Aromatic polycarbonate resin composition

Abstract

A polycarbonate resin composition having good hue, excellent transparency, and excellent heat resistance to discoloration. [Solution] An aromatic polycarbonate resin composition characterized by containing 0.01 to 4 parts by mass of a polyether compound (B) and 0.00001 to 0.004 parts by mass of a trialkyl phosphite (C) per 100 parts by mass of an aromatic polycarbonate resin (A).

Description

[Technical Field]

[0001] The present invention relates to an aromatic polycarbonate resin composition, and more specifically to an aromatic polycarbonate resin composition having good hue, excellent transparency and excellent heat discoloration resistance, and a molded article obtained by molding the same. [Background Art]

[0002] Liquid crystal display devices used in personal computers, mobile phones and the like incorporate a planar light source device to meet the requirements for thinning, weight reduction, energy saving and high definition. This planar light source device is provided with a light guide plate having a wedge-shaped cross-section with a uniform inclined surface on one side or a flat-plate-shaped light guide plate for the purpose of uniformly and efficiently guiding incident light to the liquid crystal display side. There are also products in which a concavo-convex pattern is formed on the surface of the light guide plate to impart a light scattering function.

[0003] Such a light guide plate is obtained by injection molding of a thermoplastic resin, and the above-mentioned concavo-convex pattern is imparted by transferring the concavo-convex portion formed on the surface of a nested mold. Conventionally, light guide plates have been molded from resin materials such as polymethyl methacrylate (PMMA), but recently, there has been a demand for display devices that produce clearer images, and the heat generated near the light source tends to increase the temperature inside the device. Therefore, they are being replaced by polycarbonate resin materials with higher heat resistance.

[0004] However, although polycarbonate resins are excellent in mechanical properties, thermal properties, electrical properties, weather resistance, light transmittance, and transparency, there has recently been a demand for reducing the chromaticity difference between the light incident part of a light guide plate and a location distant from the light incident part, and polycarbonate resins have the problem of being more prone to yellowing than PMMA.

[0005] Patent Document 1 proposes incorporating polyalkylene glycol, composed of linear alkyl groups, into polycarbonate resin to improve transmittance and hue, and improvements in transmittance and yellowing (yellow index: YI) can be seen by incorporating polytetramethylene ether glycol.

[0006] In particular, in recent years, optical components such as light guide plates have become highly integrated in mobile devices such as smartphones and tablet devices. Therefore, optical components such as light guide plates are strongly required to have not only excellent hue (YI) and high transparency, but also excellent heat resistance, meaning they do not easily discolor even when heated by rising temperatures during use. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Patent No. 5699188 [Overview of the project] [Problems that the invention aims to solve]

[0008] This invention has been made in view of the above circumstances, and its object is to provide an aromatic polycarbonate resin composition having good hue, excellent transparency, and excellent heat discoloration resistance, and a molded article formed therefrom. [Means for solving the problem]

[0009] In order to achieve the above objectives, the inventors conducted extensive research and found that an aromatic polycarbonate resin composition containing a specific small amount of a polyether compound and a trialkyl phosphite has good hue, excellent transparency, and excellent heat discoloration resistance, thus completing the present invention. The present invention relates to the following aromatic polycarbonate resin compositions and molded articles.

[0010] 1. An aromatic polycarbonate resin composition, comprising 0.01 to 4 parts by mass of a polyether compound (B) and 0.00001 to 0.004 parts by mass of a trialkyl phosphite (C), based on 100 parts by mass of an aromatic polycarbonate resin (A). 2. The aromatic polycarbonate resin composition according to the above 1, wherein an alkyl group of the trialkyl phosphite (C) is an alkyl group having 6 to 30 carbon atoms. 3. The aromatic polycarbonate resin composition according to the above 1 or 2, wherein the polyether compound (B) is a polyether compound represented by the following general formula (I). B 1 O-(A 1 -O) a -X-(A 2 -O) b -B 2 (I) (in formula (I), A 1 represents a linear or branched hydrocarbon group having 2 to 6 carbon atoms; A 2 represents a linear or branched hydrocarbon group having 7 to 20 carbon atoms, which may be substituted with an allyloxy group or an alkoxy group; B 1 and B 2 each independently represent a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms; X represents a single bond or a divalent organic group; a represents an integer of 0 or 1 or more; b represents an integer of 0 or 1 or more; when a or b is 2 or more, each of A 1 and A 2 may be the same or different hydrocarbon groups.) 4. The aromatic polycarbonate resin composition according to the above 3, wherein A 1 in the general formula (I) is an alkylene group selected from the group consisting of 1,2-ethylene group, 1,2-propylene group, trimethylene group, 1,2-butylene group and tetramethylene group.

[0011] 5. The aromatic polycarbonate resin composition according to any one of the above 1 to 4, wherein the number average molecular weight (Mn) of the polyether compound (B) is 200 to 10,000. 6. An aromatic polycarbonate resin composition according to any one of 1 to 5 above, wherein the viscosity-average molecular weight (Mv) of the aromatic polycarbonate resin (A) is 10,000 to 50,000. 7. The aromatic polycarbonate resin composition according to any one of 1 to 6 above, further containing a phosphorus-based stabilizer (D) other than trialkyl phosphite (C) in an amount of 0.005 to 0.5 parts by mass per 100 parts by mass of aromatic polycarbonate resin (A). 8. The aromatic polycarbonate resin composition according to item 7 above, wherein the phosphorus-based stabilizer (D) is a phosphorus-based compound having a phosphite structure. 9. The aromatic polycarbonate resin composition according to 8 above, wherein the phosphorus-based stabilizer (D) contains two or more phosphorus-based compounds having a phosphite structure, one or more of which are phosphite compounds having a spiro-ring skeleton. 10. An aromatic polycarbonate resin composition according to any one of 1 to 9 above, further containing 0.0005 to 0.2 parts by mass of an epoxy compound and / or oxetane compound (E) per 100 parts by mass of aromatic polycarbonate resin (A). 11. An aromatic polycarbonate resin composition according to any one of claims 1 to 10, further comprising 0.005 to 0.5 parts by mass of fatty acid ester (F) per 100 parts by mass of aromatic polycarbonate resin (A).

[0012] 12. Pellets comprising the aromatic polycarbonate resin composition described in any of items 1 to 11 above. 13. A molded body obtained by molding the pellets described in item 12 above. 14. The molded body described in item 13 above, which is an optical component. 15. The optical component described in item 14 above, which is a light guide member. [Effects of the Invention]

[0013] The aromatic polycarbonate resin composition of the present invention has good hue, excellent transparency, and excellent heat discoloration resistance. Furthermore, molded articles made from the aromatic polycarbonate resin composition of the present invention have excellent hue with a low YI value, good transparency, and excellent heat discoloration resistance, making them particularly suitable for use as optical components. [Modes for carrying out the invention]

[0014] The present invention will be described in detail below with reference to embodiments and examples. In this specification, unless otherwise specified, "~" means that the numbers before and after it are included as the lower and upper limits.

[0015] The aromatic polycarbonate resin composition of the present invention is characterized by containing 0.01 to 4 parts by mass of a polyether compound (B) and 0.00001 to 0.004 parts by mass of a trialkyl phosphite (C) per 100 parts by mass of an aromatic polycarbonate resin (A).

[0016] The following describes in detail each component and molded article constituting the aromatic polycarbonate resin composition of the present invention.

[0017] [Polyether compound (B)] The polyether compound (B) is preferably a polyether compound (B1) represented by the following general formula (I). B 1 O-(A 1 -O) a -X-(A 2 -O) b -B 2 (I) In formula (I), A 1 A is a straight-chain or branched hydrocarbon group with 2 to 6 carbon atoms. 2 This refers to a linear or branched hydrocarbon group having 7 to 20 carbon atoms, which may be substituted with an alliloxy group (also called an allyloxy group) or an alkoxy group, and B 1 and B 2Each of the following independently represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms, and X represents a single bond or a divalent organic group. a represents 0 or an integer of 1 or more, b represents 0 or an integer of 1 or more (except when a and b are both 0), and if a is 0, b represents an integer of 2 or more, and if b is 0, a represents an integer of 2 or more. If a or b is 2 or more, A 1 and A 2 Each of these may be the same hydrocarbon group or different hydrocarbon groups.

[0018] A 2 As a linear hydrocarbon group having 7 to 20 carbon atoms, alkylene groups having 7 to 20 carbon atoms are preferred, for example, heptamethylene group (7 carbon atoms), octamethylene group (8 carbon atoms), nonamethylene group (9 carbon atoms), decamethylene group (10 carbon atoms), undecamethylene group (11 carbon atoms), dodecamethylene group (12 carbon atoms), tridecamethylene group (13 carbon atoms), etc. As a linear hydrocarbon group having 7 to 20 carbon atoms, alkylene groups having 7 to 13 carbon atoms are more preferred. A linear alkylene group A with 7 to 20 carbon atoms 2 A 2 By having an alkylene oxy unit of -O, the compatibility with aromatic polycarbonate resin (A) is improved, resulting in an aromatic polycarbonate resin composition with excellent transparency and color.

[0019] A 2As for the branched hydrocarbon group having 7 to 20 carbon atoms, branched alkylene groups having 7 to 20 carbon atoms are preferred, for example, sec-heptylene group, tert-heptylene group, isoheptylene group, sec-octylene group, tert-octylene group, isooctylene group, 1-ethylhexylene group, 1-propylpentylene group, 2-ethylhexylene group, 2-propylpentylene group, sec-nonylene group, tert-nonylene group, neononylene group, 1-ethylheptylene group, 1-propylhexylene group, 1-butylpentylene group, 2-ethylheptylene group, 2-propylhex Silene group, 2-butylpentylene group, isodecylene group, sec-decylene group, tert-decylene group, neodecylene group, 1-ethyloctylene group, 1-propylheptylene group, 1-butylhexylene group, 2-ethyloctylene group, 2-propylheptylene group, 2-butylhexylene group, isoundecylene group, sec-undecylene group, tert-undecylene group, neoundecylene group, 1-ethylnonylene group, 1-propyloctylene group, 1-butylheptylene group, 1-pentylhexylene group, 2-ethylnonylene group, 2-propyloctylene group, 2-butyl Hepylene group, 2-pentylhexylene group, isododecylene group, sec-dodecylene group, tert-dodecylene group, neododecylene group, 1-ethyldecylene group, 1-propylnonylene group, 1-butyloctylene group, 1-pentylheptylene group, 2-ethyldecylene group, 2-propylnonylene group, 2-butyloctylene group, 2-pentylheptylene group, isotridecylene group, sec-tridecylene group, tert-tridecylene group, neotridecylene group, 1-ethylundecylene group, 1-propyldecylene group, 1-butylnonylene group, 1-pentyloctylene Group, 1-hexylheptylene group, 2-ethylundecylene group, 2-propyldecylene group, 2-butyloctylene group, 2-pentyloctylene group, 2-hexylheptylene group, isotetradecylene group, sec-tetradecylene group, tert-tetradecylene group, neotetradecylene group, 1-ethyldodecylene group, 1-propylundecylene group, 1-butyldecylene group, 1-pentylnonylene group, 1-hexyloctylene group, 2-ethyldodecylene group, 2-propylundecylene group, 2-butyldecylene group, 2-pentylnonylene group, 2-hexyloctylene group,Examples include isopentadecylene group, sec-pentadecylene group, tert-pentadecylene group, neopentadecylene group, isohexadecylene group, sec-hexadecylene group, tert-hexadecylene group, neohexadecylene group, isoheptadecylene group, sec-heptadecylene group, tert-heptadecylene group, neoheptadecylene group, isooctadecyl (isostearyl) group, sec-octadecylene group, tert-octadecylene group, neooctadecylene group, isononadecylene group, sec-nonadecylene group, tert-nonadecylene group, neonononadecylene group, isoicosilene group, sec-icosilene group, tert-icosilene group, and neoicosilene group. As branched alkylene groups, alkylene groups having 7 to 13 carbon atoms are more preferred. , Branched alkylene group A with 7 to 20 carbon atoms 2 A 2 By having an alkylene oxy unit of -O, the compatibility with aromatic polycarbonate resin (A) is improved, resulting in an aromatic polycarbonate resin composition with excellent transparency and color.

[0020] A 2 The linear or branched hydrocarbon group having 7 to 20 carbon atoms may have an aromatic ring (aromatic group) or an alicyclic hydrocarbon group. For example, those having an aromatic ring, such as the 1-phenylethylene group, are also preferred. 2 Ether unit A is 1-phenyl-1,2-ethylene 2 -O can be produced using styrene oxide or 1-phenylethylene glycol as a raw material. Examples of oxide compounds similar to 1-phenyl-1,2-ethylene include α-methylstyrene oxide, naphthalene oxide, and 1,1'-diphenylstyrene oxide. These are preferred because an aromatic ring is introduced as a side chain to the alkylene group, which particularly improves compatibility with aromatic polycarbonate resin (A).

[0021] Furthermore, it is also preferable that the alkylene group is shared with an aromatic ring or an alicyclic hydrocarbon group, for example, 1,2-epoxycyclohexane and 1,2-epoxy-4-vinylcyclohexane. By having alkylene oxy units containing aromatic rings or alicyclic hydrocarbon groups, an aromatic polycarbonate resin composition can be obtained that has improved compatibility with aromatic polycarbonate resin (A), excellent transparency, and excellent color.

[0022] Linear or branched hydrocarbon group A with 7 to 20 carbon atoms 2 It may be substituted with an aliloxy group or an alkoxy group. For example, those having an aromatic ring, such as a 1-phenoxymethyl group, are also preferred. 2 Ether unit A is (1-phenoxymethyl)-1,2-ethylene 2 -O can be produced using phenylglycidyl ether as a raw material. Similar to (1-phenoxymethyl)-1,2-ethylene, an example of an oxide compound is hexylglycidyl ether. These are preferred because an aliloxy group or an alkoxy group is introduced as a side chain to the alkylene group, which particularly improves compatibility with aromatic polycarbonate resin (A).

[0023] A 2 Among the above, alkylene groups having an aromatic ring or alicyclic hydrocarbon group in the side chain are preferred, and 1-phenylethylene groups and (1-phenoxymethyl)-1,2-ethylene groups are particularly preferred. Note A 2 -If the number of units b is 2 or more, A 2 These may be the same hydrocarbon group or different hydrocarbon groups.

[0024] A 1 It is a straight-chain or branched hydrocarbon group with 2 to 6 carbon atoms. Examples of linear hydrocarbon groups having 2 to 6 carbon atoms include the 1,2-ethylene group, trimethylene group, tetramethylene group, pentamethylene group, and hexamethylene group. Examples of branched hydrocarbon groups having 2 to 6 carbon atoms include 1,2-propylene, sec-butylene, isobutylene, tert-butylene, 1-methylbutylene, 1-ethylpropylene, 2-methylbutylene, 3-methylbutylene, 1,2-dimethylpropylene, 1,1-dimethylpropylene, tert-amyl, 1,3-dimethylbutylene, 3,3-dimethylbutylene, 1-methylpentylene, 1-ethylbutyl, and 2-ethylbutyl. A 1 Among these, 1,2-ethylene groups, 1,2-propylene groups, trimethylene groups, 1,2-butylene groups, and tetramethylene groups are preferred, with 1,2-propylene groups and tetramethylene groups being particularly preferred.

[0025] A 1 -If the number of units a is 2 or more, A 1 These may be the same hydrocarbon group or different hydrocarbon groups.

[0026] In general formula (I), X is either a single bond or a divalent organic group, but as a divalent organic group, X 1 -O( Here X 1 It is preferable that it be represented by a divalent organic group which may have an aromatic ring. 1 The residues obtained by removing the OH group from a diol compound (hereinafter also referred to as residues) are preferred, and examples of preferred residues include linear or branched alkylene groups having 1 to 12 carbon atoms such as ethylene, propylene, butylene, neopentylene, n-pentamethylene, and n-hexamethylene groups, phenylene groups, divalent groups represented by the formula -CH2-Ph-CH2- or -CH2-Ph-Ph-CH2- (where Ph represents the phenylene group), aromatic diol compound residues such as bisphenol A residues, bisphenol F residues, and bisphenol Z residues.

[0027] X 1It is also preferable that the residue is obtained by removing the OH group from an alicyclic diol compound. Examples of such alicyclic diols include cyclobutanediols such as 2,2,4,4-tetramethyl-1,3-cyclobutanediol, cyclohexanediols such as 1,4-cyclohexanediol, 1,2-cyclohexanediol, 1,3-cyclohexanediol, and 2-methyl-1,4-cyclohexanediol, and cyclohexanedimethanol such as 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, and 1,4-cyclohexanedimethanol. Examples include norbornane dimethanol compounds such as 2,2-bis(4-hydroxycyclohexyl)propane (i.e., hydrogenated bisphenol A), 2,3-norbornane dimethanol, and 2,5-norbornane dimethanol, tricyclodecane dimethanol, pentacyclopentadecanedimethanol, 1,3-adamantanediol, 2,2-adamantanediol, decalin dimethanol, and 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane (i.e., spiroglycol).

[0028] Among those mentioned above, X is either a single bond or the above X 1 Preferably, this is a bisphenol A residue or a hydrogenated bisphenol A residue.

[0029] In general formula (I), B 1 and B 2 Each of these is independently a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms. Examples of hydrocarbon groups having 1 to 30 carbon atoms include alkyl groups having 1 to 30 carbon atoms, alkenyl groups having 2 to 30 carbon atoms, alkanoyl groups having 1 to 30 carbon atoms, alkenoyl groups having 2 to 30 carbon atoms, aryl groups having 6 to 30 carbon atoms, or aralkyl groups having 7 to 30 carbon atoms.

[0030] Alkyl and alkenyl groups may be linear, branched, or cyclic. Examples include methyl, ethyl, n-propyl, isopropyl, various butyl, pentyl, hexyl, octyl, cyclopentyl, cyclohexyl, allyl, propenyl, various butenyl, hexenyl, octenyl, cyclopentenyl, and cyclohexenyl groups. Examples of aryl groups include phenyl, tolyl, and xylyl groups. Examples of aralkyl groups include benzyl, phenethyl, and methylbenzyl groups.

[0031] Alkanoyl groups having 1 to 30 carbon atoms may be linear or branched, and examples include methanoloyl, ethanoloyl, 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 viewpoint of compatibility, thermal stability, and ease of manufacture.

[0032] Alkenoyl groups having 2 to 30 carbon atoms may be linear or branched, and examples include etenoyl group, n-propenoyl group, isopropenoyl group, n-butenoyl group, t-butenoyl group, n-hexenoyl group, n-octenoyl group, n-decenoyl group, and n-dodecenoyl group. Among these, alkenoyl groups having 2 to 10 carbon atoms are preferred from the viewpoint of low molecular weight, compatibility and solubility, and ease of manufacture, and alkenoyl groups having 2 to 6 carbon atoms are more preferred.

[0033] B 1 and B 2 It is preferable that the terminal group is a hydrogen atom, and the terminal group of the polyether compound (B1) is preferably a hydroxyl group. However, if the terminal is R 1 , R 2 Even if the hydrocarbon group is blocked, it does not affect the performance and the effects of the present invention can be expressed in the same way.

[0034] In the general formula (I) described above, a is 0 or an integer greater than or equal to 1, b is 0 or an integer greater than or equal to 1, and the polyether compound (B1) is A 1 -O units are not available 2 -It may consist only of units O. a is preferably 0 or 1 to 100, more preferably 5 to 50, even more preferably 10 to 45, among which 15 to 40, and especially preferably 20 to 35. b is preferably 1 to 100, more preferably 1 to 30, even more preferably 1 to 20, among which 1 to 15, and especially preferably 1 to 10.

[0035] A in general formula (I) 1 -O units and A 2 - A preferred ratio of units of 0, 1 -O unit: A 2 Expressed in terms of a molar ratio of -0 units, it is 0-99:100-1, more preferably 50-99:50-1, and even more preferably 75-99:25-1.

[0036] The polyether compound (B1) described above can be produced by conventionally known methods for producing polyethers, and can usually be produced by polycondensation of the raw material oxide, glycol, or polyether-forming derivative thereof using an acid catalyst. The resulting polyether compound (B1) is not a single compound, but is usually a mixture of polymers, so a and b can be considered as their average values, and in that case they may not be integers.

[0037] As described above, the polyether compound (B1) is A in general formula (I). 1 The group is preferably a 1,2-ethylene group, a 1,2-propylene group, a trimethylene group, a 1,2-butylene group, or a tetramethylene group. 2 It is preferable that is a 1-phenylethylene group or a (1-phenoxymethyl)ethylene group, but A 1 is a 1,2-propylene group or a tetramethylene group, and A 2It is more preferable that the group is a 1-phenylethylene group or a (1-phenoxymethyl)ethylene group. Particularly preferred polyether compounds (B1) include those represented by the following general formula. HO-(CH2CH2CH2O) m -H (In the formula, m is equivalent to a in the general formula (I) above, except when m is 0.) HO-(CH2CH2CH2CH2O) m -(CH2CH(CH3)O) n -H (In the formula, m and n are equivalent to a and b in the general formula (I) above, respectively.)

[0038] Another preferred polyether compound (B) is a polylactone-polyether copolymer. Polylactone-polyether copolymers are copolymers composed of units derived from lactone compounds and ether units derived from ether or polyglycol. They may be random copolymers or block copolymers, but block copolymers consisting of polylactone blocks and polyether blocks are preferred, and block copolymers in which polylactones are linked to the ends of the polyether are preferred.

[0039] As the polylactone-polyether copolymer, a polylactone-polyether copolymer having a molar ratio of lactone units to ether units of 30-95:70-5 is preferred. By including a material with a molar ratio of lactone units to ether units of 30-95:70-5, it is possible to obtain a molded article with a low YI value, extremely good hue, and high transparency. The molar ratio of lactone units to ether units is more preferably 35-90:65-10, even more preferably 40-85:60-15, even more preferably 50-75:50-25, and particularly preferably 60-65:40-35. Furthermore, the molar ratio of each unit in the polylactone-polyether copolymer is measured as follows: 1The measurement is performed using a 1H-NMR spectrometer with 1,1,2,2-tetrachloroethane-d2 as the solvent.

[0040] Examples of lactone compounds include cyclic lactone compounds such as ε-caprolactone, γ-butyrolactone, δ-valerolactone, β-propiolactone, and pivalolactone, which can be used alone or in combination. Among the lactone compounds, ε-caprolactone is particularly preferred.

[0041] The ether unit, denoted as -[RO]-, is preferably a linear or branched hydrocarbon group having 2 to 20 carbon atoms, where R is a linear or branched group. R may be substituted with an aliloxy group or an alkoxy group, and may have an aromatic ring, such as a 1-phenoxymethyl group.

[0042] R is preferably a hydrocarbon group having 2 to 6 carbon atoms, particularly an alkylene group. Examples of linear hydrocarbon groups having 2 to 6 carbon atoms include the 1,2-ethylene group, trimethylene group, tetramethylene group, pentamethylene group, and hexamethylene group. Examples of branched hydrocarbon groups having 2 to 6 carbon atoms include 1,2-propylene group, 1,2-butylene group, 2-methyl(1,2-propylene group), 2,2-dimethyl(1,2-propylene group), 1,2-dimethyl(1,2-propylene group), 1-methyl(1,2-propylene group), 1,2,2-trimethyl(1,2-propylene group), 2-methyl(1,2-butylene group), 1-methyl(1,2-butylene group), 1-isopropylene(1,2-ethylene group), 2-methyl,1-isopropylene(1,2-ethylene group), 1-tert-butyl(1,2-ethylene group), 2-ethyl(1,2-butylene group), 1-ethyl(1,2-butylene group), 1,1-dimethyltrimethylene group, 2-methyltetramethylene group, and 1-methylpentylene group. Among these, R is preferably a 1,2-ethylene group, a 1,2-propylene group, a trimethylene group, a 1,2-butylene group, or a tetramethylene group, with 1,2-propylene, trimethylene, or a tetramethylene group being particularly preferred. R may be the same hydrocarbon group, or it may be composed of different hydrocarbon groups.

[0043] The method for producing the polylactone-polyether copolymer is not particularly limited and can be produced by known methods. For example, a method of ring-opening polymerization of a lactone compound followed by esterification copolymerization (block copolymerization) with a polyether glycol or alkylene oxide having the ether units described above is preferred.

[0044] During copolymerization, diol compounds, triol compounds, etc., may be present. Examples of diol compounds include ethylene glycol, diethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 2-methyl-1,3-propanediol, 2-methyl-1,4-butanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 1,9-nonanediol, 1,10-decanediol, neopentyl glycol, 2-ethyl-2-n-butyl-1,3-propanediol, 2-ethyl-2-hexyl-1,3-propanediol, and cyclohexanedimethanol. Examples of triol compounds include glycerin, trimethylolethane, trimethylolpropane, butanetriol, pentanetriol, hexanetriol, heptanetriol, and octantriol, among which glycerin and trimethylolpropane are preferred. When a triol compound is used, the polylactone-polyether copolymer becomes a three-branched polymer.

[0045] As the polycaprolactone-polyether copolymer, one represented by the following general formula (II) or (III) is preferred. [ka] [ka]

[0046] In the above general formulas (II) and (III), R1 to R4 each represent a linear or branched hydrocarbon group having 2 to 20 carbon atoms, which may be substituted with an aliloxy group or an alkoxy group, and R5 is CH2CHCH2, CH3C(CH2)3, or CH3CH2C(CH2)3. l, m, n, o, p, and q each represent an integer of 1 or more.

[0047] In general formulas (II) and (III), l, m, and n are each integers of 1 or more, preferably between 1 and 100, more preferably 3 or more, even more preferably 5 or more, particularly preferably 10 or more, more preferably 90 or less, even more preferably 80 or less, among which 70 or less, 60 or less, 50 or less, 45 or less, 40 or less, and particularly preferably 35 or less. Furthermore, o, p, and q are each integers of 1 or more, preferably between 1 and 100, more preferably 3 or more, even more preferably 5 or more, particularly preferably 10 or more, more preferably 90 or less, even more preferably 80 or less, among which 70 or less, 60 or less, 50 or less, 45 or less, 40 or less, and especially preferably 35 or less.

[0048] As described above, R1 to R4 are linear or branched hydrocarbon groups having 2 to 20 carbon atoms, and may be substituted with an aliloxy group or an alkoxy group. For example, they may have an aromatic ring, such as a 1-phenoxymethyl group. R1 to R4 are preferably the same as R in the ether unit -[RO]- described above. R1 to R4 are preferably alkylene groups selected from the group consisting of 1,2-ethylene group, 1,2-propylene group, trimethylene group, 1,2-butylene group and tetramethylene group. Furthermore, R5 is CH2CHCH2, CH3C(CH2)3, or CH3CH2C(CH2)3, but CH2CHCH2 is particularly preferred. When l, m, and n are 2 or more, R1 to R4 may be the same hydrocarbon group or different hydrocarbon groups.

[0049] The number-average molecular weight (Mn) of the polyether compound (B) is preferably 200 to 10,000, more preferably 300 or more, even more preferably 500 or more, more preferably 5,000 or less, even more preferably 4,000 or less, most preferably 3,000 or less, and particularly preferably 2,500 or less. Having the number-average molecular weight within this range results in excellent compatibility with the aromatic polycarbonate resin (A), and tends to improve transparency and hue. If the number-average molecular weight exceeds the above upper limit, compatibility decreases, and transparency and hue tend to deteriorate, and if the number-average molecular weight falls below the above lower limit, gas is more likely to be generated during molding. The number-average molecular weight (Mn) of polyether compound (B) is calculated based on the hydroxyl value measured in accordance with JIS K1557.

[0050] The content of the polyether compound (B) is 0.01 to 4 parts by mass per 100 parts by mass of the aromatic polycarbonate resin (A). By including this amount together with a predetermined amount of trialkyl phosphite (C), the aromatic polycarbonate resin composition has a good hue, excellent transparency, and excellent heat discoloration resistance. The content is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, even more preferably 0.3 parts by mass or more, even more preferably 0.5 parts by mass or more, preferably 3 parts by mass or less, more preferably 2 parts by mass or less, and even more preferably 1.5 parts by mass or less.

[0051] [Trialkylphosphite (C)] The aromatic polycarbonate resin composition of the present invention contains a trialkylphosphite (C). The trialkylphosphite (C) is preferably a trialkylphosphite represented by the formula P(OR)3. In the formula, R is preferably a substituted or unsubstituted alkyl group having 6 to 30 carbon atoms. Furthermore, the alkyl group of the trialkylphosphite (C) represented above may be a linear or branched alkyl group, and is preferably a branched alkyl group. Examples of alkyl groups having 6 to 30 carbon atoms include n-hexyl group, 2-ethylhexyl group, isohexyl group, heptyl group, octyl group, 3,7-dimethyloctyl group, nonyl group, decyl group, undecyl group, dodecyl group (lauryl group), tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group (stearyl group), nonadecyl group, eicosyl group, eicosyl group, heneicosyl group, heneicosinyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, hexacosyl group, heptacosyl group, octacosyl group, nonacosyl group, and triacontyl group. Examples of groups that can be used include hexyl group, heptyl group, octyl group, nonyl group, decyl group, lauryl group (dodecyl group), tetradecyl group, cetyl group (hexadecyl group), etc., but are not particularly limited. Of these, alkyl groups having 6 to 20 carbon atoms are preferred, alkyl groups having 10 to 20 carbon atoms are more preferred, and nonyl group, decyl group, undecyl group, dodecyl group, hexadecyl group, 2-ethylhexyl group, and octadecyl group (stearyl group) are even more preferred. The trialkylphosphite (C) is preferably one or more selected from the group consisting of tri(2-ethylhexyl)phosphite, trinonylphosphite, tridecylphosphite, tridodecylphosphite, tri(tridecyl)phosphite, triundecylphosphite, and trioctadecylphosphite, with tridecylphosphite being particularly preferred.

[0052] The content of trialkylphosphite (C) is 0.00001 to 0.004 parts by mass per 100 parts by mass of aromatic polycarbonate resin (A). An aromatic polycarbonate resin composition containing such a small amount together with polyether compound (B) has good hue, excellent transparency, and excellent heat discoloration resistance. The content is preferably 0.00003 parts by mass or more, more preferably 0.00005 parts by mass or more, even more preferably 0.00008 parts by mass or more, even more preferably 0.0001 parts by mass or more, preferably 0.0035 parts by mass or less, more preferably 0.003 parts by mass or less, even more preferably 0.002 parts by mass or less, and even more preferably 0.001 parts by mass or less.

[0053] [Aromatic polycarbonate resin (A)] The aromatic polycarbonate resin (A) contained in the resin composition of the present invention is an aromatic polycarbonate resin in which the carbon atoms directly bonded to the carbonate bonds are each aromatic carbon atoms, and is used from the viewpoint of heat resistance, mechanical properties, electrical properties, etc. Aliphatic polycarbonates and polyether polycarbonates having oxyalkylene groups as repeating units are excluded as they are unsuitable from the viewpoint of the above effects.

[0054] Examples of aromatic dihydroxy compounds among the monomers used as raw materials for aromatic polycarbonate resins include: Dihydroxybenzenes such as 1,2-dihydroxybenzene, 1,3-dihydroxybenzene (i.e., resorcinol), and 1,4-dihydroxybenzene; Dihydroxybiphenyls such as 2,5-dihydroxybiphenyl, 2,2'-dihydroxybiphenyl, and 4,4'-dihydroxybiphenyl;

[0055] Dihydroxynaphthalene compounds such as 2,2'-dihydroxy-1,1'-binaphthyl, 1,2-dihydroxynaphthalene, 1,3-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 1,6-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, and 2,7-dihydroxynaphthalene;

[0056] Dihydroxydiaryl ethers such as 2,2'-dihydroxydiphenyl ether, 3,3'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether, 1,4-bis(3-hydroxyphenoxy)benzene, and 1,3-bis(4-hydroxyphenoxy)benzene;

[0057] 2,2-bis(4-hydroxyphenyl)propane (i.e., bisphenol A), 1,1-Bis(4-hydroxyphenyl)propane, 2,2-Bis(3-methyl-4-hydroxyphenyl)propane (i.e., bisphenol C), 2,2-bis(3-methoxy-4-hydroxyphenyl)propane, 2-(4-hydroxyphenyl)-2-(3-methoxy-4-hydroxyphenyl)propane, 1,1-Bis(3-tert-butyl-4-hydroxyphenyl)propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 2,2-Bis(3-cyclohexyl-4-hydroxyphenyl)propane, 2-(4-hydroxyphenyl)-2-(3-cyclohexyl-4-hydroxyphenyl)propane, α,α'-bis(4-hydroxyphenyl)-1,4-diisopropylbenzene, 1,3-bis[2-(4-hydroxyphenyl)-2-propyl]benzene, Bis(4-hydroxyphenyl)methane, Bis(4-hydroxyphenyl)cyclohexylmethane, Bis(4-hydroxyphenyl)phenylmethane, Bis(4-hydroxyphenyl)(4-propenylphenyl)methane, Bis(4-hydroxyphenyl)diphenylmethane, Bis(4-hydroxyphenyl)naphthylmethane, 1,1-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)-1-naphthylethane, 1,1-Bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)pentane, 1,1-Bis(4-hydroxyphenyl)hexane, 2,2-bis(4-hydroxyphenyl)hexane, 1,1-bis(4-hydroxyphenyl)octane, 2,2-bis(4-hydroxyphenyl)octane, 4,4-bis(4-hydroxyphenyl)heptane, 2,2-bis(4-hydroxyphenyl)nonane, 1,1-bis(4-hydroxyphenyl)decane, 1,1-Bis(4-hydroxyphenyl)dodecane, Bis(hydroxyaryl)alkanes such as;

[0058] 1,1-Bis(4-hydroxyphenyl)cyclopentane, 1,1-Bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,4-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,5-dimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1,1-Bis(4-hydroxy-3,5-dimethylphenyl)-3,3,5-trimethylcyclohexane, 1,1-Bis(4-hydroxyphenyl)-3-propyl-5-methylcyclohexane, 1,1-Bis(4-hydroxyphenyl)-3-tert-butyl-cyclohexane, 1,1-Bis(4-hydroxyphenyl)-4-tert-butyl-cyclohexane, 1,1-bis(4-hydroxyphenyl)-3-phenylcyclohexane, 1,1-Bis(4-hydroxyphenyl)-4-phenylcyclohexane, Bis(hydroxyaryl)cycloalkanes such as;

[0059] 9,9-Bis(4-hydroxyphenyl)fluorene, Bisphenols containing cardo structures, such as 9,9-bis(4-hydroxy-3-methylphenyl)fluorene;

[0060] 4,4'-Dihydroxydiphenyl sulfide, Dihydroxydiaryl sulfides such as 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide; Dihydroxydiaryl sulfoxides such as 4,4'-dihydroxydiphenyl sulfoxide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide; 4,4'-Dihydroxydiphenylsulfone, Dihydroxydiarylsulfones such as 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone; These are some examples.

[0061] Among these, bis(hydroxyaryl)alkanes are preferred, and among them, bis(4-hydroxyphenyl)alkanes are preferred, and in particular, 2,2-bis(4-hydroxyphenyl)propane (i.e., bisphenol A) and 2,2-bis(3-methyl-4-hydroxyphenyl)propane (i.e., bisphenol C) are preferred from the viewpoint of impact resistance and heat resistance. Furthermore, one aromatic dihydroxy compound may be used, or two or more may be used in any combination and ratio.

[0062] Among the monomers used as raw materials for aromatic polycarbonate resins, examples of carbonate precursors include carbonyl halides and carbonate esters. Note that one type of carbonate precursor may be used, or two or more types may be used in any combination and ratio.

[0063] Examples of carbonyl halides include, specifically, phosgene; bischloroformates of dihydroxy compounds; monochloroformates of dihydroxy compounds; and other haloformates.

[0064] Examples of carbonate esters include diaryl carbonates such as diphenyl carbonate and dityl carbonate; dialkyl carbonates such as dimethyl carbonate and diethyl carbonate; and carbonates of dihydroxy compounds such as biscarbonates, monocarbonates, and cyclic carbonates of dihydroxy compounds.

[0065] The method for producing the aromatic polycarbonate resin (A) is not particularly limited, and any method can be used. Examples include interfacial polymerization, molten transesterification, pyridine method, ring-opening polymerization of cyclic carbonate compounds, and solid-phase transesterification of prepolymers. Among these, the interfacial polymerization method is particularly preferred.

[0066] In the present invention, the aromatic polycarbonate resin (A) used is preferably one that is encapsulated by a monovalent phenolic hydroxyl group as a terminal inhibitor during polymerization. As the end-stopping agent, alkylphenol compounds are preferred, and the alkyl group preferably has 4 or more carbon atoms, more preferably 12 or fewer, more preferably 10 or fewer, and even more preferably 8 or fewer. The alkyl group may be linear or branched, but branched is preferred. As alkylphenol compounds, p-tert-butylphenol, p-tert-hexylphenol, p-tert-octylphenol, and the like are particularly preferred. Polycarbonate resins with terminals sealed with monofunctional phenols such as alkylphenyl groups are preferable because they allow for high fluidity while maintaining strength and also exhibit good color. While it is common practice to lower the molecular weight of polycarbonate resins to improve fluidity, using aromatic polycarbonate resins with such terminal structures allows for the achievement of high fluidity even when adopting the desired molecular weight without reducing it during material design. This enables good color and fluidity while maintaining high strength and impact resistance.

[0067] The molecular weight of the aromatic polycarbonate resin (A) is preferably 10,000 to 50,000 in viscosity-average molecular weight (Mv), more preferably 10,000 to 40,000, more preferably 10,000 to 30,000 and 10,000 to 26,000, even more preferably 10,500 or more, 11,000 or more, particularly 11,500 or more, most preferably 12,000 or more, even more preferably 24,000 or less, and particularly preferably 20,000 or less. By setting the viscosity-average molecular weight to be above the lower limit of the above range, the mechanical strength of the aromatic polycarbonate resin composition of the present invention can be further improved, and by setting the viscosity-average molecular weight to be below the upper limit of the above range, the decrease in fluidity of the aromatic polycarbonate resin composition of the present invention can be suppressed and improved, thereby improving moldability and facilitating thin-wall molding. Furthermore, two or more aromatic polycarbonate resins with different viscosity-average molecular weights may be mixed and used. In this case, polycarbonate resins whose viscosity-average molecular weight is outside the preferred range described above may also be mixed.

[0068] The viscosity-average molecular weight [Mv] was determined using methylene chloride as the solvent, and the intrinsic viscosity [η] (unit: dl / g) at 25°C was calculated using an Ubbelohde viscometer. Schnell's viscosity formula, i.e., η = 1.23 × 10⁻⁶, was used. -4 Mv 0.83 It refers to the value calculated from [the formula]. In addition, intrinsic viscosity [η] is the specific viscosity [η] at each solution concentration [C] (g / dl). sp This value was calculated by measuring [the value] and using the following formula.

number

[0069] Furthermore, in order to improve the appearance and fluidity of the molded article, the aromatic polycarbonate resin (A) may contain a polycarbonate oligomer. The viscosity-average molecular weight [Mv] of this polycarbonate oligomer is usually 1,500 or more, preferably 2,000 or more, and usually 9,500 or less, preferably 9,000 or less. Moreover, it is preferable that the amount of polycarbonate oligomer contained is 30% by mass or less of the total amount of the aromatic polycarbonate resin and the polycarbonate oligomer.

[0070] Furthermore, the aromatic polycarbonate resin (A) may be not only virgin raw material, but also aromatic polycarbonate resin recycled from used products (so-called material-recycled polycarbonate resin). However, the recycled aromatic polycarbonate resin is preferably 80% by mass or less of the aromatic polycarbonate resin (A), and more preferably 50% by mass or less. This is because recycled aromatic polycarbonate resin is highly likely to have undergone degradation such as thermal degradation or aging degradation, and using more of such aromatic polycarbonate resin than the above range may reduce its hue and mechanical properties.

[0071] [Phosphorus stabilizers other than trialkylphosphite (C) (D)] The aromatic polycarbonate resin composition of the present invention preferably contains a phosphorus-based stabilizer (D) other than trialkylphosphite (C). By containing a phosphorus-based stabilizer (D) other than trialkylphosphite (C), the color of the aromatic polycarbonate resin composition of the present invention becomes better and the heat discoloration resistance is further improved. Any known phosphorus-based stabilizer (D) other than trialkylphosphite (C) can be used. Specific examples include phosphorus oxoacids such as phosphoric acid, phosphonic acid, phosphite, phosphinic acid, and polyphosphate; acidic pyrophosphate metal salts such as sodium acidic pyrophosphate, potassium acidic pyrophosphate, and calcium acidic pyrophosphate; phosphates of Group 1 or Group 2B metals such as potassium phosphate, sodium phosphate, cesium phosphate, and zinc phosphate; phosphate compounds, phosphite compounds, and phosphonite compounds are examples, but phosphite compounds, i.e., phosphorus-based compounds having a phosphite structure, are particularly preferred. By including other phosphite compounds other than trialkylphosphite (C) in combination with trialkylphosphite (C), an aromatic polycarbonate resin composition with higher heat discoloration resistance and continuous productivity can be obtained.

[0072] Phosphite compounds are trivalent phosphorus compounds having a structure represented by the general formula: P(OR)3. However, in phosphite compounds other than trialkylphosphites (C), R represents a monovalent or divalent organic group other than an alkyl group. Examples of such phosphite compounds include triphenyl phosphite, tris(mononylphenyl) phosphite, tris(mononyl / dinonylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, monooctyldiphenyl phosphite, dioctylmonophenyl phosphite, monodecyldiphenyl phosphite, didecylmonophenyl phosphite, distearylpentaerythritol diphosphite, and bis(2,4-di-tert-butyl-4-methylphenyl) Examples include pentaerythritol phosphite, bis(2,6-di-tert-butylphenyl)octyl phosphite, 2,2-methylenebis(4,6-di-tert-butylphenyl)octyl phosphite, tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylene-diphosphite, and 6-[3-(3-tert-butyl-hydroxy-5-methylphenyl)propoxy]-2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]-dioxaphosfepine.

[0073] Among such phosphite compounds, aromatic phosphite compounds represented by the following formulas (1) or (2) are more preferred because they effectively enhance the heat-resistant discoloration of the aromatic polycarbonate resin composition of the present invention.

[0074] [ka] [In formula (1), R 1 , R 2 and R 3 These may be the same or different, and each represents an aryl group with 6 to 30 carbon atoms.

[0075] [ka] [In formula (2), R 4 and R 5 These may be the same or different, and each represents an aryl group with 6 to 30 carbon atoms.

[0076] Among the phosphite compounds represented by the above formula (1), triphenyl phosphite, tris(mononylphenyl) phosphite, and tris(2,4-di-tert-butylphenyl) phosphite are particularly preferred, with tris(2,4-di-tert-butylphenyl) phosphite being more preferred. Specific examples of such organic phosphite compounds include "ADEKA Stab 1178" manufactured by ADEKA, "Sumilyzer TNP" manufactured by Sumitomo Chemical Co., Ltd., "JP-351" manufactured by Johoku Chemical Industry Co., Ltd., "ADEKA Stab 2112" manufactured by ADEKA, "Irgaphos 168" manufactured by BASF, and "JP-650" manufactured by Johoku Chemical Industry Co., Ltd.

[0077] Among the phosphite compounds having a spiro-ring skeleton represented by formula (2) above, those having a pentaerythritol diphosphite structure, such as bis(2,4-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, and bis(2,4-dicumylphenyl)pentaerythritol diphosphite, are particularly preferred. Specific examples of such organic phosphite compounds include, for example, "ADEKA Stab PEP-36" and "ADEKA Stab PEP-24G" manufactured by ADEKA Corporation, and "Doverphos S-9228" manufactured by Doverchemical Corporation.

[0078] Among phosphite compounds, those having a spiro-ring skeleton represented by formula (2) above are more preferred because they exhibit superior hue. The phosphorus-based stabilizer (D) may contain one type, or two or more types in any combination and ratio. It is more preferable that the phosphorus-based stabilizer (D) contains two or more phosphorus compounds having a phosphite structure, one or more of which are phosphite compounds having a spiro-ring skeleton.

[0079] The content of the phosphorus-based stabilizer (D) is preferably 0.005 to 0.5 parts by mass, more preferably 0.007 parts by mass or more, even more preferably 0.008 parts by mass or more, particularly preferably 0.01 parts by mass or more, more preferably 0.4 parts by mass or less, even more preferably 0.3 parts by mass or less, even more preferably 0.2 parts by mass or less, and particularly preferably 0.1 parts by mass or less, per 100 parts by mass of the aromatic polycarbonate resin (A). If the content of the phosphorus-based stabilizer (D) is less than 0.005 parts by mass within the above range, the hue and heat discoloration resistance tend to be insufficient, and if the content of the phosphorus-based stabilizer (D) exceeds 0.5 parts by mass, the heat discoloration resistance tends to worsen, and the moist heat stability also tends to decrease.

[0080] [Epoxy compounds and / or oxetane compounds (E)] The aromatic polycarbonate resin composition of the present invention may also preferably contain an epoxy compound and / or an oxetane compound (E). The inclusion of an epoxy compound and / or an oxetane compound (E) can further improve heat resistance and color change. The content of the epoxy compound and / or oxetane compound (E) is preferably 0.0005 to 0.2 parts by mass per 100 parts by mass of the aromatic polycarbonate resin (A).

[0081] Epoxy compounds used are those having one or more epoxy groups in one molecule. Specifically, these include phenyl glycidyl ether, allyl glycidyl ether, t-butylphenyl glycidyl ether, 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexyl carboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-3',4'-epoxy-6'-methylcyclohexyl carboxylate, 2,3-epoxycyclohexylmethyl-3',4'-epoxycyclohexyl carboxylate, and 4-(3,4-epoxy-5-methylcyclohexyl)butyl-3',4'-epoxy Xycyclohexyl carboxylate, 3,4-epoxycyclohexylethylene oxide, cyclohexylmethyl 3,4-epoxycyclohexyl carboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-6'-methylcyclohexyl carboxylate, bisphenol-A diglycidyl ether, tetrabromobisphenol-A glycidyl ether, diglycidyl ester of phthalate, diglycidyl ester of hexahydrophthalate, bis-epoxydicyclopentadienyl ether, bis-epoxy Diylene glycol, bis-epoxycyclohexyl adipate, butadiene diepoxide, tetraphenylethylene epoxide, octyl epoxytalate, epoxidized polybutadiene, 3,4-dimethyl-1,2-epoxycyclohexane, 3,5-dimethyl-1,2-epoxycyclohexane, 3-methyl-5-t-butyl-1,2-epoxycyclohexane, octadecyl-2,2-dimethyl-3,4-epoxycyclohexyl carboxylate, N-butyl-2,2-dimethyl-3,4-epoxycyclohexyl carboxylate Xylate, cyclohexyl-2-methyl-3,4-epoxycyclohexyl carboxylate, N-butyl-2-isopropyl-3,4-epoxy-5-methylcyclohexyl carboxylate, octadecyl-3,4-epoxycyclohexyl carboxylate, 2-ethylhexyl-3',4'-epoxycyclohexyl carboxylate, 4,6-dimethyl-2,3-epoxycyclohexyl-3',4'-epoxycyclohexyl carboxylate, 4,5-epoxy tetrahydrophthalic anhydride, 3-t-butyl-4,Preferred examples include 5-epoxy tetrahydrophthalic anhydride, diethyl 4,5-epoxy-cis-1,2-cyclohexyl dicarboxylate, di-n-butyl-3-t-butyl-4,5-epoxy-cis-1,2-cyclohexyl dicarboxylate, epoxidized soybean oil, and epoxidized linseed oil.

[0082] Of these, alicyclic epoxy compounds are preferred, and 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexylcarboxylate is particularly preferred.

[0083] Furthermore, polyalkylene glycol derivatives having epoxy groups at one or both ends can also be preferably used. Polyalkylene glycols having epoxy groups at both ends are particularly preferred.

[0084] Examples of polyalkylene glycol derivatives containing epoxy groups in their structure include, for example, polyethylene glycol diglycidyl ether, poly(1-methyl)ethylene glycol diglycidyl ether, poly(2-ethyl)ethylene glycol diglycidyl ether, polytetramethylene glycol diglycidyl ether, polyethylene glycol-poly(1-methyl)ethylene glycol diglycidyl ether, polytetramethylene glycol-poly(2-methyl)ethylene glycol diglycidyl ether, and polytetramethylene glycol-poly(1-ethyl)ethylene glycol diglycidyl ether.

[0085] Epoxy compounds may be used individually or in combination of two or more types.

[0086] The preferred content of the epoxy compound is 0.0005 to 0.2 parts by mass per 100 parts by mass of aromatic polycarbonate resin (A), more preferably 0.001 parts by mass or more, even more preferably 0.003 parts by mass or more, even more preferably 0.005 parts by mass or more, particularly preferably 0.01 parts by mass or more, and more preferably 0.15 parts by mass or less, even more preferably 0.1 parts by mass or less, particularly preferably 0.05 parts by mass or less. If the epoxy compound content is less than 0.0005 parts by mass, the hue and heat discoloration resistance tend to be insufficient, and if it exceeds 0.2 parts by mass, the heat discoloration resistance tends to worsen, and the hue and moist heat stability also tend to decrease.

[0087] Any oxetane compound having one or more oxetane groups in its molecule can be used, including monooxetane compounds having one oxetane group in their molecule and bifunctional or polyoxetane compounds having two or more oxetane groups in their molecule. By including an oxetane compound, it is possible to further improve the good hue and high heat resistance to discoloration.

[0088] Examples of monooxetane compounds include those represented by the following general formulas (3), (4), or (5).

[0089] [ka] [ka] [In formulas (3) to (5), R 1 R is an alkyl group. 2 R represents an alkyl group or a phenyl group. 3 [where n is a divalent organic group which may have an aromatic ring, and n is 0 or 1.]

[0090] In the above general formulas (3), (4), and (5), R 1The group is an alkyl group, preferably an alkyl group having 1 to 6 carbon atoms, and is preferably a methyl group or an ethyl group, and particularly preferably an ethyl group. Also, R 2 R is an alkyl group or a phenyl group, preferably an alkyl group having 2 to 10 carbon atoms, and may be a linear alkyl group, a branched alkyl group or an alicyclic alkyl group, or a linear or branched alkyl group having an ether bond (ether oxygen atom) in the middle of the alkyl chain. 2 Specific examples include ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, 2-ethylhexyl group, nonyl group, decyl group, 3-oxypentyl group, cyclohexyl group, phenyl group, etc. Among these, R 2 The group is preferably a 2-ethylhexyl group, a phenyl group, or a cyclohexyl group.

[0091] Specific examples of compounds of general formula (3) include 3-hydroxymethyl-3-methyloxetane, 3-hydroxymethyl-3-ethyloxetane, 3-hydroxymethyl-3-propyloxetane, and 3-hydroxymethyl-3-n-butyloxetane. Among these, 3-hydroxymethyl-3-methyloxetane and 3-hydroxymethyl-3-ethyloxetane are particularly preferred. Specific examples of compounds of general formula (4) include 3-ethyl-3-(2-ethylhexyloxymethyl)oxetane, which is particularly preferred.

[0092] In general formula (5), R 3This is a divalent organic group that may have an aromatic ring. Examples include linear or branched alkylene groups having 1 to 12 carbon atoms, such as ethylene, propylene, butylene, neopentylene, n-pentamethylene, and n-hexamethylene; phenylene; divalent groups represented by the formula -CH2-Ph-CH2- or -CH2-Ph-Ph-CH2- (where Ph represents the phenyl group); hydrogenated bisphenol A residues, hydrogenated bisphenol F residues, hydrogenated bisphenol Z residues, cyclohexanedimethanol residues, and tricyclodecanedimethanol residues.

[0093] Specific examples of compounds of general formula (5) include bis(3-methyl-3-oxetanylmethyl) ether, bis(3-ethyl-3-oxetanylmethyl) ether, bis(3-propyl-3-oxetanylmethyl) ether, bis(3-butyl-3-oxetanylmethyl) ether, 1,4-bis[(3-ethyl-3-oxetanylmethoxy)methyl]benzene, 3-ethyl-3{[(3-ethyloxetan-3-yl)methoxy]methyl}oxetane, 4,4'-bis[(3-ethyl-3-oxetanyl)methoxymethyl]biphenyl, and 1,4-bis[(3-ethyl-3-oxetanyl)methoxymethyl]benzene, among others, which can be listed as particularly preferred.

[0094] Oxetane compounds may be used alone or in combination of two or more types.

[0095] When an oxetane compound is included, its content is preferably 0.0005 to 0.2 parts by mass, more preferably 0.001 parts by mass or more, even more preferably 0.003 parts by mass or more, even more preferably 0.005 parts by mass or more, particularly preferably 0.01 parts by mass or more, and more preferably 0.15 parts by mass or less, even more preferably 0.1 parts by mass or less, particularly preferably 0.05 parts by mass or less. If the oxetane compound content is less than 0.0005 parts by mass, the hue and heat discoloration resistance tend to be insufficient, and if it exceeds 0.2 parts by mass, the heat discoloration resistance tends to worsen, and gas is more likely to be generated during molding.

[0096] It is also preferable to contain both the epoxy compound and the oxetane compound together, and if both are included, the total content is preferably 0.0005 to 0.2 parts by mass per 100 parts by mass of aromatic polycarbonate resin (A). More preferably 0.001 parts by mass or more, even more preferably 0.003 parts by mass or more, even more preferably 0.005 parts by mass or more, particularly preferably 0.01 parts by mass or more, and also more preferably 0.15 parts by mass or less, even more preferably 0.1 parts by mass or less, particularly preferably 0.05 parts by mass or less.

[0097] [Release agent (F)] The resin composition of the present invention may also preferably contain a mold release agent (F). Examples of release agents (F) include aliphatic carboxylic acids, fatty acid esters (esters of aliphatic carboxylic acids and alcohols), aliphatic hydrocarbon compounds with a number average molecular weight of 200 to 15,000, and polysiloxane-based silicone oils. The number average molecular weight of aliphatic hydrocarbon compounds can be measured by gel permeation chromatography (GPC) using an organic solvent.

[0098] Examples of aliphatic carboxylic acids include saturated or unsaturated aliphatic monovalent, divalent, or trivalent carboxylic acids. Here, aliphatic carboxylic acids also include alicyclic carboxylic acids. Among these, preferred aliphatic carboxylic acids are monovalent or divalent carboxylic acids having 6 to 36 carbon atoms, and more preferably aliphatic saturated monovalent carboxylic acids having 6 to 36 carbon atoms. Specific examples of such aliphatic carboxylic acids include palmitic acid, stearic acid, caproic acid, capric acid, lauric acid, arachidic acid, behenic acid, lignoceric acid, cerotic acid, melissic acid, tetrariacontanoic acid, montanic acid, adipic acid, and azelaic acid.

[0099] As the aliphatic carboxylic acid in the ester of an aliphatic carboxylic acid and an alcohol, for example, the same aliphatic carboxylic acid as described above can be used. On the other hand, as the alcohol, for example, saturated or unsaturated monohydric or polyhydric alcohols can be used. These alcohols may have substituents such as fluorine atoms or aryl groups. Among these, monohydric or polyhydric saturated alcohols having 30 or fewer carbon atoms are preferred, and aliphatic saturated monohydric alcohols or aliphatic saturated polyhydric alcohols having 30 or fewer carbon atoms are more preferred. Here, "aliphatic" is used as a term that also includes alicyclic compounds.

[0100] Specific examples of such alcohols include octanol, decanol, dodecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, pentaerythritol, 2,2-dihydroxyperfluoropropanol, neopentylene glycol, ditrimethylolpropane, and dipentaerythritol.

[0101] Furthermore, the above-mentioned esters may contain aliphatic carboxylic acids and / or alcohols as impurities. Also, the above-mentioned esters may be pure substances or mixtures of multiple compounds. Moreover, the aliphatic carboxylic acids and alcohols that combine to form a single ester may be used individually, or two or more may be used in any combination and ratio.

[0102] Specific examples of esters of aliphatic carboxylic acids and alcohols include beeswax (a mixture mainly composed of myricyl palmitate), stearyl stearate, behenyl behenate, stearyl behenate, glycerin monopalmitate, glycerin monostearate, glycerin distearate, glycerin tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, and pentaerythritol tetrastearate.

[0103] Aliphatic hydrocarbons with a number-average molecular weight of 200 to 15,000 include, for example, liquid paraffin, paraffin wax, microwax, polyethylene wax, Fischer-Tropsch wax, and α-olefin oligomers having 3 to 12 carbon atoms. Note that alicyclic hydrocarbons are also included in the definition of aliphatic hydrocarbons. Furthermore, these hydrocarbons may be partially oxidized. Among these, paraffin wax, polyethylene wax, or partially oxided polyethylene wax are preferred, and paraffin wax and polyethylene wax are more preferred. Furthermore, the number-average molecular weight of the aliphatic hydrocarbon is preferably 5000 or less. Furthermore, while aliphatic hydrocarbons may be single substances, mixtures of substances with varying constituent components and molecular weights can also be used as long as the main component falls within the above-mentioned range.

[0104] Examples of polysiloxane-based silicone oils include dimethyl silicone oil, methylphenyl silicone oil, diphenyl silicone oil, and fluorinated alkyl silicone.

[0105] Furthermore, the above-mentioned release agent may contain one type, or two or more types in any combination and ratio.

[0106] The content of the release agent (F) is usually 0.001 parts by mass or more, preferably 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, per 100 parts by mass of aromatic polycarbonate resin (A), and is also usually 2 parts by mass or less, preferably 1 part by mass or less, more preferably 0.5 parts by mass or less, and particularly preferably 0.1 parts by mass or less. If the content of the release agent is below the lower limit of the above range, the release effect may not be sufficient, and if the content of the release agent exceeds the upper limit of the above range, a decrease in hydrolysis resistance and mold contamination during injection molding may occur. As the release agent (F), fatty acid esters are more preferred because they improve YI and cause less mold contamination. The content of fatty acid esters is preferably 0.005 to 0.5 parts by mass, and particularly preferably 0.01 to 0.1 parts by mass, per 100 parts by mass of aromatic polycarbonate resin (A).

[0107] [Additives, etc.] The aromatic polycarbonate resin composition of the present invention may contain other additives besides those mentioned above, such as antioxidants, ultraviolet absorbers, fluorescent whitening agents, pigments, dyes, polymers other than polycarbonate resin, flame retardants, impact modifiers, antistatic agents, plasticizers, and compatibilizers. These additives may be blended one or more times. It is preferable not to include fluororesins as they tend to impair transparency, and if they are included, it is preferable that the amount is less than 1 part by mass. The aromatic polycarbonate resin composition of the present invention preferably contains 50% by mass or more of aromatic polycarbonate resin (A), more preferably 55% by mass or more, and depending on the application, it may contain 60% by mass or more, 65% by mass or more, 70% by mass or more, 75% by mass or more, 80% by mass or more, or 90% by mass or more, and preferably 99% by mass or less, more preferably 95% by mass or less, even more preferably 90% by mass or less, and even more preferably 85% by mass or less, and depending on the application, it may contain 80% by mass or less, 78% by mass or less, or 75% by mass or less. Furthermore, if other polymers besides aromatic polycarbonate resin (A) are included, their content is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, even more preferably 5 parts by mass or less, and particularly preferably 3 parts by mass or less, per 100 parts by mass of aromatic polycarbonate resin (A).

[0108] [Method for producing aromatic polycarbonate resin composition] There are no limitations on the method for producing the aromatic polycarbonate resin composition of the present invention, and a wide range of known methods for producing aromatic polycarbonate resin compositions can be employed. For example, an aromatic polycarbonate resin (A), a polyether compound (B), and a trialkyl phosphite (C), along with other components that may be added as needed, are pre-mixed using various mixers such as a tumbler or a Henschel mixer, and then melt-kneaded using a mixer such as a Banbury mixer, roll, braver, single-screw extruder, twin-screw extruder, or kneader. The melt-kneading temperature is not particularly limited, but is usually in the range of 240 to 320°C.

[0109] [Aromatic polycarbonate resin composition] The aromatic polycarbonate resin composition of the present invention has excellent hue and therefore excellent YI (degree of yellowing), and the initial YI value at a 300 mm optical path length is preferably 25 or less, more preferably 20 or less, even more preferably 19 or less, most preferably 18 or less, even more preferably 17 or less, most preferably 16 or less, and particularly preferably 15 or less. The YI value was measured using the method described in the examples.

[0110] The aromatic polycarbonate resin composition of the present invention exhibits excellent heat discoloration resistance, and therefore also exhibits excellent YI values ​​after heat treatment (120°C, 1000hr).

[0111] [Optical components] The aromatic polycarbonate resin composition of the present invention can be used to manufacture optical components by molding pellets obtained by pelletizing the above-described aromatic polycarbonate resin composition using various molding methods. Alternatively, optical components can be manufactured by directly molding the resin, which has been melt-kneaded in an extruder, without going through pellets. Examples of various molding methods include injection molding, injection compression molding, extrusion molding, shape extrusion, transfer molding, hollow molding, gas-assisted hollow molding, blow molding, extrusion blow molding, IMC (in-mold coating molding), rotational molding, multilayer molding, two-color molding, insert molding, sandwich molding, foam molding, and pressure molding.

[0112] The aromatic polycarbonate resin composition of the present invention has good hue, excellent transparency, and generates little gas during molding and contaminates the mold, making it suitable for use in injection molding to form optical components, particularly thin-walled optical components that are prone to mold contamination. When forming thin-walled molded bodies such as thin-walled optical components, it is preferable to form the resin composition at a temperature higher than the 260-300°C generally applied to injection molding of polycarbonate resin compositions, with a resin composition temperature of 305-400°C being preferred. A resin composition temperature of 310°C or higher is more preferable, 315°C or higher is even more preferable, 320°C or higher is particularly preferable, and 390°C or lower is even more preferable. When using conventional aromatic polycarbonate resin compositions, there was a problem that yellowing of the molded body was likely to occur when the resin composition temperature during molding was increased to form thin-walled molded bodies. However, by using the resin composition of the present invention, it is possible to manufacture molded bodies with good hue and high transparency, particularly thin-walled optical components, even within the above temperature range. If the resin composition temperature is difficult to measure directly, it is determined as the barrel setting temperature.

[0113] Here, a thin-walled molded body refers to a molded body having a plate-like portion with a wall thickness (thickness) of 1 mm or less, preferably 0.8 mm or less, and more preferably 0.6 mm or less. Here, the plate-like portion may be a flat plate or a curved plate, may have a flat surface or may have irregularities on its surface, and may have an inclined surface or a wedge-shaped cross-section.

[0114] Optical components include parts for equipment and devices that directly or indirectly utilize light sources such as LEDs, organic ELs, incandescent bulbs, fluorescent lamps, and cathode tubes. Specifically, these include headlights (headlamps), taillights, and fog lights for vehicles such as automobiles and motorcycles.

[0115] Furthermore, a typical example of an optical component is a light guide member. A light guide member is a member that has a light source (e.g., LED, organic EL, incandescent bulb, fluorescent lamp, cathode tube, etc., particularly an LED light source) placed on one side or back surface, and directs the light from the light source into the light guide member, causing it to reflect and refract while guiding and / or emitting light. Preferred light guide members include light guide plates, surface light emitting materials, light guide films, light guide sheets, and vehicle light guides (e.g., light guides for automobile lamps), with light guide plates being particularly preferred. Light guide plates can be suitably used in the fields of liquid crystal backlight units, various display devices, and lighting devices, and can be particularly suitably used as high-performance edge-lit type light guide plates. The light guide member preferably has an optical path length of 30 mm or more, and more preferably 50 mm or more.

[0116] Furthermore, the thin-walled molded body described above is preferred as the light guide member, and may be a flat plate or a curved plate, and may have a flat surface or an uneven surface, and the cross-section may have an inclined surface or a wedge shape in which the thickness changes sequentially in the length direction. Examples of light guide films or sheets include those with a thickness of less than 1 mm, preferably 0.8 mm or less, more preferably 0.5 mm or less, even more preferably 0.4 mm or less, and particularly preferably 0.3 mm or less. Examples of light guide plates include those with a thickness of less than 3 mm, preferably 2 mm or less, more preferably 1 mm or less, preferably 0.3 mm or more, and particularly preferably 0.4 mm or more, but are not limited to these. [Examples]

[0117] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples. The raw materials used in the following examples and comparative examples are shown in Table 1.

[0118] [Table 1]

[0119] (Examples 1-18, Comparative Examples 1-4) [Manufacturing of resin composition pellets] Each of the above components was blended in the proportions (parts by mass) shown in Table 2 and below, mixed in a tumbler for 20 minutes, and then melt-kneaded at a cylinder temperature of 240°C using a vented single-screw extruder with a screw diameter of 40 mm (Tanabe Plastic Machinery Co., Ltd. "VS-40"). The mixture was then extruded as strands through the nozzle of the die at the tip of the extruder, and the strands were cut in a pelletizer to obtain pellets.

[0120] [Hue (YI)] The obtained pellets were dried at 120°C for 5 to 7 hours in a hot air circulation dryer, and then long-path molded products (300 mm x 7 mm x 4 mm thick) were molded using an injection molding machine (Sodick "HSP100A") at a resin composition temperature of 340°C and a mold temperature of 80°C. For this long-path molded product, the degree of yellowing (YI) was measured at a path length of 300 mm (initial YI). A long-path spectrophotometer (ASA 1, manufactured by Nippon Denshoku Industries, Ltd., C light source, 2° field of view) was used for the measurement.

[0121] [YI after heating test] To evaluate the heat resistance to discoloration, the long-path molded product (300 mm x 7 mm x 4 mm thick) obtained above was heated at 120°C for 500 hours, and then the YI was measured in the same manner as above.

[0122] The evaluation results are shown in Table 2 and below.

[0123] [Table 2]

[0124] [Table 3]

[0125] [Table 4] [Industrial applicability]

[0126] The aromatic polycarbonate resin composition of the present invention has good hue, excellent transparency, and excellent heat discoloration resistance, making it extremely suitable for use in various molded articles, especially optical components.

Claims

1. An aromatic polycarbonate resin composition characterized by containing 0.01 to 4 parts by mass of a polyether compound (B) and 0.00001 to 0.004 parts by mass of a trialkyl phosphite (C) per 100 parts by mass of an aromatic polycarbonate resin (A).

2. The aromatic polycarbonate resin composition according to claim 1, wherein the alkyl group of the trialkylphosphite (C) is an alkyl group having 6 to 30 carbon atoms.

3. The aromatic polycarbonate resin composition according to claim 1, wherein the polyether compound (B) is a polyether compound represented by the following general formula (I). B １ O-(A １ -O) ａ -X-(A ２ -O) ｂ -B ２ (I) (In formula (I), A １ represents a linear or branched hydrocarbon group having 2 to 6 carbon atoms, and A ２ represents a linear or branched hydrocarbon group having 7 to 20 carbon atoms which may be substituted by an allyloxy group or an alkoxy group, B １ and B ２ each independently represent a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms, and X represents a single bond or a divalent organic group. a represents 0 or an integer of 1 or more, b represents 0 or an integer of 1 or more, and when a or b is 2 or more, each A １ and each A ２ may be the same or different hydrocarbon groups.)

4. A in the above general formula (I) １ The aromatic polycarbonate resin composition according to claim 3, wherein the alkylene group is selected from the group consisting of a 1,2-ethylene group, a 1,2-propylene group, a trimethylene group, a 1,2-butylene group, and a tetramethylene group.

5. The aromatic polycarbonate resin composition according to claim 1, wherein the number average molecular weight (Mn) of the polyether compound (B) is 200 to 10,000.

6. The aromatic polycarbonate resin composition according to claim 1, wherein the viscosity-average molecular weight (Mv) of the aromatic polycarbonate resin (A) is 10,000 to 50,000.

7. Furthermore, the aromatic polycarbonate resin composition according to claim 1, further containing a phosphorus-based stabilizer (D) other than trialkyl phosphite (C) in an amount of 0.005 to 0.5 parts by mass per 100 parts by mass of aromatic polycarbonate resin (A).

8. The aromatic polycarbonate resin composition according to claim 7, wherein the phosphorus-based stabilizer (D) is a phosphorus-based compound having a phosphite structure.

9. The aromatic polycarbonate resin composition according to claim 8, wherein the phosphorus-based stabilizer (D) contains two or more phosphorus-based compounds having a phosphite structure, and one or more of these compounds are phosphite compounds having a spiro-ring skeleton.

10. Furthermore, the aromatic polycarbonate resin composition according to claim 1, further containing 0.0005 to 0.2 parts by mass of an epoxy compound and / or oxetane compound (E) per 100 parts by mass of aromatic polycarbonate resin (A).

11. Furthermore, the aromatic polycarbonate resin composition according to claim 1, further containing 0.005 to 0.5 parts by mass of a fatty acid ester (F) per 100 parts by mass of aromatic polycarbonate resin (A).

12. Pellets comprising the aromatic polycarbonate resin composition according to any one of claims 1 to 11.

13. A molded body obtained by molding the pellets described in claim 12.

14. The molded article according to claim 13, which is an optical component.

15. The optical component according to claim 14, which is a light guide member.

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