Resin composition and molding of the same

Abstract

To provide a resin composition which is excellent in near infrared light transmittance.SOLUTION: A resin composition contains a polyarylate resin (A) containing a structure of formula (1), and a scaly glass (B), wherein (A) / (B) (mass ratio) is 60 / 40 to 90 / 10. In the formula (1), R1, R2, R3 and R4 are hydrogen, and hydrocarbon or halogen having 1 to 12 carbon atoms, and R5 and R6 are hydrogen, and hydrocarbon having 1 to 4 carbon atoms.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a resin composition and a molded article thereof. [Background technology]

[0002] Polyarylate resins, which are composed of aromatic dicarboxylic acid components and dihydric phenol components, are amorphous, transparent, and have excellent heat resistance, and are being used in a variety of applications. In particular, in the automotive and electrical / electronics fields, polyarylate resins are being considered for use in optical lens applications, such as substrate materials that require a reflow process, taking advantage of their excellent heat resistance. Heat resistance of 250°C or higher is required when reflowing with lead solder, and 200°C or higher when reflowing with low-temperature solder (lead-free). In particular, optical lens applications require not only heat resistance but also transparency, excellent dimensional stability, and low anisotropy to prevent distortion of lenses assembled in high-temperature environments.

[0003] A typical method for improving dimensional stability is to incorporate glass fibers or spherical silica. For example, Patent Document 1 discloses a resin composition incorporating glass fibers, which can be used for disk centering components of optical disk drives, etc. However, while resin compositions incorporating glass fibers improve dimensional stability in the orientation direction of the glass fibers, the effect is low in the direction perpendicular to the orientation direction, and anisotropy may occur. On the other hand, resin compositions incorporating spherical silica are used in various precision components such as lens components for digital cameras, lens components for camera-equipped mobile phones, and centering components for recording disks. However, transparency may be low.

[0004] As a method for achieving both dimensional stability and resin transparency, reducing the difference in refractive index between the resin and the glass filler has been investigated. For example, Patent Document 2 discloses that a resin composition with high total light transmittance can be obtained by reducing the difference in refractive index between an aliphatic polycarbonate resin and a glass filler for light of 486.1 nm, 589.3 nm, and 656.3 nm. However, aliphatic polycarbonate resins have low heat resistance, which can cause molded articles to deform during reflow treatment, limiting their applications. Furthermore, while aliphatic polycarbonate resins have high transmittance for light in the visible light region, they have low transmittance for light in the near-infrared region, so transmittance including that for light in the near-infrared region has been desired. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Application No. 2007-547923 [Patent Document 2] International Publication No. 2018 / 199033 Brochure Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a resin composition that is excellent in transparency, including transparency for light in the near-infrared region, reflow heat resistance, and dimensional stability, and that has low anisotropy.

[0007] As a result of extensive research into solving this problem, the present inventors have found that the above object can be achieved by using glass flakes in a polyarylate resin. [Means for solving the problem]

[0008] That is, the gist of the present invention is as follows. <1> A resin composition containing a polyarylate resin (A) and glass flakes (B), in which the (A) / (B) (mass ratio) is 60 / 40 to 90 / 10. <2> The polyarylate resin (A) is a polyarylate resin having a structure represented by chemical formula (1). <1> The resin composition according to claim 1. [ka] [In formula (1), R 1 , R 2 , R 3 and R 4 each independently represents hydrogen, a hydrocarbon group having 1 to 12 carbon atoms, or a halogen; R 5 and R 6 each independently represents hydrogen or a hydrocarbon group having 1 to 4 carbon atoms, m represents an integer of 4 to 7, and X represents carbon. <3> The glass flakes (B) have an average particle size of 1 to 200 μm, an average thickness of 5 μm or less, and an aspect ratio of 20 to 250. <1> or <2> The resin composition according to claim 1. <4> The difference in refractive index between the polyarylate resin (A) and the glass flakes (B) is 0.050 or less for light with a wavelength of 588 nm and 0.030 or less for light with a wavelength of 1014 nm. <1> ~ <3> The resin composition according to any one of the above. <5> The transmittance for light with wavelengths of 600 nm, 830 nm, 1014 nm, and 1550 nm is 70% or higher. <1> ~ <4> The resin composition according to any one of the above. <6> Deflection temperature under load (0.45 MPa) is 180°C or higher <1> The resin composition according to claim 1. <7> The average coefficient of linear expansion (CTE) at 20 to 80°C is 50 ppm / °C or less in both the machine direction (MD) and transverse direction (TD). <1> ~ <5> The resin composition according to any one of the above. <8> The difference in the average coefficient of linear expansion (CTE) between the machine direction (MD) and the transverse direction (TD) at 20 to 80°C is less than 5 ppm / °C <1> ~ <6> The resin composition according to any one of the above. <9> <1> ~ <8> A molded article obtained by molding the resin composition according to any one of claims 1 to 4. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a resin composition that is excellent in transparency, including transparency for light in the near-infrared region, reflow heat resistance, and dimensional stability, and has low anisotropy. The resin composition of the present invention can be suitably used for optical lenses and the like. DETAILED DESCRIPTION OF THE INVENTION

[0010] The resin composition of the present invention contains a polyarylate resin (A) and glass flakes (B).

[0011] In the present invention, the polyarylate resin (A) is an aromatic polyester resin obtained from an aromatic dicarboxylic acid component (including its derivatives) and a dihydric phenol component, and contains these components as monomer components. Therefore, the polyarylate resin of the present invention can also be expressed as containing residues of an aromatic dicarboxylic acid component and a dihydric phenol component.

[0012] The dihydric phenol component preferably contains a structure represented by chemical formula (1). [ka]

[0013] In chemical formula (1), R 1 , R 2 , R 3 and R 4 each independently represents hydrogen, a hydrocarbon group having 1 to 12 carbon atoms, or a halogen; R 5 and R 6 each independently represents hydrogen or a hydrocarbon group having 1 to 4 carbon atoms, m represents an integer of 4 to 7, and X represents carbon.

[0014] Examples of dihydric phenols that can introduce the structure represented by chemical formula (1) include 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane [bisphenol TMC], 1,1-bis-(4-hydroxyphenyl)-3,3,5,5-tetramethylcyclohexane, 1,1-bis-(4-hydroxyphenyl)-3,3,4-trimethylcyclohexane, 1,1-bis-(4-hydroxyphenyl)-3,3-dimethyl-5-ethylcyclohexane, 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclopentane, 1,1-bis-(3,5-dimethyl-4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, and 1,1-bis-(3,5-diphenyl-4-hydroxyphenyl)-3,3,5-trimethylcyclohexane. Examples of suitable bisphenol-TMC include 1,1-bis-(3-methyl-4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1,1-bis-(3-phenyl-4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1,1-bis-(3,5-dichloro-4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1,1-bis-(3,5-dibromo-4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1,1-bis-(3,5-diphenyl-4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1,1-bis(3-phenyl-4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1,1-bis(4-hydroxyphenyl)cyclohexane, and derivatives thereof. Among these, bisphenol-TMC is preferred due to its high versatility.

[0015] When a dihydric phenol incorporating the structure represented by chemical formula (1) is used, the content thereof is preferably 1 to 100 mass %, more preferably 20 to 100 mass %, even more preferably 40 to 100 mass %, and most preferably 100 mass %, based on the total amount of dihydric phenol components, from the viewpoints of improving transparency including transparency to light in the near-infrared region, reflow heat resistance, dimensional stability, and reducing anisotropy.

[0016] The dihydric phenol component may be different from the dihydric phenol that introduces the structure of chemical formula (1). Examples of the dihydric phenol component include 2,2-bis(4-hydroxyphenyl)propane (bisphenol A), 2,2-bis(3-methyl-4-hydroxyphenyl)propane (bisphenol C), 1,1-bis(4-hydroxyphenyl)cyclohexane (bisphenol Z), 1,1-bis(4-hydroxyphenyl)-1-phenylethane (bisphenol AP), 2,2-bis(4-hydroxy-3-methylphenyl)propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 2,2-bis(4-hydroxy-3,5-dibromophenyl)propane, Examples of suitable hydroxyl groups include 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane, 4,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl ketone, 4,4'-dihydroxydiphenylmethane, 4,4'-dihydroxybiphenyl [4,4'-biphenol], 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (bisphenol TMC), 4,4'-(1,3-dimethylbutylidene)diphenol, resorcinol, and derivatives thereof. These compounds may be used alone or in combination. Among them, bisphenol A, bisphenol C, bisphenol Z, and 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane are preferred, with bisphenol A being more preferred, from the viewpoints of improving transparency, including near-infrared light transparency, reflow heat resistance, dimensional stability, and reducing anisotropy.

[0017] Examples of aromatic dicarboxylic acid components include terephthalic acid, isophthalic acid, phthalic acid, chlorophthalic acid, nitrophthalic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, methyl terephthalic acid, 4,4'-biphenyldicarboxylic acid, 2,2'-biphenyldicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 4,4'-diphenylmethanedicarboxylic acid, 4,4'-diphenylsulfonedicarboxylic acid, 4,4'-diphenylisopropylidenedicarboxylic acid, 1,2-bis(4-carboxyphenoxy)ethane, 5-sodium sulfoisophthalic acid, diphenic acid, and derivatives thereof. From the viewpoints of improving transparency, including transparency to light in the near-infrared region, reflow heat resistance, dimensional stability, and reducing anisotropy, terephthalic acid and isophthalic acid are preferred. The mixing ratio (molar ratio) of terephthalic acid and isophthalic acid is preferably 90 / 10 to 10 / 90, more preferably 70 / 30 to 30 / 70, and even more preferably 50 / 50. If the ratio of terephthalic acid to the total of terephthalic acid and isophthalic acid is less than 10 mol% or exceeds 90 mol%, it may be difficult to obtain a sufficient degree of polymerization when polymerizing by interfacial polymerization.

[0018] The molecular weight of the polyarylate resin of the present invention may be adjusted by adding a terminal blocking agent. Examples of terminal blocking agents include monohydric phenols such as phenol, cresol, p-tert-butylphenol, 2,3,5-trimethylphenol, 2,3,6-trimethylphenol, and cumylphenol; monohydric acid chlorides such as benzoic acid chloride, methanesulfonyl chloride, and phenyl chloroformate; monohydric alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, 2-butanol, pentanol, hexanol, dodecyl alcohol, stearyl alcohol, benzyl alcohol, and phenethyl alcohol; and monohydric carboxylic acids such as acetic acid, propionic acid, octanoic acid, cyclohexanecarboxylic acid, benzoic acid, toluic acid, phenylacetic acid, p-tert-butylbenzoic acid, and p-methoxyphenylacetic acid. From the viewpoint of color tone, the terminal blocking agent is preferably a monohydric phenol (particularly p-tert-butylphenol).

[0019] The intrinsic viscosity of the polyarylate resin (A) is preferably 0.45 to 0.75, more preferably 0.48 to 0.72, and even more preferably 0.51 to 0.69. If the intrinsic viscosity exceeds 0.75, the melt viscosity increases, which may make injection molding difficult, and if the intrinsic viscosity is less than 0.45, the impact strength of the resulting molded article may be insufficient.

[0020] The refractive index of the polyarylate resin (A) is preferably 1.610 or less, more preferably 1.600 or less, even more preferably 1.590 or less, and even more preferably 1.580 or less, for light with a wavelength of 588 nm. The refractive index of the glass flakes (B) is preferably 1.590 or less, more preferably 1.580 or less, even more preferably 1.570 or less, and even more preferably 1.560 or less, for light with a wavelength of 1014 nm.

[0021] The method for producing the polyarylate resin (A) is not particularly limited and may be a known method, such as a solution polymerization method in which a dicarboxylic acid halide containing an aromatic dicarboxylic acid component is reacted with a diol containing a dihydric phenol component in an organic solvent, a melt polymerization method in which the dicarboxylic acid and diol are heated in the presence of acetic anhydride or diallyl carbonate, or an interfacial polymerization method in which a dicarboxylic acid halide dissolved in an organic solvent that is not miscible with water is mixed with a diol dissolved in an alkaline aqueous solution.

[0022] The glass flakes (B) used in the resin composition of the present invention are glass fillers that have a thin, scaly shape when observed under a microscope.

[0023] The average particle size of the glass flakes (B) is preferably 1 to 200 μm, more preferably 50 to 200 μm, and even more preferably 100 to 200 μm. The average thickness of the glass flakes (B) is preferably 5 μm or less, more preferably 3 μm or less, and even more preferably 1 μm or less. The aspect ratio (average particle size / average thickness) of the glass flakes (B) is preferably 20 to 250, more preferably 100 to 250, and even more preferably 200 to 250. The average particle size of the glass flakes (B) is the particle size value at 50% cumulative weight when the particle size distribution is measured using a particle size distribution measuring device such as a laser diffraction / scattering particle size distribution analyzer. The average particle size is measured, for example, by adding glass flakes to water or alcohol to a concentration acceptable for measurement, preparing a suspension, and dispersing the suspension using an ultrasonic disperser.

[0024] The refractive index of the glass flakes (B) for light with a wavelength of 588 nm is preferably 1.545 or more, more preferably 1.550 or more, even more preferably 1.555 or more, even more preferably 1.560 or more, and most preferably 1.565 or more. Also, the refractive index of the glass flakes (B) for light with a wavelength of 1014 nm is preferably 1.445 or more, more preferably 1.450 or more, even more preferably 1.455 or more, even more preferably 1.550 or more, and most preferably 1.555 or more.

[0025] The glass flakes (B) can be produced, for example, by inflating molten glass with a blow nozzle into a balloon-like shape to form a hollow glass film, and then pulverizing the hollow glass film with a pressure roll.

[0026] The glass flakes (B) may be surface-treated with a silane coupling agent to improve adhesion to the polyarylate resin (A).

[0027] Examples of commercially available glass flakes (B) include Fineflake (registered trademark) "MTG160FYX" and "MEG160FY-M01" and Fleca (registered trademark) "REFG-301" manufactured by Nippon Sheet Glass Co., Ltd.

[0028] The mass ratio (A / B) of the polyarylate resin (A) to the glass flakes (B) must be 60 / 40 to 90 / 10 from the viewpoints of improving transparency, including transparency to light in the near-infrared region, reflow heat resistance, dimensional stability, and reducing anisotropy, and from the viewpoint of improving fluidity, it is preferably 65 / 35 to 85 / 15, and more preferably 70 / 30 to 80 / 20.

[0029] In the present invention, from the viewpoint of transmittance, including transmittance for light in the near-infrared region, the difference in refractive index between the polyarylate resin (A) and the glass flakes (B) is preferably 0.050 or less, more preferably 0.040 or less, even more preferably 0.030 or less, even more preferably 0.020 or less, and most preferably 0.015 or less, for light with a wavelength of 588 nm; and is preferably 0.030 or less, more preferably 0.020 or less, even more preferably 0.015 or less, even more preferably 0.010 or less, and most preferably 0.005 or less, for light with a wavelength of 1014 nm.

[0030] The resin composition of the present invention can be produced by mixing the polyarylate resin (A) and the glass flakes (B) and melt-kneading them. Kneading methods include those using common extruders, such as single-screw extruders, twin-screw extruders, roll mixers, and Brabender mixers. Among these, the twin-screw extruder method is preferred because it ensures a good kneading state of the multiple raw materials. It is also preferred to use a static mixer or a dynamic mixer in combination. The raw materials may be added from a hopper or a side feeder, respectively. The resin composition obtained by melt-kneading is preferably in the form of pellets.

[0031] The resin composition of the present invention may contain additives that may be added to polyarylate resins, such as antioxidants, lubricants, dyes and pigments, flow improvers, and flame retardants. Examples of the antioxidant include various antioxidants such as hindered phenol-based, hindered amine-based, thioether-based, and phosphorus-based antioxidants. Examples of lubricants include fatty acid salts such as stearates. Examples of dyes and pigments include metal complex dyes, anthraquinone dyes, perinone dyes, inorganic pigments such as carbon black and inorganic metal pigments, and organic pigments containing organic compounds such as azo pigments and polycyclic pigments. Examples of flow improvers include inorganic compounds such as fatty acid salts, and organic compounds including fluorine-based and amide-based compounds. Examples of the flame retardant include various types of halogen-based, phosphorus-based, nitrogen-based, and hydrated metal-based flame retardants.

[0032] The content of the additive in the resin composition is not particularly limited, and may be, for example, 50% by mass or less, particularly 30% by mass or less, preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 0% by mass, relative to the polyarylate resin. When two or more additives are used, the total content thereof may be within the above range. The lower limit of the content of the additive is not particularly limited, and the content of the additive may be 0% by mass.

[0033] The resin composition of the present invention has excellent transmittance including the near-infrared region, reflow heat resistance, and dimensional stability, and has low anisotropy, and therefore can be suitably used for optical lenses. [Example]

[0034] The present invention will be specifically described below with reference to examples, but is not limited to these examples.

[0035] 1. Evaluation Method The physical properties were measured by the following methods. (1) Inherent viscosity (ηA) The resulting resin composition was thoroughly dissolved in tetrachloroethane solvent to prepare a solution with a resin component concentration of 1 g / dL. The prepared solution was filtered through a 0.45 μm fluororesin filter. Next, using an Ubbelohde viscometer, the falling times of the solution after filtering at 25°C to remove undissolved matter and the tetrachloroethane solvent alone were measured, and the inherent viscosity was calculated using the following formula. Inherent viscosity = [ln (drop test time of sample solution / drop time of solvent only)] / resin concentration (g / dL)

[0036] (2) Refractive index (Resin composition) The resin composition was injection molded using an injection molding machine (Japan Steel Works, Ltd., J30ADS) at a resin temperature of 360 to 400°C and a mold temperature of 130 to 180°C to produce a 70 x 40 mm wide, three-tiered plate (thicknesses of 3, 2, and 1 mm). A 3 mm section of the molded product was cut to a width of 20 mm, and the refractive index was measured using a Shimadzu Corporation, Kalnew Precision Refractive Index KPR-3000. (glass filler) The test pieces were measured in accordance with the immersion method of JIS K 7142:2014, Method B.

[0037] (3) Transmittance (transparency) The resin composition was injection molded using an injection molding machine (Japan Steel Works, Ltd., J30ADS) at a resin temperature of 360-400°C and a mold temperature of 130-180°C to produce square plates measuring 20 x 20 mm and 1 mm thick. Using the molded products, measurements were taken using a Hitachi High-Tech U-4000 spectrophotometer at a scan speed of 300 nm / min in the wavelength range of 600-850 nm and 120 nm / min in the wavelength range of 850-1550 nm. The higher the transmittance, the higher the transmittance. The transmittance was evaluated according to the following criteria. ◎: 79% or less transmittance (best) 〇:75%≦Transmittance<79% (Excellent) △: 70%≦Transmittance<75% (no practical problems) ×: 70% > transmittance (problems in practical use)

[0038] (4) Deflection temperature under load (heat resistance) The resin composition was injection molded using a Toshiba Machine EC100 injection molding machine at a resin temperature of 360 to 400°C and a mold temperature of 130 to 180°C to prepare dumbbell test pieces with a width of 10 mm and a thickness of 4 mm. Measurements were made in accordance with ISO 75-1 and -2 at a load of 0.45 MPa. A higher deflection temperature under load indicates higher heat resistance. The deflection temperature under load was evaluated according to the following criteria. ◎: 238℃≦ deflection temperature under load (best) 〇: 210≦heat deflection temperature<238℃ (excellent) △: The heat deflection temperature satisfies 180°C ≤ heat deflection temperature < 210°C (no practical problems). ×: The heat deflection temperature > 180°C (practical problems exist). [[ID=�]]

[0039] (5) Coefficient of thermal expansion (CTE) (dimension stability) The square flat plate obtained in (3) was cut into 10 × 5 mm using an EXAKT precision cutting device, diamond band saw 300CL. Using a TMA7100 manufactured by Hitachi High-Technologies Corporation, the temperature was raised from room temperature to 10 - 90°C at a rate of 5°C / min, and the CTEs in the machine direction (MD) and the transverse direction (TD) at 20 - 80°C were measured. A smaller CTE indicates better dimensional stability. The CTEs of MD and TD at 20 - 80°C were evaluated according to the following criteria. ◎: CTE ≥ 36 ppm / °C (best) 〇: 36 ppm / °C < CTE ≤ 40 ppm / °C (excellent) △: 40 ppm / °C < CTE ≤ 50 ppm / °C (no practical problems) ×: CTE > 50 ppm / °C (practical problems exist)

[0040] (6) Difference in CTE between MD and TD (anisotropy) (5) The difference in CTE between MD and TD obtained in (5) (|CTE MD - CTE TD |) was calculated. A smaller difference in CTE between MD and TD indicates lower anisotropy. The difference in CTE between MD and TD was evaluated according to the following criteria. ◎: 1% or less (best) 〇: Exceeding 1% and 3.5% or less (excellent)<于 △: Exceeding 3.5% and 5 or less (no practical problems)<于 ×: Exceeding 5% (practical problems exist)<于 <于

[0041] <于 (7) Flow length (fluidity)<于 The obtained resin composition was melted and flowed using an injection molding machine (J30ADS manufactured by The Japan Steel Works, Ltd.), and the bar flow length (mm) was measured. The measurement conditions were a cylinder temperature of 400°C, a mold temperature of 180°C, an injection pressure of 200 MPa, an injection time of 3 seconds, and a set injection speed of 200 mm / sec. A bar flow test mold with a width of 10 mm and a thickness of 0.5 mm was used. The longer the flow length, the better the fluidity. The flow length was evaluated according to the following criteria. ◎: 15mm or more (best); ○: 10mm or more and less than 15mm (excellent) △: 5mm or more but less than 10mm (excellent) ×: Less than 5mm (problems in practical use)

[0042] (6) Overall evaluation The lowest evaluation result among the evaluation results for transmittance, deflection temperature under load, linear expansion coefficient, difference in linear expansion coefficient between MD and TD, and flow length was used as the overall evaluation result.

[0043] 2.Raw materials (1) Polyarylate resin Production Example 1 [Polyarylate (a)] A reaction vessel equipped with a stirrer was charged with 100 parts by weight of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1.2 parts by weight of p-tert-butylphenol, 47 parts by weight of sodium hydroxide, 2.3 parts by weight of trimethylbenzylammonium chloride, and sodium hydrosulfite A (0.5% by weight relative to the weight of the dihydric phenol component). This was dissolved in 2304 parts by weight of water to form an aqueous layer. Separately, 66 parts by weight of a 1 / 1 mixture of terephthalic acid chloride and isophthalic acid chloride was dissolved in 1424 parts by weight of dichloromethane to form an organic layer. This organic layer was added to the previously prepared aqueous layer with vigorous stirring, and the polymerization reaction was carried out at 15°C for 2 hours. After this, the aqueous and organic layers were separated, and 10 parts by weight of acetic acid was added to the organic layer to terminate the reaction. The solution was then repeatedly washed with water until neutral, yielding a 17% by weight dichloromethane solution of polyarylate. The dichloromethane solution of polyarylate was granulated by a hot water granulation method, and the water and dichloromethane were thoroughly dried using a paddle-type hot air dryer at 120 to 135°C to obtain a polyarylate resin.

[0044] Production Examples 2 to 5 [Polyarylates (b) to (e)] A polyarylate resin was obtained by the same procedure as in Example 1, except that the composition of the bisphenol monomer in Production Example 1 was changed.

[0045] The composition and properties of the polyarylate resin obtained in the production example are shown in Table 1.

[0046] [Table 1]

[0047] (2) Glass filler Glass flakes (A): Fineflake (registered trademark) "MTG160FYX" manufactured by Nippon Sheet Glass Co., Ltd. (TA glass, average particle size 160 μm, average thickness 0.7 μm, aspect ratio 229) Glass flakes (B): Fine Flake (registered trademark) "MEG160FY-M01" manufactured by Nippon Sheet Glass Co., Ltd. (E glass, average particle size 160 μm, average thickness 0.7 μm, aspect ratio 229) Glass flakes (C): Nippon Sheet Glass Co., Ltd., Fleca (registered trademark) "REFG-301" (E glass, average particle size 160 μm, average thickness 5 μm, aspect ratio 32) Glass fiber: Denki Kagaku Kogyo Co., Ltd. "T-511" (average fiber diameter 13 μm, average length 3 mm) Spherical silica: Denki Kagaku Kogyo Co., Ltd. "FB-5SDC" (average particle size 5 μm)

[0048] Example 1 90 parts by mass of polyarylate resin and 10 parts by mass of flake glass (MTG160FYX) were melt-kneaded using a co-rotating twin-screw extruder (Toshiba Machine Co., Ltd., model number: TEM-37BS). The raw materials were fed from the top feeder of the extruder, and when a filler was added, a side feeder was used to feed only the filler midway through the extruder. The resin composition was drawn out in strand form from the nozzle, immersed in a water bath, cooled and solidified, cut with a pelletizer, and then dried with hot air at 120°C for 12 hours to obtain a resin composition (pellets). The extrusion conditions were 350-400°C and 300 rpm.

[0049] Examples 2 to 9, Comparative Examples 1 to 6 The same procedure as in Example 1 was carried out except that the raw materials were changed as shown in Table 1, to obtain a resin composition (pellet).

[0050] The resin composition and the properties of the resulting resin composition are shown in Table 2.

[0051] [Table 2]

[0052] The resin compositions of Examples 1 to 9 satisfied all of the requirements defined by the present invention, and all had a transmittance of 70% or more, a DTUL of 180°C or more, a CTE of 50% or less, and a difference in CTE between MD and TD of 5% or less, and therefore had excellent transparency, heat resistance, and dimensional stability, and low anisotropy.

[0053] The resin compositions of Comparative Examples 1 and 2 had a low CTE and poor dimensional stability because the blended amount of glass flakes was less than the range of the content specified in the present invention. The resin composition of Comparative Example 3 had a low transmittance and poor transparency because the blended amount of glass flakes was greater than the range of the content specified in the present invention. The resin composition of Comparative Example 4 did not use glass flakes, and therefore had low transmittance, poor transparency, a large difference in CTE between MD and TD, and high anisotropy. The resin composition of Comparative Example 5 did not use glass flakes, and therefore had low transmittance and poor transparency.

Claims

1. A resin composition containing a polyarylate resin (A) and glass flakes (B), in which the (A) / (B) (mass ratio) is 60 / 40 to 90 / 10.

2. 2. The resin composition according to claim 1, wherein the polyarylate resin (A) is a polyarylate resin having a structure represented by chemical formula (1). 【Chemistry 1】 [In formula (1), R １ , R ２ , R ３ and R ４ each independently represents hydrogen, a hydrocarbon group having 1 to 12 carbon atoms, or a halogen; R ５ and R ６ each independently represents hydrogen or a hydrocarbon group having 1 to 4 carbon atoms, m represents an integer of 4 to 7, and X represents carbon.

3. 2. The resin composition according to claim 1, wherein the glass flakes (B) have an average particle size of 1 to 200 μm, an average thickness of 5 μm or less, and an aspect ratio of 20 to 250.

4. The difference in refractive index between the polyarylate resin (A) and the glass flakes (B) is is 0.050 or less for light with a wavelength of 588 nm, The resin composition according to claim 1, which has a reflectance of 0.030 or less for light having a wavelength of 1014 nm.

5. 2. The resin composition according to claim 1, which has transmittance of 70% or more for light having a wavelength of 600 nm, 830 nm, 1014 nm, and 1550 nm.

6. The resin composition according to claim 1, which has a deflection temperature under load (0.45 MPa) of 180°C or higher.

7. 2. The resin composition according to claim 1, wherein the average coefficient of linear expansion (CTE) at 20 to 80° C. is 50 ppm / ° C. or less in both the machine direction (MD) and the transverse direction (TD).

8. 2. The resin composition according to claim 1, wherein the difference in average coefficient of linear expansion (CTE) between the machine direction (MD) and the transverse direction (TD) at 20 to 80°C is less than 5 ppm / °C.

9. A molded article obtained by molding the resin composition according to any one of claims 1 to 8.

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