KR101537109B1 - Liquid crystal resin composition for camera modules - Google Patents

Abstract

Provided is a liquid crystalline resin composition for a camera module for producing a component for a camera module in which the surface of a molded body does not easily wrinkle.
(B) an inorganic filler selected from (B1) a fibrous filler and (B2) a non-fibrous filler, (C1) an olefin-based copolymer and (C2) a styrene-based copolymer to the liquid crystalline resin (A) (A) is contained in an amount of 65 to 93 mass%, (B) is contained in an amount of 5 to 20 mass%, and (C) is contained in an amount of 2 to 10 mass% , The component (B1) has an average fiber diameter of 1.0 μm or less and an average fiber length of 5 to 50 μm, and the component (B2) has a mean particle size of 50 μm or less, , And the component (C1) and the component (C2) are resin compositions composed of specific components.

Description

TECHNICAL FIELD [0001] The present invention relates to a liquid crystal resin composition for a camera module,

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

Liquid crystalline resins typified by liquid crystalline polyester resins have been widely used as high-performance engineering plastics because they have excellent mechanical strength, heat resistance, chemical resistance, electrical properties and balance of dimensional stability. In recent years, liquid crystalline resins have been used in precision instrument parts by taking advantage of these characteristics.

In the case of precision instruments, especially optical instruments with lenses, fine dust, dust, etc. can affect the performance of the machine. For example, in a component used in an optical apparatus such as a camera module, optical characteristics of the camera module remarkably deteriorate when small particles, oil, and dust adhere to the lens. For the purpose of preventing such deterioration of the optical characteristics, components (hereinafter, referred to as " components for a camera module ") constituting a camera module are usually ultrasonically cleaned before assembling, and small dust, oil, dust Is removed.

As described above, in the molded article formed by molding the liquid crystalline resin composition, since the molecular orientation of the polymer is particularly large at the surface portion and the surface of the molded article is easily peeled off, ultrasonic cleaning of the molded article causes bristling phenomenon And the brushed portion where fluff is formed as such causes small dust to be generated.

Therefore, when a liquid crystal resin composition is used as a raw material for a component for a camera module, a special liquid crystal resin composition which does not wrinkle the surface of the molded article even when the molded article is ultrasonically cleaned is used. As a specific liquid crystalline resin composition, there is disclosed a liquid crystalline resin composition for a camera module comprising a liquid crystalline resin and specific talc and carbon black (see Patent Document 1).

Japanese Patent Application Laid-Open No. 2009-242453

However, in the studies of the present inventors, it has been found that the liquid crystal resin composition for a camera module described in Patent Document 1 has insufficient bristle suppression on the surface of the molded article, and furthermore, A resin composition is required.

An object of the present invention is to provide a liquid crystalline resin composition for a camera module for producing a component for a camera module whose surface is not easily worn.

DISCLOSURE OF THE INVENTION The present inventors have conducted intensive studies in order to solve the above problems. As a result, it has been found out that the above problems can be solved by making a liquid crystalline resin composition for a camera module comprising a liquid crystalline resin, a specific inorganic filler and a specific copolymer in a specified ratio, It came to the following. More specifically, the present invention provides the following.

(1) A composition comprising (A) at least one inorganic filler selected from (B1) a fibrous filler and (B2) a non-fibrous filler, (C1) an olefin- (C) is selected so that the content of the component (A) is from 65 to 93 mass%, the content of the component (B) is from 5 to 20 mass%, and the content of the component (C) is from 2 to 10 mass% And the fibrous filler (B1) has an average fiber diameter of 1.0 탆 or less and an average fiber length of 5 to 50 탆, and the (B2) fibrous filler has an average particle diameter of 50 탆 or less, (C1) olefin-based copolymer is composed of an? -Olefin and a glycidyl ester of?,? - unsaturated acid, and the (C2) olefin- The styrenic copolymer is composed of styrenes and glycidyl esters of?,? - unsaturated acids.

(2) The liquid crystalline resin composition for a camera module according to (1), wherein the average particle diameter of the non-fibrous filler (B2) is 10 to 20 占 퐉.

(3) A liquid crystalline resin composition for a camera module according to (1) or (2), further comprising (D) carbon black so as to have a content of 1 to 5 mass%.

When a component for a camera module is manufactured using the liquid crystalline resin composition for a camera module of the present invention as a raw material, a component for a camera module whose surface is not easily brushed can be obtained.

1 is a cross-sectional view schematically showing a general camera module.

Hereinafter, an embodiment of the present invention will be described. However, the present invention is not limited to the following embodiments.

<Liquid crystalline resin composition for camera module>

 The liquid crystalline resin composition for a camera module of the present invention comprises (A) a liquid crystalline resin, (B) an inorganic filler, and (C) a copolymer as essential components.

[(A) Liquid crystalline resin]

The liquid crystalline resin (A) used in the present invention refers to a melt-processible polymer having properties capable of forming an optically anisotropic melt phase. The properties of the anisotropic molten phase can be confirmed by an ordinary polarization test using an orthogonal polarizer. More specifically, confirmation of the anisotropic molten phase can be carried out by observing a molten sample put on a Leitz hot stage at a magnification of 40 times under a nitrogen atmosphere using a Leitz polarization microscope. The liquid crystalline polymer which can be applied to the present invention is optically anisotropic when it is examined between orthogonal polarizers, for example, in the case of the molten stop state, and usually the polarized light is transmitted.

The kind of the liquid crystalline resin (A) is not particularly limited, but an aromatic polyester or an aromatic polyester amide is preferable. Polyesters partially containing an aromatic polyester or an aromatic polyester amide in the same molecular chain are also in the range. They preferably have an logarithmic viscosity (IV) of at least about 2.0 dl / g, more preferably 2.0 to 10.0 dl / g when dissolved at a concentration of 0.1 wt% in pentafluorophenol at 60 ° C do.

As the aromatic polyester or aromatic polyester amide (A) applicable as the liquid crystalline resin applicable to the present invention, it is particularly preferable to use at least one compound or compounds selected from the group of aromatic hydroxycarboxylic acids, aromatic hydroxyamines and aromatic diamines And aromatic polyester amides having, as constituent components, an aromatic polyester and an aromatic polyester amide.

More specifically,

(1) a polyester mainly composed of one or more kinds of aromatic hydroxycarboxylic acids and derivatives thereof;

(2) at least one of (a) an aromatic hydroxycarboxylic acid and a derivative thereof, (b) one or more of aromatic dicarboxylic acids, alicyclic dicarboxylic acids and derivatives thereof, and c) a polyester comprising at least one or more of an aromatic diol, an alicyclic diol, an aliphatic diol and a derivative thereof;

(3) at least one of (a) one or more aromatic hydroxycarboxylic acids and derivatives thereof, (b) one or more of aromatic hydroxamines, aromatic diamines and derivatives thereof, (c) aromatic Polyester amides comprising one or more of dicarboxylic acid, alicyclic dicarboxylic acid and derivatives thereof;

(B) at least one kind of an aromatic hydroxyamine, an aromatic diamine or a derivative thereof, (c) at least one kind of an aromatic hydroxycarboxylic acid, Dicarboxylic acid, alicyclic dicarboxylic acid and derivatives thereof, (d) polyester amide comprising at least one or more kinds of aromatic diols, alicyclic diols, aliphatic diols and derivatives thereof, etc. . A molecular weight regulator may be used in combination with the above-mentioned components, if necessary.

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, Aromatic hydrocarbons such as hydroxynaphthalene, 1,4-dihydroxynaphthalene, 4,4'-dihydroxybiphenyl, hydroquinone, resorcin, compounds represented by the following general formula (I) Diol; Aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, 4,4'-diphenyldicarboxylic acid, 2,6-naphthalenedicarboxylic acid and compounds represented by the following general formula (III); p-aminophenol, p-phenylenediamine, and other aromatic amines.

(X is a group selected from the group consisting of alkylene (C1-C4), alkylidene, -O-, -SO-, -SO2-, -S-,

(Y is - (CH2) n- (n = 1-4), -O (CH2) nO- (n = 1-4)

The liquid crystalline resin (A) used in the present invention can be prepared by a known method from the above-mentioned monomer compound (or a mixture of monomers) directly using a polymerization method or an ester exchange method, A slurry polymerization method or the like is used. The above-mentioned compounds having an ester forming ability (forming ability) may be used for polymerization in the form as it is, or may be modified from a precursor to a derivative having the ability to form an ester in the pre-polymerization stage. In the polymerization of these, various catalysts can be used. Typical examples thereof include dialkyltin oxides, diaryltin oxides, titanium dioxide, alkoxytitanium silicates, titanium alcoholates, alkali and alkaline earth metal salts of carboxylic acids, BF _3, and the like. The amount of the catalyst to be used is generally about 0.001 to 1% by mass, particularly about 0.01 to 0.2% by mass, based on the total weight of the monomer. If necessary, the polymer produced by these polymerization methods can be increased in molecular weight by solid state polymerization which is carried out under reduced pressure or in an inert gas.

The melt viscosity of the liquid crystalline resin (A) obtained by the above-mentioned 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, a very high viscosity per se is not preferable because the fluidity is extremely deteriorated. The liquid crystalline resin (A) may be a mixture of two or more liquid crystalline resins.

The content of the liquid crystalline resin (A) in the liquid crystalline resin composition for a camera module of the present invention is 65 to 93 mass%. When the content of the component (A) is 65% by mass or more, it is preferable for reasons of fluidity and suppression of surface bristles on the surface of the molded article, and the content of the component (A) is preferably 93% by mass or less. The preferable content of the component (A) is 80 to 93 mass%.

[(B) Inorganic filler]

(B1) an inorganic filler having an average fiber diameter of 1.0 mu m or less and an average fiber length of 5 to 50 mu m, and (B2) at least one filler selected from a non-fibrous filler having an average particle diameter of 50 mu m or less to be.

(B1) The fibrous filler has an average fiber diameter of 1.0 占 퐉 or less and a preferable average fiber diameter of 0.3 to 0.6 占 퐉. The above-mentioned average fiber diameter of 1.0 탆 or less is necessary from the viewpoint of suppressing brushed surface of the molded article. The average fiber diameter is obtained by taking a stereoscopic microscope image from a CCD camera into a PC and employing a value measured by an image measuring instrument using an image processing technique.

The average fiber length of the (B1) fibrous filler is 5 to 50 占 퐉, the preferable average fiber length is 5 to 30 占 퐉, and the more preferable average fiber length is 7 to 30 占 퐉. The above average fiber length of 5 탆 or more is necessary in view of maintaining the mechanical strength and the deformation temperature required for the camera module, and 50 탆 or less is necessary from the viewpoint of suppressing brushed surface of the molded article. The average fiber length is obtained by taking a stereoscopic microscope image from a CCD camera into a PC and employing a value measured by an image measuring instrument using an image processing technique.

As the fibrous filler (B1), for example, glass fibers, carbon fibers, asbestos fibers, silica fibers, silica-alumina fibers, zirconia fibers, boron nitride Fibers, silicon nitride fibers, boron fibers, potassium titanate fibers, and fibrous materials of metals such as stainless steel, aluminum, titanium, copper and brass. As the component (B1), two or more 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 plate fillers and particulate fillers having an average particle diameter of 50 mu m or less. The average particle diameter of 50 탆 or less is necessary from the standpoint of suppressing brushed surface of the molded article. The average particle diameter is preferably 10 to 20 占 퐉. The average particle diameter is a value measured by a method of laser diffraction / scattering type particle size distribution measurement.

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

The content of the component (B) (the total of the content of the component (B1) and the content of the component (B2)) is 5 to 20 mass% in the liquid crystal composition for a camera module of the present invention. The content of the component (B) in an amount of 5 mass% or more is necessary from the viewpoint of securing the mechanical strength and the deformation temperature required for the camera module, and 20 mass% or less is necessary from the viewpoint of suppressing brushed surface of the molded article. More preferably, the content is 5 to 15% by mass.

[(C) Copolymer]

The (C) copolymer is at least one member selected from (C1) an olefin-based copolymer and (C2) a styrene-based copolymer. (C) to the liquid crystalline resin composition for a camera module contributes to suppressing the brushed surface of the molded body when the molded body obtained by molding the composition is ultrasonically cleaned.

The reason for suppressing the brushed is not clearly revealed, but it is considered that by blending a certain amount, the surface state of the formed body is changed, and the change contributes to suppressing the brushed.

(C1) The olefin-based copolymer is composed of an? -Olefin and a glycidyl ester of an?,? - unsaturated acid.

The? -olefin is not particularly limited and includes, for example, ethylene, propylene, and butene, among which ethylene is preferably used. The glycidyl ester of an alpha, beta -unsaturated acid is represented by the following general formula (IV). The glycidyl ester unit of the?,? - unsaturated acid is, for example, glycidyl acrylate ester, glycidyl methacrylate ester, glycidyl ethacrylate ester, glycidyl esters of itaconic acid, The acid glycidyl ester is preferred.

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

The (C1) olefin-based copolymer used in the present invention may contain, in addition to the above two components, acrylonitrile, acrylic acid ester, methacrylic acid ester,? -Methylstyrene, maleic anhydride Based on 100 parts by mass of the above two components may be contained in an amount of 0 to 48 parts by mass.

The olefin-based copolymer (C1) of the present invention can be easily prepared by a conventional radical polymerization method using a monomer of each component and a radical polymerization catalyst. More specifically, usually, the? -Olefin and the glycidyl ester of?,? - unsaturated acid are reacted in the presence of a radical generator at 500 to 4000 atm and 100 to 300 ° C in the presence or absence of a suitable solvent or chain transfer agent Followed by copolymerization. It is also possible to prepare by melt-graft copolymerizing an α-olefin with a glycidyl ester of an α, β-unsaturated acid and a radical generator in an extruder.

(C2) is composed of styrenes and glycidyl esters of?,? - unsaturated acids. The glycidyl ester of the?,? - unsaturated acid is the same as that described in the component (C1), and thus the description thereof is omitted.

Examples of the styrene include styrene,? -Methylstyrene, styrene bromide and divinylbenzene, and styrene is preferably used.

The (C2) styrenic copolymer used in the present invention may be a multi-component copolymer obtained by copolymerizing at least one other vinyl monomer as the third component in addition to the above two components. Suitable as the third component are one or more olefinic unsaturated esters such as acrylonitrile, acrylic acid ester, methacrylic acid ester and maleic anhydride. A copolymer obtained by introducing repeating units derived therefrom in an amount of 40 mass% or less in the (C2) styrenic copolymer is preferable as the component (C2).

The content of the glycidyl ester of the?,? - unsaturated acid in the (C2) styrenic copolymer is preferably 2 to 20% by mass, and the styrene content is preferably 80 to 98% by mass.

The styrene-based copolymer (C2) can be prepared by a conventional radical polymerization method using a monomer of each component and a radical polymerization catalyst. More specifically, usually, styrenes and glycidyl esters of?,? - unsaturated acids are copolymerized in the presence of a radical generator at 500 to 4000 atm and 100 to 300 ° C in the presence or absence of a suitable solvent or chain transfer agent And the like. It is also possible to prepare by a method in which styrene is mixed with a glycidyl ester of an alpha, beta -unsaturated acid and a radical generator and subjected to melt graft copolymerization in an extruder.

As the (C) copolymer, the (C1) olefin-based copolymer is preferable in view of heat resistance, but the ratio of the component (C1) to the component (C2) can be selected in accordance with suitably required properties.

The content of the (C) copolymer (the total amount of the (C1) component and the (C2) component) is 2 to 10 mass% in the resin composition for a camera module of the present invention. When the content of the component (C) is 2 mass% or more, it is necessary from the viewpoint of preventing the surface of the molded article from being brushed, and 10 mass% or less is necessary for obtaining a good molded article without inhibiting the fluidity. 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 generally available for use in resin coloring, but usually contains lumps formed by agglomeration of primary particles. Lumps of lumps (Protrusions (fine irregularities) such as minute fine irregularities in which carbon black is aggregated) on the surface of a molded article obtained by molding the resin composition of the present invention is undesirably formed. It is necessary that the particle size of the lump form is 20 ppm or less in terms of particle size of 50 탆 or more from the viewpoint of suppressing brushed surface of the molded article. The preferable content is 5 ppm or less.

The blending amount of (D) carbon black is preferably in the range of 1 to 5% by mass in the liquid crystalline resin composition for a camera module. If the amount of the carbon black is less than 1 part by mass, the resulting resin composition may have low luster and light-shielding properties become unstable, and if it exceeds 5 parts by mass, the resin composition may become uneconomical, and the possibility of occurrence of narrow protrusions may increase.

[Other ingredients]

To the liquid crystal resin composition for a camera module of the present invention, other polymers, generally known substances added to synthetic resins, such as stabilizers such as antioxidants and ultraviolet absorbers, antistatic agents, Colorants such as flame retardants, dyes and pigments, lubricants, release agents, crystallization accelerators, crystal nucleating agents and the like can be suitably added in accordance with 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 components (A), (B) and (C) are added and compounded and melt-kneaded using a monoaxial or twin screw extruder to prepare a liquid crystalline resin composition for a camera module.

[Liquid crystalline resin composition for camera module]

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 it is blended. The shape of the above-mentioned component (B) is a shape before being blended. If the shape before compounding is as described above, a component for a camera module in which the surface is not easily brushed can be obtained.

The liquid crystalline resin composition for a camera module of the present invention thus obtained preferably has a melt viscosity of 50 Pa · sec or less. High fluidity and excellent moldability are also features of the liquid crystalline resin composition for a camera module of the present invention. Here, the melt viscosity is a value obtained by a measurement method in accordance with ISO 11443 under the conditions of a cylinder temperature of 350 ° C and a shear rate of 1000 sec ^-1 .

The liquid crystal resin composition for a camera module of the present invention preferably has a load deformation temperature of 200 ° C or higher. Heat resistance is also one of the characteristics of the liquid crystal resin composition for a camera module of the present invention. The load deformation temperature adopts the value measured in accordance with ISO 75-1, 2.

<Components for camera module>

A component for a camera module is manufactured using the liquid crystalline resin composition for a camera module. When the resin composition of the present invention is used as a raw material, the surface of a component for a camera module does not easily wrinkle. Since the components for the camera module are ultrasonically cleaned, the surface should not be easily brushed even when ultrasonic cleaning is performed. When the resin composition of the present invention is used, even if ultrasonic cleaning of a component for a camera module is carried out under stronger conditions, a dropout that causes dust or the like is not generated or hardly occurs. Accordingly, after the parts for the camera module are assembled into the finished product, the surface of the parts for the camera module is dust that is generated by brushed and hardly affects the quality of the finished product.

A component for a camera module formed by molding a liquid crystal resin composition for a camera module of the present invention will be described. A cross section of a typical camera module is schematically 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, and 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 to each other by the 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 in the opening wall.

The barrel 14 has a cylindrical shape, and the lens 15 is held in a substantially cylindrical shape. The helical convex portion and the helical groove portion formed on the opening wall surface of the holder 13 are screwed into each other so that the barrel 14 is held by the holder 13 ). An IR filter 16 is disposed at one end of the barrel 14 so as to cover 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 shown in Fig. 1, the distance between the lens 15 and the optical element 11 changes as the barrel 14 rotates. By adjusting this distance, the focus of the camera can be adjusted.

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

In a molded article obtained by molding a general liquid crystalline resin composition, since the molecular orientation of the polymer is particularly large at the surface portion, the surface of the molded article tends to be wrinkled, and such a brushed shape causes a small amount of dust. When such a small particle is attached to the lens 15 or the like, the performance of the camera module deteriorates.

The components for the camera module such as the holder 13 and the barrel 14 are ultrasonically cleaned before being assembled to the camera module 1 for the purpose of removing dust on the surface or small particles. However, since the surface of a molded article obtained by molding a general liquid crystalline resin composition is easy to wrinkle, the surface of the molded article is napped by ultrasonic cleaning. In view of such a problem, a molded article obtained by molding a liquid crystalline resin composition can not be ultrasonically cleaned.

The focus adjustment is performed by moving a helical groove portion formed on the opening wall surface of the holder 13 with a helical convex portion formed on the side wall of the end portion of the barrel 14. [ At this time, the spiral grooves and the helical convex portions are mutually struck at the contact surfaces. As described above, since the surface of the molded article molded from a general liquid crystalline resin composition tends to be wrinkled, there is a possibility that the surface is peeled off and a peeled product is generated. Such peeling material becomes small dust and attached to the lens 15 or the like, and there is a high possibility that the performance of the camera module is deteriorated.

As described above, the liquid crystal resin composition can not generally be used as a raw material for the holder 13 and the barrel 14. However, when the liquid crystal resin composition for a camera module of the present invention is made into a molded body, The surface state of the molded article is improved to such an extent that the problem of brushed is hardly generated. Therefore, it can be suitably used as a raw material for the holder 13 and the barrel 14.

[ Example ]

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited 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 (potassium titanate fiber, average fiber diameter 0.3 to 0.6 mu m, average fiber length 10 to 20 mu m) manufactured by Otsuka Chemical Co.,

Fibrous filler 2: PF70E-001 (glass fiber glass with a diameter of 10 mu m, weight average length of 70 mu m) manufactured by Nitto Denshi Co.,

Non-fibrous filler 1: Crown Talc PP (talc, average particle diameter 12.8 占 퐉, average aspect ratio 6), manufactured by Matsumura Industrial Co.,

Non-fibrous filler 2: AB-25 S (mica, mean particle size: 24 탆) manufactured by Yamaguchi Mica Co.,

Non-fibrous filler 3: A-41 S (mica, average particle diameter: 47 탆) manufactured by Yamaguchi Mica Co.,

Olefin-based copolymer: Bond Fast 2C (containing 6 wt% of glycidyl methacrylate) (ethylene-glycidyl methacrylate copolymer) manufactured by Sumitomo Chemical Co., Ltd.)

Carbon black: VULCAN XC305 (carbon black, average particle diameter of 20 nm, particle diameter of not less than 20 ppm, not less than 50 μm in particle size, manufactured by Cabot Japan Co., Ltd.)

&Lt; Production of liquid crystal resin composition for camera module >

The above components were melted and kneaded at a cylinder temperature of 350 占 폚 using a twin-screw extruder (TEX30? Type, manufactured by Nippon Seiko Kogyo Co., Ltd.) at the ratios shown in Table 1 to obtain liquid crystalline resin composition pellets for a camera module.

&Lt; Melting point &

The melt viscosity of the liquid crystalline resin composition for a camera module in Examples and Comparative Examples was measured using the above pellets. More specifically, the melt viscosity of the appearance under the conditions of a cylinder temperature of 350 ° C and a shear rate of 1000 sec ^-1 is measured by a capillary rheometer (Capillograph 1D: piston diameter 10 mm, manufactured by TOYO SEIKI Co., Ltd.) Respectively. 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.

<Rod flowability test>

 The fluidity of the liquid crystalline resin composition for a camera module in Examples and Comparative Examples was evaluated using the above pellets. Specifically, the pellet was molded into a test piece having a thickness of 0.3 mm using a molding machine (&quot; E30DUZ &quot; manufactured by Sumitomo Heavy Industries, Ltd.) under the following molding conditions. The flowability was evaluated by measuring the length of the obtained molded body. The evaluation results are shown in Table 1.

〔Molding conditions〕

Cylinder temperature: 350 ° C

Mold temperature: 80 ℃

Injection pressure: 100 MPa

Injection speed: 200mm / sec

&Lt; Evaluation of brushed state (surface brushed-down effect) of molded article surface &

The pellets of Examples and Comparative Examples were molded under the following molding conditions using a molding machine (&quot; E30DUZ &quot; manufactured by Sumitomo Heavy Industries, Ltd.) to obtain a molded article of 12.5 mm x 120 mm x 0.8 mm. .

〔Molding conditions〕

Cylinder temperature: 350 ° C

Mold temperature: 90 ℃

Injection speed: 80mm / sec

〔evaluation〕

The molded body cut in half was placed in an ultrasonic cleaner (output: 300 W, frequency: 45 kHz) in water (room temperature) at room temperature for 3 minutes. Thereafter, the molded article before and after being applied to the ultrasonic cleaner were compared, and the area (bristle area) of the portion where the nap portion was formed on the surface of the molded article was evaluated with an image measuring device (LUZEXFS manufactured by Nireco). The evaluation area is 750 mm ² (12.5 mm 60 mm). The evaluation results are shown in Table 1.

The smaller the bristle area, the higher the bristle suppression effect.

<Load deformation temperature>

The pellets of Examples and Comparative Examples were molded into test pieces (4 mm x 10 mm x 80 mm) for measurement under the following molding conditions using a molding machine ("E100DU" manufactured by Sumitomo Heavy Industries, Ltd.). Thereafter, the load deformation temperature was measured in accordance with ISO 75-1,2. The measurement results are shown in Table 1.

〔Molding conditions〕

Cylinder temperature: 350 ° C

Mold temperature: 80 ℃

Back pressure: 2.0 MPa

Injection speed: 33mm / sec

&Lt; Charpy impact test &

The pellets of Examples and Comparative Examples were molded into test pieces (4 mm x 10 mm x 80 mm) for measurement under the following molding conditions using a molding machine ("E100DU" manufactured by Sumitomo Heavy Industries, Ltd.) The Charpy impact value was measured by one method.

〔Molding conditions〕

Cylinder temperature: 350 ° C

Mold temperature: 80 ℃

Back pressure: 2.0 MPa

Injection speed: 33mm / sec

As is evident from the results shown in Table 1, it was confirmed that the molded article produced by using the pellets of the examples did not have napping on the surface even when subjected to ultrasonic cleaning. From these results, it can be said that the molded article obtained by molding the pellets of the examples is significantly different in surface state from the molded article obtained by molding the ordinary liquid crystalline resin composition pellets such as the comparative example.

Further, it was confirmed that the molded articles produced by using the pellets of the examples had excellent heat resistance, excellent fluidity, and excellent impact resistance.

1 camera module
10 substrate
11 optical element
12 lead wiring
13 Holder
14 barrels
15 lens
16 IR filter

Claims (3)

(A) a liquid crystalline resin,
(B) an inorganic filler selected from the group consisting of (B1) a fibrous filler and (B2) a non-fibrous filler,
(C) a copolymer selected from an olefin-based copolymer (C1) and a styrene-based copolymer (C2)
(A) is contained in an amount of 65 to 93 mass%, (B) is contained in an amount of 5 to 20 mass%, and (C) is contained in an amount of 2 to 10 mass%
The fibrous filler (B1) has an average fiber diameter of 1.0 탆 or less and an average fiber length of 5 to 50 탆,
The non-fibrous filler (B2) is at least one selected from platelet fillers and particulate fillers having an average particle diameter of 50 탆 or less,
The olefin-based copolymer (C1) is composed of an? -Olefin and a glycidyl ester of an?,? - unsaturated acid,
Wherein the styrene-based copolymer (C2) is a copolymer of styrene and a glycidyl ester of?,? - unsaturated acid selected from the group consisting of styrene,? -Methylstyrene, styrene bromide and divinylbenzene Liquid crystalline resin composition. The method according to claim 1,
And the average particle diameter of the non-fibrous filler (B2) is 10 to 20 占 퐉. 3. The method according to claim 1 or 2,
(D) carbon black so that the content thereof is 1 to 5% by mass.

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