JP5727229B2 - Liquid crystalline resin composition - Google Patents

Description

  The present invention relates to a technique for stabilizing a measuring time when injection molding a liquid crystalline resin composition containing glass fibers.

  Liquid crystalline resins typified by liquid crystalline polyester resins are widely used as highly functional engineering plastics because they have excellent mechanical strength, heat resistance, chemical resistance, electrical properties and the like in a well-balanced manner. In particular, most of the liquid crystalline resin is used for injection molding.

  Liquid crystalline resin filled with fibrous reinforcing material typified by glass fiber or carbon fiber or inorganic powder such as silica, mica, clay, glass beads, etc. in liquid crystalline resin has fluidity and mechanical strength. Since the balance is good, it is a material suitable for an electric / electronic component having a thin portion or a complicated shape. For example, it is used for sealing parts such as relay parts, coil bobbins, connectors, volume parts, motor parts such as commutators and separators, or elements such as coils, crystal resonators and IC chips.

  A liquid crystalline resin composition comprising two or more types of glass fibers as a liquid crystalline resin composition having excellent mechanical properties of a thin-walled portion containing an inorganic filler such as glass fiber as described above and excellent in dimensional stability and heat resistance. Is disclosed (Patent Document 1).

  It is also known that glass beads, which are one of inorganic fillers, are blended in a liquid crystalline resin composition for the same purpose as glass fibers. What is known as a liquid crystal polymer blended with inorganic fillers such as glass fiber has improved the heat resistance, mechanical strength, and anisotropy of the liquid crystal polymer to some extent, but fluidity and dimensional accuracy during molding. The appearance of the molded product was not always sufficient. Then, the liquid crystalline resin composition which consists of 100 mass parts of liquid crystalline resin and 5 mass parts of glass beads to 200 mass parts is disclosed (patent document 2).

  By the way, most of the molded products made of the liquid crystalline resin composition as described in the above patent document are molded by injection molding. This is because the injection molding method can easily mold even a resin molded product having a complicated shape.

JP 2008-13702 A Japanese Patent Laid-Open No. 08-325446

  The liquid crystalline resin has a characteristic that the viscosity is low, but the liquid crystalline resin composition melted due to the low viscosity flows back through the backflow prevention valve provided at the tip of the screw, and the measurement time may not be stable. It is a problem.

  Also, in normal injection molding, the resin material introduced from the hopper is sent to the front of the screw while being melted by the rotation of the screw, but many resin materials containing liquid crystalline resin have a high melting point, and the resin material smoothly Are not melted, and the resin materials are welded together, resulting in a problem that the measurement time becomes long.

  Furthermore, in a liquid crystalline resin material having a high melting point and a low viscosity, the molten resin material cannot be smoothly fed to the front part of the screw due to the rotation of the screw, and the molten resin material embeds air in the front part of the screw. There is a problem of being sent. This is because if the molten resin material is fed to the front part of the screw while embracing the air, the filling density is reduced by the amount of the embraced air and the quality of the molded product varies.

  Also, a small amount of molten resin is left at the tip of the screw at the time of injection in order to effectively maintain the holding pressure. The amount of resin remaining at the tip is referred to as a cushion amount, but if the amount of cushion varies from shot to shot, a high-quality molded product cannot be stably molded. In addition, since the resin remaining at the tip is used for the next molding, if the amount of cushion increases, a lot of resin injected in the next molding will be placed at a high temperature for a long time, resulting in a decrease in physical properties of the molded product. Leads to.

  As described above, it is required to stabilize the weighing time for a short time and to stabilize the cushion amount to a small amount.However, when trying to improve the above points, other physical properties are deteriorated, and while maintaining good physical properties, The weighing time cannot be stabilized shortly and the cushion amount cannot be stabilized.

  The present invention has been made in order to solve the above-mentioned problems, and its purpose is to shorten the measurement time while maintaining good physical properties of the liquid crystalline resin composition containing glass fibers, and to provide a cushion amount. It is to provide a technology that stabilizes the amount of the material.

  The present inventors have intensively studied to solve the above problems. As a result, it has been found that the above problem can be solved by further blending 4% by mass to 7% by mass of glass beads with respect to the mixture of liquid crystalline resin and glass fiber, and the present invention has been completed. More specifically, the present invention provides the following.

  (1) A liquid crystalline resin composition for injection molding, comprising a liquid crystalline resin, glass fibers, and glass beads, wherein a blending amount of the glass beads is 4% by mass to 7% by mass.

  (2) The liquid crystalline resin composition for injection molding according to (1), wherein the glass fiber is blended in an amount of 20% by mass to 40% by mass in the total amount of the liquid crystalline resin composition for injection molding.

(3) The liquid crystalline resin has a melting point of 320 ° C. or higher, and a viscosity at a shear rate of 1000 sec ⁻¹ at 380 ° C. of 55 Pa · sec or lower, according to (1) or (2) Liquid crystalline resin composition for injection molding.

(4) The melt viscosity at 380 ° C. at a shear rate of 1000 sec ⁻¹ is 35 Pa · sec or higher. The liquid crystalline resin composition for injection molding according to any one of claims 1 to 3 is molded, and ISO 75-1 , 2, a molded article having a deflection temperature under load at 1.8 MPa measured by a method according to 2 is 300 ° C. or higher.

  According to the present invention, in the liquid crystalline resin composition for injection molding containing a liquid crystalline resin, glass fibers, and glass beads, the glass beads are blended in an amount of 4% by mass to 7% by mass. While maintaining good physical properties of the liquid crystalline resin composition containing glass fiber, the measurement time can be shortened and stabilized, and the cushion amount can be reduced and stabilized.

  Hereinafter, an embodiment of the present invention will be described in detail. However, the present invention is not limited to the following embodiment, and may be implemented with appropriate modifications within the scope of the object of the present invention. it can.

  The present invention is characterized in that 4 to 7% by weight of glass beads are blended in a liquid crystalline resin composition for injection molding containing a liquid crystalline resin, glass fibers, and glass beads.

<Liquid crystal resin composition>
The liquid crystalline resin composition used in the present invention includes a liquid crystalline resin, glass fibers, and glass beads. Hereinafter, the liquid crystalline resin composition will be described in the order of liquid crystalline resin, glass fiber, and glass beads.

[Liquid crystal resin]
The liquid crystalline resin used in the present invention refers to a melt processable polymer having a property capable of forming an optically anisotropic molten phase. The property of the anisotropic molten phase can be confirmed by a conventional polarization inspection method using an orthogonal polarizer. More specifically, the anisotropic molten phase can be confirmed by using a Leitz polarizing microscope and observing a molten sample placed on a Leitz hot stage under a nitrogen atmosphere at a magnification of 40 times. When the liquid crystalline resin applicable to the present invention is inspected between crossed polarizers, the polarized light is normally transmitted even in a molten stationary state, and optically anisotropic.

  The liquid crystalline resin as described above is not particularly limited, but is preferably an aromatic polyester or an aromatic polyester amide, and a polyester partially including an aromatic polyester or an aromatic polyester amide in the same molecular chain is also within the range. It is in. They preferably have a logarithmic viscosity (IV) of at least about 2.0 dl / g, more preferably 2.0-10.0 dl / g when dissolved in pentafluorophenol at 60 ° C. at a concentration of 0.1% by weight. .) Are used.

  The aromatic polyester or aromatic polyester amide as the liquid crystalline resin applicable to the present invention is particularly preferably at least one compound selected from the group of aromatic hydroxycarboxylic acids, aromatic hydroxyamines, and aromatic diamines. Aromatic polyesters and aromatic polyester amides as constituent components.

More specifically,
(1) A polyester mainly composed of one or more aromatic hydroxycarboxylic acids and derivatives thereof;
(2) mainly (a) one or more of aromatic hydroxycarboxylic acids and derivatives thereof; and (b) one or more of aromatic dicarboxylic acids, alicyclic dicarboxylic acids and derivatives thereof; c) Polyester comprising at least one or more of aromatic diol, alicyclic diol, aliphatic diol and derivatives thereof;
(3) mainly (a) one or more aromatic hydroxycarboxylic acids and derivatives thereof; (b) one or more aromatic hydroxyamines, aromatic diamines and derivatives thereof; and (c). A polyesteramide comprising one or more of aromatic dicarboxylic acid, alicyclic dicarboxylic acid and derivatives thereof;
(4) mainly (a) one or more aromatic hydroxycarboxylic acids and derivatives thereof; (b) one or more aromatic hydroxyamines, aromatic diamines and derivatives thereof; and (c). One or more of aromatic dicarboxylic acid, alicyclic dicarboxylic acid and derivatives thereof; and (d) at least one or more of aromatic diol, alicyclic diol, aliphatic diol and derivatives thereof, and And polyester amides composed of Furthermore, you may use a molecular weight modifier together with said structural component as needed.

（Ｘ：アルキレン（Ｃ１〜Ｃ４）、アルキリデン、−Ｏ−、−ＳＯ−、−ＳＯ_２−、−Ｓ−、−ＣＯ−より選ばれる基である。）

（Ｙ：−（ＣＨ_２）_ｎ−（ｎ＝１〜４）、−Ｏ（ＣＨ_２）_ｎＯ−（ｎ＝１〜４）より選ばれる基である。）Preferable examples of specific compounds constituting the liquid crystalline resin applicable to the present invention include p-hydroxybenzoic acid, aromatic hydroxycarboxylic acids such as 6-hydroxy-2-naphthoic acid, 2,6-dihydroxynaphthalene, 1,4-dihydroxynaphthalene, 4,4′-dihydroxybiphenyl, hydroquinone, resorcin, aromatic diols such as compounds represented by the following general formula (I) and the following general formula (II); terephthalic acid, isophthalic acid, 4 , 4′-diphenyldicarboxylic acid, 2,6-naphthalenedicarboxylic acid and aromatic dicarboxylic acids such as compounds represented by the following general formula (III); aromatic amines such as p-aminophenol and p-phenylenediamine Can be mentioned.

(X is a group selected from alkylene (C1 to C4), alkylidene, —O—, —SO—, —SO ₂ —, —S—, and —CO—.)

(Y is a group selected from — (CH ₂ ) _n — (n = 1 to 4) and —O (CH ₂ ) _n O— (n = 1 to 4).

  The present invention is characterized in that the weighing time is shortened and stabilized, and the cushion amount is shortened and stabilized. When a liquid crystalline resin having a high melting point is used, resin materials such as resin pellets tend not to be smoothly fed to the screw front. This is because resin pellets containing a liquid crystalline resin having a high melting point are not easily melted, and the pellets are welded together to be clogged, resulting in a long measurement time. The melting point of the liquid crystalline resin in which the above problem is likely to occur is 320 ° C. or higher. By blending a specific amount of glass beads in the liquid crystalline resin composition as in the present invention, even if it is a resin material containing a liquid crystalline resin having a melting point or higher, the resin material can be smoothly fed to the screw front. The weighing time can be shortened and stabilized.

  In addition, when a low-viscosity liquid crystalline resin is used, the molten resin sent to the front part of the screw tends to pass back through the backflow prevention valve, and the cushion amount tends to be unstable. The viscosity of the liquid crystalline resin in which such a problem is likely to occur is 55 Pa · sec or less. By blending a specific amount of glass beads with the liquid crystalline resin composition as in the present invention, even if the liquid crystalline resin has the above viscosity, the back flow of the molten resin and the instability of the cushion amount are easy. Can be resolved.

[Glass fiber]
As glass fiber contained in the liquid crystalline resin composition of the present invention, fiber length, fiber diameter and the like are not particularly limited, and conventionally known ones can be used. The fiber length and fiber diameter of the glass fiber are appropriately changed according to the desired physical properties.

  When chopped strand glass fibers or middle fibers having a fiber diameter of 5 to 15 μm and a fiber length of 3 mm are used, the glass fibers usually have a weight-average fiber length of 50 to 700 μm, and the liquid crystalline resin material containing the glass fibers is resin pellets or the like When used as a raw material, the measuring time tends to be long, the measuring time becomes unstable, and the cushion amount tends to become unstable. By blending a specific amount of glass beads into a mixture of liquid crystalline resin and glass fiber as in the present invention to form a liquid crystalline resin composition, the problem of the liquid crystalline resin material containing glass fibers as described above can be easily obtained. Can be resolved.

  The content of the glass fiber contained in the liquid crystalline resin composition is not particularly limited. However, if the liquid crystalline resin composition contains 20% by mass to 40% by mass, the measurement time becomes long or the measurement time becomes unstable. Or the amount of cushioning becomes unstable. In addition, a molded product obtained by molding a liquid crystalline resin composition having a glass fiber content of 20% by mass to 40% by mass has various properties such as mechanical properties in a well-balanced manner and is used in various applications. For this reason, improvement in measurement time and the like has been demanded, but the above problem can be easily solved by blending a specific amount of glass beads.

[Glass beads]
The liquid crystalline resin composition of the present invention is characterized in that it contains 4 to 7% by mass of glass beads with respect to 100% by mass of the total composition. By including glass beads in the above-mentioned range in the liquid crystalline resin composition, the measurement time is stabilized short and the cushion amount is stabilized while maintaining the good physical properties of the liquid crystalline resin composition containing glass fibers. Can do. If the content of the glass beads is less than 4% by mass, the measurement time and the cushion amount vary greatly, such being undesirable. On the other hand, if the glass bead content is more than 7% by mass, problems such as deterioration of moldability due to an increase in melt viscosity and deterioration of physical properties of a molded product formed by molding a liquid crystalline resin composition are not preferable. Preferably, the melt viscosity at 380 ° C. and a shear rate of 1000 sec ⁻¹ is 55 Pa · s or less.

  The average particle size of the glass beads is not particularly limited, but is preferably 5 μm to 30 μm. The average particle diameter of the glass beads is usually 5 μm or more, and the average particle diameter of the glass beads is preferably 30 μm or less from the viewpoint of thin-wall fluidity.

[Liquid Crystalline Resin Composition]
The liquid crystalline resin composition of the present invention contains the above-described liquid crystalline resin, glass fibers, and glass beads. A glass fiber is contained by making it into the liquid crystalline resin composition which mix | blended 4 mass%-7 mass% with respect to 100 mass% of composition whole glass beads with respect to the mixture containing liquid crystalline resin and glass fiber. While maintaining good physical properties of the liquid crystalline resin composition, the measurement time can be shortened and stabilized, and the cushion amount can be reduced and stabilized.

The effect as described above can be obtained because the temperature range from the softening of the liquid crystalline resin composition to the melting of the liquid crystalline resin composition is reduced by blending the glass beads. A preferable melt viscosity as an “appropriate melt viscosity” exhibiting the above properties is a melt viscosity at a shear rate of 1000 sec ⁻¹ at 380 ° C. of 35 Pa · sec or more, more preferably 40 Pa · sec or more, and most preferably 50 Pa · sec or more.

  Various inorganic fillers are blended for the purpose of improving the physical properties of conventionally obtained molded articles. Examples of inorganic fillers that can be added to the liquid crystalline resin include glass fibers, asbestos fibers, silica fibers, silica / alumina fibers, alumina fibers, zirconia fibers, boron nitride fibers, silicon nitride fibers, and boron fibers. And inorganic fibrous materials such as potassium titanate fibers, and metal fibrous materials such as stainless steel, aluminum, titanium, copper, and brass. The granular fillers include carbon black, graphite, silica, quartz powder, glass beads, milled glass fiber, glass balloon, glass powder, calcium silicate, aluminum silicate, kaolin, talc, clay, diatomaceous earth, wollastonite, etc. Salts, iron oxide, titanium oxide, zinc oxide, antimony trioxide, oxides of metals such as alumina, carbonates of metals such as calcium carbonate and magnesium carbonate, sulfates of metals such as calcium sulfate and barium sulfate, other ferrites, Examples thereof include silicon carbide, silicon nitride, boron nitride, and various metal powders. Examples of the plate-like filler include mica, glass flakes, various metal foils and the like. The present invention can be realized by a combination of glass fibers and glass beads. In other combinations, it is presumed that the same effect as that of the present invention cannot be obtained because the temperature range from the softening to melting of the liquid crystalline resin composition is not sufficiently narrowed.

  One of the features of the present invention is that the good physical properties of the liquid crystalline resin composition containing glass fibers can be maintained as described above. “Maintaining good physical properties” preferably means that the physical properties are not lowered at all by blending glass beads. Examples of the physical properties that are likely to be lowered include mechanical properties typified by the deflection temperature under load and bending strength of a molded article formed by molding a liquid crystalline resin composition.

<Injection molding>
Using the liquid crystalline resin composition of the present invention as a material, it is molded by an injection molding method to produce a molded body. Injection molding can be divided into, for example, a weighing process, an injection process, and a pressure holding / cooling process. As a molding apparatus to be used, a conventionally known general injection molding apparatus can be used.

[Weighing process]
The weighing step is a step of plasticizing and weighing the resin. Resin pellets made of the liquid crystalline resin composition described above are transferred from the hopper side to the nozzle direction side by the rotation of the screw. And the melted liquid crystalline resin composition is stored in the screw front part.

  The conventional liquid crystalline resin composition has a low viscosity, so that the molten resin may be transported while embracing air, causing problems such as insufficient filling and warping. By blending 4 to 7% by weight of glass beads in the functional resin composition, the above-mentioned appropriate viscosity is imparted to the melted liquid crystalline resin composition and air entrapment can be prevented.

  When the molten resin is sent to the front part of the screw while embracing air as described above, the air is removed by back pressure. The “back pressure” refers to a pressure that pressurizes the resin by acting in the injection direction opposite to the reverse direction of the screw when the screw is retracted by the molten resin sent to the tip. The screw front part is provided with a backflow prevention valve so that the molten resin does not backflow, but the melted liquid crystalline resin composition usually has a problem that it slips through the backflow prevention valve because of its low viscosity. However, in the present invention, since an appropriate viscosity is imparted to the melted liquid crystalline resin composition as described above, backflow can be prevented. When injection molding is performed using the liquid crystalline resin composition of the present invention as a material, the back pressure is preferably 1 MPa to 5 MPa.

  Moreover, when the liquid crystalline resin composition is injection-molded, a plurality of resin pellets tend to be easily welded during transfer. If the groove of the screw is shallow compared with the size of the lump of the resin pellet generated by welding, the molding material cannot be transferred successfully. If the transfer becomes unsuccessful, the measurement time becomes longer, and the productivity of the injection molded product decreases. Further, since the transfer does not proceed smoothly, the difference in measurement time for each shot becomes large. It affects the quality of the injection-molded product obtained by varying the measurement time. In the present invention, by blending glass beads with a mixture of liquid crystalline resin and glass fiber so as to be 4% by mass to 7% by mass with respect to 100% by mass of the total composition, a liquid crystalline resin composition is obtained. The above problem can be solved and the weighing time can be stabilized.

  “Stable weighing time” means that the difference between the maximum weighing time and the minimum weighing time within 30 shots is within 5 seconds, in addition to the case where the weighing time is exactly the same for each shot. This is because if the variation in lightweight time is within the above range, the reduction in productivity can be sufficiently eliminated and the quality of the obtained molded product is hardly affected.

[Injection process]
The injection process is a process of extruding molten resin from a cylinder into a mold. The injection speed and injection pressure are injected at a preferred injection speed depending on the molding material used.

  After injection, a small amount of molten resin is left at the tip of the screw in order to effectively apply the holding pressure. The amount of resin remaining at the tip is called the cushion amount. When the cushion amount increases, the resin remaining at the tip is used for the next molding, so that the resin is left at a high temperature for a long time, leading to deterioration of physical properties. Further, the variation in the cushion amount affects the quality of the molded product. By using the liquid crystalline resin composition of the present invention, the variation in the cushion amount can be suppressed to 1.0 mm or less while keeping other physical properties good. Note that the variation in the preferable cushion amount indicates a difference between the maximum value and the minimum value measured for 30 shots.

[Pressure holding and cooling process]
The pressure-holding step is a step in which pressurization from the injection molding machine to the resin in the mold is continued from the injection step to the beginning of the cooling step to compensate for the shrinkage resin accompanying cooling. In particular, when the liquid crystalline resin composition of the present invention is used, the holding pressure can be effectively applied because the cushion amount is stable as described above.

  In injection molding, the resin is weighed by retracting the screw while cooling the resin in the mold in the cooling process in order to increase the productivity of the molded product. If the resin takes a long time for cooling, even if the measurement time is somewhat long, the effect on the productivity is small. However, since the liquid crystalline resin has a short cooling time, it is necessary to stabilize the measurement time. The measurement time can be stabilized by using the liquid crystalline resin composition of the present invention.

  Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

<Material>
Liquid crystalline resin: Vectra T950 (manufactured by Polyplastics) melt viscosity 48 Pa · sec
Chopped strand glass fiber: ECS03T-786H (manufactured by Nippon Electric Glass Co., Ltd.) Fiber diameter 10 μm, fiber length 3 mm
Glass beads: EGB731 (Potters Barotini) average particle size 18 μm
Spherical silica: SC2000-ZD (manufactured by Admatechs) average particle size 0.55 μm
Talc: Crown talc PP (manufactured by Matsumura Sangyo Co., Ltd.) Average particle size 2.3 μm

<Example>
After dry blending the materials shown in Table 1 at the ratio shown in Table 1, kneaded pellets were prepared using a twin screw extruder (“TEX30α type” manufactured by Nippon Steel Works). The following evaluation was performed using the liquid crystalline resin composition of this Example.

[Measurement of melt viscosity]
The apparent melt viscosity under the conditions of a temperature of 380 ° C. and a shear rate of 1000 sec ⁻¹ was measured according to ISO 11443 using a capillary rheometer (“Capillograph 1B: piston diameter 10 mm” manufactured by Toyo Seiki Co., Ltd.). For the measurement, an orifice having an inner diameter of 1 mm and a length of 20 mm was used. The measurement results are shown in Table 1.

[Measurement of deflection temperature under load]
Using the kneaded pellets and the molding machine (manufactured by Sumitomo Heavy Industries, Ltd., “SE100DU”), test specimens (4 mm × 10 mm × 80 mm) were molded under the following molding conditions. Thereafter, the deflection temperature under load was measured by a method based on ISO 75-1,2. Table 1 shows the measurement results of the deflection temperature under load.
(Molding condition)
Cylinder temperature: 380 ° C
Mold temperature: 90 ℃
Back pressure: 1.0 MPa
Injection speed: 33m / sec

[Measuring stability]
Using the kneaded pellets and molding machine of the examples (manufactured by Nippon Steel, “J110-AD molding machine (screw diameter Φ35)”), flat plate test pieces of 80 mm × 80 mm × 5 t (measuring stroke 50 mm) under the following molding conditions The variation of the weighing time and the cushion amount when molding was measured. 30 shots were performed, and the average weighing time, the average cushion amount, the difference between the maximum weighing time and the minimum weighing time, and the difference between the maximum value and the minimum value of the deviation from the reference weighing position were calculated. The results are shown in Table 1.
(Molding condition)
Cylinder temperature: 380 ° C
Mold temperature: 80 ℃
Screw rotation speed: 220rpm
Back pressure: 4MPa

[Bending strength]
Using a test piece similar to the test piece used to measure the deflection temperature under load, the bending strength was measured by a method based on ISO178. The measurement results are shown in Table 1.

<Comparative example>
After dry blending the materials shown in Table 1 at the ratio shown in Table 1, kneaded pellets were produced in the same manner as in Example 1. Using the kneaded pellets of this comparative example, the melt viscosity, the deflection temperature under load, the measurement stability and the like were evaluated in the same manner as in the examples. The evaluation results are shown in Table 1.

  As is apparent from Table 1, in Examples 1 and 2 in which the blending amount of the glass beads is in the range of 4% by mass to 7% by mass in the total composition, the melt viscosity of the liquid crystalline resin composition is 35 Pa · sec or more. The average weighing time is as short as 12 seconds or less, and the variation in weighing time is as little as 4 seconds, even though there is no decrease in the deflection temperature under load. Further, the cushion amount is not so large as 3.4 mm or less, and the variation in the cushion amount is as small as 0.4 seconds or less. In Comparative Example 1 in which no glass beads are blended, the measurement time is long, the variation is large, and the variation of the cushion amount is also large. On the other hand, when the blending amount of the glass beads exceeds 7% by mass, as is clear from Comparative Examples 3 and 4, the melt viscosity deteriorates, the deflection temperature under load begins to decrease, and physical properties are deteriorated.

  As is clear from the results of Example 2 and Comparative Examples 5 and 6, Comparative Example 5 using spherical silica instead of glass beads, and Comparative Example 6 using talc, have an average light weight time compared to Example 2. It was confirmed that there was a large variation in the average cushion amount.

  From the above results, the glass fiber was further blended with respect to the liquid crystalline resin composition containing glass fiber so that the glass beads were 4% to 7% by mass with respect to 100% by mass of the total composition. It was confirmed that the measurement time can be shortened and the cushion amount can be reduced and stabilized while maintaining the good physical properties of the liquid crystalline resin composition.

Claims (3)

Including liquid crystalline resin, glass fiber, and glass beads,
The amount of glass beads, Ri 7% by mass of 4% by weight relative to the liquid-crystalline resin composition the total amount of 100 wt% for injection molding,
A liquid crystalline resin composition for injection molding, wherein the glass fiber is blended in an amount of 20% by mass to 40% by mass in the total amount of the liquid crystalline resin composition for injection molding. 2. The liquid crystalline resin composition for injection molding according to claim 1, wherein the liquid crystalline resin has a melting point of 320 ° C. or more and a viscosity at a shear rate of 1000 sec ⁻¹ at 380 ° C. of 55 Pa · sec or less. object. The melt viscosity at 380 ° C. at a shear rate of 1000 sec ⁻¹ is 35 Pa · sec or more, formed by molding the liquid crystalline resin composition for injection molding according to claim 1 or 2 ,
A molded article having a deflection temperature under load at 1.8 MPa measured by a method according to ISO 75-1 or 2 is 300 ° C. or higher.