TWI689550B - Liquid crystal resin composition for camera module and camera module using the same - Google Patents

Abstract

The invention provides a liquid crystal resin composition for a camera module. The liquid crystal resin composition for a camera module is used to manufacture a camera module whose surface is not easy to fluff, suppress deformation of bending, improve mechanical strength and have good heat resistance Use parts and improve fluidity during melting. The liquid crystal resin composition for a camera module of the present invention contains (A) liquid crystal resin, (B) fibrous wollastonite, (C) epoxy-containing copolymer and (D) plate-like filler, (A ) The content of the component is 55~95.5% by mass, (B) The content of the component is 2.5~25% by mass, (C) The content of the component is 1.0~4.5% by mass, (D) The content of the component is 10~ 35% by mass, the total content of (B) component and (D) component is 20 to 37.5% by mass.

Description

Liquid crystal resin composition for camera module and camera module using the same

The present invention relates to a liquid crystal resin composition for a camera module and a camera module using the same.

The liquid crystalline resin represented by the liquid crystalline polyester resin is well-balanced and has excellent mechanical strength, heat resistance, chemical resistance, electrical properties, etc., and also has good dimensional stability. Therefore, it is widely used as a high function Engineering plastics. Recently, liquid crystal resins have taken advantage of these characteristics and are used in precision machine parts.

In the state of precision machinery, especially optical machinery with lenses, a small amount of trash, dust, etc., have an impact on mechanical performance. For example, when the parts of the optical machinery used in the camera module are attached to the lens by minute dust, oil components, and dust, the optical characteristics of the camera module are significantly reduced. Due to the purpose of preventing such a decrease in optical characteristics, the components that normally constitute the camera module (in the following, the so-called "camera module parts" state occurs) are ultrasonically washed and removed before assembly Tiny garbage, oil components, dust, etc. adhering to the surface.

As described above, the molding system formed by molding the liquid crystalline resin composition is particularly large on the surface, and the molecular alignment of the polymer is particularly large. Therefore, it is easy to peel off the surface of the molded body. Therefore, ultrasonic cleaning is performed on the molded body At this time, the so-called surface peeling and the fluffing phenomenon of feathers rising, and the fluffing portion of the feathers rising cause the occurrence of minute garbage.

Therefore, in the state where the liquid crystal resin composition is used as a raw material for parts for camera modules, even if ultrasonic cleaning is performed on the molded body, a special liquid crystal resin composition without fluffing on the surface of the molded body is used . As a special liquid crystal resin composition, a liquid crystal resin composition for a camera module including a liquid crystal resin and specific talc and carbon black is disclosed (refer to Patent Document 1).

【Prior Technical Literature】 【Patent Literature】

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

However, in the review of the present inventors, in the liquid crystal resin composition for camera modules described in Patent Document 1, the fluff suppression of the surface of the molded body is insufficient, and the surface used for manufacturing the molded body is required to be less likely to be fluffed. Liquid crystal resin composition for camera modules.

In addition, if the review by the present inventors is conducted, the deformation of bending becomes large when the conventional liquid crystal resin composition for a camera module is formed to produce a molded body such as a lens holder, etc. During the assembly, an accident occurred.

In addition, in recent years, mobile phones equipped with camera modules and equipped with the same functions as non-contact IC cards are becoming popular. This type of mobile phone is attached to a non-contact reader when reading and writing information. this At the time, because the aforementioned mobile phone hit the non-contact reader with a strong force, it is required that the camera module used in the manufacturing of the aforementioned mobile phone is not prone to accidents and is formed to improve the mechanical strength. Liquid crystal resin composition for camera modules.

In addition, from the viewpoint of not easily occurring during the processing and use of the camera module, a liquid crystal resin composition for a camera module for manufacturing a molded body having good heat resistance is required.

In addition, when the liquid crystal resin composition for camera modules is viewed from the viewpoint of moldability, it is required to improve the fluidity at the time of melting.

The present invention has been accomplished to solve the aforementioned problems; its object is to provide a liquid crystal resin composition for a camera module, which is used to produce a surface that is less prone to fluffing and suppress deformation of bending , Improve the mechanical strength and good heat resistance of the camera module parts, and improve the fluidity during melting.

In order to solve the aforementioned problems, the present inventors have intensively and repeatedly studied. As a result, it was found that the aforementioned problem can be solved by using a liquid crystal resin composition for a camera module containing a liquid crystal resin, fibrous wollastonite, an epoxy-containing copolymer and a plate-like filler in a specific ratio , So as to complete the present invention. More specifically, the present invention provides the following.

(1): A liquid crystal resin composition for a camera module, containing (A) liquid crystal resin, (B) fibrous wollastonite, (C) epoxy group-containing copolymer, and (D) plate-like filler , (A) component content is 55~95.5% by mass, (B) component content is 2.5~25% by mass, (C) component The content is 1.0 to 4.5% by mass, the content of component (D) is 10 to 35% by mass, and the total content of components (B) and (D) is 20 to 37.5% by mass.

(2): The liquid crystal resin composition for a camera module as described in (1), the aforementioned (C) epoxy group-containing copolymer consists of (C1) epoxy group-containing olefin copolymer and (C2) At least one selected from the group consisting of epoxy styrene copolymers.

(3): A camera module component composed of the liquid crystal resin composition for a camera module as described in (1) or (2).

(4): A camera module including the camera module parts as described in (3).

The liquid crystal resin composition for a camera module of the present invention improves the fluidity at the time of melting. If the composition is used as a raw material for manufacturing a camera module part, the surface is less prone to fluff, and the deformation of bending is suppressed. 2. Parts for camera modules with improved mechanical strength and good heat resistance.

1‧‧‧Camera module

10‧‧‧ substrate

11‧‧‧Optical components

12‧‧‧Lead wiring

13‧‧‧Lens holder

14‧‧‧Roller

15‧‧‧Lens

16‧‧‧IR filter

17‧‧‧Guide

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

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

<Liquid crystal resin composition for camera module>

The liquid crystal resin composition for camera modules of the present invention contains (A) liquid Crystalline resin, (B) fibrous wollastonite, (C) epoxy-containing copolymer and (D) plate filler.

[(A) Liquid crystalline resin]

The so-called (A) liquid crystal resin used in the present invention refers to a melt-processable polymer having the property of forming an optically anisotropic melt phase. The properties of the anisotropic molten phase can be confirmed by the conventional polarization inspection method using orthogonal polarizers. More specifically, the confirmation of the anisotropic molten phase can be carried out by using a Leitz polarizing microscope to observe the molten sample mounted on the Leitz hot pedestal at a magnification of 40 times under a nitrogen atmosphere to implement the anisotropic molten phase Of confirmation. When the liquid crystalline polymer applicable to the present invention is inspected between orthogonal polarizers, even if it is in a melt-static state, it usually transmits polarized light and exhibits optical anisotropy.

The type of (A) liquid crystalline resin is not particularly limited, but aromatic polyester and/or aromatic polyester amide are preferred. In addition, polyester systems that partially contain aromatic polyester and/or aromatic polyester amide in the same molecular chain are also within this range. When the (A) liquid crystalline resin is dissolved in pentafluorophenol at a concentration of 0.1% by mass at 60°C, it is preferable to use a logarithm of at least about 2.0 dl/g, more preferably 2.0 to 10.0 dl/g. Viscosity (IV).

As the aromatic polyester or aromatic polyester amide series which can be applied to the (A) liquid crystalline resin of the present invention, it is particularly preferable to have a compound derived from aromatic hydroxycarboxylic acid, aromatic hydroxyamine and aromatic diamine. A group consisting of aromatic polyester or aromatic polyester amide as a constituent component of at least one type of repeating unit of the selected compound.

More specifically, (1) polyesters mainly composed of one or more types of repeating units derived from aromatic hydroxycarboxylic acids and their derivatives; (2) mainly composed of (a) derived from aromatic hydroxycarboxylic acids One or more types of repeating units of acids and their derivatives, (b) One or more types of repeating units derived from aromatic dicarboxylic acids, alicyclic dicarboxylic acids, and derivatives of these, and (c) Polyesters composed of at least one or more than two repeating units of aromatic diols, alicyclic diols, aliphatic diols and derivatives of these; (3) Mainly composed of (a) One or more types of repeating units derived from aromatic hydroxycarboxylic acids and their derivatives, (b) One or more types of repeating derived from aromatic hydroxyamines, aromatic diamines and these derivatives Units, and (c) polyesteramides composed of one or more repeating units of aromatic dicarboxylic acids, alicyclic dicarboxylic acids, and derivatives of these; (4) Mainly composed of (a ) One or more repeating units derived from aromatic hydroxycarboxylic acids and their derivatives, (b) One or more types derived from aromatic hydroxyamines, aromatic diamines and these derivatives Repeating units, (c) one or more repeating units derived from aromatic dicarboxylic acids, alicyclic dicarboxylic acids, and derivatives thereof, and (d) from aromatic diols, alicyclics Polyesteramides composed of at least one or two or more repeating units of diols, aliphatic diols and derivatives of these. In addition, a molecular weight modifier may be used in combination with the aforementioned structural components as needed.

As a preferred example of a specific compound constituting the (A) liquid crystalline resin applicable to the present invention, aromatic hydroxycarboxylic acids such as p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, and 2,6-bis Hydroxynaphthalene, 1,4-dihydroxynaphthalene, 4,4'-dihydroxybiphenyl, hydroquinone, resorcinol, compounds represented by the following general formula (I), and by the following general Formula (Ⅱ) expressed Aromatic diols such as compounds; terephthalic acid, isophthalic acid, 4,4'-diphenyl dicarboxylic acid, 2,6-naphthalene dicarboxylic acid, and by the following general formula (III) Aromatic dicarboxylic acids such as represented compounds; aromatic amines such as p-aminophenol and p-phenylenediamine.

(X: a group selected from an alkylene group (C ₁ to C ₄ ), allyl group, -O-, -SO-, -SO ₂ -, -S-, and -CO-.)

(Y: Base selected by -(CH ₂ ) _n -(n=1~4) and -O(CH ₂ ) _n O-(n=1~4).)

The preparation of the (A) liquid crystalline resin used in the present invention can be prepared from the aforementioned monomer compound (or a mixture of monomers) using a direct polymerization method or a transesterification method by a conventional method, and is generally used Melt polymerization method or slurry polymerization method. The aforementioned compounds having ester-forming ability can still be directly used for polymerization in its original form, and it can also be denatured from a precursor into a derivative having the ester-forming ability in the stage before polymerization. At the time of these polymerizations, various catalysts can be used, and the representative series include dialkyl tin oxide, diaryl tin oxide, titanium dioxide, alkoxy titanium silicates, titanium alkoxides, carboxyl Acid bases and alkaline earth metal salts, such as Lewis acid salts of BF ₃ and the like. The amount of catalyst used is generally about 0.001 to 1% by mass relative to the total mass of the monomer, and particularly preferably about 0.01 to 0.2% by mass. The polymers produced by these polymerization methods can be increased in molecular weight by solid-phase polymerization heated under reduced pressure or in an inert gas if necessary.

The melt viscosity of the liquid crystal resin (A) obtained by the aforementioned method is not particularly limited. Generally, those whose melt viscosity at the molding temperature is 10 MPa or more and 600 MPa or less at a shear rate of 1000 sec ^-1 can be used. However, if the viscosity of oneself is too high, the liquidity is very deteriorated, so it becomes undesirable. In addition, the aforementioned (A) liquid crystal resin may be a mixture of two or more liquid crystal resins.

In the liquid crystal resin composition for camera modules of the present invention, (A) the content of the liquid crystal resin is 55 to 95.5% by mass. If the content of the component (A) is 55% by mass or more, it is desirable because of the so-called fluidity and the suppression of fluff on the surface of the molded body. If the content of the component (A) is 95.5% by mass or less , It is ideal because of the so-called heat resistance. In addition, the ideal content of the component (A) is 60 to 80% by mass, and the more ideal content of the component (A) is 62 to 70% by mass.

[(B) fibrous wollastonite]

In this specification, (B) fibrous wollastonite refers to wollastonite having a depth-to-width ratio, that is, an average fiber length/average fiber diameter value of 8 or more. by From the standpoint of the effect of suppressing fluff on the surface of the molded body, the depth-to-width ratio is preferably 10 to 25, and more preferably 15 to 20. In addition, in this specification, wollastonite with a depth to width ratio less than 8 is called granular wollastonite.

(B) The fibrous wollastonite series is not particularly limited, and for example, conventional fibrous wollastonite can be used. (B) The fibrous wollastonite system may be used alone or in combination of two or more different aspect ratios, average fiber lengths, average fiber diameters, and the like.

(B) The average fiber diameter of the fibrous wollastonite is preferably 3.0-50 μm, and the more ideal average fiber diameter is 4.5-40 μm. When the aforementioned average fiber diameter is 3.0 μm or more, it is easy to ensure the necessary mechanical strength and load bending temperature as a camera module. When the aforementioned average fiber diameter is 50 μm or less, it is easy to increase the fluff suppression effect on the surface of the molded body. In addition, in this specification, as the average fiber diameter, a value measured by a CCD camera to put a solid microscope image on a PC, an image measuring machine, and an image processing method is used.

(B) The average fiber length of the fibrous wollastonite is preferably 30 to 800 μm, and the more ideal average fiber length is 50 to 600 μm. When the aforementioned average fiber length is 30 μm or more, it is easy to ensure the necessary mechanical strength and load bending temperature as a camera module. When the aforementioned average fiber length is 800 μm or less, it is easy to increase the fluff suppression effect on the surface of the molded body. In addition, in this specification, as the average fiber length, a value measured by an image measuring machine and an image processing method is used to put a solid microscope image into a PC by a CCD camera.

(B) The content of the component is the liquid used in the camera module of the present invention The crystalline composition becomes 2.5 to 25% by mass. When the content of (B) component is 2.5% by mass or more, it is easy to ensure the necessary mechanical strength and load bending temperature as a camera module. When the content of the component (B) is 25% by mass or less, it is easy to improve the fluidity when the composition is melted, it is easy to improve the fluff suppression effect on the surface of the molded body, and it is easy to improve the bending deformation suppression effect on the molded body. More ideally, the aforementioned content is 5-20% by mass.

[(C) Epoxy group-containing copolymer]

(C) The epoxy group-containing copolymer system may be used alone or in combination of two or more. The (C) epoxy group-containing copolymer system is not particularly limited. For example, the group consisting of (C1) epoxy group-containing olefin copolymer and (C2) epoxy group-containing styrene copolymer is selected. At least one of them. (C) The component is incorporated in the liquid crystal resin composition for camera modules. When ultrasonic cleaning is performed on the molded body formed by molding the composition, it helps to suppress fluff on the surface of the molded body.

There is no clear reason for suppressing fluff, but it is considered that the surface state of the molded body is changed by blending a certain amount, and this change contributes to the suppression of fluff.

Examples of the (C1) epoxy group-containing olefin copolymer series include copolymers composed of a repeating unit derived from α-olefin and a repeating unit derived from glycidyl ester of α,β-unsaturated acid.

The α-olefin system is not particularly limited, and examples thereof include ethylene, propylene, and butene. Even among them, ethylene is preferably used. The glycidyl ester of α,β-unsaturated acid is represented by the following general formula (IV). Epoxypropyl esters of α,β-unsaturated acids such as glycidyl acrylate, methacrylic acid ring Oxypropyl, glycidyl ethacrylate, glycidyl itaconate, etc., particularly preferably glycidyl methacrylate.

In the (C1) epoxy group-containing olefin copolymer, it is preferable that the content of the repeating unit derived from α-olefin is 87 to 98% by mass, and that derived from the epoxypropyl ester of α,β-unsaturated acid The content of repeating units is 13 to 2% by mass.

The (C1) epoxy group-containing olefin copolymer used in the present invention may contain 0 to 48 relative to 100 parts by mass of the aforementioned two components, in addition to the aforementioned two components, within the scope not impairing the present invention The mass part is derived from one or more than two recurring units of olefinic unsaturated esters such as acrylonitrile, acrylate, methacrylate, α-methylstyrene, maleic anhydride, etc. as the third component .

The epoxy group-containing olefin-based copolymer used as the component (C1) of the present invention can be easily prepared by a general radical polymerization method using monomers and radical polymerization catalysts corresponding to the respective components. More specifically, it is usually possible to copolymerize α-olefins with 500-4000 atm, 100-300°C in the presence or absence of a suitable solvent and chain-shifting agent in the presence of a free radical generator The method is to produce the glycidyl ester of α,β-unsaturated acid. In addition, it can also be produced by mixing the α-olefin with the glycidyl ester of α,β-unsaturated acid and the free radical generator in the extruder by melt graft copolymerization.

Examples of the epoxy-containing styrene-based copolymer series of (C2) include copolymers composed of repeating units derived from styrenes and repeating units derived from glycidyl esters of α,β-unsaturated acids . The glycidyl ester of α,β-unsaturated acid is the same as the description of the component (C1), so the description is omitted.

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

The (C2) epoxy group-containing styrene copolymer used in the present invention may be, in addition to the aforementioned two components, one or more recurring units derived from other vinyl monomers as the third Multicomponent copolymer of ingredients. Suitable as the third component is a repeating unit derived from one or more types of olefinic unsaturated esters such as acrylonitrile, acrylate, methacrylate, maleic anhydride, and the like. The epoxy group-containing styrene-based copolymer containing 40% by mass or less of these repeating units in the copolymer is suitable as the component (C2).

In the (C2) epoxy-containing styrene-based copolymer, the content of the repeating unit derived from the glycidyl ester of α,β-unsaturated acid is preferably 2 to 20% by mass, derived from styrenes The content of the repeating unit is 80 to 98% by mass.

(C2) The epoxy group-containing styrene-based copolymer system can be prepared by a general radical polymerization method using monomers and radical polymerization catalysts corresponding to each component. More specifically, it is generally possible to copolymerize styrenes and styrenes in the presence of free radical generators, 500 to 4000 atmospheres, 100 to 300°C, in the presence or absence of appropriate solvents and chain-shifting agents. The method is to produce the glycidyl ester of α,β-unsaturated acid. In addition, it can also be produced by mixing styrenes and epoxypropyl esters of α,β-unsaturated acids and free radicals. The raw material is produced by melt graft copolymerization in an extruder.

In addition, in terms of heat resistance, the (C) epoxy group-containing copolymer system is preferably (C1) epoxy group-containing olefin copolymer. In a state where the (C1) component and (C2) component are used together, the ratio between these components can be appropriately selected according to the required characteristics.

(C) The content of the epoxy group-containing copolymer is 1.0 to 4.5% by mass in the resin composition for camera modules of the present invention. (C) The content of the component of 1.0% by mass or more is necessary to suppress fluffing on the surface of the molded body, and 4.5% by mass or less is a reason why a good molded body is obtained without impairing fluidity. More ideally, the aforementioned content is 2.0 to 4.0% by mass.

[(D) Plate filler]

(D) The plate-like filler system preferably has an average particle diameter of 20 to 50 μm. When the aforementioned average particle diameter is 20 μm or more, the necessary mechanical strength and load bending temperature of the camera module are easily ensured, and the bending deformation suppression effect of the molded body is easily improved. When the aforementioned average particle diameter is 50 μm or less, it is easy to increase the fluff suppression effect on the surface of the molded body. Ideally, the aforementioned average particle size is 23 to 30 μm. In addition, in this specification, the average particle diameter is the value measured by the laser diffraction/scattering particle size distribution measurement method.

The (D) plate-like filler is not particularly limited, and examples thereof include mica, talc, glass flakes, graphite, and various metal foils (for example, aluminum foil, iron foil, and copper foil). Two or more types can be used as the component system (D). In the present invention, mica and talc are preferably used as the component (D), and mica is more preferably used.

(D) The content of the component is the liquid used in the camera module of the present invention The crystalline composition becomes 10 to 35% by mass. When the content of the component (D) is 10% by mass or more, the necessary mechanical strength and load bending temperature of the camera module are easily ensured, and the bending deformation suppression effect of the molded body is easily improved. When the content of the component (D) is 35% by mass or less, it is easy to increase the fluff suppression effect on the surface of the molded body. Ideally, the aforementioned content is 15 to 30% by mass.

In addition, the total content of the component (B) and the component (D) is 20 to 37.5% by mass, preferably 25 to 35% by mass in the liquid crystal composition for camera modules of the present invention. When the aforementioned total content is 20% by mass or more, the necessary mechanical strength and load bending temperature of the camera module can be easily ensured. When the aforementioned total content is 37.5% by mass or less, it is easy to improve the fluidity when the composition is melted, it is easy to improve the fluff suppression effect on the surface of the molded body, and it is easy to improve the impact resistance of the molded body.

[(E)Carbon black]

In the present invention, the carbon black (E) used as an optional component is not particularly limited if it is generally used for coloring of resins and is available. Generally, (E) carbon black contains agglomerates formed by agglomeration of primary particles, as long as it does not significantly contain a large number of agglomerates with a size of 50 μm or more, it is formed by molding the resin composition of the present invention On the surface of the body, it is not easy to produce a lot of protruding particles (fine protruding granular protrusions (fine irregularities) that aggregate carbon black). When the content rate of the particles having a particle size of 50 μm or more in the foregoing block is 20 ppm or less, it is easy to improve the fluff suppression effect on the surface of the molded body. The ideal content rate is 5 ppm or less.

As the (E) carbon black blending amount, the liquid crystal resin composition for camera modules is preferably in the range of 0.5 to 5% by mass. In carbon black training When the total amount is 0.5% by mass or more, it is not easy to reduce the blackness of the obtained resin composition, and it is not easy to cause anxiety in light-shielding properties. When the blending amount of carbon black is 5 mass% or less, it is not easy to become uneconomical, and protruding particles are not easily generated.

[Other ingredients]

The liquid crystal resin composition for a camera module of the present invention can be appropriately added with other polymers, other fillers, and generally added to synthetic resin in accordance with the required performance without compromising the effects of the present invention. Known substances, that is, stabilizers such as oxidation inhibitors and ultraviolet absorbers, antistatic agents, flame retardants, dyes and pigments, colorants, lubricants, mold release agents, crystallization accelerators, crystallization nucleating agents Wait.

The other fillers refer to (B) fibrous wollastonite, (D) plate-like filler and (E) fillers other than carbon black, and examples include wollastonite with a depth-to-width ratio of less than 8 ( B) Wollastonite other than fibrous wollastonite; glass fiber, etc. (B) fibrous filler other than fibrous wollastonite; granular filler such as silica.

, [Preparation of liquid crystal resin composition for camera module]

The preparation of the resin composition for camera modules of the present invention is not particularly limited. For example, by mixing the aforementioned components (A), (B), (C), and (D), a 1-axis or 2-axis extruder is used, and these are subjected to melt-kneading treatment to perform liquid crystallinity for camera modules Preparation of resin composition.

[Liquid crystal resin composition for camera module]

The shape of the (B) component in the liquid crystal resin composition for camera modules of the present invention is different from the shape of the (B) component before blending. The shape of the aforementioned component (B) is the shape before the blending. If it’s the shape before the training, as described above If you do, you will get parts for camera modules that are not prone to fluff on the surface.

Similarly, the shape of the (D) component in the liquid crystal resin composition for camera modules of the present invention is different from the shape of the (D) component before blending. The shape of the aforementioned (D) component is the shape before combining. If the shape before fitting is as described above, parts for the camera module that suppress the deformation of bending are obtained.

The liquid crystal resin composition for camera modules of the present invention obtained as described above preferably has a melt viscosity of less than 50 Pa˙sec. It is also a characteristic of the liquid crystal resin composition for camera modules of this invention that the flowability at the time of melting is improved and it has good moldability. In this specification, as the melt viscosity, it is obtained by a measurement method according to ISO 11443 under conditions of a cylinder temperature 10 to 20°C higher than the melting point of the liquid crystalline resin and a shear rate of 1000 sec ^-1 . Value.

The liquid crystal resin composition for a camera module of the present invention preferably has a load bending temperature of 240°C or higher. The aspect having good heat resistance is also a feature of the liquid crystal resin composition for camera modules of the present invention. In addition, the load bending temperature is a value measured by a method according to ISO 75-1,2.

<Camera module parts and camera module>

Using the aforementioned liquid crystal resin composition for camera modules, parts for camera modules are manufactured. If the resin composition of the present invention is used as a raw material, the surface of the camera module parts is not likely to fluff. The parts for camera modules are subjected to ultrasonic cleaning. Therefore, it is required that even if ultrasonic cleaning is performed, the surface is not easily fluffed. If the resin composition of the present invention is used, Even if the ultrasonic cleaning of the camera module parts is carried out under more enhanced conditions, there will be no falling-outs that cause garbage, etc., or almost no generation. Therefore, after the camera module parts are assembled into the finished product, the garbage generated due to the surface of the camera module parts being fluffed has almost no effect on the quality of the finished product.

The parts for camera modules formed by molding the liquid crystal resin composition for camera modules of the present invention will be described. In Fig. 1, a cross section of a general camera module is shown schematically. As shown in FIG. 1, the camera module 1 includes: a substrate 10, optical elements 11, lead wires 12, a lens holder 13, a roller 14, a lens 15, an IR filter 16 and a guide 17.

The optical element 11 is arranged on the substrate 10, and is electrically connected by the lead wire 12 between the optical element 11 and the substrate 10.

The guide 17 is arranged on the substrate 10, the lens holder 13 is arranged on the guide 17, and the guide 17 and the lens holder 13 cover the optical element 11. The lens holder 13 is formed at the top to form an opening, and a spiral groove is formed on the wall surface of the opening.

The drum 14 is cylindrical, and holds the lens 15 roughly horizontally inside the cylinder. In addition, a spiral convex portion is formed on the side wall of one end of the cylinder. By screwing the spiral convex portion and the spiral groove formed on the opening wall surface of the lens holder 13, the drum 14 is made联接于镜座架13。 Connected to the lens holder 13. In addition, the IR filter 16 is disposed at one end of the drum 14 and hermetically seals one end of the cylindrical drum 14. As shown in FIG. 1, the IR filter 16 and the lens 15 are arranged roughly in parallel.

In the camera module 1 shown in FIG. 1, the lens holder 13 is The effect of the magnetic force generated by the coil (not shown) wound on the lens holder 13 and the permanent magnet (not shown) arranged around the coil is changed up and down on the guide 17 to change the lens 15 The distance from the optical element 11. The focal length of the camera can be adjusted by adjusting the distance.

The lens module 13 and/or the roller 14 used as a camera module component can be manufactured from the aforementioned camera module 1 using the liquid crystal resin composition for a camera module of the present invention as a raw material. The general liquid crystal resin composition is not suitable as a raw material for manufacturing these parts. When the lens holder 13 and/or the roller 14 are manufactured using a general liquid crystal resin composition as a raw material, the following problems occur.

On the surface part of the molding system formed by molding a general liquid crystal resin composition, the molecular alignment of the polymer is particularly large. Therefore, the surface of the molded body is prone to fluff, and this fluff is the cause of the generation of minute garbage. When the tiny garbage is attached to the lens 15 or the like, the performance of the camera module is reduced.

The components of the camera module such as the lens holder 13 and the roller 14 are for the purpose of removing dust and minute trash on the surface. Therefore, before assembling the camera module 1, ultrasonic cleaning is performed. However, the surface of a molded body formed by molding a general liquid crystalline resin composition tends to fluff, and therefore, when ultrasonic cleaning is carried out, the surface is feathered. Since such a problem occurs, generally, a molded body formed by molding a liquid crystalline resin composition cannot be subjected to ultrasonic cleaning.

The aforementioned focal length adjustment is the lens holder 13 by the action of the magnetic force generated by the coil (not shown) wound around the lens holder 13 and the permanent magnet (not shown) arranged around the coil to Up and down above the guide 17, And adjust the focal length. At this time, as described above, the molding system formed by molding a general liquid crystalline resin composition tends to fluff on the surface, and therefore, the surface is likely to be peeled off to cause peeling. The possibility that the peeled substance becomes minute garbage and adheres to the lens 15 or the like to degrade the performance of the camera module is increased.

As mentioned above, when the liquid crystal resin composition is generally used as the raw material of the lens holder 13 and/or the roller 14, accidents are likely to occur. However, the liquid crystal resin composition for camera modules of the present invention becomes a molded body At this time, even if the molded body is subjected to ultrasonic cleaning, there is almost no problem of the occurrence of fluff, and the surface state of the molded body is improved, so it can be suitably used as the lens holder 13 and/or the roller 14 raw material.

In the state where the liquid crystal resin composition for a camera module of the present invention is used in the lens holder 13, as the material series of the guide 17, other than the liquid crystal resin composition for a camera module of the present invention, specifically exemplified Nylon, etc.

【Example】

In the following, examples are given to explain the present invention in more detail. However, the present invention is not limited to these examples.

<Liquid crystal resin>

˙Liquid crystal polyester amide resin

After the following materials were charged in the polymerization vessel, the temperature of the reaction system was raised to 140°C, and the reaction was carried out at 140°C for 1 hour. Then, after 4.5 hours, the temperature was raised to 340°C. From this, the pressure was reduced to 10 Torr (that is, 1330 Pa) after 15 minutes, and acetic acid, excess acetic anhydride, and other low-boiling components were distilled off. Melt polymerization. The torque during stirring reaches the specified value After the value, nitrogen was introduced, and the pressure was reduced from normal pressure to normal pressure. The polymer was discharged from the lower part of the polymerization vessel, and the wire was pelletized to obtain pellets. The obtained particles were subjected to a heat treatment at 300°C for 2 hours under a nitrogen flow to obtain the intended polymer. The melting point of the obtained polymer was 334°C, and the melt viscosity was 14.0 Pa˙s. In addition, the melt viscosity of the aforementioned polymer is measured in the same manner as the melt viscosity measurement method described later.

(I) 4-hydroxybenzoic acid; 188.4g (60 mol%)

(Ⅱ) 2-hydroxy-6-naphthoic acid; 21.4g (5 mol%)

(Ⅲ) Terephthalic acid; 66.8g (17.7 mol%)

(Ⅳ) 4,4'-dihydroxybiphenyl; 52.2g (12.3 mol%)

(V) 4-acetamidophenol; 17.2g (5 mol%)

Metal catalyst (potassium acetate catalyst); 15mg

Acetylating agent (acetic anhydride); 226.2g

<Materials other than liquid crystal resins>

˙ Fibrous wollastonite: NYGLOS 8 (manufactured by NYCO Materials, depth-to-width ratio 17, average fiber length 136 μm, average fiber diameter 8 μm)

˙ Granular wollastonite: NYAD 325 (manufactured by NYCO Materials, depth to width ratio 5, average fiber length 50 μm, average fiber diameter 5 μm)

˙Glass fiber: PF70E-001 (made by Nitto Textile Co., Ltd., mild fiber, average fiber diameter 10 μm, average fiber length 70 μm)

˙Epoxy-containing olefin copolymer: BONDFAST 2C (Sumitomo Chemical Co., Ltd., ethylene-glycidyl methacrylate copolymer, glycidyl methacrylate content 6% by mass)

˙No copolymer containing epoxy group: Tuftec M1913 (manufactured by Asahi Kasei Co., Ltd., maleic anhydride modified hydrogenated styrene-ethylene-butadiene-styrene block copolymer)

˙Plate filler 1: AB-25S (made by Yamaguchi Mica Industry Co., Ltd., mica, average particle size 24 μm)

˙Plate filler 2: Crowntalc PP (Matsumura Industries Co., Ltd., talc, average particle diameter 12.8 μm, average depth to width ratio 6)

˙Carbon black: VULCAN XC305 (manufactured by Japan Cabot Co., Ltd., with an average particle diameter of 20 nm and a particle ratio of 50 μm or more in diameter is 20 ppm or less)

<Manufacture of liquid crystal resin composition for camera module>

Using a biaxial extruder (manufactured by Nippon Steel Works Co., Ltd., TEX 30 α type) at the ratio shown in Table 1 or Table 2, at a cylinder temperature of 350° C., the above components were melt-kneaded to obtain Particles of liquid crystal resin composition for camera module.

<melt viscosity>

Using the aforementioned particles, the melt viscosity of the liquid crystal resin composition for camera modules of Examples and Comparative Examples was measured. Specifically, the appearance of the melt under the conditions of a cylinder temperature of 350° C. and a shear rate of 1000 sec ^-1 was measured in accordance with ISO 11443 using a capillary galvanometer (manufactured by Toyo Seiki, Capillography 1D: piston diameter 10 mm) Viscosity. In the measurement, a mesh with an inner diameter of 1 mm and a length of 20 mm was used. The results are shown in Table 1 and Table 2.

<Load bending temperature>

Using a molding machine (Sumitomo Heavy Industries, Ltd., "SE100DU"), the pellets of the examples and comparative examples were molded under the following molding conditions to obtain measurements Use test pieces (4mm × 10mm × 80mm). Using this test piece, the load bending temperature was measured by the method according to ISO 75-1,2. In addition, 1.8 MPa was used as the bending stress system. The results are shown in Table 1 and Table 2.

[Forming conditions]

Cylinder temperature: 350℃

Mold temperature: 80℃

Back pressure: 2.0MPa

Injection speed: 33mm/sec

<Bending test>

Using a molding machine (Sumitomo Heavy Industries, Ltd., "SE100DU"), the pellets of Examples and Comparative Examples were molded under the following molding conditions to produce a bending test piece of 130 mm×13 mm×0.8 mm. Using this test piece, the bending strength, bending elastic modulus, and breaking distortion were measured in accordance with ASTM D790. The results are shown in Table 1 and Table 2.

[Forming conditions]

Cylinder temperature: 350℃

Mold temperature: 90℃

Injection speed: 33mm/sec

Packing pressure: 50MPa

<Xiao's Impact Test>

Using a molding machine (Sumitomo Heavy Industries, Ltd., "SE100DU"), the pellets of the examples and comparative examples were molded under the following molding conditions to become test pieces for measurement (4 mm×10 mm×80 mm). Using this test piece, the Shore impact strength was measured by the method according to ISO 179-1. The results are shown in Table 1 and Table 2.

[Forming conditions]

Cylinder temperature: 350℃

Mold temperature: 80℃

Back pressure: 2.0MPa

Injection speed: 33mm/sec

<flatness>

Using a molding machine (Sumitomo Heavy Industries, Ltd., "SE100DU"), the pellets of the examples and comparative examples were molded under the following molding conditions to produce 5 pieces of 80 mm×80 mm×1 mm flat test pieces. Place the first flat-shaped test piece on a horizontal surface, and use a CNC image measuring machine (model: QVBHU 404-PRO1F) manufactured by Mitutoyo Co., Ltd. to measure the 9 parts on the flat-shaped test piece. The height at the beginning of the aforementioned horizontal plane is calculated from the obtained measured value to calculate the average height. The position for measuring the height is on the main plane of the flat-shaped test piece, so that the distance from each side of the main plane becomes 3 mm, and when a 74 mm square is placed on a certain side, it becomes the vertices of the square. The position of the intersection point between the midpoint of each side of the square and the two diagonals of the square. The height from the aforementioned horizontal plane is the same as the aforementioned average height, and the plane parallel to the aforementioned horizontal plane is used as the reference plane. By measuring the heights of the aforementioned nine parts, the maximum height and the minimum height from the reference plane are selected, and the difference between the two is calculated. Similarly, even for the other four flat-shaped test pieces, the aforementioned difference is calculated, and the five values obtained on average are the flatness values. The results are shown in Table 1 and Table 2.

[Forming conditions]

Cylinder temperature: 350℃

Mold temperature: 80℃

Injection speed: 33mm/sec

Packing pressure: 60MPa

<number of dust generation>

Using a molding machine (Sumitomo Heavy Industries, Ltd., "SE30DUZ"), the pellets of Examples and Comparative Examples were molded under the following molding conditions to obtain a molded body of 12.5 mm×120 mm×0.8 mm. This molded body was used as a test piece.

[Forming conditions]

Cylinder temperature: 350℃

Mold temperature: 90℃

Injection speed: 80mm/sec

[Evaluation]

In 3 minutes at room temperature water, the aforementioned test piece was mounted on an ultrasonic washing machine (output 300W, frequency 45kHz). Then, the particle count (the particle counter in liquid KL-11A (PARTICLECOUNTER) manufactured by RION Co., Ltd.) was used to measure the number of particles of 2 μm or more existing in the water, and the number of dust generation was evaluated. The results are shown in Table 1 and Table 2.

The results described in Tables 1 and 2 clearly show that the molding system manufactured using the particles of the examples confirmed that even if ultrasonic cleaning is performed, the number of dusts generated is reduced. In addition, the numerical value of the aforementioned flatness of the forming system becomes smaller. From these results, it can be said that the molding system formed by molding the particles of the examples has a significantly different surface state than the molded body formed by molding the usual liquid crystalline resin composition particles of the comparative examples, etc. Deformed.

In addition, the molding system manufactured using the particles of the examples was confirmed to have good heat resistance.

In addition, the molding system manufactured using the particles of the examples was confirmed to increase mechanical strength such as bending strength, impact resistance and the like. Therefore, the mechanical strength can be improved by shaping the particles of the embodiment, specifically, for example, it is possible to manufacture accidents that are not easily broken due to impact or driving impact when impacted on a non-contact reader or the like Parts for camera modules.

In addition, the particles of the examples were confirmed to have improved flowability at the time of melting and had good formability.

1‧‧‧Camera module

10‧‧‧ substrate

11‧‧‧Optical components

12‧‧‧Lead wiring

13‧‧‧Lens holder

14‧‧‧Roller

15‧‧‧Lens

16‧‧‧IR filter

17‧‧‧Guide

Claims (4)

A liquid crystal resin composition for camera modules, characterized by containing (A) liquid crystal resin, (B) fibrous wollastonite, (C) epoxy group-containing copolymer and (D) plate-like filler, (A) The content of the component is 62 to 70% by mass, (B) The content of the component is 2.5 to 25% by mass, (C) The content of the component is 1.0 to 4.5% by mass, (D) The content of the component is 10 to 30% by mass, the total content of the components (B) and (D) is 20 to 35% by mass, the average fiber diameter of the (B) component is 3.0 to 50 μm, and the average fiber length of the (B) component is 30 to 800 μm, and the average particle diameter of the component (D) is 20 to 50 μm. For example, the liquid crystal resin composition for a camera module according to item 1 of the patent application, wherein the aforementioned (C) epoxy-containing copolymer is composed of (C1) epoxy-containing olefin copolymer and (C2) ring-containing At least one selected from the group consisting of oxystyrene copolymers. A component for a camera module, characterized by being composed of a liquid crystal resin composition for a camera module as described in item 1 or 2 of the scope of patent application. A camera module is characterized by including the camera module parts as described in item 3 of the patent application scope.

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