JP2016147962A - Polyester resin composition for camera module, and camera module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyester resin composition for a camera module, which is excellent in heat resistance, surface smoothness, dimensional stability (especially, dimensional change due to moisture absorption), and releasing property from a metallic mold and which can be molded into a camera module member having high dimensional accuracy.SOLUTION: The polyester resin composition for a camera module is provided that contains a polyester resin (A) having a melting point or a glass transition temperature of 250°C or higher, a copolymer (B) which has an olefin-derived structural unit and an aromatic hydrocarbon structure, and has intrinsic viscosity [η] measured at 135°C in decalin of 0.04 to 1.0dl/g, and carbon black (C); and contains no polymer containing a structural unit having a cyclic oxy hydrocarbon structure.SELECTED DRAWING: None

Description

  The present invention relates to a polyester resin composition for a camera module and a camera module.

  The camera module is an electronic component having a camera function in which a lens is assembled on a CCD (charge coupled device) / CMOS (complementary metal oxide semiconductor) imaging device (image sensor). The camera module is mounted on a mobile phone, a laptop computer, a digital camera, a digital video camera, and the like. In a camera module equipped with a general fixed focus optical system, a CMOS image sensor is mounted on a signal processing chip. Further, one or more lenses for forming an optical image on the image sensor, a barrel for holding the lens, a holder for holding the barrel, a substrate for holding the image sensor, etc. (See FIG. 1).

  In order to reduce the size of portable electronic devices and reduce the cost of the mounting process of electronic devices, or to reduce process time, barrels and holders need to be compatible with reflow soldering. For this reason, the material for the barrel and the holder needs to have a heat resistance exceeding 250 ° C. Furthermore, materials having excellent mechanical properties and moldability are required, and currently, polyester resin compositions (for example, Patent Documents 1 and 2) and semi-aromatic polyamides using long-chain diamines (for example, Patent Document 3) are mainly used. It has become. In addition, from the viewpoint of further improving mechanical properties, a copolymer having an olefin-derived structural unit, a structural unit derived from an α, β-unsaturated carboxylic acid alkyl ester, and a structural unit derived from an α, β-unsaturated carboxylic acid glycidyl ester. A polyester resin composition to which a coalescence has been added has also been proposed (for example, Patent Document 4).

JP 2012-87171 A JP 2009-242456 A JP 2010-286544 A International Publication No. 2014/076971

  By the way, in the assembly process of the camera module, manual focus adjustment of the optical component system (the lens barrel part screwed to the mount holder part with a screw is screwed, the distance between the lens and the image sensor is changed, and the focal length is optimized. Adjustment). During the adjustment, the resin composition powder (particles) may fall off from the component surface. When such particles get on the CMOS sensor, they cause image defects, and they adhere to the surface of the image sensor or the lens surface, resulting in black scratches or spots, resulting in a reduction in camera performance. Due to the improvement in the number of pixels accompanying the higher performance of the camera, even a small foreign object of less than 1 μm may cause image defects. In order to reduce the generation of such particles, it is desired that the lens barrel portion has high surface smoothness.

  In addition, a lens is mounted on a barrel which is a constituent member of the camera module, and the holder is often screwed by a barrel and a screw. Therefore, both the barrel and the holder are required to have high dimensional accuracy at the time of manufacturing. Further, it is also required that the dimensional change caused by the influence of temperature, humidity, etc. is small (high dimensional stability) and that the dimensional change does not change greatly with the direction (low anisotropy).

  In recent years, higher dimensional stability (particularly dimensional stability due to moisture absorption) is required for barrels and holders in order to meet the further increase in the number of processed pixels. Therefore, the conventional liquid crystalline polyester resin and semi-aromatic polyamide have a problem that they cannot meet these requirements.

  In addition, the barrel and the holder are required to shield light having a wavelength in the vicinity of visible light in order to prevent transmission of ambient light.

  According to the study by the present inventors, it has been found that the semi-aromatic polyamide using a long-chain diamine does not have sufficient dimensional stability (particularly dimensional change accompanying moisture absorption) and surface smoothness and needs further improvement. It was. Further, the polyester resin composition is required to further improve the dimensional accuracy of the molded product, and for this purpose, it is required to improve the fluidity at the time of heating and melting and the releasability from the mold.

  Therefore, the present invention can be formed into a camera module member having good dimensional stability (particularly dimensional change due to moisture absorption), surface smoothness and mold releasability, and has good fluidity when heated and melted. A polyester resin composition for modules is provided. Moreover, the camera module containing this resin composition is provided.

[1] Polyester resin (A) having a melting point or glass transition temperature of 250 ° C. or higher, an olefin-derived structural unit and an aromatic hydrocarbon structure, and an intrinsic viscosity [η] measured at 135 ° C. in decalin A polyester resin for a camera module, which contains a copolymer (B) of 0.04 to 1.0 dl / g and carbon black (C), and does not contain a polymer containing a structural unit having a cyclic oxyhydrocarbon structure. Composition.
[2] The polyester resin composition for camera modules according to [1], further including a fibrous reinforcing material (D).
[3] 35 to 78 parts by mass of the polyester resin (A), 0.5 to 5 parts by mass of the copolymer (B), 0.1 to 5 parts by mass of the carbon black (C), and the fibrous form (20) 55 to 55 parts by mass of reinforcing material (D) (however, the sum of (A), (B), (C) and (D) is 100 parts by mass), for the camera module according to [2] Polyester resin composition.
[4] A dicarboxylic acid component unit in which the polyester resin (A) includes 30 to 100 mol% of a dicarboxylic acid component unit derived from terephthalic acid and 0 to 70 mol% of an aromatic dicarboxylic acid component unit other than terephthalic acid. The polyester resin for camera modules according to any one of [1] to [3], comprising (a1) and a dialcohol component unit (a2) containing an alicyclic dialcohol component unit having 4 to 20 carbon atoms. Composition.
[5] The polyester resin composition for camera modules according to [4], wherein the dialcohol component unit (a2) contained in the polyester resin (A) includes a component unit having a cyclohexane skeleton.
[6] The polyester resin composition for camera modules according to [2] or [3], wherein the fibrous reinforcing material (D) is at least one selected from wollastonite and potassium titanate.
[7] A camera module comprising the polyester resin composition according to any one of [1] to [6].

  The present invention provides a polyester for a camera module that can give a molded article having good dimensional stability (particularly dimensional change due to moisture absorption), surface smoothness and mold releasability, and good fluidity when heated and melted. A resin composition can be provided. Therefore, the molded article of the polyester resin composition of the present invention is suitably used as a constituent member of a camera module, particularly as a constituent material of a barrel or a holder.

It is a figure which shows the outline | summary of a camera module. It is a graph which shows the temperature profile of a reflow process.

  The present inventors include a polyester resin (A) and a polymer containing a structural unit having a cyclic oxyhydrocarbon structure, including a structural unit derived from an olefin and a copolymer (B) having an aromatic hydrocarbon structure. It has been found that a molded product of a resin composition not containing a resin has mechanical properties (strength / toughness) necessary for a camera module, and has high dimensional stability, surface smoothness and releasability.

  The reason for this is not necessarily clear, but is considered as follows. The polyester resin (A) can improve the dimensional stability and surface smoothness of the molded product as compared with the polyamide resin, but the release property is low. Since the copolymer (B) has an aromatic hydrocarbon structure, it is easily compatible with the polyester resin (A), and appropriately leaches out on the surface of the resin composition during molding to form a thin film. The releasability of objects can be improved.

  Furthermore, the fluidity | liquidity of the resin composition at the time of heat-melting and the mold release property of a molded object are improved more by not including the polymer containing the structural unit which has a cyclic oxyhydrocarbon structure. As a result, a molded product with high dimensional accuracy can be obtained.

1. Polyester resin composition for camera module The polyester resin composition for a camera module of the present invention includes a polyester resin (A), a copolymer (B), and carbon black (C), and if necessary, fibrous reinforcement The material (D) may further be included. In addition, the polyester resin composition for camera modules of this invention does not contain the polymer containing the structural unit which has a cyclic oxyhydrocarbon structure.

1-1. Polyester resin (A)
The polyester resin (A) contained in the polyester resin composition for a camera module of the present invention may be a non-liquid crystalline polyester resin or a liquid crystalline polyester resin, from the viewpoint of easily suppressing the generation of particles. A non-liquid crystalline polyester resin is preferable.

  The non-liquid crystalline polyester resin is a polyester resin that does not exhibit molten liquid crystallinity. The melt liquid crystallinity refers to a characteristic showing optical anisotropy (liquid crystallinity) in the melt phase. The molded product of the liquid crystalline polymer is likely to be fibrillated and may easily generate fine particles such as particles. On the other hand, a molded product of a resin composition containing a non-liquid crystalline polyester resin is less likely to generate fine particles such as particles because fibrillation is suppressed.

  The polyester resin (A) has a structure having a dicarboxylic acid component unit (a1) containing a component unit derived from an aromatic dicarboxylic acid and a dialcohol component unit (a2) containing a component unit derived from a dialcohol having an alicyclic skeleton. It is preferable that

  The dicarboxylic acid component unit (a1) constituting the polyester resin (A) comprises 30 to 100 mol% of terephthalic acid component units, 0 to 70 mol% of aromatic dicarboxylic acid component units other than terephthalic acid, and 4 to 4 carbon atoms. 20 aliphatic dicarboxylic acid component units are preferably 0 to 70 mol% (here, the total amount of dicarboxylic acid component units (a1) is 100 mol%).

  The dicarboxylic acid component unit (a1) is preferably 40 to 100 mol% of terephthalic acid component units, preferably 0 to 60 mol% of aromatic dicarboxylic acid component units other than terephthalic acid, and 4 to 20 carbon atoms ( Preferably, it contains 6 to 12) aliphatic dicarboxylic acid component units, preferably 0 to 60 mol% (the total amount of dicarboxylic acid component units (a1) is 100 mol%).

  Examples of the terephthalic acid component unit include terephthalic acid and its derivatives (for example, 2-methyl terephthalic acid). Examples of aromatic dicarboxylic acid component units other than terephthalic acid include units derived from isophthalic acid, naphthalenedicarboxylic acid, and combinations thereof. The aliphatic dicarboxylic acid component unit is not particularly limited in the number of carbon atoms, but is a unit derived from an aliphatic dicarboxylic acid having 4 to 20 carbon atoms, preferably 6 to 12 carbon atoms. Examples of the aliphatic dicarboxylic acid from which the aliphatic dicarboxylic acid component unit is derived include adipic acid, suberic acid, azelaic acid, sebacic acid, decanedicarboxylic acid, undecanedicarboxylic acid, dodecanedicarboxylic acid and the like.

  The dicarboxylic acid component unit (a1) constituting the polyester resin (A) may contain a component unit derived from an alicyclic dicarboxylic acid such as cyclohexanedicarboxylic acid.

  The dicarboxylic acid component unit (a1) may further contain a small amount, for example, an amount of about 10 mol% or less of the polyvalent carboxylic acid component unit together with the above structural unit. Specific examples of such polyvalent carboxylic acid component units include tribasic acids and polybasic acids such as trimellitic acid and pyromellitic acid.

  On the other hand, the dialcohol component unit (a2) constituting the polyester resin (A) preferably contains an alicyclic dialcohol component unit. The alicyclic dialcohol component unit preferably includes a component unit derived from dialcohol having an alicyclic hydrocarbon skeleton having 4 to 20 carbon atoms. Examples of dialcohols having an alicyclic hydrocarbon skeleton include 1,3-cyclopentanediol, 1,3-cyclopentanedimethanol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, and 1,4. -Cycloheptanediol, alicyclic dialcohols such as 1,4-cycloheptanedimethanol are included. Among these, from the viewpoint of heat resistance, water absorption, availability, etc., a component unit derived from a dialcohol having a cyclohexane skeleton is preferable, and a component unit derived from cyclohexanedimethanol is more preferable.

  The ratio of the alicyclic dialcohol component unit (preferably the dialcohol component unit having a cyclohexane skeleton) to the dialcohol component unit (a2) is preferably 60 to 100 mol% (the dialcohol component unit (a2)). ) Is 100 mol%).

  The alicyclic glycol has isomers such as cis / trans, but the trans structure is preferred from the viewpoint of heat resistance. Accordingly, the cis / trans ratio is preferably 50/50 to 0/100, more preferably 40/60 to 0/100.

  The dialcohol component unit (a2) may further contain an aliphatic dialcohol component unit in addition to the alicyclic dialcohol component unit. The aliphatic dialcohol component unit can improve the melt fluidity of the polyester resin (A). Specific examples of the aliphatic dialcohol component unit include ethylene glycol, trimethylene glycol, propylene glycol, tetramethylene glycol, neopentyl glycol, hexamethylene glycol, dodecamethylene glycol and the like.

  The melting point (Tm) or glass transition temperature (Tg) of the polyester resin (A) measured by a differential scanning calorimeter (DSC) is 250 ° C. or higher. A preferred lower limit is 270 ° C, more preferably 280 ° C. On the other hand, a preferable upper limit value may be 350 ° C, and more preferably 335 ° C. When the melting point or glass transition temperature is 250 ° C. or higher, deformation of the molded product during reflow soldering and generation of blisters are suppressed, or heat resistance when used as a base material for applications involving a heat treatment process at high temperatures. Excellent in mechanical properties (mechanical properties, shape stability). The upper limit temperature is not limited in principle, but a melting point or glass transition temperature of 350 ° C. or lower is preferable because decomposition of the polyester resin (A) can be suppressed during melt molding.

  The melting point of the polyester resin (A) can be measured according to JIS-K7121. Specifically, a pan for DSC measurement in which a sample of the polyester resin (A) is enclosed is set in a measuring apparatus X-DSC7000 (manufactured by SII), and the temperature is increased at 320 ° C./minute in a nitrogen atmosphere at 320 ° C./min. After raising the temperature to 0 ° C. and holding at that temperature for 5 minutes, the temperature is lowered to 30 ° C. by measuring the temperature drop at 10 ° C./min. The temperature at the top of the endothermic peak at the time of temperature rise is defined as the “melting point”.

  The intrinsic viscosity [η] of the polyester resin (A) is preferably 0.3 to 1.0 dl / g. When the intrinsic viscosity is in such a range, the fluidity during molding of the polyester resin composition can be excellent. The intrinsic viscosity of the polyester resin (A) can be adjusted by adjusting the molecular weight of the polyester resin (A). As a method for adjusting the molecular weight of the polyester resin, a known method such as a degree of progress of the polycondensation reaction, an appropriate amount of a monofunctional carboxylic acid, a monofunctional alcohol, or the like can be employed.

The intrinsic viscosity of the polyester resin (A) is obtained by dissolving the polyester resin (A) in a 50/50 mass% mixed solvent of phenol and tetrachloroethane and using an Ubbelohde viscometer under the conditions of 25 ° C. ± 0.05 ° C. Measure the number of seconds that the sample solution flows down, and the value is calculated by the following formula.
[Η] = ηSP / [C (1 + 0.205ηSP)]
[Η]: Intrinsic viscosity (dl / g)
ηSP: specific viscosity C: sample concentration (g / dl)
t: Number of seconds that the sample solution flows (seconds)
t0: The number of seconds during which the solvent flows (seconds)
ηSP = (t−t0) / t0

  The polyester resin (A) content in the polyester resin composition for camera modules is 100 parts by mass of the total amount of the polyester resin (A), the copolymer (B), the carbon black (C), and the fibrous reinforcing material (D). Is preferably 35 to 83 parts by mass, more preferably 35 to 78 parts by mass, and still more preferably 35 to 75 parts by mass.

  Moreover, the polyester resin composition for camera modules may contain the polyester resin (A) from which several physical properties differ as needed. Further, other thermoplastic resins may be included within the scope of the object of the present invention.

1-2. Copolymer (B)
The copolymer (B) contained in the polyester resin composition for camera modules of the present invention is a copolymer having an olefin-derived structural unit and an aromatic hydrocarbon structure. The copolymer (B) can impart good release properties to the resin composition while being well compatible with the polyester resin (A).

  The intrinsic viscosity [η] measured at 135 ° C. in decalin of the copolymer (B) is 0.04 to 1.0 dl / g. The preferable lower limit of this intrinsic viscosity is 0.05 dl / g, more preferably 0.07 dl / g. On the other hand, the preferable upper limit is 0.5 dl / g, more preferably 0.2 dl / g. When the intrinsic viscosity is 0.04 dl / g or more, excessive bleeding out of the copolymer (B) from the polyester resin composition for camera modules can be suppressed, and further, odor and smoke generation can be suppressed during the molding process. On the other hand, when the intrinsic viscosity is 1.0 dl / g or less, the melt viscosity of the resin composition is hardly increased excessively, and the moldability is hardly impaired.

  The melt viscosity (mPa · s) at 140 ° C. of the copolymer (B) is preferably 10 to 2000 mPa · s, more preferably 20 to 1500 mPa · s, and more preferably 30 to 1200 mPa · s. Particularly preferred. If the melt viscosity at 140 ° C. of the copolymer (B) is 10 mPa · s or more, not only can the bleed out of the copolymer (B) from the resin composition be suppressed, but also odor and fumes are generated during the molding process. Not likely to occur. On the other hand, when the melt viscosity at 140 ° C. of the copolymer (B) is 2000 mPa · s or less, the melt viscosity of the resin composition does not increase excessively and the moldability is hardly impaired. The viscosity can be measured with a Brookfield viscometer.

  The copolymer (B) is usually a vinyl compound having an aromatic hydrocarbon structure typified by styrene and the like, and a wax referred to as a polyolefin wax (hereinafter sometimes referred to as a polyolefin wax (e)). Is obtained in the presence of a radical generator such as nitrile or peroxide. Such a copolymer (B) may be referred to as a so-called modified wax.

  The copolymer (B) is 1 to 900 parts by weight, more preferably 10 to 300 parts by weight of a vinyl compound having an aromatic hydrocarbon structure such as styrene, particularly with respect to 100 parts by weight of the polyolefin wax (e). Particularly preferably, 20 to 200 parts by mass are introduced. That is, the content of the aromatic hydrocarbon structure of the copolymer (B) is from 1 to 90% by mass, preferably from 10 to 75% by mass, more preferably from all the structural units constituting the copolymer (B). It is 20-67 mass%.

  When the content of the aromatic hydrocarbon structure is a certain level or more, good compatibility with the polyester resin (A) is easily obtained, and the melt viscosity of the resin composition is easily lowered (injection fluidity is improved). On the other hand, when the content ratio of the aromatic hydrocarbon structure is below a certain level, the releasability is hardly impaired and the odor is easily suppressed.

  The content of the aromatic hydrocarbon structure of the copolymer (B) is determined by the preparation ratio of the polyolefin wax (e) and the vinyl compound having an aromatic hydrocarbon structure at the time of preparation, nuclear magnetic resonance spectrum analysis of 100 to 600 MHz class. It can be identified by conventional methods such as structure identification by apparatus (NMR), ratio of absorption intensity between phenyl structure carbon and other carbon, and ratio of absorption intensity between phenyl structure hydrogen and other carbon. Of course, infrared absorption spectrum analysis or the like can also be used in combination for structure identification.

Specific conditions for NMR measurement include the following conditions.
^In the case of ¹ H NMR measurement, an ECX400 type nuclear magnetic resonance apparatus manufactured by JEOL Ltd. is used, the solvent is deuterated orthodichlorobenzene, the sample concentration is 20 mg / 0.6 mL, the measurement temperature is 120 ° C., the observation nucleus is ¹ H (400 MHz), the sequence is a single pulse, the pulse width is 5.12 μs (45 ° pulse), the repetition time is 7.0 seconds, and the number of integration is 500 times or more. The standard chemical shift is 0 ppm for tetramethylsilane hydrogen. For example, the same result can be obtained by setting the peak derived from residual hydrogen in deuterated orthodichlorobenzene to 7.10 ppm and setting the standard value for chemical shift. I can do it. Peaks such as ¹ H derived from the functional group-containing compound were assigned by a conventional method.

^In the case of ¹³ C NMR measurement, the measuring device is an ECP500 type nuclear magnetic resonance device manufactured by JEOL Ltd., a mixed solvent of orthodichlorobenzene / heavy benzene (80/20 vol%) as a solvent, a measurement temperature is 120 ° C., and an observation nucleus is ¹³ C (125 MHz), single pulse proton decoupling, 45 ° pulse, repetition time is 5.5 seconds, integration number is 10,000 times or more, and 27.50 ppm is a standard value for chemical shift. Assignment of various signals is performed based on a conventional method, and quantification can be performed based on an integrated value of signal intensity.

  As another method for measuring the content of the functional group structural unit, the functional group content of polymers having different functional group contents is determined by the NMR measurement, and infrared spectroscopy ( IR) measurement is performed, a calibration curve is created based on the intensity ratio of a specific peak, and the functional group content is determined based on this result. This method is simpler than the NMR measurement described above, but basically it is necessary to prepare a corresponding calibration curve depending on the type of base resin and functional group. For this reason, this method is preferably used for process management in resin production at a commercial plant, for example.

  Examples of the vinyl compound having an aromatic hydrocarbon structure include styrene, α-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene and the like. Among these, styrene is preferable.

  Examples of the polyolefin wax (e) include homopolymers of α-olefins such as ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-decene, or two or more α-olefins. And ethylene wax, propylene wax, 4-methyl-1-pentene wax and the like. Among these, an ethylene-based wax mainly composed of ethylene is preferable.

  The number average molecular weight of the polyolefin wax (e) is preferably 400 to 12000, more preferably 500 to 5000, and particularly preferably 600 to 2000. When the molecular weight of the polyolefin wax (e) is a certain value or more, bleeding out of the copolymer (B) from the resin composition can be suppressed. On the other hand, when the molecular weight is below a certain level, an excessive increase in the melt viscosity of the resin composition can be suppressed.

The number average molecular weight of the polyolefin wax (e) can be determined by GPC measurement under the following conditions.
Apparatus: Gel permeation chromatograph Alliance GPC2000 (manufactured by Waters)
Solvent: o-dichlorobenzene Column: TSKgel column (manufactured by Tosoh Corporation) x 4
Flow rate: 1.0 ml / min Sample: 0.15 mg / mL o-dichlorobenzene solution Temperature: 140 ° C.
Calibration curve: Prepared using commercially available monodisperse standard polystyrene.
Molecular weight conversion: PE conversion / General calibration method

In addition, the following coefficient of the Mark-Houwink viscosity formula shown below can be used for calculation of general-purpose calibration.
Coefficient of polystyrene (PS): KPS = 1.38 × 10 ⁻⁴ , aPS = 0.70
Coefficient of polyethylene (PE): KPE = 0.06 × 10 ⁻⁴ , aPE = 0.70

  The polyolefin wax (e) is obtained, for example, by polymerizing a corresponding olefin at a low pressure or an intermediate pressure. Examples of the polymerization catalyst used for the polymerization include JP-A-57-63310, JP-A-58-83006, JP-A-3-706, JP-A-3476793, JP-A-4-218508, Magnesium-supported titanium catalysts described in JP 2003-105022 A, etc., WO 01/53369, WO 01/27124, JP 3-19396 A, or JP 2-41303 A. A transition metal-containing olefin polymerization catalyst represented by a metallocene catalyst described in a gazette or the like as a representative example is preferably used. The polyolefin wax (e) can also be obtained by thermally decomposing or radically decomposing a corresponding olefin polymer such as polyethylene or polypropylene.

  As a method for obtaining the copolymer (B), the polyolefin wax (e) is reacted with a vinyl compound having an aromatic hydrocarbon structure in the presence of a radical generator such as nitrile or peroxide. A method of thermally decomposing or radically decomposing these components in the presence of the above-mentioned olefin polymer and a polymer of an aromatic vinyl compound such as polystyrene is also a suitable example. Thermal decomposition reaction and radical decomposition reaction are expected to be accompanied by recombination reaction, although decomposition reaction is dominant. For this reason, if such a method is used, it is also possible to introduce an aromatic structure into the polyolefin skeleton.

  The content of the copolymer (B) is preferably 1.0 to 8.7 parts by mass, and 1.6 to 6.8 parts by mass with respect to 100 parts by mass of the polyester resin (A). More preferred. By setting the content of the copolymer (B) to a certain level or more, good release properties can be imparted to the resin composition. By setting the content of the copolymer (B) to a certain value or less, it is possible to highly suppress the appearance defect of the molded product and the decrease in mechanical strength due to bleed-out, and further suppress mold contamination during molding.

  The content of the copolymer (B) in the polyester resin composition for camera modules is 100 mass of the total amount of the polyester resin (A), the copolymer (B), the carbon black (C), and the fibrous reinforcing material (D). The amount is preferably 0.5 to 5.0 parts by mass, more preferably 0.5 to 3.0 parts by mass with respect to parts.

1-3. Carbon black (C)
The kind of carbon black (C) contained in the polyester resin composition for camera modules of the present invention is not particularly limited, and those generally available for resin coloring can be used. Examples of commercially available products include “# 980B” manufactured by Mitsubishi Chemical Corporation and “REGAL99I” manufactured by Cabot Corporation.

  The content of carbon black in the polyester resin composition for camera modules is based on 100 parts by mass of the total amount of the polyester resin (A), copolymer (B), carbon black (C), and fibrous reinforcing material (D). The content is more preferably 0.1 to 5.0 parts by mass, and still more preferably 0.8 to 2.0 parts by mass. When carbon black is contained in a certain amount or more, a camera module constituent member having further excellent light shielding properties can be obtained. Therefore, it is possible to prevent external light from leaking into the image sensor of the camera module through the camera module constituent member. On the other hand, if the content of carbon black is too high, the moldability of the resin composition may decrease, or the insulating properties and mechanical characteristics of the molded product may decrease.

1-4. Fibrous reinforcement (D)
Examples of the fibrous reinforcing material (D) contained in the polyester resin composition for a camera module of the present invention include glass fiber, wollastonite, potassium titanate whisker, calcium carbonate whisker, aluminum borate whisker, magnesium sulfate whisker, Sepiolite, zonotlite, zinc oxide whisker, milled fiber, cut fiber and the like are included. One of these may be used alone, or two or more may be used in combination. Among these, at least one selected from the group consisting of wollastonite and potassium titanate whiskers is preferable. This is because wollastonite and potassium titanate whiskers have a relatively small fiber diameter. In order to increase the surface smoothness of the molded product, it is preferable to reduce the size of the fibrous reinforcing material (D) to be used as much as possible, and it is particularly desirable that the fiber diameter is small. One of the factors that deteriorate the surface smoothness of the molded product is the difference in shrinkage between the resin component and the fibrous reinforcement. If the fiber diameter of the fibrous reinforcement is small, the surface smoothness tends not to be impaired. Show.

  The average fiber length of the fibrous reinforcing material (D) contained in the polyester resin composition for a camera module before melt kneading is preferably 3 mm or less, more preferably 300 μm or less, and 100 μm or less. More preferably, it is particularly preferably 50 μm or less. When the average fiber length is 3 mm or less, the dimensional stability of the molded article of the polyester resin composition for camera modules is increased. Furthermore, when the average fiber length is 50 μm or less, the anisotropy of the dimensional change of the molded product can be further reduced. The fibrous reinforcing material (D) having a fiber length of a certain length or less is easy to block heat uniformly, and for example, it is easy to give a molded product with high mechanical strength by suppressing thermal deterioration of the polyester resin (A) during molding. it is conceivable that. The anisotropy of dimensional change is the ratio of the dimensional change rate MD and the dimensional change rate TD, and the closer to 1.0, the lower the anisotropy. Furthermore, the surface smoothness is increased. Moreover, generation | occurrence | production of the particle from the molding of the polyester resin composition for camera modules is suppressed. Moreover, there is no restriction | limiting in particular in the lower limit of the said average fiber length, For example, it is 0.1 micrometer.

  The average fiber diameter before melt kneading of the fibrous reinforcement (D) is 100 μm or less from the viewpoint of facilitating fine dispersion of the fibrous reinforcement (D) during molding and enhancing the surface smoothness of the molded product. Is more preferable, it is more preferable that it is 0.05-18 micrometers, and it is still more preferable that it is 2-6 micrometers. By setting the average fiber diameter to a certain value or more, it is possible to suppress the fibrous reinforcing material (D) from being broken during molding. By setting the average fiber diameter to a certain value or less, high surface smoothness can be imparted to the molded product.

The average fiber length and average fiber diameter of the fibrous reinforcing material (D) before melt-kneading can be measured by the following methods. A fibrous reinforcing material is dispersed in water, and an arbitrary 300 fiber length (Li) and fiber diameter (di) are measured with an optical microscope (magnification: 50 times). The number of fibers having a fiber length of Li is defined as qi, the weight average length (Lw) is calculated based on the following formula, and this is defined as the average fiber length of the fibrous reinforcing material.
Weight average length (Lw) = (Σqi × Li ² ) / (Σqi × Li)
Similarly, the number of fibers having a fiber diameter Di is set to ri, and the weight average diameter (Dw) is calculated based on the following formula, which is set as the average fiber diameter of the fibrous reinforcing material.
Weight average diameter (Dw) = (Σri × Di ² ) / (Σri × Di)

  The average fiber length and average fiber diameter of the fibrous reinforcing material (D) in the resin composition or molded product are usually the average fiber length of the fibrous reinforcing material (D) in the polyester resin composition before melt kneading. It can be approximately the same as the average fiber diameter.

The average fiber length and average fiber diameter of the fibrous reinforcing material (D) in the resin composition or molded product can be measured in the same manner as described above. That is,
1) A resin composition or a molded product is dissolved in a hexafluoroisopropanol / chloroform solution (0.1 / 0.9% by volume), and then a filtrate is obtained by filtration.
2) The average fiber length and average fiber diameter of any 300 fibrous reinforcing materials (D) out of the filtrate obtained in 1) are calculated by the same method as described above.

  The aspect ratio (average fiber length / average fiber diameter) of the fibrous reinforcing material (D) is preferably 1 to 500, and more preferably 5 to 350.

  The content of the fibrous reinforcing material (D) in the polyester resin composition for camera modules is the total amount of the polyester resin (A), the copolymer (B), the carbon black (C), and the fibrous reinforcing material (D) 100. The amount is preferably 15 to 55 parts by mass, more preferably 20 to 55 parts by mass, and still more preferably 25 to 45 parts by mass with respect to parts by mass. The reflow heat resistance of the resin composition can be increased and the low anisotropy of the molded product can be improved. In addition, the surface of the molded product can be smoothed and the dustiness can be improved.

1-5. Arbitrary Additives The polyester resin composition for camera modules of the present invention has the following additives, that is, antioxidants (phenols, amines, sulfurs, phosphorus, etc.) depending on the use within a range not impairing the effects of the invention. ), Heat stabilizers (lactone compounds, vitamin Es, hydroquinones, copper halides, iodine compounds, etc.), light stabilizers (benzotriazoles, triazines, benzophenones, benzoates, hindered amines, oxanilides, etc.) ), Other polymers (olefins such as polyolefins, ethylene / propylene copolymers, ethylene / 1-butene copolymers, olefin copolymers such as propylene / 1-butene copolymers, polystyrene, polyamides) , Polycarbonate, polyacetal, polysulfone, polyphenylene oxide, fluorine Base resin, silicone resin, LCP, etc.), flame retardant (bromine, chlorine, phosphorus, antimony, inorganic, etc.), fluorescent brightener, plasticizer, thickener, antistatic agent, release agent, pigment , Crystal nucleating agents and various known compounding agents.

  Although content of an additive changes with kinds of the component, it is preferable that it is 0-10 mass parts with respect to a total of 100 mass parts of a polyester resin (A) and a copolymer (B), and 0-5 masses. % Is more preferable, and 0 to 1% by mass is further preferable.

  When the polyester resin composition for camera modules is used in combination with other components, the selection of the additive may be important. For example, when a catalyst or the like is included in other components used in combination, it is obvious that it is preferable to avoid a component or element that contains a catalyst poison in the additive. Examples of additives that are preferably avoided as described above include components containing phosphorus, sulfur and the like.

  As described above, the molded product of the polyester resin composition for a camera module does not include a polymer including a structural unit having a cyclic oxyhydrocarbon structure. The structural unit having a cyclic oxyhydrocarbon structure is specifically a structural unit derived from an α, β-unsaturated carboxylic acid glycidyl ester, and more specifically a structural unit derived from a (meth) acrylic acid glycidyl ester. . That is, the polymer containing a structural unit having a cyclic oxyhydrocarbon structure is a polymer containing a structural unit derived from (meth) acrylic acid glycidyl ester. Specific examples thereof include ethylene / (meth) acrylic acid alkyl ester. -A (meth) acrylic acid glycidyl ester copolymer is included.

  The molded article of the polyester resin composition for camera modules does not contain a polymer containing a structural unit having a cyclic oxyhydrocarbon structure. Thereby, the fall of the fluidity | liquidity resulting from the reaction of the said polymer and polyester resin (A) at the time of heat-melting and the release property resulting from the fall of crystallinity can be suppressed. Thereby, the fluidity | liquidity and mold release property of a resin composition can be improved further, and a molded article with high dimensional accuracy can be obtained.

  The average light transmittance at 370 to 870 nm of the polyester resin composition for camera modules is preferably 0.5% or less, more preferably 0.1% or less, from the viewpoint of obtaining a sufficient light shielding effect. preferable. The light transmittance of the resin composition can be adjusted by, for example, the content of carbon black (C).

  The average light transmittance of the resin composition can be measured by the following method. Using a SE50 molding machine manufactured by Sumitomo Heavy Industries, a test piece having a width of 30 mm, a length of 30 mm, and a thickness of 0.5 mm is injection-molded at a temperature 10 ° C. higher than the melting point of the resin used. The mold temperature is 150 ° C. The light transmittance at a wavelength of 370 to 870 nm of the obtained flat plate is measured using a Hitachi spectrophotometer “U-4000”, and the average value thereof is defined as “average light transmittance”.

2. Manufacturing method of polyester resin composition for camera module The polyester resin composition for a camera module of the present invention is a method in which the above components are mixed by a known method such as a Henschel mixer, a V blender, a ribbon blender, a tumbler blender, etc. Alternatively, after mixing, it can be produced by a method of granulating or pulverizing after melt-kneading with a single screw extruder, multi-screw extruder, kneader, Banbury mixer or the like.

  The melt kneading is performed at a temperature higher by 5 ° C. to 30 ° C. than the melting point of the polyester resin (A). The preferable lower limit of the melt kneading temperature can be 255 ° C, more preferably 275 ° C, and the preferable upper limit can be 360 ° C, more preferably 340 ° C.

3. Camera Module The camera module of the present invention contains the polyester resin composition for a camera module of the present invention in at least a part of its constituent parts. An example of a camera module is shown in FIG. The camera module shown in FIG. 1 is rotated by a substrate 1, an image sensor 2 mounted on the substrate 1, a holder 5 disposed on the substrate 1 so as to surround the image sensor 2, and a spiral portion at the top of the holder 5. A cylindrical barrel 4 that can be provided, a lens 3 attached to the barrel 4 inside the cylinder, and an IR filter 6 provided between the lens 3 and the imaging device 2 are provided. The image sensor 2 can be a CCD, a CMOS, or the like.

  The light that has passed through the lens 3 enters the image sensor 2 through the IR filter 6. Here, when the barrel 4 rotates, the distance between the lens 3 and the image sensor 2 changes, so that the focus of the camera module can be adjusted.

  The camera module of the present invention preferably includes the polyester resin composition for a camera module of the present invention in at least one of the barrel and the holder. Both the barrel and the holder may contain the polyester resin composition of the present invention, or only one of them may contain the polyester resin composition of the present invention.

  The barrel and the holder may be integrated. You may shape | mold the integrated product of a barrel and a holder with the polyester resin composition for camera modules of this invention.

  The camera module component including the polyester resin composition for a camera module of the present invention can be obtained by, for example, injection molding the polyester resin composition.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the description of the examples.

1. Constituent materials (Manufacture of polyester resin (A))
Add 0.0037 parts of tetrabutyl titanate to 104.6 parts of dimethyl terephthalate and 94.6 parts of 1,4-cyclohexanedimethanol (cis / trans ratio: 30/70), and heat from 150 ° C. to 300 ° C. over 3 hours and 30 minutes. The temperature was raised to cause a transesterification reaction.

  At the end of the transesterification reaction, 0.066 part of magnesium acetate tetrahydrate dissolved in 1,4-cyclohexanedimethanol was added, and then 0.1027 part of tetrabutyl titanate was introduced to carry out a polycondensation reaction. In the polycondensation reaction, the pressure was gradually reduced from normal pressure to 1 Torr over 85 minutes, and at the same time, the temperature was raised to a predetermined polymerization temperature of 300 ° C. to maintain the temperature and pressure. The reaction was terminated when a predetermined stirring torque was reached, and the produced polymer was taken out. Further, the obtained polymer was subjected to solid phase polymerization at 260 ° C. and 1 Torr or less for 3 hours. When the intrinsic viscosity [η] and melting point of the obtained polymer (polyester resin (A)) were measured by the methods described later, the intrinsic viscosity [η] was 0.6 dl / g and the melting point was 290 ° C.

(Manufacture of polyamide resin)
4819.4 g (29.01 mol) of terephthalic acid, a mixture of 1,9-diaminononane and 2-methyl-1,8-diaminooctane [former / latter = 70/30 (molar ratio)] 4772.4 g (30.15) Mol), 241.8 g (1.98 mol) of benzoic acid, 9.8 g of sodium hypophosphite monohydrate and 2.5 liters of distilled water were placed in an autoclave having an internal volume of 20 liters and purged with nitrogen. The mixture was stirred at 100 ° C. for 30 minutes, and the temperature inside the autoclave was increased to 220 ° C. over 2 hours. At this time, the pressure inside the autoclave was increased to 2 MPa. The reaction was continued as it was for 2 hours, then the temperature was raised to 230 ° C., then the temperature was maintained at 230 ° C. for 2 hours, and the reaction was carried out while gradually removing water vapor and keeping the pressure at 2 MPa. Next, the pressure was reduced to 1 MPa over 30 minutes. The reaction was further continued for 1 hour to obtain a prepolymer having an intrinsic viscosity [η] of 0.14 dl / g.

  This was dried at 100 ° C. under reduced pressure for 12 hours and pulverized to a particle size of 2 mm or less. This was subjected to solid phase polymerization at 230 ° C. and 13 Pa (0.1 mmHg) for 10 hours to obtain a white polyamide resin. When the intrinsic viscosity [η] and melting point of the obtained polyamide resin were measured by the methods described later, the intrinsic viscosity [η] was 0.78 dl / g and the melting point was 306 ° C.

(Intrinsic viscosity)
The polyester resin (A) or the polyamide resin was dissolved in a 50/50 mass% mixed solvent of phenol and tetrachloroethane to obtain a sample solution. The flow down time of the obtained sample solution was measured under the condition of 25 ° C. ± 0.05 ° C. using an Ubbelohde viscometer, and the intrinsic viscosity [η] was calculated by applying the following equation.
[Η] = ηSP / [C (1 + kηSP)]
[Η]: Intrinsic viscosity (dl / g)
ηSP: specific viscosity C: sample concentration (g / dl)
t: Number of seconds that the sample solution flows (seconds)
t0: The number of seconds during which the solvent flows (seconds)
k: Constant (slope obtained by measuring the specific viscosity of samples having different solution concentrations (three or more points), plotting the solution concentration on the horizontal axis, and ηsp / C on the vertical axis)
ηSP = (t−t0) / t0

(Melting point)
The measurement of the melting point of the polyester resin (A) or the polyamide resin was performed according to JIS-K7121. Specifically, X-DSC7000 (made by SII) was prepared as a measuring apparatus. A DSC measurement pan in which a sample of polyester resin (A) or polyamide resin is encapsulated is set, and the temperature is increased to 320 ° C. at a temperature increase rate of 10 ° C./min in a nitrogen atmosphere, and the temperature is maintained for 5 minutes. After holding, the temperature was lowered to 30 ° C. by measuring the temperature drop at 10 ° C./min. The temperature at the peak top of the endothermic peak at the time of temperature rise was defined as “melting point”.

(Production of copolymer (B))
A mixture of an ethylene polymer wax obtained with a known solid titanium catalyst component and styrene was reacted in the presence of a known radical generator to obtain the following copolymer (B).
Viscosity measured at 135 ° C. in decalin: 0.11 dl / g
Melt viscosity at 140 ° C: 1,200 mPa · s
Styrene unit content: 20% by mass

  Carbon black (C): Mitsubishi Chemical Corporation “# 980B”

Fibrous reinforcement (D1): wollastonite (NYGLOS 4W, average fiber length: 50 μm, average fiber diameter: 4.5 μm, manufactured by NYCO)
Fibrous reinforcement (D2): Potassium titanate whisker (KUBOTA TXAX-MA, average fiber length: 65 μm, average fiber diameter: 13 μm)
Fibrous reinforcement (D3): Glass fiber (ECS03T-790DE manufactured by Nippon Electric Glass Co., Ltd., average fiber length: 3 mm, average fiber diameter: 6 μm)
Fibrous reinforcement (D4): Milled fiber (EFH-100-31 manufactured by Central Glass Co., Ltd., average fiber length: 100 μm, average fiber diameter: 11 μm)

2. Preparation of polyester resin composition [Example 1]
The polyester resin (A), copolymer (B), carbon black (C), and fibrous reinforcing material (D1) were mixed using a tumbler blender at the ratio shown in Table 1. The mixture was melt kneaded at a cylinder temperature of 15 ° C higher than the melting point of the resin with a TEX30α manufactured by Nippon Steel Works, a twin screw extruder, extruded into a strand, cooled in a water bath, and then the strand was removed with a pelletizer. The pellet-shaped resin composition was obtained by taking up and cutting. The compound property was good.

[Examples 2-9, Comparative Examples 1-2]
A pellet-shaped resin composition was prepared in the same manner as in Example 1 except that the composition shown in Table 1 was used.

  About the obtained polyester resin composition, the following physical properties (thin-wall bending test, reflow heat resistance, fluidity, dimensional stability, surface smoothness, light transmittance, and releasability) were evaluated. These results are shown in Table 1.

(Thin wall bending test)
Using the following injection molding machine, a test piece having a length of 64 mm, a width of 6 mm, and a thickness of 0.8 mm prepared under the following molding conditions was allowed to stand at a temperature of 23 ° C. in a nitrogen atmosphere for 24 hours. Next, a bending test was performed at a span of 26 mm and a bending speed of 5 mm / min with a bending tester (ABSCO manufactured by NTSCO) in an atmosphere of a temperature of 23 ° C. and a relative humidity of 50%. The strength, elastic modulus, and deflection of the test piece were measured. The amount was measured.
Molding machine: Sodick Plustech Co., Ltd. Tupar TR40S3A
Molding machine cylinder temperature: melting point (Tm) + 10 ° C., mold temperature: 150 ° C.

(Reflow heat resistance)
Using the following injection molding machine, a specimen having a length of 64 mm, a width of 6 mm, and a thickness of 0.8 mm prepared under the following molding conditions was conditioned for 96 hours at a temperature of 40 ° C. and a relative humidity of 95%.
Molding machine: Sodick Plustech Co., Ltd. Tupar TR40S3A
Molding machine cylinder temperature: melting point (Tm) + 10 ° C., mold temperature: 150 ° C.
The reflow process of the temperature profile shown in FIG. 2 was performed using an air reflow soldering apparatus (AIS-20-82-C manufactured by Atec Techtron Co., Ltd.).

  The test piece subjected to the humidity conditioning treatment was placed on a glass epoxy substrate having a thickness of 1 mm, and a temperature sensor was placed on the substrate to measure the profile. In FIG. 2, the temperature is increased to 235 ° C. at a predetermined rate. Then, after heating to a predetermined temperature (a is 270 ° C, b is 265 ° C, c is 260 ° C, d is 255 ° C, and e is 250 ° C) for 20 seconds and then cooled to 235 ° C, the test piece melts. The maximum value of the set temperature at which no blisters occur on the surface was determined, and the maximum value of the set temperature was defined as the reflow heat resistance temperature.

(Liquidity)
A bar flow mold having a width of 10 mm and a thickness of 0.5 mm was used for injection under the following conditions, and the flow length (mm) of the resin in the mold was measured.
Injection molding machine: Sodick Plustec, Tupar TR40S3A
Injection set pressure: 2000 kg / cm ² , cylinder set temperature: melting point (Tm) + 10 ° C.
Mold temperature: 150 ° C

(Dimensional stability)
Using the SE50 type molding machine manufactured by Sumitomo Heavy Industries, the obtained resin composition was 50 mm in MD direction length, 30 mm in TD direction, and 0.6 mm in thickness at a temperature 10 ° C. higher than the melting point of the resin used. The test piece was injection molded. The mold temperature was 150 ° C. The mold used is one in which a pair of parallel line-shaped recesses with an interval in the MD direction of 40 mm and a pair of parallel line-shaped recesses with an interval in the TD direction of 20 mm are formed on the bottom surface of the cavity. It was.

  The distance between MD directions and the distance between TD directions of the linear part formed in said test piece were measured, and it was set as the dimension of a molded article. Then, the shrinkage ratio (shrinkage ratio immediately after molding) based on the line spacing (mold dimension) set in the mold is obtained by the formula “(mold dimension−molded product dimension) / mold dimension”. It was.

  Next, the sample was conditioned for 96 hours at a temperature of 40 ° C. and a relative humidity of 95%, and the dimensional change of the obtained sample was measured in the MD direction and the TD direction, respectively. Then, the dimensional change rate (water absorption dimensional change rate) was determined by the formula “(Dimension after water absorption−Dimension before water absorption) / Dimension before water absorption”.

  Further, the anisotropy of the water absorption dimensional change rate was determined by the formula “water absorption dimensional change in MD direction / water absorption dimensional change in TD direction”.

(Surface smoothness)
A test piece having a width of 30 mm, a length of 30 mm, and a thickness of 0.3 mm was obtained using a SE50 type molding machine manufactured by Sumitomo Heavy Industries, Ltd. at a temperature 10 ° C. higher than the melting point of the resin used. Injection molded. The mold temperature was 150 ° C. The surface roughness of the obtained molded product was measured using a surface shape measurement (WYKO) “NT1100” manufactured by Bruker AXS. As measurement conditions, the measurement mode was VSI, the measurement range was 1.2 mm × 0.9 mm, and the correction was Tilt.

(Optical transparency)
A test piece having a width of 30 mm, a length of 30 mm, and a thickness of 0.5 mm was obtained using a SE50 type molding machine manufactured by Sumitomo Heavy Industries, Ltd. at a temperature 10 ° C. higher than the melting point of the resin used. Injection molded. The mold temperature was 150 ° C. The light transmittance at a wavelength of 370 to 870 nm of a flat plate obtained using a Hitachi spectrophotometer “U-4000” was measured, and the average value thereof was defined as “average light transmittance”.

(Releasability)
Injection molding was performed under the following conditions using a bar flow mold having a width of 10 mm and a thickness of 0.5 mm.
Injection molding machine: Sodick Plustec, Tupar TR40S3A
Injection set pressure: 2000 kg / cm ² , cylinder set temperature: melting point (Tm) + 10 ° C.
Mold temperature: 150 ° C
100 shots of injection molding were performed, and the number of shots in which some of the molded product remained on the mold fixing plate was counted, and the result was “number of mold release defects (unit: times / 100 shots)”.

  The resin compositions of Examples 1 to 9 including the polyester resin (A) and the copolymer (B) have good release properties, and the molded product has high dimensional stability (particularly water absorption dimensional stability). ) And good planar smoothness. On the other hand, it can be seen that the resin composition of Comparative Example 1 containing a polyamide resin has low dimensional stability (particularly dimensional stability due to water absorption) and lower surface smoothness than the resin composition of Example 2. It turns out that the resin composition of the comparative example 1 which does not contain a copolymer (B) has low mold release property.

  In particular, it can be seen from the comparison of Examples 1 to 3 and 5 to 6 that the smaller the content ratio of the polyester resin, the better the releasability. From the comparison of Examples 2, 4, 7, and 8, it can be seen that the smaller the average fiber diameter of the fibrous reinforcing material, the smaller the surface roughness of the molded product and the higher the surface smoothness. From the comparison of Examples 2, 4 and 8, it can be seen that the smaller the average fiber length of the fibrous reinforcement, the less the anisotropy of the water absorption dimensional change of the molded product. From the comparison between Examples 2 and 9, it can be seen that when the carbon black content is decreased, the light transmittance is increased (the light shielding rate is decreased).

  The polyester resin composition for camera modules of the present invention is suitable as a molding material for camera module barrels, especially for camera module barrels and holders.

DESCRIPTION OF SYMBOLS 1 Substrate 2 Image sensor 3 Lens 4 Barrel 5 Holder 6 IR filter

Claims (7)

A polyester resin (A) having a melting point or glass transition temperature of 250 ° C. or higher;
A copolymer (B) having a structural unit derived from an olefin and an aromatic hydrocarbon structure, and having an intrinsic viscosity [η] measured in decalin at 135 ° C. of 0.04 to 1.0 dl / g;
Carbon black (C),
A polyester resin composition for a camera module, which does not contain a polymer containing a structural unit having a cyclic oxyhydrocarbon structure.   The polyester resin composition for camera modules according to claim 1, further comprising a fibrous reinforcing material (D). 35 to 78 parts by mass of the polyester resin (A),
0.5-5 parts by mass of the copolymer (B),
0.1 to 5 parts by mass of the carbon black (C),
20 to 55 parts by mass of the fibrous reinforcement (D),
(However, the total of (A), (B), (C) and (D) is 100 parts by mass). The polyester resin composition for a camera module according to claim 2. The polyester resin (A) is
A dicarboxylic acid component unit (a1) comprising 30 to 100 mol% of a dicarboxylic acid component unit derived from terephthalic acid and 0 to 70 mol% of an aromatic dicarboxylic acid component unit other than terephthalic acid;
A dialcohol component unit (a2) containing an alicyclic dialcohol component unit having 4 to 20 carbon atoms;
The polyester resin composition for camera modules as described in any one of Claims 1-3 containing this.   The polyester resin composition for camera modules according to claim 4, wherein the dialcohol component unit (a2) contained in the polyester resin (A) includes a component unit having a cyclohexane skeleton.   The polyester resin composition for camera modules according to claim 2 or 3, wherein the fibrous reinforcing material (D) is at least one selected from wollastonite and potassium titanate. The camera module containing the polyester resin composition as described in any one of Claims 1-6.

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