JP6729560B2 - Molded body for light guide plate - Google Patents

Description

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

2. Description of the Related Art In recent years, in various mobile terminals such as smartphones and tablet type terminals, liquid crystal displays are becoming thinner and larger in size at a remarkable speed. Along with this, as a method of entering light into the light guide plate, an edge type in which the side edge is performed from the direct type to the side edge is often adopted, and sufficient brightness and further strength are required as an ultra-thin light source.

Further, 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 a load applied by an input pen or a finger, cracks or crazes will occur in the light guide plate, and the fine projections on the upper surface of the light guide plate will be damaged.
As a result, the damaged portion emits bright light when turned on, and the visibility of the liquid crystal display is significantly reduced. In order to prevent such damage, it is important to improve the strength of the light guide plate. Particularly in a liquid crystal display having a large screen, bending due to a load at the time of input is likely to occur, so it is extremely important to improve the impact resistance strength of the light guide plate.

In general, when a large and thin molded body is manufactured 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 product becomes insufficient, and the molded product is likely to crack during mold release. Therefore, there is a limit in improving the fluidity of the resin by reducing the molecular weight.
Further, in the case of a thermoplastic resin obtained from the same structural unit, a lower glass transition temperature (Tg) tends to result in a molded article having excellent fluidity and transferability. However, if Tg is too low, it becomes impossible to obtain an injection-molded article having excellent heat resistance.

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

However, with the recent widespread use of optical materials, impact resistance may be insufficient in BPA-PC. Therefore, there is a strong demand for the development of a large and thin injection molded body for a light guide plate with improved impact resistance. ing.

JP-A-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 a terminal stopper while leaving the main skeleton as it is of bisphenol A type. A substrate is disclosed. However, in Patent Documents 1 to 3, there is no description about a light guide plate using a polycarbonate resin, and the resins described in these documents have sufficient impact resistance strength to be used as a large light guide plate. You may not have done it.
Patent Document 4 proposes a light guide plate using a polycarbonate resin having a long-chain alkyl group as an end group and having improved fluidity. However, larger size requires further improvement in fluidity, and there is room for improvement in impact resistance.
Patent Document 5 proposes a substrate for an optical information recording medium in which a heat-resistant discoloration is improved by using a polycarbonate resin having a long-chain alkyl group as an end group. There was room to further improve the transferability.

An object of the present invention is to provide a molded article for a light guide plate, which contains a polycarbonate resin and has excellent impact resistance.

The present inventors, as a result of earnest studies, 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 present invention has been accomplished by finding that it has excellent impact resistance and can be a large-sized molded product.
That is, the present invention relates to an injection molded body for a light guide plate, which contains the following polycarbonate resin.
<1> An injection-molded article for a light guide plate, which has a terminal structure represented by the following general formula (1) and contains a polycarbonate resin having a viscosity average molecular weight of 13,000 to 18,000.
(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 are each independently a group consisting of hydrogen, halogen, an alkyl group having 1 to 20 carbon atoms which may have a substituent and an aryl group having 6 to 12 carbon atoms which may have a substituent. Represents one of the above. )
<2> The molded product 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 alkoxyl group having 1 to 5 carbon atoms which may have a substituent, an alkyl group having 1 to 20 carbon atoms which may have a substituent, and a substituent. 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 aralkyl group having 7 to 17 carbon atoms which may have a substituent, and a substituent. Represents any one of a group consisting of an alkenyl group having 2 to 15 carbon atoms which may have a group,
X is a single bond, -O -, - S -, - SO -, - SO 2 -, - CO- and the following general formula (3) to (6) of the group consisting of is any structure. )
(In the formula,
R ₁₄ and R ₁₅ each independently represent hydrogen, halogen, an alkyl group having 1 to 20 carbon atoms which may have a substituent, an alkoxy group having 1 to 5 carbon atoms which may have a substituent, and a substituent. It comprises 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 alkyl group having 1 to 20 carbon atoms which may have a substituent, an alkoxy group having 1 to 5 carbon atoms which may have a substituent. 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. R ₁₆ and R ₁₇ may be bonded to each other to form a carbocycle or heterocycle having 1 to 20 carbon atoms.
(In the formula, R _{18 to} R ₂₁ are each independently hydrogen, halogen, an alkyl group having 1 to 20 carbon atoms which may have a substituent, an alkoxy group having 1 to 5 carbon atoms which may have a substituent. 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. represents either of the group consisting of _{radicals, R 18} and _{R 19} and _{R 20} and _{R 21} are combined with each other, they may form a carbocyclic or heterocyclic ring having 1 to 20 carbon atoms.)
_(Wherein, R 22 _{to R 31} are each independently a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.)
<3> The molded product according to <1> or <2>, in which 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 selected} from the group consisting of a 2-ethylhexyl group, a 2-hexyldecyl group, a hexadecyl group, and a docosyl group. body.
<5> The molded product 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 product according to any one of <1> to <7>, in which the glass transition temperature of the polycarbonate resin is 90° C. or higher.
<9> A light guide plate containing the molded product according to any one of <1> to <8> as a member.

The light guide plate injection molded body of the present invention has excellent impact resistance as compared with the conventional molded body, and can be easily increased in size. In addition, the molded product of the present invention can maintain the characteristics required for the liquid crystal light guide plate (for example, impact resistance, transferability, heat resistance, transparency, and hue) while maintaining the original characteristics of the polycarbonate resin. It is suitable for thin and large-sized optical materials, especially as an injection molded body for a light guide plate.

Next, an example of an embodiment of the present invention will be described, but the present 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 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 alkyl group having 1 to 20 carbon atoms which may have a substituent and an aryl group having 6 to 12 carbon atoms which may have a substituent. Represents one of the above. Here, the substituents are each independently halogen, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms.

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

The polycarbonate resin is obtained by polymerizing using a dihydroxy compound and a carbonic acid ester forming compound, and stopping the reaction with a terminal terminating agent represented by the general formula (1a).
The respective raw materials of the polycarbonate resin will be described in detail below.

<Dihydroxy compound>
The dihydroxy compound used in the polycarbonate resin contained in the light guide plate injection molded article 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 resulting molded article, The dihydric phenol represented by the general formula (7) is preferable from the viewpoints of high purity and large amount of distribution. By using such a dihydric phenol, the obtained polycarbonate resin has the structural unit represented by the general formula (2).

In the general formula (7), R _{6 to} R ₁₃ are each independently hydrogen, halogen, an alkoxyl group having 1 to 5 carbon atoms which may have a substituent, or 1 to 1 carbon atoms which may have a substituent. An alkyl group having 20 carbon atoms, an alkoxy group having 1 to 5 carbon atoms which may have a substituent, an aryl group having 6 to 12 carbon atoms which may have a substituent, and a carbon number 7 which may have a substituent To 17 aralkyl group and any of the group consisting of 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 from the group consisting of —SO ₂ —, —CO— and the following general formulas (3) to (6).

In formula (3), R ₁₄ and R ₁₅ each independently represent hydrogen, halogen, or a carbon atom which may have a substituent, preferably 1 to 8 carbon atoms, and more preferably 1 to 3 carbon atoms. Alkyl group, optionally substituted C1-5, preferably C1-3 alkoxy group, optionally substituted C6-12, preferably C6-8 An aryl group, an optionally substituted C7-C17, preferably C7-C12 aralkyl group, or an optionally substituted C2-C15, preferably C2 Represents the alkenyl group of ~5. Here, the substituents are each independently halogen, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms. c represents an integer of 1 to 20, preferably 1 to 12, and more preferably 1.

In the general formula (4), R ₁₆ and R ₁₇ each independently have hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms, preferably an alkyl group having 1 to 9 carbon atoms, and a substituent. Optionally has an alkoxy group having 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms, an aryl group having 6 to 12 carbon atoms, which may have a substituent, preferably an aryl group having 6 to 8 carbon atoms, a substituent Optionally represents an aralkyl group having 7 to 17 carbon atoms, preferably 7 to 12 carbon atoms, or an optionally substituted alkenyl group having 2 to 15 carbon atoms, preferably 2 to 5 carbon atoms. Here, the substituents are each independently halogen, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms. 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 formula (5), R _{18 to} R ₂₁ each independently have hydrogen, halogen, an optionally substituted alkyl group having 1 to 20 carbon atoms, preferably an alkyl group having 1 to 9 carbon atoms, and a substituent. Optionally has an alkoxy group having 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms, an aryl group having 6 to 12 carbon atoms, which may have a substituent, preferably an aryl group having 6 to 8 carbon atoms, a substituent Optionally represents an aralkyl group having 7 to 17 carbon atoms, preferably 7 to 12 carbon atoms, or an optionally substituted alkenyl group having 2 to 15 carbon atoms, preferably 2 to 5 carbon atoms. Here, the substituents are each independently halogen, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms. R ₁₈ and R ₁₉ and R ₂₀ and R ₂₁ may be bonded to each other to form a carbocycle or a heterocycle 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 3 of R _{22 to} R ₃₁ has 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)propane, 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-methyl) Phenyl)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) sulfide, 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-hydroxyphenyl)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. Can be mentioned. 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 is Further, 2,2-bis(4-hydroxyphenyl)propane (BPA) is particularly preferable from the viewpoint of easy availability even though it contains a small amount of impurities.
These dihydroxy compounds may be used alone or in combination of two or more.

Further, the polycarbonate resin contained in the injection-molded article for a light guide plate of the present invention may have a branched structure, if necessary. 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-chloroisatin bisphenol, 5,7-dichloro Luisatin bisphenol, polybrominated compounds represented by 5-bromoisatin bisphenol, etc. may be used by substituting as part of the above-mentioned dihydroxy compound, and the amount used is 0.01 to 10 mol% of all dihydroxy compounds, Preferably, 0.1 to 3 mol% can be replaced.

<Carbonate forming compound>
Examples of the carbonic acid ester forming compound used in the polycarbonate resin contained in the injection molded body for a light guide plate of the present invention include phosgene, triphosgene, carbonic acid diester, and carbonyl compound. Among the carbonic acid ester-forming compounds, phosgene is particularly preferable from the viewpoint of quality such as hue and stability of the obtained resin and further 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, di-tert-butyl carbonate, diphenyl carbonate, di-p-tolyl carbonate, phenyl-p-tolyl carbonate, and di-p-chlorophenyl carbonate. Examples include diaryl carbonate compounds. 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 obtained resin, and further from the viewpoint of cost. Are preferred, and diphenyl carbonate is particularly preferred. These carbonic acid diester compounds may be used alone or in admixture of two or more.

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

In the 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 alkyl group having 1 to 20 carbon atoms which may have a substituent, or an aryl group having 6 to 12 carbon atoms which may have a substituent. .. R _{2 to} R ₅ are preferably hydrogen, halogen, an alkyl group having 1 to 9 carbon atoms which may have a substituent, or an aryl group having 6 to 8 carbon atoms which may have a substituent. is there. Here, the substituents are each independently halogen, an alkyl group having 1 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms.

In the 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 body for a light guide plate of the present invention tends to be relatively high, and the thermal stability tends to be improved. , R ₁ having more than 5 carbon atoms tends to improve fluidity and impact resistance.

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

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

Depending on the production conditions of the polycarbonate resin contained in the light guide plate injection-molded article of the present invention, a terminal group that remains as a phenolic OH group that does not react with the terminal stopper may be formed. From the viewpoint of hydrolysis resistance, the less the phenolic OH group is, the more preferable. Specifically, it is preferable that 80 mol% or more of all terminals are sealed with the 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 preferable that the structure is sealed.

The end terminator 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 properties required for the material, and used in combination with a structure other than the structure represented by the general formula (1a). That is acceptable.
Examples of the terminal terminator which may be used in combination are 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 methyl ester, ethyl ester, propyl ester, butyl ester, amyl ester of parahydroxybenzoic acid. , Alkyl esters of parahydroxybenzoic acid such as hexyl ester and heptyl ester. It is also possible to use two or more types of the above-mentioned terminal terminators in combination. The terminal stopper which may be particularly used in combination is pt-butylphenol from the viewpoint of purity and cost.
When another end-capping agent is used, it is preferably 20 mol% or less, more preferably 10 mol% or less of the total end-capping agent.

<Amount of end stopper (monohydric phenol) used>
The molecular weight of the polycarbonate resin contained in the injection-molded article for a light guide plate of the present invention is controlled by the amount of the terminal 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 mathematical formula (I).

Based on this formula, the amounts of the end-capping agent (monohydric phenol) and dihydroxy compound used are determined. The preferred range of the amount of dihydroxy compound (mol):the amount of end-capping agent (mol) used is 50:1. To 4:1, more preferably 40:1 to 6:1, and particularly preferably 20:1 to 6:1.

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

[Other resins that can be mixed]
The resin for injection molding of the light guide plate of the present invention may contain other resins, if necessary. Examples of such other resins include polycarbonate resins other than the polycarbonate resin used in the present invention, polyethylene terephthalate resin (PET resin), polytrimethylene terephthalate (PTT resin), polybutylene terephthalate resin (PBT resin), and the like. Plastic polyester resin; polystyrene resin (PS resin), high impact polystyrene resin (HIPS), acrylonitrile-styrene copolymer (AS resin), styrene-based resin such as methyl methacrylate-styrene copolymer (MS resin); methyl methacrylate- Core/shell type elastomer such as acrylic rubber-styrene copolymer (MAS), elastomer such as polyester elastomer; polyolefin resin such as cyclic cycloolefin resin (COP resin) and cyclic cycloolefin (COP) copolymer resin; 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 preferable mixed resins include PS resin, AS resin, and PMMA resin.
In the injection-molded article for a light guide plate of the present invention, the component ratio of the other resin is preferably 10% by mass or less and more preferably 1% by mass or less of the total resin components. By setting the component ratio of the other resin to 10% by mass or less, various physical properties can be maintained.

[Additive]
Various additives may be added to the injection molded body for a light guide plate of the present invention within a range not 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.
Further, an antistatic agent, an optical brightening agent, an antifogging agent, a fluidity improving agent, a plasticizer, a dispersant, an antibacterial agent, etc. 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, phosphorous oxo acids such as phosphoric acid, phosphonic acid, phosphorous acid, phosphinic acid, and polyphosphoric acid; acidic sodium pyrophosphate salts such as sodium acidic pyrophosphate, potassium acidic pyrophosphate, and acidic calcium pyrophosphate; potassium phosphate , Phosphates of Group 1 or Group 10 metals such as sodium phosphate, cesium phosphate and zinc phosphate; organic phosphate compounds, organic phosphite compounds, organic phosphonite compounds and the like. Alternatively, at least one ester in the molecule is esterified with phenol and/or phenol having at least one alkyl group having 1 to 25 carbon atoms (a), phosphorous acid (b) and tetrakis. At least one selected from the group of (2,4-di-tert-butylphenyl)-4,4′-biphenylene-di-phosphonite (c) can be mentioned. Specific examples of the phosphite compound (a) include trioctyl phosphite, trioctadecyl phosphite, tridecyl phosphite, trilauryl phosphite, tristearyl phosphite, triphenyl phosphite, tris(monononylphenyl)phosphite. Fight, tris(monononyl/dinonyl phenyl)phosphite, trisnonylphenyl phosphite, tris(octylphenyl)phosphite, tris(2,4-di-tert-butylphenyl)phosphite, trinonylphosphite, didecyl Monophenyl phosphite, dioctyl monophenyl phosphite, diisopropyl monophenyl phosphite, monobutyl diphenyl phosphite, monodecyl diphenyl phosphite, bis(2,4-di-tert-butylphenyl) pentaerythritol phosphite, bis(2 ,6-Di-tert-butyl-4-methylphenyl)pentaerythritol phosphite, monooctyl diphenyl phosphite, distearyl pentaerythritol diphosphite, tricyclohexyl phosphite, diphenyl pentaerythritol diphosphite, bis(2,6 -Di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, 2,2-methylenebis(4,6-di-tert-butylphenyl)octylphosphite, bis(nonylphenyl)pentaerythritol diphosphite, Examples thereof include bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite and bis(2,6-di-tert-butyl-4-ethylphenyl)pentaerythritol diphosphite. 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" manufactured by ADEKA (trade name, the same applies hereinafter), and "JP-351" manufactured by Johoku Chemical Industry Co., Ltd. , "JP-360", "JP-3CP", BASF's "Irgafos 168", and the like.

Examples of the phosphoric acid stabilizer 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 be contained and 2 or more types may be contained in the phosphorus stabilizer in arbitrary combinations and ratios.

When added, the heat stabilizer is added in an amount of, for example, 0.001 part by mass or more, preferably 0.01 part by mass or more, and more preferably 0.03 part by mass or more, relative to 100 parts by mass of the polycarbonate resin. Further, it is 1 part by mass or less, preferably 0.7 part by mass or less, and more preferably 0.5 part by mass or less. If the amount of the heat stabilizer is too small, the heat stabilizing effect may be insufficient, and if the amount of the heat stabilizer is too large, the effect may reach the ceiling and may be uneconomical.

Examples of antioxidants include phenolic antioxidants, hindered phenolic antioxidants, bisphenolic antioxidants, and polyphenolic antioxidants. 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, pentaerythritoltetrakis[ 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]phosphonate, 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-bis(octylthio)-1,3,5-triazin-2-ylamino)phenol, etc. Specific examples of the phenolic antioxidant include “IRGANOX 1010” (manufactured by BASF) ( (Registered trademark, same below) , "Irganox 1076", "ADEKA STAB AO-50" and "ADEKA STAB AO-60" manufactured by ADEKA. In addition, 1 type may be contained and 2 or more types may be contained in the phenolic stabilizer in arbitrary combinations and ratios.

When compounded, 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. It is 0.5 parts by mass or less. If the addition ratio of the antioxidant is too small, the effect as the antioxidant may be insufficient, and if the addition ratio of the antioxidant is too large, the effect may reach the ceiling and may not be economical. is there.

Examples of flame retardants include metal salts of organic sulfonic acids. Examples of the organic sulfonic acid metal salt include an aliphatic sulfonic acid metal salt and an aromatic sulfonic acid metal salt. These may be used alone or in combination of two or more. Moreover, as the metal salt, an alkali metal salt and an alkaline earth metal salt are preferable. Examples of alkali metals 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, and more preferably sodium and potassium. By using 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.
Further, examples of the fluoroalkane-sulfonic acid metal salt include an alkali metal salt and an alkaline earth metal salt, of which the alkali metal salt is preferable. The carbon number of the fluoroalkanesulfonic acid metal salt is preferably 1 to 8, more preferably 2 to 4. With such a range, the effect of maintaining high transparency can be obtained. Specific examples of preferable 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 an alkali metal salt and an alkaline earth metal salt, and an alkali metal salt is preferable. Specific examples of the alkali metal sulfone sulfonic acid include 3,4-dichlorobenzenesulfonic acid sodium salt, 2,4,5-trichlorobenzenesulfonic acid sodium salt, benzenesulfonic acid sodium salt, and diphenylsulfone-3-sulfone. Acid sodium salt, diphenylsulfone-3-sulfonic acid potassium salt, 4,4'-dibromodiphenyl-sulfone-3-sulfonic acid sodium salt, 4,4'-dibromophenyl-sulfone-3-sulfonic acid potassium salt 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 Examples thereof include potassium salt and potassium p-styrene sulfonate.

The organic sulfonic acid metal salt that can be used for the injection-molded article for a light guide plate according to the present invention is, particularly from the viewpoint of improving the transparency of the molded article, a potassium salt of diphenylsulfone-3-sulfonic acid and p-toluenesulfonic acid. A potassium salt, a p-styrenesulfonic acid potassium salt, and a dodecylbenzenesulfonic acid potassium salt are preferable, and a diphenylsulfone-3-sulfonic acid potassium salt 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, and more preferably Is 0.03 parts by mass to 0.09 parts by mass. Further, in the present invention, a flame retardant other than the organic sulfonic acid metal salt may be blended.

For example, a silicone compound can be added as a flame retardant aid. The silicone compound preferably has a phenyl group in the molecule. By having a phenyl group, the dispersibility of the silicone compound in the polycarbonate is improved, and the transparency and flame retardancy are excellent. The weight average molecular weight of the silicone compound is preferably 450 to 5,000, more preferably 750 to 4,000, further preferably 1,000 to 3,000, and particularly preferably 1,500 to 2,500. When the mass average molecular weight is 450 or more, the production is facilitated, the industrial production is easily adapted, and the heat resistance of the silicone compound is less likely to decrease. On the other hand, when the weight average molecular weight of the silicone compound is 5,000 or less, the dispersibility in the polycarbonate resin is less likely to decrease, and as a result, the flame retardancy of the molded product and the mechanical properties are more effectively reduced. Tend to be suppressed.

When compounded, 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. It is preferably 5 parts by mass or less. If the addition ratio of the flame retardant auxiliary is too low, the flame retardancy may be insufficient, and if the addition ratio of the flame retardant auxiliary is too high, appearance defects such as delamination occur and transparency decreases. , Flame retardancy may reach a peak and become economical.

As the ultraviolet absorber, in addition to inorganic ultraviolet absorbers such as cerium oxide and zinc oxide, benzotriazole compounds, benzophenone compounds, salicylate compounds, cyanoacrylate compounds, triazine compounds, oxanilide compounds, malonic acid ester compounds, hindered amine compounds, phenyl salicylate. Organic UV absorbers such as compounds can be mentioned. Of these, benzotriazole-based and benzophenone-based organic ultraviolet absorbers are preferable. Particularly, specific examples of the benzotriazole compound include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole and 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-(1,1,3,3) -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-benzotriazol-2-yl)- p-cresol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylmethyl)phenol, 2-[5-chloro(2H)-benzotriazol-2-yl ]-4-Methyl-6-(tert-butyl)phenol, 2,4-di-tert-butyl-6-(5-chlorobenzotriazol-2-yl)phenol, 2-(2H-benzotriazole-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, and the like. You may use these 2 or more types together. Among the above, 2-(2′-hydroxy-5′-tert-octylphenyl)benzotriazole, 2,2′-methylene-bis[4-(1,1,3,3-tetramethylbutyl) is preferable. )-6-(2N-benzotriazol 2-yl)phenol]. Further, specific examples of the benzophenone-based UV 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 4'-tetrahydroxy-benzophenone etc. can be mentioned. Specific examples of the phenyl salicylate-based ultraviolet absorber include phenyl salicylate and 4-tert-butyl-phenyl salicylate. Furthermore, specific examples of the triazine-based ultraviolet absorber include 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[(hexyl)oxy]-phenol and 2-[4 , 6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-(octyloxy)phenol and the like. Moreover, bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate etc. can be mentioned as a specific example of a hindered amine ultraviolet absorber.

When compounded, the addition ratio of the ultraviolet absorber is, for example, 0.01 part by mass or more, preferably 0.1 part by mass or more, and 3 parts by mass or less, preferably 1 part with respect to 100 parts by mass of the polycarbonate resin. It is below the mass part. If the addition ratio of the ultraviolet absorber is too low, the effect of improving the weather resistance may be insufficient, and if the addition ratio of the ultraviolet absorber is too high, mold devogit, etc. will occur in the molded body, and the mold will be molded. May cause pollution.

Examples of the releasing agent include carboxylic acid ester, polysiloxane compound, paraffin wax (polyolefin type) and the like. Specifically, at least one compound selected from the group of aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, aliphatic hydrocarbon compounds having a number average molecular weight of 200 to 15,000, and 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 also 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, palmitic acid, stearic acid, valeric acid, caproic acid, capric acid, lauric acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, melissic acid, tetrariacontanoic acid, montanic acid, Examples thereof include glutaric acid, adipic acid and azelaic acid. As the aliphatic carboxylic acid in the ester of aliphatic carboxylic acid and alcohol, the same ones as the above aliphatic carboxylic acid can be used. On the other hand, examples of alcohols include saturated or unsaturated monohydric or polyhydric alcohols. These alcohols may have a substituent such as a fluorine atom or an aryl group. Among these, monohydric or polyhydric 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, alicyclic compounds are also included in the aliphatic group. 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. The ester compound may contain an aliphatic carboxylic acid and/or alcohol as an impurity, or may be a mixture of a plurality of compounds. Specific examples of the ester of an aliphatic carboxylic acid and an alcohol include beeswax (mixture containing myricyl palmitate as a main component), stearyl stearate, behenyl behenate, stearyl behenate, glycerin monopalmitate, glycerin monostearate. , Glycerin distearate, glycerin 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. Further, 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 may be a mixture of constituent components and various molecular weights, as long as the main component is within the above range. Examples of polysiloxane-based silicone oils include dimethyl silicone oil, phenylmethyl silicone oil, diphenyl silicone oil, and fluorinated alkyl silicones. You may use these 2 or more types together.
When compounded, the proportion of the release agent added 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. It is preferably 1 part by mass or less. If the proportion of the release agent added is too low, the effect of the releasability at the time of molding may not be sufficient, and if the proportion of the release agent added is too high, the hydrolysis resistance of the molded product decreases and during injection molding. There is a possibility that the mold will be contaminated.

Examples of dyes and pigments as colorants 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; titanium oxide, zinc oxide, red iron oxide, chromium oxide, iron black, titanium yellow, zinc-iron. -Based brown, titanium-cobalt-based green, cobalt-green, cobalt-blue, copper-chromium-based black, copper-iron-based black and other oxide-based pigments; chrome-based pigments such as yellow lead and molybdate orange; ferrocyanes such as navy blue Examples thereof include pigments. Examples of organic pigments and organic dyes as colorants include phthalocyanine dyes and pigments such as copper phthalocyanine blue and copper phthalocyanine green; azo dyes and pigments such as nickel azo yellow; thioindigo, perinone, perylene, and quinacridone. , Condensed dyes such as dioxazine, isoindolinone and quinophthalone; quinoline, anthraquinone, heterocyclic and methyl dyes and pigments. Among these, titanium oxide, carbon black, cyanine-based, quinoline-based, anthraquinone-based, phthalocyanine-based dyes and pigments are preferable from the viewpoint of thermal stability. The dyes and pigments may be contained in one kind or may be contained in two or more kinds in any combination and in any ratio. In addition, the dyes and pigments may be used as a masterbatch with a polystyrene resin, a polycarbonate resin, an acrylic resin for the purpose of improving the handling property during extrusion and improving the dispersibility in the resin composition. Good.
When compounded, the addition ratio of the colorant is, for example, 5 parts by mass or less, preferably 3 parts by mass or less, and more preferably 2 parts by mass or less with respect to 100 parts by mass of the polycarbonate resin. If the proportion of the colorant added is too large, the impact resistance of the molded product may be insufficient.

[Method for producing 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 syntheses including an interfacial polymerization method, a pyridine method, a transesterification method, and a ring-opening polymerization method of a cyclic carbonate compound. A method can be mentioned. Specifically, a dihydroxy compound and a carbonic acid ester forming compound are reacted to obtain a polymer of a linear thermoplastic polycarbonate. When the polyhydroxy compound or the polyfunctional compound is used in combination, a branched thermoplastic polycarbonate copolymer is obtained.

In the reaction by the interfacial polymerization method, the pH is usually kept at 10 or more in the presence of an organic solvent inert to the reaction and an aqueous alkaline solution, and the aromatic dihydroxy compound and the terminal stopper, and if necessary, the aromatic dihydroxy compound are used. It is possible to obtain a polycarbonate resin by using an antioxidant to prevent the oxidation of phosgene, adding a polymerization catalyst such as a tertiary amine or a quaternary ammonium salt after the reaction with phosgene, and performing interfacial polymerization. .. The addition of the terminal 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, examples of the organic solvent inert to the reaction include chlorinated hydrocarbons such as dichloromethane, 1,2-dichloroethane, chloroform, monochlorobenzene, and dichlorobenzene, aromatic hydrocarbons such as benzene, toluene, and xylene. Can be mentioned. As the terminal terminator, in addition to the above-mentioned compounds, a compound having a monovalent phenolic hydroxyl group can be used in combination as long as the effect of the present invention is 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.

Flakes of the 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 removing the solvent by evaporation. Yes, or it can be obtained by adding a dichloromethane solution containing a polycarbonate resin obtained by the interfacial polymerization method to methanol, filtering the precipitated polymer and drying it, or obtaining it by the interfacial polymerization method. The obtained dichloromethane solution containing a polycarbonate resin can be obtained by stirring and pulverizing while maintaining the temperature at 40° C. with stirring 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 the amount of terminal hydroxyl groups 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 pressure reduction during the reaction. The amount of the terminal hydroxyl group has a large influence on the thermal stability, hydrolysis stability, color tone, etc. of the polycarbonate resin, and in order to have practical physical properties, it is preferably 1,000 ppm or less, more preferably 700 ppm. It is as follows. It is general to use the carbonic acid diester in an equimolar amount or more with respect to 1 mol of the dihydroxy compound, and it is preferably used in an amount of 1.01 to 1.30 mol.

When synthesizing a polycarbonate resin by a 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 mainly used, and a basic boron compound, a basic phosphorus compound, a basic ammonium compound, or an amine-based compound is auxiliary. It is also possible to use basic compounds such as compounds in combination. In the transesterification reaction using such a raw material, a mixture of a dihydric phenol, a monohydric phenol (end terminating agent) and a carbonic acid diester is supplied to a reactor while being melted, and the reaction is performed at a temperature of 100 to 320°C. The final method is to carry out the melt polycondensation reaction under reduced pressure of 2.7×10 ² Pa ( ² mmHg) or less while removing by-products such as aromatic hydroxy compounds. 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, as the catalyst deactivator in the polycarbonate resin, a compound that neutralizes the catalyst, such as a sulfur-containing acidic compound, or a derivative formed therefrom, and the amount of the catalyst It is added in the range of 0.5 to 10 equivalents, preferably 1 to 5 equivalents, relative to the alkali metal, and is usually added in the range of 1 to 100 ppm, preferably 1 to 20 ppm, relative to the polycarbonate resin.

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

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

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

The viscosity average molecular weight (Mv) of the polycarbonate resin contained in the injection molded body for a 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, and when it is 18,000 or less, the melt viscosity is low and the fluidity is improved, making it easy to form thin and large molded products. become.

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

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

The Q value of the polycarbonate resin contained in the injection-molded body for a light guide plate of the present invention measured under the above measurement conditions is preferably 10×10 ⁻² cc/sec or more at the measurement temperature of 240° C., more preferably 13×. 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. With such a range, it is possible to mold a thin and large molded body. 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 flowability becomes low, so that it is necessary to mold the light guide plate at a higher temperature than usual, resulting in increased energy consumption and resin Tend to decompose. The Q value is preferably 100×10 ^-2 cc/sec or less, 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 defective molding such as sprue breakage and generation of voids can be more effectively prevented.

<Measurement conditions of glass transition temperature>
Measuring equipment: Differential scanning calorimeter (DSC)
Heating rate: 10° C./min Gas flow environment: Nitrogen 20 ml/min Sample pretreatment: 300° C. For the heating and melting test, 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. With such a range, a product having excellent heat resistance can be obtained. When the glass transition temperature is 90° C. or higher, it is possible to more effectively prevent the polycarbonate resin powder from aggregating in the granulating 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 product 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 Seisaku-sho, Ltd. can be used.

The Izod impact strength of the molded product 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 the content in such a range, it is possible to more effectively prevent cracking and crack generation of the molded body during molding and after molding.

[Use]
INDUSTRIAL APPLICABILITY The injection molded body for a light guide plate of the present invention is superior in impact resistance to a conventional molded body and can be easily increased in size. Therefore, the field of liquid crystal backlight units, various display devices, and illumination devices Can be suitably used as a light guide plate of. Examples of such devices include mobile phones, mobile notebooks, netbooks, slate PCs, tablet PCs, smartphones, mobile terminals such as tablet terminals, cameras, watches, notebook computers, various displays, and lighting devices. .. According to one aspect of the present invention, there is provided a light guide plate containing the molded article of the present invention as a member.

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

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples unless the gist thereof 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.

<Conditions for measuring viscosity average molecular weight (Mv)>
Measuring instrument: Ubbelohde capillary viscometer Solvent: Dichloromethane resin solution concentration: 0.5 g/deciliter Measuring temperature: 25°C
The intrinsic viscosity [η] deciliter/gram was measured with the Huggins constant of 0.45 under the above conditions, and calculated by the following mathematical formula (II).

<Moldability evaluation>
Using an injection molding machine ("HSP100A" manufactured by Sodick Co., Ltd.), a 3.5-inch, 0.4-mm-thick light guide plate-shaped test piece was molded at a resin temperature of 340°C and a mold temperature of 80°C. The molded product was evaluated by the deformation of the product and the occurrence of cracks.

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

<Measurement conditions of glass transition temperature>
Measuring equipment: 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: Shimadzu Corporation differential scanning calorimeter (DSC) DSC-50

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

[Production of terminal stopper]
<Production Example 1>
Based on the description on pages 143 to 150 of the Organic Chemistry Handbook (3rd edition: Organic Synthetic Chemistry Association, edited by Technido), 4-hydroxybenzoic acid manufactured by Tokyo Kasei Kogyo Co., Ltd. and Tokyo Kasei Kogyo Co., Ltd. Esterification by dehydration reaction was performed using 1-butanol to obtain butyl parahydroxybenzoate (end stopper 1).

<Production Example 2>
Parahydroxybenzoic acid 2-ethylhexyl ester (end terminator 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 (end terminator 3) was obtained in the same manner as in Production Example 1 except that 1-butanol was changed to 1-hexadecanol manufactured by Tokyo Kasei Kogyo Co., Ltd.

<Production Example 4>
Para-hydroxybenzoic acid docosyl ester (end terminator 4) was obtained in the same manner as in Production Example 1 except that 1-butanol was changed to 1-docosanol manufactured by Tokyo Kasei Kogyo Co., Ltd.

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

[Manufacture of Injection Molded Body 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 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 while stirring.

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

The polymerization liquid 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 liquid became neutral. Polycarbonate resin powder was obtained by distilling off the organic solvent from this purified polycarbonate resin solution.

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

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

The obtained pellets were dried at 100° C. for 5 to 7 hours with a hot air circulation dryer, and then with an injection molding machine (“C-Mobile” manufactured by Shinko Cellbic Co., Ltd.) at a resin temperature of 300° C. and a mold temperature of 80° C. A test piece for Izod impact test was molded, and a notched Izod impact test was carried out in accordance with ASTM D256.

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

Further, using the dried pellets obtained, an injection molding machine (“HSP100A” manufactured by Sodick Co., Ltd.) was used to prepare a light guide plate type test piece having a resin temperature of 340° C. and a mold temperature of 80° C. of 3.5 inches and a thickness of 0.4 mm. Molded. At that time, the moldability was confirmed regarding insufficient filling and occurrence of deformation and cracks in the molded body. The case where a good molded product was obtained without any problem in moldability was rated as "○", and the case where a problem occurred and the product was defective was rated as "x".

The moldability was good.

<Example 2>
Polycarbonate resin pellets and molded bodies 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 viscosity average molecular weight of the obtained polycarbonate resin is 16,500, the glass transition point (Tg) is 120° C., the Q value is 15×10 ⁻² cc/sec, the Izod impact strength is 190 J/m, and the moldability is good. Met.

<Example 3>
Polycarbonate resin pellets and molded bodies were obtained in the same manner as in Example 1 except that the amount of the terminal terminator 2 was changed to 818 g (3.27 mol).

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

<Example 4>
Polycarbonate resin pellets and molded bodies 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 viscosity average molecular weight of the obtained polycarbonate resin is 13,000, the glass transition point (Tg) is 99° C., the Q value is 70×10 ⁻² cc/sec, the Izod impact strength is 50 J/m, and the moldability is good. Met.

<Example 5>
Polycarbonate resin pellets and molded articles 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 viscosity average molecular weight of the obtained polycarbonate resin is 18,000, the glass transition point (Tg) is 115° C., the Q value is 20×10 ⁻² cc/sec, the Izod impact strength is 350 J/m, and the moldability is good. Met.

<Example 6>
Polycarbonate resin pellets and molded articles 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 viscosity average molecular weight of the obtained polycarbonate resin is 15,000, the glass transition point (Tg) is 104° C., the Q value is 35×10 ⁻² cc/sec, the Izod impact strength is 180 J/m, and the moldability is good. Met.

<Example 7>
Polycarbonate resin pellets and molded articles 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 viscosity average molecular weight of the obtained polycarbonate resin is 13,000, the glass transition point (Tg) is 95° C., the Q value is 57×10 ⁻² cc/sec, the Izod impact strength is 50 J/m, and the moldability is good. Met.

<Example 8>
Polycarbonate resin pellets and molded bodies 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 obtained 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 good moldability. Met.

<Example 9>
Polycarbonate resin pellets and molded bodies 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 viscosity average molecular weight of the obtained polycarbonate resin is 16,000, the glass transition point (Tg) is 101° C., the Q value is 35×10 ⁻² cc/sec, the Izod impact strength is 190 J/m, and the moldability is good. Met.

<Example 10>
Polycarbonate resin pellets and molded articles 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 viscosity average molecular weight of the obtained polycarbonate resin is 13,000, the glass transition point (Tg) is 90° C., the Q value is 70×10 ⁻² cc/sec, the Izod impact strength is 50 J/m, and the moldability is good. Met.

<Comparative Example 1>
Polycarbonate resin pellets and molded bodies 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 viscosity average molecular weight of the obtained polycarbonate resin was 15,000, the glass transition point (Tg) was 128° C., the Q value was 9×10 ⁻² cc/sec, the Izod impact strength was 230 J/m, and the moldability was poor. Met.

<Comparative example 2>
Polycarbonate resin pellets and molded bodies 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 viscosity average molecular weight of the obtained polycarbonate resin was 24,000, the glass transition point (Tg) was 138° C., the Q value was 1×10 ⁻² cc/sec, the Izod impact strength was 700 J/m, and the moldability was poor. Met.

<Comparative example 3>
Polycarbonate resin pellets and molded bodies were obtained in the same manner as in Example 1 except that the amount of the terminal terminator 2 was changed to 1171 g (4.69 mol).

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

<Comparative example 4>
Polycarbonate resin pellets and molded bodies 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 viscosity average molecular weight of the obtained polycarbonate resin is 20,000, the glass transition point (Tg) is 119° C., the Q value is 9×10 ⁻² cc/sec, the Izod impact strength is 530 J/m, and the moldability is poor. Met.

<Comparative Example 5>
Polycarbonate resin pellets and molded articles 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 viscosity average molecular weight of the obtained polycarbonate resin is 10,000, the glass transition point (Tg) is 71° C., the Q value is 93×10 ⁻² cc/sec, the Izod impact strength is 10 J/m, and the moldability is poor. Met.

<Comparative example 6>
Polycarbonate resin pellets and molded articles were obtained in the same manner as in Example 1 except that 628 g (2.51 mol) of the terminator 2 was changed to 1267 g (2.84 mol) of the terminator 4.

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

<Comparative Example 7>
Polycarbonate resin pellets and molded bodies 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 viscosity average molecular weight of the obtained polycarbonate resin is 10,000, the glass transition point (Tg) is 80° C., the Q value is 90×10 ⁻² cc/sec, the Izod impact strength is 10 J/m, and the moldability is poor. Met.

<Comparative Example 8>
Polycarbonate resin pellets and molded bodies 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 viscosity average molecular weight of the obtained polycarbonate resin was 16,000, the glass transition point (Tg) was 85° C., the Q value was 36×10 ⁻² cc/sec, the Izod impact strength was 180 J/m, and the moldability was poor. Met.

By including the polycarbonate resin having excellent fluidity and impact strength as described above, it was possible to provide an injection molded article for a light guide plate having good impact resistance.

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

The present invention also includes the following aspects.
<1> An injection-molded article for a light guide plate, which contains a polycarbonate resin obtained by reacting a monohydric phenol represented by the following general formula (1a) as an end stopper.

(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 each independently have hydrogen, halogen or a substituent. It represents any one of the group consisting of an 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 product 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 alkoxyl group having 1 to 5 carbon atoms which may have a substituent, or an alkyl group having 1 to 20 carbon atoms which may have a substituent. Group, an alkoxy group having 1 to 5 carbon atoms which may have a substituent, an aryl group having 6 to 12 carbon atoms which may have a substituent, and an aryl group having 7 to 17 carbon atoms which may have a substituent Represents any 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 -, -CO- and any of the structures consisting of the following general formulas (3) to (6).)
(In the formula, R ₁₄ and R ₁₅ are each independently hydrogen, halogen, an alkyl group having 1 to 20 carbon atoms which may have a substituent, an alkoxy group having 1 to 5 carbon atoms which may have a substituent. 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 aryl group having 7 to 17 carbon atoms which may have a substituent. Represents any one of the group consisting of aralkyl groups, and c represents an integer of 1 to 20)
(In the formula, R ₁₆ and R ₁₇ are each independently hydrogen, halogen, an alkyl group having 1 to 20 carbon atoms which may have a substituent, an alkoxy group having 1 to 5 carbon atoms which may have a substituent. 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. R ₁₆ and R ₁₇ may be bonded to each other to form a carbocycle or heterocycle having 1 to 20 carbon atoms.
(In the formula, R _{18 to} R ₂₁ are each independently hydrogen, halogen, an alkyl group having 1 to 20 carbon atoms which may have a substituent, an alkoxy group having 1 to 5 carbon atoms which may have a substituent. 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. represents either of the group consisting of _{radicals, R 18} and _{R 19} and _{R 20} and _{R 21} are combined with each other, they may form a carbocyclic or heterocyclic ring having 1 to 20 carbon atoms.)
_(Wherein, R 22 _{to R 31} are each independently a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.
<3> The molded product according to <1> or <2>, wherein the polycarbonate resin has a viscosity average molecular weight of 13,000 to 18,000.
<4> The molded product 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 product according to <4>, wherein R ₁ in the general formula (8a) is at _{least one selected} from 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>, in which the Q value of the polycarbonate resin is 10×10 ⁻² cc/sec or more.
<8> The molded product 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 product according to any one of <1> to <8>, in which the glass transition temperature of the polycarbonate resin is 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 (8)

An injection molded body for a light guide plate, which has a terminal structure represented by the following general formula (1) and contains a polycarbonate resin having a viscosity average molecular weight of 13,000 to 18,000.

(In the formula,
R ₁ is at least one selected from the group consisting of a 2-ethylhexyl group, a 2-hexyldecyl group, a hexadecyl group and a docosyl group,
R _{2 to} R ₅ are each independently a group consisting of hydrogen, halogen, an alkyl group having 1 to 20 carbon atoms which may have a substituent and an aryl group having 6 to 12 carbon atoms which may have a substituent. Represents one of the above. ) The molded product according to claim 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 alkoxyl group having 1 to 5 carbon atoms which may have a substituent, an alkyl group having 1 to 20 carbon atoms which may have a substituent, and a substituent. 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 aralkyl group having 7 to 17 carbon atoms which may have a substituent, and a substituent. Represents any one of a group consisting of an alkenyl group having 2 to 15 carbon atoms which may have a group,
X is a single bond, -O -, - S -, - SO -, - SO 2 -, - CO- and the following general formula (3) to (6) of the group consisting of is any structure. )

(In the formula,
R ₁₄ and R ₁₅ each independently represent hydrogen, halogen, an alkyl group having 1 to 20 carbon atoms which may have a substituent, an alkoxy group having 1 to 5 carbon atoms which may have a substituent, and a substituent. It comprises 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 alkyl group having 1 to 20 carbon atoms which may have a substituent, an alkoxy group having 1 to 5 carbon atoms which may have a substituent. 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. R ₁₆ and R ₁₇ may be bonded to each other to form a carbocycle or heterocycle having 1 to 20 carbon atoms.

(In the formula, R _{18 to} R ₂₁ are each independently hydrogen, halogen, an alkyl group having 1 to 20 carbon atoms which may have a substituent, an alkoxy group having 1 to 5 carbon atoms which may have a substituent. 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. represents either of the group consisting of _{radicals, R 18} and _{R 19} and _{R 20} and _{R 21} are combined with each other, they may form a carbocyclic or heterocyclic ring having 1 to 20 carbon atoms.)

_(Wherein, R 22 _{to R 31} are each independently a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.) The molded product according to claim 1, wherein the terminal structure has a structure represented by the following general formula (8).

(In the formula, R ₁ is at least one selected from the group consisting of a 2-ethylhexyl group, a 2-hexyldecyl group, a hexadecyl group, and a docosyl group.) The molded body according to claim 2 , wherein X in the general formula (2) has the structure of the general formula (3). The molded product according to any one of claims 1 to 4, wherein the Q value of the polycarbonate resin is 10 × 10 ^-2 cc/sec or more. The molded article according to claim 1, wherein the polycarbonate resin has an Izod impact strength of 30 J/m or more. The glass transition temperature of the said polycarbonate resin is 90 degreeC or more, The molded object as described in any one of Claims 1-6. A light guide plate containing the molded product according to claim 1 as a member.