Polycarbonate resin composition and molded article thereof

Abstract

To provide a resin composition excellent in light guide performance under an LED light source and also excellent in dry heat resistance and moist heat resistance, and a molded article comprising the same.SOLUTION: A polycarbonate resin composition contains (A) a polycarbonate resin, (B) a triarylphosphine-based compound represented by the following formula [1], (C) a pentaerythritol diphosphite-based compound, and (D) an epoxy group-containing compound. The content of the component B is 0.005-0.3 pt.wt., the content of the component C is 0.001-0.08 pt.wt., and the content of the component D is 0.005-0.3 pt.wt. based on 100 pts.wt. of the component A.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a polycarbonate resin composition and a molded article thereof. More specifically, the present invention relates to a polycarbonate resin composition and a molded article thereof, which have excellent light-guiding performance under an LED light source and excellent long-term durability in high-temperature environments (dry heat resistance) and in high-temperature, high-humidity environments (humid heat resistance) by blending a triarylphosphine compound having a specific structure, a pentaerythritol diphosphite compound, and an epoxy group-containing compound in specific ranges. [Background technology]

[0002] Light sources that use LEDs as a light source have been attracting attention as the next generation of light sources due to their energy saving and long life. Since the development of blue light-emitting diodes in the 1990s, the practicality of white light illumination using LEDs has increased, and commercial products have rapidly appeared, primarily for spot lighting.

[0003] Furthermore, for surface light sources such as displays, LED light sources are increasingly being used because the light emitted by RGB three-color LEDs has the advantage of being highly color pure and able to greatly expand the color reproduction range compared to the colors (red, green, and blue) obtained by passing the white light emitted by cold cathode fluorescent lamps through a color filter.

[0004] On the other hand, because LEDs are point light sources, when trying to illuminate a wide area, it is necessary to install many LEDs on the back of the light source (backlight method), and each one appears as a point light source, which means that there is a drawback in that it is prone to unevenness.Recently, in order to eliminate this unevenness and aim for cost reduction, further power saving, and even thinner products, there has been an increase in light sources using the so-called edge light method, in which LEDs are placed on the edge of the light source body.

[0005] In edge-light type light sources, a light guide is used to transmit light over long distances in order to achieve uniform surface luminance. However, the problem with edge-light type light sources is that the light becomes darker as it gets farther away from the light source.

[0006] In recent years, the adoption of daytime running lamps in automobile headlights and other areas has been promoted to improve daytime visibility and prevent accidents, and their installation has become mandatory in Europe. Current daytime running lamps mainly use LED light sources that enter and guide light from the edge of a molded body with a long optical path, but the light becomes dimmer as it moves away from the light source. Furthermore, daytime running lamps are installed close to the edge of the molded body, and high-output LED light sources are used, which causes discoloration due to exposure to high temperatures at the edge of the molded body near the light source, and further heating of the discolored area causes scorching and a decrease in light-guiding performance.

[0007] Resin materials for these molded articles that require light-guiding properties must be transparent, meaning they minimize the attenuation of light from the light source. Among transparent resins, polymethyl methacrylate (PMMA) has been the most suitable material to date. However, PMMA's impact resistance and heat resistance are not necessarily sufficient, limiting its use in the aforementioned applications. Therefore, attention has been focused on technologies to improve the light-guiding properties and long-term durability in high-temperature environments (hereinafter referred to as "dry heat resistance") of polycarbonate resin, which has superior heat and impact resistance to PMMA. Furthermore, as mentioned above, the use of light-guiding polycarbonate molded parts for automotive exteriors, such as daytime running lamps, has been increasing in recent years, and improvements in long-term durability in high-temperature, high-humidity environments (hereinafter referred to as "humid heat resistance") are also desired.

[0008] As an example of improving the light-guiding properties, dry heat resistance, and moist heat resistance of polycarbonate, Patent Document 1 reports an aromatic polycarbonate resin composition for light guide plates, which is made by blending a specific phosphorus-based stabilizer and a mold release agent with a polycarbonate resin having a viscosity average molecular weight of 13,000 to 15,000. However, in addition to problems with strength, there are also problems with the phosphorus-based stabilizer reducing moist heat resistance, limiting its applications.

[0009] Patent Documents 2 and 3 report aromatic polycarbonate resin compositions for light guide plates containing a small amount of a specific siloxane compound. However, silicone-based compounds may generate low-molecular-weight silicone gas under high-temperature conditions.

[0010] Patent Document 4 reports a light guide plate in which a light scattering layer is provided on the front or back surface of a plate-shaped molded product formed from a resin composition consisting of polycarbonate and acrylic resin.

[0011] Patent Document 5 reports an aromatic polycarbonate resin composition comprising an aromatic polycarbonate resin and another thermoplastic resin having a refractive index difference of 0.001 or more with that of the aromatic polycarbonate resin. However, because an acrylic resin, which is inherently incompatible with polycarbonate resin, is added, the amount added is limited, and the composition may not fully exhibit light-guiding properties.

[0012] Patent Document 6 reports a polycarbonate resin composition that does not lose its optical properties due to deterioration during molding even when molded over a wide temperature range by blending specific amounts of a specific phosphorus-based compound and a polycaprolactone polyol, which have excellent heat resistance and hydrolysis resistance, with an aromatic polycarbonate resin. Patent Document 7 also reports a polycarbonate resin composition that has excellent light conductivity, little yellowing during molding, little deterioration in humid and hot environments, and excellent fluidity by blending specific polyether-based polymers or polyoxyalkylene bisphenol A ethers with specific phosphorus-based compounds in specific ratios. However, many polycaprolactones, polyether-based polymers, polyoxyalkylene bisphenol A ethers, etc. are liquid at room temperature and have low melting points. Furthermore, blending large amounts to achieve the desired effect raises concerns about a decrease in the glass transition temperature and deflection temperature under load of the polycarbonate resin, as well as a decrease in mechanical properties such as impact strength.

[0013] Patent Document 8 reports a polycarbonate resin composition that can produce molded articles that have a good initial color tone after low-temperature molding at 280°C or less and that are also excellent in long-term moist heat resistance and long-term heat resistance by blending specific amounts of an alicyclic epoxy compound, a specific antioxidant, and a specific phosphorus compound into an aromatic polycarbonate resin. However, the aryl phosphine blended does not have a specific structure, and the light-guiding properties and dry heat resistance are insufficient. [Prior art documents] [Patent documents]

[0014] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-204737 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-250557 [Patent Document 3] Japanese Patent Application Laid-Open No. 2015-157901 [Patent Document 4] Japanese Patent Application Publication No. 10-73725 [Patent Document 5] Japanese Patent Application Laid-Open No. 2002-60609 [Patent Document 6] Patent No. 6702615 [Patent Document 7] Japanese Patent Application Laid-Open No. 2023-149670 [Patent Document 8] Patent No. 7208890 Summary of the Invention [Problem to be solved by the invention]

[0015] An object of the present invention is to provide a resin composition that has excellent light-guiding performance under an LED light source and also has excellent dry heat resistance and moist heat resistance, and a molded article made from the same. [Means for solving the problem]

[0016] As a result of extensive research, the present inventors have found that the above-mentioned problems can be solved by blending a triarylphosphine compound having a specific structure, a pentaerythritol diphosphite compound, and an epoxy group-containing compound in specific ranges with a polycarbonate resin, and have thereby completed the present invention. That is, according to the present invention, the following configurations (1) to (16) are provided.

[0017] (1) A polycarbonate resin composition comprising (A) a polycarbonate resin (component A), (B) a triarylphosphine compound represented by the following formula [1] (component B), (C) a pentaerythritol diphosphite compound (component C), and (D) an epoxy group-containing compound (component D), wherein the content of component B is 0.005 to 0.3 parts by weight, the content of component C is 0.001 to 0.08 parts by weight, and the content of component D is 0.005 to 0.3 parts by weight, relative to 100 parts by weight of component A.

[0018] [ka] [In the formula, R 2-1 , R 2-2 , R 2-3 , R 6-1 , R 6-2 , R 6-3 , R 0-1 , R 0-2 , R 0-3 are hydrogen atoms, hydrocarbon groups, alkoxy groups or halogens, and may be the same or different. 2-1 , R 2-2 , R 2-3 , R 6-1 , R 6-2 , R 6-3 At least one of p, q, and r is a hydrocarbon group, an alkoxy group, or a halogen atom. p, q, and r are each an integer of 0 to 3.]

[0019] (2) The polycarbonate resin composition according to the above item (1), wherein the hydrocarbon group in formula (1) is an alkyl group, an aralkyl group, an alkenyl group, or an aryl group. (3) In formula [1], R 2-1, R 2-2 , R 2-3 , R 6-1 , R 6-2 , R 6-3 The polycarbonate resin composition according to the above item (1) or (2), wherein at least one of the groups is an alkyl group or an alkoxy group. (4) In formula [1], R 2-1 , R 2-2 , R 2-3 , R 6-1 , R 6-2 , R 6-3 The polycarbonate resin composition according to any one of the above items (1) to (3), wherein at least one of the groups is an alkyl group having 1 to 4 carbon atoms. (5) The polycarbonate resin composition according to any one of the above items (1) to (4), wherein component B is at least one member selected from the group consisting of tri(o-tolyl)phosphine, tri(2,4-xylyl)phosphine, and tri(2,5-xylyl)phosphine. (6) The polycarbonate resin composition according to any one of the above items (1) to (5), wherein Component C is at least one member selected from the group consisting of bis(2,4-dicumylphenyl)pentaerythritol diphosphite and bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite. (7) The polycarbonate resin composition according to any one of the above (1) to (6), wherein the content of the component B is 0.01 to 0.1 parts by weight per 100 parts by weight of the component A. (8) The polycarbonate resin composition according to any one of the above items (1) to (7), wherein the content of the component C is 0.005 to 0.05 parts by weight per 100 parts by weight of the component A. (9) The polycarbonate resin composition according to any one of the above (1) to (8), wherein the content of the component D is 0.01 to 0.1 parts by weight per 100 parts by weight of the component A. (10) The polycarbonate resin composition according to any one of the above (1) to (9), containing 0.01 to 1 part by weight of (E) a fatty acid ester compound (component E) composed of a polyhydric alcohol and a higher fatty acid per 100 parts by weight of component A. (11) The polycarbonate resin composition according to any one of (1) to (10) above, wherein the viscosity average molecular weight of component A is in the range of 11,500 to 50,000. (12) The polycarbonate resin composition according to any one of the preceding items (1) to (11), wherein the dry heat resistance (Y2-Y1), expressed as the difference between Y1 and Y2, is 1.0 or less, when the transmission color (YI in ASTM D1925) of a 2 mm thick plate obtained by injection molding a powder or granule made from the resin composition according to any one of the preceding items (1) to (11) under conditions of a cylinder temperature of 270°C, a mold temperature of 80°C, a molding cycle time of 50 seconds, and a residence time of 100 seconds, is Y1, and the transmission color (YI in ASTM D1925) of the 2 mm thick plate after treating it in a hot air dryer environment at 130°C for 1,000 hours is Y2. (13) The polycarbonate resin composition according to any one of the preceding items (1) to (12), wherein the haze value (HAZE according to ISO 14782) of a 2 mm thick plate obtained by injection molding a powder or granule made from the resin composition according to any one of the preceding items (1) to (12) under conditions of a cylinder temperature of 270°C, a mold temperature of 80°C, a molding cycle time of 50 seconds, and a residence time of 100 seconds is H1, and the haze value (HAZE according to ISO 14782) of the 2 mm thick plate after treating it in an environment of a temperature of 120°C and 100% RH for 24 hours is H2, and the moist heat resistance (H2-H1), which is expressed as the difference between H1 and H2, is 15 or less. (14) A molded article made of the polycarbonate resin composition according to any one of the above items (1) to (13). (15) The molded product according to the preceding paragraph (14), which is a light-guiding part. (16) The molded product according to the preceding paragraph (15), which is a light guide part for a vehicle. [Effects of the Invention]

[0020] The polycarbonate resin composition and molded article of the present invention have excellent light-guiding performance under an LED light source, and when used in applications for guiding light from an LED light source, they exhibit little light attenuation and also have good dry heat resistance and moist heat resistance.

[0021] The molded product can be used in various industrial applications such as the lighting field including LED lighting, the OA equipment field, the electric and electronic equipment field, the automotive field, and the building materials field, and is extremely useful.

Brief Description of the Drawings

[0022] [Figure 1] It is a diagram showing the results of evaluating the spectral light transmittance of the molded products obtained in Example 1, Example 7, Comparative Example 2, and Comparative Examples 4 to 8.

Modes for Carrying Out the Invention

[0023] Hereinafter, the details of the present invention will be described.

[0024] <Component A: Polycarbonate Resin> The polycarbonate resin used as Component A of the present invention is usually obtained by reacting a dihydroxy compound and a carbonate precursor by an interfacial polycondensation method or a melt transesterification method. In addition, it can also be obtained by polymerizing a carbonate prepolymer by a solid-phase transesterification method or by polymerizing a cyclic carbonate compound by a ring-opening polymerization method.

[0025] The dihydroxy component used here may be any component that is usually used as the dihydroxy component of a polycarbonate resin, and may be bisphenols or aliphatic diols.

[0026] Examples of bisphenols include 4,4'-dihydroxybiphenyl, bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 2,2-bis(4-hydroxy-3,3'-biphenyl)propane, 2,2-bis(4-hydroxy- 2,2-bis(3-isopropylphenyl)propane, 2,2-bis(3-t-butyl-4-hydroxyphenyl)propane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)octane, 2,2-bis(3-bromo-4-hydroxyphenyl)propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 2,2-bis(3-cyclohexyl-4-hydroxyphenyl)propane, 1,1-bis(3-cyclohexyl-4-hydroxyphenyl)cyclohexane, bis(4-hydroxyphenyl) 1,1-bis(4-hydroxyphenyl)methane, 9,9-bis(4-hydroxyphenyl)fluorene, 9,9-bis(4-hydroxy-3-methylphenyl)fluorene, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)cyclopentane, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether, 4,4'-sulfonyldiphenol, 4,4'-dihydroxydiphenyl sulfoxide, 4,4'-dihydroxydiphenyl sulfide, 2,2'-dimethyl -4,4'-Sulfonyldiphenol, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide, 2,2'-diphenyl-4,4'-sulfonyldiphenol, 4,4'-dihydroxy-3,3'-diphenyldiphenyl sulfoxide, 4,4'-dihydroxy-3,3'-diphenyldiphenyl sulfide, 1,3-bis{2-(4-hydroxyphenyl)propyl}benzene, 1,4-bis{2-(4-hydroxyphenyl)propyl}benzene, 1,Examples include 4-bis(4-hydroxyphenyl)cyclohexane, 1,3-bis(4-hydroxyphenyl)cyclohexane, 4,8-bis(4-hydroxyphenyl)tricyclo[5.2.1.0(2,6)]decane, 4,4'-(1,3-adamantanediyl)diphenol, 1,3-bis(4-hydroxyphenyl)-5,7-dimethyladamantane, and bisphenol compounds having a siloxane structure represented by the following formula [2]:

[0027] [ka]

[0028] [In the formula, R 3 and R 4 are each independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms; R 5 , R 6 , R 7 , R 8 , R 9 and R 10 are each independently a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 12 carbon atoms, p and q are each an integer of 1 to 4, e is a natural number, f is 0 or a natural number, and e+f is a natural number less than 100. X is a divalent aliphatic group having 2 to 8 carbon atoms.

[0029] Examples of aliphatic diols include 2,2-bis-(4-hydroxycyclohexyl)-propane, 1,14-tetradecanediol, octaethylene glycol, 1,16-hexadecanediol, 4,4'-bis(2-hydroxyethoxy)biphenyl, bis{(2-hydroxyethoxy)phenyl}methane, 1,1-bis{(2-hydroxyethoxy)phenyl}ethane, 1,1-bis{(2-hydroxyethoxy)phenyl}-1-phenylethane, 2,2-bis{(2-hydroxyethoxy)phenyl}propane, 2,2-bis{(2-hydroxy 2,2-bis{4-(2-hydroxyethoxy)-3-methylphenyl}propane, 1,1-bis(2-hydroxyethoxy)phenyl}-3,3,5-trimethylcyclohexane, 2,2-bis{4-(2-hydroxyethoxy)-3,3'-biphenyl}propane, 2,2-bis{(2-hydroxyethoxy)-3-isopropylphenyl}propane, 2,2-bis{3-t-butyl-4-(2-hydroxyethoxy)phenyl}propane, 2,2-bis{(2-hydroxyethoxy)phenyl}butane, 2,2-bis{(2-hydroxyethoxy)phenyl}-4-methylpentane, 2 ,2-bis{(2-hydroxyethoxy)phenyl}octane, 1,1-bis{(2-hydroxyethoxy)phenyl}decane, 2,2-bis{3-bromo-4-(2-hydroxyethoxy)phenyl}propane, 2,2-bis{3,5-dimethyl-4-(2-hydroxyethoxy)phenyl}propane, 2,2-bis{3-cyclohexyl-4-(2-hydroxyethoxy)phenyl}propane, 1,1-bis{3-cyclohexyl-4-(2-hydroxyethoxy)phenyl}cyclohexane, bis{(2-hydroxyethoxy)phenyl}diphenyl Methane, 9,9-bis{(2-hydroxyethoxy)phenyl}fluorene, 9,9-bis{4-(2-hydroxyethoxy)-3-methylphenyl}fluorene, 1,1-bis{(2-hydroxyethoxy)phenyl}cyclohexane, 1,1-bis{(2-hydroxyethoxy)phenyl}cyclopentane, 4,4'-bis(2-hydroxyethoxy)diphenyl ether, 4,4'-bis(2-hydroxyethoxy)-3,3'-dimethyldiphenyl ether, 1,3-bis[2-{(2-hydroxyethoxy)phenyl}propyl]benzene, 1,Examples include 4-bis[2-{(2-hydroxyethoxy)phenyl}propyl]benzene, 1,4-bis{(2-hydroxyethoxy)phenyl}cyclohexane, 1,3-bis{(2-hydroxyethoxy)phenyl}cyclohexane, 4,8-bis{(2-hydroxyethoxy)phenyl}tricyclo[5.2.1.02,6]decane, 1,3-bis{(2-hydroxyethoxy)phenyl}-5,7-dimethyladamantane, 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro(5,5)undecane, 1,4:3,6-dianhydro-D-sorbitol (isosorbide), 1,4:3,6-dianhydro-D-mannitol (isomannide), and 1,4:3,6-dianhydro-L-iditol (isoidide).

[0030] Among these, aromatic bisphenols are preferred, and in particular, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 4,4'-sulfonyldiphenol, 2,2'-dimethyl-4,4'-sulfonyldiphenol, 9,9-bis(4-hydroxy-3- Preferred are bisphenol compounds represented by the formula [2], such as 1,3-bis{2-(4-hydroxyphenyl)propyl}benzene, 1,4-bis{2-(4-hydroxyphenyl)propyl}benzene, and 2,2-bis(4-hydroxyphenyl)propane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 4,4'-sulfonyldiphenol, and 9,9-bis(4-hydroxy-3-methylphenyl)fluorene. Among these, 2,2-bis(4-hydroxyphenyl)propane is the most suitable due to its excellent strength and durability. These compounds may be used alone or in combination.

[0031] The polycarbonate resin used as component A of the present invention may be a branched polycarbonate resin by using a branching agent in combination with the dihydroxy compound. Examples of trifunctional or higher polyfunctional aromatic compounds used in such branched polycarbonate resins include phloroglucin, phloroglucside, 4,6-dimethyl-2,4,6-tris(4-hydroxyphenyl)heptene-2,2,4,6-trimethyl-2,4,6-tris(4-hydroxyphenyl)heptane, 1,3,5-tris(4-hydroxyphenyl)benzene, 1,1,1-tris(4-hydroxyphenyl)ethane, 1,1,1-tris(3,5-dimethyl-4-hydroxyphenyl)ethane, 2,6-bis(2-hydroxy-5-methylbenzyl)-4-methylphenol, 4-[4-[1,1-bis(4- Examples of the 4-hydroxyphenyl ether include trisphenols such as {4-hydroxyphenyl)ethyl]benzene}-α,α-dimethylbenzylphenol, tetra(4-hydroxyphenyl)methane, bis(2,4-dihydroxyphenyl)ketone, 1,4-bis(4,4-dihydroxytriphenylmethyl)benzene, trimellitic acid, pyromellitic acid, benzophenonetetracarboxylic acid, and acid chlorides thereof. Among these, 1,1,1-tris(4-hydroxyphenyl)ethane and 1,1,1-tris(3,5-dimethyl-4-hydroxyphenyl)ethane are preferred, and 1,1,1-tris(4-hydroxyphenyl)ethane is particularly preferred.

[0032] These polycarbonate resins are produced by known reaction means for producing ordinary aromatic polycarbonate resins, for example, by reacting an aromatic dihydroxy component with a carbonate precursor such as phosgene or a carbonate diester. The basic means for this production method will be briefly explained.

[0033] Reactions using, for example, phosgene as a carbonate precursor are typically carried out in the presence of an acid binder and a solvent. Examples of acid binders include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, or amine compounds such as pyridine. Examples of solvents include halogenated hydrocarbons such as methylene chloride and chlorobenzene. To accelerate the reaction, a catalyst such as a tertiary amine or a quaternary ammonium salt can also be used. The reaction temperature is typically 0 to 40°C, and the reaction time is several minutes to 5 hours. Transesterification reactions using a carbonate diester as a carbonate precursor are carried out by stirring a predetermined ratio of aromatic dihydroxy components with the carbonate diester under heating in an inert gas atmosphere, and then distilling off the resulting alcohol or phenol. The reaction temperature varies depending on the boiling point of the resulting alcohol or phenol, but is typically in the range of 120 to 300°C. The reaction is completed by reducing the pressure from the beginning of the reaction to distill off the resulting alcohol or phenol. To accelerate the reaction, a catalyst typically used in transesterification reactions can also be used. Examples of the carbonic acid diester used in the transesterification reaction include diphenyl carbonate, dinaphthyl carbonate, bis(diphenyl) carbonate, dimethyl carbonate, diethyl carbonate, dibutyl carbonate, etc. Among these, diphenyl carbonate is particularly preferred.

[0034] In the present invention, a terminal terminator is used in the polymerization reaction. The terminal terminator is used to adjust the molecular weight, and the resulting polycarbonate resin has excellent thermal stability compared to unterminated polycarbonate resins because the terminals are blocked. Examples of such terminal terminators include monofunctional phenols represented by the following formulas [3] to [5].

[0035] [ka]

[0036] [In formula [3], A is a hydrogen atom, an alkyl group having 1 to 9 carbon atoms, an alkylphenyl group (the alkyl portion has 1 to 9 carbon atoms), a phenyl group, or a phenylalkyl group (the alkyl portion has 1 to 9 carbon atoms), and r is an integer of 1 to 5, preferably 1 to 3.]

[0037] [ka] [ka]

[0038] [In the formulas [4] and [5], Y is -RO-, -R-CO-O-, or -RO-CO-, where R represents a single bond or a divalent aliphatic hydrocarbon group having 1 to 10 carbon atoms, preferably 1 to 5 carbon atoms, and n represents an integer of 10 to 50.]

[0039] Specific examples of the monofunctional phenols represented by the formula [3] include phenol, isopropylphenol, p-tert-butylphenol, p-cresol, p-cumylphenol, 2-phenylphenol, 4-phenylphenol, and isooctylphenol.

[0040] Furthermore, the monofunctional phenols represented by the formula [4] or [5] are phenols having a long-chain alkyl group or an aliphatic ester group as a substituent. When these are used to block the ends of polycarbonate resin, they not only function as an end terminator or molecular weight modifier, but also improve the melt fluidity of the resin, facilitating molding and processing, and have the effect of lowering the water absorption of the resin, and are therefore preferably used.

[0041] The substituted phenols of the formula [4] are preferably those in which n is 10 to 30, particularly 10 to 26, and specific examples thereof include decylphenol, dodecylphenol, tetradecylphenol, hexadecylphenol, octadecylphenol, eicosylphenol, docosylphenol, and triacontylphenol.

[0042] As the substituted phenol of the formula [5], a compound in which Y is -R-COO- and R is a single bond is suitable, and those in which n is 10 to 30, particularly 10 to 26, are preferred, and specific examples thereof include decyl hydroxybenzoate, dodecyl hydroxybenzoate, tetradecyl hydroxybenzoate, hexadecyl hydroxybenzoate, eicosyl hydroxybenzoate, docosyl hydroxybenzoate, and triacontyl hydroxybenzoate.

[0043] Among these monofunctional phenols, the monofunctional phenols represented by the formula [3] are preferred, more preferably alkyl-substituted or phenylalkyl-substituted phenols, and particularly preferably p-tert-butylphenol, p-cumylphenol or 2-phenylphenol.

[0044] It is desirable that these monofunctional phenolic end-capping agents be introduced into the terminals in an amount of at least 5 mol %, preferably at least 10 mol %, based on the total terminals of the obtained polycarbonate resin. The end-capping agents may be used alone or in combination of two or more.

[0045] The polycarbonate resin used as component A of the present invention may be a polyester carbonate copolymerized with an aromatic dicarboxylic acid, such as terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, or a derivative thereof, within the scope of the present invention.

[0046] The viscosity-average molecular weight of the polycarbonate resin used as Component A of the present invention is preferably in the range of 11,500 to 50,000, more preferably 12,000 to 30,000, still more preferably 13,000 to 25,000, and most preferably 14,000 to 21,000. If the molecular weight exceeds the upper limit, the melt viscosity may become too high and the moldability may be poor. If the molecular weight is less than the lower limit, problems may occur in mechanical strength. The viscosity-average molecular weight referred to in the present invention is first obtained by using an Ostwald viscometer from a solution prepared by dissolving 0.7 g of the polycarbonate resin in 100 ml of methylene chloride at 20°C to obtain the specific viscosity calculated by the following formula, and then inserting the obtained specific viscosity into the following formula to obtain the viscosity-average molecular weight Mv. Specific viscosity (η SP ) = (t - t0) / t0 [t0 is the dropping time of methylene chloride, t is the dropping time of the sample solution] η SP / c = [η] + 0.45×[η] 2 c (where [η] is the intrinsic viscosity) [η] = 1.23×10 -4 Mv 0.83 c = 0.7

[0047] The total amount of Cl (chlorine) in the polycarbonate resin used as Component A of the present invention is preferably 0 to 500 ppm, more preferably 0 to 350 ppm. When the total amount of Cl in the polycarbonate resin is within the above range, it is excellent in hue and thermal stability and is preferable.

[0048] <Component B: Triarylphosphine Compound> The triarylphosphine compound used as Component B of the present invention is a triarylphosphine having a specific structure represented by the following formula [1]. The polycarbonate resin composition and the polycarbonate resin molded product obtained by blending the triarylphosphine having this structure are suppressed in discoloration when exposed to a long-term high-temperature environment. In addition, by using the pentaerythritol diphosphite compound of Component C in combination, there is an effect of enhancing transparency and light guiding performance by suppressing yellowing during molding.

[0049] [ka]

[0050] [In the formula, R 2-1 , R 2-2 , R 2-3 , R 6-1 , R 6-2 , R 6-3 , R 0-1 , R 0-2 , R 0-3 are hydrogen atoms, hydrocarbon groups, alkoxy groups or halogens, and may be the same or different. 2-1 , R 2-2 , R 2-3 , R 6-1 , R 6-2 , R 6-3 At least one of p, q, and r is a hydrocarbon group, an alkoxy group, or a halogen atom. p, q, and r are each an integer of 0 to 3.]

[0051] The hydrocarbon group is preferably an alkyl group, an aralkyl group, an alkenyl group or an aryl group.

[0052] Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, a dodecyl group, a tetradecyl group, etc. An alkyl group having 1 to 18 carbon atoms is preferred, an alkyl group having 1 to 12 carbon atoms is more preferred, an alkyl group having 1 to 8 carbon atoms is even more preferred, an alkyl group having 1 to 6 carbon atoms is particularly preferred, and an alkyl group having 1 to 4 carbon atoms is most preferred.

[0053] Examples of the aralkyl group include a benzyl group, a phenylethyl group, etc. An aralkyl group having 7 to 20 carbon atoms is preferred, an aralkyl group having 7 to 15 carbon atoms is more preferred, and an aralkyl group having 7 to 10 carbon atoms is even more preferred.

[0054] Examples of the alkenyl group include a methenyl group, an ethenyl group, a propenyl group, a butenyl group, a pentenyl group, etc. An alkenyl group having 2 to 10 carbon atoms is preferred, and an alkenyl group having 2 to 6 carbon atoms is more preferred.

[0055] Examples of the aryl group include a phenyl group, a naphthyl group, etc. An aryl group having 6 to 14 carbon atoms is preferred, and an aryl group having 6 to 10 carbon atoms is more preferred.

[0056] Examples of the alkoxy group include a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentoxy group, etc. An alkoxy group having 1 to 10 carbon atoms is preferred, and an alkoxy group having 1 to 6 carbon atoms is more preferred.

[0057] Examples of the halogen atom include a fluorine atom, a chlorine atom, and a bromine atom.

[0058] In addition, in the formula [1], R 2-1 , R 2-2 , R 2-3 , R 6-1 , R 6-2 , R 6-3 At least one of the groups is a hydrocarbon group, an alkoxy group, or a halogen atom, and is preferably an alkyl group or an alkoxy group, and is particularly preferably an alkyl group having 1 to 4 carbon atoms.

[0059] p, q and r each represent an integer of 0 to 3, preferably an integer of 0 to 2, and more preferably 0 or 1.

[0060] Specifically, the triarylphosphine of the formula [1] is preferably at least one selected from the group consisting of tri(o-tolyl)phosphine, tri(2,4-xylyl)phosphine, and tri(2,5-xylyl)phosphine, and more preferably tri(o-tolyl)phosphine or tri(2,5-xylyl)phosphine.

[0061] The content of the triarylphosphine is 0.005 to 0.3 parts by weight, preferably 0.008 to 0.2 parts by weight, and more preferably 0.01 to 0.1 parts by weight, based on 100 parts by weight of the polycarbonate resin of Component A. If it is less than the above range, the discoloration suppression effect when exposed to a long-term high-temperature environment becomes small. If it exceeds the above range, the triarylphosphine volatilized when heat is applied during molding processing or the like adheres to the mold, causing defects in the molded product and deteriorating the moisture and heat resistance.

[0062] <Component C: Pentaerythritol diphosphite compound> The pentaerythritol diphosphite compound used as Component C of the present invention is blended mainly for the purpose of suppressing discoloration at high temperatures when processing the resin composition of the present invention into pellets using a melt kneader typified by a vented twin-screw extruder or when processing it into a desired molded product using an injection molding machine or the like.

[0063] In addition, by using the pentaerythritol diphosphite compound of Component C and the triarylphosphine compound having a specific structure of Component B in combination, there is an effect of further enhancing the light guiding performance by suppressing yellowing during molding processing.

[0064] Specifically used dipentaerythritol diphosphite compounds include distearyl pentaerythritol diphosphite, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-ethylphenyl)pentaerythritol diphosphite, bis(2,4-dicumylphenyl)pentaerythritol diphosphite, phenyl bisphenol A pentaerythritol diphosphite, bis(nonylphenyl)pentaerythritol diphosphite, dicyclohexyl pentaerythritol diphosphite, and the like.

[0065] Among them, it is preferably at least one selected from the group consisting of bis(2,4-dicumylphenyl)pentaerythritol diphosphite and bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, and bis(2,4-dicumylphenyl)pentaerythritol diphosphite is particularly preferred.

[0066] The content of the pentaerythritol diphosphite-based compound is 0.001 to 0.08 parts by weight, preferably 0.005 to 0.05 parts by weight, and more preferably 0.01 to 0.03 parts by weight with respect to 100 parts by weight of the polycarbonate resin of Component A. If it is less than the above range, the discoloration suppression effect during molding processing and the like becomes small, the light guiding performance deteriorates, and if it exceeds the above range, the mechanical properties of the material decrease, the dry heat resistance and the wet heat resistance deteriorate, and further mold contamination during molding is likely to occur, which is not preferable.

[0067] <Component D: Epoxy group-containing compound> The epoxy group-containing compound used as Component D of the present invention is compounded for the purpose of improving the wet heat resistance of the polycarbonate resin composition, and can also suppress mold corrosion. Basically, all those having an epoxy functional group can be applied.

[0068] In addition, by using the epoxy group-containing compound of Component D and the triarylphosphine-based compound having a specific structure of Component B in combination, there is an effect of further improving the wet heat resistance.

[0069] Specific examples of preferable epoxy group-containing compounds include 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexyl carboxylate, 1,2-epoxy-4-(2-oxiranyl)cyclohexane adduct of 2,2-bis(hydroxymethyl)-1-butanol, copolymer of methyl methacrylate and glycidyl methacrylate, copolymer of styrene and glycidyl methacrylate, and the like.

[0070] The addition amount of the epoxy group-containing compound is 0.005 to 0.3 parts by weight, preferably 0.008 to 0.2 parts by weight, and more preferably 0.01 to 0.1 parts by weight, based on 100 parts by weight of the polycarbonate resin of Component A.

[0071] <Component E: Fatty acid ester compound> In the polycarbonate resin composition of the present invention, a fatty acid ester compound composed of a polyhydric alcohol and a higher fatty acid, which is Component E, can be blended as necessary within a range not impairing the effects of the present invention.

[0072] The polyhydric alcohol constituting the fatty acid ester compound preferably has 3 to 32 carbon atoms. Specific examples of such polyhydric alcohols include glycerin, diglycerin, polyglycerin (e.g., decaglycerin, etc.), pentaerythritol, dipentaerythritol, diethylene glycol, and propylene glycol.

[0073] The higher fatty acid constituting the fatty acid ester compound is preferably an aliphatic carboxylic acid having 10 to 32 carbon atoms. Specific examples thereof include saturated aliphatic carboxylic acids such as decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid (palmitic acid), heptadecanoic acid, octadecanoic acid (stearic acid), nonadecanoic acid, eicosanoic acid, docosanoic acid, hexacosanoic acid, etc., and unsaturated aliphatic carboxylic acids such as palmitoleic acid, oleic acid, linoleic acid, linolenic acid, eicosenoic acid, eicosapentaenoic acid, cetoleic acid, etc.

[0074] Among these, aliphatic carboxylic acids having 10 to 22 carbon atoms are more preferred, and those having 14 to 20 carbon atoms are even more preferred. Furthermore, saturated aliphatic carboxylic acids having 14 to 20 carbon atoms are preferred, with stearic acid and palmitic acid being particularly preferred. Aliphatic carboxylic acids such as stearic acid are often usually in the form of a mixture containing other carboxylic acid components having different numbers of carbon atoms. Among the saturated fatty acid esters, ester compounds obtained from stearic acid or palmitic acid, which are produced from such natural fats and oils and are in the form of a mixture containing other carboxylic acid components, are also preferably used.

[0075] Specifically, the fatty acid ester compound to be used is preferably glycerin monostearate, glycerin tristearate, or pentaerythritol tetrastearate, and more preferably glycerin monostearate or pentaerythritol tetrastearate.

[0076] The content of the fatty acid ester compound is preferably 0.01 to 1 part by weight, more preferably 0.02 to 0.5 parts by weight, even more preferably 0.03 to 0.3 parts by weight, and particularly preferably 0.05 to 0.2 parts by weight, relative to 100 parts by weight of the polycarbonate resin of component A. If the amount of fatty acid ester compound is less than the above range, depending on the molding method, mold releasability during molding may be insufficient, resulting in molding defects. On the other hand, if the amount of fatty acid ester compound is more than the above range, discoloration may occur during molding, and light-guiding performance or dry heat resistance may be impaired.

[0077] <Other ingredients> The polycarbonate resin composition of the present invention may contain known additives for imparting various functions to the molded article or improving its properties, as long as the purpose of the present invention is not impaired. These additives will be described in detail below.

[0078] (I) Other heat stabilizers The polycarbonate resin composition of the present invention can contain various known heat stabilizers, such as phosphorus-based antioxidants other than component C, sulfur-based antioxidants, and phenol-based antioxidants.

[0079] Specific examples of such phosphorus-based antioxidants include phosphorous acid (phosphite), phosphonite, phosphinite, phosphine, phosphoric acid (phosphate), phosphonate, phosphinate, and phosphine oxide, and among these, phosphites, phosphonites, phosphines, phosphonates, and phosphates are preferably used. Specific examples of the phosphite compound include trimethyl phosphite, triethyl phosphite, tripropyl phosphite, triisopropyl phosphite, tributyl phosphite, triphenyl phosphite, tris(nonylphenyl)phosphite, tridecyl phosphite, trioctyl phosphite, trioctadecyl phosphite, didecyl monophenyl phosphite, dioctyl monophenyl phosphite, diisopropyl monophenyl phosphite, monobutyl diphenyl phosphite, monodecyl diphenyl phosphite, monooctyl diphenyl phosphite, 2,2-methylenebis(4,6-di-tert-butylphenyl)octyl phosphite, tris(diethylphenyl)phosphite, tris(di-isopropylphenyl)phosphite, tris(di-n-butylphenyl)phosphite, tris(2,4-di-tert-butylphenyl)phosphite, and tris(2,6-di-tert-butylphenyl)phosphite. Other phosphite compounds that react with dihydric phenols to form a cyclic structure can also be used, such as 2,2'-methylenebis(4,6-di-tert-butylphenyl)(2,4-di-tert-butylphenyl)phosphite, 2,2'-methylenebis(4,6-di-tert-butylphenyl)(2-tert-butyl-4-methylphenyl)phosphite, 2,2'-methylenebis(4-methyl-6-tert-butylphenyl)(2-tert-butyl-4-methylphenyl)phosphite, and 2,2'-ethylidenebis(4-methyl-6-tert-butylphenyl)(2-tert-butyl-4-methylphenyl)phosphite.

[0080] Examples of phosphonite compounds include tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylene diphosphonite, tetrakis(2,4-di-tert-butylphenyl)-4,3'-biphenylene diphosphonite, tetrakis(2,4-di-tert-butylphenyl)-3,3'-biphenylene diphosphonite, tetrakis(2,6-di-tert-butylphenyl)-4,4'-biphenylene diphosphonite, tetrakis(2,6-di-tert-butylphenyl)-4,3'-biphenylene diphosphonite, tetrakis(2,6-di-tert-butylphenyl)-3,3'-biphenylene diphosphonite, bis(2,4-di-tert-butylphenyl)-4-phenyl ... Examples of suitable phosphonite compounds include (2,4-di-tert-butylphenyl)-3-phenyl-phenylphosphonite, bis(2,6-di-n-butylphenyl)-3-phenyl-phenylphosphonite, bis(2,6-di-tert-butylphenyl)-4-phenyl-phenylphosphonite, and bis(2,6-di-tert-butylphenyl)-3-phenyl-phenylphosphonite. Among these, tetrakis(di-tert-butylphenyl)-biphenylene diphosphonite and bis(di-tert-butylphenyl)-phenyl-phenylphosphonite are preferred, with tetrakis(2,4-di-tert-butylphenyl)-biphenylene diphosphonite and bis(2,4-di-tert-butylphenyl)-phenyl-phenylphosphonite being more preferred. Such phosphonite compounds can be used in combination with, and are preferred for, the above-mentioned phosphite compounds having an aryl group substituted with two or more alkyl groups.

[0081] Examples of the phosphine compound include triethylphosphine, tripropylphosphine, tributylphosphine, trioctylphosphine, triamylphosphine, dimethylphenylphosphine, dibutylphenylphosphine, diphenylmethylphosphine, diphenyloctylphosphine, triphenylphosphine, tris(p-tolyl)phosphine, tris(p-anisyl)phosphine, trinaphthylphosphine, and diphenylbenzylphosphine. A particularly preferred phosphine compound is triphenylphosphine.

[0082] Examples of the phosphonate compound include dimethyl benzenephosphonate, diethyl benzenephosphonate, and dipropyl benzenephosphonate.

[0083] Examples of the phosphate compound include tributyl phosphate, trimethyl phosphate, tricresyl phosphate, triphenyl phosphate, trichlorophenyl phosphate, triethyl phosphate, diphenyl cresyl phosphate, diphenyl monoorthoxenyl phosphate, tributoxyethyl phosphate, dibutyl phosphate, dioctyl phosphate, and diisopropyl phosphate, and preferred are triphenyl phosphate and trimethyl phosphate.

[0084] Specific examples of sulfur-based antioxidants include pentaerythritol tetrakis(3-laurylthiopropionate), pentaerythritol tetrakis(3-myristylthiopropionate), and pentaerythritol tetrakis(3-stearylthiopropionate). Among these, pentaerythritol tetrakis(3-laurylthiopropionate), pentaerythritol tetrakis(3-myristylthiopropionate) dilauryl-3,3'-thiodipropionate, and dimyristyl-3,3'-thiodipropionate are particularly preferred. Among these, pentaerythritol tetrakis(3-laurylthiopropionate), pentaerythritol tetrakis(3-myristylthiopropionate), dilauryl-3,3'-thiodipropionate, and dimyristyl-3,3'-thiodipropionate are preferred, and pentaerythritol tetrakis(3-laurylthiopropionate) and dimyristyl-3,3'-thiodipropionate are particularly preferred.

[0085] Specific examples of phenolic antioxidants include vitamin E, n-octadecyl-β-(4'-hydroxy-3',5'-di-tert-butylphenyl)propionate, 2-tert-butyl-6-(3'-tert-butyl-5'-methyl-2'-hydroxybenzyl)-4-methylphenylacrylate, 2,6-di-tert-butyl-4-(N,N-dimethylaminomethyl)phenol, 3,5-di-tert-butyl-4-hydroxybenzylphosphonate diethyl ester, 2,2'-methylenebis(4-methyl-6-tert-butyl Phenol), 2,2'-methylenebis(4-ethyl-6-tert-butylphenol), 4,4'-methylenebis(2,6-di-tert-butylphenol), 2,2'-methylenebis(4-methyl-6-cyclohexylphenol), 2,2'-dimethylene-bis(6-α-methyl-benzyl-p-cresol) 2,2'-ethylidene-bis(4,6-di-tert-butylphenol), 2,2'-butylidene-bis(4-methyl-6-tert-butylphenol), 4,4'-butylidenebis(3-methyl-6-tert-butylphenol) ), triethylene glycol-N-bis-3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate, 1,6-hexanediol bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, bis[2-tert-butyl-4-methyl 6-(3-tert-butyl-5-methyl-2-hydroxybenzyl)phenyl]terephthalate, 3,9-bis{2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]-1,1-dimethylethyl}-2,4,8,10 -Tetraoxaspiro[5,5]undecane, 4,4'-thiobis(6-tert-butyl-m-cresol), 4,4'-thiobis(3-methyl-6-tert-butylphenol), 2,2'-thiobis(4-methyl-6-tert-butylphenol), bis(3,5-di-tert-butyl-4-hydroxybenzyl) sulfide, 4,4'-di-thiobis(2,6-di-tert-butylphenol), 4,4'-tri-thiobis(2,6-di-tert-butylphenol), 2,4-bis(n-octylthio)-6-(4-hydroxy-3',5'-di-tert-butylanilino)-1,3,5-triazine, N,N'-hexamethylenebis-(3,5-di-tert-butyl-4-hydroxyhydrocinnamide), N,N'-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine, 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, tris(3,5-di-tert-butyl-4- Examples of suitable isocyanurates include tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanurate, 1,3,5-tris-2[3(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxy]ethyl isocyanurate, and tetrakis[methylene-3-(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate]methane.

[0086] The phosphorus-based antioxidants, sulfur-based antioxidants, and phenol-based antioxidants other than the above-mentioned Component C can each be used alone or in combination of two or more. The content of these phosphorus-based antioxidants, sulfur-based antioxidants, and phenol-based antioxidants is preferably 0.0001 to 1 part by weight per 100 parts by weight of Component A, more preferably 0.0005 to 0.5 parts by weight, and even more preferably 0.001 to 0.2 parts by weight.

[0087] (II) Mold release agent The polycarbonate resin composition of the present invention can contain a release agent other than Component E, if necessary. Such a release agent can be one known per se. Examples include polyolefin waxes (such as polyethylene waxes or 1-alkene polymers. These may also be modified with functional group-containing compounds, such as acid-modified waxes), silicone compounds, fluorine compounds, paraffin wax, and beeswax. Among these, linear or cyclic polydimethylsiloxane oils, polymethylphenylsilicone oils, and fluorine oils are preferred. The content of such a release agent other than Component E is preferably 0.01 to 1 part by weight per 100 parts by weight of Component A.

[0088] (III) UV absorbers The polycarbonate resin composition of the present invention can contain an ultraviolet absorber, if necessary. Examples of such ultraviolet absorbers include benzophenone-based ultraviolet absorbers such as 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 2-hydroxy-4-n-dodecyloxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-2'-carboxybenzophenone, 2-hydroxy-4-methoxy-5-sulfoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxy-5-sodium sulfoxybenzophenone, and bis(5-benzoyl-4-hydroxy-2-methoxyphenyl)methane.

[0089] Examples of ultraviolet absorbers include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-butylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-amylphenyl)benzotriazole, 2-(2'-hydroxy-3'-dodecyl-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-bis(α,α'- benzotriazole-based ultraviolet absorbers such as 2-[2'-hydroxy-3'-(3",4",5",6"-tetraphthalimidomethyl)-5'-methylphenyl]benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, and 2,2'methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazol-2-yl)phenol].

[0090] Further examples of the ultraviolet absorber include hydroxyphenyltriazine compounds such as 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexyloxy-phenol and 2-(4,6-bis-(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-hexyloxy-phenol, and malonic acid ester compounds such as 2-(1-arylalkylidene)malonic acid esters such as Hostavin PR-25 manufactured by Clariant Japan and Hostavin B-CAP manufactured by Clariant Japan.

[0091] The content of the ultraviolet absorber is preferably 0.01 to 5 parts by weight, and more preferably 0.02 to 1 part by weight, per 100 parts by weight of the component A.

[0092] (IV) Light stabilizers The polycarbonate resin composition of the present invention may contain a light stabilizer as needed. Examples of such light stabilizers include bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidyl)-2-(3,5-di-tert-butyl-4-hydroxybenzyl)-2n-butylmalonate, a condensation product of 1,2,3,4-butanecarboxylic acid, 2,2,6,6-tetramethyl-4-piperidinol, and tridecyl alcohol, and a condensation product of 1,2,3,4-butanedicarboxylic acid and 1,2,2,6,6- Condensation product of pentamethyl-4-piperidinol and tridecyl alcohol, tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate, tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate, poly{[6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethylpiperidyl)imino]hexamethylene[(2,2,6,6-tetramethylpiperidyl)imino]hexamethylene Poly{[6-morpholino-s-triazine-2,4-diyl][(2,2,6,6-tetramethylpiperidyl)imino]hexamethylene[(2,2,6,6-tetramethylpiperidyl)imino]}, condensation product of 1,2,3,4-butanetetracarboxylic acid, 2,2,6,6-tetramethyl-4-piperidinol and β,β,β',β'-tetramethyl-3,9-(2,4,8,10-tetraoxaspiro[5,5]undecane)diethanol, N,N'-bis(3-aminopropyl)ethylenediamine and 2,4- Examples of hindered amines include a condensation product of bis[N-butyl-N-(1,2,2,6,6-pentamethyl-4-piperidyl)amino]-chloro-1,3,5-triazine, a condensation product of 1,2,3,4-butanetetracarboxylic acid, 1,2,2,6,6-pentamethyl-4-piperidinol, and β,β,β',β'-tetramethyl-3,9-(2,4,8,10-tetraoxaspiro[5,5]undecane)diethanol, and polymethylpropyl 3-oxy-[4-(2,2,6,6-tetramethyl)piperidinyl]siloxane.The content of the light stabilizer is preferably 0.001 to 5 parts by weight, and more preferably 0.005 to 1 part by weight, per 100 parts by weight of the component A.

[0093] (V) Bluing agent The polycarbonate resin composition of the present invention can be blended with a bluing agent to counteract the yellowish color due to the ultraviolet absorber or the like. Any bluing agent typically used in polycarbonate resins can be used without any particular problems. In general, anthraquinone dyes are easily available and are therefore preferred. Specific examples of bluing agents include Solvent Violet 13 (CA. No. (Color Index No.) 60725; trademarks of Bayer's Macrolex Violet B, Mitsubishi Chemical's Diaresin Blue G, and Sumitomo Chemical's Sumiplast Violet B), Solvent Violet 31 (CA. No. 68210; trademark of Mitsubishi Chemical's Diaresin Violet D), Solvent Violet 33 (CA. No. 60725; trademark of Mitsubishi Chemical's Diaresin Blue J), Solvent Blue 94 (CA. No. 61500; trademark of Mitsubishi Chemical's Diaresin Blue N), Solvent Violet 36 (CA. No. 68210; trademark of Bayer's Macrolex Violet 3R), and Solvent Blue 97 (trademark of Examples include Macrolex Blue RR (manufactured by Bayer) and Solvent Blue 45 (CA. No. 61110; trade name: Terazol Blue RLS (manufactured by Sandoz)), with Macrolex Blue RR, Macrolex Violet B, and Terazol Blue RLS being particularly preferred. The content of the bluing agent is preferably 0.000005 to 0.001 part by weight, and more preferably 0.00001 to 0.0001 part by weight, per 100 parts by weight of component A.

[0094] (VI) Fluorescent whitening agents In the polycarbonate resin composition of the present invention, the fluorescent brightening agent is not particularly limited as long as it is used to improve the color tone of the resin or the like to white or bluish white. Examples include stilbene-based, benzimidazole-based, benzoxazole-based, naphthalimide-based, rhodamine-based, coumarin-based, and oxazine-based compounds. Specific examples include CI Fluorescent Brightener 219:1, Eastman Chemical Company's EASTOBRITE OB-1, and Showa Chemical Industry Co.'s "HAKKOL PSR." The fluorescent brightening agent absorbs ultraviolet energy in light and radiates this energy in the visible region. The content of the fluorescent brightening agent is preferably 0.001 to 0.1 parts by weight, more preferably 0.001 to 0.05 parts by weight, per 100 parts by weight of Component A.

[0095] (VII) Organic metal salts An organic metal salt compound can be blended into the polycarbonate resin composition of the present invention. Such organic metal salts are blended for the purpose of imparting flame retardancy. They are preferably alkali (earth) metal salts of organic acids having 1 to 50 carbon atoms, preferably 1 to 40 carbon atoms, and more preferably alkali (earth) metal salts of organic sulfonic acids. Examples of alkali (earth) metal salts of organic sulfonic acids include metal salts of fluorine-substituted alkylsulfonic acids, such as metal salts of perfluoroalkylsulfonic acids having 1 to 10 carbon atoms, preferably 2 to 8 carbon atoms, with alkali metals or alkaline earth metals, and metal salts of aromatic sulfonic acids having 7 to 50 carbon atoms, preferably 7 to 40 carbon atoms, with alkali metals or alkaline earth metals. Examples of alkali metals constituting the metal salts include lithium, sodium, potassium, rubidium, and cesium, and examples of alkaline earth metals include beryllium, magnesium, calcium, strontium, and barium. Alkali metals are more preferred. Among these alkali metals, rubidium and cesium, which have larger ionic radii, are preferred when higher transparency is required. However, these metals are not widely used and are difficult to purify, which can result in cost disadvantages. On the other hand, metals with smaller ionic radii, such as lithium and sodium, can be disadvantageous in terms of flame retardancy. Taking these factors into consideration, different alkali metals can be used in alkali metal sulfonates. However, potassium sulfonate, which has an excellent balance of properties in all respects, is most preferred. Such potassium salts can also be used in combination with alkali metal sulfonates made from other alkali metals.

[0096] Specific examples of alkali metal salts of perfluoroalkylsulfonates include potassium trifluoromethanesulfonate, potassium perfluorobutanesulfonate, potassium perfluorohexanesulfonate, potassium perfluorooctane sulfonate, sodium pentafluoroethanesulfonate, sodium perfluorobutanesulfonate, sodium perfluorooctane sulfonate, lithium trifluoromethanesulfonate, lithium perfluorobutanesulfonate, lithium perfluoroheptanesulfonate, cesium trifluoromethanesulfonate, cesium perfluorobutanesulfonate, cesium perfluorooctane sulfonate, cesium perfluorohexanesulfonate, rubidium perfluorobutanesulfonate, and rubidium perfluorohexanesulfonate, and these can be used alone or in combination of two or more. Here, the number of carbon atoms in the perfluoroalkyl group is preferably in the range of 1 to 18, more preferably in the range of 1 to 10, and even more preferably in the range of 1 to 8. Among these, potassium perfluorobutanesulfonate is particularly preferred. Perfluoroalkylsulfonic acid alkali (earth) metal salts made from alkali metals usually contain a significant amount of fluoride ions. The presence of such fluoride ions can reduce flame retardancy, so it is preferable to reduce their content as much as possible. The proportion of such fluoride ions can be measured by ion chromatography. The fluoride ion content is preferably 100 ppm or less, more preferably 40 ppm or less, and particularly preferably 10 ppm or less. For efficient production, a fluoride ion content of 0.2 ppm or more is preferable. Such perfluoroalkylsulfonic acid alkali (earth) metal salts with reduced fluoride ion content can be produced using known production methods, including reducing the amount of fluoride ions contained in raw materials when producing a fluorine-containing organometallic salt, removing hydrogen fluoride and other products obtained by the reaction using gas generated during the reaction or by heating, and reducing the amount of fluoride ions during the production of a fluorine-containing organometallic salt using purification methods such as recrystallization and reprecipitation.In particular, organometallic salt flame retardants are relatively soluble in water, so it is preferable to use ion-exchanged water, particularly water with an electrical resistance of 18 MΩ·cm or more, i.e., an electrical conductivity of approximately 0.55 μS / cm or less, and dissolve and wash the material at a temperature higher than room temperature, followed by cooling and recrystallization to produce the material.

[0097] Specific examples of the alkali (earth) metal salts of aromatic sulfonates include disodium diphenyl sulfide-4,4'-disulfonate, dipotassium diphenyl sulfide-4,4'-disulfonate, potassium 5-sulfoisophthalate, sodium 5-sulfoisophthalate, polysodium polyethylene terephthalate polysulfonate, calcium 1-methoxynaphthalene-4-sulfonate, disodium 4-dodecylphenyl ether disulfonate, polysodium poly(2,6-dimethylphenylene oxide) polysulfonate, polysodium poly(1,3-phenylene oxide) polysulfonate, polysodium poly(1,4-phenylene oxide) polysulfonate, polypotassium poly(2,6-diphenylphenylene oxide) polysulfonate, lithium poly(2-fluoro-6-butylphenylene oxide) polysulfonate, potassium sulfonate of benzenesulfonate, sodium benzenesulfonate, and benzenesulfonic acid Examples of suitable sulfonates include strontium, magnesium benzenesulfonate, dipotassium p-benzenedisulfonate, dipotassium naphthalene-2,6-disulfonate, calcium biphenyl-3,3'-disulfonate, sodium diphenylsulfone-3-sulfonate, potassium diphenylsulfone-3-sulfonate, dipotassium diphenylsulfone-3,3'-disulfonate, dipotassium diphenylsulfone-3,4'-disulfonate, sodium α,α,α-trifluoroacetophenone-4-sulfonate, dipotassium benzophenone-3,3'-disulfonate, disodium thiophene-2,5-disulfonate, dipotassium thiophene-2,5-disulfonate, calcium thiophene-2,5-disulfonate, sodium benzothiophenesulfonate, potassium diphenylsulfoxide-4-sulfonate, a formalin condensate of sodium naphthalenesulfonate, and a formalin condensate of sodium anthracenesulfonate. Of these alkali (earth) metal salts of aromatic sulfonic acid, potassium salts are particularly preferred.Among these alkali (earth) metal salts of aromatic sulfonates, potassium diphenylsulfone-3-sulfonate and dipotassium diphenylsulfone-3,3'-disulfonate are preferred, and mixtures thereof (with a weight ratio of the former to the latter of 15 / 85 to 30 / 70) are particularly preferred.

[0098] Suitable examples of organic metal salts other than alkali(earth) metal sulfonates include alkali(earth) metal salts of sulfates and alkali(earth) metal salts of aromatic sulfonamides. Examples of alkali(earth) metal salts of sulfates include alkali(earth) metal salts of sulfates of monohydric and / or polyhydric alcohols. Examples of sulfates of monohydric and / or polyhydric alcohols include methyl sulfate, ethyl sulfate, lauryl sulfate, hexadecyl sulfate, sulfates of polyoxyethylene alkylphenyl ethers, mono-, di-, tri-, and tetrasulfates of pentaerythritol, sulfates of lauric acid monoglyceride, sulfates of palmitic acid monoglyceride, and sulfates of stearic acid monoglyceride. Examples of alkali(earth) metal salts of these sulfates include alkali(earth) metal salts of lauryl sulfate. Examples of alkali (earth) metal salts of aromatic sulfonamides include saccharin, N-(p-tolylsulfonyl)-p-toluenesulfonimide, N-(N'-benzylaminocarbonyl)sulfanilimide, and alkali (earth) metal salts of N-(phenylcarboxyl)sulfanilimide. The content of the organic metal salt is preferably 0.001 to 1 part by weight, more preferably 0.005 to 0.5 parts by weight, even more preferably 0.01 to 0.3 parts by weight, and particularly preferably 0.03 to 0.15 parts by weight, per 100 parts by weight of component A.

[0099] (VIII) Polycaprolactone compounds The polycarbonate resin composition of the present invention can contain a polycaprolactone compound. Such polycaprolactone compounds have the effect of improving thermal stability when subjected to heat history, such as during molding and processing. Some of the hydrogen atoms in the methylene chain of the polycaprolactone repeating unit (—CH—CH—CH—CH—CH—CH—C(O)—O—) may be substituted with halogen atoms or hydrocarbon groups. Furthermore, the terminal OH groups of the polycaprolactone compound may be subjected to terminal treatment such as esterification or etherification. The polycaprolactone compound may have a bifunctional, trifunctional, or tetrafunctional structure, such as polycaprolactone diol, polycaprolactone triol, or polycaprolactone tetraol. The molecular weight of the polycaprolactone compound, as measured by GPC and converted into polystyrene equivalent, is in the range of 300 to 5,000, with those in the range of 500 to 4,000 being preferred. The amount of such polycaprolactone compound is preferably in the range of 0.2 to 1.5 parts by weight per 100 parts by weight of Component A.

[0100] (IX) Polyalkylene glycol compounds The polycarbonate resin composition of the present invention can contain a polyalkylene glycol compound. Such polyalkylene glycol compounds have the effect of improving thermal stability when subjected to heat history, such as during molding and processing. Specific examples include polyalkylene glycols having 2 to 6 carbon atoms, such as polyethylene glycol, polypropylene glycol, and polytetramethylene glycol, and their derivatives. The terminal OH groups of the polyalkylene glycol may be subjected to terminal treatment, such as esterification or etherification. The molecular weight of the polyalkylene glycol, as calculated as a number average molecular weight in terms of polystyrene by GPC, is in the range of 300 to 5,000, with those in the range of 500 to 4,000 being preferred. The amount of such polyalkylene glycol compound is preferably in the range of 0.2 to 1.5 parts by weight per 100 parts by weight of Component A.

[0101] (X) Other In addition to the above, known additives can be blended into the resin composition of the present invention to impart various functions to the molded article or improve its properties, as long as the objectives of the present invention are not impaired. Such additives include reinforcing fillers, sliding agents (e.g., PTFE particles), colorants, fluorescent dyes, inorganic phosphors (e.g., phosphors with aluminate as the host crystal), antistatic agents, crystal nucleating agents, inorganic and organic antibacterial agents, photocatalytic antifouling agents (e.g., fine particle titanium oxide, fine particle zinc oxide), light diffusing agents, flow modifiers, radical generators, infrared absorbers (heat ray absorbers), and photochromic agents.

[0102] <Production of Polycarbonate Resin Composition> Any method can be used to produce the polycarbonate resin composition of the present invention. Examples include thoroughly mixing components A, B, C, D, and optional other components using a premixing device such as a V-type blender, Henschel mixer, mechanochemical device, or extrusion mixer, followed by granulation using an extrusion granulator or briquetting machine, if necessary, followed by melt-kneading using a melt mixer such as a vented twin-screw extruder, and pelletizing using a pelletizer or other device. Other methods include independently feeding components A, B, C, D, and optional other components to a melt mixer such as a vented twin-screw extruder, premixing a portion of component A and the other components and then feeding the remaining components to the melt mixer, diluting and mixing components B, C, D, and optional other components with water or an organic solvent and then feeding the mixture to the melt mixer, or premixing the diluted mixture with the other components and then feeding the mixture to the melt mixer. When the components to be blended are liquid, a so-called liquid injection device or liquid addition device can be used to supply the components to the melt kneader.

[0103] <Manufacturing of molded products> To produce a molded article made of the polycarbonate resin composition of the present invention, any method can be adopted. For example, after kneading the polycarbonate resin composition with an extruder, a Banbury mixer, a roll, or the like, a molded article can be produced by a conventionally known method such as injection molding, extrusion molding, or compression molding.

[0104] The molded article molded from the resin composition of the present invention can be suitably used for various industrial applications such as the lighting field including LED lighting, the OA equipment field, the electric and electronic equipment field, the automotive field, and the building materials field.

Examples

[0105] Examples are given below for further explanation, but the present invention is not limited to these examples. The details of each component used and the evaluation method are as follows.

[0106] <Component A> A-1: Bisphenol A type aromatic polycarbonate resin (Manufactured by Teijin Chemicals, Ltd., CM-1000, viscosity average molecular weight 15,000) A-2: Bisphenol A type aromatic polycarbonate resin blended at a ratio of 50 parts by weight of the above A-1 and 50 parts by weight of the following A-3 and adjusted to a viscosity average molecular weight equivalent to 17,000 A-3: Bisphenol A type aromatic polycarbonate resin (Manufactured by Teijin Chemicals, Ltd., L-1225WL, viscosity average molecular weight 18,500) A-4: Bisphenol A type aromatic polycarbonate resin (Manufactured by Teijin Chemicals, Ltd.: L-1225WX, viscosity average molecular weight 20,000)

[0107] <Component B> B-1: Tri(o-tolyl)phosphine (manufactured by Tokyo Chemical Industry Co., Ltd.) B-2: Tri(2,5-xylyl)phosphine (manufactured by Fujifilm Wako Pure Chemical Corporation)

[0108] <Component C> C-1: Bis(2,4-dicumylphenyl)pentaerythritol diphosphite (Manufactured by Chitec, Revonox608) C-2: Bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite (manufactured by ADEKA, PEP-36)

[0109] <Component D D-1: Epoxy group-containing compound (manufactured by NOF Corporation, Marproof G-0250SP)

[0110] <Component E E-1: Glyceryl monostearate (manufactured by Riken Vitamin, Rikemal S-100A) E-2: Pentaerythritol tetrastearate (manufactured by NOF Corporation, Unister H-476)

[0111] <Other components F-1: Triphenylphosphine (manufactured by Johoku Chemical Industry Co., Ltd., trade name JC-263) F-2: Tri(m-tolyl)phosphine (manufactured by Tokyo Chemical Industry Co., Ltd.) F-3: Tri(p-tolyl)phosphine (manufactured by Tokyo Chemical Industry Co., Ltd.) F-4: Tri(3,5-xylyl)phosphine (manufactured by Fujifilm Wako Pure Chemical Corporation) F-5: Tris(2,4-di-tert-butylphenyl)phosphite (manufactured by BASF, IRGAFOS168)

[0112] (Evaluation method) (Evaluation of light guiding performance of blue LED) The pellet-shaped polycarbonate resin composition obtained from each composition of the examples was dried in a hot air circulation dryer at 120°C for 5 hours, and using an injection molding machine (J180ADS-110U manufactured by Japan Steel Works, Ltd.), under the conditions of a molding temperature of 270°C, a mold temperature of 80°C, a molding cycle of 100 seconds, and a residence time of 220 seconds, a molded product for evaluating light guiding performance with a width of 10 mm, a thickness of 10 mm, and a length of 300 mm was molded. In addition, for the cavity and core parts of the mold used for this molding, those with a mirror finish of #5000 were used, and the evaluation was carried out using a molded product with good appearance without appearance defects such as silver, voids, sink marks, and flow marks.

[0113] In a darkroom adjusted to a room temperature of 23°C, a blue LED lamp (Opto Supply, φ5mm bullet-shaped LED, model: LP-V5YL5111A) was placed so that one end face of the molded product (a face 10 mm wide and 10 mm thick) was 3 mm away from the tip of the blue LED lamp.

[0114] An illuminance meter (Custom, digital illuminance meter, model: LX-3000) was installed so that the sensor tip was 8 mm away from the edge of the molded product (10 mm wide, 10 mm thick) on the side opposite the side where the blue LED lamp was placed.

[0115] The 100V commercial power supply was transformed using a switching AC adapter (manufactured by GO FORWARD ENTERPRISE CORP., model: GF12-US0520) with an output of DC 5V and 2.0A, and the adapter was connected to a blue LED lamp and turned on.

[0116] After adjusting the light source so that the blue LED lamp was incident on the center of the end face of the molded product, the light was adjusted so that the blue LED light was received at the center of the illuminance meter sensor located on the opposite side after the 300 mm long molded product had passed.The illuminance after the 300 mm long molded product had passed was measured and evaluated using the illuminance meter, with the assumed light source set to a white light source.

[0117] The higher the illuminance after passing through the molded product, the less light attenuates when passing through the molded product, indicating higher blue LED light-guiding performance.

[0118] <White LED light guide performance evaluation> The same molded article for evaluating light-guiding performance as that used in the evaluation of blue LED light-guiding performance described above was used, and in a darkroom adjusted to a room temperature of 23°C, a white LED lamp (manufactured by Nichia Kogyo, φ3mm bullet-shaped LED, model: NSPW310DS, with an orifice φ2.2mm attached to the tip) was placed 3mm from one end face of this molded article (a face 10mm wide and 10mm thick) to the tip of the white LED lamp.

[0119] An illuminance meter (Custom, digital illuminance meter, model: LX-3000) was installed so that the sensor tip was 8 mm away from the edge of the molded product (10 mm wide, 10 mm thick) on the side opposite the side where the white LED lamp was placed.

[0120] The 100V commercial power supply was transformed using a switching AC adapter (manufactured by GO FORWARD ENTERPRISE CORP., model: GF12-US0520) with an output of DC 5V and 2.0A, and the adapter was connected to a white LED lamp and turned on.

[0121] After adjusting the white LED lamp so that light enters the center of the end face of the molded product, the illuminance meter sensor located on the opposite side was adjusted so that the white LED light was received at the center of the 300 mm long molded product after it had passed.The illuminance after the 300 mm long molded product had passed was measured and evaluated using the illuminance meter, with the assumed light source set to a white light source.

[0122] The higher the illuminance after passing through the molded product, the less light is attenuated when passing through the molded product, indicating higher white LED light-guiding performance.

[0123] <Dry heat resistance evaluation> The pellet-shaped polycarbonate resin composition obtained from each of the compositions in the Examples was dried in a hot air circulation dryer at 120°C for 5 hours, and then molded into a molded plate measuring 50 mm in width, 90 mm in length, and 2 mm in thickness using an injection molding machine [J85-ELIII manufactured by The Japan Steel Works, Ltd.] under conditions of a cylinder temperature (molding temperature) of 270°C, a mold temperature of 80°C, a molding cycle time of 50 seconds, and a residence time of 100 seconds.

[0124] This molded plate was heat-treated for 1000 hours in a hot air circulation dryer at 130°C. The yellowness index (YI) of the molded plate before and after 1000 hours of heat treatment was measured using an integrating sphere spectrophotometer [X-Rite Ci-7800] in accordance with ASTM-D1925, using a C light source, a viewing angle of 2°, and a transmission method. The increase in YI (ΔYI) of the molded plate after heat treatment was calculated using the following formula to evaluate dry heat resistance. The larger the ΔYI, the more likely the polycarbonate resin is to yellow and the poorer its dry heat resistance. ΔYI is preferably 1.0 or less. ΔYI = YI after 1000 hours of heat treatment - YI before heat treatment

[0125] <Moisture and heat resistance evaluation> (Pressure cooker test) Molded products of the same thickness as those used in the dry heat resistance evaluation, 2 mm thick, were subjected to moist heat treatment in a steam sterilizer (Yamato Scientific Co., Ltd., SN-510) at a temperature of 120°C and a humidity of 100% RH for 24 hours. The haze of the molded plates before and after moist heat treatment was measured in accordance with ISO 14782 using a haze meter (Nippon Denshoku Industries Co., Ltd., NDH4000). The increase in haze (ΔHAZE) of the molded plates after moist heat treatment was calculated using the following formula to evaluate moist heat resistance. The larger the ΔHAZE, the more easily the polycarbonate resin deteriorates in a moist heat environment, indicating poor moist heat resistance. It is preferable that the ΔHAZE be 15 or less. ΔHAZE = HAZE after 24-hour moist heat treatment - HAZE before moist heat treatment

[0126] <Spectral light transmittance evaluation> The spectral light transmittance of the same 2 mm thick molded article used in the dry heat resistance evaluation was measured at 1 nm intervals in the wavelength range of 350 nm to 420 nm using an integrating sphere spectrophotometer (Agilent Cary 5000). A higher spectral light transmittance value indicates less light attenuation and better light-guiding performance.

[0127] [Examples 1 to 25, Comparative Examples 1 to 16] Components A, B, C, D, and other components were mixed in a blender in the amounts shown in Tables 1 to 3, and then melt-kneaded using a vented twin-screw extruder to obtain pelletized polycarbonate resin compositions. The vented twin-screw extruder used was a TEX30α (fully intermeshing, co-rotating, double-start screws) manufactured by The Japan Steel Works, Ltd. The extrusion conditions were a discharge rate of 30 kg / h, a screw rotation speed of 208 rpm, an extrusion temperature of 260°C, and a vent vacuum of 1 kPa. The resulting pellets were evaluated for blue LED light-guiding performance, white LED light-guiding performance, dry heat resistance, and moist heat resistance, as described in the evaluation methods above. The evaluation results are shown in Tables 1 to 3.

[0128] In the evaluation pass / fail judgment columns in Tables 1 to 3, blue LED light guiding performance of 75 lx (lux) or more is considered a pass, white LED light guiding performance of 750 lx (lux) or more is considered a pass, dry heat resistance of 1.0 or less is considered a pass, and moist heat resistance of 15 or less is considered a pass. As an overall judgment, if all items of blue LED light guiding performance, white LED light guiding performance, dry heat resistance, and moist heat resistance were within the pass range, they were considered a pass, and if they passed, they were marked with ``〇'', and if they failed (outside the pass range), they were marked with ``×''.

[0129] The spectral light transmittance of Example 1, Example 7, Comparative Example 2, and Comparative Examples 4 to 8 was evaluated using the evaluation method described above, and the results are shown in Figure 1. Comparative Example 2 and Comparative Examples 4 to 8 contain components A, C, and D, but Comparative Example 2 does not contain a triarylphosphine compound, Comparative Examples 4 and 5 to 7 contain a triarylphosphine compound with a different structure from the claimed component B, and Comparative Example 8 contains triaryl phosphite but does not contain the claimed component B. Examples 1 and 7 contain components A, C, and D as well as component B, which is a triarylphosphine with a specific structure, and have significantly higher transmittance in the region of 350 nm to 420 nm than Comparative Examples 2 and 4 to 8, which do not contain component B, and are therefore superior.

[0130] [Table 1]

[0131] [Table 2]

[0132] [Table 3] [Industrial Applicability]

[0133] The polycarbonate resin composition of the present invention has excellent light-guiding performance under LED light sources, as well as excellent dry heat resistance and moist heat resistance. When used to guide light from LED light sources, the polycarbonate resin composition exhibits little light attenuation and good durability (dry heat resistance and moist heat resistance). Therefore, molded articles formed from the resin composition can be used in a variety of industrial applications, such as in the fields of lighting (including LED lighting), office automation equipment, electrical and electronic equipment, automobiles, and building materials, and are extremely useful.

Claims

1. A polycarbonate resin composition comprising (A) a polycarbonate resin (component A), (B) a triarylphosphine compound represented by the following formula [1] (component B), (C) a pentaerythritol diphosphite compound (component C), and (D) an epoxy group-containing compound (component D), wherein, relative to 100 parts by weight of component A, the content of component B is 0.005 to 0.3 parts by weight, the content of component C is 0.001 to 0.08 parts by weight, and the content of component D is 0.005 to 0.3 parts by weight. 【Chemical 1】 [In the formula, R ２－１ , R ２－２ , R ２－３ , R ６－１ , R ６－２ , R ６－３ , R ０－１ , R ０－２ , R ０－３ are hydrogen atoms, hydrocarbon groups, alkoxy groups or halogens, and may be the same or different. ２－１ , R ２－２ , R ２－３ , R ６－１ , R ６－２ , R ６－３ At least one of p, q, and r is a hydrocarbon group, an alkoxy group, or a halogen atom. p, q, and r are each an integer of 0 to 3.

2. 2. The polycarbonate resin composition according to claim 1, wherein the hydrocarbon group in formula [1] is an alkyl group, an aralkyl group, an alkenyl group, or an aryl group.

3. In formula [1], R ２－１ , R ２－２ , R ２－３ , R ６－１ , R ６－２ , R ６－３ 2. The polycarbonate resin composition according to claim 1, wherein at least one of the groups is an alkyl group or an alkoxy group.

4. In formula [1], R ２－１ , R ２－２ , R ２－３ , R ６－１ , R ６－２ , R ６－３ 2. The polycarbonate resin composition according to claim 1, wherein at least one of the above is an alkyl group having 1 to 4 carbon atoms.

5. 2. The polycarbonate resin composition according to claim 1, wherein component B is at least one member selected from the group consisting of tri(o-tolyl)phosphine, tri(2,4-xylyl)phosphine, and tri(2,5-xylyl)phosphine.

6. 2. The polycarbonate resin composition according to claim 1, wherein Component C is at least one member selected from the group consisting of bis(2,4-dicumylphenyl)pentaerythritol diphosphite and bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite.

7. 2. The polycarbonate resin composition according to claim 1, wherein the content of component B is 0.01 to 0.1 part by weight per 100 parts by weight of component A.

8. 2. The polycarbonate resin composition according to claim 1, wherein the content of component C is 0.005 to 0.05 part by weight per 100 parts by weight of component A.

9. 2. The polycarbonate resin composition according to claim 1, wherein the content of component D is 0.01 to 0.1 part by weight per 100 parts by weight of component A.

10. 2. The polycarbonate resin composition according to claim 1, further comprising 0.01 to 1 part by weight of a fatty acid ester compound (E) composed of a polyhydric alcohol and a higher fatty acid (Component E) per 100 parts by weight of Component A.

11. 2. The polycarbonate resin composition according to claim 1, wherein the viscosity average molecular weight of component A is in the range of 11,500 to 50,000.

12. 2. The polycarbonate resin composition according to claim 1, wherein the dry heat resistance (Y2-Y1), which is the difference between Y1 and Y2, is 1.0 or less, when the transmitted light color (YI in ASTM D1925) of a 2 mm thick plate obtained by injection molding a powder or granule made from the resin composition according to claim 1 under conditions of a cylinder temperature of 270°C, a mold temperature of 80°C, a molding cycle time of 50 seconds, and a residence time of 100 seconds, is Y1, and the transmitted light color (YI in ASTM D1925) of the 2 mm thick plate after treating it in a hot air dryer environment at 130°C for 1,000 hours is Y2.

13. 2. The polycarbonate resin composition according to claim 1, wherein the haze value (HAZE in accordance with ISO 14782) of a 2 mm thick plate obtained by injection molding a powder or granule made from the resin composition according to claim 1 under conditions of a cylinder temperature of 270°C, a mold temperature of 80°C, a molding cycle time of 50 seconds, and a residence time of 100 seconds is H1, and the haze value (HAZE in accordance with ISO 14782) of the 2 mm thick plate after treating it in an environment of a temperature of 120°C and 100% RH for 24 hours is H2, and the moist heat resistance (H2-H1) expressed as the difference between H1 and H2 is 15 or less.

14. A molded article made from the polycarbonate resin composition according to any one of claims 1 to 13.

15. The molded article according to claim 14, which is a light-guiding part.

16. The molded product according to claim 15, which is a light guide part for a vehicle.

Images