Polycarbonate resin composition and molded article thereof

Abstract

Provided is a polycarbonate resin composition characterized by containing (B) a triaryl phosphine (component B) represented by formula [1] relative to (A) a polycarbonate resin (component A), this resin composition being characterized by little discoloration and excellent heat stability in long-term exposure to high-temperature environments. [In the formula, R2-1, R2-2, R2-3, R6-1, R6-2, R6-3, R0-1, R0-1, R0-1 are a hydrogen atom, a hydrocarbon group, an alkoxy group, or a halogen, and may be the same or different. However, at least one of R2-1, R2-2, R2-3, R6-1, R6-2, R6-3 is a hydrocarbon group, an alkoxy group, or a halogen. p, q, and r are each an integer of 0-3.]

Description

[Technical Field]

[0001] The present invention relates to a polycarbonate resin composition and a molded article thereof, and more particularly to a polycarbonate resin composition and a molded article thereof having improved thermal stability due to the addition of a triarylphosphine having a specific structure. [Background technology]

[0002] Polycarbonate resins have excellent heat resistance, mechanical properties, impact resistance, and dimensional stability, and are widely used in fields such as office automation equipment, automobiles, and electrical and electronic components. In recent years, issues such as the consumption of limited resources and environmental concerns due to carbon dioxide emissions have come to the forefront, creating a demand for longer-lasting polycarbonate resin products. However, polycarbonate resins have the problem of yellowing and losing their color when exposed to high-temperature environments for extended periods of time.

[0003] For example, Patent Document 1 discloses that a polycarbonate resin composition containing a phosphine compound in combination with a specific hindered phenol compound inhibits discoloration of the polycarbonate resin in a high-temperature environment, but it shows that the effect of the phosphine compound alone is insufficient, and there is no example of the phosphine compound of the specific structure of the present invention. Patent Document 2 discloses that a polycarbonate resin composition containing an arylphosphine compound in combination with an alicyclic epoxy compound inhibits discoloration of the polycarbonate resin in a high-temperature environment, but it shows that the effect of the phosphine compound alone is insufficient, and there is no example of the phosphine compound of the specific structure of the present invention. Patent Document 3 discloses that a polycarbonate resin composition containing a phosphine compound in combination with a metal boride inhibits discoloration of the polycarbonate resin in a high-temperature environment, but it does not show the effect of the phosphine compound alone, and there is no example of the phosphine compound of the specific structure of the present invention. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-80060 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-112963 [Patent Document 3] Japanese Patent Application Laid-Open No. 2007-169503 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a polycarbonate resin composition that is less susceptible to discoloration and has excellent thermal stability, and to provide a molded article obtained by molding the same, in response to the problem of discoloration of polycarbonate resin compositions due to long-term exposure to high-temperature environments as described above. [Means for solving the problem]

[0006] As a result of extensive research, the present inventors have found that the above problems can be solved by blending a phosphine compound having a specific structure with a polycarbonate resin, and have thus completed the present invention.

[0007] That is, according to the present invention, the following configurations (1) to (7) are provided. (1) A polycarbonate resin composition comprising (A) a polycarbonate resin (component A) and (B) a triarylphosphine (component B) represented by the following formula [1]:

[0008] [ka]

[0009] [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 0-3are 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.]

[0010] (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), 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 the above item (1), wherein at least one of the groups is an alkyl group having 1 to 4 carbon atoms. (5) The polycarbonate resin composition according to the above item (1), wherein the triarylphosphine of component B is tri(o-tolyl)phosphine, tri(2,5-xylyl)phosphine or tri(2,4-xylyl)phosphine. (6) The polycarbonate resin composition according to the above item (1), which contains 0.001 to 0.1 parts by mass of component B per 100 parts by mass of component A. (7) A molded article formed from the polycarbonate resin composition according to any one of the above items (1) to (6). [Effects of the Invention]

[0011] The polycarbonate resin composition of the present invention has little discoloration and excellent thermal stability when exposed for a long time in a high-temperature environment. Therefore, the molded product formed from the polycarbonate resin composition 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, and its industrial value is very high.

Best Mode for Carrying Out the Invention

[0012] Hereinafter, the details of the present invention will be described. <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.

[0013] The dihydroxy component used here may be any of those usually used as the dihydroxy component of polycarbonate resins, and may be bisphenols or aliphatic diols.

[0014] 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]:

[0015] [ka]

[0016] [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.

[0017] 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).

[0018] 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 above formula [6], 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, and 2,2-bis(4-hydroxyphenyl)propane, which has excellent strength and durability, and is the most suitable. These compounds may be used alone or in combination.

[0019] The polycarbonate resin used as component A of the present invention may be made into a branched polycarbonate resin by using a branching agent in combination with the above-mentioned 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.

[0020] 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.

[0021] 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.

[0022] 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].

[0023] [ka]

[0024] [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].

[0025] [ka]

[0026] [ka]

[0027] [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.]

[0028] Specific examples of the monofunctional phenols represented by the above formula [3] include phenol, isopropylphenol, p-tert-butylphenol, p-cresol, p-cumylphenol, 2-phenylphenol, 4-phenylphenol, and isooctylphenol.

[0029] Furthermore, the monofunctional phenols represented by the above 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 regulator, 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.

[0030] As the substituted phenols of the above formula [4], those in which n is 10 to 30, particularly 10 to 26, are preferred, and specific examples thereof include decylphenol, dodecylphenol, tetradecylphenol, hexadecylphenol, octadecylphenol, eicosylphenol, docosylphenol, and triacontylphenol.

[0031] Furthermore, as the substituted phenols of the above formula [5], compounds in which Y is -R-COO- and R is a single bond are 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.

[0032] Among these monofunctional phenols, the monofunctional phenols represented by the above formula [3] are preferred, more preferably alkyl-substituted or phenylalkyl-substituted phenols, and particularly preferably p-tert-butylphenol, p-cumylphenol or 2-phenylphenol.

[0033] 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.

[0034] 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.

[0035] The viscosity average molecular weight of the polycarbonate resin used as Component A of the present invention preferably ranges from 11,500 to 50,000, more preferably from 12,500 to 40,000, still more preferably from 13,500 to 35,000, and most preferably from 15,000 to 30,000. When the molecular weight exceeds the above upper limit, the melt viscosity may become too high, resulting in poor moldability. When the molecular weight is less than the above lower limit, problems may occur in mechanical strength. The viscosity average molecular weight referred to in the present invention is first determined by using an Ostwald viscometer from a solution obtained by dissolving 0.7 g of 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

[0036] 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 Cl amount in the polycarbonate resin is within the above range, it is excellent in hue and thermal stability and is preferable.

[0037] <Component B: Triarylphosphine> The triarylphosphine 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 polycarbonate resin molded product obtained by blending the triarylphosphine of this structure are suppressed from discoloring when exposed to a high-temperature environment.

[0038]

Chemical formula

[0039] [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.]

[0040] The hydrocarbon group is preferably an alkyl group, an aralkyl group, an alkenyl group or an aryl group. 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.

[0041] 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.

[0042] 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. 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.

[0043] 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. Examples of the halogen atom include a fluorine atom, a chlorine atom, and a bromine atom.

[0044] In addition, in the above 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. 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.

[0045] Specifically, examples of the triarylphosphine of the above formula [1] include tri(o-tolyl)phosphine, tri(2,5-xylyl)phosphine, and tri(2,4-xylyl)phosphine.

[0046] The content of triarylphosphine is preferably 0.001 to 0.1 parts by weight relative to 100 parts by weight of polycarbonate resin, more preferably 0.005 to 0.08 parts by weight, and even more preferably 0.01 to 0.07 parts by weight. If the content is less than the above range, the effect of inhibiting discoloration when exposed to a high-temperature environment may be reduced, while if the content exceeds the above range, triarylphosphine volatilized when heat is applied during molding or other processing may adhere to the mold, causing defects in the molded product.

[0047] <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.

[0048] (I) Other heat stabilizers The polycarbonate resin composition of the present invention may contain various known heat stabilizers, such as phosphorus-based antioxidants, sulfur-based antioxidants, and phenol-based antioxidants.

[0049] 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, phenyl)phosphite, tris(di-n-butylphenyl)phosphite, tris(2,4-di-tert-butylphenyl)phosphite, tris(2,6-di-tert-butylphenyl)phosphite, 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, phenyl bisphenol A pentaerythritol diphosphite, bis(nonylphenyl)pentaerythritol diphosphite, dicyclohexyl pentaerythritol diphosphite, etc. Furthermore, as other phosphite compounds, those which react with dihydric phenols to form a cyclic structure can also be used.For example, 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, 2,2'-ethylidenebis(4-methyl-6-tert-butylphenyl)(2-tert-butyl-4-methylphenyl)phosphite, and the like can be mentioned.

[0050] 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.

[0051] 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.

[0052] Examples of the phosphonate compound include dimethyl benzenephosphonate, diethyl benzenephosphonate, and dipropyl benzenephosphonate. 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.

[0053] 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.

[0054] 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.

[0055] The phosphorus-based antioxidants, sulfur-based antioxidants, and phenol-based antioxidants listed above can 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.

[0056] Among these, it is preferable to blend a pentaerythritol diphosphite compound, which is blended mainly for the purpose of suppressing discoloration at high temperatures when the polycarbonate resin composition of the present invention is processed into pellets using a melt kneader such as a vented twin-screw extruder, and suppressing discoloration when the polycarbonate resin composition of the present invention is processed into a desired molded product using an injection molding machine or the like. In addition, by using a triarylphosphine compound having a specific structure as component B in combination, yellowing during molding processing is suppressed, which has the effect of further improving transparency and light-guiding performance.

[0057] Specific examples of dipentaerythritol diphosphite compounds that can be used 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, and bis(2,4-dicumylphenyl)pentaerythritol diphosphite. , phenyl bisphenol A pentaerythritol diphosphite, bis(nonylphenyl)pentaerythritol diphosphite, dicyclohexylpentaerythritol diphosphite, etc., are preferred, and bis(2,4-dicumylphenyl)pentaerythritol diphosphite and bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite are more preferred, and bis(2,4-dicumylphenyl)pentaerythritol diphosphite is more preferred.

[0058] The content of the pentaerythritol diphosphite compound is preferably 0.005 to 0.1 parts by weight, and more preferably 0.01 to 0.05 parts by weight, relative to 100 parts by weight of the polycarbonate resin of component A. If the content is less than this range, the effect of inhibiting discoloration during molding and other processing may be reduced, and transparency may be impaired, whereas if the content exceeds this range, the mechanical properties, dry heat resistance, and wet heat resistance of the material may be impaired, and mold contamination may occur during molding.

[0059] (II) Mold release agent The polycarbonate resin composition of the present invention can be blended with a release agent, if necessary. Such release agents can be those known per se. Examples include saturated fatty acid esters, unsaturated fatty acid esters, polyolefin waxes (such as polyethylene wax or 1-alkene polymers, which may be modified with functional group-containing compounds, such as acid-modified waxes), silicone compounds, fluorine compounds, paraffin wax, and beeswax. Among these, saturated fatty acid esters, linear or cyclic polydimethylsiloxane oils, polymethylphenylsilicone oils, and fluorine-containing oils are preferred. Particularly preferred release agents include saturated fatty acid esters, such as monoglycerides such as stearic acid monoglyceride, polyglycerin fatty acid esters such as decaglycerin deca-stearate and decaglycerin tetrastearate, lower fatty acid esters such as stearic acid stearate, higher fatty acid esters such as sebacate behenate, and erythritol esters such as pentaerythritol tetrastearate. The amount of such a release agent is preferably 0.01 to 1 part by weight per 100 parts by weight of Component A.

[0060] (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.

[0061] 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].

[0062] 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. 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.

[0063] (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.

[0064] (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.

[0065] (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.

[0066] (VII) Epoxy compounds An epoxy compound can be blended into the polycarbonate resin composition of the present invention as needed. Such epoxy compounds are blended to improve the moist heat resistance of the polycarbonate resin composition and also inhibit mold corrosion. Essentially, any epoxy compound having an epoxy functional group can be used. Specific examples of preferred epoxy compounds include 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexylcarboxylate, 1,2-epoxy-4-(2-oxiranyl)cyclohexane adduct of 2,2-bis(hydroxymethyl)-1-butanol, copolymers of methyl methacrylate and glycidyl methacrylate, and copolymers of styrene and glycidyl methacrylate. The amount of such epoxy compound added is preferably 0.003 to 0.3 parts by weight, more preferably 0.004 to 0.2 parts by weight, even more preferably 0.005 to 0.15 parts by weight, and particularly preferably 0.01 to 0.1 parts by weight, per 100 parts by weight of Component A.

[0067] (VIII) 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] (IX) 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.

[0072] (X) Polyalkylene glycol compound 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.

[0073] (XI) 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.

[0074] <Production of Polycarbonate Resin Composition> Any method can be used to produce the polycarbonate resin composition of the present invention. For example, component A, component B, and optionally other components may be thoroughly mixed 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 pelletization using a pelletizer or other device. Other methods include feeding component A, component B, and optionally other components independently to a melt mixer such as a vented twin-screw extruder, premixing component A and a portion of the other components and then feeding the remaining components to the melt mixer independently, diluting component B with water or an organic solvent and then feeding the dilute mixture to the melt mixer, or premixing the diluted mixture with the other components and then feeding the mixture to the melt mixer. If any of the components to be blended are liquid, a liquid injection device or liquid addition device can be used to feed the components to the melt mixer.

[0075] <Molded product manufacturing> Any method can be used to produce a molded article from the polycarbonate resin composition of the present invention. For example, the polycarbonate resin composition can be kneaded in an extruder, a Banbury mixer, a roll, or the like, and then molded into a molded article by a conventionally known method such as injection molding, extrusion molding, or compression molding.

[0076] Molded articles made from the resin composition of the present invention can be suitably used in various industrial applications such as in the fields of lighting including LED lighting, office automation equipment, electrical and electronic equipment, automobiles, and building materials. [Example]

[0077] The present invention will be further explained below with reference to examples, but is not limited to these examples. Details of the components used and the evaluation methods are as follows. (Aspect 1) (Component A) A: Bisphenol A aromatic polycarbonate resin (Teijin: CM-1000, viscosity average molecular weight 15,200) (B component) B-1: Tri(o-tolyl)phosphine (Tokyo Chemical Industry Co., Ltd.) B-2: Tri(2,5-xylyl)phosphine (Fujifilm Wako Pure Chemical Industries, Ltd.) (Comparative example of component B) Z-1: Triphenylphosphine (Johoku Chemical Industry Co., Ltd., product name JC-263) Z-2: Tri(m-tolyl)phosphine (Tokyo Chemical Industry Co., Ltd.) Z-3: Tri(p-tolyl)phosphine (Tokyo Chemical Industry Co., Ltd.) Z-4: Tri(3,5-xylyl)phosphine (Fujifilm Wako Pure Chemical Industries, Ltd.) Z-5: Tris(4-methoxyphenyl)phosphine (Tokyo Chemical Industry Co., Ltd.)

[0078] (Evaluation method) <Dry heat resistance (thermal stability) evaluation> 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 [J85-ELIII manufactured by Japan Steel Works, Ltd.], a molded plate with a width of 50 mm, a length of 90 mm, and a thickness of 2 mm was molded at a molding temperature of 270°C and a mold temperature of 80°C. This molded plate was heat-treated in a hot air circulation dryer at 130°C for 500 hours and 1000 hours. The yellowness index (YI) of the molded plate before heat treatment and after heat treatment was measured and calculated by transmission method in accordance with ASTM-D1925 using an integrating sphere spectrophotometer [CE-7000A manufactured by X-Rite (YI before and after 500 hours of heat treatment), Ci7800 manufactured by X-Rite (YI before and after 1000 hours of heat treatment)] with a C light source, a viewing angle of 2°. The increase width (ΔYI) of the YI of the molded plate after heat treatment was calculated from the following formula, and the dry heat resistance was evaluated. The larger ΔYI is, the easier the polycarbonate resin discolors yellow and the worse the dry heat resistance is. ΔYI = YI after heat treatment - YI before heat treatment

[0079] [Examples A-1 to A-6 and Comparative Examples A-1 to A-6] The A component, B component, and other components were mixed in the respective blending amounts shown in Table 1 using a blender, and then melt-kneaded using a vented twin-screw extruder to obtain a pellet-shaped polycarbonate resin composition. The vented twin-screw extruder used was TEX30α manufactured by Japan Steel Works, Ltd. (fully meshing, rotating in the same direction, 2-flight screw). 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 degree of 1 kPa. Using the obtained pellets, the dry heat resistance described in the above evaluation method was evaluated. The evaluation results are shown in Table 1.

[0080]

Table 1

[0081] (Aspect 2) A-1: Bisphenol A type aromatic polycarbonate resin (Manufactured by Teijin Chemicals, Ltd., CM-1000, viscosity average molecular weight 15,000) A-2: A bisphenol A type aromatic polycarbonate resin prepared by blending 50 parts by weight of the above A-1 and 50 parts by weight of the following A-3 and adjusting to a viscosity average molecular weight equivalent to 17,000 A-3: A bisphenol A type aromatic polycarbonate resin (Manufactured by Teijin Chemicals, Ltd., L-1225WL, viscosity average molecular weight 18,500) A-4: A bisphenol A type aromatic polycarbonate resin (Manufactured by Teijin Chemicals, Ltd.: L-1225WX, viscosity average molecular weight 20,000) <Component B> B-1: Tri(o-tolyl)phosphine (manufactured by Tokyo Chemical Industry Co., Ltd.) B-2: Tri(2,5-xylenyl)phosphine (manufactured by Fujifilm Wako Pure Chemical Corporation) <Component C> C-1: Bis(2,4-dicumylphenyl)pentaerythritol diphosphite (Manufactured by Chimei, Revonox608) C-2: Bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite (manufactured by ADEKA, PEP-36) <Component E> E-1: Glyceryl monostearate (manufactured by Riken Vitamin Co., Ltd., Rikemal S-100A) E-2: Pentaerythritol tetrastearate (manufactured by NOF Corporation, Unister H-476) <Other components> Z-1: Triphenylphosphine (manufactured by Johoku Chemical Industry Co., Ltd., trade name JC-263) Z-2: Tri(m-tolyl)phosphine (manufactured by Tokyo Chemical Industry Co., Ltd.) Z-3: Tri(p-tolyl)phosphine (manufactured by Tokyo Chemical Industry Co., Ltd.) Z-4: Tri(3,5-xylenyl)phosphine (manufactured by Fujifilm Wako Pure Chemical Corporation) Z-6: Tris(2,4-di-tert-butylphenyl)phosphite (manufactured by BASF, IRGAFOS168)

[0082] (Evaluation method) <Evaluation of blue LED light guiding performance> 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 article for evaluating light guiding performance, measuring 10 mm in width, 10 mm in thickness, and 300 mm in length, using an injection molding machine (J180ADS-110U manufactured by The Japan Steel Works, Ltd.), under 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. The cavity and core parts of the mold used for this molding had a #5000 mirror finish, and the molded articles were free of appearance defects such as blemishes, voids, sink marks, and flow marks, and evaluation was performed using molded articles with good appearance.

[0083] 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.

[0084] 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. 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.

[0085] 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. 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.

[0086] <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.

[0087] 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. 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.

[0088] 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. 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.

[0089] <Dry heat resistance (thermal stability) 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 molding temperature of 270°C, a mold temperature of 80°C, a molding cycle of 50 seconds, and a residence time of 100 seconds.

[0090] 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 illuminant, a 2° viewing angle, and a transmission method. The increase in YI (ΔYI) of the molded plate after heat treatment was calculated using the following formula, and dry heat resistance was evaluated. The larger the ΔYI, the more likely the polycarbonate resin is to yellow and the poorer its dry heat resistance. △YI = YI after 1000 hours of heat treatment - YI before heat treatment

[0091] [Examples B-1 to B-14, Comparative Examples B-1 to B-5] Components A, B, C, and other components were mixed in a blender in the amounts shown in Tables 2 and 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, and dry heat resistance as described in the evaluation methods above. The evaluation results are shown in Tables 2 and 3.

[0092] In the evaluation pass / fail judgment columns in Tables 2 and 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, and dry heat resistance of 1.0 or less is considered a pass. As an overall judgment, if all items of blue LED light guiding performance, white LED light guiding performance, and dry heat resistance were within the pass range, they were considered a pass, with pass marked as ``〇'' and fail (outside the pass range) marked as ``×''.

[0093] [Table 2]

[0094] [Table 3]

[0095] (Aspect 3) <Component A> A-1: Bisphenol A type aromatic polycarbonate resin (Manufactured by Teijin Chemicals, CM-1000, viscosity average molecular weight 15,000) A-2: Bisphenol A type aromatic polycarbonate resin prepared by blending 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, L-1225WL, viscosity average molecular weight 18,500) A-4: Bisphenol A type aromatic polycarbonate resin (Manufactured by Teijin Chemicals: L-1225WX, viscosity average molecular weight 20,000) <Component B> B-1: Tri(o-tolyl)phosphine (manufactured by Tokyo Chemical Industry Co., Ltd.) B-2: Tri(2,5-xylenyl)phosphine (manufactured by Fujifilm Wako Pure Chemical Corporation) <Component C> C-1: Bis(2,4-dicumylphenyl)pentaerythritol diphosphite (Manufactured by Chimei, Revonox608) C-2: Bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite (manufactured by ADEKA, PEP-36) <Component D> D-1: Epoxy group-containing compound (manufactured by NOF Corporation, Marplex G-0250SP) <Component E> E-1: Glyceryl monostearate (manufactured by Riken Vitamin Co., Ltd., Rikemal S-100A) E-2: Pentaerythritol tetrastearate (manufactured by NOF Corporation, Unister H-476) <Other components> Z-1: Triphenylphosphine (manufactured by Johoku Chemical Industry Co., Ltd., trade name JC-263) Z-2: Tri(m-tolyl)phosphine (manufactured by Tokyo Chemical Industry Co., Ltd.) Z-3: Tri(p-tolyl)phosphine (Tokyo Chemical Industry Co., Ltd.) Z-4: Tri(3,5-xylyl)phosphine (Fujifilm Wako Pure Chemical Industries, Ltd.) Z-6: Tris(2,4-di-tert-butylphenyl)phosphite (BASF, IRGAFOS168)

[0096] (Evaluation method) <Blue LED light guide performance 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 article for evaluating light guiding performance, measuring 10 mm in width, 10 mm in thickness, and 300 mm in length, using an injection molding machine (J180ADS-110U manufactured by The Japan Steel Works, Ltd.), under 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. The cavity and core parts of the mold used for this molding had a #5000 mirror finish, and the molded articles were free of appearance defects such as blemishes, voids, sink marks, and flow marks, and evaluation was performed using molded articles with good appearance.

[0097] 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.

[0098] 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. 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.

[0099] 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. 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.

[0100] <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.

[0101] 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. 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.

[0102] 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. 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.

[0103] <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 molding temperature of 270°C, a mold temperature of 80°C, a molding cycle of 50 seconds, and a residence time of 100 seconds. 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 illuminant, a 2° viewing angle, and a transmission method. The increase in YI (ΔYI) of the molded plate after heat treatment was calculated using the following formula, and dry heat resistance was evaluated. The larger the ΔYI, the more likely the polycarbonate resin is to yellow and the poorer its dry heat resistance. △YI = YI after 1000 hours of heat treatment - YI before heat treatment

[0104] <Heat and humidity resistance evaluation> Molded products of the same thickness as those used in the dry heat resistance evaluation, 2 mm, were subjected to moist heat treatment in a steam sterilizer (Yamato Scientific, 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, 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. △HAZE = HAZE after 24-hour moist heat treatment - HAZE before moist heat treatment

[0105] [Examples C-1 to C-25, Comparative Examples C-1 to C-5] Components A, B, C, D, and other components were mixed in a blender in the amounts shown in Tables 4 to 6, 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 screw) 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 4 to 6.

[0106] In the evaluation pass / fail judgment columns in Tables 4 to 6, 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 passed items were marked with ``〇'', and failed items (outside the pass range) were marked with ``×''.

[0107] [Table 4]

[0108] [Table 5]

[0109] [Table 6] [Industrial Applicability]

[0110] The polycarbonate resin composition of the present invention exhibits excellent thermal stability with little discoloration in high-temperature environments, and molded articles obtained from the polycarbonate resin composition are extremely useful and 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.

Claims

1. A polycarbonate resin composition comprising (A) a polycarbonate resin (component A), (B) tri(o-tolyl)phosphine, tri(2,4-xylyl)phosphine or tri(2,5-xylyl)phosphine (component B), and (C) bis(2,4-dicumylphenyl)pentaerythritol diphosphite or bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite (component C), wherein the polycarbonate resin composition contains 0.001 to 0.1 parts by mass of component B and 0.005 to 0.1 parts by weight of component C per 100 parts by mass of component A.

2. A molded article formed from the polycarbonate resin composition according to claim 1.

3. A molded product according to claim 2, which is a molded product used in the lighting field.

4. A molded product as described in claim 3, wherein the lighting is LED lighting.

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