TW201434903A - Liquid crystal resin composition for camera module and camera module using same - Google Patents

Abstract

Provided is a liquid crystal resin composition for a camera module that is to be used for producing a camera module component the surface of which is neither easily raised nor easily charged. The resin composition comprises a liquid crystal resin (A), at least one kind of a non-conductive filler (B) selected from a fibrous nonconductive filler (B1) and a non-fibrous non-conductive filler (B2), at least one kind of a copolymer (C) selected from an olefin-based copolymer (C1) and a styrene-based copolymer (C2), and conductive fillers (D) comprising a fibrous conductive filler (D1) and a non-fibrous conductive filler (D2), each in a definite amount, wherein the components (B1), (B2), (C1), (C2), (D1) and (D2) are respectively configured from specific components and the volume resistivity is 1104-11014 Ω cm.

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 has excellent mechanical strength, heat resistance, chemical resistance, electrical properties, etc., and has good dimensional stability. Therefore, it is widely used as a high-performance engineering. plastic. Recently, the liquid crystalline resin has been used for precision mechanical parts by exerting these advantages.

In the state of precision machinery, especially optical machinery with lenses, some garbage, dust, etc. have an effect on mechanical properties. For example, in optical components used in camera modules, the optical characteristics of the camera module are significantly reduced when tiny trash, oil components, and dust adhere to the lens. In order to prevent the reduction of such optical characteristics, in general, the components constituting the camera module (hereinafter referred to as "the components for the camera module" are generated.) Ultrasonic washing is performed before assembly. Clean, remove tiny trash, oil components, dust, etc. attached to the surface.

As described above, since the molecular alignment of the molding system polymer formed by molding the liquid crystalline resin composition is particularly larger than the surface portion, the surface of the molded body is easily peeled off, so that ultrasonic cleaning is performed on the molded body. When it is clean, the surface is peeled off and the phenomenon of so-called feather erection occurs, and the raised portion of the feather is caused by the occurrence of minute garbage.

Therefore, in the state in which the liquid crystal resin composition is used as a raw material of the camera module component, a liquid crystal resin composition which does not fluff the surface of the molded body even if the ultrasonic cleaning of the molded body is performed is used. . A liquid crystal resin composition for a camera module including a liquid crystalline resin, a specific talc, and carbon black is disclosed as a special liquid crystal resin composition (refer to Patent Document 1).

[Previous Technical Literature] [Patent Literature]

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

However, in the liquid crystal resin composition for a camera module described in Patent Document 1, the squeezing of the surface of the molded body is insufficient, and it is further required that the surface of the molded body is not easily raised. A liquid crystal resin composition for a camera module of a molded body.

However, in the camera module, the lens mount is moved up and down to the guide of the pedestal of the lens mount by the magnetic force generated by the coil wound around the lens mount and the permanent magnet disposed around the coil. Above, to align the focus of the lens. Here, in general, the lens mount is made of a material containing a liquid crystalline resin, and the guide is made of a resin other than the liquid crystal resin, for example, a material containing nylon. Like this, usually, lens mount and guide Since the components are composed of different kinds of materials, static electricity is likely to be generated when the lens mount is placed above and below the guide member, which causes malfunction of the lens mount.

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

The inventors of the present invention have thoroughly studied in order to solve the above problems. As a result, it has been found that the above liquid crystal resin composition for a camera module containing a liquid crystal resin, a specific non-conductive filler, a specific copolymer, and a specific conductive filler can be used in a specific ratio. The subject matter is such that the present invention has been completed. The present invention more specifically provides the following.

(1) A liquid crystal resin composition for a camera module, which comprises (A) a liquid crystalline resin, (B1) a fibrous non-conductive filler, and (B2) a non-fibrous non-conductive filler. At least one (B) non-conductive filler, (C) copolymer selected from (C1) olefin-based copolymer and (C2) styrene-based copolymer, and (D1) fibrous conductivity (D) Conductive filler composed of a filler and (D2) non-fibrous conductive filler, the content of the component (A) is 55 to 91% by mass, and the content of the component (B) is 5 to 20 mass. %, the content of the component (C) is 2 to 10% by mass, the content of the component (D1) is 1 to 5% by mass, and the content of the component (D2) is 1 to 15% by mass, and the above (B1) is fibrous. The non-conductive 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 non-conductive filler has an average particle diameter of 50 μm or less, and is a plate-like filler and a pellet. At least one selected from the group consisting of the above-mentioned (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 composed of a styrene-based and a glycidyl ester of an α,β-unsaturated acid, wherein the (D1) fibrous conductive filler has an average fiber length of 50 μm or more, and the (D2) non-fibrous conductive filler is The average particle diameter is 20 nm to 50 μm, and it is at least one selected from a plate-like filler and a particulate filler, and has a volume resistivity of 1 × 10 ⁴ to 1 × 10 ¹⁴ Ω ^. Cm.

(2) A component for a camera module is composed of a liquid crystal resin composition for a camera module described in (1).

(3): The parts for the camera module described in (2) are lens holders.

(4) A camera module comprising a lens mount and a camera module that serves as a guide for the pedestal of the lens mount, wherein the lens mount is a liquid crystal resin for the camera module described in (1) The composition is configured such that the guide member is made of a material other than the liquid crystal resin composition for the camera module.

When a component for a camera module is manufactured using a liquid crystalline resin composition for a camera module of the present invention as a raw material, a component for a camera module which is less likely to be raised on the surface and which is not easily charged is obtained.

1‧‧‧ camera module

10‧‧‧Substrate

11‧‧‧Optical components

12‧‧‧Guide wiring

13‧‧‧Lens mount

14‧‧‧Roller

15‧‧‧ lens

16‧‧‧IR filter

17‧‧‧Guide

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

Hereinafter, embodiments 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 crystalline resin composition for a camera module of the present invention contains (A) a liquid crystalline resin, (B) a non-conductive filler, (C) a copolymer, and (D) a conductive filler.

[(A) Liquid Crystal Resin]

The term "A) liquid crystalline resin used in the present invention means a melt-processable polymer having a property of forming an optical anisotropic molten phase. The nature of the anisotropic molten phase can be confirmed by a conventional polarized light inspection method using orthogonal photons. More specifically, the confirmation of the anisotropic molten phase can be carried out by observing the molten sample loaded on the Leitz hot step by using a Leitz polarizing microscope at a magnification of 40 times in a nitrogen atmosphere, and performing the anisotropic molten phase. Confirmation. When the liquid crystalline polymer which can be used in the present invention is inspected between orthogonal photoconductors, for example, even in a molten stationary state, it is usually transmitted through polarized light to optically exhibit anisotropy.

The type of the liquid crystal resin (A) is not particularly limited, but is preferably an aromatic polyester or an aromatic polyester decylamine. Further, a polyester system partially containing an aromatic polyester or an aromatic polyester decylamine in the same molecular chain is also in this range. When these are dissolved in pentafluorophenol at a concentration of 0.1% by weight at 60 ° C, it is preferred to use a logarithmic viscosity (IV) of preferably at least about 2.0 dl/g, and even more preferably 2.0 to 10.0 dl/g. .

The aromatic polyester or the aromatic polyester amide which is applicable to the (A) liquid crystalline resin of the present invention is particularly preferably composed of an aromatic hydroxycarboxylic acid, an aromatic hydroxylamine and an aromatic diamine. Group to choose An aromatic polyester or an aromatic polyester decylamine which has a repeating unit of one compound and is a constituent component.

More specifically, (1) a polyester mainly composed of one or two or more kinds of aromatic hydroxycarboxylic acids and derivatives thereof; (2) mainly composed of (a) an aromatic hydroxycarboxylic acid and a derivative thereof Or two or more kinds, (b) one or two or more kinds of aromatic dicarboxylic acids, alicyclic dicarboxylic acids, and derivatives thereof, and (c) aromatic diols, alicyclic diols, aliphatic groups a polyester composed of at least one or two or more of a diol and a derivative thereof; (3) one or two or more kinds of (a) aromatic hydroxycarboxylic acid and a derivative thereof, and (b) aromatic One or two or more kinds of a group of a hydroxylamine, an aromatic diamine, and a derivative thereof, and (c) one or more of an aromatic dicarboxylic acid, an alicyclic dicarboxylic acid, and a derivative thereof Polyesteramine; (4) mainly composed of (a) one or more aromatic hydroxycarboxylic acids and derivatives thereof, (b) aromatic hydroxylamines, aromatic diamines, and derivatives thereof Or two or more kinds, (c) one or two or more kinds of aromatic dicarboxylic acids, alicyclic dicarboxylic acids, and derivatives thereof, and (d) aromatic diols, alicyclic diols, aliphatic groups At least one or two of a diol and a derivative thereof Polyester amide and the like which are composed of the above. Further, a molecular weight modifier may be used in combination with the above-mentioned structural components as needed.

A preferred example of a specific compound which can be applied to the (A) liquid crystalline resin of the present invention is an aromatic hydroxycarboxylic acid such as p-hydroxybenzoic acid or 6-hydroxy-2-naphthoic acid, 2,6-di. Hydroxynaphthalene, 1,4-dihydroxynaphthalene, 4,4'-dihydroxybiphenyl, hydroquinone, resorcinol, a compound represented by the following formula (I), and the following An aromatic diol such as a compound represented by the formula (II); terephthalic acid, isophthalic acid, 4, 4'-di An aromatic dicarboxylic acid such as phenyldicarboxylic acid, 2,6-naphthalenedicarboxylic acid, or a compound represented by the following formula (III); p-aminophenol, p-phenylenediamine, etc. Aromatic amines.

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

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

The preparation system of the liquid crystalline resin (A) used in the present invention may be prepared by a conventional method using a monomer compound (or a mixture of monomers) by a direct polymerization method or a transesterification method, but usually A melt polymerization method, a paste polymerization method, or the like is used. The aforementioned compound having an ester forming ability can be directly used for polymerization in a still form, and can be denatured from a precursor to a derivative having the ester forming ability in a stage before polymerization. In the case of these polymerizations, various catalysts can be used, and as a representative series, dialkyl tin oxides, diaryl tin oxides, titanium oxides, alkoxy titanium silicates, titanium alkoxide metals, A carboxylic acid base and an alkaline earth metal salt, for example, a Lewis acid salt of BF _{3 or} the like. The amount of the catalyst used is generally from about 0.001 to 1% by mass, particularly from about 0.01 to 0.2% by mass, based on the total weight of the monomers. The polymer produced by these polymerization methods can be increased in molecular weight by solid phase polymerization by heating under reduced pressure or an inert gas, if necessary.

The melt viscosity of the (A) liquid crystalline resin obtained by the above method is not particularly limited. In general, a melt viscosity at a molding temperature of 10 MPa or more and 600 MPa or less can be used at a shear rate of 1000 sec ^-1 . However, the liquidity of the person who is too high in viscosity is very deteriorated, and therefore, it becomes unsatisfactory. Further, the liquid crystal resin (A) may be a mixture of two or more liquid crystal resins.

In the liquid crystalline resin composition for a camera module of the present invention, the content of the liquid crystal resin (A) is 55 to 91% by mass. When the content of the component (A) is at least 55% by mass, it is preferable because the fluidity and the fluffing of the surface of the molded body are suppressed. When the content of the component (A) is 91% by mass or less, It is desirable for the reason of heat resistance. Further, the desirable content of the component (A) is 60 to 80% by mass.

[(B) Non-conductive filler]

(B) The non-conductive filler is a fibrous non-conductive filler having (B1) an average fiber diameter of 1.0 μm or less and an average fiber length of 5 to 50 μm, and (B2) an average particle diameter of 50 μm or less and a plate-like filler and At least one filler selected from at least one non-fibrous non-conductive filler selected from the particulate filler.

(B1) Average fiber diameter of the fibrous non-conductive filler Below 1.0 μm, the ideal average fiber diameter is 0.3 to 0.6 μm. When the average fiber diameter is 1.0 μm or less, the fluff suppressing effect on the surface of the molded body tends to be high. Further, in the present specification, as the average fiber diameter, a solid microscope image is placed in a PC by a CCD camera, and a value measured by an image measuring machine and an image processing method is used.

Further, the (B1) fibrous non-conductive filler has an average fiber length of 5 to 50 μm, and the average fiber length is preferably 7 to 30 μm. When the average fiber length is 5 μm or more, it is easy to maintain the mechanical strength and the load bending temperature which are necessary for the camera module, and when the thickness is 50 μm or less, it is easy to increase the fluff suppressing effect on the surface of the molded body. Further, in the present specification, as the average fiber length, a solid microscope image is placed on a PC by a CCD camera, and a value measured by an image measuring machine and an image processing method is used.

If it is a fibrous non-conductive filler satisfying the above shape, any fiber may be used, but as the (B1) fibrous non-conductive filler series, for example, glass fiber, asbestos fiber, cerium oxide fiber, silicon ^dioxide. An inorganic fibrous material such as alumina fiber, zirconia fiber, boron nitride fiber, tantalum nitride fiber, boron fiber or potassium titanate fiber. Two or more kinds of fibrous non-conductive fillers can be used as the component (B1). In the present invention, it is preferred to use potassium titanate fibers as the component (B1).

(B2) The non-fibrous non-conductive filler is at least one selected from the group consisting of a plate-like filler and a particulate filler, having an average particle diameter of 50 μm or less. When the average particle diameter is 50 μm or less, the fluff suppressing effect on the surface of the molded article tends to be high. Preferably, the aforementioned average particle diameter is 10 to 20 μm. In addition, in the present specification, the laser diffraction/scattering particle size distribution is employed as the average particle diameter. The value measured by the measurement method.

Any non-fibrous non-conductive filler may be used as the above-mentioned shape, and any filler may be used. However, as a plate-shaped filler, talc, mica, glass, or the like is used. In addition, as a series of granular fillers, cerium oxide, quartz powder, glass granules, glass powder, calcium silicate, aluminum silicate, kaolin, clay, diatomaceous earth, strontium, etc.; iron oxide, a metal oxide 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; a tantalum carbide; a tantalum nitride; and a boron nitride. Two or more types can be used as the component (B2). In the present invention, the component (B2) is preferably cerium oxide using a platy filler, mica or a particulate filler, and more preferably a talc or mica using a plate-shaped filler.

The content of the component (B) (the total amount 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. When the content of the component (B) is 5% by mass or more, it is easy to secure the mechanical strength and the load bending temperature which are required for the camera module. When the content is 20% by mass or less, the effect of suppressing the raising of the surface of the molded article is easily improved. More preferably, the content is 10 to 20% 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. The component (C) is applied to a liquid crystal resin composition for a camera module, and when the molded body composed of the composition is ultrasonically cleaned, it contributes to suppressing the raising of the surface of the molded body.

The reason for suppressing the raising is not a clear reason, but it is considered that it is helpful to change the surface state of the formed body by training a certain amount of the change. To suppress hair raising.

The (C1) olefin-based copolymer is, for example, a copolymer composed of a repeating unit derived from an α-olefin and a repeating unit derived from a glycidyl ester of an α,β-unsaturated acid.

The α-olefin system is not particularly limited, and examples thereof include ethylene, propylene, butylene, and the like. However, it is preferable to use ethylene even in the case. The epoxypropyl ester of an α,β-unsaturated acid is shown by the following general formula (IV). The epoxypropyl ester of an α,β-unsaturated acid is, for example, glycidyl acrylate, glycidyl methacrylate, glycidyl ethacrylate, glycidyl itaconate, and the like. However, it is particularly preferred to be a glycidyl methacrylate.

In the (C1) olefin-based copolymer, the content of the repeating unit derived from the α-olefin is preferably 87 to 98% by mass, and the content of the repeating unit derived from the epoxypropyl ester of the α,β-unsaturated acid The amount is 13 to 2% by mass.

The (C1) olefin-based copolymer to be used in the invention may contain 0 to 48 parts by mass of acrylonitrile in addition to the above two components, in addition to the above two components, in addition to the above two components. One or two or more kinds of repeating units of an olefin-based unsaturated ester such as acrylate, methacrylate, α-methylstyrene or maleic anhydride are used as the third component.

The olefin-based copolymer which is a component (C1) of the present invention can be easily prepared by a usual radical polymerization method using a monomer corresponding to each component and a radical polymerization catalyst. More specifically, usually by Copolymerization of α-olefin and α,β-unsaturated acid in the presence or absence of a base generator in the presence or absence of 500 to 4000 atmospheres, 100 to 300 ° C, a suitable solvent or chain transfer agent The method of the base ester is carried out. Further, it may be produced by mixing a α-olefin, a glycidyl ester of an α,β-unsaturated acid, and a radical generator in a melt-graft copolymerization process in an extruder.

The (C2) styrene-based copolymer is, for example, a copolymer composed of a repeating unit derived from styrene and a repeating unit derived from a glycidyl ester of an α,β-unsaturated acid. The epoxy propyl ester of an α,β-unsaturated acid is the same as the (C1) component, and thus the description thereof is omitted.

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

The (C2) styrene-based copolymer to be used in the present invention may contain, in addition to the above two components, one or two or more kinds of repeating units derived from other vinyl monomers as the third component. polymer. One or two or more kinds of repeating units derived from an olefin-based unsaturated ester such as acrylonitrile, acrylate, methacrylate or maleic anhydride are suitable as the third component. The styrene-based copolymer containing 40% by mass or less of these repeating units in the styrene-based copolymer is preferably a component (C2).

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

(C2) The styrene-based copolymer can be prepared by a usual radical polymerization method using a monomer corresponding to each component and a radical polymerization catalyst. More specifically, it is usually also possible by the presence of a free radical generator a method of copolymerizing a styrene and a glycidyl ester of an α,β-unsaturated acid in the presence or absence of 500 to 4000 atmospheres, 100 to 300 ° C, a suitable solvent or a chain transfer agent, and Made for manufacturing. Further, it may be produced by mixing a styrene-based, a glycidyl ester of an α,β-unsaturated acid, and a radical generator in a melt-graft copolymerization process in an extruder.

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

(C) The content of the copolymer (the total amount of the (C1) component and the (C2) component) 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 in terms of the suppression of the pilling of the surface of the molded article, and the reason for obtaining a good molded body without impairing the fluidity is therefore 10% by mass or less. More preferably, the above content is 2 to 7 mass%.

[(D) Conductive Filler]

(D) The conductive filler is at least one selected from the group consisting of (D1) a fibrous conductive filler having an average fiber length of 50 μm or more and (D2) an average particle diameter of 20 nm to 50 μm and selected from a plate-shaped filler and a particulate filler. It is composed of a non-fibrous conductive filler.

Further, the (D1) fibrous conductive filler has an average fiber length of 50 μm or more. The above average fiber length must be 50 μm or more in terms of the charge prevention property. Further, the upper limit of the average fiber length is not particularly limited, but practically, for example, 10 mm is exemplified.

If it is a fibrous conductive filler satisfying the above shape In any case, as the (D1) fibrous conductive filler, for example, carbon fibers; conductive fibers such as metal fibers; glass fibers, whiskers, inorganic fibers, ore fibers, etc., may be used. A metal such as nickel or copper is applied to impart conductivity.

As the carbon fiber series, PAN-based carbon fibers using polyacrylonitrile as a raw material and pitch-based carbon fibers using pitch as a raw material are used.

As the metal fiber series, fibers composed of mild steel, stainless steel, steel and alloys thereof, copper, brass, aluminum and alloys thereof, titanium, lead, and the like are used. If these metal fibers are required to have electrical conductivity, in order to impart conductivity more, it is also possible to use other metals.

As the foregoing whisker series, a nitride whisker crystal, a triazine whisker crystal, a basic magnesium sulfate whisker, a barium titanate whisker crystal, a carbonized whisker crystal, a boron whisker crystal, or the like. As the aforementioned inorganic fiber series, it is made of asbestos, zirconia and alumina ^. A fiber composed of cerium oxide, potassium titanate, barium titanate, titanium oxide, cerium carbide, aluminum oxide, cerium oxide, blast furnace slag, or the like. As the series of the ore-based fibers, a fiber composed of asbestos or the like is used.

Two or more kinds of fibrous conductive fillers can be used as the component (D1). In the present invention, it is preferable to use PAN-based carbon fibers or pitch-based carbon fibers as the component (D1).

The content of the component (D1) is 1 to 5% by mass based on the resin composition for the camera module of the present invention. In the case where the charge prevention property is found, the content of the component (D1) must be 1% by mass or more, and it is necessary to adjust the conductivity in the semiconductive region and to suppress the decrease in fluidity or the deterioration of the fuzzing property. Below mass%. More preferably, the above content is 2 to 4% by mass.

(D2) The non-fibrous conductive filler is at least one selected from the group consisting of a plate-shaped filler and a particulate filler, having an average particle diameter of 20 nm to 50 μm. The above average particle diameter must be 20 nm or more in terms of suppressing the decrease in fluidity. The above average particle diameter must be 50 μm or less in terms of suppressing deterioration of surface smoothness.

In the case of a non-fibrous conductive filler satisfying the above shape, any filler may be used. However, as a plate-shaped filler, graphite or a plate-like metal powder (for example, aluminum, iron, copper) or the like may be used. Further, examples of the particulate filler include carbon black, granular metal powder (for example, aluminum, iron, copper), and granular conductive ceramics (for example, zinc oxide, tin oxide, indium tin oxide). Two or more types can be used as the component (D2). In the present invention, graphite or carbon black is preferably used as the component (D2).

In the state where the component (D2) is graphite, the average particle diameter is preferably 5 to 50 μm, and the thickness is preferably 0.5 to 10 μm.

In the state where the component (D2) is carbon black, the average particle diameter is preferably 20 to 100 nm.

The content of the component (D2) is 1 to 15% by mass based on the resin composition for the camera module of the present invention. The content of the component (D2) must be 1% by mass or more, and the content of the component (D2) must be 1% by mass or more, and 15% by mass or less, in order to suppress the decrease in the conductivity. More preferably, the content is 2 to 10% by mass.

[Other ingredients]

In the liquid crystal resin composition for a camera module of the present invention, other properties may be appropriately added in accordance with the required performance without impairing the effects of the present invention. a polymer, a conventional substance which is generally added to a synthetic resin, that is, a stabilizer such as an oxidation preventive or an ultraviolet absorber, a charge inhibitor other than the component (D), a coloring agent such as a flame retardant, a dye or a pigment, and the like. Agent, release agent and crystallization accelerator, crystal nucleating agent, and the like.

[Modulation of liquid crystal resin composition for camera module]

The modulation system of the resin composition for a camera module of the present invention is not particularly limited. For example, by performing the above-mentioned (A), (B), (C), and (D) components, a 1-axis or 2-axis extruder is used to perform melt-kneading treatment on these, thereby performing liquid crystallinity for a camera module. Modulation of the resin composition.

[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 the training. The shape of the above component (B) is the shape before the practice. If the shape before the training is as described above, the parts for the camera module that are not easily raised on the surface are obtained.

Similarly, the shape of the component (D) in the liquid crystalline resin composition for a camera module of the present invention is different from the shape of the component (D) before the training. The shape of the above component (D) is the shape before the practice. If the shape before the training is as described above, the parts for the camera module that are not easily charged are obtained.

The liquid crystal resin composition for a camera module of the present invention obtained as described above has a melt viscosity of preferably 50 Pa ^. Sec below. The aspect in which the fluidity is high and the formability is good is also a feature 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 according to 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 bending temperature of 200 ° C or higher. The aspect in which heat resistance is good is also a feature of the liquid crystalline resin composition for a camera module of the present invention. Further, the load bending temperature is a value measured by a method in accordance with ISO 75-1, 2.

The volume resistivity of the liquid crystalline resin composition for a camera module of the present invention is preferably 1 × 10 ⁴ to 1 × 10 ¹⁴ Ω ^. Cm. That is, the conductivity of the volume resistance value is adjusted to be a semiconductive region, whereby a good charge prevention property is found. The volume resistance value is less than 1 × 10 ⁴ Ω ^. At the time of cm, there is a state in which the conductivity is excessively high and a short circuit occurs. The aforementioned volume resistance value exceeds 1 × 10 ¹⁴ Ω ^. At the time of cm, there is a state in which the conductivity is excessively low and it is not easy to find a state in which the charge prevention property occurs.

<Parts and camera module for camera module>

A component for a camera module is manufactured by using the liquid crystal resin composition for the camera module. If the resin composition of the present invention is used as a raw material, the parts for the camera module are not easily charged. Therefore, the components for the camera module which are composed of the resin composition of the present invention are less likely to cause a malfunction due to static electricity.

Further, if the resin composition of the present invention is used as a raw material, the surface of the component for the camera module is not easily raised. Ultrasonic cleaning is performed on the parts of the camera module. Therefore, even if ultrasonic cleaning is performed, the surface is not easily raised. When the resin composition of the present invention is used, even if the ultrasonic cleaning of the parts for the camera module is performed under more severe conditions, there is no occurrence or almost no occurrence of falling off due to garbage or the like. Therefore, after the components for the camera module are assembled to the finished product, the garbage generated by the surface of the components for the camera module has almost no effect on the quality of the finished product.

A component for a camera module which is formed by molding a liquid crystal resin composition for a camera module of the present invention will be described. In Fig. 1, a cross section of a general camera module is schematically shown. As shown in FIG. 1, the camera module 1 includes a substrate 10, an optical element 11, a guide wire 12, a lens mount 13, a roller 14, a lens 15, an IR filter 16, and a guide 17.

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

The guiding member 17 is disposed on the substrate 10, and the lens holder 13 is disposed on the guiding member 17, and the guiding member 17 and the lens holder 13 cover the optical element 11. The lens mount 13 is formed at the top to form an opening, and a spiral groove portion is formed on the opening wall surface.

The drum 14 has a cylindrical shape, and the lens 15 is held inside the cylindrical shape to be roughly horizontal. Further, a spiral convex portion is formed on the side wall of one end of the cylinder, and the spiral 14 and the spiral groove formed on the opening wall surface of the lens mount 13 are screwed together, so that the drum 14 is coupled to the lens. Seat 13. Further, the IR filter 16 is disposed at one end of the drum 14 to close one end of the cylindrical drum 14. As shown in Fig. 1, the IR filter 16 and the lens 15 are arranged in a substantially parallel manner.

In the camera module 1 shown in FIG. 1, the lens mount 13 is a magnetic force generated by a coil (not shown) wound around the lens mount 13 and a permanent magnet disposed around the coil (not shown). The effect is to move up and down the upper side of the guide member 17 to change the distance between the lens 15 and the optical element 11. The focal length adjustment of the camera can be performed by adjusting the distance.

In the camera module 1 described above, the camera module liquid of the present invention can be used. The crystal resin composition is used as a raw material to manufacture a lens mount 13 which is a component for a camera module. A general liquid crystalline resin composition is not suitable as a raw material for manufacturing these parts. When the lens mount 13 is manufactured using a general liquid crystalline resin composition as a raw material, the following problems occur.

A molding system formed by forming a general liquid crystalline resin composition is easily charged in a negative electrode, and static electricity is generated between a resin which is easily charged by a positive electrode, for example, a molded body formed by molding a material containing nylon, and a camera mold is generated. Group, the reason for the bad action. Further, since the molecular alignment of the molding system polymer formed by molding a general liquid crystalline resin composition is particularly larger than the surface portion, the surface of the molded body is liable to fluff, and the raising is a cause of small garbage. When the small garbage adheres to the lens 15 or the like, the performance of the camera module is lowered.

Since the components for the camera module such as the lens mount 13 are for the purpose of removing dust or small garbage on the surface, ultrasonic cleaning is performed before being assembled in the camera module 1. However, since the surface of the molded body formed by molding a general liquid crystalline resin composition is likely to be raised, when the ultrasonic cleaning is performed, the feathers are erected on the surface. Because of such a problem, in general, it is impossible to perform ultrasonic cleaning on a molded body composed of a liquid crystal resin composition.

The focal length adjustment lens mount 13 is guided up and down by a magnetic force generated by a coil (not shown) wound around the lens mount 13 and a permanent magnet (not shown) disposed around the coil. The upper side of the lead member 17 is used for focus adjustment. At this time, in the first, the lens mount 13 which is formed of a molded body composed of a liquid crystal resin composition, and the molding including nylon or the like Electrostatic charges are generated between the guides 17 formed by the formed body of the material, and the lens mount 13 is liable to cause a malfunction. Next, in the second molding system in which a general liquid crystalline resin composition is formed, as described above, the surface is easily fluffed, and thus the surface may be peeled off to cause a peeling. The peeling material is likely to become small garbage, adhere to the lens 15, etc., and degrade the performance of the camera module.

As described above, in general, when a liquid crystal resin composition is used as a raw material of the lens holder 13, an accident is likely to occur. However, the liquid crystal resin composition for a camera module of the present invention is a molded body. In this case, even if the ultrasonic wave is washed in the molded body, the surface of the molded body is improved without causing problems with fluffing. Therefore, the material used as the lens mount 13 can be suitably used.

In the state in which the liquid crystal resin composition for a camera module of the present invention is used in the lens mount 13, the material of the guide member 17 is a liquid crystal resin composition for a camera module of the present invention, specifically List the nylon and so on.

[Examples]

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

<material>

^. Liquid crystal resin (liquid crystalline polyester phthalamide resin): VECTRA (registered trademark) E950i (made by Polyplastics Co., Ltd.)

^. Olefin-based copolymer: manufactured by Sumitomo Chemical Co., Ltd., BONDFAST 2C (ethylene-epoxypropyl methacrylate copolymer (containing 6 mass% of epoxypropyl methacrylate))

^. Fibrous conductive filler: manufactured by Toho Tengex Co., Ltd., HTC432 (PAN carbon fiber, average fiber diameter 10 μm, average fiber length 6 mm)

^. Non-fibrous conductive filler 1: manufactured by Nippon Graphite Industries Co., Ltd., CP (graphite, average particle size 10 μm, plate shape)

^. Non-fibrous conductive filler 2: VULCAN XC305 (carbon black, average particle size 20 nm, granular) manufactured by CABOT Co., Ltd., Japan

^. Fibrous non-conductive filler: manufactured by Otsuka Chemical Co., Ltd., TISMO N-102 (potassium titanate fiber, average fiber diameter 0.3 to 0.6 μm, average fiber length 10 to 20 μm)

^. Non-fibrous non-conductive filler: manufactured by Matsumura Industry Co., Ltd., CROWNTALC PP (talc, average particle size 12.8 μm, average depth-to-width ratio 6, plate shape)

<Manufacture of Liquid Crystal Resin Composition for Camera Module>

In the ratio shown in Table 1, a two-axis extruder (TEX30α type manufactured by Nippon Steel Works Co., Ltd.) was used, and the components were melt-kneaded at a cylinder temperature of 350 ° C to obtain liquid crystallinity for a camera module. Resin composition particles.

<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 pellets described above. Specifically, the melt viscosity of the appearance at a cylinder temperature of 350 ° C and a shear rate of 1000 sec ^-1 was measured according to ISO 11443 by a capillary galvanometer (CAPILOGRAPH 1D manufactured by Toyo Seiki Co., Ltd.: piston diameter: 10 mm). . For the measurement, a sieve having an inner diameter of 1 mm and a length of 20 mm was used. The results are shown in Table 1.

<bending test>

A bending test piece of 130 mm × 13 mm × 0.8 mm was produced from the above pellets, and the bending strength and the bending elastic modulus were measured in accordance with ASTM D790 using this. The results are shown in Table 1.

<Load bending temperature>

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

[forming conditions]

Cylinder temperature: 350 ° C

Mold temperature: 80 ° C

Back pressure: 2.0MPa

Injection speed: 33mm/sec

<Volume resistivity>

The volume resistivity was measured in accordance with ASTM D257 using a flat test piece of ψ 100 mm × 3 mmt. The results are shown in Table 1.

<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 by 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 molded body was used to cut half of it as a test piece.

[forming conditions]

Cylinder temperature: 350 ° C

Mold temperature: 90 ° C

Injection speed: 80mm/sec

[Evaluation]

The formed body was cut into half in water at room temperature, and applied to an ultrasonic cleaner (output 300 W, frequency 45 kHz) for 3 minutes. Then, the area (the raised area) of the portion where the surface of the molded body was erected was evaluated by the image measuring device (LUZEXFS manufactured by NIRECO Co., Ltd.) in comparison with the molded body applied before the ultrasonic cleaning machine. Further, the evaluation area was 750 mm ² (12.5 mm × 60 mm), and the ratio (%) of the above-mentioned raised area to the above-mentioned evaluation area was used as a result. The results are shown in Table 1.

The evaluation was made as the hair raising area was smaller and the raising inhibition effect was higher.

From the results described in Table 1, it was confirmed clearly that the volume resistivity of the molding system produced using the pellets of the examples was in the range of 1 × 10 ⁴ to 1 × 10 ¹⁴ Ω ^. Within the range of cm. Further, it was confirmed that even if the above-mentioned molding system was subjected to ultrasonic cleaning, the surface was not erected. From these results, it can be said that the molded body composed of the particles of the molding example has a more excellent charge prevention property and a surface state than the molded body composed of the usual liquid crystal resin composition particles of the comparative example. It is also quite different.

Further, it was confirmed that the molding system produced using the pellets of the examples had good heat resistance and impact resistance.

1‧‧‧ camera module

10‧‧‧Substrate

11‧‧‧Optical components

12‧‧‧Guide wiring

13‧‧‧Lens mount

14‧‧‧Roller

15‧‧‧ lens

16‧‧‧IR filter

17‧‧‧Guide

Claims (4)

The liquid crystal resin composition for a camera module includes: (A) a liquid crystalline resin, at least one selected from the group consisting of (B1) a fibrous non-conductive filler and (B2) a non-fibrous non-conductive filler (B) a non-conductive filler, at least one of (C) copolymer selected from (C1) an olefin-based copolymer and (C2) a styrene-based copolymer, and (D1) a fibrous conductive filler and (D2) (D) a conductive filler composed of a non-fibrous conductive filler, the content of the component (A) is 55 to 91% by mass, and the content of the component (B) is 5 to 20% by mass, (C) The content of the component is 2 to 10% by mass, the content of the component (D1) is 1 to 5% by mass, and the content of the component (D2) is 1 to 15% by mass, and the (B1) fibrous non-conductive filler is contained. The average fiber diameter is 1.0 μm or less and the average fiber length is 5 to 50 μm, and the (B2) non-fibrous non-conductive filler has an average particle diameter of 50 μm or less, and is selected from a plate-like filler and a particulate filler. In any one of the above, 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 a styrene-based compound. And the epoxy propyl ester of an α,β-unsaturated acid, wherein the (D1) fibrous conductive filler has an average fiber length of 50 μm or more, and the (D2) non-fibrous conductive filler has an average particle diameter. It is 20 nm to 50 μm and is at least one selected from a plate-like filler and a particulate filler, and has a volume resistivity of 1 × 10 ⁴ to 1 × 10 ¹⁴ Ω ^. Cm. A component for a camera module is composed of a liquid crystal resin composition for a camera module according to the first aspect of the invention. For example, the parts for the camera module of the second application of the patent scope, Mirror mount. A camera module comprising a lens mount and a camera module as a guide for the pedestal of the lens mount, wherein the lens mount is a liquid crystal resin for a camera module according to claim 1 The composition is configured such that the guide member is made of a material other than the liquid crystal resin composition for the camera module.