Polycarbonate resin composition

Abstract

To provide a polycarbonate resin composition having very high light-blocking performance and excellent impact resistance.SOLUTION: A polycarbonate resin composition comprises, relative to 100 pts.mass of a polycarbonate resin (A), more than 0.5 pt.mass and 10 pts.mass or less of a light diffusing agent (B), and more than 0.5 pt.mass and 3 pts.mass or less of carbon black (C), where the light diffusing agent (B) has an average particle size of 1.1-3.9 μm, and the content ratio between the light diffusing agent (B) and the carbon black (C), (B) / (C), is 1 or more.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a polycarbonate resin composition and a molded article, and more particularly to a polycarbonate resin composition and a molded article having extremely high light-shielding properties and excellent impact resistance. [Background technology]

[0002] Polycarbonate resin is widely used in electrical and electronic components, automobile parts, camera lenses and their parts, etc., taking advantage of its advantages such as transparency, heat resistance, and mechanical strength.

[0003] In recent years, cameras with imaging elements have come into widespread use in mobile phones, game consoles, personal computers, car-mounted cameras, etc. Camera devices equipped with these lenses are made of resin to reduce weight and cost, and the lenses, lens barrels, holders, etc. are modularized. In particular, camera modules have recently been rapidly becoming smaller, lighter, and more powerful.

[0004] A miniaturized camera module is composed of multiple lenses made of polycarbonate resin, and a barrel and holder that support the lenses. The barrel must be highly impact resistant so that it will not break even if dropped, and it must also have an extremely high degree of light-blocking properties to improve the image quality of the captured images.

[0005] In order to make a resin material light-shielding, there is a method of blending various blackening dyes or carbon black. Patent Document 1 describes that a resin composition containing a transparent or translucent thermoplastic resin (specifically, polyethylene or polypropylene), carbon black, and a light diffusing agent having a specific refractive index difference from the resin and an average particle size of less than 0.3 μm is excellent in a so-called jet black color, that is, a bluish color with a high degree of blackness. However, it is not easy to achieve the high light-shielding property described above with this material, and it is difficult to say that the impact resistance is sufficient. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2020-125376 A Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above circumstances, and an object (object) of the present invention is to provide a polycarbonate resin composition having extremely high light-shielding properties and excellent impact resistance. [Means for solving the problem]

[0008] The present inventors discovered that by combining specific amounts of a light diffusing agent having an average particle size within a specific range with carbon black, and further by specifying the content ratio of the two, it is possible to achieve high levels of both impact resistance and heat resistance, and thus completed the present invention. The present invention relates to the following polycarbonate resin composition and molded article.

[0009] 1. A polycarbonate resin composition comprising, per 100 parts by mass of polycarbonate resin (A), more than 0.5 parts by mass and not more than 10 parts by mass of a light diffuser (B), and more than 0.5 parts by mass and not more than 3 parts by mass of carbon black (C), wherein the average particle diameter of the light diffuser (B) is 1.1 to 3.9 μm, and the content ratio (B) / (C) of the light diffuser (B) to the carbon black (C) is 1 or more. 2. The polycarbonate resin composition according to the above 1, wherein the absolute value of the difference (|n1-n2|) between the refractive index n1 of the polycarbonate resin (A) and the refractive index n2 of the light diffusing agent (B) is 0.12 or more. 3. The polycarbonate resin composition according to the above 1 or 2, wherein the light diffusing agent (B) is a silicone-based light diffusing agent. 4. The polycarbonate resin composition according to any one of the above 1 to 3, wherein the light diffusing agent (B) is polymethylsilsesquioxane.

[0010] 5. The polycarbonate resin composition according to any one of 1 to 4 above, which has a spectral transmittance in the thickness direction, as measured on a 35 μm-thick film molded from the resin composition, of less than 1%. 6. Charpy notched impact strength measured according to ISO178 is 30kJ / m 2 6. The polycarbonate resin composition according to any one of 1 to 5 above. 7. A molded article made of the polycarbonate resin composition according to any one of 1 to 6 above. 8. An optical module comprising the molded article according to 7 above. Effect of the Invention

[0011] The polycarbonate resin composition of the present invention has extremely high light-shielding properties, and is also excellent in impact resistance and heat resistance. Furthermore, when the molded article of the present invention is used as a part of an optical module (for example, a camera module or the like), it has the effect of enabling high impact resistance to withstand a fall and improvement in the quality of captured images. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Each component used in the polycarbonate resin composition of the present invention will be described in detail below. In this specification, when a range is expressed using "to" with numerical values ​​or physical property values ​​on either side, this means a range that includes the values ​​before and after the range.

[0013] [Polycarbonate resin (A)] Polycarbonate resin is a polymer having a basic structure with a carbonate bond represented by the formula: -[-OXOC(=O)-]-. In the formula, X is generally a hydrocarbon, but X having a heteroatom or heterobond may be used to impart various properties. Polycarbonate resins can be classified into aromatic polycarbonate resins in which the carbons directly bonded to the carbonate bonds are aromatic carbons, and aliphatic polycarbonate resins in which the carbons directly bonded to the carbonate bonds are aliphatic carbons, and either of these can be used. Among these, aromatic polycarbonate resins are preferred from the viewpoints of heat resistance, mechanical properties, electrical properties, etc.

[0014] There is no restriction on the specific type of polycarbonate resin, but examples thereof include polycarbonate polymers obtained by reacting a dihydroxy compound with a carbonate precursor. In this case, in addition to the dihydroxy compound and the carbonate precursor, a polyhydroxy compound or the like may be reacted. Also, a method of reacting carbon dioxide as a carbonate precursor with a cyclic ether may be used. Also, the polycarbonate polymer may be linear or branched. Furthermore, the polycarbonate polymer may be a homopolymer consisting of one type of repeating unit, or may be a copolymer having two or more types of repeating units. In this case, the copolymer may be selected from various copolymerization forms such as a random copolymer and a block copolymer. In addition, such a polycarbonate polymer is usually a thermoplastic resin.

[0015] Among the monomers that are raw materials for aromatic polycarbonate resins, examples of aromatic dihydroxy compounds 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;

[0016] 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;

[0017] 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;

[0018] 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-naphthylethan, 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;

[0019] 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;

[0020] 9,9-bis(4-hydroxyphenyl)fluorene, Cardo structure-containing bisphenols such as 9,9-bis(4-hydroxy-3-methylphenyl)fluorene;

[0021] 4,4'-dihydroxydiphenyl sulfide, Dihydroxydiaryl sulfides such as 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfide;

[0022] Dihydroxydiaryl sulfoxides such as 4,4'-dihydroxydiphenyl sulfoxide and 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide;

[0023] 4,4'-dihydroxydiphenyl sulfone, dihydroxydiarylsulfones such as 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone; etc.

[0024] Of these, bis(hydroxyaryl)alkanes are preferred, and bis(4-hydroxyphenyl)alkanes are particularly preferred. In particular, from the standpoint 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 preferred. The aromatic dihydroxy compounds may be used alone or in any combination of two or more in any ratio.

[0025] Among the monomers that are raw materials for polycarbonate resins, examples of carbonate precursors include carbonyl halides, carbonate esters, etc. The carbonate precursors may be used alone or in any combination and ratio of two or more.

[0026] Specific examples of carbonyl halides include phosgene; haloformates such as bischloroformates of dihydroxy compounds and monochloroformates of dihydroxy compounds; and the like.

[0027] Specific examples of carbonate esters include diaryl carbonates such as diphenyl carbonate and ditolyl carbonate; dialkyl carbonates such as dimethyl carbonate and diethyl carbonate; biscarbonates of dihydroxy compounds, monocarbonates of dihydroxy compounds, and carbonates of dihydroxy compounds such as cyclic carbonates.

[0028] The method for producing the polycarbonate resin is not particularly limited, and any method can be used, such as interfacial polymerization, melt transesterification, pyridine method, ring-opening polymerization of a cyclic carbonate compound, and solid-phase transesterification of a prepolymer.

[0029] Preferred examples of polycarbonate resins include polycarbonate resins using bisphenol A as a dihydroxy compound or a combination of bisphenol A and other aromatic dihydroxy compounds, polycarbonate resins using bisphenol C or a combination of bisphenol C and other aromatic dihydroxy compounds (particularly bisphenol A), and further blends of these resins.

[0030] The molecular weight of the polycarbonate resin (A) is preferably in the range of 16,000 to 50,000 in terms of viscosity average molecular weight (Mv), more preferably 18,000 or more, even more preferably 20,000 or more, more preferably 45,000 or less, even more preferably 40,000 or less, and particularly preferably 38,000 or less. If the viscosity average molecular weight is less than 16,000, the impact resistance of the molded product is likely to decrease and cracks may occur, which is undesirable, and if it is more than 50,000, the fluidity is poor and moldability problems are likely to occur, which is undesirable. The polycarbonate resin (A) may be a mixture of two or more polycarbonate resins having different viscosity average molecular weights. In this case, a polycarbonate resin having a viscosity average molecular weight outside the above preferred range may be mixed.

[0031] In the present invention, the viscosity average molecular weight [Mv] of the polycarbonate resin is determined by measuring the intrinsic viscosity [η] (unit: dl / g) at a temperature of 25° C. using methylene chloride as a solvent and an Ubbelohde viscometer, and calculating the viscosity average molecular weight [Mv] according to Schnell's viscosity formula, i.e., η = 1.23 × 10 -4 Mv 0.83 The intrinsic viscosity [η] is the value calculated from the specific viscosity [η sp ] was measured and the value was calculated according to the following formula.

number

[0032] Furthermore, in the present invention, the polycarbonate resin may be constituted as a copolymer mainly composed of a polycarbonate resin, such as a copolymer with an oligomer or polymer having a siloxane structure for the purpose of further improving flame retardancy and impact resistance; a copolymer with a monomer, oligomer or polymer having a phosphorus atom for the purpose of further improving thermal oxidation stability and flame retardancy; a copolymer with a monomer, oligomer or polymer having a dihydroxyanthraquinone structure for the purpose of improving thermal oxidation stability; a copolymer with an oligomer or polymer having an olefin structure such as polystyrene for improving optical properties; or a copolymer with a polyester resin oligomer or polymer for the purpose of improving chemical resistance.

[0033] In order to improve the appearance and flowability of the molded product, the polycarbonate resin may contain a polycarbonate oligomer. The viscosity average molecular weight (Mv) of this polycarbonate oligomer is usually 1500 or more, preferably 2000 or more, and usually 9500 or less, preferably 9000 or less. When the polycarbonate oligomer is contained, the content is preferably 30 parts by mass or less, more preferably 20 parts by mass or less, and particularly preferably 10 parts by mass or less, relative to 100 parts by mass of the polycarbonate resin (A), and the lower limit when contained is preferably 1 part by mass or more, more preferably 2 parts by mass or more, and particularly preferably 3 parts by mass or more.

[0034] Furthermore, the polycarbonate resin may be not only a virgin raw material, but also a polycarbonate resin regenerated from a used product (so-called material recycled polycarbonate resin). However, the recycled polycarbonate resin is preferably 80% by mass or less, more preferably 50% by mass or less, of the polycarbonate resin (A). Since the recycled polycarbonate resin is highly likely to have been deteriorated by heat, aging, etc., if such a polycarbonate resin is used in an amount greater than the above range, the hue and mechanical properties may be deteriorated.

[0035] [Light Diffuser (B)] The polycarbonate resin composition of the present invention contains a light diffusing agent (B) having an average particle size of 1.1 to 3.9 μm. More preferred examples of the light diffusing agent include acrylic resin fine particles and / or silicone fine particles.

[0036] As the acrylic resin fine particles, crosslinked acrylic polymer fine particles are preferred. Preferred examples of the crosslinked acrylic polymer include an acrylic monomer alone, and a copolymer of an acrylic monomer and a styrene monomer.

[0037] Specific examples of the acrylic monomer include methacrylate monomers such as methyl methacrylate and ethyl methacrylate, acrylate monomers such as methyl acrylate and ethyl acrylate, acrylamide, etc. Specific examples of the styrene monomer include styrene, α-methylstyrene, vinyltoluene, etc.

[0038] In the polymerization or copolymerization of these monomers, these may be used as the main component and, if necessary, other monomers may be further copolymerized as crosslinking agents, etc. Examples of such crosslinking agents include various polyfunctional monomers such as ethylene glycol dimethacrylate, divinylbenzene, 1,6-hexanediol, trimethylpropane trimethacrylate, trimethylpropane trimethacrylate, and trimethylpropane triacrylate.

[0039] As the silicone-based fine particles, crosslinked siloxane-based polymer particles are preferred, and preferred examples of the polyorganosiloxane constituting these include polyorganosiloxanes having a phenyl group, a diphenyl group, a vinyl group, or an alkoxy group (e.g., a methoxy group, an ethoxy group, an n-propoxy group, an isopropoxy group, an n-butoxy group, an isobutoxy group, a sec-butoxy group, a tert-butoxy group, etc.), polyorganosiloxanes having a phenyl group and a diphenyl group, polyorganosiloxanes having a vinyl group and an alkoxy group, polyorganosiloxanes having a phenyl group, an alkoxy group, and a vinyl group, and the like.

[0040] The polyorganosiloxane is preferably polyorganosilsesquioxane. Polyorganosilsesquioxane is R-SiO 1.5 (R is a monovalent organic group), and refers to a polyorganosiloxane having a trifunctional siloxane unit (hereinafter sometimes referred to as "T unit"), which is 50 mol% or more out of a total of 100 mol% of all siloxane units. The proportion of T units is more preferably 80 mol% or more, even more preferably 90 mol% or more, and particularly preferably 95 mol% or more.

[0041] Preferred examples of the organic group R bonded to the polyorganosilsesquioxane include alkyl groups having 1 to 20 carbon atoms, such as methyl, ethyl, propyl, butyl, hexyl, decyl, dodecyl, and octadecyl groups, cyclic alkyl groups, such as cyclohexyl groups, aryl groups, such as phenyl, tolyl, and xylyl groups, and aralkyl groups, such as phenylethyl and phenylpropyl groups. As the polyorganosilsesquioxane, polyalkylsilsesquioxanes are preferred, and polymethylsilsesquioxane siloxane is particularly preferred.

[0042] The light diffusing agent (B) is preferably a silicone-based light diffusing agent, and polymethylsilsesquioxane siloxane is particularly preferred because it has a high light diffusing effect and a high thermal decomposition temperature, thereby improving the heat resistance of the resin composition.

[0043] The light diffusing agent (B) has an average particle diameter of 1.1 to 3.9 μm. By combining the light diffusing agent (B) with carbon black (C), a high level of light shielding can be achieved. If the particle diameter is less than 1.1 μm, the effect of improving the light diffusibility of the resulting polycarbonate resin composition is small, and transmission due to light diffraction may occur, and the resin composition is difficult to disperse during production, and light leakage due to poor dispersion is likely to occur. If the particle diameter exceeds 3.9 μm, light leakage due to poor dispersion during production of the resin composition is likely to occur, and the light shielding effect is small, and light shielding properties are likely to deteriorate. The average particle diameter is preferably 1.3 μm or more, more preferably 1.5 μm or more, among which 1.7 μm or more, 1.9 μm or more, and particularly preferably 2 μm or more, and also preferably 3.7 μm or less, more preferably 3.5 μm or less, among which 3.3 μm or less, 3.2 μm or less, and particularly preferably 3 μm or less, and particularly preferably 2 to 3 μm.

[0044] The average particle size was calculated by using a laser diffraction / scattering particle size distribution analyzer or the like, and was calculated from the particle size distribution diagram. 50 It can be calculated as the average value.

[0045] The refractive index of the light diffusing agent (B) is preferably 1.3 to 1.6, and more preferably 1.4 to 1.5. The absolute value of the difference between the refractive index n2 of the light diffusing agent (B) and the refractive index n1 of the polycarbonate resin (A) (|n1-n2|) is preferably 0.12 or more, and such a refractive index difference can block light by impeding the path of light, thereby further improving the light blocking property. |n1-n2| is more preferably 0.13 or more, even more preferably 0.14 or more, particularly preferably 0.15 or more, and more preferably 0.21 or less, even more preferably 0.20 or less, particularly preferably 0.19 or less, and is particularly preferably in the range of 0.15 to 0.19.

[0046] The content of the light diffusing agent (B) is more than 0.5 parts by mass and not more than 10 parts by mass relative to 100 parts by mass of the polycarbonate resin (A). By including it in such an amount, high light shielding properties and impact resistance can be achieved. If it exceeds 10 parts by mass, the impact resistance of the resin composition decreases and the heat resistance also deteriorates, and if it is 0.5 parts by mass or less, the light shielding properties become insufficient. The content is preferably 0.7 parts by mass or more, particularly 0.8 parts by mass or more, 0.9 parts by mass or more, and particularly 1 part by mass or more, and is preferably 8 parts by mass or less, particularly 7 parts by mass or less, 6 parts by mass or less, and particularly 5 parts by mass or less, and particularly preferably 1 to 5 parts by mass.

[0047] [Carbon black (C)] The polycarbonate resin composition of the present invention contains carbon black (C). The carbon black is not limited in its production method, raw material type, etc., and any conventionally known carbon black can be used, such as oil furnace black, channel black, acetylene black, ketjen black, etc. Among these, oil furnace black is preferred from the standpoint of colorability and cost.

[0048] The average particle size of the carbon black (C) may be appropriately selected and determined, but is preferably 5 to 60 nm, more preferably 7 to 55 nm, and particularly preferably 10 to 50 nm. By making the average particle size 5 nm or more, the flowability tends to be improved, and by making it 60 nm or less, the light blocking property of the molded article is improved.

[0049] The nitrogen adsorption specific surface area of ​​carbon black (C) is usually 1000 m 2 / g or less is preferable, and 50 to 400m 2 / g. The nitrogen adsorption specific surface area is preferably 1000 m 2 By making the specific surface area by nitrogen adsorption less than 1 / g, the flowability of the polycarbonate resin composition of the present invention and the appearance of the molded article tend to be improved, which is preferable. The nitrogen adsorption specific surface area can be measured in accordance with JIS K6217. The DBP absorption of carbon black (C) is 300 cm 3 / 100g or less is preferable, and 30 to 200cm 3 / 100g. DBP absorption is preferably 300cm 3 By setting the DBP absorption amount to less than / 100g, the fluidity of the polycarbonate resin composition and the appearance of the molded article tend to be improved, which is preferable. The DBP absorption amount can be measured in accordance with JIS K6217.

[0050] The carbon black (C) can be used alone or in combination of two or more kinds. The carbon black can also be granulated using a binder, and it is also preferable to use the carbon black as a masterbatch in which the carbon black is melt-kneaded at a high concentration in a resin such as a polystyrene-based resin.

[0051] The content of carbon black (C) is more than 0.5 parts by mass and not more than 3 parts by mass relative to 100 parts by mass of polycarbonate resin (A). By including it in such an amount, high light shielding properties and impact resistance can be achieved. If it exceeds 3 parts by mass, the impact resistance of the resin composition is significantly reduced, and the heat resistance is also deteriorated, and if it is 0.5 parts by mass or less, the light shielding properties become insufficient. The content is preferably 0.6 parts by mass or more, more preferably 0.7 parts by mass or more, 0.8 parts by mass or more, and particularly preferably 1 part by mass or more, and more preferably 2.5 parts by mass or less, more preferably 2 parts by mass or less, and particularly preferably 1 to 2 parts by mass.

[0052] In the present invention, the ratio (B) / (C) of the content of the light diffusing agent (B) to the content of the carbon black (C) is set to 1 or more. By setting it to 1 or more, it is possible to improve the impact resistance and provide excellent light blocking properties. If the carbon black (C) is relatively large, that is, if it is less than 1, the impact resistance decreases. (B) / (C) is preferably 1.2 or more, more preferably 1.3 or more, of which 1.4 or more, particularly preferably 1.5 or more, and more preferably 5 or less, of which 4.5 or less, 4 or less, particularly preferably 3.5 or less.

[0053] [Filling material] The polycarbonate resin composition of the present invention preferably contains a filler. The filler to be used preferably has an average particle size of 0.1 to 10 μm, more preferably 9 μm or less, among which 8 μm or less, 7 μm or less, 6 μm or less, 5 μm or less, 4 μm or less, further 3 μm or less, and particularly 2.5 μm or less is preferable. Also, it is preferably 0.12 μm or more, more preferably 0.15 μm or more, 0.18 μm or more, of which 0.2 μm or more is particularly preferred, and 0.25 μm or more is particularly preferred.

[0054] The average particle size of the filler was measured by the laser diffraction method. 50 It can be calculated as the average value.

[0055] The filler is preferably an inorganic filler, more preferably a plate-like filler, and specifically, talc, mica, glass flake, montmorillonite, hydrotalcite, sericite, kaolin, alumina, clay, graphite, etc. are preferred, and one type may be used alone, or two or more types may be mixed and used.

[0056] Among these, talc and mica are preferred, with talc being particularly preferred. By including talc together with the various components described below, the resin composition can have lower anisotropy and lower linear expansion, and can also have improved rigidity.

[0057] The talc used has an average particle size of 0.1 to 10 μm. The average particle size is preferably 0.3 to 8 μm, and more preferably 0.7 to 5 μm. By making the average particle size 0.1 μm or more, the thermal stability of the resin composition tends to be improved, and by making the average particle size 10 μm or less, the appearance and rigidity of the molded product of the resin composition are improved.

[0058] Talc is also preferably surface-treated to enhance its affinity with the polycarbonate resin (A).Specific examples of the surface treatment agent include at least one selected from alcohols such as trimethylolethane, trimethylolpropane, and pentaerythritol, alkanolamines such as triethylamine, organic silicone compounds such as organopolysiloxane, higher fatty acids such as stearic acid, fatty acid metal salts such as calcium stearate and magnesium stearate, hydrocarbon lubricants such as polyethylene wax and liquid paraffin, basic amino acids such as lysine and arginine, polyglycerin and their derivatives, and coupling agents such as silane coupling agents, titanate coupling agents, and aluminum coupling agents.

[0059] In addition, from the viewpoint of surface appearance and thermal stability when contained in a resin composition, the talc is preferably in the form of granules granulated using a binder. In the case of granular talc, the bulk density is preferably 0.4 to 1.5 g / ml.

[0060] The preferred content of the filler is 1 to 50 parts by mass relative to 100 parts by mass of the polycarbonate resin (A). Within this range, low linear expansion and sufficient mechanical properties can be obtained. If the content of the filler is less than 1 part by mass, it becomes difficult to achieve low linear expansion and rigidity is likely to be insufficient, and if it exceeds 50 parts by mass, production stability and toughness are likely to decrease. The content of the filler is preferably 3 parts by mass or more, more preferably 5 parts by mass or more, and is preferably 45 parts by mass or less, more preferably 40 parts by mass or less, even more preferably 35 parts by mass or less, and particularly preferably 30 parts by mass or less.

[0061] [ABS resin] The resin composition of the present invention also preferably contains an ABS resin. The ABS resin preferably comprises an aromatic vinyl monomer component (c1), a vinyl cyanide monomer component (c2), a diene rubber polymer component (c3) and other monomer components (c4), and preferably comprises 40 to 80 mass% of the aromatic vinyl monomer component (c1), 10 to 30 mass% of the vinyl cyanide monomer component (c2), 10 to 30 mass% of the diene rubber polymer component (c3) and 0 to 30 mass% of the other monomer components (c4) relative to 100 mass% in total of the components (c1) to (c4).

[0062] Examples of the aromatic vinyl monomer component (c1) in the ABS resin include styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, vinylxylene, ethylstyrene, dimethylstyrene, p-tert-butylstyrene, vinylnaphthalene, methoxystyrene, monobromostyrene, dibromostyrene, fluorostyrene, and tribromostyrene, with styrene being particularly preferred. The proportion of the aromatic vinyl monomer component (c1) in the ABS resin is preferably in the range of 40 to 80 mass%, more preferably 45 mass% or more, even more preferably 50 mass% or more, particularly preferably 55 mass% or more, and more preferably 77 mass% or less, even more preferably 74 mass% or less, particularly preferably 70 mass% or less, based on 100 mass% of the ABS resin.

[0063] Examples of the vinyl cyanide monomer component (c2) in the ABS resin include acrylonitrile and methacrylonitrile, with acrylonitrile being particularly preferred. The proportion of the vinyl cyanide monomer component (c2) in 100% by mass of the ABS resin is, as described above, preferably in the range of 10 to 30% by mass, but is more preferably 12% by mass or more, even more preferably 14% by mass or more, particularly preferably 15% by mass or more, and is more preferably 28% by mass or less, even more preferably 26% by mass or less, particularly preferably 25% by mass or less.

[0064] As the diene rubber polymer component (c3) of the ABS resin, for example, rubber components such as polybutadiene, polyisoprene, styrene-butadiene copolymer, etc. are used, and the proportion of the diene rubber polymer component (c3) in the ABS resin is preferably in the range of 10 to 30 mass% in 100 mass% of the ABS resin, more preferably 11 mass% or more, even more preferably 12 mass% or more, particularly preferably 13 mass% or more, more preferably 25 mass% or less, and even more preferably 20 mass% or less.

[0065] Furthermore, they may be copolymerized with other monomer components (c4) copolymerizable therewith. In this case, examples of the other copolymerizable monomers include maleimide-based monomers such as maleimide, N-methylmaleimide, N-cyclohexylmaleimide, and N-phenylmaleimide, acrylamide-based monomers such as acrylamide and N-methylacrylamide, unsaturated acid anhydrides such as maleic anhydride and itaconic anhydride, unsaturated acids such as acrylic acid and methacrylic acid, glycidyl acrylate, glycidyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, and methoxypolyethylene glycol methacrylate. As described above, the proportion of the other monomer component (c4) in the ABS resin is preferably in the range of 0 to 30 mass% relative to 100 mass% of the ABS resin, more preferably 20 mass% or less, and even more preferably 10 mass% or less.

[0066] Specific preferred examples of ABS resins include acrylonitrile-butadiene-styrene copolymers, acrylonitrile-butadiene-styrene-α-methylstyrene copolymers, and acrylonitrile-butadiene-styrene-N-phenylmaleimide copolymers.

[0067] The content of the ABS resin, when contained, is 1 to 20 parts by mass, preferably 3 parts by mass or more, more preferably 5 parts by mass or more, and preferably 18 parts by mass or less, more preferably 15 parts by mass or less, even more preferably 12 parts by mass or less, and particularly preferably 10 parts by mass or less, relative to 100 parts by mass of the polycarbonate resin (A). If it is less than 1 part by mass, it is not preferable because the impact resistance at low temperatures decreases. On the other hand, if the content of the ABS resin exceeds 20 parts by mass, it is not preferable because the heat resistance and surface hardness decrease.

[0068] [Olefin-Maleic Anhydride Copolymer] By including an olefin-maleic anhydride copolymer together with the components mentioned above and below, direct contact between the polycarbonate resin and the filler is prevented, improving the thermal stability and mechanical properties of the resin composition, and further enhancing impact resistance.

[0069] As the olefin-maleic anhydride copolymer, an olefin-maleic anhydride copolymer and / or a maleic anhydride-modified olefin polymer are preferred.

[0070] Olefin-maleic anhydride copolymers include copolymers of maleic anhydride and α-olefins, copolymers with conjugated diene monomers, and copolymers of conjugated dienes and aromatic vinyl monomers.

[0071] Preferred examples of the α-olefin include α-olefins having 2 to 10 carbon atoms, such as ethylene, propylene, butene-1, pentene-1, hexene-1, 4-methylpentene-1, octene-1, and 1-decene, which may be used alone or in combination. Among these, ethylene, propylene, butene-1, hexene-1, and octene-1 are more preferred, and a combination of ethylene with propylene, butene-1, hexene-1, or octene-1 is particularly preferred.

[0072] As the conjugated diene monomer, 1,3-butadiene, isoprene (i.e., 2-methyl-1,3-butadiene), 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, etc., can be used alone or in combination. These polymers in which a part or all of the unsaturated bonds have been reduced by hydrogenation can also be preferably used. Examples of the aromatic vinyl monomer include styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, 1,3-dimethylstyrene, and vinylnaphthalene, and among these, styrene is preferably used.

[0073] As the α-olefin-maleic anhydride copolymer, maleic anhydride-ethylene-propylene copolymer and maleic anhydride-ethylene-butene-1 copolymer are particularly preferred.

[0074] Examples of the olefin polymer in the maleic anhydride modified olefin polymer include homopolymers or ethylene copolymers of α-olefins such as ethylene, propylene, butene-1, pentene-1, hexene-1, 4-methylpentene-1, and octene-1, conjugated diene polymers (homopolymers or copolymers of diolefin monomers), conjugated diene / aromatic vinyl hydrocarbon copolymers, and non-conjugated dienes, and these may be used in combination of two or more.

[0075] The homopolymers referred to here include polyethylene, polypropylene, polybutene, etc. As the polyethylene, LDPE, LLDPE, HDPE, etc., any one of the molecular structures can be preferably used. Furthermore, the ethylene-based copolymer refers to a copolymer or multicomponent copolymer of ethylene and other monomers. In the ethylene-based copolymer, the copolymerization amount of ethylene is preferably 50 to 99 mol %. The other monomer to be copolymerized with ethylene can be selected from α-olefins having 3 or more carbon atoms, non-conjugated dienes, vinyl acetate, etc. Examples of the α-olefin having 3 or more carbon atoms include propylene, butene-1, pentene-1, 3-methylpentene-1, and octene-1, with propylene and butene-1 being preferred.

[0076] Among these ethylene-based copolymers, copolymers of ethylene and an α-olefin having 3 or more carbon atoms are preferred, and specifically, ethylene-propylene copolymers, ethylene-butene-1 copolymers and the like are particularly preferred.

[0077] Non-conjugated dienes include 5-methylidene-2-norbornene, 5-ethylidene-2-norbornene, 5-vinyl-2-norbornene, 5-propenyl-2-norbornene, 5-isopropenyl-2-norbornene, 5-crotyl-2-norbornene, 5-(2-methyl-2-butenyl)-2-norbornene, 5-(2-ethyl-2-butenyl)-2-norbornene, and 5-methyl-5-vinylnorbornene. Norbornene compounds, dicyclopentadiene, methyltetrahydroindene, 4,7,8,9-tetrahydroindene, 1,5-cyclooctadiene, 1,4-hexadiene, isoprene, 6-methyl-1,5-heptadiene, 11-tridecadiene, etc., and preferred examples include 5-methylidene-2-norbornene, 5-ethylidene-2-norbornene, dicyclopentadiene, 1,4-hexadiene, etc.

[0078] Examples of the conjugated diene polymer include homopolymers or copolymers of conjugated diene monomers such as 1,3-butadiene, isoprene (2-methyl-1,3-butadiene), 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, etc. Polymers in which a part or all of the unsaturated bonds present in these polymers have been reduced by hydrogenation can also be preferably used.

[0079] Furthermore, copolymers of conjugated dienes and aromatic vinyl hydrocarbons can also be used. For example, there are block copolymers or random copolymers with various ratios of conjugated dienes and aromatic vinyl hydrocarbons, and examples of the conjugated dienes that constitute these include the above-mentioned monomers, and in particular 1,3-butadiene and isoprene are preferred. Examples of aromatic vinyl hydrocarbons include styrene, α-methylstyrene, o-methylstyrene, p-methylstyrene, 1,3-dimethylstyrene, vinylnaphthalene, and the like, and among these, styrene is preferred. In addition, conjugated diene-aromatic vinyl hydrocarbon copolymers in which a part or all of the unsaturated bonds other than the aromatic rings have been reduced by hydrogenation can also be preferably used. Preferred examples include styrene-butadiene-styrene block copolymers and copolymers obtained by partially hydrogenating styrene-butadiene-styrene block copolymers.

[0080] Preferred examples of the olefin polymers described above include ethylene-propylene copolymers, ethylene-butene-1 copolymers, and copolymers obtained by partially hydrogenating styrene-butadiene-styrene block copolymers, with ethylene-propylene copolymers being particularly preferred.

[0081] The maleic anhydride-modified olefin polymer is obtained by graft-modifying the olefin polymer with maleic anhydride. A known method can be used for the graft-modification. For example, a predetermined amount of unsaturated carboxylic acid can be mixed and reacted with a molten olefin polymer using an extruder. The amount of maleic anhydride to be grafted is usually in the range of 0.005 to 25% by mass, and preferably 0.01 to 20% by mass, based on 100% by mass of the maleic anhydride modified olefin polymer.

[0082] The preferred content of the olefin-maleic anhydride copolymer is 0.1 to 5 parts by mass relative to 100 parts by mass of the polycarbonate resin (A). In this range, the deterioration of the polycarbonate resin can be suppressed, the impact resistance is high, and the mold contamination due to the generated gas is reduced. If the content of the copolymer is less than 0.1 parts by mass, the impact resistance of the molded product is likely to decrease, and if it exceeds 5 parts by mass, the rigidity of the molded product is likely to decrease, and the mold contamination due to the generated gas during molding is likely to increase. The more preferred content of the copolymer is 0.3 parts by mass or more, even more preferably 0.5 parts by mass or more, more preferably 4.5 parts by mass or less, even more preferably 4 parts by mass or less, among which 3.5 parts by mass or less, 3 parts by mass or less, 2.5 parts by mass or less, and particularly 2 parts by mass or less are preferred.

[0083] [Elastomer] The polycarbonate resin composition of the present invention preferably contains an elastomer, which can improve the impact resistance of the resin composition.

[0084] The elastomer used in the present invention is preferably a graft copolymer obtained by graft-copolymerizing a rubber component with a monomer component copolymerizable therewith. The method for producing the graft copolymer may be any of bulk polymerization, solution polymerization, suspension polymerization, emulsion polymerization, etc., and the copolymerization method may be one-stage grafting or multi-stage grafting.

[0085] The rubber component usually has a glass transition temperature of 0° C. or lower, preferably -20° C. or lower, and more preferably -30° C. or lower. Specific examples of the rubber component include polybutadiene rubber, polyisoprene rubber, polyalkyl acrylate rubber such as polybutyl acrylate, poly(2-ethylhexyl acrylate), and butyl acrylate-2-ethylhexyl acrylate copolymer, silicone rubber such as polyorganosiloxane rubber, butadiene-acrylic composite rubber, IPN (Interpenetrating Polymer Network) type composite rubber consisting of polyorganosiloxane rubber and polyalkyl acrylate rubber, styrene-butadiene rubber, ethylene-α-olefin rubber such as ethylene-propylene rubber, ethylene-butene rubber, and ethylene-octene rubber, ethylene-acrylic rubber, and fluororubber. These may be used alone or in combination of two or more. Among these, polybutadiene rubber, polyalkyl acrylate rubber, polyorganosiloxane rubber, IPN type composite rubber consisting of polyorganosiloxane rubber and polyalkyl acrylate rubber, and styrene-butadiene rubber are preferred from the standpoint of mechanical properties and surface appearance.

[0086] Specific examples of the monomer component that can be graft-copolymerized with the rubber component include aromatic vinyl compounds, vinyl cyanide compounds, (meth)acrylic acid ester compounds, (meth)acrylic acid compounds, epoxy group-containing (meth)acrylic acid ester compounds such as glycidyl (meth)acrylate; maleimide compounds such as maleimide, N-methylmaleimide, and N-phenylmaleimide; α,β-unsaturated carboxylic acid compounds such as maleic acid, phthalic acid, and itaconic acid, and their anhydrides (e.g., maleic anhydride, etc.). These monomer components may be used alone or in combination of two or more. Among these, from the standpoint of mechanical properties and surface appearance, aromatic vinyl compounds, vinyl cyanide compounds, (meth)acrylic acid ester compounds, and (meth)acrylic acid compounds are preferred, and (meth)acrylic acid ester compounds are more preferred. Specific examples of the (meth)acrylic acid ester compounds include methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, cyclohexyl (meth)acrylate, and octyl (meth)acrylate.

[0087] The graft copolymer obtained by copolymerizing a rubber component is preferably a core / shell type graft copolymer in terms of impact resistance and surface appearance. Among them, a core / shell type graft copolymer is particularly preferred, which is composed of a core layer made of at least one rubber component selected from polybutadiene-containing rubber, polybutyl acrylate-containing rubber, polyorganosiloxane rubber, and an IPN type composite rubber made of polyorganosiloxane rubber and polyalkyl acrylate rubber, and a shell layer formed by copolymerizing (meth)acrylic acid ester around the core layer. The core / shell type graft copolymer preferably contains 40% by mass or more of the rubber component, more preferably 60% by mass or more. Also, it is preferable that the (meth)acrylic acid is contained in an amount of 10% by mass or more.

[0088] Of the above-mentioned elastomers, the core / shell type elastomer is preferably used, and among these, a core / shell type elastomer having a silicone-acrylic composite, an acrylic rubber, or a butadiene rubber as the core is preferred, and a core / shell type elastomer having a butadiene rubber as the core is particularly preferred.

[0089] In the present invention, the core / shell type does not necessarily mean that the core layer and the shell layer are clearly distinguishable, but is intended to broadly include compounds obtained by graft polymerizing a rubber component around a core portion.

[0090] Specific examples of preferred core / shell type graft copolymers include methyl methacrylate-butadiene-styrene copolymer (MBS), methyl methacrylate-acrylonitrile-butadiene-styrene copolymer (MABS), methyl methacrylate-butadiene copolymer (MB), methyl methacrylate-acrylic rubber copolymer (MA), methyl methacrylate-acrylic rubber-styrene copolymer (MAS), methyl methacrylate-acrylic-butadiene rubber copolymer, methyl methacrylate-(acrylic-silicone IPN rubber) copolymer, silicone-acrylic composite rubber containing polyorganosiloxane and polyalkyl(meth)acrylate, etc., and silicone-acrylic composite rubber containing polyorganosiloxane and polyalkyl(meth)acrylate and methyl methacrylate-butadiene copolymer are particularly preferred. Such rubbery polymers may be used alone or in combination of two or more.

[0091] The content of the elastomer is preferably 1 to 25 parts by mass, more preferably 2 parts by mass or more, even more preferably 2.5 parts by mass or more, particularly preferably 3 parts by mass or more, and more preferably 20 parts by mass or less, even more preferably 18 parts by mass or less, particularly preferably 15 parts by mass or less, relative to 100 parts by mass of the polycarbonate resin (A). The elastomer may be one type or two or more types. When two or more types are contained, the total amount falls within the above range.

[0092] [Fluorine-containing resin] By containing the fluorine-containing resin together with each of the above-mentioned components, the fluorine-containing resin acts like a surfactant to improve impact resistance, and the mechanical properties of the resin composition can be further improved, and the flame retardancy can be further improved by improving the ability to prevent dripping during combustion. By setting the content ratio of the elastomer to the fluorine-containing resin (elastomer / fluorine-containing resin) to be preferably more than 1 to 250, the impact strength can be dramatically improved, and high rigidity and high impact resistance can be achieved.

[0093] The fluorine-containing resin is preferably a fluoroolefin resin. The fluoroolefin resin is usually a polymer or copolymer containing a fluoroethylene structure, and specific examples thereof include a difluoroethylene resin, a tetrafluoroethylene resin, and a tetrafluoroethylene / hexafluoropropylene copolymer resin, with the tetrafluoroethylene resin being particularly preferred. The fluororesin is preferably one having fibril-forming ability, specifically, a fluoroolefin resin having fibril-forming ability. The fibril-forming ability significantly improves impact resistance and flexural modulus, and also tends to improve drip prevention during combustion.

[0094] In addition, an organic polymer-coated fluoroolefin resin can also be suitably used as the fluorine-containing resin. By using an organic polymer-coated fluoroolefin resin, dispersibility is improved, the surface appearance of the molded article is improved, and surface foreign matter can be suppressed. As a monomer for producing an organic polymer that coats the fluoroolefin resin, from the viewpoint of dispersibility when blended with a polycarbonate resin, one having high affinity with the polycarbonate resin is preferred, and an aromatic vinyl monomer, a (meth)acrylic acid ester monomer, or a vinyl cyanide monomer is more preferred.

[0095] The fluorine-containing resin may be used alone or in any combination of two or more kinds in any ratio.

[0096] The content of the fluorine-containing resin is preferably 0.05 to 10 parts by mass per 100 parts by mass of the polycarbonate resin (A), and the upper limit is preferably 8 parts by mass or less, more preferably 5 parts by mass or less, even more preferably 3 parts by mass or less, and particularly preferably 2 parts by mass or less. By setting the content of the fluororesin to 0.05 part by mass or more, a sufficient effect of improving mechanical properties can be easily obtained, and by setting it to 10 parts by mass or less, poor appearance due to poor dispersion of the fluororesin in a molded article obtained by molding the resin composition is made less likely to occur, and high mechanical strength can be easily maintained.

[0097] [Flame retardant] The polycarbonate resin composition also preferably contains a flame retardant, the content of which is preferably 0.01 to 30 parts by mass, more preferably 0.03 to 20 parts by mass, based on 100 parts by mass of the polycarbonate resin (A). Examples of the flame retardant include organic metal salt-based flame retardants, siloxane-based flame retardants, phosphorus-based flame retardants, boron-based flame retardants, nitrogen-based flame retardants, and halogen-based flame retardants. In the present invention, the organic metal salt-based flame retardants are particularly preferred.

[0098] As the organometallic salt compound, an organosulfonic acid metal salt is particularly preferred. The metal of the metal salt compound is preferably an alkali metal or an alkaline earth metal, and examples of the alkali metal include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), etc.; and alkaline earth metals include magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), etc. Among these, sodium, potassium, and cesium are particularly preferred.

[0099] Examples of the metal salt of organic sulfonate include lithium organic sulfonate, sodium organic sulfonate, potassium organic sulfonate, rubidium organic sulfonate, cesium organic sulfonate, magnesium organic sulfonate, calcium organic sulfonate, strontium organic sulfonate, barium organic sulfonate, etc. Among these, alkali metal organic sulfonate such as sodium organic sulfonate, potassium organic sulfonate, and cesium organic sulfonate are particularly preferred.

[0100] Among the organic sulfonic acid metal salt compounds, preferred examples include metal salts of fluorine-containing aliphatic sulfonic acid or aromatic sulfonic acid.Specific examples of preferred ones include alkali metal salts of fluorine-containing aliphatic sulfonic acid having at least one C-F bond in the molecule, such as potassium perfluorobutanesulfonate, lithium perfluorobutanesulfonate, sodium perfluorobutanesulfonate, and cesium perfluorobutanesulfonate; alkaline earth metal salts of fluorine-containing aliphatic sulfonic acid having at least one C-F bond in the molecule, such as magnesium perfluorobutanesulfonate, calcium perfluorobutanesulfonate, barium perfluorobutanesulfonate, magnesium trifluoromethanesulfonate, calcium trifluoromethanesulfonate, and barium trifluoromethanesulfonate; and other fluorine-containing aliphatic sulfonic acid metal salts;

[0101] Dipotassium diphenylsulfone-3,3'-disulfonate, potassium diphenylsulfone-3-sulfonate, sodium benzenesulfonate, sodium (poly)styrenesulfonate, sodium paratoluenesulfonate, sodium (branched)dodecylbenzenesulfonate, sodium trichlorobenzenesulfonate, potassium benzenesulfonate, potassium styrenesulfonate, potassium (poly)styrenesulfonate, potassium paratoluenesulfonate, potassium (branched)dodecylbenzenesulfonate, potassium trichlorobenzenesulfonate, cesium benzenesulfonate, cesium (poly)styrenesulfonate Examples of aromatic sulfonic acid metal salts include alkali metal salts of aromatic sulfonic acids having at least one aromatic group in the molecule, such as cesium paratoluenesulfonate, cesium (branched) dodecylbenzenesulfonate, and cesium trichlorobenzenesulfonate; and alkaline earth metal salts of aromatic sulfonic acids having at least one aromatic group in the molecule, such as magnesium paratoluenesulfonate, calcium paratoluenesulfonate, strontium paratoluenesulfonate, barium paratoluenesulfonate, magnesium (branched) dodecylbenzenesulfonate, and calcium (branched) dodecylbenzenesulfonate.

[0102] Among the above-mentioned examples, alkali metal salts of fluorinated aliphatic sulfonic acids and alkali metal salts of aromatic sulfonic acids are more preferred, alkali metal salts of fluorinated aliphatic sulfonic acids are particularly preferred, and alkali metal salts of perfluoroalkanesulfonic acids are further preferred, specifically potassium perfluorobutanesulfonate and the like are preferred. The metal salt compounds may be used alone or in any combination of two or more in any ratio.

[0103] When an organic metal salt flame retardant is contained, the content is preferably 0.01 to 1.5 parts by mass, more preferably 0.02 parts by mass or more, even more preferably 0.03 parts by mass or more, more preferably 1 part by mass or less, even more preferably 0.5 parts by mass or less, of which 0.3 parts by mass or less, and particularly preferably 0.15 parts by mass or less, relative to 100 parts by mass of the polycarbonate resin (A).

[0104] [Additives, etc.] The polycarbonate resin composition may contain additives other than those described above, such as stabilizers, release agents, colorants, fluorescent brighteners, antistatic agents, plasticizers, compatibilizers, etc. These additives or other resins may be blended in one or more types.

[0105] The polycarbonate resin composition may also contain other resins other than the polycarbonate resin (A), olefin-maleic anhydride copolymer, ABS resin, and elastomer. Examples of the other resins include thermoplastic polyester resins such as polyethylene terephthalate resin, polytrimethylene terephthalate resin, and polybutylene terephthalate resin; polyolefin resins such as polyethylene resin and polypropylene resin; polyamide resin; polyimide resin; polyetherimide resin; polyphenylene ether resin; polyphenylene sulfide resin; polysulfone resin, and the like. The other resins may be contained alone or in any combination and ratio of two or more. However, when a resin other than the polycarbonate resin (A) is contained, the content thereof 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 the polycarbonate resin (A).

[0106] [Production of polycarbonate resin composition] There is no limitation on the method for producing the polycarbonate resin composition, and a wide variety of known methods for producing polycarbonate resin compositions can be used, including a method in which the above-mentioned essential components and other components to be mixed as necessary are mixed in advance using various mixers such as a tumbler or a Henschel mixer, and then melt-kneaded using a mixer such as a Banbury mixer, a roll, a Brabender, a single-screw kneading extruder, a twin-screw kneading extruder, a kneader, etc. The temperature for melt-kneading is not particularly limited, but is usually in the range of 260 to 320°C.

[0107] The polycarbonate resin composition of the present invention can be pelletized to produce various molded articles by molding the pellets by various molding methods. Alternatively, the resin melt-kneaded in an extruder can be directly molded into a molded article without going through the pelletizing process.

[0108] The polycarbonate resin composition of the present invention has extremely excellent light-shielding properties, and when molded into a molded article, the composition exhibits excellent light-shielding properties even in its extremely thin wall portion. That is, the spectral transmittance in the thickness direction measured on a 35 μm-thick film molded from the resin composition is preferably less than 1%, more preferably 0.8% or less, even 0.7% or less, among which 0.6% or less, 0.5% or less, 0.4% or less, and particularly 0.3% or less.

[0109] The polycarbonate resin composition of the present invention has excellent impact resistance, and the notched Charpy impact strength (4 mmt) measured in accordance with ISO179 is preferably 35 kJ / m 2 That's all.

[0110] The polycarbonate resin composition has excellent heat resistance, and the deflection temperature under load DTUL measured based on ISO 75 A method is preferably 120°C or higher, more preferably 121°C or higher, even more preferably 122°C or higher, and particularly preferably 123°C or higher.

[0111] The molded article obtained from the polycarbonate resin composition of the present invention is excellent in impact resistance and flexural modulus, and further exhibits low anisotropy. Therefore, examples of its applications include housing parts and lens barrels for cameras, telescopes, microscopes, projection exposure devices, optical measuring devices, etc.; housing parts and mechanical parts for mobile phone cameras, smartphone cameras, tablet cameras, car-mounted cameras, action cameras, notebook PC cameras, drive recorders, surveillance cameras, small cameras mounted on drones, etc.; housings and mechanical parts for sensors such as car collision prevention sensors, rear monitor sensors, vehicle speed sensors, temperature sensors, security sensors, and motion sensors for game consoles; frame members and outer plate members for automobiles, motorcycles, bicycles, wheelchairs, etc.; panel members and mechanical parts for home televisions, PC displays, car-mounted monitors, smartphones, and head-mounted displays; housings and mechanical parts for reading devices such as barcode readers and scanners; housings and mechanical parts for air conditioners, air purifiers, compressors, etc.; housings and mechanical parts for information devices such as wired and wireless LAN routers, WIFI receivers, WIFI storage, USB memories, memory cards, card readers, and data server storage devices; manufacturing and processing equipment parts for optical devices, semiconductor package substrates, and semiconductor manufacturing equipment; and measuring instrument parts.

[0112] In particular, the molded article obtained from the polycarbonate resin composition of the present invention can be suitably used for optical device parts, and is suitably used for optical modules, particularly optical modules having a lens holding part, and is particularly suitably used for camera modules containing the molded article, such as lens barrels that constitute lens units, lens holders, spacers, stoppers, etc., and sleeves, pedestals, housings, etc. that constitute actuator units. EXAMPLES

[0113] The present invention will be described in more detail below with reference to examples, although the present invention should not be construed as being limited to the following examples.

[0114] The raw materials used in the following Examples and Comparative Examples are as shown in Table 1 below. [Table 1]

[0115] Example 2 ~4, Reference Example 1: Comparative Examples 1 to 7) [Production of resin composition pellets] The above-mentioned components were blended in the ratios shown in Table 2 (all parts by mass) and mixed uniformly in a tumbler mixer, and then fed from a hopper to an extruder for melt-kneading. The extruder used was a twin-screw extruder manufactured by Japan Steel Works, Ltd. ("TEX25αIII", L / D=52.5), and melt extrusion was performed under the conditions of a screw rotation speed of 200 rpm, a cylinder temperature of 280° C., and a discharge rate of 25 kg / hr. The extruded strand was quenched in a water bath and pelletized using a pelletizer.

[0116] The pellets obtained by the above manufacturing method were dried at 120°C for 5 hours, and then molded into 4 mm thick ISO dumbbell test specimens using a Nissei Plastic Industrial Co., Ltd. NEX80 injection molding machine under the following conditions: cylinder temperature 280°C, mold temperature 100°C, injection speed 30 mm / s, and holding pressure 90 MPa.

[0117] [Charpy impact strength (notched)] Using the ISO dumbbell specimen (thickness 4 mm) obtained above, the notched Charpy strength (unit: kJ / m 2 ) was measured.

[0118] [Measurement of heat resistance (temperature deflection under load, DTUL)] Using the ISO dumbbell specimens (thickness 4 mm) obtained above, the deflection temperature under load (DTUL, unit: ° C.) was measured under a load of 1.80 MPa based on the ISO 75 A method.

[0119] [Transmittance (%) measurement] The pellets obtained by the above manufacturing method were dried at 120°C for 4 hours, and then molded into a film having a thickness of 35 μm at a temperature of 240°C and a press pressure of 25 MPa using a press molding machine "Mini Test Press" manufactured by Toyo Seiki Co., Ltd. The spectral transmittance (unit: %) in the thickness direction of this film was measured at a wavelength of 700 nm using a Shimadzu UV-2700 ultraviolet-visible spectrophotometer with a C light source and a 2° visual field.

[0120] The above evaluation results are shown in the following Table 2. Note that the amount of carbon black (C1) in Table 2 is shown as the amount of carbon black, not as the amount as the master batch.

[0121] [Table 2] [Industrial Applicability]

[0122] INDUSTRIAL APPLICABILITY The polycarbonate resin composition of the present invention has extremely high light-shielding properties and excellent impact resistance, and therefore can be suitably used for various applications including optical equipment parts.

Claims

1. the composition contains, relative to 100 parts by mass of polycarbonate resin (A), more than 0.5 parts by mass and not more than 10 parts by mass of light diffusing agent (B) and more than 0.5 parts by mass and not more than 3 parts by mass of carbon black (C), the average particle size of the light diffusing agent (B) is 1.1 to 3.9 μm, and the content ratio (B) / (C) of the light diffusing agent (B) to the carbon black (C) is 1.5 or more, a spectral transmittance in the thickness direction measured on a 35 μm-thick film molded from the resin composition is 0.5% or less; A polycarbonate resin composition having a notched Charpy impact strength measured in accordance with ISO178 of 40 kJ / m 2 or more.

2. 2. The polycarbonate resin composition according to claim 1, wherein the absolute value of the difference between the refractive index n1 of the polycarbonate resin (A) and the refractive index n2 of the light diffusing agent (B), (|n1-n2|), is 0.12 or more.

3. 3. The polycarbonate resin composition according to claim 1, wherein the light diffusing agent (B) is a silicone-based light diffusing agent.

4. 4. The polycarbonate resin composition according to claim 1, wherein the light diffusing agent (B) is polymethylsilsesquioxane.

5. A molded article comprising the polycarbonate resin composition according to any one of claims 1 to 4.

6. An optical module comprising the molded article according to claim 5 .

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