Methods for producing aromatic polycarbonate resin composition and molded article thereof, and aromatic polycarbonate resin composition and molded article produced by said production methods

Abstract

Provided is a method for producing a polycarbonate resin composition containing a recycled aromatic polycarbonate resin composition, the polycarbonate resin composition having excellent initial color tone during molding and a molded article thereof having excellent long-term heat resistance and long-term moist heat resistance, by a method for producing an aromatic polycarbonate resin composition (A) that includes a step in which an aromatic polycarbonate resin (component c), 50 mass parts or less of a recycled resin composition (component b) of an aromatic polycarbonate resin composition (component a) per 100 mass parts of component c, and specific amounts of a phosphorus antioxidant, a polyether compound, 0.01-0.5 mass parts of an alicyclic epoxy compound, and at least one selected from esters of C12-22 aliphatic carboxylic acids and glycerin per 100 total mass parts of the aromatic polycarbonate resin (component c) and the recycled resin composition (component b) are mixed, where component a includes specific amounts of phosphorus antioxidant and polyether compound relative to 100 mass parts of aromatic polycarbonate resin.

Description

Aromatic polycarbonate resin composition and method for producing molded articles thereof, and aromatic polycarbonate resin composition and molded articles produced by these methods

[0001] The present invention relates to a method for producing an aromatic polycarbonate resin composition and a molded article thereof, as well as an aromatic polycarbonate resin composition and a molded article produced by these production methods.

[0002] Polycarbonate resin (hereinafter sometimes abbreviated as PC resin) is excellent in transparency, mechanical properties, thermal stability, electrical properties, weather resistance, etc., and is therefore used in optical molded products such as light guide plates, lenses, and optical disks, taking advantage of these properties. Numerous polymer alloys of aromatic polycarbonate resins and other thermoplastic resins have also been developed and are widely used in fields such as office automation equipment, electrical and electronic equipment, automobiles, and miscellaneous goods. In particular, in recent years, resin compositions blended with aromatic polycarbonate resins and styrene-based resins, such as ABS resins, have seen a significant increase in use in components such as housings for office automation equipment and electronic and electrical devices. Compositions composed of such aromatic polycarbonate resins and styrene-based resins are widely used in various fields, including office automation equipment, due to their excellent properties such as fluidity, EMI shielding plating properties, heat resistance, and light resistance.

[0003] For example, Patent Document 1 discloses that a polycarbonate resin composition for optical components containing 0.1 to 4 parts by mass of a polyalkylene glycol (B) having a specific structure and 0.005 to 0.5 parts by mass of a phosphorus-based stabilizer (C) relative to 100 parts by mass of a polycarbonate resin (A) exhibits excellent transparency, colorfastness, and mold releasability. Patent Document 2 discloses that a resin composition containing more than 1 part by mass and not more than 7 parts by mass of a specific silicone compound (B) relative to 100 parts by mass of an aromatic polycarbonate resin (A) having a specific viscosity-average molecular weight, in which the refractive indexes of the aromatic polycarbonate resin (A) and the silicone compound (B) and the kinematic viscosity of the silicone compound (B) have a specific relationship, exhibits excellent transparency and an excellent balance of fluidity and impact resistance.

[0004] Patent No. 6416423 Patent No. 6850204

[0005] In recent years, recycling has been actively considered from the perspectives of resource reuse and environmental protection. Regarding polycarbonate resins, recycling has also been considered, such as by reusing products collected from the market in the manufacture of products (open recycling) or by reusing offcuts such as sprues and runners generated during the manufacture of products (closed recycling). However, the polycarbonate resin composition for optical components described in Patent Document 1 and the resin composition described in Patent Document 2, when containing an aromatic polycarbonate resin recycled from polycarbonate resin, have problems with initial color tone (YI) at the time of molding, long-term heat resistance, and long-term moist heat resistance. The present invention aims to provide a polycarbonate resin composition containing a recycled aromatic polycarbonate resin and / or a recycled aromatic polycarbonate resin composition, which has excellent initial color tone (YI) at the time of molding and excellent long-term heat resistance and long-term moist heat resistance, and a method for producing a molded article thereof, as well as a polycarbonate resin composition and a molded article thereof produced by the production method, which have excellent initial color tone (YI) at the time of molding and excellent long-term heat resistance and long-term moist heat resistance.

[0006] The present inventors have found that an aromatic polycarbonate resin composition produced by a production process comprising mixing a virgin aromatic polycarbonate resin with an aromatic polycarbonate resin composition recycled from an aromatic polycarbonate resin composition containing a specific amount of a phosphorus-based antioxidant and a polyether compound, and an aromatic polycarbonate resin composition produced by a production process comprising mixing a virgin aromatic polycarbonate resin composition with at least one selected from a recycled aromatic polycarbonate resin and a recycled aromatic polycarbonate resin composition, exhibit excellent initial color (YI) during molding, and the molded articles produced therefrom have excellent long-term heat resistance and long-term moist heat resistance. That is, the present invention relates to the following [1] to

[15] . [1] A method for producing a resin composition comprising: an aromatic polycarbonate resin (component c); 50 parts by mass or less of a recycled resin composition (component b) of an aromatic polycarbonate resin composition (component a) per 100 parts by mass of the aromatic polycarbonate resin (component c); and, per 100 parts by mass of the aromatic polycarbonate resin (component c) and the recycled resin composition (component b), 0.005 to 0.3 parts by mass of a phosphorus-based antioxidant, 0.05 to 1 part by mass of a polyether compound, and at least one selected from 0.01 to 0.5 parts by mass of an alicyclic epoxy compound and 0.005 to 0.5 parts by mass of an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin, A method for producing an aromatic polycarbonate resin composition (A), wherein the aromatic polycarbonate resin composition (component a) contains 0.01 to 1 part by mass of a phosphorus-based antioxidant and 0.1 to 0.6 parts by mass of a polyether compound per 100 parts by mass of the aromatic polycarbonate resin. [2] A method for producing an aromatic polycarbonate resin composition (A) according to [1], wherein the aromatic polycarbonate resin composition (component a) further contains 0.01 to 0.3 parts by mass of an alicyclic epoxy compound. [3] A method for producing an aromatic polycarbonate resin composition (A) according to [1] or [2], wherein the aromatic polycarbonate resin composition (component a) further contains 0.01 to 0.05 parts by mass of an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin.[4] A method for producing a molded article of the aromatic polycarbonate resin composition (A), comprising a step of molding the aromatic polycarbonate resin composition (A) produced by the production method according to any one of [1] to [3]. [5] The initial YI1 at the time of molding of a 5 mm thick molded article of the aromatic polycarbonate resin composition (A) in which the molding step was carried out at 280°C, and the initial YI of a molded article of the aromatic polycarbonate resin (component c) in which the aromatic polycarbonate resin (component c) was molded at 280°C. INT１ the absolute value of the difference (ΔYI1) between the initial YI and the YI2 after storing a molded article of the aromatic polycarbonate resin composition (A) at 120°C for 500 hours is less than 0.10; INT１ and the absolute value of the difference (ΔYI2) between the initial YI and the YI3 after storing a molded article of the aromatic polycarbonate resin composition (A) at 85°C and a relative humidity of 85% for 500 hours is 0.35 or less. INT１[6] The method for producing a molded article of the aromatic polycarbonate resin composition (A) according to [4], wherein the absolute value of the difference (ΔYI3) between the values ​​obtained by the method for producing the aromatic polycarbonate resin composition (A) and the values ​​obtained by the method for producing the aromatic polycarbonate resin composition (A) is 0.10 or less. [7] The method for producing a molded article of the aromatic polycarbonate resin composition (A) according to [4] or [5], [8] A method for producing an aromatic polycarbonate resin composition (B) comprising Step 1B of mixing, per 100 parts by mass of the aromatic polycarbonate resin composition (component a), an aromatic polycarbonate resin composition containing 0.01 to 1 part by mass of a phosphorus-based antioxidant and 0.1 to 0.6 part by mass of a polyether compound, in an amount of 0.01 to 0.3 part by mass of an alicyclic epoxy compound.

[10] The method for producing an aromatic polycarbonate resin composition (B) according to [8] or [9], wherein the aromatic polycarbonate resin composition (component a) further contains 0.01 to 0.05 parts by mass of an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin.

[11] A method for producing a molded article of the aromatic polycarbonate resin composition (B), comprising a step of molding the aromatic polycarbonate resin composition (B) produced by the method according to any of [8] to

[10] .

[12] The molding step is carried out at 280°C, and the initial YI at the time of molding of a 5 mm thick molded article of the aromatic polycarbonate resin composition (B) is 4, and the initial YI at the time of molding of the aromatic polycarbonate resin composition (component a) is 280°C. INT２ the absolute value of the difference (ΔYI4) between the initial YI5 and the YI6 after storing a molded article of the aromatic polycarbonate resin composition (B) at 120°C for 500 hours is less than 0.10; INT２and the absolute value of the difference (ΔYI5) between the initial YI and the YI6 after storing a molded article of the aromatic polycarbonate resin composition (B) at 85% for 500 hours is 0.35 or less. INT２

[13] The aromatic polycarbonate resin composition (B) produced by the production method according to any one of [8] to

[10] .

[14] A molded article of the aromatic polycarbonate resin composition (B) produced by the production method according to

[11] or

[12] .

[0007] The present invention can provide a method for producing a polycarbonate resin composition containing a recycled aromatic polycarbonate resin, which has excellent initial color (YI) during molding and produces molded articles with excellent long-term heat resistance and long-term moist heat resistance.

[0008] The polycarbonate resin composition of the present invention will be described in detail below. In this specification, any definition that is considered preferable can be adopted arbitrarily, and a combination of preferred values ​​can be considered more preferable. In this specification, the term "A to B" used to describe numerical values ​​means "A or more and B or less" (when A<B) or "A or less and B or more" (when A>B).

[0009] [Method for producing aromatic polycarbonate resin composition (A)] A method for producing an aromatic polycarbonate resin composition (A) according to one embodiment of the present invention includes step A of mixing an aromatic polycarbonate resin (component c), 50 parts by mass or less of a recycled resin composition (component b) of the aromatic polycarbonate resin composition (component a) relative to 100 parts by mass of component c, and further, relative to 100 parts by mass of the aromatic polycarbonate resin (component c) and the recycled resin composition (component b), 0.005 to 0.3 parts by mass of a phosphorus-based antioxidant, 0.05 to 1 part by mass of a polyether compound, 0.01 to 0.5 parts by mass of an alicyclic epoxy compound, and 0.005 to 0.5 parts by mass of an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin. Here, the component a contains 0.01 to 1 part by mass of a phosphorus-based antioxidant and 0.1 to 0.6 part by mass of a polyether compound relative to 100 parts by mass of an aromatic polycarbonate resin.

[0010] <Step A> Step A is a step of blending and mixing an aromatic polycarbonate resin (component c), a recycled resin composition (component b) of an aromatic polycarbonate resin composition (component a), a phosphorus-based antioxidant, a polyether compound, and at least one selected from an alicyclic epoxy compound and an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms with glycerin. The blended amount of component b is 50 parts by mass or less per 100 parts by mass of component c. Furthermore, per 100 parts by mass of the combined amount of components c and b, the blended amount of the phosphorus-based antioxidant is 0.005 to 0.3 parts by mass, the blended amount of the polyether compound is 0.05 to 1 part by mass, the blended amount of the alicyclic epoxy compound, if present, is 0.01 to 0.5 parts by mass, and the blended amount of the ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms with glycerin, if present, is 0.005 to 0.5 parts by mass. In step A, the components may be blended sequentially or all of the components may be blended at once. Mixing is preferably by kneading, more preferably by melt-kneading. Mixing can be performed by a known method, and blending and mixing can be performed using commonly used equipment, such as a pellet blender or a metering mixer. When melt-kneading the components, blending and melt-kneading can be performed by premixing the components using commonly used equipment, such as a Henschel mixer, ribbon blender, or drum tumbler, followed by using a single-screw extruder, twin-screw extruder, multi-screw extruder, or co-kneader. The heating temperature during melt-kneading is typically selected appropriately within the range of 240 to 300°C.

[0011] [Aromatic Polycarbonate Resin] The aromatic polycarbonate resin used in the present invention is not particularly limited, and those produced by known methods can be used. For example, those produced by reacting a dihydric phenol with a carbonate precursor by a solution method (interfacial polycondensation method) or a melting method (ester exchange method), i.e., those produced by reacting a dihydric phenol with phosgene by an interfacial polycondensation method, or those produced by reacting a dihydric phenol with diphenyl carbonate or the like by an ester exchange method, can be used as the aromatic polycarbonate resin. Both the interfacial polymerization method and the ester exchange method may be carried out in the presence of a terminal terminator. Among these, the aromatic polycarbonate resin (component c) is a virgin aromatic polycarbonate resin that has not been recycled after production. In this specification, "virgin material" refers to an unused resin or a resin composition in which the resin component is an unused resin.

[0012] Various dihydric phenols can be used, including bis(hydroxyphenyl)alkane compounds such as 2,2-bis(4-hydroxyphenyl)propane (bisphenol A), bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, and 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane; 4,4'-dihydroxydiphenyl, bis(4-hydroxyphenyl)cycloalkane, bis(4-hydroxyphenyl)oxide, bis(4-hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl)sulfoxide, and bis(4-hydroxyphenyl)ketone. Other examples include hydroquinone, resorcinol, and catechol. These compounds may be used alone or in combination of two or more. Among these, one or more bis(hydroxyphenyl)alkane compounds selected from the group consisting of 2,2-bis(4-hydroxyphenyl)propane (bisphenol A), bis(4-hydroxyphenyl)methane, and 1,1-bis(4-hydroxyphenyl)ethane are preferred, and bisphenol A is particularly preferred.

[0013] The carbonate precursor is a carbonyl halide, a carbonyl ester, or a haloformate, and specific examples thereof include phosgene, a dihaloformate of a dihydric phenol, diphenyl carbonate, dimethyl carbonate, and diethyl carbonate. The aromatic polycarbonate resin may have a branched structure. Examples of branching agents used to introduce a branched structure include 1,1,1-tris(4-hydroxyphenyl)ethane, α,α',α"-tris(4-hydroxyphenyl)-1,3,5-triisopropylbenzene, phloroglucin, trimellitic acid, and 1,3-bis(o-cresol).

[0014] In the production of the aromatic polycarbonate resin preferably used in the present invention, a terminal terminator can be used as needed. As the terminal terminator, any terminal terminator known in the art for the production of aromatic polycarbonate resins can be used, and monovalent carboxylic acids and their derivatives, and monovalent phenols can be used. Examples include p-tert-butylphenol, p-phenylphenol, p-cumylphenol, p-perfluorononylphenol, p-(perfluorononylphenyl)phenol, p-(perfluorohexylphenyl)phenol, p-tert-perfluorobutylphenol, 1-(p-hydroxybenzyl)perfluorodecane, p-[2-(1H,1H-perfluorotridodecyloxy)-1,1,1,3,3,3-hexafluoropropyl]phenol, 3,5-bis(perfluorohexyloxycarbonyl)phenol, perfluorododecyl p-hydroxybenzoate, p-(1H,1H-perfluorooctyloxy)phenol, 2H,2H,9H-perfluorononanoic acid, 1,1,1,3,3,3-hexafluoro-2-propanol, etc. These may be used alone or in combination of two or more.

[0015] The aromatic polycarbonate resin is preferably a polycarbonate resin whose main chain has a repeating unit represented by the following general formula (I).

[0016] (In the formula, R １ and R２ is an alkyl group or an alkoxy group having 1 to 6 carbon atoms, and R １ and R ２ X may be the same as or different from each other. X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, -S-, -SO-, -SO ２ represents -, -O-, or -CO-, and a and b each independently represent an integer of 0 to 4. When a is 2 or more, R １ may be the same or different, and when b is 2 or more, R ２ may be the same or different.)

[0017] R １ and R ２ Examples of alkyl groups represented by R include methyl, ethyl, n-propyl, isopropyl, various butyl groups (the term "various" refers to both linear and branched groups, and the same applies hereinafter), various pentyl groups, and various hexyl groups. １ and R ２ The alkoxy group represented by the formula (I) may be one in which the alkyl group moiety is the above-mentioned alkyl group. １ and R ２ is preferably an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.

[0018] Examples of the alkylene group represented by X include a methylene group, an ethylene group, a trimethylene group, a tetramethylene group, and a hexamethylene group, with alkylene groups having 1 to 5 carbon atoms being preferred. Examples of the alkylidene group represented by X include an ethylidene group and an isopropylidene group. Examples of the cycloalkylene group represented by X include a cyclopentanediyl group, a cyclohexanediyl group, and a cyclooctanediyl group, with cycloalkylene groups having 5 to 10 carbon atoms being preferred. Examples of the cycloalkylidene group represented by X include a cyclohexylidene group, a 3,5,5-trimethylcyclohexylidene group, and a 2-adamantylidene group, with cycloalkylidene groups having 5 to 10 carbon atoms being preferred, and cycloalkylidene groups having 5 to 8 carbon atoms being more preferred. a and b each independently represent an integer of 0 to 4, preferably 0 to 2, and more preferably 0 or 1.

[0019] The aromatic polycarbonate resin may have a branched structure. To introduce a branched structure, a branching agent may be used, and examples of such a branching agent include 1,1,1-tris(4-hydroxyphenyl)ethane; α,α',α''-tris(4-hydroxyphenyl)-1,3,5-triisopropylbenzene; 1-[α-methyl-α-(4'-hydroxyphenyl)ethyl]-4-[α',α'-bis(4''-hydroxyphenyl)ethyl]benzene; phloroglucin, trimellitic acid, and isatin bis(o-cresol), and other compounds having three or more functional groups.

[0020] From the viewpoints of the transparency, mechanical properties, thermal properties, etc. of the resulting molded article, the aromatic polycarbonate resin preferably contains a polycarbonate resin having a bisphenol A structure. Specific examples of polycarbonate resins having a bisphenol A structure include those represented by the general formula (I) in which X is an isopropylidene group.

[0021] In the present invention, the viscosity average molecular weight (Mv) of the aromatic polycarbonate resin (component c) is preferably 9,000 to 40,000, more preferably 9,000 to 30,000, and even more preferably 11,000 to 25,000, from the viewpoint of fluidity. In particular, when the polycarbonate resin composition of the present invention is used for light-guiding components, the Mv of the aromatic polycarbonate resin (A) is preferably 13,000 to 23,000, and more preferably 14,000 to 22,000. In this specification, the viscosity average molecular weight (Mv) is calculated by measuring the viscosity of a methylene chloride solution (concentration unit: g / L) at 20°C using an Ubbelohde viscometer, determining the intrinsic viscosity [η] from this, and then calculating it using the following formula: [η] = 1.23 × 10 －５ Mv ０．８３

[0022] [Aromatic Polycarbonate Resin Composition (Component a)] The aromatic polycarbonate resin composition (component a) is an aromatic polycarbonate resin composition as a so-called virgin material, containing the above-mentioned aromatic polycarbonate resin, a phosphorus-based antioxidant described below, and a polyether compound described below. The aromatic polycarbonate resin contained in the aromatic polycarbonate resin composition (component a) may be the same as or different from the aromatic polycarbonate resin (component c) contained in the aromatic polycarbonate resin composition (A) together with the recycled resin composition (component b) of the aromatic polycarbonate resin composition (component a).

[0023] The content of the aromatic polycarbonate resin in the aromatic polycarbonate resin composition (component a) is preferably 95 to 99.5 mass%, more preferably 98 to 99.5 mass%, and even more preferably 98.5 to 99.5 mass%, from the viewpoint of obtaining an aromatic polycarbonate resin composition that is excellent in initial color tone (YI) during molding and that provides a molded article with excellent long-term heat resistance and long-term moist heat resistance.

[0024] [Phosphorus-based antioxidant] When the aromatic polycarbonate resin composition (component a) contains a phosphorus-based antioxidant, oxidation degradation can be prevented even when the polycarbonate resin composition is molded under high temperature conditions, and molded articles with little yellowing and excellent light transmittance can be obtained. As the phosphorus-based antioxidant, a phosphorus-based antioxidant having an aryl group is preferred. Examples of phosphorus-based antioxidants having an aryl group include 3,4:5,6-dibenzo-1,2-oxaphosphine, triphenylphosphine, diphenylbutylphosphine, diphenyloctadecylphosphine, tris-(p-tolyl)phosphine, tris-(p-nonylphenyl)phosphine, tris-(naphthyl)phosphine, diphenyl-(hydroxymethyl)-phosphine, diphenyl-(acetoxymethyl)-phosphine, diphenyl-(β-ethylcarboxyethyl)-phosphine, tris-(p-chlorophenyl)phosphine, tris-(p-fluorophenyl)phosphine, diphenylbenzylphosphine, diphenyl-β-cyanoethylphosphine, diphenyl-(p-hydroxyphenyl)-phosphine, diphenyl-1,4-dihydroxyphenyl-2-phosphine, and phenylnaphthylbenzylphosphine.

[0025] Furthermore, as the phosphorus-based antioxidant, a phosphorus-based antioxidant having an aryl group and a phosphite structure is preferred, and a phosphorus-based antioxidant having an aryl group and a pentaerythritol phosphite structure is more preferred, because it is less susceptible to thermal decomposition even when molded under high-temperature conditions and can suppress oxidative deterioration of the polycarbonate resin molding material.

[0026] Examples of phosphorus-based antioxidants having an aryl group and a phosphite structure include triphenyl phosphite, diphenyl nonyl phosphite, diphenyl(2-ethylhexyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, trisnonylphenyl phosphite, diphenyl isooctyl phosphite, 2,2'-methylenebis(4,6-di-tert-butylphenyl)octyl phosphite, diphenyl isodecyl phosphite, diphenyl mono(tridecyl) phosphite, phenyl diisodecyl phosphite, phenyl di(tridecyl) phosphite, tris(2-ethylhexyl) phosphite, tris(isodecyl) phosphite, and tris(tridecyl) phosphite. phosphate, dibutyl hydrogen phosphite, trilauryl trithiophosphite, tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylene diphosphonite, 4,4'-isopropylidenediphenol dodecyl phosphite, 4,4'-isopropylidenediphenol tridecyl phosphite, 4,4'-isopropylidenediphenol tetradecyl phosphite, 4,4'-isopropylidenediphenol pentadecyl phosphite, 4,4'-butylidenebis(3-methyl-6-tert-butylphenyl)ditridecyl phosphite, 1,1,3-tris(2-methyl-4-tridecylphosphite-5-tert-butylphenyl)butane, and the like.

[0027] Examples of the phosphorus-based antioxidant having an aryl group and a pentaerythritol phosphite structure include compounds represented by the following general formula (II).

[0028]

[0029] In the formula, R １１ ~R １４ each independently represents a hydrocarbon group having 6 or more carbon atoms, and is preferably each independently a substituted or unsubstituted cumyl group, phenyl group, naphthyl group or biphenyl group.

[0030] Specific examples of the compound represented by general formula (II) include bis(2,6-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,4-dicumylphenyl)pentaerythritol diphosphite, etc. Bis(2,4-dicumylphenyl)pentaerythritol diphosphite is available as a commercially available product, and for example, "Doverphos (registered trademark) S-9228PC" manufactured by Dover Chemical Company and "Irgafos 168" manufactured by BASF can be used.

[0031] The content of the phosphorus-based antioxidant relative to 100 parts by mass of the aromatic polycarbonate resin in the aromatic polycarbonate resin composition (component a) is 0.01 to 1 part by mass, preferably 0.03 to 0.5 parts by mass, and more preferably 0.04 to 0.1 part by mass, from the viewpoint of obtaining an aromatic polycarbonate resin composition that is excellent in initial color tone (YI) during molding and that provides a molded article with excellent long-term heat resistance and long-term moist heat resistance.

[0032] [Polyether Compound] When the aromatic polycarbonate resin composition (component a) contains a polyether compound, it is possible to obtain a molded article of the aromatic polycarbonate resin composition which has a more excellent initial color tone (YI) during molding and which has more excellent long-term heat resistance and long-term moist heat resistance. ２１ O) ｍ１ and a polyoxyalkylene structure represented by (R ２２ O) ｍ２ It is preferable that R has a polyoxyalkylene structure represented by the following formula: ２１ and R ２２ each independently represents an alkylene group having 1 or more carbon atoms. m1+m2 is 5 or more and less than 300, preferably 10 to 200, and more preferably 20 to 100.

[0033] R ２１ and R ２２ Examples of the alkylene group represented by the formula (I) include a methylene group, an ethylene group, a trimethylene group, a propylene group, a tetramethylene group, and a hexamethylene group, and an alkylene group having 1 to 5 carbon atoms is preferred. ２１ In the O group, multiple R２１ may be the same alkylene group or may be alkylene groups with different carbon numbers. ２１ O) ｍ１ The polyoxyalkylene group represented by the formula (I) is not limited to those having a single oxyalkylene unit as a repeating unit, such as a polyoxyethylene group or a polyoxypropylene group, but may also have a plurality of oxyalkylene units with different carbon numbers, such as an oxyethylene unit and an oxypropylene unit, as repeating units. ２２ MoR ２１ and m R ２２ In the O group, multiple R ２２ may be the same alkylene group or may be alkylene groups with different carbon numbers.

[0034] The polyether compound is preferably at least one selected from the group consisting of compounds represented by the following general formula (III), alkylene oxide adducts of polyhydric alcohols and esters thereof, and cyclic polyether compounds. ２３ O-(R ２１ O) ｍ１ -A-(R ２２ O) ｍ２ -R ２４ (III) (wherein, R ２１ and R ２２ each independently represents an alkylene group having 1 or more carbon atoms. m1+m2 is 5 or more and less than 300. R ２３ and R ２４ each independently represents a hydrogen atom, a hydrocarbon group having 1 to 30 carbon atoms, an alkanoyl group having 1 to 30 carbon atoms, an alkenoyl group having 2 to 30 carbon atoms, or a glycidyl group. A represents a single bond or a divalent organic group.

[0035] R ２１ and R ２２ The alkylene group represented by (R ２１ O) ｍ１ and a polyoxyalkylene structure represented by (R ２２ O) ｍ２ The polyoxyalkylene structure represented by the following formula is also as described above.

[0036] R ２３ and R ２４ Examples of hydrocarbon groups having 1 to 30 carbon atoms represented by the formula (I) include alkyl groups having 1 to 30 carbon atoms, alkenyl groups having 2 to 30 carbon atoms, aryl groups having 6 to 30 carbon atoms, and aralkyl groups having 7 to 30 carbon atoms. The alkyl and alkenyl groups may be linear, branched, or cyclic, and examples include methyl, ethyl, n-propyl, isopropyl, various butyl groups, various pentyl groups, various hexyl groups, various octyl groups, cyclopentyl, cyclohexyl, allyl, propenyl, various butenyl groups, various hexenyl groups, various octenyl groups, cyclopentenyl, and cyclohexenyl groups. Examples of aryl groups include phenyl, tolyl, and xylyl groups. Examples of aralkyl groups include benzyl, phenethyl, and methylbenzyl groups.

[0037] R ２３ and R ２４ The alkanoyl group having 1 to 30 carbon atoms, represented by the formula (I), may be linear or branched, and examples thereof include methanoyl, ethanoyl, n-propanoyl, isopropanoyl, n-butanoyl, t-butanoyl, n-hexanoyl, n-octanoyl, n-decanoyl, n-dodecanoyl, and benzoyl groups. Among these, alkanoyl groups having 1 to 20 carbon atoms are preferred from the viewpoints of compatibility, thermal stability, and ease of production. R ２３ and R ２４ The alkenoyl group having 2 to 30 carbon atoms, represented by the formula (I), may be linear or branched, and examples thereof include an ethenoyl group, an n-propenoyl group, an isopropenoyl group, an n-butenoyl group, a t-butenoyl group, an n-hexenoyl group, an n-octenoyl group, an n-decenoyl group, an n-dodecenoyl group, etc. Among these, from the viewpoints of achieving a low molecular weight, compatibility and solubility, and ease of production, an alkenoyl group having 2 to 10 carbon atoms is preferred, and an alkenoyl group having 2 to 6 carbon atoms is more preferred.

[0038] Examples of the divalent organic group represented by A include groups represented by the following formula (a):

[0039]

[0040] Specific examples of the compound represented by general formula (III) include polyethylene glycol, polytrimethylene glycol, polypropylene glycol, polytetramethylene glycol, polyoxytetramethylene polyoxyethylene glycol, polyoxyethylene monomethyl ether, polyoxyethylene dimethyl ether, polyoxyethylene-bisphenol A ether, polyoxypropylene-bisphenol A ether, polyoxyethylene-polyoxypropylene-bisphenol A ether, polyethylene glycol allyl ether, polyethylene glycol diallyl ether, polypropylene glycol allyl ether, polypropylene glycol diallyl ether, polyethylene glycol-polypropylene glycol allyl ether, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, polypropylene glycol distearate, etc. These are commercially available products, and examples thereof include "UNIOX (registered trademark)," "UNIOL (registered trademark)," "UNILUBE (registered trademark)," "UNISAFE (registered trademark)," "POLYCERYL (registered trademark)," and "EPIOL (registered trademark)" manufactured by NOF Corporation, "PTMG" manufactured by Mitsubishi Chemical Corporation, and "Velvetol" manufactured by Allessa GmbH.

[0041] Examples of the polyhydric alcohol in the alkylene oxide adduct of a polyhydric alcohol and its ester include glycerin, diglyceryl ether, sorbitol, etc. Specific examples of the cyclic polyether compound include 18-crown 6, dibenzo-18-crown 6, etc.

[0042] The number average molecular weight of the polyether compound is not particularly limited, but is preferably 200 to 10,000, more preferably 500 to 8,000, and even more preferably 1,000 to 5,000.

[0043] The content of the polyether compound relative to 100 parts by mass of the aromatic polycarbonate resin in the aromatic polycarbonate resin composition (component a) is 0.1 to 0.6 parts by mass, preferably 0.2 to 0.55 parts by mass, and more preferably 0.3 to 0.5 parts by mass, relative to 100 parts by mass of the aromatic polycarbonate resin, from the viewpoint of obtaining an aromatic polycarbonate resin composition that is excellent in initial color tone (YI) during molding and that provides a molded article with excellent long-term heat resistance and long-term moist heat resistance.

[0044] [Stabilizer] When the aromatic polycarbonate resin composition (component a) contains a stabilizer, a molded article of the aromatic polycarbonate resin composition is less likely to yellow under high-temperature and high-humidity conditions and high-temperature conditions, and can maintain a good color tone. As the stabilizer, an epoxy compound is preferred, a cyclic epoxy compound is more preferred, and an alicyclic epoxy compound is even more preferred.

[0045] (Alicyclic Epoxy Compound) The alicyclic epoxy compound refers to a cyclic aliphatic compound having an alicyclic epoxy group, i.e., an epoxy group in which one oxygen atom is added to an ethylene bond in an aliphatic ring. Specifically, compounds represented by the following formulas (IV-1) to (IV-10) are preferably used.

[0046] In formula (IV-2) and formula (IV-3), R ３１ ~R ３３ are each a hydrogen atom or a methyl group. In formula (IV-5), a1 and b1 are integers that satisfy a1 + b1 = 1 or 2. In formula (IV-6), n1 is an integer. In formula (IV-7), R ３４ and R ３５ are hydrocarbon groups which may be the same. In formula (IV-8), c1, d1, e1, and f1 are integers which satisfy the relationship c1+d1+e1+f1=1 to 3. In formula (IV-9), g1, h1, and i1 are integers which may be the same, and R ３６ In formula (IV-10), n2 is an integer, and R ３７ is a hydrocarbon group.

[0047] Among the above-mentioned alicyclic epoxy compounds, one or more selected from the group consisting of compounds represented by formula (IV-1), formula (IV-9), and formula (IV-10) are preferred, as they have excellent compatibility with aromatic polycarbonate resins (component c) and do not impair the transparency of molded articles. One or more selected from the group consisting of compounds represented by formula (IV-1) and formula (IV-10) are more preferred, and the compound represented by formula (IV-1) is even more preferred. For example, the compound represented by formula (IV-1) is available as 3',4'-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (manufactured by Daicel Corporation under the trade name "Celloxide 2021P"). Furthermore, the compound represented by formula (IV-10) is available as 2,2-bis(hydroxymethyl)-1-butanol to 1,2-epoxy-4-(2-oxiranyl)cyclohexane adduct (manufactured by Daicel Corporation under the trade name "EHPE3150"). Furthermore, "EHPE3150CE" commercially available from Daicel Corporation as a mixture of Celloxide 2021P and EHPE3150 can also be preferably used.

[0048] When the aromatic polycarbonate resin composition (component a) contains an alicyclic epoxy compound, the content of the alicyclic epoxy compound relative to 100 parts by mass of the aromatic polycarbonate resin in the aromatic polycarbonate resin composition (component a) is preferably 0.01 to 0.3 parts by mass, more preferably 0.015 to 0.2 parts by mass, and even more preferably 0.02 to 0.1 parts by mass, from the viewpoint of obtaining an aromatic polycarbonate resin composition that is excellent in initial color tone (YI) during molding and that provides a molded article with excellent long-term heat resistance and long-term moist heat resistance.

[0049] [Mold Release Agent] The aromatic polycarbonate resin composition (component a) preferably contains a mold release agent from the viewpoint of improving mold releasability when molding the aromatic polycarbonate resin composition.

[0050] Examples of the release agent include fatty acid esters, polyolefin waxes, fluorine oils, and paraffin waxes, with fatty acid esters being preferred, and esters of aliphatic carboxylic acids having 12 to 22 carbon atoms and glycerin being more preferred.

[0051] (Esters of C12-22 aliphatic carboxylic acids and glycerin) Esters of C12-22 aliphatic carboxylic acids and glycerin can be obtained by esterifying C12-22 aliphatic carboxylic acids with glycerin to form monoesters, diesters, or triesters. Examples of C12-22 aliphatic carboxylic acids include saturated aliphatic carboxylic acids such as dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid (palmitic acid), heptadecanoic acid, octadecanoic acid (stearic acid), and nonadecanoic acid, as well as unsaturated aliphatic carboxylic acids such as oleic acid, linoleic acid, and linolenic acid. Among these, those having 14 to 20 carbon atoms are preferred, with stearic acid and palmitic acid being particularly preferred.

[0052] Aliphatic carboxylic acids such as stearic acid are often produced from natural fats and oils and are often in the form of a mixture containing other carboxylic acid components with different numbers of carbon atoms. Among the fatty acid esters, ester compounds obtained from stearic acid or palmitic acid, which are produced from natural fats and oils and are in the form of a mixture containing other carboxylic acid components, are preferably used. Specific examples of esters of aliphatic carboxylic acids having 12 to 22 carbon atoms and glycerin include those primarily composed of glycerin monostearate, glycerin distearate, glycerin tristearate, glycerin monopalmitate, glycerin monobehenate, etc. Of these, those primarily composed of glycerin monostearate or glycerin monopalmitate are preferred. More preferably, those with a monoglyceride ratio of 95% or more are used. The ester of aliphatic carboxylic acids having 12 to 22 carbon atoms and glycerin is preferably an ester of stearic acid and glycerin, with glycerin monostearate being more preferred.

[0053] When the aromatic polycarbonate resin composition (component a) contains an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin, the content of the ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin relative to 100 parts by mass of the aromatic polycarbonate resin in the aromatic polycarbonate resin composition (component a) is preferably 0.01 to 0.05 parts by mass, more preferably 0.015 to 0.045 parts by mass, and even more preferably 0.02 to 0.04 parts by mass, from the viewpoint of obtaining an aromatic polycarbonate resin composition that is excellent in initial color tone (YI) during molding and that provides a molded article with excellent long-term heat resistance and long-term moist heat resistance, and from the viewpoint of improving mold releasability during molding.

[0054] [Other Additives] The aromatic polycarbonate resin composition (component a) may contain other components as appropriate to the extent that the effects of the present invention are not significantly impaired. Examples of other components include additives such as antioxidants other than the above-mentioned phosphorus-based inhibitors.

[0055] (Antioxidants other than phosphorus-based antioxidants) As antioxidants other than phosphorus-based antioxidants, phenol-based antioxidants can be used.

[0056] The phenolic antioxidant is not particularly limited, but hindered phenols are preferably used. Representative examples include octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, triethylene glycol-bis[3-(3-tert-butyl-5-methyl-4-hydroxyphenyl)propionate], 1,6-hexanediol-bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], pentaerythrityl-tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], N,N'-hexamethylenebis[(3,5-di-tert-butyl tert-butyl-4-hydroxy)-hydrocinnamide], 2,2-thio-diethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,4-bis(n-octylthio)-6-(4-hydroxy-3,5-di-tert-butylanilino)-1,3,5-triazine, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, and tris-(3,5-di-tert-butyl-4-hydroxybenzyl)-isocyanurate.

[0057] [Recycled Resin Composition (Component b)] The recycled resin composition (Component b) refers to, for example, a molded product of Component a, a pulverized product of sprue or runner generated during molding of Component a, or pellets produced by heating the pulverized product and extruding it in an extruder. That is, Component b is an aromatic polycarbonate resin composition having a longer thermal history than Component a.

[0058] Typically, a molded article made from a degraded recycled aromatic polycarbonate resin composition has the disadvantage of being inferior in color tone compared to a molded article made from an undegraded, normal polycarbonate resin. Even if an undegraded, normal polycarbonate resin is added to compensate for the color tone lost by using a recycled aromatic polycarbonate resin composition, the degree of color tone recovery is small. In contrast, in a method for producing an aromatic polycarbonate resin composition (A) according to one embodiment of the present invention, the aromatic polycarbonate resin composition (component a) contains 0.01 to 1 part by mass of a phosphorus-based antioxidant and 0.1 to 0.6 parts by mass of a polyether compound per 100 parts by mass of the aromatic polycarbonate resin. This suppresses color tone changes in the recycled resin composition (component b) obtained by recycling component a, and is believed to provide a method for producing a polycarbonate resin composition (A) that has excellent initial color tone (YI) during molding and produces molded articles with excellent long-term heat resistance and long-term moist heat resistance.

[0059] The aromatic polycarbonate resin in the recycled resin composition (component b) may have a hydroxyl group terminal fraction of 10 mol% or less as a measure of its degree of degradation. Here, "hydroxyl group terminal fraction" refers to the ratio of hydroxyl groups (OH groups) at the aromatic polycarbonate resin terminals. For example, as described above, when the aromatic polycarbonate resin in the recycled aromatic polycarbonate resin composition (component b) has a structure derived from a terminal terminator, the mol% of the structure derived from the terminal terminator and the mol% of OH groups at the polycarbonate resin terminals total 100 mol%. The hydroxyl group terminal fraction can be determined, for example, by nuclear magnetic resonance (NMR). The aromatic polycarbonate resin contained in the recycled resin composition (component b) may be the same aromatic polycarbonate resin as the aromatic polycarbonate resin (component c) shown above, except for the higher hydroxyl group terminal fraction. The aromatic polycarbonate resin contained in the recycled resin composition (component b) preferably has a terminal hydroxyl group fraction of 2 mol % or more and 5 mol % or less.

[0060] The content of the aromatic polycarbonate resin in the recycled resin composition (component b) is preferably 95 to 99.5 mass%, more preferably 98 to 99.5 mass%, and even more preferably 98.5 to 99.5 mass%, from the viewpoint of obtaining an aromatic polycarbonate resin composition that is excellent in initial color tone (YI) during molding and that provides a molded article with excellent long-term heat resistance and long-term moist heat resistance.

[0061] In step A, the amount of recycled resin composition (component b) blended per 100 parts by mass of aromatic polycarbonate resin (component c) is 50 parts by mass or less, preferably 46 parts by mass or less, and more preferably 43 parts by mass or less, from the viewpoint of obtaining an aromatic polycarbonate resin composition (A) that is excellent in initial color tone (YI) during molding and that provides a molded article with excellent long-term heat resistance and long-term moist heat resistance. There is no particular lower limit for the amount of recycled resin composition (component b), but from the viewpoints of resource reuse and environmental protection, it is preferably 5 parts by mass or more, more preferably 8 parts by mass or more, and even more preferably 10 parts by mass or more, per 100 parts by mass of aromatic polycarbonate resin (component c).

[0062] Examples of the phosphorus-based antioxidant and polyether compound used in step A include the phosphorus-based antioxidant and polyether compound contained in the aromatic polycarbonate resin composition (component a). The phosphorus-based antioxidant and polyether compound added in step A may be the same compound as or different from the phosphorus-based antioxidant and polyether compound contained in the aromatic polycarbonate resin composition (component a).

[0063] The amount of the phosphorus-based antioxidant blended in step A is 0.005 to 0.3 parts by mass, preferably 0.007 to 0.26 parts by mass, and more preferably 0.009 to 0.22 parts by mass, per 100 parts by mass of the total amount of the aromatic polycarbonate resin (component c) and the recycled resin composition (component b).

[0064] The amount of the polyether compound in step A is 0.05 to 1 part by mass, preferably 0.07 to 0.8 parts by mass, and more preferably 0.09 to 0.6 parts by mass, per 100 parts by mass of the total amount of the aromatic polycarbonate resin (component c) and the recycled resin composition (component b).

[0065] Furthermore, in step A, at least one selected from an alicyclic epoxy compound and an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin is further added. Here, in step A, only one or more alicyclic epoxy compounds may be added, only one or more esters of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin may be added, or a combination of one or more alicyclic epoxy compounds and one or more esters of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin may be added. Examples of the alicyclic epoxy compound and the ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin used in step A include the alicyclic epoxy compound and the ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin contained in the aromatic polycarbonate resin composition (component a). The alicyclic epoxy compound and the ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms with glycerin that may be added in step A may be the same compound as or different from the alicyclic epoxy compound and the ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms with glycerin contained in the aromatic polycarbonate resin composition (component a). The addition of the alicyclic epoxy compound and the ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms with glycerin may be carried out simultaneously with the addition of the phosphorus-based antioxidant and the polyether compound, or may be carried out before or after the addition of the phosphorus-based antioxidant and the polyether compound, and is preferably carried out simultaneously.

[0066] When the alicyclic epoxy compound is added in step A, the blending amount is preferably 0.01 to 0.5 parts by mass, more preferably 0.03 to 0.4 parts by mass, and even more preferably 0.04 to 0.35 parts by mass, relative to 100 parts by mass of the total amount of the aromatic polycarbonate resin (component c) and the recycled resin composition (component b).

[0067] When the ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin is added in step A, the blending amount is preferably 0.005 to 0.5 parts by mass, more preferably 0.008 to 0.8 parts by mass, and even more preferably 0.01 to 0.1 parts by mass, per 100 parts by mass of the total amount of the aromatic polycarbonate resin (component c) and the recycled resin composition (component b).

[0068] [Aromatic Polycarbonate Resin Composition (A)] The aromatic polycarbonate resin composition (A) according to one embodiment of the present invention is an aromatic polycarbonate resin composition (A) produced by the above-described production method.

[0069] The content of the aromatic polycarbonate resin in the aromatic polycarbonate resin composition (A) is preferably 97 to 99.8 mass%, more preferably 98 to 99.8 mass%, and even more preferably 98.5 to 99.8 mass%, from the viewpoint of obtaining an aromatic polycarbonate resin composition that is excellent in initial color tone (YI) during molding and that provides a molded article with excellent long-term heat resistance and long-term moist heat resistance.

[0070] The respective contents of the phosphorus-based antioxidant, polyether compound, alicyclic epoxy compound, and polyether compound in the aromatic polycarbonate resin composition (A) are difficult to specify because the respective contents of the phosphorus-based antioxidant, polyether compound, alicyclic epoxy compound, and polyether compound in the recycled aromatic polycarbonate resin composition (component b) are not constant depending on the source of component b. However, since component b is an aromatic polycarbonate resin composition obtained by recycling component a, the respective contents of the phosphorus-based antioxidant, polyether compound, alicyclic epoxy compound, and polyether compound in the aromatic polycarbonate resin composition (A) generally fall within the following ranges.

[0071] The content of the phosphorus-based antioxidant in the aromatic polycarbonate resin composition (A) is preferably 0.015 to 1.3 mass%, more preferably 0.017 to 0.75 mass%, and even more preferably 0.018 to 0.3 mass%, from the viewpoints of achieving excellent initial color tone (YI) during molding of the aromatic polycarbonate resin composition (A) and excellent long-term heat resistance and long-term moist heat resistance of a molded article of the aromatic polycarbonate resin composition (A).

[0072] The content of the polyether compound in the aromatic polycarbonate resin composition (A) is preferably 0.15 to 1.25% by mass, more preferably 0.16 to 1% by mass, and even more preferably 0.17 to 0.6% by mass, from the viewpoints of achieving excellent initial color tone (YI) during molding of the aromatic polycarbonate resin composition (A) and excellent long-term heat resistance and long-term moist heat resistance of a molded article of the aromatic polycarbonate resin composition (A).

[0073] The content of the alicyclic epoxy compound in the aromatic polycarbonate resin composition (A) is preferably 0.005 to 0.8 mass%, more preferably 0.007 to 0.6 mass%, and even more preferably 0.009 to 0.4 mass%, from the viewpoints of providing an excellent initial color tone (YI) during molding of the aromatic polycarbonate resin composition (A) and providing an article molded from the aromatic polycarbonate resin composition (A) with excellent long-term heat resistance and long-term moist heat resistance.

[0074] The content of the ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin in the aromatic polycarbonate resin composition (A) is preferably 0.001 to 0.55 mass%, more preferably 0.003 to 0.145 mass%, and even more preferably 0.005 to 0.09 mass%, from the viewpoints of providing an excellent initial color tone (YI) during molding of the aromatic polycarbonate resin composition (A) and providing an article molded from the aromatic polycarbonate resin composition (A) with excellent long-term heat resistance and long-term moist heat resistance.

[0075] [Method for producing a molded article from aromatic polycarbonate resin composition (A)] A method for producing a molded article from aromatic polycarbonate resin composition (A) according to one embodiment of the present invention includes a step of molding the aromatic polycarbonate resin composition (A) produced by the above-mentioned production method. When producing pellets as a molded article from the aromatic polycarbonate resin composition (A), the molding step may, for example, be a step of molding the aromatic polycarbonate resin composition (A) by a granulation method using a strand method or a hot cut method. Alternatively, the molding step may be a step of molding a molded article using the obtained aromatic polycarbonate resin composition (A) or its pellets by injection molding, injection compression molding, extrusion molding, blow molding, press molding, or the like.

[0076] The initial YI1 at the time of molding of a 5 mm thick molded product of the aromatic polycarbonate resin composition (A) in which the molding step was carried out at 280°C, and the initial YI1 of a molded product of the aromatic polycarbonate resin (component c) in which the molding step was carried out at 280°C INT１ The absolute value of the difference (ΔYI1) between the initial YI and the YI2 after storing a molded article of the aromatic polycarbonate resin composition (A) at 120°C for 500 hours is preferably less than 0.10, more preferably 0.08 or less, and even more preferably 0.06 or less. INT１ The absolute value of the difference (ΔYI2) between the initial YI and the YI after storing a molded article of the aromatic polycarbonate resin composition (A) at 85°C and a relative humidity of 85% for 500 hours is preferably 0.35 or less, more preferably 0.33 or less, and even more preferably 0.30 or less. INT１ The absolute value of the difference (ΔYI3) between the values ​​of ΔYI1 and ΔYI3 is preferably 0.15 or less, more preferably 0.12 or less, and even more preferably 0.10 or less. An aromatic polycarbonate resin composition (A) having ΔYI1 to ΔYI3 satisfying the above ranges is excellent in initial color tone (YI) during molding, and the molded article has excellent long-term heat resistance and long-term moist heat resistance.

[0077] [Molded Article of Aromatic Polycarbonate Resin Composition (A)] The molded article of the aromatic polycarbonate resin composition (A) according to one embodiment of the present invention is a molded article of the aromatic polycarbonate resin composition (A) produced by the above-described production method.

[0078] [Method for Producing Aromatic Polycarbonate Resin Composition (B)] A method for producing an aromatic polycarbonate resin composition (B) according to one embodiment of the present invention includes step 1B of mixing an aromatic polycarbonate resin composition (component a) with 50 parts by mass or less of at least one selected from recycled aromatic polycarbonate resins and recycled resin compositions of aromatic polycarbonate resin compositions (component d) per 100 parts by mass of the aromatic polycarbonate resin composition (component a). The component a contains 0.01 to 1 part by mass of a phosphorus-based antioxidant and 0.1 to 0.6 parts by mass of a polyether compound per 100 parts by mass of the aromatic polycarbonate resin.

[0079] <Step 1B> Step 1B is a step of blending an aromatic polycarbonate resin composition (component a) with 50 parts by mass or less of at least one selected from a recycled aromatic polycarbonate resin and a recycled resin composition of an aromatic polycarbonate resin composition (component d) per 100 parts by mass of component a, and mixing component a and component d. Mixing may be by kneading. Mixing can be performed using the equipment listed in step A above, and the temperature during mixing is selected appropriately.

[0080] The aromatic polycarbonate resin composition (component a) can be any of those shown above, and the preferred ranges are also the same. The phosphorus-based antioxidant and polyether compound contained in component a can be any of those shown above. When component a contains 0.01 to 1 part by mass of a phosphorus-based antioxidant and 0.1 to 0.6 part by mass of a polyether compound per 100 parts by mass of aromatic polycarbonate resin, it is possible to suppress change in color tone during molding of polycarbonate resin composition (B) obtained by a production method including a step of mixing component a with a specific amount of recycled aromatic polycarbonate resin and a recycled resin composition (component d) of an aromatic polycarbonate resin composition, and it is believed that a method for producing polycarbonate resin composition (B) can be provided that has an excellent initial color tone (YI) during molding and produces molded articles with excellent long-term heat resistance and long-term moist heat resistance.

[0081] As the phosphorus-based antioxidant, alicyclic epoxy compound, and other additives that may be contained in component a, those shown above can be used, and the preferred ranges are also the same.

[0082] [Recycled Resin Composition (Component d) of Recycled Aromatic Polycarbonate Resin and Aromatic Polycarbonate Resin Composition] The recycled resin composition (Component d) of a recycled aromatic polycarbonate resin and aromatic polycarbonate resin composition refers to, for example, a molded article of an aromatic polycarbonate resin or an aromatic polycarbonate resin composition, a crushed product of a sprue or runner generated during molding of an aromatic polycarbonate resin or an aromatic polycarbonate resin composition, and pellets produced by heating this crushed product in an extruder. Therefore, Component d is an aromatic polycarbonate resin or an aromatic polycarbonate resin composition that has a longer thermal history than the aromatic polycarbonate resin or aromatic polycarbonate resin composition before recycling.

[0083] The aromatic polycarbonate resin before recycling is preferably an aromatic polycarbonate resin listed above in [Aromatic Polycarbonate Resin]. The recycled aromatic polycarbonate resin used in the present application may have a hydroxyl group terminal fraction of 10 mol% or less. The aromatic polycarbonate resin before recycling may be the same as or different from the aromatic polycarbonate resin contained in the aromatic polycarbonate resin composition (component a).

[0084] The aromatic polycarbonate resin composition before recycling is preferably an aromatic polycarbonate resin listed above in [Aromatic Polycarbonate Resin], or an aromatic polycarbonate resin composition containing at least one selected from the group consisting of a phosphorus-based antioxidant, a polyether compound, an alicyclic epoxy compound, and an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin, which is contained in the aromatic polycarbonate resin composition (component a), and the aromatic polycarbonate resin composition (component a) is preferred. When the aromatic polycarbonate resin composition is the aromatic polycarbonate resin composition (component a), the recycled aromatic polycarbonate resin composition as component d is the recycled aromatic polycarbonate resin composition (component b).

[0085] The content of the aromatic polycarbonate resin in the recycled aromatic polycarbonate resin composition as component d is preferably 95 to 99.5 mass%, more preferably 98 to 99.5 mass%, and even more preferably 98.5 to 99.5 mass%, from the viewpoint of obtaining an aromatic polycarbonate resin composition that is excellent in initial color tone (YI) during molding and that provides molded articles with excellent long-term heat resistance and long-term moist heat resistance.

[0086] In step 1B, the amount of the recycled aromatic polycarbonate resin and the recycled aromatic polycarbonate resin composition (d component) blended per 100 parts by mass of the aromatic polycarbonate resin composition (a component) is 50 parts by mass or less, preferably 46 parts by mass or less, and more preferably 43 parts by mass or less, from the viewpoint of obtaining an aromatic polycarbonate resin composition (B) that has an excellent initial color tone (YI) during molding and that provides molded articles with excellent long-term heat resistance and long-term moist heat resistance. There is no particular lower limit on the amount of the recycled aromatic polycarbonate resin and the recycled aromatic polycarbonate resin composition (d component), but from the viewpoints of resource reuse and environmental protection, it is preferably 5 parts by mass or more, more preferably 8 parts by mass or more, and even more preferably 10 parts by mass or more, per 100 parts by mass of the aromatic polycarbonate resin composition (a component).

[0087] <Step 2B> The method for producing the aromatic polycarbonate resin composition (B) according to one embodiment of the present invention may include Step 2B. Step 2B is a step of adding at least one selected from a phosphorus-based antioxidant, a polyether compound, an alicyclic epoxy compound, and an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin to the mixture of components a and d obtained in Step 1B. The addition of the compound in Step 2B can be carried out in the same manner as in Step A.

[0088] When a phosphorus-based antioxidant is added in Step 2B, the phosphorus-based antioxidant is added in an amount of preferably 0.005 to 0.3 parts by mass, more preferably 0.007 to 0.26 parts by mass, and even more preferably 0.009 to 0.22 parts by mass relative to 100 parts by mass of the mixture obtained in Step 1B.

[0089] When a polyether compound is added in Step 2B, the polyether compound is added in an amount of preferably 0.05 to 1 part by mass, more preferably 0.07 to 0.8 parts by mass, and even more preferably 0.09 to 0.6 parts by mass, relative to 100 parts by mass of the mixture obtained in Step 1B.

[0090] When an alicyclic epoxy compound is added in Step 2B, the alicyclic epoxy compound is added in an amount of preferably 0.01 to 0.5 parts by mass, more preferably 0.03 to 0.4 parts by mass, and even more preferably 0.04 to 0.35 parts by mass relative to 100 parts by mass of the mixture obtained in Step 1B.

[0091] When an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin is added in Step 2B, the ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin is added in an amount of preferably 0.005 to 0.5 parts by mass, more preferably 0.008 to 0.8 parts by mass, and even more preferably 0.01 to 0.1 parts by mass relative to 100 parts by mass of the mixture obtained in Step 1B.

[0092] [Aromatic Polycarbonate Resin Composition (B)] The aromatic polycarbonate resin composition (B) according to one embodiment of the present invention is an aromatic polycarbonate resin composition (B) produced by the above-described production method.

[0093] The content of the aromatic polycarbonate resin in the aromatic polycarbonate resin composition (B) is preferably 95 to 99.5 mass%, more preferably 98 to 99.5 mass%, and even more preferably 98.5 to 99.5 mass%, from the viewpoint of obtaining an aromatic polycarbonate resin composition that is excellent in initial color tone (YI) during molding and that provides a molded article with excellent long-term heat resistance and long-term moist heat resistance.

[0094] It is difficult to specify the respective contents of the phosphorus-based antioxidant, polyether compound, alicyclic epoxy compound, and ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms with glycerin in the aromatic polycarbonate resin composition (B) because the respective contents of the phosphorus-based antioxidant, polyether compound, alicyclic epoxy compound, and ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms with glycerin in the recycled aromatic polycarbonate resin and the recycled resin composition (component d) of the aromatic polycarbonate resin composition are not constant depending on the source of component d.

[0095] [Method for producing a molded article from aromatic polycarbonate resin composition (B)] A method for producing a molded article from aromatic polycarbonate resin composition (B) according to one embodiment of the present invention includes a step of molding the aromatic polycarbonate resin composition (B) produced by the above-mentioned production method. The molding step may be the same as the steps listed in the method for producing a molded article from aromatic polycarbonate resin composition (A).

[0096] The initial YI4 of a 5 mm thick molded product of the aromatic polycarbonate resin composition (B) in which the molding step was carried out at 280°C was compared with the initial YI4 of a molded product of the aromatic polycarbonate resin composition (component a) in which the molding step was carried out at 280°C. INT２ The absolute value of the difference (ΔYI4) between the initial YI and the YI5 after storing a molded article of the aromatic polycarbonate resin composition (B) at 120°C for 500 hours is preferably less than 0.10, more preferably 0.08 or less, and even more preferably 0.06 or less. INT２The absolute value of the difference (ΔYI5) between the initial YI and the YI6 is preferably 0.35 or less, more preferably 0.33 or less, and even more preferably 0.30 or less. Furthermore, when a molded article of the aromatic polycarbonate resin composition (B) is stored at 85°C and a relative humidity of 85% for 500 hours, the YI6 is compared with the initial YI. INT２ The absolute value of the difference (ΔYI6) between the above values ​​is preferably 0.15 or less, more preferably 0.12 or less, and even more preferably 0.10 or less. An aromatic polycarbonate resin composition (B) having ΔYI4 to ΔYI6 satisfying the above values ​​has excellent initial color tone (YI) during molding, and the molded article has excellent long-term heat resistance and long-term moist heat resistance.

[0097] [Molded Article of Aromatic Polycarbonate Resin Composition (B)] The molded article of aromatic polycarbonate resin composition (B) according to one embodiment of the present invention is a molded article of aromatic polycarbonate resin composition (B) produced by the above-described production method.

[0098] Molded articles of the aromatic polycarbonate resin composition produced by the present invention have excellent initial color tone (YI) during molding, and excellent long-term heat resistance and long-term moist heat resistance, and are therefore suitable for use as optical molded articles such as various lighting covers, display covers, vehicle light guide parts, various light guide plates, lenses, etc.

[0099] The present invention will be explained in more detail by way of examples, but the present invention is not limited to these examples in any way.

[0100] Production Example 1 (Production of aromatic polycarbonate resin composition (resin composition a1)) The components were mixed in the proportions shown in Table 1 and granulated at a resin temperature of 260°C using a vented twin-screw extruder (TEM-37SS, manufactured by Toshiba Machine Co., Ltd.) to obtain pellets of aromatic polycarbonate resin composition a1.

[0101]

[0102] The components shown in Table 1 are as follows: Toughlon FN1500: aromatic homopolycarbonate resin (Toughlon (registered trademark) FN1500 manufactured by Idemitsu Kosan Co., Ltd., viscosity average molecular weight 14,200) Doverphos S9228PC: bis(2,4-dicumylphenyl)pentaerythritol diphosphite (Dover Chemical Company, Ltd., Doverphos S9228PC) Unilube 50DE25R: polyoxyethylene-polyoxypropylene-bisphenol A ether (NOF Corporation, Unilube (registered trademark) 50DE25R, average molecular weight 1,750) Celloxide 2021P: 3',4'-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (Daicel Corporation, Celloxide 2021P) Rikemal S100A: Glycerin monostearate (Rikemal (registered trademark) S100A, manufactured by Riken Vitamin Co., Ltd.)

[0103] Production Example 2-1 (Production of recycled aromatic polycarbonate resin composition (recycled composition b1)) Using a vented twin-screw extruder with a screw diameter of 37 mm (Toshiba Machine Co., Ltd.'s "TEM-37SS"), pellets of the aromatic polycarbonate resin composition a1 produced above were melt-kneaded at a cylinder temperature of 260 ° C. and a discharge rate of 40 kg / h, and pellets were obtained by strand cutting. These were designated as recycled composition b1R1 of aromatic polycarbonate resin composition a1. In the same manner as above, except that the pellets of aromatic polycarbonate resin composition a1 were used as pellets of recycled composition b1R1, a recycled composition b1R2 was obtained by subjecting aromatic polycarbonate resin composition a1 to thermal history twice, a recycled composition b1R3 was obtained by similarly subjecting aromatic polycarbonate resin composition a1 to thermal history three times, and a recycled composition b1R5 was obtained by subjecting aromatic polycarbonate resin composition a1 to thermal history five times.

[0104] Production Example 2-2 (Production of Recycled Aromatic Polycarbonate Resin (Recycled Resin d1)) Pellets of recycled resin d1R1, which was obtained by subjecting an aromatic polycarbonate resin to a single thermal history, were produced in the same manner as in Production Example 2-1, except that the aromatic polycarbonate resin composition a1 was changed to an aromatic polycarbonate resin ("Taflon (registered trademark) A1500" manufactured by Idemitsu Kosan Co., Ltd.: bisphenol A polycarbonate resin, MFR = 50 g / 10 min, viscosity average molecular weight: 15,000, end-capped with p-tert-butylphenoxy groups). Furthermore, recycled resin d1R3, which was obtained by subjecting an aromatic polycarbonate resin to a single thermal history, was produced in the same manner as in Production Example 2-1.

[0105] Examples 1-1 to 1-13 and Comparative Examples 1-1 to 1-4 Using a vented twin-screw extruder with a screw diameter of 37 mm ("TEM-37SS" manufactured by Toshiba Machine Co., Ltd.), the amounts shown in Table 2 of aromatic polycarbonate resin (component c: "Toughlon (registered trademark) FN1500" manufactured by Idemitsu Kosan Co., Ltd.) pellets, the recycled resin composition produced above (component b: recycled composition b1R1), and phosphorus-based antioxidants ("Doverphos S9228PC" manufactured by Dover Chemical Company, "Irgafos 168" manufactured by BASF), polyether compounds ("Unilube (registered trademark) 50DE25R" manufactured by NOF Corporation, "PTMG1000" manufactured by Mitsubishi Chemical Corporation, "Velvetol H1000" manufactured by Allessa GmbH), and alicyclic epoxy compounds ("Celloxide" manufactured by Daicel Corporation) were extruded. The following pellets were melt-kneaded at a cylinder temperature of 260°C and a discharge rate of 40 kg / h, and then strand-cut to obtain pellets for evaluation. The pellets were dried at 120°C for 5 to 7 hours in a hot air circulating dryer. The dried pellets were injection-molded in an ES1000 electric injection molding machine manufactured by Nissei Plastic Industrial Co., Ltd. using a single-cavity mold measuring 90 mm long x 50 mm wide x 5 mm thick at a cylinder temperature of 280°C and a cycle time of 50 seconds. After stabilizing the conditions, five molded products (I) were produced.

[0106] Reference Example 1 Five molded articles were produced in the same manner as in the production of the above molded article (I), except that pellets of an aromatic polycarbonate resin (component c: "Taflon (registered trademark) FN1500" manufactured by Idemitsu Kosan Co., Ltd.) were used instead of the evaluation pellets.

[0107] (Measurement of ΔYI1) For three molded articles (I) obtained in each Example and Comparative Example, the YI values ​​were measured using a spectrophotometer ("U-4100" manufactured by Hitachi High-Tech Corporation) under conditions of a C light source and a 2-degree visual field, and the average value was taken as the initial YI value (YI1). For three molded articles of Reference Example 1, the YI values ​​were measured under the same conditions as for "YI1", and the average was taken as the initial YI value (YI INT１ ) YI1 and YI INT１ The difference ΔYI1 (= YI1 - YI INT１ ) are shown in Table 2.

[0108] (Measurement of ΔYI2) One molded article (I) obtained in each Example, Comparative Example, and Reference Example was stored at 120°C for 500 hours. The YI value of the molded article after storage was measured under the same conditions as for "YI1", and the result was designated as "YI2". INT１ The difference ΔYI2 (= YI2 - YI INT１ ) are shown in Table 2.

[0109] (Measurement of ΔYI3) One molded article (I) obtained in each Example, Comparative Example, and Reference Example was stored at 85°C and a relative humidity of 85% for 500 hours. The YI value of the molded article after storage was measured under the same conditions as for "YI1", and the result was designated as "YI3". INT１ The difference ΔYI3 (= YI3 - YI INT１ ) are shown in Table 2.

[0110]

[0111]

[0112] The components shown in Table 2 are as shown in Table 1.

[0113] As shown in Table 2, the aromatic polycarbonate resin compositions of Examples 1-1 to 1-13 were superior in initial color tone (YI) during molding and the molded articles were superior in long-term heat resistance and long-term moist heat resistance compared to the aromatic polycarbonate resin compositions of Comparative Examples 1-1 to 1-4. Furthermore, the aromatic polycarbonate resin compositions of Examples 1-1 to 1-13 were comparable in initial color tone (YI) during molding and in the long-term heat resistance and long-term moist heat resistance of the molded articles compared to virgin aromatic polycarbonate resin materials that did not contain recycled resin compositions.

[0114] Examples 2-1 to 2-12 and Comparative Examples 2-1 to 2-5 Using a vented twin-screw extruder with a screw diameter of 37 mm (Toshiba Machine Co., Ltd. "TEM-37SS"), pellets of resin composition a1 and pellets of recycled resin composition b1 or recycled resin d1 were obtained in the amounts shown in Table 3, and these were mixed for 1 minute in a pellet blender (Tokuju Machine Works Co., Ltd. "W-100") and then dried in a hot air circulation dryer for 5 to 7 hours at 120 ° C. The dried evaluation pellets were injection molded using an ES1000 electric injection molding machine manufactured by Nissei Plastic Industrial Co., Ltd., using a single-cavity mold measuring 90 mm long x 50 mm wide x 5 mm thick, at a cylinder temperature of 280 ° C. and a cycle time of 50 seconds. After stabilizing the conditions, five molded articles (II) were produced.

[0115] Reference Example 2 Five molded articles of resin composition a1 were produced in the same manner as in the production of molded article (II) above, except that pellets of resin composition a1 were used instead of the evaluation pellets.

[0116] (Measurement of ΔYI4) For three molded articles (II) obtained in each Example and Comparative Example, the YI values ​​were measured using a spectrophotometer ("U-4100" manufactured by Hitachi High-Tech Corporation) under conditions of a C light source and a 2-degree field of view, and the average value was taken as the initial YI value "YI4". For three molded articles of Reference Example 2, the YI values ​​were measured under the same conditions as "YI4", and the average was taken as the initial YI value (YI INT２ ) YI4 and YI INT２ The difference ΔYI4 (= YI4 - YI INT２ ) are shown in Table 3.

[0117] (Measurement of ΔYI5) One molded article (II) obtained in each Example, Comparative Example, and Reference Example was stored at 120°C for 500 hours. The YI value of the molded article after storage was measured under the same conditions as for "YI4", and the result was designated as "YI5". INT２ The difference ΔYI5 (= YI5 - YI INT２ ) are shown in Table 3.

[0118] (Measurement of ΔYI6) One molded article (II) obtained in each Example, Comparative Example, and Reference Example was stored at 85°C and a relative humidity of 85% for 500 hours. The YI value of the molded article after storage was measured under the same conditions as for "YI4", and the result was designated as "YI6". INT２ The difference ΔYI6 (= YI6 - YI INT２ ) are shown in Table 3.

[0119]

[0120] As shown in Table 3, the aromatic polycarbonate resin compositions of Examples 2-1 to 2-12 were superior in initial color tone (YI) at the time of molding compared to the aromatic polycarbonate resin compositions of Comparative Examples 2-1 to 2-5, and the molded articles were found to have excellent long-term heat resistance and long-term moist heat resistance. Furthermore, the results of Examples 2-2 to 2-4, Examples 2-5 to 2-7, and Examples 2-8 to 2-9 revealed that, regardless of the number of times the recycled resin composition (component d) had been recycled, the recycled resin composition (B) was superior in initial color tone (YI) at the time of molding, and the molded articles were found to have excellent long-term heat resistance and long-term moist heat resistance. The same was also found in Examples 2-11 and 2-12, which contained a recycled resin as component d. Furthermore, the aromatic polycarbonate resin compositions of Examples 2-1 to 2-12 were found to be comparable in initial color tone (YI) at the time of molding and in the long-term heat resistance and long-term moist heat resistance of the molded articles compared to non-recycled aromatic polycarbonate resin compositions (component a).

[0121] Comparative Examples 3-1 to 3-3 Using a vented twin-screw extruder with a screw diameter of 37 mm (Toshiba Machine Co., Ltd.'s "TEM-37SS"), pellets of aromatic polycarbonate resin (Idemitsu Kosan Co., Ltd.'s "Toughlon (registered trademark) A1500") and pellets of recycled resin d1 in the amounts shown in Table 4 were melt-kneaded at a cylinder temperature of 260 ° C. and a discharge rate of 40 kg / h, and pellets for evaluation were obtained by strand cutting. The evaluation pellets were dried at 120 ° C. for 5 to 7 hours in a hot air circulation dryer. The dried evaluation pellets were injection molded using an ES1000 electric injection molding machine manufactured by Nissei Plastic Industrial Co., Ltd., using a single-cavity mold with dimensions of 90 mm length x 50 mm width x 5 mm thickness, at a cylinder temperature of 280 ° C. and a cycle time of 50 seconds. After stabilizing the conditions, five molded products (III) were produced.

[0122] Reference Example 3 Five molded articles of component c were produced in the same manner as in the production of molded article (III) above, except that pellets of an aromatic polycarbonate resin (component c: "Taflon (registered trademark) A1500" manufactured by Idemitsu Kosan Co., Ltd.) were used instead of the evaluation pellets.

[0123] (Measurement of ΔYI7) For the three molded articles (III) obtained in each Comparative Example, the YI values ​​were measured using a spectrophotometer ("U-4100" manufactured by Hitachi High-Tech Corporation) under conditions of a C light source and a 2-degree visual field, and the average value was taken as the initial YI value (YI7). For the three molded articles of Reference Example 3, the YI values ​​were measured under the same conditions as for "YI7", and the average was taken as the initial YI value (YI INT３ ) YI7 and YI INT３ The difference ΔYI7 (= YI7 - YI INT３ ) are shown in Table 4.

[0124] (Measurement of ΔYI8) One molded article (III) obtained in each Reference Example and Comparative Example was stored at 120°C for 500 hours. The YI value of the molded article after storage was measured under the same conditions as for "YI7" and was designated as "YI8". INT３ The difference ΔYI8 (= YI8 - YI INT３ ) are shown in Table 4.

[0125] (Measurement of ΔYI9) One molded article (III) obtained in each Reference Example and Comparative Example was stored at 85°C and a relative humidity of 85% for 500 hours. The YI value of the molded article after storage was measured under the same conditions as for "YI7" and was designated as "YI9". The obtained YI9 and the above YI INT３ The difference ΔYI9 (= YI9 - YI INT３ ) are shown in Table 4.

[0126]

[0127] As shown in Table 4, the aromatic polycarbonate resins containing recycled resins of Comparative Examples 3-1 to 3-3, which did not contain the aromatic polycarbonate resin composition (component a) or its recycled resin composition (component b), were inferior to molded articles of aromatic polycarbonate resin as virgin material, particularly in long-term heat resistance and long-term moist heat resistance of the molded articles.

[0128] Molded articles of the aromatic polycarbonate resin composition produced by the present invention have excellent initial color tone (YI) during molding, and excellent long-term heat resistance and long-term moist heat resistance, and are therefore suitable for use as optical molded articles such as various lighting covers, display covers, vehicle light guide parts, various light guide plates, lenses, etc.

Claims

1. A process for producing a resin composition comprising: an aromatic polycarbonate resin (component c); 50 parts by mass or less of a recycled resin composition (component b) of an aromatic polycarbonate resin composition (component a) per 100 parts by mass of the aromatic polycarbonate resin (component c); and, per 100 parts by mass of the aromatic polycarbonate resin (component c) and the recycled resin composition (component b), 0.005 to 0.3 parts by mass of a phosphorus-based antioxidant, 0.05 to 1 part by mass of a polyether compound, and at least one selected from the group consisting of 0.01 to 0.5 parts by mass of an alicyclic epoxy compound and 0.005 to 0.5 parts by mass of an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin; The method for producing an aromatic polycarbonate resin composition (A), wherein the aromatic polycarbonate resin composition (component a) contains 0.01 to 1 part by mass of a phosphorus-based antioxidant and 0.1 to 0.6 parts by mass of a polyether compound per 100 parts by mass of the aromatic polycarbonate resin.

2. The method for producing an aromatic polycarbonate resin composition (A) according to claim 1, wherein the aromatic polycarbonate resin composition (component a) further contains 0.01 to 0.3 parts by mass of an alicyclic epoxy compound.

3. The method for producing aromatic polycarbonate resin composition (A) according to claim 1 or 2, wherein the aromatic polycarbonate resin composition (component a) further comprises 0.01 to 0.05 parts by mass of an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin.

4. A method for producing a molded article of an aromatic polycarbonate resin composition (A), comprising a step of molding the aromatic polycarbonate resin composition (A) produced by the production method according to any one of claims 1 to 3.

5. The initial YI1 of a 5 mm thick molded product of the aromatic polycarbonate resin composition (A) in which the molding step was carried out at 280°C, and the initial YI of a molded product of the aromatic polycarbonate resin (component c) in which the molding step was carried out at 280°C. INT１ the absolute value of the difference (ΔYI1) between the initial YI and the YI2 after storing a molded article of the aromatic polycarbonate resin composition (A) at 120°C for 500 hours is less than 0.10; INT１ and the absolute value of the difference (ΔYI2) between the initial YI and the YI3 after storing a molded article of the aromatic polycarbonate resin composition (A) at 85°C and a relative humidity of 85% for 500 hours is 0.35 or less. INT１ The method for producing a molded article of the aromatic polycarbonate resin composition (A) according to claim 4, wherein the absolute value of the difference (ΔYI3) between the values ​​is 0.10 or less.

6. An aromatic polycarbonate resin composition (A) produced by the production method according to any one of claims 1 to 3.

7. A molded article of aromatic polycarbonate resin composition (A) produced by the production method according to claim 4 or 5.

8. A method for producing an aromatic polycarbonate resin composition (B), comprising step 1B of mixing an aromatic polycarbonate resin composition (component a) with 50 parts by mass or less of at least one selected from a recycled aromatic polycarbonate resin and a recycled resin composition of an aromatic polycarbonate resin composition (component d) per 100 parts by mass of the aromatic polycarbonate resin composition (component a), wherein the aromatic polycarbonate resin composition (component a) contains 0.01 to 1 part by mass of a phosphorus-based antioxidant and 0.1 to 0.6 part by mass of a polyether compound per 100 parts by mass of the aromatic polycarbonate resin.

9. The method for producing an aromatic polycarbonate resin composition (B) according to claim 8, wherein the aromatic polycarbonate resin composition (component a) further contains 0.01 to 0.3 parts by mass of an alicyclic epoxy compound.

10. The method for producing an aromatic polycarbonate resin composition (B) according to claim 8 or 9, wherein the aromatic polycarbonate resin composition (component a) further comprises 0.01 to 0.05 parts by mass of an ester of an aliphatic carboxylic acid having 12 to 22 carbon atoms and glycerin.

11. A method for producing a molded article of an aromatic polycarbonate resin composition (B), comprising a step of molding the aromatic polycarbonate resin composition (B) produced by the production method according to any one of claims 8 to 10.

12. The initial YI4 of a molded article of 5 mm thickness of the aromatic polycarbonate resin composition (B) in which the molding step was carried out at 280°C, and the initial YI4 of a molded article of the aromatic polycarbonate resin composition (component a) in which the molding step was carried out at 280°C. INT２ the absolute value of the difference (ΔYI4) between the initial YI5 and the YI6 after storing a molded article of the aromatic polycarbonate resin composition (B) at 120°C for 500 hours is less than 0.10; INT２ and the absolute value of the difference (ΔYI5) between the initial YI and the YI6 after storing a molded article of the aromatic polycarbonate resin composition (B) at 85% for 500 hours is 0.35 or less. INT２ The method for producing a molded article of the aromatic polycarbonate resin composition (B) according to claim 11, wherein the absolute value of the difference (ΔYI6) between the values ​​is 0.15 or less.

13. An aromatic polycarbonate resin composition (B) produced by the production method according to any one of claims 8 to 10.

14. A molded article of aromatic polycarbonate resin composition (B) produced by the production method according to claim 11 or 12.

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