Polycarbonate resin composition

Abstract

This polycarbonate resin composition is characterized by containing 0.01 to 4 parts by mass of a polylactone-polyether copolymer (B) per 100 parts by mass of a polycarbonate resin (A).

Description

TECHNICAL FIELD

[0001] The present invention relates to a polycarbonate resin composition, and more particularly, to a polycarbonate resin composition having good hue and excellent transparency, and causing little gas generation and mold contamination during molding, and a molded body of the polycarbonate resin composition. BACKGROUND

[0002] Liquid crystal displays used in PCs and mobile phones, etc. are integrated with a planar light source device to meet the demand for low-profile, lightweight, labor-saving, and high-definition displays. The planar light source device includes a light guide plate having a flat plate shape or a wedge-shaped cross section having a uniformly inclined surface so that incident light can be uniformly and efficiently guided to the liquid crystal display side. Further, the light guide plate can have a concave-convex pattern on its surface in order to impart a light scattering function.

[0003] The light guide plate is obtained by injection molding of a thermoplastic resin, in which the concave-convex pattern is formed by transferring a concave-convex portion formed on the surface of a split mold. The light guide plate has been produced by molding a resin material such as polymethyl methacrylate (PMMA), etc. However, in response to the recent demand for display devices capable of displaying clearer images, polycarbonate resin materials having higher heat resistance are now used because the internal temperature of the device tends to increase due to heat generated near the light source.

[0004] The polycarbonate resin is excellent in mechanical properties, thermal properties, electrical properties, and weather resistance, but has a lower light transmittance than PMMA, etc. Therefore, use of a light guide plate made of a polycarbonate resin with a light source results in a low-brightness planar light source body. Further, polycarbonate resin yellows more easily than PMMA, which is disadvantageous in the recent aspect of requiring the light guide plate to have a small color difference between the light entrance portion and a position away from the light entrance portion.

[0005] To improve the transmittance and hue of the polycarbonate resin, Patent Document 1 proposes adding a polyalkylene glycol consisting of a straight-chain alkyl group to the polycarbonate resin. The addition of polytetramethylene ether glycol results in improved transmittance and yellowness index (YI).

[0006] In particular, recently, optical members such as light guide plates for mobile terminals such as smartphones and tablet terminals are becoming thinner and larger at an extremely fast pace, and such a trend makes it necessary for the light guide plates to be injection molded at high speed and at high barrel temperature. However, such a molding process is prone to cause the progress of increased gas generation and mold contamination during molding. In view of this, the resin composition for this molding process needs not only to have excellent hue (YI) and transparency, but also to cause less gas generation and mold contamination during injection molding at high temperature and to have excellent impact resistance.

[0007] Furthermore, particularly in side-lit light guide plates, there is a need for further improvements in transparency, hue, and resistance to mold contamination, especially as monitors become larger, thinner, and more complex.

[0008] Existing technical documents

[0009] Patent documents

[0010] [Patent Document 1] JP 5699188 B2 Summary of the Invention

[0011] The problem the invention aims to solve

[0012] In view of the above, the object of the present invention is to provide a polycarbonate resin composition that has good hue and excellent transparency, generates very little gas and mold contamination during molding, and has excellent impact resistance.

[0013] Solution for solving the problem

[0014] As a result of in-depth research to achieve the above objectives, the inventors have discovered that adding a specified amount of polylactone-polyether copolymer to polycarbonate resin results in a polycarbonate resin composition with good hue and excellent transparency, causes minimal gas generation and mold contamination during molding, and has excellent impact resistance, thus completing the present invention.

[0015] This invention relates to the polycarbonate resin compositions and molded articles described below.

[0016] 1. A polycarbonate resin composition comprising a polycarbonate resin (A) and a polylactone-polyether copolymer (B) comprising 0.01 to 4 parts by weight of the polycarbonate resin (A) relative to 100 parts by weight.

[0017] 2. The polycarbonate resin composition described in 1 above, wherein the polylactone-polyether copolymer (B) comprises polylactone units and polyether units in a molar ratio of 5:95 to 95:5.

[0018] 3. The polycarbonate resin composition described in 1 or 2 above, wherein the polylactone-polyether copolymer (B) is a polycaprolactone-polyether copolymer.

[0019] 4. The polycarbonate resin composition according to any one of 1 to 3 above, wherein the polycaprolactone-polyether copolymer (B) is a polycaprolactone-polyether copolymer represented by the following general formula (I) or (II):

[0020] [Chemistry 1]

[0021]

[0022] [Chemistry 2]

[0023]

[0024] R1 to R4 are each a straight-chain or branched C that can be substituted with aryloxy or alkoxy groups. 2-20 Hydrocarbon group; R5 is CH2CHCH2, CH3C(CH2)3 or CH3CH2C(CH2)3; a is an integer greater than 3; b and c are each an integer greater than 1; l, m and n are each an integer greater than 1; and o, p and q are each an integer greater than 1.

[0025] 5. The polycarbonate resin composition described in 4 above, wherein R1 to R4 in general formula (I) or (II) are alkylene groups selected from the group consisting of 1,2-ethylene, 1,2-propylene, trimethylene, 1,2-butylene and tetramethylene.

[0026] 6. The polycarbonate resin composition according to any one of 1 to 5 above, wherein the number average molecular weight (Mn) of the polylactone-polyether copolymer (B) is 200 to 10,000.

[0027] 7. The polycarbonate resin composition according to any one of 1 to 6 above, wherein the viscosity-average molecular weight (Mv) of the polycarbonate resin (A) is 10,000 to 50,000.

[0028] 8. The polycarbonate resin composition according to any one of 1 to 7 above further comprises a phosphorus stabilizer (C) in the form of 0.005 to 0.5 parts by weight relative to 100 parts by weight of the polycarbonate resin (A).

[0029] 9. The polycarbonate resin composition described in 8 above, wherein the phosphorus stabilizer (C) comprises a phosphorus compound having a phosphite structure.

[0030] 10. The polycarbonate resin composition described in 8 or 9 above, wherein the phosphorus stabilizer (C) comprises two or more phosphorus compounds having a phosphite structure, at least one of which is a phosphite stabilizer having a spirocyclic skeleton.

[0031] 11. The polycarbonate resin composition of any one of 1 to 10 above further comprises an epoxy compound and / or an oxetane compound (D) in the amount of 0.0005 to 0.2 parts by weight relative to 100 parts by weight of the polycarbonate resin (A).

[0032] 12. The polycarbonate resin composition of any one of 1 to 11 above further comprises a fatty acid ester (E) in the amount of 0.01 to 0.5 parts by weight relative to 100 parts by weight of the polycarbonate resin (A).

[0033] 13. A granule comprising the polycarbonate resin composition of any one of 1 to 12 above.

[0034] 14. A molded article obtained by molding the granules of 13 described above.

[0035] 15. The molded body of 14 above is an optical component.

[0036] The effects of the invention

[0037] The polycarbonate resin composition of the present invention exhibits good hue and excellent transparency, causes minimal gas generation and mold contamination during molding, and possesses excellent impact resistance. Molded articles made from the polycarbonate resin composition of the present invention have excellent hue and good transparency with low YI values, making them particularly suitable for use as optical components. Attached Figure Description

[0038] [ Figure 1 [Illustration 1] is a plan view of the teardrop-shaped mold used to evaluate mold contamination in the embodiments. Detailed Implementation

[0039] The invention is described in detail below by way of embodiments and examples. Unless otherwise stated, the word "to" used herein to indicate a numerical range refers to the lower and upper limits of the range of numbers preceding and following the word.

[0040] The polycarbonate resin composition of the present invention comprises a polycarbonate resin (A) and a polylactone-polyether copolymer (B) comprising 0.01 to 4 parts by weight of the polycarbonate resin (A) relative to 100 parts by weight.

[0041] The following is a detailed description of the components of the polycarbonate resin composition, molded article, etc. according to the present invention.

[0042] Polylactone-polyether copolymer (B)

[0043] The polycarbonate resin composition of the present invention comprises a polylactone-polyether copolymer (B).

[0044] Polylactone-polyether copolymer (B) is a copolymer comprising units derived from a lactone compound and ether units or ether units derived from polyethylene glycol. The copolymer can be a random copolymer or a block copolymer, and is preferably a block copolymer consisting of polylactone blocks and polyether blocks, such that the polylactone is attached to the end of the polyether.

[0045] The molar ratio between polylactone units and polyether units in the polylactone-polyether copolymer (B) is preferably 5:95 to 95:5, more preferably 10:90 to 92:10. More preferably, the molar ratio of polyether units is greater than 50, because the polyether-rich polylactone-polyether copolymer (B) contributes to excellent hue. The molar ratio between polylactone units and polyether units is preferably 10:90 to 45:55, 10:90 to 40:60, or 10:90 to 35:65, and particularly 10:90 to 30:70.

[0046] The molar ratio of the corresponding units in the polylactone-polyether copolymer (B) was measured using a 1H-NMR spectrometer with 1,1,2,2-tetrachloroethylene-d2 as the solvent.

[0047] Examples of lactone compounds include cyclic lactone compounds such as ε-caprolactone, γ-butyrolactone, δ-valerolactone, β-proprolactone, and neovalerolactone. These compounds can be used alone or in combination. ε-caprolactone is particularly preferred among lactone compounds.

[0048] The ether unit can be composed of -[R 1 -O]- indicates that R 1 It is a straight-chain or branched C that can be substituted with aryloxy or alkoxy groups. 2-20 Hydrocarbon group. R 1 It can be substituted with aryloxy or alkoxy groups, and can be a group containing an aromatic ring, such as 1-phenoxymethyl.

[0049] R 1 C is preferred 2-6 Hydrocarbon groups, especially alkylene groups. Straight-chain C 2-6 Examples of hydrocarbon groups include 1,2-ethylene, trimethylene, tetramethylene, pentamethylene, and hexamethylene.

[0050] Branch C 2-6 Examples of hydrocarbon groups include 1,2-propylidene, 1,2-butylidene, 2-methyl(1,2-propylidene), 2,2-dimethyl(1,2-propylidene), 1,2-dimethyl(1,2-propylidene), 1-methyl(1,2-propylidene), 1,2,2-trimethyl(1,2-propylidene), 2-methyl(1,2-butylidene), 1-methyl(1,2-butylidene), 1-isopropylidene(1,2-ethylidene), 2-methyl, 1-isopropylidene(1,2-ethylidene), 1-tert-butyl(1,2-ethylidene), 2-ethyl(1,2-butylidene), 1-ethyl(1,2-butylidene), 1,1-dimethyltrimethylene, 2-methyltetramethylene, and 1-methylpentanediol.

[0051] Among them, R 1Preferably, it is 1,2-ethylene, 1,2-propylene, trimethylene, 1,2-butylene, or tetramethylene, and particularly preferably 1,2-propylene, trimethylene, or tetramethylene.

[0052] R 1 They can be the same or different hydrocarbon groups.

[0053] There are no particular restrictions on the production method of polylactone-polyether copolymer (B), and known methods can be used. For example, it is desirable to use a method in which a lactone compound is ring-opened polymerized and then esterified and copolymerized (block copolymerized) with a polyether diol or epoxide containing ether units.

[0054] Diols or triols can be used for copolymerization.

[0055] Examples of diol compounds include ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 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, neopentanediol, 2-ethyl-2-n-butyl-1,3-propanediol, 2-ethyl-2-hexyl-1,3-propanediol, and cyclohexanediol.

[0056] Examples of triol compounds include glycerol, trimethylolethane, trimethylolpropane, glycerol, pentanetriol, hexanetriol, heptatriol, and octanetriol. Among these, glycerol and trimethylolpropane are preferred.

[0057] When using triol compounds, the resulting polylactone-polyether copolymer (B) is a tribranched polymer.

[0058] The polylactone-polyether copolymer (B) is preferably represented by the following general formula (I) or (II).

[0059] [Chemistry 3]

[0060]

[0061] [Chemistry 4]

[0062]

[0063] In formula (I) or (II), R1 to R4 are each straight-chain or branched C atoms that can be substituted with aryloxy or alkoxy groups. 2-20The hydrocarbon group, and R5 is CH2CHCH2, CH3C(CH2)3, or CH3CH2C(CH2)3. In the formula, a is an integer greater than or equal to 3; b and c are each an integer greater than or equal to 1; l, m, and n are each an integer greater than or equal to 1; and o, p, and q are each an integer greater than or equal to 1.

[0064] In general formula (I) or (II), l, m and n are each an integer of 1 or more, preferably 1 to 100, more preferably 3 or more, even more preferably 5 or more, particularly preferably an integer of 10 or more, and more preferably 90 or less, even more preferably 80 or less, especially 70 or less, 60 or less, 50 or less, 45 or less, or 40 or less, and especially preferably an integer of 35 or less.

[0065] Furthermore, o, p, and q are each an integer of 1 or more, preferably 1 to 100, more preferably 3 or more, even more preferably 5 or more, particularly preferably 10 or more, and more preferably 90 or less, even more preferably 80 or less, especially 70 or less, 60 or less, 50 or less, 45 or less, or 40 or less, and especially preferably 35 or less.

[0066] Furthermore, 'a' is an integer of 3 or more, preferably 3 to 100, more preferably 3 or more, even more preferably 5 or more, particularly preferably 10 or more, and more preferably 90 or less, even more preferably 80 or less, especially 70 or less, 60 or less, 50 or less, 45 or less, or 40 or less, and especially preferably 35 or less. Furthermore, 'b' and 'c' are each an integer of 1 or more, preferably 1 to 100, more preferably 3 or more, even more preferably 5 or more, particularly preferably 10 or more, and more preferably 90 or less, even more preferably 80 or less, especially 70 or less, 60 or less, 50 or less, 45 or less, or 40 or less, and especially preferably 35 or less.

[0067] R1 through R4 are each a straight-chain or branched C that can be substituted with aryloxy or alkoxy groups. 2-20 Hydrocarbon group. Examples include groups containing aromatic rings, such as 1-phenoxymethyl. Preferably, R1 to R4 are combined with the above-mentioned groups composed of [R 1 -O] represents the R of the ether unit. 1 Same. R1 to R3 are preferably alkylene groups selected from 1,2-ethylene, 1,2-propylene, trimethylene, 1,2-butylene and tetramethylene.

[0068] R5 is CH2CHCH2, CH3C(CH2)3, or CH3CH2C(CH2)3, with CH2CHCH2 being particularly preferred. When l, m, and n are 2 or more, R1 to R3 can be the same or different hydrocarbon groups.

[0069] The number-average molecular weight (Mn) of the polylactone-polyether copolymer (B) is preferably from 200 to 10,000, more preferably 300 or more, even more preferably 500 or more, and even more preferably 5,000 or less, and even more preferably 4,500 or less. This range of number-average molecular weight contributes to excellent compatibility with the polycarbonate resin (A) and is unlikely to cause gas generation during molding. If the number-average molecular weight exceeds the upper limit, compatibility tends to decrease. If the number-average molecular weight exceeds the lower limit, gas generation may occur during molding.

[0070] The number-average molecular weight (Mn) of the polylactone-polyether copolymer (B) was calculated based on the hydroxyl value measured according to JIS K1577.

[0071] The polylactone-polyether copolymer (B) is included in an amount of 0.01 to 4 parts by weight relative to 100 parts by weight of polycarbonate resin (A). Polycarbonate resin compositions containing polylactone-polyether copolymer (B) in amounts within this range exhibit good hue and excellent transparency, cause minimal gas generation and mold contamination during molding, and possess excellent impact resistance without suffering a reduction in impact resistance. The content of polylactone-polyether copolymer (B) is preferably 0.05 parts by weight or more, more preferably 0.1 parts by weight or more, even more preferably 0.3 parts by weight or more, and preferably 3 parts by weight or less, more preferably 2 parts by weight or less, and even more preferably 1 part by weight or less. If the content of polylactone-polyether copolymer (B) exceeds the lower or upper limit, the hue of the resulting molded article tends to be worse.

[0072] Polycarbonate resin (A)

[0073] There are no particular limitations on the polycarbonate resin (A) used in this invention, and various polycarbonate resins can be used. Polycarbonate resins can be classified into aromatic polycarbonate resins in which each carbon directly bonded to the carbonate bond is an aromatic carbon, and aliphatic polycarbonate resins in which they are aliphatic carbons. Either of these can be used in this invention. Aromatic polycarbonate resins are preferred as polycarbonate resin (A) in terms of heat resistance, mechanical properties, and electrical properties.

[0074] Monomers used as starting materials for aromatic polycarbonate resins include aromatic dihydroxy compounds. Examples of aromatic dihydroxy compounds include:

[0075] Dihydroxybenzenes, such as 1,2-dihydroxybenzene, 1,3-dihydroxybenzene (i.e., resorcinol) and 1,4-dihydroxybenzene;

[0076] Dihydroxybiphenyls, such as 2,5-dihydroxybiphenyl, 2,2'-dihydroxybiphenyl and 4,4'-dihydroxybiphenyl;

[0077] Dihydroxynaphthalenes, 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;

[0078] Dihydroxy diaryl ethers, such as 2,2'-dihydroxy diphenyl ether, 3,3'-dihydroxy diphenyl ether, 4,4'-dihydroxy diphenyl ether, 4,4'-dihydroxy-3,3'-dimethyl diphenyl ether, 1,4-bis(3-hydroxyphenoxy)benzene and 1,3-bis(4-hydroxyphenoxy)benzene;

[0079] Di(hydroxyaryl)alkanes, for example

[0080] 2,2-Bis(4-hydroxyphenyl)propane (i.e., bisphenol A),

[0081] 1,1-bis(4-hydroxyphenyl)propane,

[0082] 2,2-Bis(3-methyl-4-hydroxyphenyl)propane (i.e., bisphenol C),

[0083] 2,2-bis(3-methoxy-4-hydroxyphenyl)propane,

[0084] 2-(4-hydroxyphenyl)-2-(3-methoxy-4-hydroxyphenyl)propane,

[0085] 1,1-Bis(3-tert-butyl-4-hydroxyphenyl)propane,

[0086] 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane,

[0087] 2,2-Bis(3-cyclohexyl-4-hydroxyphenyl)propane,

[0088] 2-(4-hydroxyphenyl)-2-(3-cyclohexyl-4-hydroxyphenyl)propane,

[0089] α,α'-bis(4-hydroxyphenyl)-1,4-diisopropylbenzene,

[0090] 1,3-Bis[2-(4-hydroxyphenyl)-2-propyl]benzene,

[0091] bis(4-hydroxyphenyl)methane,

[0092] bis(4-hydroxyphenyl)cyclohexylmethane,

[0093] bis(4-hydroxyphenyl)phenylmethane,

[0094] bis(4-hydroxyphenyl)(4-propenylphenyl)methane,

[0095] bis(4-hydroxyphenyl)diphenylmethane,

[0096] bis(4-hydroxyphenyl)naphthylmethane,

[0097] 1,1-bis(4-hydroxyphenyl)ethane,

[0098] 1,1-Bis(4-hydroxyphenyl)-1-phenylethane,

[0099] 1,1-Bis(4-hydroxyphenyl)-1-naphthylethane,

[0100] 1,1-Bis(4-hydroxyphenyl)butane,

[0101] 2,2-bis(4-hydroxyphenyl)butane,

[0102] 2,2-bis(4-hydroxyphenyl)pentane,

[0103] 1,1-bis(4-hydroxyphenyl)hexane,

[0104] 2,2-bis(4-hydroxyphenyl)hexane,

[0105] 1,1-Bis(4-hydroxyphenyl)octane,

[0106] 2,2-bis(4-hydroxyphenyl)octane,

[0107] 4,4-bis(4-hydroxyphenyl)heptane,

[0108] 2,2-bis(4-hydroxyphenyl)nonane,

[0109] 1,1-bis(4-hydroxyphenyl)decane, and

[0110] 1,1-Bis(4-hydroxyphenyl)dodecane;

[0111] Bis(hydroxyaryl)cycloalkanes, for example

[0112] 1,1-Bis(4-hydroxyphenyl)cyclopentane,

[0113] 1,1-Bis(4-hydroxyphenyl)cyclohexane,

[0114] 1,1-Bis(4-hydroxyphenyl)-3,3-dimethylcyclohexane,

[0115] 1,1-Bis(4-hydroxyphenyl)-3,4-dimethylcyclohexane,

[0116] 1,1-Bis(4-hydroxyphenyl)-3,5-dimethylcyclohexane,

[0117] 1,1-Bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane,

[0118] 1,1-Bis(4-hydroxy-3,5-dimethylphenyl)-3,3,5-trimethylcyclohexane,

[0119] 1,1-Bis(4-hydroxyphenyl)-3-propyl-5-methylcyclohexane,

[0120] 1,1-Bis(4-hydroxyphenyl)-3-tert-butylcyclohexane,

[0121] 1,1-Bis(4-hydroxyphenyl)-4-tert-butylcyclohexane,

[0122] 1,1-bis(4-hydroxyphenyl)-3-phenylcyclohexane, and

[0123] 1,1-Bis(4-hydroxyphenyl)-4-phenylcyclohexane;

[0124] Bisphenols containing the Cardo structure, such as

[0125] 9,9-bis(4-hydroxyphenyl)fluorene and

[0126] 9,9-Bis(4-hydroxy-3-methylphenyl)fluorene;

[0127] Dihydroxydiaryl sulfides, for example

[0128] 4,4'-Dihydroxydiphenyl sulfide and

[0129] 4,4'-Dihydroxy-3,3'-Dimethyl diphenyl sulfide;

[0130] Dihydroxydiaryl sulfoxides, such as 4,4'-dihydroxydiphenyl sulfoxide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide; and

[0131] Dihydroxydiaryl sulfones, for example

[0132] 4,4'-Dihydroxydiphenyl sulfone and

[0133] 4,4'-Dihydroxy-3,3'-Dimethyldiphenylsulfone.

[0134] Bis(hydroxyaryl)alkanes are preferred, and bis(4-hydroxyphenyl)alkanes are more preferred. From the viewpoint of impact resistance and heat resistance, 2,2-bis(4-hydroxyphenyl)propane (i.e., bisphenol A) and 2,2-bis(3-methyl-4-hydroxyphenyl)propane (i.e., bisphenol C) are particularly preferred.

[0135] These aromatic dihydroxy compounds can be used alone or in combination of two or more in any proportion.

[0136] Monomers used as starting materials for polycarbonate resins include carbonate precursors. Examples of carbonate precursors include carbonyl halides and carbonates. Carbonate precursors can be used alone or in combination of two or more in any proportion.

[0137] Specific examples of carbonyl halides include phosgene; and halocarbamates, such as dichlorocarbamates and monochlorocarbamates of dihydroxy compounds.

[0138] Specific examples of carbonates include:

[0139] Diaryl carbonates, such as diphenyl carbonate and xylyl carbonate; dialkyl carbonates, such as dimethyl carbonate and diethyl carbonate; and carbonates of dihydroxy compounds, such as dihydroxy compound dicarbonates, dihydroxy compound monocarbonates and cyclic carbonates.

[0140] There are no particular limitations on the production method of polycarbonate resin (A), and any method can be used. Examples include interfacial polymerization, melt transesterification, pyridine process, ring-opening polymerization of cyclic carbonate compounds, and solid-phase transesterification of prepolymers. Among these, interfacial polymerization and melt transesterification are preferred for effectively achieving improved resistance to damp heat, with interfacial polymerization being particularly preferred.

[0141] A polycarbonate resin having an end structure represented by the following formula (1) can be used as part or all of the polycarbonate resin (A) used in this invention.

[0142] [Chemistry 5]

[0143]

[0144] In equation (1), n ​​is an integer of 0 or 1, and R 1 It is C 4-14 Alkyl groups. Polycarbonate resins with the terminal structure of formula (1) can achieve high flowability while maintaining their strength, even when they have the desired molecular weight (i.e., without needing to reduce the molecular weight). Therefore, this polycarbonate resin exhibits high impact resistance even at low temperatures.

[0145] As R 1 The alkyl group preferably has 4 or 6 or more carbon atoms, and more preferably has 12 or fewer carbon atoms, and more preferably has 10 or fewer carbon atoms. As R 1 The alkyl group can be straight-chain or branched.

[0146] Among them, R 1Preferably, it is selected from one or more of the group consisting of tert-butyl, n-octyl, isooctyl and tert-octyl, and more preferably tert-butyl or tert-octyl. Preferably, the terminal structure of formula (1) is tert-octylphenyl (i.e., 1,1,3,3-tetramethylbutylphenyl).

[0147] In formula (1), the -(O) bonded to the phenyl group n R 1 The group can be in the ortho, meta, or para position, and is preferably in the para position as shown in formula (1').

[0148] [Chemistry 6]

[0149]

[0150] R in equation (1) or (1') 1 Preferred specific examples of the group include: p-tert-butyl; alkylphenyl, such as p-pentylphenyl, p-hexylphenyl, p-heptylphenyl, p-n-octylphenyl, p-isooctylphenyl, p-tert-octylphenyl, p-dodecylphenyl, p-tetradecylphenyl, p-nonylphenol, p-dodecylphenol, pentylphenol, hexylphenol, hepylphenol, octylphenol, nonylphenol, decylphenol, dodecylphenol and myristylphenol; and alkoxyphenyl, such as p-hexoxyphenyl, p-n-octyloxyphenyl, p-isooctyloxyphenyl, p-tert-octyloxyphenyl and p-dodecyloxyphenyl.

[0151] Wherein, R in equation (1) or (1') 1 The group is preferably p-tert-butyl, n-octyl, isooctyl, or tert-octyl, more preferably p-tert-butyl, p-n-octyl, p-isooctyl, or p-tert-octyl. In particular, p-tert-octyl is preferred for achieving high flowability, which contributes to high impact resistance and low-temperature impact resistance.

[0152] The content of polycarbonate resin (if included) having the end structure of formula (1) is preferably 40% by mass or more, and even more preferably 100% by mass, relative to 100% by mass of all polycarbonate resin (A).

[0153] The molecular weight of the polycarbonate resin (A), expressed as the viscosity-average molecular weight (Mv) converted from the solution viscosity measured at 25°C using dichloromethane as a solvent, is preferably 10,000 to 50,000, more preferably 10,000 to 40,000, even more preferably 10,000 to 30,000 or 10,000 to 26,000, and preferably 10,500 or more or 11,000 or more, particularly preferably 11,500 or more, and most preferably 12,000 or more, and preferably 24,000 or less, and particularly preferably 20,000 or less. A viscosity-average molecular weight not lower than the lower limit of the above range allows for further improvement of the mechanical strength of the polycarbonate resin composition of the present invention. A viscosity-average molecular weight not higher than the upper limit of the above range allows for improvement of the polycarbonate resin composition of the present invention by suppressing a decrease in flowability, resulting in increased processability and facilitating molding processes.

[0154] A mixture of two or more polycarbonate resins with different viscosity-average molecular weights can be used, in which case the mixture may contain polycarbonate resins with viscosity-average molecular weights outside the preferred range described above.

[0155] Viscosity-average molecular weight [Mv] refers to the value calculated using the Schnell viscosity equation, i.e., η = 1.23 × 10⁻⁶. -4 Mv 0.83 Where [η] is the intrinsic viscosity (unit: dl / g) measured using an Ubbelohde viscometer with dichloromethane as the solvent at 25°C. The intrinsic viscosity [η] is the specific viscosity [η] measured at various solution concentrations [C] (g / dl). sp The value is calculated according to the following formula.

[0156] [Number.1]

[0157]

[0158] To improve the appearance and flowability of the molded article, the polycarbonate resin (A) may contain polycarbonate oligomers. The viscosity-average molecular weight [Mv] of the polycarbonate oligomers is typically 1,500 or more, preferably 2,000 or more, and typically 9,500 or less, preferably 9,000 or less. The content of the polycarbonate oligomers is preferably 30% by mass or less of the polycarbonate resin (including the polycarbonate oligomers).

[0159] The polycarbonate resin (A) can be produced not only from virgin starting materials, but also from polycarbonate resin recycled from post-consumer products (also known as material-recycled polycarbonate resin), and preferably may contain both virgin starting materials and recycled resin, or may consist of recycled polycarbonate resin. The proportion of recycled polycarbonate resin (if used) in polycarbonate resin (A) is preferably 5% or more.

[0160] Phosphorus-based stabilizers (C)

[0161] The polycarbonate resin composition of the present invention preferably contains a phosphorus-based stabilizer (C). The phosphorus-based stabilizer contained in the polycarbonate resin composition of the present invention is used to improve hue and heat resistance to discoloration.

[0162] Any known phosphorus-based stabilizer can be used. Specific examples include: phosphoric oxyacids, such as phosphoric acid, phosphonic acid, phosphorous acid, hypophosphite, and polyphosphoric acid; acidic metal pyrophosphates, such as sodium acid pyrophosphate, potassium acid pyrophosphate, and calcium acid pyrophosphate; phosphates of Group 1 or Group 2B metals, such as potassium phosphate, sodium phosphate, cesium phosphate, and zinc phosphate; phosphate ester compounds; phosphite compounds; and phosphonite compounds. Among these, compounds having a phosphite structure are particularly preferred. When phosphite compounds are selected, the resulting polycarbonate resin composition can achieve higher colorfastness and ensure continuous production.

[0163] The phosphite compounds here are trivalent phosphorus compounds having a structure represented by the following general formula: P(OR)3, where R is a monovalent or divalent organic group.

[0164] Examples of such phosphite compounds include triphenyl phosphite, tris(mononophenyl) phosphite, tris(monono / dinonophenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, monooctyl diphenyl phosphite, dioctyl monophenyl phosphite, monodecyl diphenyl phosphite, didecyl monophenyl phosphite, tridecyl phosphite, trilauryl phosphite, tripearyl phosphite, distearate pentaerythritol diphosphite, and bis(2,4-di-tert-butyl-4-methylphenyl) Pentaerythritol phosphite, bis(2,6-di-tert-butylphenyl)octyl phosphite, 2,2-methylene bis(4,6-di-tert-butylphenyl)octyl phosphite, tetra(2,4-di-tert-butylphenyl)-4,4'-biphenyl-diphosphite, and 6-[3-(3-tert-butyl-hydroxy-5-methylphenyl)propoxy]-2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]-dioxaphosphepine.

[0165] Among them, aromatic phosphite compounds represented by the following formulas (1) and (2) are more preferred in terms of effectively increasing the heat resistance and colorfastness of the polycarbonate resin composition of the present invention.

[0166] [Chemistry 7]

[0167]

[0168] In equation (1), R 1 R 2 and R 3 They can be the same or different and each is C. 6-30 Aryl.

[0169] [Chemistry 8]

[0170]

[0171] In equation (2), R 4 and R 5 They can be the same or different and each is C. 6-30 Aryl.

[0172] Among the phosphite compounds represented by formula (1), triphenyl phosphite, tris(mononylphenyl) phosphite, and tris(2,4-di-tert-butylphenyl) phosphite are preferred, with tris(2,4-di-tert-butylphenyl) phosphite being more preferred. Specific examples of these organophosphite compounds include “ADK STAB1178” manufactured by ADEKA Corporation, “SUMILIZER TNP” manufactured by Sumitomo Chemical Co., Ltd., “JP-351” manufactured by Johoku Chemical Co., Ltd., “ADK STAB 2112” manufactured by ADEKA Corporation, “Irgafos 168” manufactured by BASF, and “JP-650” manufactured by Johoku Chemical Co., Ltd.

[0173] Among the phosphite compounds represented by formula (2), those having a pentaerythritol diphosphite structure are particularly preferred, 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. Preferred specific examples of these organophosphite compounds include “ADK STAB PEP-36” and “ADKSTAB PEP-24G” manufactured by ADEKA Corporation and “Doverphos S-9228” manufactured by Dover Chemical Corporation.

[0174] Among phosphite compounds, aromatic phosphite compounds represented by formula (2) are more preferred in terms of achieving a superior hue.

[0175] These phosphorus-based stabilizers can be used alone or in combination of two or more in any proportion.

[0176] The content of phosphorus stabilizer (C) relative to 100 parts by weight of polycarbonate resin (A) is preferably 0.005 to 0.5 parts by weight, more preferably 0.007 parts by weight or more, even more preferably 0.008 parts by weight or more, particularly preferably 0.01 parts by weight or more, and more preferably 0.4 parts by weight or less, even more preferably 0.3 parts by weight or less, particularly 0.2 parts by weight or less, and especially 0.1 parts by weight or less. If the content of phosphorus stabilizer (C) is less than 0.005 parts by weight, the hue and heat discoloration resistance of the resulting polycarbonate resin composition tend to be insufficient. If the content of phosphorus stabilizer (C) is greater than 0.5 parts by weight, the heat discoloration resistance may deteriorate rather than improve, and the hygrothermal stability also tends to decrease.

[0177] Epoxides and / or oxetanes (D)

[0178] The resin composition of the present invention preferably also contains an epoxy compound and / or an oxetine compound (D). Resin compositions containing an epoxy compound and / or an oxetine compound (D) can exhibit further improved heat resistance and colorfastness. The content of the epoxy compound and / or an oxetine compound (D) is preferably 0.0005 to 0.2 parts by weight relative to 100 parts by weight of polycarbonate resin (A).

[0179] The epoxy compounds used in this invention have one or more epoxy groups in one molecule. Preferred specific examples include: phenyl glycidyl ether, allyl glycidyl ether, tert-butylphenyl glycidyl ether, 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexylcarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-3',4'-epoxy-6'-methylcyclohexylcarboxylate, 2,3-epoxycyclohexylmethyl-3',4'-epoxycyclohexylcarboxylate, 4-(3,4-epoxy-5-methylcyclohexyl)butyl-3',4'-epoxycyclohexylcarboxylate, 3, 4-Epoxycyclohexylethylene oxide, cyclohexylmethyl 3,4-epoxycyclohexylcarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-6'-methylcyclohexylcarboxylate, bisphenol A diglycidyl ether, tetrabromobisphenol A glycidyl ether, diglycidyl phthalate, hexahydrophthalate diglycidyl ether, diepoxydicyclopentadienyl ether, diepoxyethylene glycol, diepoxycyclohexyl adipate, butadiene diepoxide, tetraphenylethylene epoxide, octyl epoxy tall oleate tallate), epoxidized polybutadiene, 3,4-dimethyl-1,2-epoxycyclohexane, 3,5-dimethyl-1,2-epoxycyclohexane, 3-methyl-5-tert-butyl-1,2-epoxycyclohexane, octadecyl-2,2-dimethyl-3,4-epoxycyclohexylcarboxylate, N-butyl-2,2-dimethyl-3,4-epoxycyclohexylcarboxylate, cyclohexyl-2-methyl-3,4-epoxycyclohexylcarboxylate, N-butyl-2-isopropyl-3,4-epoxy-5-methylcyclohexylcarboxylate, octadecyl Alkyl-3,4-epoxycyclohexylcarboxylate, 2-ethylhexyl-3',4'-epoxycyclohexylcarboxylate, 4,6-dimethyl-2,3-epoxycyclohexyl-3',4'-epoxycyclohexylcarboxylate, 4,5-epoxytetrahydrophthalic anhydride, 3-tert-butyl-4,5-epoxytetrahydrophthalic anhydride, diethyl-4,5-epoxy-cis-1,2-cyclohexyldicarboxylate, di-n-butyl-3-tert-butyl-4,5-epoxy-cis-1,2-cyclohexyldicarboxylate, epoxidized soybean oil, and epoxidized linseed oil.

[0180] Alicyclic epoxy compounds are preferred, and 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexylcarboxylic acid ester is particularly preferred.

[0181] Furthermore, polyalkylene glycol derivatives having epoxy groups at one or both ends may also be preferred, and polyalkylene glycols having epoxy groups at both ends are particularly preferred.

[0182] Preferred examples of polyalkylene glycol derivatives having epoxy groups in their structure include: 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.

[0183] These epoxy compounds can be used alone or in combination of two or more.

[0184] The content of the epoxy compound relative to 100 parts by weight of polycarbonate resin (A) is preferably 0.0005 to 0.2 parts by weight, more preferably 0.001 parts by weight or more, even more preferably 0.003 parts by weight or more, particularly preferably 0.005 parts by weight or more, and more preferably 0.15 parts by weight or less, even more preferably 0.1 parts by weight or less, and particularly preferably 0.05 parts by weight or less. If the content of epoxy resin is less than 0.0005 parts by weight, the hue and heat resistance of the resulting polycarbonate resin composition tend to be insufficient. If the content is greater than 0.2 parts by weight, the heat resistance may deteriorate rather than improve, and the hue and hygrothermal stability also tend to decrease.

[0185] The oxetane compound used in this invention can be any compound having one or more oxetane groups in the molecule, such as monooxetane compounds having one oxetane group in the molecule and polyoxetane compounds having two or more oxetane groups in the molecule that are more than two-functional.

[0186] The included oxobutane compounds are used to further improve the good hue and high heat resistance to discoloration.

[0187] Preferred examples of monooxane compounds include those represented by the following general formulas (3), (4) and (5).

[0188] [Chemistry 9]

[0189]

[0190] [Chemistry 10]

[0191]

[0192] In equations (3) to (5), R 1 It is an alkyl group; R 2 It is an alkyl or phenyl group; R 3 It can be a divalent organic group that has an aromatic ring; and n is 0 or 1.

[0193] In general formulas (3), (4) and (5), R 1 It is an alkyl group, preferably C10. 1-6 Alkyl groups, such as methyl or ethyl, with ethyl being particularly preferred.

[0194] R 2 It is an alkyl or phenyl group, preferably C10. 2-10 Alkyl groups, which can be chain-like, branched, or alicyclic alkyl groups, or chain-like or branched alkyl groups with an ether bond (oxygen atom in the ether bond) in the middle of the alkyl chain. R 2 Specific examples include ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, 2-ethylhexyl, nonyl, decyl, 3-oxopentyl, cyclohexyl, and phenyl. Among them, R... 2 Preferably, it is 2-ethylhexyl, phenyl, or cyclohexyl.

[0195] Preferred specific examples of compounds of general formula (3) include 3-hydroxymethyl-3-methyloxetane, 3-hydroxymethyl-3-ethyloxetane, 3-hydroxymethyl-3-propyloxetane, 3-hydroxymethyl-3-n-butyloxetane, and 3-hydroxymethyl-3-propyloxetane. Among them, 3-hydroxymethyl-3-methyloxetane and 3-hydroxymethyl-3-ethyloxetane are particularly preferred.

[0196] Specific examples of particularly preferred compounds of general formula (4) include 3-ethyl-3-(2-ethylhexyloxymethyl)oxetane.

[0197] In general formula (5), R 3 It can be a divalent organic group that has an aromatic ring. Examples include: C 1-12 Straight-chain or branched alkylene groups, such as ethylene, propyleneene, butylene, neopentylene, pentamethylene, and hexamethylene; phenylene; divalent groups represented by the following formula: -CH 2 -Ph-CH 2 -and-CH 2 -Ph-Ph-CH 2 - (where Ph is phenyl); hydrogenated bisphenol A residue; hydrogenated bisphenol F residue; hydrogenated bisphenol Z residue; cyclohexanediethanol residue; and tricyclodecanediethanol residue.

[0198] Particularly preferred examples of compounds of general formula (5) include bis(3-methyl-3-oxetanebutylmethyl) ether, bis(3-ethyl-3-oxetanebutylmethyl) ether, bis(3-propyl-3-oxetanebutylmethyl) ether, bis(3-butyl-3-oxetanebutylmethyl) ether, 1,4-bis[(3-ethyl-3-oxetanebutylmethoxy)methyl]benzene, 3-ethyl-3{[(3-ethyloxetane-3-yl)methoxy]methyl}oxetane, 4,4'-bis[(3-ethyl-3-oxetanebutyl)methoxymethyl]biphenyl and 1,4-bis[(3-ethyl-3-oxetanebutyl)methoxymethyl]benzene.

[0199] These oxobutane compounds can be used alone or in combination of two or more.

[0200] The content of the oxetane compound (if included) relative to 100 parts by weight of polycarbonate resin (A) is preferably 0.0005 to 0.2 parts by weight, more preferably 0.001 parts by weight or more, even more preferably 0.003 parts by weight or more, particularly preferably 0.005 parts by weight or more, and more preferably 0.15 parts by weight or less, even more preferably 0.1 parts by weight or less, and particularly preferably 0.05 parts by weight or less. If the content of the oxetane compound is less than 0.0005 parts by weight, the hue and heat discoloration resistance of the resulting polycarbonate resin composition tend to be insufficient. If the content is greater than 0.2 parts by weight, the heat discoloration resistance may deteriorate rather than improve, and gas generation tends to occur during molding.

[0201] Preferably, the resin composition comprises both an epoxy compound and an oxetine compound, wherein the total content of these compounds is preferably 0.0005 to 0.2 parts by weight relative to 100 parts by weight of polycarbonate resin (A).

[0202] Fatty acid esters (E)

[0203] The resin composition of the present invention preferably contains fatty acid esters (E). The contained fatty acid esters (E) are used to improve hue.

[0204] Fatty acid esters (E) are esters of aliphatic carboxylic acids and alcohols.

[0205] In aliphatic carboxylic acid-alcohol esters, the aliphatic carboxylic acid can be, for example, a saturated or unsaturated monovalent, divalent, or trivalent aliphatic carboxylic acid. As used herein, aliphatic carboxylic acids include alicyclic carboxylic acids. Preferably, the aliphatic carboxylic acid is C14. 6-36 Monovalent or divalent carboxylic acids, more preferably C 6-36Saturated monovalent aliphatic carboxylic acids. Specific examples of these aliphatic carboxylic acids include palmitic acid, stearic acid, hexanoic acid, decanoic acid, lauric acid, arachidic acid, behenic acid, tetracosanoic acid, ceric acid, beeswax acid, tritetracosanoic acid, linalic acid, adipic acid, and azelaic acid.

[0206] In aliphatic carboxylic acid-alcohol esters, the alcohol can be, for example, a saturated or unsaturated mono- or poly-alcohol. The alcohol may have substituents, such as fluorine atoms or aryl groups. Preferably, the alcohol is a saturated mono- or poly-alcohol with no more than 30 carbon atoms, more preferably a saturated mono- or poly-aliphatic alcohol with no more than 30 carbon atoms. As used herein, the term aliphatic includes alicyclic compounds.

[0207] Specific examples of these alcohols include octanol, decanol, dodecylol, stearyl alcohol, behenol, ethylene glycol, diethylene glycol, glycerol, pentaerythritol, 2,2-dihydroxyperfluoropropanol, neopentyl glycol, bis(trimethylolpropane) and dipentaerythritol.

[0208] Esters may contain aliphatic carboxylic acids and / or alcohols as impurities. Furthermore, esters can be single compounds or mixtures of multiple compounds. These aliphatic carboxylic acids and alcohols bonded together to form the ester can be used individually or in any combination of two or more in any proportion.

[0209] Specific examples of aliphatic carboxylic acid-alcohol esters include beeswax (a mixture mainly composed of melissylpalmitate), stearate, behenate, stearate monopalmitate, glyceryl monostearate, glyceryl distearate, glyceryl tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, and pentaerythritol tetrastearate.

[0210] The content of fatty acid ester (E) is preferably 0.01 to 0.5 parts by weight relative to 100 parts by weight of polycarbonate resin (A).

[0211] Additives, etc.

[0212] The polycarbonate resin composition of the present invention may contain additives other than those described above, such as antioxidants, ultraviolet absorbers, fluorescent whitening agents, pigments, dyes, polymers other than polycarbonate resins, flame retardants, impact enhancers, antistatic agents, plasticizers, and compatibilizers. These additives may be used alone or in combination of two or more.

[0213] The content of polymers other than polycarbonate resin (A), if included, is preferably 20 parts by weight or less, more preferably 10 parts by weight or less, even more preferably 5 parts by weight or less, and particularly preferably 3 parts by weight or less, relative to 100 parts by weight of polycarbonate resin (A).

[0214] Method for producing polycarbonate resin compositions

[0215] The production method of the polycarbonate resin composition of the present invention is not particularly limited, and widely known methods can be used. For example, the necessary components described above and other suitable blending components are premixed together using various mixers, such as tumblers and Henschel mixers, and then melt-blended using mixers such as Banbury mixers, roller mixers, Brabender mixers, single-screw extruders, twin-screw extruders, or kneaders. The melt-blending temperature is not particularly limited and is generally in the range of 240°C to 320°C.

[0216] polycarbonate resin composition

[0217] The polycarbonate resin composition of the present invention has an excellent hue and therefore an excellent YI (yellowness index). The initial YI value at a light path length of 300 mm is preferably 23 or less, more preferably 22 or less, 21.5 or less, or 21 or less, and even more preferably 20.5 or less.

[0218] The initial YI value was measured using light source C and a 2° field of view on a long optical path product (300mm×7mm×4mm) formed at a resin temperature of 340℃ and a mold temperature of 80℃, with a optical path length of 300mm.

[0219] Optical components

[0220] The polycarbonate resin compositions of the present invention are granulated into pellets, which can then be formed into optical components by various forming methods. Alternatively, the polycarbonate resin compositions melt-blended in an extruder can be directly formed into optical components (i.e., without forming pellets).

[0221] The polycarbonate resin composition of the present invention exhibits excellent flowability and hue, and causes minimal gas generation and mold contamination during molding. Therefore, it is suitable for injection molding into optical components, particularly thin optical components that tend to involve mold contamination. During injection molding, especially into thin molded bodies, the resin temperature is preferably higher than the temperature range typically used for injection molding of polycarbonate resins (260°C to 300°C). More specifically, the resin temperature is preferably 305°C to 400°C, more preferably above 310°C, even more preferably above 315°C, particularly preferably above 320°C, and more preferably below 390°C. When conventional polycarbonate resin compositions are molded to form thin molded bodies at elevated resin temperatures, the resulting molded bodies tend to yellow. However, the resin composition of the present invention allows for the production of molded bodies with good hue and high transparency, particularly thin optical components, even when molded within the aforementioned temperature range.

[0222] If it is difficult to measure the resin temperature directly, the set temperature of the cylinder can be used as the resin temperature.

[0223] As used herein, a thin-formed body refers to a formed body having a plate-like portion with a thickness typically less than 1 mm, preferably less than 0.8 mm, and more preferably less than 0.6 mm. The plate-like portion may be flat or curved, and may have a surface that is flat or uneven, and a cross-section that is inclined or wedge-shaped.

[0224] Optical components can be in the form of films or sheets. Specific examples include light guide films.

[0225] In addition, the optical components may be suitable light guides or lenses, designed to guide light from light sources such as LEDs in vehicle headlights, taillights, fog lights, etc., such as those of cars and motorcycles.

[0226] In particular, optical components can be parts of devices and equipment that use light sources directly or indirectly, such as LEDs, organic LEDs, incandescent lamps, fluorescent lamps, or cathode tubes. Typical examples include light guide plates and components for surface light emitters.

[0227] A light guide plate is designed to guide light from a light source such as an LED in a liquid crystal backlight unit or various devices, such as display devices and lighting devices. Light entering the light guide plate from the side or back is diffused by an embossed pattern typically formed on the front, allowing it to be emitted evenly. Light guide plates are usually flat and may or may not have an embossed pattern on the front.

[0228] Light guide plates are typically and preferably formed by injection molding, high-speed injection molding, injection compression molding, or melt extrusion molding (e.g., T-die molding).

[0229] The light guide plate obtained by molding the resin composition of the present invention is not opaque, its transmittance is not reduced, and it has good hue and high transparency, with few molding defects due to mold contamination.

[0230] The light guide plate using the polycarbonate resin composition of the present invention can be applied to the fields of liquid crystal backlight units and various devices such as display devices and lighting devices. Examples of these devices include various mobile terminals, such as mobile phones, mobile laptops, netbooks, slate PCs, tablet PCs, smartphones and tablet terminals, cameras, clocks, laptops, various displays and lighting devices. In particular, the polycarbonate resin composition of the present invention can be suitably used to form high-performance side-light type light guide plates for these devices, etc.

[0231] [Example]

[0232] The invention will be described in more detail below by way of examples. However, the invention is not limited to the following examples.

[0233] The raw materials used in the examples and comparative examples are shown in Table 1.

[0234] [Table 1]

[0235]

[0236]

[0237] Examples 1 to 15 and Comparative Examples 1 to 7

[0238] Production of resin composition granules

[0239] The above components were used in the proportions (parts by mass) shown in Tables 2 and 3 below and mixed together in a rotary mixer for 20 minutes. Then, they were melt-blended at a barrel temperature of 240°C using a vented single-screw extruder (“VS-40” manufactured by Tanabe Plastics Machinery Co., Ltd.) with a screw diameter of 40 mm. The resulting filament was then cut into pellets.

[0240] Transparency of the filament during the production of resin composition granules

[0241] During the production process of resin composition granules, the transparency of the melt-blended and extruded filaments is visually assessed based on the following criteria:

[0242] A: The extruded filament has extremely high transparency and excellent compatibility between polycarbonate resin (A) and polylactone-polyether copolymer (B);

[0243] B: The extruded filament has high transparency and good compatibility between polycarbonate resin (A) and polylactone-polyether copolymer (B);

[0244] C: The extruded filament is slightly opaque, and the compatibility between polycarbonate resin (A) and polylactone-polyether copolymer (B) is poor;

[0245] D: The extruded filament is highly opaque, and the compatibility between the polycarbonate resin (A) and the polylactone-polyether copolymer (B) is extremely poor.

[0246] Gas generation during molding (evaluation of mold contamination)

[0247] Evaluation of contamination during injection molding (mold)

[0248] The granules obtained as described above were dried at 120°C for 5 hours, and then processed using an injection molding machine (“SE7M” manufactured by Sumitomo Heavy Industries, Ltd.) by means of... Figure 1 The teardrop-shaped mold shown was subjected to 200 injection molding cycles under the following conditions: barrel temperature of 340°C, molding cycle of 10 seconds, and molding temperature of 40°C. After injection molding was completed, the white contaminant adhering to the metal mirror surface on the mold's fixed side was visually assessed based on the following criteria:

[0249] A: Very few contaminants were found on the mold, which proves its excellent resistance to mold contamination;

[0250] B: The presence of a small amount of contaminants on the mold demonstrates a certain degree of mold contamination resistance;

[0251] C: Relatively many contaminants were found on the mold, which led to mold contamination;

[0252] D: Numerous contaminants were found on the mold, resulting in significant mold contamination.

[0253] Figure 1 The teardrop-shaped mold shown is designed to receive the resin composition from gate G and allows generated gas to accumulate in the tip portion P. Gate G is 1 mm wide and 1 mm thick. Figure 1 The mold has a width h1 of 14.5 mm, a length h2 of 7 mm, and a length h3 of 27 mm. The forming part is 3 mm thick.

[0254] Hue (YI)

[0255] The obtained granules were dried in a hot air circulating dryer at 120°C for 5 to 7 hours and then molded into long-path products (300mm × 7mm × 4mm) using an injection molding machine ("HSP100A" manufactured by Sodick Co., Ltd.) at a resin temperature of 340°C and a mold temperature of 80°C.

[0256] The YI (yellowness index) of long-path molded products was measured over a 300mm optical path. Measurements were performed using a long-path transmission spectrophotometer ("ASA 1" manufactured by Nippon Denshoku Industries Co., Ltd.; light source C; 2° field of view).

[0257] The evaluation results are shown in Tables 2 and 3 below.

[0258] [Table 2]

[0259]

[0260] [Table 3]

[0261]

[0262] [Industry availability]

[0263] The polycarbonate resin composition of the present invention has good hue and excellent transparency, causes minimal gas generation and mold contamination during molding, and exhibits excellent impact resistance. Therefore, this polycarbonate resin composition is extremely suitable for a variety of molded articles, especially optical components.

Claims

1. A polycarbonate resin composition comprising a polycarbonate resin (A) and a polylactone-polyether copolymer (B) comprising 0.01 to 4 parts by weight of the polycarbonate resin (A) relative to 100 parts by weight.

2. The polycarbonate resin composition according to claim 1, wherein the polylactone-polyether copolymer (B) comprises polylactone units and polyether units in a molar ratio of 5:95 to 95:

5.

3. The polycarbonate resin composition according to claim 1 or 2, wherein the polylactone-polyether copolymer (B) is a polycaprolactone-polyether copolymer.

4. The polycarbonate resin composition according to claim 3, wherein the polycaprolactone-polyether copolymer (B) is a polycaprolactone-polyether copolymer represented by the following general formula (I) or (II): R1 to R4 are each a straight-chain or branched C that can be substituted with aryloxy or alkoxy groups. 2-20 Hydrocarbon group; R5 is CH2CHCH2, CH3C(CH2)3 or CH3CH2C(CH2)3; a is an integer greater than 3; b and c are each an integer greater than 1; l, m and n are each an integer greater than 1; and o, p and q are each an integer greater than 1.

5. The polycarbonate resin composition according to claim 4, wherein R1 to R4 in general formula (I) or (II) are alkylene groups selected from the group consisting of 1,2-ethylene, 1,2-propylene, trimethylene, 1,2-butylene and tetramethylene.

6. The polycarbonate resin composition according to claim 1 or 2, wherein the number average molecular weight (Mn) of the polylactone-polyether copolymer (B) is from 200 to 10,000.

7. The polycarbonate resin composition according to claim 1 or 2, wherein the polycarbonate resin (A) has a viscosity-average molecular weight (Mv) of 10,000 to 50,000.

8. The polycarbonate resin composition according to claim 1 or 2, further comprising 0.005 to 0.5 parts by weight of a phosphorus stabilizer (C) relative to 100 parts by weight of the polycarbonate resin (A).

9. The polycarbonate resin composition according to claim 8, wherein the phosphorus stabilizer (C) comprises a phosphorus compound having a phosphite structure.

10. The polycarbonate resin composition according to claim 9, wherein the phosphorus stabilizer (C) comprises two or more phosphorus compounds having a phosphite structure, wherein at least one is a phosphite stabilizer having a spirocyclic skeleton.

11. The polycarbonate resin composition according to claim 1 or 2, further comprising 0.0005 to 0.2 parts by weight of an epoxy compound and / or an oxetane compound (D) relative to 100 parts by weight of the polycarbonate resin (A).

12. The polycarbonate resin composition according to claim 1 or 2, further comprising 0.01 to 0.5 parts by weight of fatty acid ester (E) relative to 100 parts by weight of the polycarbonate resin (A).

13. A pellet comprising the polycarbonate resin composition of claim 1 or 2.

14. A shaped article obtained by forming the granules of claim 13.

15. The molded body according to claim 14, wherein it is an optical component.

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