KR101831543B1 - Wholly aromatic liquid crystal polyester resin composition and camera module component including injection-molded article of same as constituent member - Google Patents

Abstract

A wholly aromatic liquid crystal polyester resin composition capable of molding a camera module component having a small number of particles generated when a portable terminal device such as a smart phone equipped with a camera is impacted or dropped is obtained.
(100% by mass or more in total) of 50 to 80 mass% of wholly aromatic liquid-crystalline polyester, 10 to 30 mass% of whisker, 0.5 to 5 mass% of carbon black, 0 to 20 mass part of talc, and 3 to 20 mass parts of precipitated barium sulfate And a melt viscosity of 20 to 100 Pa · S at a shear rate of 100 sec-1 and a melting point of +10 ° C, which is obtained by melt-kneading a polyester Can be realized by a resin composition.

Description

TECHNICAL FIELD [0001] The present invention relates to a wholly aromatic liquid crystal polyester resin composition and a camera module component including the injection molded article as a constituent member. [0002] The present invention relates to a wholly aromatic liquid-

In a mounting type small digital camera such as a smart phone and a tablet type terminal, performance improvement such as the number of pixels and image quality has progressed and it has become a main function part from the additional function part.

Along with this, a problem of preventing the particles, which are separated from the surface of the camera module component, from adhering to the lens is now being solved, and its countermeasure has been studied. The present invention relates to a liquid crystal polyester resin composition suitably used for such a camera module component, and also relates to a camera module component including a molded product obtained by injection molding the liquid crystal polyester resin composition as a constituent member.

Most of these studies have focused on camera module parts and particles which are removed from the surface of the member by sliding the lens module when the autofocus function is exerted (Patent Documents 1 to 4).

However, in recent years, as the lifestyle changes and the weight of smart phones and portable terminal devices have been increased, the number of portable phones has increased, and as devices and members have been designed, miniaturized, and thinned, (Hereinafter referred to as " particle detachment resistance in particle " with respect to suppression of particles generated in the latter case) in addition to the particles that are generated when the apparatus is impacted, It is becoming a task now.

Japanese Patent Application Laid-Open No. 2009-242453 Japanese Patent Application Laid-Open No. 2009-242454 Japanese Patent Application Laid-Open No. 2009-242455 Japanese Patent Application Laid-Open No. 2009-242456

In view of the above situation, the inventors of the present invention have to solve the problem of obtaining a wholly aromatic liquid crystal polyester resin composition capable of molding a camera module component having a small number of particles generated when a mobile terminal device such as a smart phone equipped with a camera is impacted or dropped to be.

Accordingly, it is an object of the present invention to provide a wholly aromatic liquid-crystalline polyester resin composition which is capable of obtaining an injection-molded article excellent in desorbing property in a particle required in recent camera module parts.

Means for Solving the Problems As a result of intensive investigations to achieve the above object, the present inventors have found that, by injection molding a wholly aromatic polyester resin composition and a wholly aromatic polyester resin composition comprising a whisker and carbon black, Have found that an injection-molded article can be obtained, and have completed the present invention.

That is, the first aspect of the present invention is a method for producing a liquid crystal display panel, which comprises 50 to 80 mass% of wholly aromatic liquid-crystalline polyester, 10 to 30 mass% of whisker, 0.5 to 5 mass% of carbon black, 0 to 20 mass parts of talc, 3 to 20 mass parts of precipitated barium sulfate A melt deflection temperature of 220 ° C or more and a melt viscosity of 20 to 100 Pa · S at a shear rate of 100 sec-1 and a melting point + 10 ° C, which is obtained by melt kneading (to 100 mass% The present invention relates to a wholly aromatic liquid-crystalline polyester resin composition.

The second aspect of the present invention relates to the wholly aromatic liquid-crystalline polyester resin composition according to claim 1, wherein the whisker is at least one of calcium silicate and calcium carbonate having a true specific gravity of 3.0 or less.

A third aspect of the present invention relates to a camera module component comprising an injection molded article of the wholly aromatic liquid-crystalline polyester resin composition according to the first or second aspect of the present invention as a constituent member.

The wholly aromatic liquid-crystalline polyester resin composition according to the present invention is excellent in rigidity, heat resistance, mechanical strength, thin workability of a resin composition, mold shape transferability, surface mount (SMT) resistance of a molded article, And a member for a camera module having very excellent characteristics can be provided by injection molding.

1 is a plan view and a side view of a test piece for measuring a weld strength.
2 is a plan view and a side view of a test piece for measuring the desorbing property in the particle.

The wholly aromatic liquid-crystalline polyester resin used in the present invention exhibits melt anisotropy. In the wholly aromatic liquid-crystalline polyester resin composition of the present invention, in order for the molded article to have excellent heat resistance and rigidity, anisotropy based on the rigidity of the molecular structure is used, and strong liquid crystal orientation . Therefore, among the liquid crystal polyester, the wholly aromatic liquid-crystalline polyester obtained by the polycondensation reaction of an aromatic compound alone is mainly obtained by securing the so-called " mesogen " (rigid region expressing liquid crystallinity) Temperature, and rigidity of the molecular chain are excellent because of their excellent liquid crystallinity.

Examples of the structural unit of the liquid crystal polyester resin constituting the liquid crystal polyester resin composition of the present invention include a combination of an aromatic dicarboxylic acid, an aromatic diol and an aromatic hydroxycarboxylic acid, a different aromatic hydroxycarboxylic acid , Those obtained by combining an aromatic hydroxycarboxylic acid with an aromatic dicarboxylic acid and an aromatic diol, those obtained by reacting an aromatic hydroxycarboxylic acid with a polyester such as polyethylene terephthalate, and the like. Specific structural units include , For example, the following.

Structural unit derived from aromatic hydroxycarboxylic acid:

Structural unit derived from aromatic dicarboxylic acid:

Repeating structural units derived from an aromatic diol:

From the viewpoint of balance between heat resistance, mechanical properties and molding processability, preferred liquid crystalline polyester resins are those having a structural unit (A1) content of 30 mol% or more, more preferably 60 mol% Or more.

Particularly preferred liquid crystal polyesters contain 80 to 100 mol% (based on the total weight of the liquid crystal polyester) of p-hydroxybenzoic acid (I), terephthalic acid (II) and 4,4'- dihydroxybiphenyl (I) and (II) is 60 mol% or more) and 0 to 20 mol% of other aromatic compounds capable of undergoing a de-condensation reaction with any one of (I), (II) (I), terephthalic acid (II), 4,4'-dihydroxybiphenyl (III) (including derivatives thereof) having a melting point of 320 ° C or higher, which is obtained by polycondensing (I), (II) and (III), and from 90 to 99 mol% of the other aromatic groups capable of being subjected to a decondensation reaction Is a wholly aromatic liquid-crystalline polyester having a melting point of 320 deg. C or higher, obtained by polycondensation of 1 to 10 mol% of a compound (the sum thereof is 100 mol%).

As the combination of the structural units,

(A1)

(A1), (B1), (C1)

(A1), (B1), (B2), (C1)

(A1), (B1), (B2), (C2)

(A1), (B1), (B3), (C1)

(A1), (B1), (B3), (C2)

(A1), (B1), (B2), (C1), (C2)

(A1), (A2), (B1), (C1)

The preferable and particularly preferable monomer composition ratio is 80 to 100 mol% of p-hydroxybenzoic acid, terephthalic acid, 4,4'-dihydroxybiphenyl (including derivatives thereof) and the other aromatic diols Aromatic hydroxycarboxylic acid, aromatic hydroxycarboxylic acid, aromatic dicarboxylic acid, aromatic dicarboxylic acid, and aromatic dicarboxylic acid, and 0 to 20 mol% (summed up to 100 mol% thereof) of the aromatic compound. When the content of p-hydroxybenzoic acid, terephthalic acid and 4,4'-dihydroxybiphenyl is 80 mol% or less, heat resistance tends to be lowered, which is not preferable. In the resin composition of the present invention, the composition of the liquid crystalline polyester resin is set in the range of 50 to 80 mass%. Deviating from this range, it becomes difficult to obtain sufficient injection molding characteristics (melt fluidity, short cycle time, etc.).

As a method of producing the liquid crystal polyester resin used in the present invention, a known method may be employed, and a production method by melt polymerization only, or a two-step polymerization method by melt polymerization and solid phase polymerization can be used. As a specific example, a monomer selected from an aromatic dihydroxy compound, an aromatic hydroxycarboxylic acid compound, and an aromatic dicarboxylic acid compound is placed in a reactor, and acetic anhydride is added to acetylate the hydroxyl group of the monomer. Then, deacetic acid polycondensation reaction Lt; / RTI > For example, p-hydroxybenzoic acid, terephthalic acid, isophthalic acid, and 4,4'-dihydroxybiphenyl are fed into a reactor under a nitrogen atmosphere, acetic anhydride is added thereto, and acetoxylation is carried out under refluxing acetic anhydride. Followed by elevating the temperature to distill off acetic acid at a temperature in the range of 150 to 350 ° C to carry out deacetic acid melt polycondensation to produce a polyester resin. The polymerization time can be selected in the range of 1 hour to several tens of hours. In the production of the liquid crystalline polyester resin used in the present invention, the water in the monomer may be dehydrated and dried before the preparation, or may not be performed.

When the solid-state polymerization is further performed on the aggregate obtained by the melt polymerization, the polymer obtained by the melt polymerization is pulverized after solidification to obtain a powder or flake, and then solid-phase polymerization methods known in the art such as, for example, And a heat treatment in a temperature range of 200 to 350 DEG C for 1 to 30 hours in a gas atmosphere is preferably selected. The solid phase polymerization may be carried out with stirring or without stirring.

The catalyst may be used in the polymerization reaction, or may not be used. As the catalyst to be used, conventionally known catalysts for polycondensation of polyester may be used, and metal catalysts such as magnesium acetate, stannous acetate, tetrabutyl titanate, lead acetate, sodium acetate, potassium acetate and antimony trioxide, -Methylimidazole, and the like.

The polymerization reaction apparatus in the melt polymerization is not particularly limited, but a reaction apparatus used for the reaction of common high-viscosity fluids is preferably used. Examples of such a reaction apparatus include a stirrer type polymerization reaction apparatus having an agitating device having an agitating blade of various shapes such as an anchor type, a multi-stage type, a spiral band type, a helical shaft type, etc., A mixing device used for kneading a resin such as a bombardment mixer, and the like.

The shape of the liquid crystal polyester resin used in the present invention may be any of powder, granular, and pellet shapes, but powdery or granular is preferable from the viewpoint of dispersibility at the time of mixing with a filler.

<About Whiskers (Needle Single Crystals)>

The liquid crystal polyester resin composition may contain various fiber fillers in various cases, and it is known that the liquid crystal polyester resin composition exhibits excellent heat resistance and rigidity due to its shape factor. In the present invention, it is necessary to include a so-called &quot; whisker &quot; which is a needle-like single crystal as a fibrous filler, and to contain fillers different therefrom at specific mixing ratios.

"Disintegration in particles" of the liquid crystalline polyester resin composition for a camera module is remarkably improved by containing a whisker as a fibrous filler in the resin composition having a specific composition as described above.

The present inventors have not yet clarified the reason for this, but it is possible to make a comparison with a glass fiber as a representative example of a fibrous filler.

It has been clarified that the particles in the falling impact of the liquid crystal polyester resin composition containing various fillers are mainly fibrils derived from fragments of various fibrous fillers and destruction of liquid crystal polyester matrix.

It can be considered that generation of particles is caused largely by the destruction mode of interfacial peeling between a fibrous filler having a large aspect ratio and a large size (length) among the fillers and the liquid crystal polyester.

In a needle-shaped single crystal produced by melt-spinning and melt-blowing and having a surface shape and a fractured cross-sectional shape of rough glass fiber and a comparatively smooth surface shape and a fractured cross-sectional shape thereof produced by crystal growth, a liquid crystal polyester Are different from each other in microstructure, and it is expected that the mode of destruction at the interface will be different.

For example, a needle-like monocrystalline interface having a relatively smooth surface and a liquid crystal polyester resin are easily peeled to form a large number of minute voids, absorb impact energy by forming voids thereof, It can be considered that the destruction at the matrix portion connected with the generation of the brill (one of the main components of the &quot; particle &quot;) is suppressed.

The whiskers usable in the present invention are not limited. Preferably, among whiskers, an average diameter of 5 占 퐉 or less having toughness is suitable. Concretely, it is preferable to use (i) potassium titanate (chemical formula: K2O.nTiO2 wherein n is 6 or 8, true specific gravity of 3.4 to 3.6, average fiber diameter of 0.3 to 0.6 m, (Ii) calcium silicate (chemical formula: CaSiO3, true specific gravity of 2.5 to 2.6, fiber diameter of 1 to 5 μm, available from the market as "Walast Knight"); (Iii) calcium carbonate (chemical formula: CaCO3, true specific gravity of 2.8, average fiber diameter of 0.5 to 1 占 퐉, available from the market as "Wiscale" (manufactured by Maruo Calcium Co., Ltd.) (Iv) zinc oxide, (chemical formula: ZnO, true specific gravity: 5.78, average fiber diameter: 0.2 to 3 μm, available from Panasonic Co., Ltd. under the trade name "Panatetra" Among them, it is easy to handle in the kneading process, and from the viewpoint of easiness of dispersion among the liquid-crystalline polyesters constituting the matrix (Ii) and (iii), which have a relatively large fiber diameter and a small difference in specific gravity with respect to the liquid crystal polyester and can be easily dispersed, are preferable. These may be used alone or in combination of two or more, The whisker content in the resin composition of the present invention is preferably in the range of 10 to 30 mass%. If the content is less than 10 mass%, the effect of addition is insufficient, %, It may be difficult to obtain good fluidity.

<Precipitated barium sulfate>

 The liquid crystal polyester resin composition in the present invention contains precipitated barium sulfate. Barium sulfate is a filler having a substantially spherical shape and has a low probability of taking an interface delamination mode connected by the generation of particles and also has an impact energy absorption of the liquid crystal polyester composition due to its specific high ratio (about 4.5) It can be considered that the efficiency is improved and the effect of suppressing particle generation is given. In addition, it can be considered that an amorphous, very thin, soft, and hardly destructive substance is linked to the inhibition of particle generation. In the resin composition of the present invention, when the precipitating barium sulfate is added, its content is preferably in the range of 3 to 20 mass%. When the amount is less than 3 mass%, the effect of addition is not sufficient, and when it exceeds 20 mass%, it may be difficult to obtain good fluidity.

<Talc>

 In the present invention, the liquid crystal polyester resin composition preferably contains talc. Talc is a filler having a relatively flat surface with an almost elliptic sphere shape and imparts dimensional stability to the molded product by reducing the anisotropy. Therefore, even when the camera module component is used for a long period of time, . In the resin composition of the present invention, when talc is added, its content is preferably in the range of 5 to 20% by mass. When the amount is less than 5 mass%, the effect of addition is not sufficient. When it exceeds 20 mass%, it may be difficult to obtain good fluidity.

<About carbon black>

 The carbon black used in the present invention is used for securing the light shielding property of a camera module component and is not particularly limited as long as it is generally available for use in resin coloring.

In the resin composition of the present invention, the content of carbon black is preferably in the range of 0.5 to 5% by mass. More preferably 2 to 4% by mass. If the blending amount of the carbon black is less than 0.5% by mass, the luster of the obtained resin composition is lowered and the light shielding property can not be sufficiently secured. If the blending amount exceeds 5% by mass, And the possibility of occurrence of protrusions having a fine odontoid structure) is increased.

The composition of the present invention may further contain additives such as antioxidants and heat stabilizers (for example, hindered phenol, hydroquinone, phosphites and substituents thereof), ultraviolet absorbers (for example, (Higher fatty acids such as montanic acid and its salts, esters, partial esters, and stearic acid and its salts, esters, and stearyl alcohols), higher alcohols such as benzyl alcohol , Polyolefin waxes such as stearyl amide and polyethylene wax), plasticizers, antistatic agents and flame retardants, other fillers other than the above, and other thermoplastic resins may be added to impart certain properties. Further, the glass fiber has a large number of generated particles and is not suitable for the purpose of the present invention (see Comparative Example).

The liquid crystal polyester resin composition according to the present invention is obtained by melting the liquid crystal polyester and kneading the same with other components, but the equipment and the operating method used for melt kneading are not particularly limited as long as they are generally used for melt kneading of liquid crystal polyester .

Preferably, a method of introducing liquid crystal polyester, whisker, carbon black and precipitated barium sulfate from a hopper into a kneader having a pair of screws, and, if necessary, introducing talc to melt and knead the mixture into pellets Do.

These are called biaxial extruders, and among them, it is preferable to use a two-directional rotary type which enables homogeneous dispersion of filler and inhibition of local heat generation by having a switching mechanism.

&Lt; Range of melt viscosity &gt;

In the present invention, the melt viscosity measured at a shear rate of 100 sec ^-1 and a melting point + 10 ° C of the liquid crystalline polyester resin composition thus obtained is in the range of 20 to 100 Pa · S, preferably 30 to 80 Pa · S . If the resin viscosity is out of this range, the surface properties of the injection-molded article are deteriorated, and there is a fear of generation of particles caused by this. The melt viscosity is from Intesco Co., Ltd. cache using a capillary rheometer (Model2010), a capillary diameter of 1.00mm, length of 40mm, using the inflow angle of 90 °, the melting point -40 ℃ a shear rate of 100sec ^-1 At an elevation rate of + 4 deg. C / min, the apparent viscosity is measured, and the apparent viscosity at the melting point + 10 deg.

<On the load deflection temperature>

 In the present invention, it is necessary that the injection-molded article of the liquid-crystalline polyester resin composition thus obtained has a load deflection temperature of 220 캜 or higher. Here, the load deflection temperature means a load deflection temperature (DTUL) measured in accordance with ASTM D648. If the load deflection temperature is lower than 220 占 폚, there is a fear that heat resistance at the time of solder reflow in surface mounting may be problematic.

The resin composition according to the present invention is characterized in that the individual characteristics of these constituent materials and the good fluidity are exerted in the injection molding step in particular, and in particular, the molding of an injection-molded article having a thin- To provide a camera module component having excellent &quot; intra-particle detachability &quot;. The injection molding machine used for the injection molding is not particularly limited as long as it is a commonly used one generally used for molding a liquid crystal polyester.

<Examples>

Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

Production examples of liquid crystal polyester (LCP) are shown below.

(Production Example Preparation of Thermotropic Liquid Crystalline Polyester A)

296 kg (2.16 kilo mol) of p-hydroxybenzoic acid (manufactured by Ueno Pharmaceutical Co., Ltd.), 4,4'-dihydroxybenzoic acid (manufactured by Kobe Steel Co., Ltd.) 90 kg (0.54 kilo mol) of terephthalic acid (manufactured by Mitsui Chemicals, Inc.), 30 kg (0.18 kilo mol) of isophthalic acid (manufactured by Ajinomoto International Chemical Co., Ltd.) 0.04 kg of potassium acetate (manufactured by Kishida Chemical Co., Ltd.) and 0.10 kg of magnesium acetate (manufactured by Kishida Chemical Co., Ltd.) were charged as a catalyst, and the polymerization vessel was evacuated twice with nitrogen to carry out nitrogen substitution. Thereafter, 386 kg Mol) was added, and the mixture was heated to 150 DEG C for 1.5 hours at a rotation speed of 45 rpm of a stirring blade, and subjected to acetylation reaction in a refluxing state for 2 hours. After completion of the acetylation, the temperature was elevated to 0.5 占 폚 / min with the acetic acid outflow state, and when the reactor temperature reached 305 占 폚, the polymer was taken out from the outlet at the lower portion of the reactor and cooled and solidified by the cooling device. The resulting polymer was pulverized by a pulverizer manufactured by Hosokawa Micron Co., Ltd. to a size passing through a 2.0 mm sieve to obtain a prepolymer.

The obtained prepolymer was subjected to solid phase polymerization using a rotary kiln manufactured by Takasago Industrial Co., The prepolymer was filled in the kiln and nitrogen was flown at a flow rate of 16 Nm 3 / hr. The heater temperature was raised from room temperature to 350 캜 for 1 hour at a rotation speed of 2 rpm, and maintained at 350 캜 for 10 hours. It was confirmed that the temperature of the resin powder in the kiln reached 295 DEG C, and the heating was stopped. The kneading was continued for 4 hours while rotating the rotary kiln to obtain a powdery liquid-crystalline polyester. The melting point was 360 占 폚 and the melt viscosity was 70 Pa 占 퐏. The melting point was measured in accordance with ISO11357-3 and ASTM D3418 (hereinafter the same).

(Production Example Preparation of Thermotropic Liquid Crystalline Polyester B)

A prepolymer was obtained in the same manner as in the thermotropic liquid crystal polyester A. The obtained prepolymer was subjected to solid phase polymerization using a rotary kiln manufactured by Takasago Industrial Co., The kiln was filled with the prepolymer, and nitrogen was flown at a flow rate of 16 Nm 3 / hr. The heater temperature was raised from room temperature to 350 캜 for 1 hour at a rotation speed of 2 rpm, and maintained at 350 캜 for 9 hours. It was confirmed that the temperature of the resin powder in the kiln reached 290 DEG C and the heating was stopped. The kneading was continued for 4 hours while rotating the rotary kiln to obtain a powdery liquid-crystalline polyester. The melting point was 350 占 폚 and the melt viscosity was 20 Pa 占 퐏.

(Production example: Production of thermotropic liquid crystal polyester C)

A prepolymer was obtained in the same manner as in the thermotropic liquid crystal polyester A. The obtained prepolymer was subjected to solid phase polymerization using a rotary kiln manufactured by Takasago Industrial Co., The prepolymer was charged into the kiln, and nitrogen was passed through at a flow rate of 16 Nm 3 / hr. The heater temperature was raised from room temperature to 350 캜 for 1 hour at a rotation speed of 2 rpm, and maintained at 350 캜 for 11 hours. After confirming that the temperature of the resin powder in the kiln reached 300 캜, the heating was stopped and cooling was carried out for 4 hours while rotating the rotary kiln to obtain a powdery liquid-crystalline polyester. The melting point was 370 占 폚 and the melt viscosity was 140 Pa 占 퐏.

(Production example: Production of thermotropic liquid crystal polyester D)

(1.43 kilo moles) of p-hydroxybenzoic acid (manufactured by Ueno Pharmaceutical Co., Ltd.), 4,4'-di &lt; RTI ID = 0.0 &gt; , 64.0 kg (0.385 kilo mol) of terephthalic acid (manufactured by Mitsui Chemicals, Inc.), 0.06 kg of potassium acetate (manufactured by Kishida Chemical Co., Ltd.) as a catalyst, 100 g of magnesium acetate (Manufactured by Kishida Chemical Co., Ltd.), and the polymerization vessel was evacuated under reduced pressure twice with nitrogen to perform nitrogen substitution. Thereafter, 242.6 kg (2.4 kilo mol) of acetic anhydride was added, and the mixture was stirred at a rotation speed of 45 rpm And the mixture was heated at reflux for 1.5 hours to conduct an acetylation reaction for 2 hours. After completion of the acetylation, the reactor was heated to 0.5 DEG C / min in an acetic acid-outflow state, and the polymer was taken out from the outlet at the bottom of the reactor at 305 DEG C and cooled and solidified by a cooling device. The resulting polymer was pulverized by a pulverizer manufactured by Hosokawa Micron Co., Ltd. to a size passing through a 2.0 mm sieve to obtain a prepolymer.

The obtained prepolymer was subjected to solid-phase polycondensation using a rotary kiln manufactured by Takasago Industrial Co., Ltd. The shape of kiln inner tube is generally regular hexagonal shape, and one side is 500mm long and the whole length is 3500mm. The prepolymer was charged to 150 kilograms of the kiln, nitrogen was circulated for 15 Nm3, and the temperature inside the heater was increased from room temperature to 400 DEG C for 5 hours at a rotation number of 2 rpm, and the temperature was maintained at 400 DEG C for 12 hours. After confirming that the temperature of the pulverized material reached 340 캜, the heating was stopped, and the furnace was cooled for 7 hours while rotating the rotary kiln to obtain wholly aromatic liquid-crystalline polyester D. The melting point was 380 占 폚 and the melt viscosity was 70 Pa 占 퐏.

The characteristics of various fillers used in Examples and Comparative Examples related to the present invention are shown below.

(1) Whisker:

(i) potassium titanate: chemical formula: K2O.nTiO2: n is 6 or 8, true specific gravity is 3.4 to 3.6, fiber diameter is 0.3 to 0.6 mu m (trade name: TISMO, manufactured by Otsuka Chemical Co.,

(ii) Calcium silicate: Chemical formula: CaSiO3, true specific gravity 2.5 to 2.6, average fiber diameter 1 to 5 占 퐉 (available under the name of "Walarst Knight"

(iii) Calcium carbonate: Chemical formula: CaCO3, true specific gravity of 2.8, average fiber diameter of 0.5 to 1 占 퐉 (trade name: Wiscale, manufactured by Maruo Calcium Co.,

(iv) zinc oxide: (formula: ZnO true specific gravity: 5.78 average fiber diameter: 0.2 to 3 탆 (trade name: Panatetra,

(2) Carbon black (CB): "REGAL 660" (primary particle diameter 24 nm) manufactured by Cabot Co.,

(3) Precipitated barium sulfate: "BMH-40" (average particle diameter 1 μm, specific gravity 4.5, manufactured by Sakai Chemical Industry Co., Ltd.)

(4) Talc: "MS-KY" (number average particle diameter 23 μm) manufactured by Japan Talc Co.,

(5) Glass fiber.

PF100E-001SC (number average fiber length 100 mu m, number average fiber diameter 10 mu m) manufactured by Nitto Denshi K.K.,

(Test Methods)

(1) Measurement of melt viscosity

The melt viscosity of the thermotropic liquid crystal polyester resin composition was measured using a capillary rheometer (manufactured by Intesco Co., Ltd.) having a diameter of 1.00 mm, a length of 40 mm and an inlet angle of 90 DEG as a capillary, The apparent viscosity was measured at a shear rate of 100 sec -1 (melting point -40 ° C) to a rate of temperature increase of + 4 ° C / min, and the apparent viscosity at the melting point + 10 ° C was determined It was called Chi. For the test, a resin composition previously dried in an air oven at 150 占 폚 for 4 hours was used.

(2) Measurement of Weld Strength

(Molding of test piece)

Using the injection molding machine (UH-1000, manufactured by Nissei Plastic Industries Co., Ltd.), the obtained pellets of the resin composition were subjected to a test at a cylinder maximum temperature of 370 占 폚, an injection speed of 300 mm / sec and a mold temperature of 80 占 폚. The resin was injected with a two-point gate. The mold has a cavity of 48 mm x 15 mm x 0.3 mm and used to generate a weld across the molded article by impacting the melt front of the injected resin, usually from a different gate at its center. A plan view and a side view of the test piece obtained from this mold are shown in Fig.

(Evaluation of Weld Strength)

Five test pieces per item were arranged on the resin frame so that both ends of the frame were arranged in the frame window with the frame and the weld, and both ends of the frame were fixed to the frame with the adhesive tape. The frame holding the test piece adhered thereto was dropped five times from the height of 1.5 m, and the presence or absence of cracks in the welded portion was confirmed by a magnifying glass. &Quot; No cracking occurred &quot;, and &quot; x &quot; (See Table 1)

(3) Measurement of load deflection temperature (DTUL)

The obtained pellets of the resin composition were injection molded to obtain an injection molded product having a cylinder maximum temperature of 370 占 폚, an injection speed of 100 mm / sec, a mold temperature of 80 占 폚, 13 mm (width) 占 130 mm (length) The test specimens were used to measure the load deflection temperature. For each test piece, the load deflection temperature was measured in accordance with ASTM D648. As a criterion of the surface mount adaptability, "O" was determined to be 220 ° C. or higher, and "X" was evaluated to be 220 ° C. or less.

(4) Measurement of desorption of particles in a camera module

(Molding of test piece)

Using the injection molding machine (UH-1000, manufactured by Nissei Plastic Industries Co., Ltd.), the obtained pellets of the resin composition were subjected to a test at a cylinder maximum temperature of 370 占 폚, an injection speed of 300 mm / sec and a mold temperature of 80 占 폚. The resin was injected by a one-point gate. The mold had a circular concave portion of 6 mm in diameter at the center of a square shape of 8 mm in one piece, and also had a window of 3 mm in diameter at its center. The minimum thickness is 0.9 mm. In addition, although the window portion of the molded article corresponds to the lens inserting portion of the actual camera module component, in such a molded article, spot weld is inevitably generated. A plan view and a side view of the test piece obtained from this mold are shown in Fig.

(Evaluation of desorbing property in particle)

50 test pieces were housed in an SUS container, and the lid was closed. After dropping the container 50 times from the height of 1.5 m, the lid was opened to separate the test piece and the particles dropped from the test piece, and the number of particles was counted by "FPIA-3000" manufactured by Sysmex.

The evaluation of the anti-tear particles was evaluated in three stages, and the number of generated particles in the range of less than 100 was evaluated as &quot;? &Quot;, those in the range of 100 to less than 200 were evaluated as &quot; X &quot;.

(5) Evaluation of anisotropy

The evaluation was made by the difference in molding shrinkage between the TD direction and the MD direction. Five test specimens for measuring the "load deflection temperature" obtained in the above item (3) were left at room temperature for 24 hours or more, and the width as the MD (molding) direction and the width as the TD (lateral) In mm. The average values of these dimensions were compared with the actual dimensions (&quot; length &quot; = 130.02 mm, &quot; width &quot; = 13.02 mm) of molds to obtain molding shrinkage ratios in the TD and MD directions.

The difference between the molding shrinkage ratio in the TD direction and the MD direction was less than 8 times, &quot;? &Quot;

&Lt; Industrial Availability >

The camera module component comprising the injection molded product of the wholly aromatic liquid crystal polyester resin composition according to the present invention as a constituent member can be applied to the injection molding of a component having a thin portion having heat resistance to withstand solder reflow, , And after being mounted on a product, it is excellent in "disintegration in particle" at the time of dropping the product, so that the lens barrel in a camera, a mobile phone, a laptop computer, a digital camera, a digital video camera, a smart phone, A mount holder portion, a frame of a CMOS (image sensor), a shutter and a shutter bobbin portion, and the like.

Claims (3)

The total content of the total aromatic liquid-crystalline polyester is 50 to 80 mass%, whisker 10 to 30 mass%, carbon black 0.5 to 5 mass%, talc 0 to 20 mass%, and precipitating barium sulfate 3 to 20 mass% And a melt viscosity of 20 to 100 Pa · s at a shear rate of 100 sec-1 (melting point + 10) ° C,
Wherein the whisker is at least one of calcium silicate and calcium carbonate having a true specific gravity of 3.0 or less. delete A camera module component comprising an injection molded article of the wholly aromatic liquid-crystalline polyester resin composition according to claim 1 as a constituent member.

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