JP5680788B2 - Liquid crystalline resin composition for camera modules - Google Patents

Description

  The present invention relates to a liquid crystalline resin composition for camera modules.

  Liquid crystalline resins typified by liquid crystalline polyester resins have excellent mechanical strength, heat resistance, chemical resistance, electrical properties, etc. in a well-balanced manner and have excellent dimensional stability. It's being used. Recently, liquid crystal resins have been used for precision equipment parts by taking advantage of these features.

  In the case of precision equipment, particularly optical equipment with a lens, slight dust, dust, etc. affect the performance of the equipment. For example, in a part used in an optical device such as a camera module, if small dust, oil, or dust adheres to the lens, the optical characteristics of the camera module are significantly deteriorated. In order to prevent such deterioration of optical characteristics, the parts that make up the camera module (hereinafter sometimes referred to as “camera module parts”) are ultrasonically cleaned before being assembled and attached to the surface. Small dust, oil, dust, etc. are removed.

  As described above, the molded body formed by molding the liquid crystalline resin composition is easy to peel off because the molecular orientation of the polymer is particularly large in the surface portion. The fluffing phenomenon of peeling and fluffing occurs, and the fluffed raised portion causes small dust.

  Therefore, when the liquid crystalline resin composition is used as a raw material for camera module parts, a special liquid crystalline resin composition is used in which the surface of the molded body is not raised even when the molded body is ultrasonically cleaned. As a special liquid crystalline resin composition, a liquid crystalline resin composition for a camera module containing a liquid crystalline resin, a specific talc, and carbon black is disclosed (see Patent Document 1).

JP 2009-242453 A

  However, according to the study by the present inventors, the liquid crystalline resin composition for a camera module described in Patent Document 1 has insufficient suppression of raising of the surface of the molded article, and the molded article is more difficult to raise the surface of the molded article. A liquid crystalline resin composition for a camera module for manufacturing the above is required.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a liquid crystalline resin composition for a camera module for manufacturing a camera module part whose surface is hardly raised. .

  The inventors of the present invention have made extensive studies to solve the above problems. As a result, the above problem can be solved if a liquid crystalline resin composition for a camera module is prepared by blending a liquid crystalline resin, a specific inorganic filler, and a specific copolymer in a specific ratio. As a result, the present invention has been completed. More specifically, the present invention provides the following.

  (1) At least one (B) inorganic filler selected from (B) a fibrous filler and (B2) a non-fibrous filler in (A) liquid crystalline resin, (C1) an olefin copolymer And (C2) at least one kind of (C) copolymer selected from styrene-based copolymers, (A) component is 65 to 93% by mass, (B) component is 5 to 20% by mass, (C) The component (B1) fibrous filler has an average fiber diameter of 1.0 μm or less, an average fiber length of 5 to 50 μm, and (B2) The non-fibrous filler is at least one selected from a plate-like filler and a granular filler having an average particle diameter of 50 μm or less, and the (C1) olefin copolymer includes α-olefin, α, a glycidyl ester of β-unsaturated acid, System copolymers, styrene and alpha, beta-unsaturated glycidyl liquid resin composition for a camera module consisting of an ester of the acid.

  (2) The liquid crystalline resin composition for a camera module according to (1), wherein the (B2) non-fibrous filler has an average particle size of 10 to 20 μm.

  (3) The liquid crystalline resin composition for a camera module according to (1) or (2), wherein (D) carbon black is further blended so that the content thereof is 1 to 5% by mass.

  When a camera module part is produced using the liquid crystalline resin composition for a camera module of the present invention as a raw material, a camera module part whose surface is hardly raised can be obtained.

It is sectional drawing which shows a common camera module typically.

  Hereinafter, embodiments of the present invention will be described. In addition, this invention is not limited to the following embodiment.

<Liquid crystal resin composition for camera module>
The liquid crystalline resin composition for a camera module of the present invention contains (A) liquid crystalline resin, (B) inorganic filler, and (C) copolymer as essential components.

[(A) Liquid crystalline resin]
The (A) liquid crystalline resin used in the present invention refers to a melt processable polymer having a property capable of forming an optically anisotropic molten phase. The property of the anisotropic molten phase can be confirmed by a conventional polarization inspection method using an orthogonal polarizer. More specifically, the anisotropic molten phase can be confirmed by using a Leitz polarizing microscope and observing a molten sample placed on a Leitz hot stage under a nitrogen atmosphere at a magnification of 40 times. When the liquid crystalline polymer applicable to the present invention is inspected between crossed polarizers, the polarized light is normally transmitted even in the molten stationary state, and optically anisotropic.

  Although it does not specifically limit as said kind of (A) liquid crystalline resin, It is preferable that it is aromatic polyester or aromatic polyester amide. Moreover, the polyester which partially contains aromatic polyester or aromatic polyester amide in the same molecular chain is also in that range. They preferably have a logarithmic viscosity (IV) of at least about 2.0 dl / g, more preferably 2.0-10.0 dl / g when dissolved in pentafluorophenol at 60 ° C. at a concentration of 0.1% by weight. .) Are preferably used.

  The aromatic polyester or aromatic polyester amide as the liquid crystalline resin (A) applicable to the present invention is particularly preferably at least one selected from the group of aromatic hydroxycarboxylic acids, aromatic hydroxyamines, and aromatic diamines. An aromatic polyester or aromatic polyester amide having the above compound as a constituent component.

More specifically,
(1) A polyester mainly composed of one or more aromatic hydroxycarboxylic acids and derivatives thereof;
(2) mainly (a) one or more of aromatic hydroxycarboxylic acids and derivatives thereof; and (b) one or more of aromatic dicarboxylic acids, alicyclic dicarboxylic acids and derivatives thereof; c) Polyester comprising at least one or more of aromatic diol, alicyclic diol, aliphatic diol and derivatives thereof;
(3) mainly (a) one or more of aromatic hydroxycarboxylic acids and derivatives thereof; (b) one or more of aromatic hydroxyamines, aromatic diamines and derivatives thereof; and (c). A polyester amide comprising one or more of aromatic dicarboxylic acid, alicyclic dicarboxylic acid and derivatives thereof;
(4) mainly (a) one or more of aromatic hydroxycarboxylic acids and derivatives thereof; (b) one or more of aromatic hydroxyamines, aromatic diamines and derivatives thereof; and (c). One or more of aromatic dicarboxylic acid, alicyclic dicarboxylic acid and derivatives thereof, and (d) at least one or more of aromatic diol, alicyclic diol, aliphatic diol and derivatives thereof, and And polyester amides composed of Furthermore, you may use a molecular weight modifier together with said structural component as needed.

（Ｘ：アルキレン（Ｃ１〜Ｃ４）、アルキリデン、−Ｏ−、−ＳＯ−、−ＳＯ２−、−Ｓ−、−ＣＯ−より選ばれる基である）

（Ｙ：−（ＣＨ２）ｎ−（ｎ＝１〜４）、−Ｏ（ＣＨ２）ｎＯ−（ｎ＝１〜４）より選ばれる基である。）Preferable examples of the specific compound constituting the liquid crystalline resin (A) applicable to the present invention include aromatic hydroxycarboxylic acids such as p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid, and 2,6-dihydroxy. Aromatic diols such as naphthalene, 1,4-dihydroxynaphthalene, 4,4′-dihydroxybiphenyl, hydroquinone, resorcinol, compounds represented by the following general formula (I) and the following general formula (II); terephthalic acid, isophthalic acid , 4,4′-diphenyldicarboxylic acid, 2,6-naphthalenedicarboxylic acid and aromatic dicarboxylic acids such as compounds represented by the following general formula (III); aromatic amines such as p-aminophenol and p-phenylenediamine Kind.

(X is a group selected from alkylene (C1 to C4), alkylidene, -O-, -SO-, -SO2-, -S-, -CO-)

(Y is a group selected from — (CH 2) n — (n = 1 to 4) and —O (CH 2) n O— (n = 1 to 4).

The (A) liquid crystalline resin used in the present invention can be prepared by a known method using a direct polymerization method or a transesterification method from the above monomer compound (or a mixture of monomers). A combination method or a slurry polymerization method is used. The above compounds having ester-forming ability may be used for polymerization as they are, or may be modified from a precursor to a derivative having ester-forming ability in the previous stage of polymerization. In the polymerization, various catalysts can be used. Typical examples include dialkyl tin oxide, diaryl tin oxide, titanium dioxide, alkoxy titanium silicates, titanium alcoholates, and alkali of carboxylic acid. And alkaline earth metal salts, Lewis acid salts such as BF _{3 and} the like. The amount of the catalyst used is generally about 0.001 to 1% by weight, particularly about 0.01 to 0.2% by weight, based on the total weight of the monomers. If the polymers produced by these polymerization methods are further necessary, the molecular weight can be increased by solid-phase polymerization by heating in a reduced pressure or an inert gas.

The melt viscosity of the (A) liquid crystalline resin obtained by the above method is not particularly limited. Generally, those having a melt viscosity at a molding temperature of 10 MPa or more and 600 MPa or less at a shear rate of 1000 sec ⁻¹ can be used. However, those having a very high viscosity are not preferable because the fluidity is extremely deteriorated. The (A) liquid crystalline resin may be a mixture of two or more liquid crystalline resins.

  Content of (A) liquid crystalline resin in the liquid crystalline resin composition for camera modules of this invention is 65-93 mass%. If the content of the component (A) is 65% by mass or more, it is preferable for fluidity and suppression of raising of the surface of the molded body, and if the content of the component (A) is 93% by mass or less, preferable for the reason of heat resistance. . Moreover, preferable content of (A) component is 80-93 mass%.

[(B) Inorganic filler]
(B) The inorganic filler is selected from (B1) a fibrous filler having an average fiber diameter of 1.0 μm or less and an average fiber length of 5 to 50 μm, and (B2) a non-fibrous filler having an average particle diameter of 50 μm or less. At least one kind.

  (B1) The average fiber diameter of the fibrous filler is 1.0 μm or less, and the preferable average fiber diameter is 0.3 to 0.6 μm. The average fiber diameter is 1.0 μm or less from the viewpoint of suppressing raising of the surface of the molded body. The average fiber diameter is a value obtained by taking a stereomicroscope image from a CCD camera into a PC and measuring by an image processing method using an image measuring machine.

  Moreover, the average fiber length of (B1) fibrous filler is 5-50 micrometers, a preferable average fiber length is 5-30 micrometers, and a more preferable average fiber length is 7-30 micrometers. The average fiber length of 5 μm or more is necessary for maintaining the mechanical strength and the deflection temperature under load necessary for the camera module, and it is necessary for suppressing the raising of the surface of the molded body to be 50 μm or less. The average fiber diameter is a value obtained by taking a stereomicroscope image from a CCD camera into a PC and measuring by an image processing method using an image measuring machine.

  Any fiber can be used as long as it is a fibrous filler satisfying the above shape. Examples of (B1) fibrous filler include glass fiber, carbon fiber, asbestos fiber, silica fiber, silica Examples thereof include inorganic fibrous materials such as alumina fibers, zirconia fibers, boron nitride fibers, silicon nitride fibers, boron fibers, potassium titanate fibers, and metal fibrous materials such as stainless steel, aluminum, titanium, copper, and brass. As the component (B1), two or more kinds of fibrous fillers may be used. In the present invention, potassium titanate fibers are preferably used as the component (B1).

  (B2) The non-fibrous filler is at least one selected from a plate-like filler and a granular filler having an average particle diameter of 50 μm or less. The average particle size of 50 μm or less is necessary from the viewpoint of suppressing raising of the surface of the molded body. The average particle size is preferably 10 to 20 μm. The average particle diameter is a value measured by a method called laser diffraction / scattering particle size distribution measurement.

  Any filler can be used as long as it is a non-fibrous filler satisfying the above shape, and examples of the plate filler include talc, mica, glass flakes, various metal foils, and the like. In addition, particulate fillers include silica, quartz powder, glass beads, glass powder, calcium oxalate, aluminum oxalate, kaolin, clay, diatomaceous earth, wollastonite, iron oxide, titanium oxide, zinc oxide. Metal oxides such as alumina, carbonates of metals such as calcium carbonate and magnesium carbonate, sulfates of metals such as calcium sulfate and barium sulfate, other silicon carbide, silicon nitride, boron nitride, various metal powders, etc. . As the component (B2), two or more kinds may be used. In the present invention, as the component (B2), it is preferable to use talc and mica of plate-like filler and silica of granular filler, and it is more preferable to use talc and mica of plate-like filler.

  The content of the component (B) (the sum of the content of the component (B1) and the content of the component (B2)) is 5 to 20% by mass in the liquid crystal composition for camera modules of the present invention. is there. The component (B) content of 5% by mass or more is necessary from the viewpoint of securing the mechanical strength and the deflection temperature under load necessary for the camera module. It is necessary in terms of raising the hair. More preferably, the content is 5 to 15% by mass.

[(C) Copolymer]
The (C) copolymer is at least one selected from (C1) an olefin copolymer and (C2) a styrene copolymer. Mixing the component (C) with the liquid crystalline resin composition for a camera module contributes to suppressing raising of the surface of the molded product when the molded product obtained by molding the composition is subjected to ultrasonic cleaning.
The reason for suppressing the raising is not clarified, but it is considered that by adding a certain amount, the surface state of the molded body is changed, and the change contributes to suppressing the raising.

  (C1) The olefin copolymer is composed of an α-olefin and a glycidyl ester of an α, β-unsaturated acid.

The α-olefin is not particularly limited, and examples thereof include ethylene, propylene, and butene. Among them, ethylene is preferably used. The glycidyl ester of α, β-unsaturated acid is represented by the following general formula (IV). Examples of the glycidyl ester unit of α, β-unsaturated acid include glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylate, glycidyl itaconate and the like, and glycidyl methacrylate is particularly preferable.

  (C1) The content of α-olefin in the olefin copolymer is preferably 87 to 98% by mass, and the content of glycidyl ester of α, β-unsaturated acid is preferably 13 to 2% by mass.

  The (C1) olefin copolymer used in the present invention is a third component other than the above two components within the scope of the present invention, such as acrylonitrile, acrylate ester, methacrylate ester, α-methylstyrene, maleic anhydride, etc. You may contain 0-48 mass parts of 1 type, or 2 or more types of an olefin type unsaturated ester with respect to 100 mass parts of said 2 components.

  The olefin copolymer which is the component (C1) of the present invention can be easily prepared by a normal radical polymerization method using the monomers and radical polymerization catalysts of the respective components. More specifically, usually an α-olefin and an α, β-unsaturated glycidyl ester in the presence of a radical generator at 500 to 4000 atm and 100 to 300 ° C. in the presence of a suitable solvent or chain transfer agent. Or it can manufacture by the method of copolymerizing in absence. It can also be produced by a method in which an α-olefin, an α, β-unsaturated glycidyl ester and a radical generator are mixed and melt graft copolymerized in an extruder.

  The (C2) styrene copolymer is composed of styrenes and a glycidyl ester of an α, β-unsaturated acid. Since the glycidyl ester of α, β-unsaturated acid is the same as that described in the component (C1), the description thereof is omitted.

  Examples of styrenes include styrene, α-methylstyrene, brominated styrene, divinylbenzene and the like, and styrene is preferably used.

  The (C2) styrene-based copolymer used in the present invention may be a multi-component copolymer obtained by copolymerization using one or more other vinyl monomers as the third component in addition to the above two components. A suitable third component is one or more olefinic unsaturated esters such as acrylonitrile, acrylic acid ester, methacrylic acid ester, and maleic anhydride. A copolymer in which 40% by mass or less of a repeating unit derived from these is introduced into the (C2) styrene copolymer is preferred as the component (C2).

  (C2) The glycidyl ester content of α, β-unsaturated acid in the styrene-based copolymer is 2 to 20% by mass, and styrenes are preferably 80 to 98% by weight.

  (C2) The styrene copolymer can be prepared by a normal radical polymerization method using monomers and radical polymerization catalysts of each component. More specifically, styrenes and glycidyl esters of α, β-unsaturated acids are usually present in the presence of a radical generator at 500 to 4000 atmospheres at 100 to 300 ° C. in the presence of a suitable solvent or chain transfer agent or It can be produced by a method of copolymerization in the absence. It can also be produced by a method in which styrenes, a glycidyl ester of an α, β-unsaturated acid and a radical generator are mixed and melt graft copolymerized in an extruder.

  The (C) copolymer is preferably an (C1) olefin copolymer in terms of heat resistance, but the ratio of the (C1) component to the (C2) component is in accordance with the required characteristics as appropriate. Can be selected.

  The content of the (C) copolymer (the total amount of the (C1) component and the (C2) component) is 2 to 10% by mass in the camera module resin composition of the present invention. The content of the component (C) is 2% by mass or more from the viewpoint of suppressing raising of the surface of the molded body, and being 10% by mass or less obtains a good molded body without impairing fluidity. It is necessary for the reason. More preferably, the content is 2 to 7% by mass.

[(D) Carbon black]
The carbon black (D) used in the present invention is not particularly limited and is generally available for use in resin coloring, but usually contains a lump formed by agglomeration of primary particles, and is not less than 50 μm. When a large amount of lumps of a size is contained, a lot of bumps (fine bumpy projections (fine irregularities) in which carbon black is agglomerated) may occur on the surface of the molded article formed by molding the resin composition of the present invention. There is not preferable. It is necessary from the point of suppression of raising on the surface of the molded body that the particle size of the above-mentioned massive particles is 20 ppm or less with particles of 50 μm or more. A preferable content rate is 5 ppm or less.

  (D) As a compounding quantity of carbon black, the range of 1-5 mass% is preferable in the liquid crystalline resin composition for camera modules. If the blending amount of the carbon black is less than 1 part by mass, the jetness of the resulting resin composition will be lowered, and the light-shielding property will be uneasy, and if it exceeds 5 parts by mass, it will be uneconomical. The possibility of occurrence of irregularities increases.

[Other ingredients]
The liquid crystalline resin composition for a camera module of the present invention includes other polymers, known substances generally added to synthetic resins, that is, antioxidants, ultraviolet absorbers, etc., as long as the effects of the present invention are not impaired. Stabilizers, antistatic agents, flame retardants, colorants such as dyes and pigments, lubricants, mold release agents, crystallization accelerators, crystal nucleating agents, and the like can be appropriately added according to the required performance.

[Preparation of liquid crystalline resin composition for camera module]
The preparation of the resin composition for a camera module of the present invention is not particularly limited. For example, the above components (A), (B), and (C) are added and blended, and these are melt kneaded using a single screw or twin screw extruder to prepare a liquid crystalline resin composition for a camera module. Is done.

[Liquid crystalline resin composition for camera modules]
The shape of the component (B) in the liquid crystalline resin composition for a camera module of the present invention is different from the shape of the component (B) before blending. The shape of the above component (B) is the shape before blending. If the shape before blending is as described above, a camera module component whose surface is difficult to be raised can be obtained.

The liquid crystalline resin composition for a camera module of the present invention obtained as described above preferably has a melt viscosity of 50 Pa · sec or less. One of the characteristics of the liquid crystalline resin composition for camera modules of the present invention is that it has high fluidity and excellent moldability. Here, the melt viscosity is a value obtained by a measurement method based on ISO 11443 under conditions of a cylinder temperature of 350 ° C. and a shear rate of 1000 sec ⁻¹ .

  The liquid crystalline resin composition for a camera module of the present invention preferably has a deflection temperature under load of 200 ° C. or higher. The point which is excellent in heat resistance is also one of the characteristics of the liquid crystalline resin composition for camera modules of this invention. In addition, the value measured by the method based on ISO75-1 and 2 is employ | adopted for deflection temperature under load.

<Camera module parts>
A camera module component is manufactured using the liquid crystalline resin composition for a camera module. If the resin composition of this invention is used as a raw material, it will become difficult to raise the surface of the components for camera modules. Since the camera module component is ultrasonically cleaned, it is required that the surface is not easily raised even if the ultrasonic cleaning is performed. If the resin composition of the present invention is used, even if the ultrasonic cleaning of camera module parts is performed under stronger conditions, there will be no or almost no dropouts causing dust and the like. Accordingly, after the camera module parts are incorporated into the finished product, the dust generated by raising the surface of the camera module parts hardly affects the quality of the finished product.

  A camera module component formed by molding the liquid crystalline resin composition for a camera module of the present invention will be described. A cross section of a general camera module is schematically shown in FIG. As shown in FIG. 1, the camera module 1 includes a substrate 10, an optical element 11, a lead wiring 12, a holder 13, a barrel 14, a lens 15, and an IR filter 16.

  The optical element 11 is disposed on the substrate 10, and the optical element 11 and the substrate 10 are electrically connected by a lead wiring 12.

  The holder 13 is disposed on the substrate 10 and covers the optical element 11. The holder 13 has an opening at the top, and a spiral groove is formed on the wall of the opening.

  The barrel 14 has a cylindrical shape, and the lens 15 is held inside the cylindrical shape so as to be substantially horizontal. In addition, a spiral convex portion is formed on the side wall of one end of the cylinder, and the spiral convex portion and the spiral groove portion formed on the opening wall surface of the holder 13 are screwed together to form a barrel. 14 is connected to the holder 13. An IR filter 16 is disposed at one end of the barrel 14 so as to close one end of the cylindrical barrel 14. As shown in FIG. 1, the IR filter 16 and the lens 15 are arranged substantially in parallel.

  In the camera module 1 as shown in FIG. 1, the distance between the lens 15 and the optical element 11 changes as the barrel 14 rotates. The focus of the camera can be adjusted by adjusting this distance.

  In the camera module 1 as described above, the holder 13 and the barrel 14 which are parts for the camera module can be manufactured using the liquid crystalline resin composition for the camera module of the present invention as a raw material. A general liquid crystalline resin composition is not suitable as a raw material for producing these parts. When the holder 13 and the barrel 14 are manufactured using a general liquid crystalline resin composition as a raw material, the following problems occur.

  A molded body formed by molding a general liquid crystalline resin composition has a particularly high molecular orientation of the polymer at the surface portion, so that the surface of the molded body is easily raised, and this raising causes generation of small dust. If this small dust adheres to the lens 15 or the like, the performance of the camera module is degraded.

  Camera module parts such as the holder 13 and the barrel 14 are ultrasonically cleaned before being assembled into the camera module 1 for the purpose of removing dust and small dust on the surface. However, since the surface of a molded product formed by molding a general liquid crystalline resin composition is easily raised, the surface becomes fluffy when ultrasonically cleaned. Since such a problem arises, the molded object formed by shape | molding a liquid crystalline resin composition cannot usually be ultrasonically cleaned.

  The focus adjustment described above is performed by moving the spiral convex portion formed on the side wall of the end portion of the barrel 14 through the spiral groove portion formed on the opening wall surface of the holder 13. At this time, the spiral groove and the spiral protrusion rub against each other on the contact surface. As described above, the molded body formed by molding a general liquid crystalline resin composition has a possibility of raising the surface, and thus the surface may be peeled off to produce a peeled product. There is a high possibility that the peeled material becomes small dust and adheres to the lens 15 or the like, thereby reducing the performance of the camera module.

  As described above, normally, the liquid crystalline resin composition cannot be used as a raw material for the holder 13 or the barrel 14, but when the liquid crystalline resin composition for a camera module of the present invention is formed into a molded body, Since the surface state of the molded body is improved so that the problem of raising is hardly caused even by ultrasonic cleaning, it can be preferably used as a raw material for the holder 13 and the barrel 14.

  EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited only to these examples.

<Material>
Liquid crystalline resin (liquid crystalline polyester amide resin): Vectra (registered trademark) E950i (manufactured by Polyplastics Co., Ltd.)
Fibrous filler 1: Tismo N-102 manufactured by Otsuka Chemical Co., Ltd. (potassium titanate fiber, average fiber diameter 0.3 to 0.6 μm, average fiber length 10 to 20 μm)
Fibrous filler 2: PF70E-001 (milled glass fiber, fiber diameter 10 μm, weight average length 70 μm) manufactured by Nitto Boseki Co., Ltd.
Non-fibrous filler 1: Crown Talc PP (Talc, average particle diameter 12.8 μm, average aspect ratio 6) manufactured by Matsumura Sangyo Co., Ltd.
Non-fibrous filler 2: AB-25S manufactured by Yamaguchi Mica Industry Co., Ltd. (mica, average particle size 24 μm)
Non-fibrous filler 3: A-41S manufactured by Yamaguchi Mica Kogyo Co., Ltd. (Mica, average particle size 47 μm)
Olefin copolymer: Bond First 2C (ethylene-glycidyl methacrylate copolymer (containing 6% by weight of glycidyl methacrylate)) manufactured by Sumitomo Chemical Co., Ltd.
Carbon black: VULCAN XC305 manufactured by Cabot Japan Co., Ltd. (carbon black, average particle diameter of 20 nm, ratio of particle diameter of 50 μm or more is 20 ppm or less, granular)

<Manufacture of liquid crystalline resin composition for camera module>
The above components were melt-kneaded at a cylinder temperature of 350 ° C. using a twin screw extruder (TEX30α type manufactured by Nippon Steel Works) at the ratio shown in Table 1 to obtain a liquid crystalline resin composition pellet for a camera module. It was.

<Melt viscosity>
The melt viscosity of the liquid crystalline resin compositions for camera modules of Examples and Comparative Examples was measured using the pellets. Specifically, the apparent melt viscosity under conditions of a cylinder temperature of 350 ° C. and a shear rate of 1000 sec ⁻¹ was measured based on ISO 11443 using a capillary rheometer (Capillograph 1D manufactured by Toyo Seiki: piston diameter 10 mm). For the measurement, an orifice having an inner diameter of 1 mm and a length of 20 mm was used. The measurement results are shown in Table 1.

<Bar fluidity test>
The fluidity of the liquid crystalline resin compositions for camera modules of Examples and Comparative Examples was evaluated using the pellets. Specifically, the pellet was molded into a 0.3 mm-thick test piece under the following molding conditions using a molding machine (“SE30DUZ” manufactured by Sumitomo Heavy Industries, Ltd.). The fluidity was evaluated by measuring the length of the resulting molded body. The evaluation results are shown in Table 1.
〔Molding condition〕
Cylinder temperature: 350 ° C
Mold temperature: 80 ℃
Injection pressure: 100 MPa
Injection speed: 200mm / sec

<Evaluation of napping state (surface napping suppression effect) on the surface of the molded body>
The pellets of Examples and Comparative Examples were molded under the following molding conditions using a molding machine (“SE30DUZ” manufactured by Sumitomo Heavy Industries, Ltd.) to obtain a molded body of 12.5 mm × 120 mm × 0.8 mm. What cut | disconnected this molded object in half was used as a test piece.
〔Molding condition〕
Cylinder temperature: 350 ° C
Mold temperature: 90 ℃
Injection speed: 80mm / sec
[Evaluation]
The molded body cut in half was subjected to an ultrasonic cleaner (output 300 W, frequency 45 kHz) in water at room temperature for 3 minutes. Thereafter, the molded bodies before and after being subjected to an ultrasonic cleaning machine were compared, and the area (raised area) of the fluffed portion on the surface of the molded body was evaluated with an image measuring instrument (LUZEXFS manufactured by Nireco Corporation). The evaluation area is 750 mm ² (12.5 mm × 60 mm). The evaluation results are shown in Table 1.
The smaller the raising area, the higher the raising suppression effect.

<Load deflection temperature>
The pellets of Examples and Comparative Examples were molded into measurement test pieces (4 mm × 10 mm × 80 mm) under the following molding conditions using a molding machine (“SE100DU” manufactured by Sumitomo Heavy Industries, Ltd.). Thereafter, the deflection temperature under load was measured by a method based on ISO 75-1,2. The measurement results are shown in Table 1.
〔Molding condition〕
Cylinder temperature: 350 ° C
Mold temperature: 80 ℃
Back pressure: 2.0MPa
Injection speed: 33mm / sec

<Charpy impact test>
The pellets of Examples and Comparative Examples were molded into measurement test pieces (4 mm × 10 mm × 80 mm) under the following molding conditions using a molding machine (“SE100DU” manufactured by Sumitomo Heavy Industries, Ltd.). Then, the Charpy impact value was measured by the method based on ISO 179-1. The results are shown in Table 1.
〔Molding condition〕
Cylinder temperature: 350 ° C
Mold temperature: 80 ℃
Back pressure: 2.0MPa
Injection speed: 33mm / sec

  As is clear from the results shown in Table 1, it was confirmed that the molded body produced using the pellets of the example did not fluff even when ultrasonically cleaned. From this result, it can be said that the molded body formed by molding the pellets of the examples has a surface state greatly different from the molded body formed by molding normal liquid crystalline resin composition pellets such as comparative examples.

  Moreover, it was confirmed that the molded object manufactured using the pellet of an Example is excellent in heat resistance, excellent in fluidity | liquidity, and excellent in impact resistance.

DESCRIPTION OF SYMBOLS 1 Camera module 10 Board | substrate 11 Optical element 12 Lead wiring 13 Holder 14 Barrel 15 Lens 16 IR filter

Claims (3)

(A) In liquid crystalline resin,
At least one (B) inorganic filler selected from (B1) fibrous filler and (B2) non-fibrous filler,
At least one (C) copolymer selected from (C1) an olefin copolymer and (C2) a styrene copolymer;
(A) It mix | blends so that a component may be 65-93 mass%, (B) component 5-20 mass%, (C) component may be 2-10 mass%,
The (B1) fibrous filler has an average fiber diameter of 1.0 μm or less and an average fiber length of 5 to 50 μm.
The (B2) non-fibrous filler is at least one selected from a plate-like filler and a granular filler having an average particle diameter of 50 μm or less,
The (C1) olefin copolymer is composed of an α-olefin and an α, β-unsaturated glycidyl ester,
The (C2) styrene copolymer is composed of styrene selected from the group consisting of styrene, α-methylstyrene, brominated styrene, and divinylbenzene, and a glycidyl ester of α, β-unsaturated acid. Liquid crystalline resin composition for camera modules.   The liquid crystalline resin composition for a camera module according to claim 1, wherein the (B2) non-fibrous filler has an average particle size of 10 to 20 μm.   The liquid crystalline resin composition for a camera module according to claim 1 or 2, wherein (D) carbon black is further blended so that the content thereof is 1 to 5% by mass.

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