TW201639908A - Liquid crystal resin composition for camera modules - Google Patents

Abstract

Provided is a liquid crystal resin composition for camera modules, which is used for the purpose of producing a camera module component. The surface of a molded body of this liquid crystal resin composition for camera modules is not easily raised. This resin composition is obtained by blending at least one kind of (B) an inorganic filler that is selected from among (B1) fibrous fillers and (B2) non-fibrous fillers and at least one kind of (C) a copolymer that is selected from among (C1) olefin copolymers and (C2) styrene copolymers into (A) a liquid crystal resin, so that the component (A) is 65-93% by mass, the component (B) is 5-20% by mass and the component (C) is 2-10% by mass. The component (B1) has an average fiber diameter of 1.0 [mu]m or less and an average fiber length of 5-50 [mu]m, and the component (B2) is at least one filler that is selected from among plate-like fillers and granular fillers having an average particle diameter of 50 [mu]m or less. The component (C1) and the component (C2) are respectively configured of specific components.

Description

Liquid crystal resin composition for camera module

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

The liquid crystalline resin represented by the liquid crystalline polyester resin has excellent mechanical strength, heat resistance, chemical resistance, electrical properties, etc., and has excellent dimensional stability, so it is widely used as a high-performance engineering. plastic. Recently, liquid crystal resins have been used effectively for precision machine parts by utilizing these advantages.

Precision machines, especially in the case of optical machines with lenses, can cause effects on machine performance due to small amounts of garbage and dust. For example, when used in a part of an optical machine such as a camera module, small trash, oil, and dust adhere to the lens, which significantly degrades the optical characteristics of the camera module. In order to prevent such a decrease in optical characteristics, generally, the components constituting the camera module (hereinafter referred to as "parts for camera modules") are ultrasonically cleaned before assembly and adhered to the surface. Small garbage, oil, dust, etc. are removed.

As described above, in the molded article obtained by molding the liquid crystalline resin composition, since the molecular alignment of the polymer is particularly large on the surface portion and the surface of the molded body is easily peeled off, the molded body is ultrasonically cleaned to cause surface peeling and fuzzing. Phenomenon, and the fluffing part of the fluffing becomes the cause of small garbage.

Therefore, the liquid crystalline resin composition is used as a camera module In the case of the raw material of the part, a special liquid crystalline resin composition which does not swell on the surface of the molded body even if the molded body is ultrasonically washed is used. The liquid crystal resin composition containing a liquid crystal resin and a specific talc powder and carbon black is disclosed as a liquid crystal resin composition (see Patent Document 1).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2009-242453

However, in the study of the present inventors, the liquid crystal resin composition for a camera module disclosed in Patent Document 1 is not sufficient for suppressing the raising of the surface of the molded body, and the camera module of the molded body in which the surface of the molded body is less likely to be raised is required. A liquid crystalline resin composition is used.

The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a liquid crystal resin composition for a camera module which is a component for a camera module which is not easy to be raised on the surface.

The present inventors focused on the above research in order to solve the above problems. As a result, it has been found that the above liquid crystal resin, a specific inorganic filler, and a specific copolymer can be prepared by blending the liquid crystal resin composition for a camera with a specific blend. More specifically, the present invention provides the following.

(1) A liquid crystalline resin composition for a camera module, which is paired (A) Liquid crystalline resin, blended: (B) an inorganic filler selected from at least one of (B1) fibrous filler and (B2) non-fibrous filler; (C) copolymer, which is selected At least one of the free (C1) olefin-based copolymer and the (C2) styrene-based copolymer is such that the component (A) is 65 to 93% by mass, the component (B) is 5 to 20% by mass, and the component (C) is 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, and the (B2) non-fibrous filler has an average particle diameter of 2 to 10% by mass. 50 μm or less is at least one selected from the group consisting of a plate-like filler and a particulate filler, and the (C1) olefin-based copolymer is composed of an α-olefin and a glycidyl ester of an α,β-unsaturated acid. C2) A styrene-based copolymer composed of a styrene compound and a glycidyl ester of an α,β-unsaturated acid.

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

(3) The liquid crystalline resin composition for a camera module according to (1) or (2), wherein the (D) carbon black is further blended in an amount of 1 to 5% by mass.

By using the liquid crystal resin composition for a camera module of the present invention as a raw material to manufacture a component for a camera module, it is possible to obtain a component for a camera module whose surface is not easily raised.

1‧‧‧ camera module

10‧‧‧Substrate

11‧‧‧Optical components

12‧‧‧ wire

13‧‧‧ frames

14‧‧‧Mirror tube

15‧‧‧ lens

16‧‧‧IR filter

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

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

<Liquid Crystal Resin Composition for Camera Module>

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

[(A) Liquid Crystal Resin]

The (A) liquid crystalline resin used in the present invention means a melt-processable polymer having a property of forming an optically anisotropic molten phase. The nature of the anisotropic melt phase can be confirmed by a conventional polarizing inspection method using a crossed polarizer. More specifically, the confirmation of the anisotropic melt phase was carried out by observing a molten sample placed on a Leitz heating stage under a nitrogen atmosphere at a magnification of 40 times using a Leitz polarizing microscope. The liquid crystalline polymer which can be suitably used in the present invention, when examined between orthogonal polarizers, allows the polarized light to be generally penetrated even when it is in a molten stationary state, thereby exhibiting optical anisotropy.

The type of the liquid crystal resin (A) as described above is not particularly limited, and an aromatic polyester or an aromatic polyester decylamine is preferred. Further, a polyester containing an aromatic polyester or an aromatic polyester decylamine in a portion of the same molecular chain is also in its range. When the concentration is equal to 60 ° C and the pentafluorophenol is melted at a concentration of 0.1% by weight, it has a logarithmic viscosity (I.V.) of at least about 2.0 dl/g, more preferably 2.0 to 10.0 dl/g.

The aromatic polyester or aromatic polyester decylamine which can be suitably used in the (A) liquid crystalline resin of the present invention, particularly preferably has a group selected from the group consisting of aromatic hydroxycarboxylic acids, aromatic hydroxylamines, and aromatic diamines. At least one or more compounds are used as a constituent aromatic polyester or an aromatic polyester decylamine.

More specifically, (1) is mainly composed of one or more of an aromatic hydroxycarboxylic acid and a derivative thereof. (2) mainly composed of (a) one or more kinds of aromatic hydroxycarboxylic acids and derivatives thereof, (b) aromatic dicarboxylic acids, alicyclic dicarboxylic acids and derivatives thereof a polyester composed of at least one or two or more of (1) an aromatic diol, an alicyclic diol, an aliphatic diol, and a derivative thereof; (3) mainly composed of ( a) one or more of an aromatic hydroxycarboxylic acid and a derivative thereof, (b) one or more of an aromatic hydroxylamine, an aromatic diamine, and a derivative thereof, and (c) an aromatic two a polyester decyl amine composed of one or more of a carboxylic acid, an alicyclic dicarboxylic acid, and a derivative thereof; (4) mainly one or two of (a) an aromatic hydroxycarboxylic acid and a derivative thereof One or more of (b) an aromatic hydroxylamine, an aromatic diamine, and a derivative thereof, and (c) one of an aromatic dicarboxylic acid, an alicyclic dicarboxylic acid, and a derivative thereof or Two or more kinds of polyester phthalamides, which are composed of at least one or two or more kinds of aromatic diols, alicyclic diols, aliphatic diols and derivatives thereof, and the like. Further, the above-mentioned constituent components may be used in combination with a molecular weight modifier.

Preferred examples of the specific compound (A) constituting the liquid crystalline resin of the present invention include aromatic hydroxycarboxylic acids such as hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid, and 2,6- Dihydroxynaphthalene, 1,4-dihydroxynaphthalene, 4,4'-dihydroxybiphenyl, hydroquinone, resorcinol, a compound represented by the following formula (I) and the following formula (II) Or an aromatic diol; terephthalic acid, isophthalic acid, 4,4'-diphenyldicarboxylic acid, 2,6-naphthalenedicarboxylic acid, a compound represented by the following formula (III), etc. An aromatic dicarboxylic acid; an aromatic amine such as an aminophenol or a p-phenylenediamine.

(X: selected from the group consisting of alkylene (C1~C4), alkenylene, -O-, -SO-, -SO2-, -S-, -CO-)

(Selected from the group consisting of Y:-(CH2)n-(n=1~4), -O(CH2)nO-(n=1~4).)

The preparation of the (A) liquid crystalline resin used in the present invention can be carried out by a conventional method using a direct polymerization method or a transesterification method of the above monomer compound (or a mixture of monomers), usually using a melt polymerization method or a slurry polymerization method. Law and so on. The above compounds having an ester forming ability may be polymerized in a prototype form, or may be formed from a precursor in a stage before the polymerization to have a derivative having the ester forming ability. In the polymerization, various catalysts can be used, and representative examples thereof include dialkyltin oxides, diaryltin oxides, titanium oxides, alkoxytitanates, and alkoxides. A carboxylic acid base and an alkaline earth metal salt, such as a Lewis acid of BF ₃ . The amount of the catalyst used is generally from about 0.001 to 1% by mass based on the total weight of the monomers, and particularly preferably from 0.01 to 0.2% by mass. The polymer produced by the polymerization method can further increase the molecular weight by solid phase polymerization under reduced pressure or heating in an inert gas as necessary.

The melt viscosity of the (A) liquid crystalline resin obtained by the above method is not particularly limited. Generally, the melt viscosity for the molding temperature can be set to be 10 MPa or more and 600 MPa or less at a shear rate of 1000 sec ^-1 . However, if it is too high in viscosity itself, the liquidity will deteriorate very badly. Further, the liquid crystal resin (A) may be a mixture of two or more liquid crystal resins.

The content of the (A) liquid crystalline resin in the liquid crystalline resin composition for a camera module of the present invention is 65 to 93% by mass. When the content of the component (A) is at least 65 mass%, the reason for the fluidity and the occurrence of fuzzing on the surface of the molded article is preferable. When the content of the component (A) is 93% by mass or less, the reason for the heat resistance is preferable. Further, a preferred content of the component (A) is from 80 to 93% by mass.

[(B) Inorganic filler]

(B) The inorganic filler is selected from the group consisting of (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 of them.

Further, the (B1) fibrous filler has an average fiber diameter of 1.0 μm or less, and preferably has an average fiber diameter of 0.3 to 0.6 μm. The above average fiber diameter needs to be 1.0 μm or less at the point of suppressing the raising of the surface of the molded body. Furthermore, the average fiber diameter is obtained by taking a solid microscope image from a CCD camera into a PC and measuring the value by an image processing method using an image processing method.

Further, the (B1) fibrous filler has an average fiber length of 5 to 50 μm, an average fiber length of 5 to 30 μm, and an average fiber length of 7 to 30 μm. The average fiber length is required to maintain the mechanical strength required for the camera module, and the load bending temperature needs to be 5 μm or more, and the raising of the surface of the molded body is required to be 50 μm or less. Furthermore, the average fiber length is obtained by taking a solid microscope image from a CCD camera into a PC and measuring the value by an image processing method using an image processing method.

Any fibrous, (B1) fibrous filler may be used as long as it is a fibrous filler satisfying the above shape, and examples thereof include glass fiber, carbon fiber, asbestos fiber, cerium oxide fiber, aluminum silicate fiber, and zirconia fiber. , boron nitride fiber, tantalum nitride fiber, boron fiber, potassium titanate fiber, and stainless steel, aluminum, An inorganic fibrous material such as a fibrous material of a metal such as titanium, copper or brass. Two or more kinds of fibrous fillers may be used as the component (B1). In the component (B1) of the present invention, potassium titanate fibers are preferably used.

(B2) The non-fibrous filler is at least one selected from the group consisting of a plate-shaped filler having an average particle diameter of 50 μm or less and a particulate filler. The above average particle diameter needs to be 50 μm or less in suppressing the raising of the surface of the molded body. The above average particle diameter is preferably 10 to 20 μm. Further, the average particle diameter is a value measured by a laser diffraction/scattering particle size distribution measuring method.

Any filler or plate-like filler may be used as long as it is a non-fibrous filler satisfying the above shape, and examples thereof include talc, mica, glass flakes, various metal foils, and the like. Further, the particulate filler may, for example, be cerium oxide, quartz powder, glass beads, glass powder, calcium citrate, aluminum silicate, kaolin, clay, diatomaceous earth, strontium silicate, such as iron oxide. An oxide of a metal such as titanium oxide, zinc oxide or aluminum oxide, a metal carbonate such as calcium carbonate or magnesium carbonate, a metal sulfate such as calcium sulfate or barium sulfate, other tantalum carbide, tantalum nitride, boron nitride, Various metal powders, etc. Two or more types of (B2) components can be used. In the present invention, the component (B2) is preferably talc powder using a plate-like filler, mica or a granulated filler of cerium oxide, and talc powder or mica using a plate-like filler is more preferable.

The content of the component (B) (the total content of the component (B1) and the content of the component (B2)) is 5 to 20% by mass in the liquid crystal composition for a camera module of the present invention. The content of the component (B) is required to ensure the mechanical strength and load bending temperature required for the camera module to be 5% by mass or more, and to suppress the surface of the molded body to be 20% by mass or less. The above content is more preferably 5 to 15% by mass.

[(C) Copolymer]

The (C) copolymer is at least one selected from the group consisting of a (C1) olefin-based copolymer and a (C2) styrene-based copolymer. When the component (C) is blended with the liquid crystalline resin composition for a camera module, it contributes to the raising of the surface of the molded body when the molded body obtained by ultrasonically cleaning the composition is suppressed.

Although the reason for suppressing the raising is not clear, it is considered that the state of the surface of the molded body is changed by blending a certain amount, and this change contributes to suppression of fluffing.

(C1) an olefin-based copolymer comprising 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, butylene, and the like, and ethylene is preferably used. The glycidyl ester of an α,β-unsaturated acid is represented by the following formula (IV). Examples of the glycidyl ester unit of the α,β-unsaturated acid include glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylate, glycidyl isoconate, and the like, and glycidyl methacrylate. Especially good.

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

The (C1) olefin-based copolymer used in the present invention may also be an olefin such as acrylonitrile, acrylate, methacrylate, α-methylstyrene or anhydrous maleic acid, without impairing the scope of the present invention. One or two or more kinds of the unsaturated esters are used as the third component other than the above two components, and the two components of the above two components contain 0 to 48 parts by mass.

The olefin-based copolymer of the component (C1) of the present invention can be easily used The monomers of the respective components and the radical polymerization catalyst are prepared by a usual radical polymerization method. More specifically, in general, in the presence of a radical generator, the α-olefin and the glycidyl ester of the α,β-unsaturated acid are at a solvent or a chain at 500 to 4000 atm, 100 to 300 ° C. Manufactured in the presence or absence of a co-polymerization of the mobile agent. Further, it can also be produced by a method in which an α-olefin is mixed with a glycidyl ester of an α,β-unsaturated acid and a radical generator in a melt-graft copolymerization in an extruder.

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

Examples of the styrene include styrene, α-methylstyrene, brominated styrene, and divinylbenzene, and styrene can be preferably used.

The (C2) styrene-based copolymer used in the present invention may be a multicomponent copolymer in which one or more vinyl monomers are copolymerized as a third component other than the above two components. One or two or more kinds of olefin-based unsaturated esters such as acrylonitrile, acrylate, methacrylate, and anhydrous maleic acid are suitable as the third component. It is preferred to introduce a copolymer of 40% by mass or less into the (C2) styrene-based copolymer from the above-mentioned repeating unit as the component (C2).

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

(C2) A styrene-based copolymer can be prepared by a usual radical polymerization method using a monomer of each component or a radical polymerization catalyst. More specifically, the glycidyl ester of styrene and α,β-unsaturated acid is usually in the presence of a radical generating agent at 500 to 4000 atmospheres, 100 to 300 ° C, in an appropriate solvent or chain. Manufactured in the presence or absence of a co-polymerization of the mobile agent. Further, it can also be produced by a method in which a styrene compound is mixed with a glycidyl ester of an α,β-unsaturated acid and a radical generator in a melt-graft copolymerization in an extruder.

Further, the (C) copolymer is preferably a (C1) olefin-based copolymer in terms of heat resistance, and the ratio of the (C1) component to the (C2) component can be appropriately selected according to the desired characteristics.

(C) The content of the copolymer (the total amount of the component (C1) and the component (C2)) is 2 to 10% by mass in the resin composition for a camera module of the present invention. The content of the component (C) is required to be 2% by mass or more at the point of suppressing the raising of the surface of the molded article, and 10% by mass or less is required for obtaining a favorable molded body without impairing the fluidity. The above content is more preferably 2 to 7% by mass.

[(D) carbon black]

The (D) carbon black used in the present invention is not limited to a general one for coloring of a resin, but usually contains agglomerates in which primary particles are agglomerated, and remarkably contains a plurality of blocks having a size of 50 μm or more. In the case of the molded article obtained by molding the resin composition of the present invention, a large number of protrusions (fine fine particles (fine irregularities) in which carbon black is agglomerated) are not preferable. The particles having a bulk particle diameter of 50 μm or more need to be 20 ppm or less at the point of suppressing the raising of the surface of the molded body. The content is preferably 5 ppm or less.

(D) The blending amount of the carbon black is preferably in the range of 1 to 5% by mass in the liquid crystalline resin composition for a camera module. When the blending amount of the carbon black is less than 1 part by mass, the blackening property of the obtained resin composition is lowered, and there is a concern about the light-shielding property. When it exceeds 5 mass parts, it is uneconomical, and the possibility of occurrence of protrusions becomes high.

[other ingredients]

In the liquid crystal resin composition for a camera module of the present invention, other polymers may be generally added to a conventional resin, that is, an oxidation preventive agent or ultraviolet light absorption, without departing from the effects of the present invention. A stabilizer such as a stabilizer, a charge inhibitor, a flame retardant, a dye or a pigment, a lubricant, a mold release agent, a crystallization accelerator, a crystal nucleating agent, and the like are preferably added in accordance with the required properties.

[Modulation of Liquid Crystal 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 to each other, and the mixture is melt-kneaded by a uniaxial or 2-axis extruder to prepare a liquid crystal resin composition for a camera module.

[Liquid Crystal 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 blending. The shape of the above component (B) is the shape before blending. The shape before the blending is as described above, and the parts for the camera module which are not easily raised on the surface can be obtained.

The liquid crystalline resin composition for a camera module of the present invention obtained as described above has a melt viscosity of 50 Pa. The following is better than sec. The liquid crystal resin composition for a camera module of the present invention is one of the features of the liquid crystal resin composition for a camera module of the present invention. Here, the melt viscosity is a value obtained by a measurement method of ISO 11443 using a condition that the tube temperature is 350 ° C and the shear rate is 1000 sec ^-1 .

In the liquid crystalline resin composition for a camera module of the present invention, the load bending temperature is preferably 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. Further, the load bending temperature is a value measured in accordance with the method of ISO 75-1, 2.

<Parts for camera module>

A component for a camera module is produced by using the liquid crystal resin composition for a camera module described above. When the resin composition of the present invention is used as a raw material, the surface of the component for a camera module is not easily raised. Parts for camera modules are ultrasonically cleaned, so it is not easy to fluff even if they are cleaned by ultrasonic waves. According to the resin composition of the present invention, even if the camera module parts are ultrasonically cleaned under more intense conditions, there is no possibility of falling off due to garbage or the like, or hardly occurring. Therefore, after the components for the camera module are assembled into the finished product, there is almost no waste generated by the surface of the components of the camera module, which affects the quality of the finished product.

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

The optical element 11 is disposed on the substrate 10 and electrically connected between the optical element 11 and the substrate 10 by a wire 12 .

The frame 13 is disposed on the substrate 10 and covers the optical element 11. An opening is formed in a top portion of the frame 13, and a spiral groove portion is formed on the opening wall surface.

The lens barrel 14 is cylindrical, and the lens 15 is held slightly horizontally inside the cylindrical shape. Further, a spiral convex portion is formed on a side wall of one end of the cylinder, and the spiral convex portion is screwed with a spiral groove formed on the open wall surface of the frame 13, the lens barrel 14 and the frame 13 connections. Further, one end of the cylindrical lens barrel 14 is closed, and the IR filter 16 is disposed at one end of the lens barrel 14. As shown in Fig. 1, the IR filter 16 is arranged substantially in parallel with the lens 15.

As shown in Fig. 1, the camera module 1 can change the distance between the lens 15 and the optical element 11 by rotating the lens barrel 14. The focus adjustment of the camera can be performed by adjusting the distance.

In the camera module 1 as described above, the lens holder 13 for the camera module and the lens barrel 14 can be produced using the liquid crystal resin composition for a camera module of the present invention as a raw material. The general liquid crystalline resin composition is not suitable as a raw material for manufacturing such parts. When the frame 13 or the lens barrel 14 is produced using a general liquid crystalline resin composition as a raw material, the following problems occur.

In the molded article obtained by molding a general liquid crystalline resin composition, since the molecular alignment of the polymer is particularly large on the surface portion, it is easy to fluff the surface of the molded body, which causes a small amount of garbage to occur. If the small garbage adheres to the lens 15 or the like, the performance of the camera module is degraded.

The components for the camera module such as the frame 13 and the lens barrel 14 are ultrasonically cleaned before being incorporated into the camera module 1 for the purpose of removing dust and small garbage on the surface. However, in the molded body formed by the general liquid crystalline resin composition, since the surface is easily raised, the ultrasonic cleaning causes fuzzing on the surface. Since such a problem occurs, usually, the molded body obtained by molding the liquid crystalline resin composition cannot be ultrasonically cleaned.

The focus adjustment is performed on a spiral convex portion formed on the side wall of the end portion of the lens barrel 14, and is moved by a spiral groove formed on the opening wall surface of the frame 13. At this time, the spiral groove portion and the spiral convex portion rub against each other at the contact surface. As described above, the molded article obtained by molding a general liquid crystalline resin composition is likely to be raised on the surface, so that the surface is peeled off to cause peeling. possibility. This peeling material has a small amount of garbage and adheres to the lens 15 or the like, and the performance of the camera module is likely to be lowered.

As described above, in general, the liquid crystal resin composition cannot be used as the material of the frame 13 and the lens barrel 14. However, when the liquid crystal resin composition for a camera module of the present invention is used as a molded body, the surface state of the molded body is obtained. In addition, even if the molded body is ultrasonically cleaned, the problem of fluffing hardly occurs, so that it can be favorably used as a material for the frame 13 and the lens barrel 14.

[Examples]

The invention is illustrated in more detail in the following examples, but the invention should not be construed as limited.

<material>

Liquid crystal resin (liquid crystalline polyester phthalamide resin): Vectra (registered trademark) E950i (manufactured by Polyplastic Co., Ltd.)

Fibrous filler 1: TISSO N-102 (potassium titanate fiber, average fiber diameter 0.3~0.6μm, average fiber length 10~20μm) manufactured by Otsuka Chemical Co., Ltd.

Fibrous filler 2: PF70E-001 manufactured by Nippon Textile Co., Ltd. (ground glass fiber, fiber diameter 10 μm, weight average length 70 μm)

Non-fibrous filler 1: Matsumura Industry Co., Ltd., Crowntalc PP (talc powder, average particle size 12.8 μm, average aspect ratio 6)

Non-fibrous filler 2: (manufactured) Yamaguchi mica industrial AB-25S (mica, average particle size 24 μm)

Non-fibrous filler 3: (manufactured) Yamaguchi Mica Industrial A-41S (mica, average particle size 47 μm)

Olefin Copolymer: Bondfast 2C (ethylene-methyl propyl) manufactured by Sumitomo Chemical Co., Ltd. Glycidyl acrylate copolymer (containing 6 wt% of glycidyl methacrylate))

Carbon black: VULCAN XC305 (carbon black, average particle size 20 nm, particle size 50 μm or more, 20 ppm or less, granular) by Cabot Japan Co., Ltd.

<Manufacture of Liquid Crystal Resin Composition for Camera Module>

The above-mentioned components were melt-kneaded at a tube temperature of 350 ° C in a biaxial extruder (TEX30α type manufactured by Nippon Steel Co., Ltd.) in the ratio shown in the first table to obtain a liquid crystal resin composition for a camera module. grain.

<Fused viscosity>

The melt viscosity of the liquid crystalline resin composition for camera modules of the examples and the comparative examples was measured using the above-mentioned micelles. Specifically, the apparent melt viscosity was measured in accordance with ISO 11443 by a capillary rheometer (Toyo Seiki Co., Ltd., CAPILOGRAPH 1D: push rod diameter: 10 mm) at a tube temperature of 350 ° C and a shear rate of 1000 sec ^-1 . For the measurement, an orifice having an inner diameter of 1 mm and a length of 20 mm was used. Furthermore, the measurement results are shown in the first table.

<rod fluidity test>

The fluidity of the liquid crystalline resin composition for camera modules of the examples and the comparative examples was evaluated using the above-mentioned micelles. Specifically, the above-mentioned rubber pellets were molded into a test piece having a thickness of 0.3 mm 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 obtained shaped body. Furthermore, the measurement results are shown in the first table.

[forming conditions]

Tube temperature: 350 ° C

Metal mold temperature: 80 ° C

Injection pressure: 100MPa

Injection speed: 200mm/sec

<Evaluation of the raising state of the surface of the molded body (surface raising suppressing effect)>

The pellets of the examples and the 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. The test piece was cut into half as a test piece.

[forming conditions]

Tube temperature: 350 ° C

Metal mold temperature: 90 ° C

Injection speed: 80mm/sec

[assessment]

The formed body was cut into half and applied in a room temperature water for 3 minutes with an ultrasonic cleaner (output 300 W, frequency 45 kHz). Thereafter, the molded body before and after the application of the ultrasonic cleaner was compared, and the area (hair raising area) of the raised portion on the surface of the molded body was evaluated by an image measuring device (Nireco LUZEX FS). Furthermore, the evaluation area was 750 mm ² (12.5 mm × 60 mm). The measurement results are shown in the first table.

The smaller the raised area, the higher the fuzzing effect was evaluated.

<Load bending temperature>

In the pellets of the examples and the comparative examples, a test piece for measurement (4 mm × 10 mm × 80 mm) was molded under the following molding conditions using a molding machine ("SE100DU" manufactured by Sumitomo Heavy Industries, Ltd.). Thereafter, the load bending temperature was measured in accordance with the method of ISO 75-1, 2. The measurement results are shown in the first table.

[forming conditions]

Tube temperature: 350 ° C

Metal mold temperature: 80 ° C

Back pressure: 2.0MPa

Injection speed: 33mm/sec

<Charpy impact test>

In the pellets of the examples and the comparative examples, a test piece for measurement (4 mm × 10 mm × 80 mm) was molded under the following molding conditions using a molding machine ("SE100DU" manufactured by Sumitomo Heavy Industries, Ltd.). Thereafter, the Charpy impact test value was measured in accordance with the method of ISO 179-1. The measurement results are shown in the first table.

[forming conditions] [forming conditions]

Tube temperature: 350 ° C

Metal mold temperature: 80 ° C

Back pressure: 2.0MPa

Injection speed: 33mm/sec

[Table 1]

As is apparent from the results described in the first table, it was confirmed that the molded body produced by using the colloidal particles of the examples did not fluff even if the ultrasonic cleaning surface was used. From the result, it can be said that the molded body obtained by molding the colloidal particles of the example and the molded body obtained by molding the colloidal particles of the usual liquid crystalline resin composition such as the comparative example have greatly different surface states.

Further, it was confirmed that the molded body produced by using the pellets of the granules was excellent in heat resistance, excellent in fluidity, and excellent in impact resistance.

1‧‧‧ camera module

10‧‧‧Substrate

11‧‧‧Optical components

12‧‧‧ wire

13‧‧‧ frames

14‧‧‧Mirror tube

15‧‧‧ lens

16‧‧‧IR filter

Claims (4)

A camera module formed of a liquid crystalline resin composition comprising: (A) a liquid crystalline resin; (B) an inorganic filler selected from the group consisting of (B1) fibrous fillers and (B2) at least one of a non-fibrous filler; (C) a copolymer selected from at least one of a (C1) olefin-based copolymer and a (C2) styrene-based copolymer, wherein the liquid crystalline resin In the composition, the content of the component (A) is 65 to 93% by mass, the content of the component (B) is 5 to 20% by mass, and the content of the component (C) is 2 to 10% by mass, and the above (B1) The fibrous filler has an average fiber diameter of 1.0 μm or less and an average fiber length of 5 to 50 μm, and the (B2) non-fibrous filler has an average particle diameter of 50 μm or less selected from the group consisting of a plate-like filler and a granular material. At least one of the fillers, the (C1) olefin-based copolymer is composed of an α-olefin and a glycidyl ester of an α,β-unsaturated acid, and the (C2) styrene-based copolymer is selected from the group consisting of styrene, α - methyl group of consisting of styrene, brominated styrene, divinylbenzene and styrene α, β- unsaturated acid glycidyl esters composed of The camera module of claim 1, wherein the (B2) non-fibrous filler has an average particle diameter of 10 to 20 μm. The camera module of claim 1 or 2, wherein the liquid crystalline resin composition further comprises (D) carbon black, the liquid crystalline resin composition The content of the component (D) is 1 to 5% by mass. A liquid crystalline resin composition for forming a camera module according to any one of claims 1 to 3.