that 1-butanol was changed to 1-docosanol manufactured by Tokyo Chemical Industry Co., Ltd.

<Production Example 5>
Parahydroxybenzoic acid tetracosyl ester (terminal stopper 5) was obtained in the same manner as in Production Example 1 except that 1-butanol was changed to 1-tetracosanol manufactured by Tokyo Chemical Industry Co., Ltd.

[Production of injection molded article for light guide plate containing polycarbonate resin]
<Example 1>
To 57.2 kg of a 9 w / w% aqueous sodium hydroxide solution, 7.1 kg (31.14 mol) of bisphenol A (BPA) manufactured by Nippon Steel & Sumikin Chemical Co., Ltd. and 30 g of hydrosulfite were added and dissolved. To this, 40 kg of dichloromethane was added, and while stirring, 4.33 kg of phosgene was blown in over 30 minutes while maintaining the solution temperature in the range of 15 ° C to 25 ° C.

  After the completion of phosgene blowing, a solution prepared by dissolving 628 g (2.51 mol) of the above-mentioned terminator 2 in 6 kg of a 9 w / w% aqueous sodium hydroxide solution, 11 kg of dichloromethane, and 10 kg of dichloromethane was added, and the mixture was vigorously stirred and emulsified. Thereafter, 10 ml of triethylamine was added as a polymerization catalyst, and the mixture was polymerized for about 40 minutes.

  The polymerization solution was separated into an aqueous phase and an organic phase, the organic phase was neutralized with phosphoric acid, and washing with pure water was repeated until the pH of the washing solution became neutral. The polycarbonate resin powder was obtained by evaporating the organic solvent from the purified polycarbonate resin solution.

  The obtained polycarbonate resin powder was melt kneaded at a cylinder temperature of 240 ° C. with a single screw extruder with a screw diameter of 40 mm (“VS-40” manufactured by Tanabe Plastic Machinery Co., Ltd.), and pellets were obtained by strand cutting.

As a result of measuring viscosity average molecular weight, glass transition point, and Q value using the obtained polycarbonate resin pellets, viscosity average molecular weight 18,000, glass transition point (Tg) 125 ° C., Q value 10 × 10 ⁻² cc / Sec.

  The obtained pellets were dried at 100 ° C. for 5 to 7 hours with a hot-air circulating dryer, and then the resin temperature was 300 ° C. and the mold temperature was 80 ° C. using an injection molding machine (“C-Mobile” manufactured by Shinsei Servic). A test piece for Izod impact test was molded, and an Izod impact test with a notch was performed according to ASTM D256.

  As a result of measuring Izod impact strength, it was 450 J / m.

  Further, by using the obtained dried pellets, a light guide plate type test piece having a resin temperature of 340 ° C., a mold temperature of 80 ° C., and a thickness of 0.4 mm was injected by an injection molding machine (“HSP100A” manufactured by Sodick) Molded. At that time, formability was confirmed with respect to insufficient filling and deformation / cracking of the molded body. A case where a good molded body was obtained without any problem in formability was designated as “◯”, and a case where a problem occurred and was poor was designated as “X”.

  The moldability was good.

<Example 2>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that the amount of the terminal stopper 2 was changed to 643 g (2.57 mol).

The obtained polycarbonate resin has a viscosity average molecular weight of 16,500, a glass transition point (Tg) of 120 ° C., a Q value of 15 × 10 ⁻² cc / sec, an Izod impact strength of 190 J / m, and a good moldability. Met.

<Example 3>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that the amount of the terminal stopper 2 was changed to 818 g (3.27 mol).

The obtained polycarbonate resin has a viscosity average molecular weight of 15,000, a glass transition point (Tg) of 118 ° C., a Q value of 27 × 10 ⁻² cc / sec, an Izod impact strength of 200 J / m, and a good moldability. Met.

<Example 4>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that the amount of the terminal stopper 2 was changed to 943 g (3.77 mol).

The resulting polycarbonate resin has a viscosity average molecular weight of 13,000, a glass transition point (Tg) of 99 ° C., a Q value of 70 × 10 ⁻² cc / sec, an Izod impact strength of 50 J / m, and a good moldability. Met.

<Example 5>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that 628 g (2.51 mol) of the terminal stopper 2 was changed to 897 g (2.47 mol) of the terminal stopper 3.

The obtained polycarbonate resin has a viscosity average molecular weight of 18,000, a glass transition point (Tg) of 115 ° C., a Q value of 20 × 10 ⁻² cc / sec, an Izod impact strength of 350 J / m, and a good moldability. Met.

<Example 6>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that 628 g (2.51 mol) of the terminal stopper 2 was changed to 1143 g (3.15 mol) of the terminal stopper 3.

The obtained polycarbonate resin has a viscosity average molecular weight of 15,000, a glass transition point (Tg) of 104 ° C., a Q value of 35 × 10 ⁻² cc / sec, an Izod impact strength of 180 J / m, and a good moldability. Met.

<Example 7>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that 628 g (2.51 mol) of the terminal stopper 2 was changed to 1310 g (3.61 mol) of the terminal stopper 3.

The obtained polycarbonate resin has a viscosity average molecular weight of 13,000, a glass transition point (Tg) of 95 ° C., a Q value of 57 × 10 ⁻² cc / sec, an Izod impact strength of 50 J / m, and a good moldability. Met.

<Example 8>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that 628 g (2.51 mol) of the terminal stopper 2 was changed to 1565 g (3.51 mol) of the terminal stopper 4.

The resulting polycarbonate resin has a viscosity average molecular weight of 18,000, a glass transition point (Tg) of 110 ° C., a Q value of 19 × 10 ⁻² cc / sec, an Izod impact strength of 300 J / m, and a good moldability. Met.

<Example 9>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that 628 g (2.51 mol) of the terminal stopper 2 was changed to 1717 g (3.85 mol) of the terminal stopper 4.

The resulting polycarbonate resin has a viscosity average molecular weight of 16,000, a glass transition point (Tg) of 101 ° C., a Q value of 35 × 10 ⁻² cc / sec, an Izod impact strength of 190 J / m, and a good moldability. Met.

<Example 10>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that 628 g (2.51 mol) of the terminal stopper 2 was changed to 2130 g (4.78 mol) of the terminal stopper 4.

The obtained polycarbonate resin has a viscosity average molecular weight of 13,000, a glass transition point (Tg) of 90 ° C., a Q value of 70 × 10 ⁻² cc / sec, an Izod impact strength of 50 J / m, and a good moldability. Met.

<Comparative Example 1>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that 628 g (2.51 mol) of the terminal stopper 2 was changed to 448 g (2.31 mol) of the terminal stopper 1.

The resulting polycarbonate resin has a viscosity average molecular weight of 15,000, a glass transition point (Tg) of 128 ° C., a Q value of 9 × 10 ⁻² cc / sec, an Izod impact strength of 230 J / m, and poor moldability. Met.

<Comparative example 2>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that the amount of the terminal stopper 2 was changed to 291 g (1.16 mol).

The resulting polycarbonate resin has a viscosity average molecular weight of 24,000, a glass transition point (Tg) of 138 ° C., a Q value of 1 × 10 ⁻² cc / sec, an Izod impact strength of 700 J / m, and poor moldability. Met.

<Comparative Example 3>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that the amount of the terminal stopper 2 was changed to 1171 g (4.69 mol).

The resulting polycarbonate resin has a viscosity average molecular weight of 10,000, a glass transition point (Tg) of 85 ° C., a Q value of 104 × 10 ⁻² cc / sec, an Izod impact strength of 10 J / m, and poor moldability. Met.

<Comparative Example 4>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that 628 g (2.51 mol) of the terminal stopper 2 was changed to 730 g (2.01 mol) of the terminal stopper 3.

The resulting polycarbonate resin has a viscosity average molecular weight of 20,000, a glass transition point (Tg) of 119 ° C., a Q value of 9 × 10 ⁻² cc / sec, an Izod impact strength of 530 J / m, and poor moldability. Met.

<Comparative Example 5>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that 628 g (2.51 mol) of the terminal stopper 2 was changed to 1775 g (4.89 mol) of the terminal stopper 3.

The resulting polycarbonate resin has a viscosity average molecular weight of 10,000, a glass transition point (Tg) of 71 ° C., a Q value of 93 × 10 ⁻² cc / sec, an Izod impact strength of 10 J / m, and poor moldability. Met.

<Comparative Example 6>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that 628 g (2.51 mol) of the terminal stopper 2 was changed to 1267 g (2.84 mol) of the terminal stopper 4.

The obtained polycarbonate resin has a viscosity average molecular weight of 22,000, a glass transition point (Tg) of 117 ° C., a Q value of 4 × 10 ⁻² cc / sec, an Izod impact strength of 650 J / m, and poor moldability. Met.

<Comparative Example 7>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that 628 g (2.51 mol) of the terminal stopper 2 was changed to 2163 g (4.85 mol) of the terminal stopper 4.

The resulting polycarbonate resin has a viscosity average molecular weight of 10,000, a glass transition point (Tg) of 80 ° C., a Q value of 90 × 10 ⁻² cc / sec, an Izod impact strength of 10 J / m, and poor moldability. Met.

<Comparative Example 8>
A polycarbonate resin pellet and a molded body were obtained in the same manner as in Example 1 except that 628 g (2.51 mol) of the terminal stopper 2 was changed to 1824 g (3.85 mol) of the terminal stopper 5.

The resulting polycarbonate resin has a viscosity average molecular weight of 16,000, a glass transition point (Tg) of 85 ° C., a Q value of 36 × 10 ⁻² cc / sec, an Izod impact strength of 180 J / m, and poor moldability. Met.

By including a polycarbonate resin excellent in fluidity and impact strength as described above, an injection molded article for a light guide plate having good impact resistance could be provided.

  The molded body containing the polycarbonate resin of the present invention has high fluidity of the resin and can be suitably used as an injection molded body for a light guide plate that requires impact resistance, and has very high industrial applicability.

The present invention includes the following aspects.
<1> An injection molded article for a light guide plate containing a polycarbonate resin obtained by reacting a monohydric phenol represented by the following general formula (1a) as a terminal terminator.

(In the formula, R ₁ represents an alkyl group having ₅ to 23 carbon atoms or an alkenyl group having 8 to 36 carbon atoms. R _{2 to} R ₅ may each independently have hydrogen, halogen, or a substituent. It represents any one of the group consisting of a good alkyl group having 1 to 20 carbon atoms and an aryl group having 6 to 12 carbon atoms which may have a substituent.)
<2> The molded article according to <1>, wherein the polycarbonate resin contains a structural unit represented by the following general formula (2).
(In the formula, R _{6 to} R ₁₃ are each independently hydrogen, halogen, an optionally substituted alkoxyl group having 1 to 5 carbon atoms, or an optionally substituted alkyl group having 1 to 20 carbon atoms. Group, an optionally substituted alkoxy group having 1 to 5 carbon atoms, an optionally substituted aryl group having 6 to 12 carbon atoms, and an optionally substituted group having 7 to 17 carbon atoms It represents one of a group consisting of an aralkyl group and an alkenyl group having 2 to 15 carbon atoms which may have a substituent, and X represents a single bond, —O—, —S—, —SO—, —SO _2. The structure is any one selected from the group consisting of-, -CO-, and the following general formulas (3) to (6).
(Wherein R ₁₄ and R ₁₅ are each independently hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms, or an optionally substituted alkoxy group having 1 to 5 carbon atoms. , An aryl group having 6 to 12 carbon atoms that may have a substituent, an alkenyl group having 2 to 5 carbon atoms that may have a substituent, and 7 to 17 carbon atoms that may have a substituent Represents any one of the group consisting of aralkyl groups, c represents an integer of 1-20)
(In the formula, R ₁₆ and R ₁₇ are each independently hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms, or an optionally substituted alkoxy group having 1 to 5 carbon atoms. , An aryl group having 6 to 12 carbon atoms which may have a substituent, an alkenyl group having 2 to 5 carbon atoms which may have a substituent, and an aralkyl having 7 to 17 carbon atoms which may have a substituent It represents one of the group consisting of groups, and R ₁₆ and R ₁₇ may be bonded to each other to form a carbocyclic or heterocyclic ring having 1 to 20 carbon atoms.
(Wherein R _{18 to} R ₂₁ are each independently hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms, or an optionally substituted alkoxy group having 1 to 5 carbon atoms. , An aryl group having 6 to 12 carbon atoms which may have a substituent, an alkenyl group having 2 to 5 carbon atoms which may have a substituent, and an aralkyl having 7 to 17 carbon atoms which may have a substituent It represents one of the group consisting of groups, and R ₁₈ and R ₁₉ and R ₂₀ and R ₂₁ may be bonded to each other to form a carbocyclic or heterocyclic ring having 1 to 20 carbon atoms.
(In formula, R < ₂₂ > -R < ₃₁ > is a hydrogen atom or a C1-C3 alkyl group each independently.
<3> The molded article according to <1> or <2>, wherein the polycarbonate resin has a viscosity average molecular weight of 13,000 to 18,000.
<4> The molded body according to any one of <1> to <3>, wherein the general formula (1a) is the following general formula (8a).
(In the formula, R ₁ is an alkyl group having 5 to 23 carbon atoms.)
<5> The molded article according to <4>, wherein R ₁ in the general formula (8a) is at _{least one} of the group consisting of a 2-ethylhexyl group, a 2-hexyldecyl group, and a hexadecyl group.
<6> The molded product according to any one of <2> to <5>, wherein X in the general formula (2) is the general formula (3).
<7> The molded product according to any one of <1> to <6>, wherein the polycarbonate resin has a Q value of 10 × 10 ⁻² cc / sec or more.
<8> The molded article according to any one of <1> to <7>, wherein the polycarbonate resin has an Izod impact strength of 30 J / m or more.
<9> The molded article according to any one of <1> to <8>, wherein the polycarbonate resin has a glass transition temperature of 90 ° C. or higher.
<10> A light guide plate containing the molded article according to any one of <1> to <9> as a member.

Claims (9)

An injection-molded article for a light guide plate having a terminal structure represented by the following general formula (1) and containing a polycarbonate resin having a viscosity average molecular weight of 13,000 to 18,000.
(Where
R ₁ represents an alkyl group having 5 to 23 carbon atoms or an alkenyl group having 8 to 36 carbon atoms,
R _{2 to} R ₅ are each independently a group consisting of hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms and an optionally substituted aryl group having 6 to 12 carbon atoms. Any one of ) The molded article according to claim 1, wherein the polycarbonate resin contains a structural unit represented by the following general formula (2).
(Where
R _{6 to} R ₁₃ are each independently hydrogen, halogen, an optionally substituted alkoxy group having 1 to 5 carbon atoms, an optionally substituted alkyl group having 1 to 20 carbon atoms, or a substituent. An alkoxy group having 1 to 5 carbon atoms, an aryl group having 6 to 12 carbon atoms that may have a substituent, an aralkyl group having 7 to 17 carbon atoms that may have a substituent, and a substituent Any one of the group consisting of alkenyl groups having 2 to 15 carbon atoms which may have a group;
X is a structure selected from the group consisting of a single bond, —O—, —S—, —SO—, —SO ₂ —, —CO—, and the following general formulas (3) to (6). )
(Where
R ₁₄ and R ₁₅ each independently represents hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms, an optionally substituted alkoxy group having 1 to 5 carbon atoms, or a substituent. It consists of an aryl group having 6 to 12 carbon atoms which may have, an alkenyl group having 2 to 5 carbon atoms which may have a substituent, and an aralkyl group having 7 to 17 carbon atoms which may have a substituent. Represents one of the groups,
c represents an integer of 1 to 20. )
(In the formula, R ₁₆ and R ₁₇ are each independently hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms, or an optionally substituted alkoxy group having 1 to 5 carbon atoms. , An aryl group having 6 to 12 carbon atoms which may have a substituent, an alkenyl group having 2 to 5 carbon atoms which may have a substituent, and an aralkyl having 7 to 17 carbon atoms which may have a substituent It represents one of the group consisting of groups, and R ₁₆ and R ₁₇ may be bonded to each other to form a carbocyclic or heterocyclic ring having 1 to 20 carbon atoms.
(Wherein R _{18 to} R ₂₁ are each independently hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms, or an optionally substituted alkoxy group having 1 to 5 carbon atoms. , An aryl group having 6 to 12 carbon atoms which may have a substituent, an alkenyl group having 2 to 5 carbon atoms which may have a substituent, and an aralkyl having 7 to 17 carbon atoms which may have a substituent It represents one of the group consisting of groups, and R ₁₈ and R ₁₉ and R ₂₀ and R ₂₁ may be bonded to each other to form a carbocyclic or heterocyclic ring having 1 to 20 carbon atoms.
(In formula, R < ₂₂ > -R < ₃₁ > is a hydrogen atom or a C1-C3 alkyl group each independently.) The molded body according to claim 1 or 2, wherein the terminal structure has a structure represented by the following general formula (8).
(In the formula, R ₁ is an alkyl group having 5 to 23 carbon atoms.) The molded product according to claim 3, wherein R ₁ in the general formula (8) is at _{least one} of a group consisting of a 2-ethylhexyl group, a 2-hexyldecyl group, a hexadecyl group, and a docosyl group.   The molded body according to any one of claims 2 to 4, wherein X in the general formula (2) has a structure of the general formula (3). The molded product according to any one of claims 1 to 5, wherein the polycarbonate resin has a Q value of 10 x ^10-2 cc / sec or more.   The molded article according to any one of claims 1 to 6, wherein the polycarbonate resin has an Izod impact strength of 30 J / m or more.   The molded article according to any one of claims 1 to 7, wherein the polycarbonate resin has a glass transition temperature of 90 ° C or higher. The light-guide plate which contains the molded object as described in any one of Claims 1-8 as a member.