JPH07316403A - Thermotropic liquid-crystal polymer particle mixture and method of molding by using it - Google Patents

Abstract

PURPOSE:To obtain the title mixture which does not contaminate a dryer in thermal drying and permits stable plasticization of the polymer. CONSTITUTION:This mixture is obtained by covering the surface of 100 pts.wt. thermotropic liquid-crystal polymer particles with 0.001-5 pts.wt. metal salt of a higher fatty acid, which produces at most 4wt.% volatile matter when heat treated at 150 deg.C for 4hr, or mixture of the salt and a higher fatty acid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermotropic liquid crystal polymer particle mixture capable of stably plasticizing without contaminating a dryer upon heating and drying, and a molding method using the same.

[0002]

2. Description of the Related Art In order to stably plasticize a thermotropic liquid crystal polymer, in JP-A-5-125258, the thermotropic liquid crystal polyester particles are dried for 30 minutes by a heating dryer at 120 ° C. and then stearic acid is added. It has been proposed to add a mixture of Calcium stearate and Calcium stearate and then feed the mixture to an injection molding machine for molding. It is said that calcium stearate exhibits a more effective plasticizing and stabilizing effect when combined with stearic acid than when used alone. Since the thermotropic liquid crystal polymer has a high melting point and therefore the molding temperature is high, it is easily affected by moisture during molding, so drying must be performed for a long time, especially when using the thermotropic liquid crystal polyester that has been stored, it usually takes several hours. Need to be dried. However, the mixture of stearic acid and calcium stearate has a large amount of volatile components when it is heated and dried for a long time, for example, 4 hours or more due to the contained stearic acid, and there is a concern that it may contaminate the heating dryer. In addition, there is a concern that the plasticizing and stabilizing effect will decrease due to the volatilization of stearic acid. Further, since calcium stearate has a too high melting point, even if it is mixed with thermotropic liquid crystal polymer particles and dried by heating, the powder does not melt at the temperature of heating and drying. Therefore, after drying, the coexisting stearic acid appears to be attached in a film or layer due to melting, but when observed in detail, the powder of calcium stearate is essentially in a state of simply adhering to the resin particles. I understand. Therefore, the plasticizing and stabilizing effect is not always as large as expected.

[0003]

In view of the above circumstances, the present invention provides a thermotropic liquid crystal polymer particle which does not contaminate a dryer during heating and drying and which is excellent in plasticizing and stabilizing effect, and the same. It is an object of the present invention to provide a molding method using.

[0004]

The first aspect of the present invention is 100
Parts by weight of the thermotropic liquid crystal polymer particles,
Volatile content of 4% by weight when heated at 150 ° C for 4 hours
It is intended to provide a thermotropic liquid crystal polymer particle mixture obtained by coating with 0.001 to 5 parts by weight of the following higher fatty acid metal salt or a mixture of a higher fatty acid metal salt and a higher fatty acid. The second aspect of the present invention is to provide a thermotropic liquid crystal polymer particle mixture in which the higher fatty acid metal salt is calcium montanate. A third aspect of the present invention is 100 parts by weight of thermotropic liquid crystal polymer particles and a higher fatty acid metal salt or a higher fatty acid metal salt and a higher fatty acid having a volatile content of 4% by weight or less when heat-treated at 150 ° C. for 4 hours. A thermotropic liquid crystal polymer particle mixture consisting of 0.001 to 5 parts by weight of a mixture of
Heat drying in the temperature range of 110 to 150 ° C. for 4 hours or more,
The present invention also provides a method for molding a thermotropic liquid crystal polymer, which comprises supplying the particle mixture to a molding machine and molding the mixture. A fourth aspect of the present invention is to provide a method for molding a thermotropic liquid crystal polymer in which the melting point of the higher fatty acid metal salt and the higher fatty acid is the heating drying temperature or lower. A fifth aspect of the present invention provides a method for molding a thermotropic liquid crystal polymer, wherein the higher fatty acid metal salt is calcium montanate.

The present invention will be described in more detail below. The higher fatty acid metal salt or the mixture of the higher fatty acid metal salt and the higher fatty acid used in the present invention has a volatile content of 4% by weight or less, preferably 3% by weight, when heat-treated at 150 ° C. for 4 hours.
It is the following. In the measurement of volatile matter, higher fatty acid metal salt or a mixture of higher fatty acid metal salt and higher fatty acid 10
Gram is placed on a plate and heated in an air oven under the above conditions to determine the weight change before and after. Volatile content is 4% by weight
When it is larger than the above range, the plasticizing stabilizing effect becomes low, and at the same time, the dryer may be contaminated during drying before molding, which is not preferable.

The metal constituting the above higher fatty acid metal salt is
A metal of Group IA, IB or IIA, IIB in the periodic table, particularly an alkaline earth metal, is preferable, and specifically calcium. The higher fatty acid metal salt may be used in combination with a higher fatty acid. The higher fatty acid may be an acid that constitutes a higher fatty acid metal salt, or may be another higher fatty acid. The blending amount of the higher fatty acid is 1 or less with respect to 1 higher fatty acid metal salt by weight. When a mixture of higher fatty acid is used, the mixture of the higher fatty acid metal salt and the higher fatty acid is 150
It is necessary that the volatile content when heat-treated at 4 ° C. for 4 hours is 4% by weight or less. Further, the melting points of the higher fatty acid metal salt and the higher fatty acid are preferably equal to or lower than the heat drying temperature. When the melting point is at or below the heating and drying temperature, it melts during heating and drying to form a film and effectively adheres to the surface of the resin particles. This further increases the plasticizing and stabilizing effect.

As the higher fatty acid metal salt, calcium montanate is particularly preferable. Calcium montanate is produced from an inorganic wax containing a large amount of ester and free acid obtained by distilling or solvent extracting natural asphalt brown coal. Although calcium montanate has a relatively low melting point of 123 ° C. as compared with calcium stearate, it has a low volatile content when heat-treated at 150 ° C. for 4 hours, so that a film or layer effectively composed of calcium montanate is used. It is preferable because it forms and adheres to the resin. Further, as the higher fatty acid to be added to calcium montanate, montanic acid is preferable for the same reason. Since the volatile components and melting points of calcium montanate and montanic acid can be changed depending on the degree of purification, those which satisfy the above conditions are appropriately selected.

The thermotropic liquid crystal polymer referred to in the present invention is a polymer which exhibits optical anisotropy when melted and has thermoplasticity. As described above, the polymer exhibiting optical anisotropy when melted has a property that the polymer molecular chains have a regular parallel arrangement in the melted state. The properties of the optically anisotropic molten phase can be confirmed by a usual polarization inspection method using a crossed polarizer. Examples of the liquid crystal polymer, for example, liquid crystalline polyester, liquid crystalline polycarbonate,
Liquid crystalline polyester imides and the like, specifically, (all) aromatic polyesters, polyester amides, polyamide imides, polyester carbonates, polyazomethine and the like can be mentioned. Thermotropic liquid crystal polymers are generally elongated and have a flat molecular structure, and have high rigidity along the long chain of the molecule. In the thermotropic liquid crystal polymer used in the present invention, a part of one polymer chain is composed of a polymer segment forming an anisotropic melt phase, and the remaining part is a polymer segment not forming an anisotropic melt phase. Polymers composed of are also included. Further, it also includes a composite of a plurality of thermotropic liquid crystal polymers.

Typical examples of the monomer constituting the thermotropic liquid crystal polymer include (A) at least one aromatic dicarboxylic acid, (B) at least one aromatic hydroxycarboxylic acid compound, and (C) aromatic diol. At least one compound, (D) (D ₁ ) aromatic dithiol, (D ₂ ) aromatic thiophenol, (D ₃ ) at least one aromatic thiolcarboxylic acid compound, (E) aromatic hydroxylamine, aromatic An aromatic compound such as at least one kind of group diamine-based compound can be used. These may be used alone, but in many cases (A) and (C);
(A) and (D); (A), (B) and (C); (A),
(B) and (E); or (A), (B), (C) and (E), and the like.

Examples of the aromatic dicarboxylic acid compound (A) include terephthalic acid, 4,4'-diphenyldicarboxylic acid, 4,4'-triphenyldicarboxylic acid, 2,6-naphthalenedicarboxylic acid and 1,4- Naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, diphenyl ether-4,4'-dicarboxylic acid, diphenoxyethane-
4,4'-dicarboxylic acid, diphenoxybutane-4,4'-
Dicarboxylic acid, diphenylethane-4,4'-dicarboxylic acid, isophthalic acid, diphenyl ether-3,3'-dicarboxylic acid, diphenoxyethane-3,3'-dicarboxylic acid, diphenylethane-3,3'-dicarboxylic acid, 1,6
-Aromatic dicarboxylic acids such as naphthalenedicarboxylic acid, or chloroterephthalic acid, dichloroterephthalic acid, bromoterephthalic acid, methylterephthalic acid, dimethylterephthalic acid, ethylterephthalic acid, methoxyterephthalic acid,
Examples thereof include alkyl, alkoxy or halogen substitution products of the above aromatic dicarboxylic acids represented by ethoxyterephthalic acid and the like.

Examples of the aromatic hydroxycarboxylic acid compound (B) include aromatic hydroxy such as 4-hydroxybenzoic acid, 3-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid and 6-hydroxy-1-naphthoic acid. Carboxylic acid, or 3-methyl-4-hydroxybenzoic acid, 3,
5-Dimethyl-4-hydroxybenzoic acid, 2,6-dimethyl-4-hydroxybenzoic acid, 3-methoxy-4-hydroxybenzoic acid, 3,5-dimethoxy-4-hydroxybenzoic acid, 6-hydroxy-5- Methyl-2-naphthoic acid, 6-hydroxy-5-methoxy-2-naphthoic acid, 2-chloro-4-hydroxybenzoic acid, 3-chloro-4-hydroxybenzoic acid, 2,3-dichloro-4-hydroxybenzoic acid Acid, 3,5-dichloro-4-hydroxybenzoic acid, 2,5-dichloro-4-hydroxybenzoic acid, 3-bromo-4-hydroxybenzoic acid, 6-hydroxy-5-chloro-2-naphthoic acid, 6 -Hydroxy-
7-chloro-2-naphthoic acid, 6-hydroxy-5,7
-Alkyl, alkoxy or halogen substitution products of aromatic hydroxycarboxylic acid such as dichloro-2-naphthoic acid.

As the (C) aromatic diol, 4,4'-
Dihydroxydiphenyl, 3,3'-dihydroxydiphenyl, 4,4'-dihydroxytriphenyl, hydroquinone, resorcin, 2,6-naphthalenediol, 4,
4'-dihydroxydiphenyl ether, bis (4-hydroxyphenoxy) ethane, 3,3'-dihydroxydiphenyl ether, 1,6-naphthalenediol, 2,2-
Aromatic diols such as bis (4-hydroxyphenyl) propane and bis (4-hydroxyphenyl) methane, or chlorohydroquinone, methylhydroquinone, tert-
Butylhydroquinone, phenylhydroquinone, methoxyhydroquinone, phenoxyhydroquinone, 4-
Examples thereof include alkyl, alkoxy or halogen-substituted aromatic diols such as chlororesorcin and 4-methylresorcin.

Examples of (D ₁ ) aromatic dithiol include benzene-1,4-dithiol, benzene-1,3-dithiol, 2,6-naphthalene-dithiol, and 2,7-naphthalene-dithiol. Examples of (D ₂ ) aromatic thiophenol include 4-mercaptophenol, 3-mercaptophenol, and 6-mercaptophenol. Examples of (D ₃ ) aromatic thiol carboxylic acid include 4-mercaptobenzoic acid, 3-mercaptobenzoic acid, 6-mercapto-2-naphthoic acid and 7-mercapto-2-naphthoic acid.

(E) Aromatic hydroxylamine and aromatic diamine compounds include 4-aminophenol and N
-Methyl-4-aminophenol, 1,4-phenylenediamine, N-methyl-1,4-phenylenediamine,
N, N'-dimethyl-1,4-phenylenediamine, 3-
Aminophenol, 3-methyl-4-aminophen-
2-chloro-4-aminophenol, 4-amino-
1-naphthol, 4-amino-4'-hydroxydiphenyl, 4-amino-4'-hydroxydiphenyl ether, 4-amino-4'-hydroxydiphenylmethane,
4-amino-4′-hydroxydiphenyl sulfide,
4,4'-diaminophenyl sulfide (thiodianiline), 4,4'-diaminodiphenyl sulfone, 2,5-
Diaminotoluene, 4,4'-ethylenedianiline, 4,
4'-diaminodiphenoxyethane, 4,4'-diaminodiphenylmethane (methylenedianiline), 4,4'-diaminodiphenylether (oxydianiline) and the like can be mentioned.

The thermotropic liquid crystal polymer used in the present invention can be produced from the above-mentioned monomers by various ester forming methods such as a melt acidolysis method and a slurry polymerization method. Among the thermotropic liquid crystal polymers obtained from these monomers, wholly aromatic polyesters which are (co) polymers containing the monomer unit represented by the general formula 1 are preferable.

[0016]

[Chemical 1]

A particularly preferred wholly aromatic polyester of the present invention is a polyester represented by Chemical formula 2 having repeating units derived from three compounds of p-hydroxybenzoic acid, phthalic acid and biphenol, or p-
It is a polyester represented by Chemical formula 3 having repeating units derived from two compounds of hydroxybenzoic acid and hydroxynaphthoic acid.

[0018]

[Chemical 2]

[Chemical 3]

The thermotropic liquid crystal polymer particles in the present invention mean those having an arbitrary shape and size which can be supplied to a molding machine. Usually, the material is supplied to a molding machine such as an extrusion molding machine or an injection molding machine in the form of granulated particles having a certain size (pellets). Particles granulated by an appropriate granulator of are preferable. Usually particle size is 1-10m
Although the particles are in the range of m, a powder smaller than this can be used depending on the type of molding machine.

The thermotropic liquid crystal polymer particles may be the thermotropic liquid crystal polymer alone, but preferably those containing an inorganic or organic filler. Usually, the content of the inorganic or organic filler is 90 parts by weight or less, preferably 10 to 80 parts by weight, and more preferably 20 to 60 parts by weight per 100 parts by weight of the thermotropic liquid crystal polymer. The method for producing thermotropic liquid crystal polymer particles in which an inorganic or organic filler is blended is not particularly limited, but a powder or pelletized polymer and an inorganic or organic filler (in many cases powder) are added to an ordinary extruder. And can be easily manufactured. Of the inorganic or organic fillers, the inorganic fillers are particularly important and are often used to improve the processability of thermotropic liquid crystal polymers and the physical properties of molded articles. As the inorganic filler, conventionally known molybdenum disulfide, talc, mica, clay, sericite, calcium carbonate, calcium silicate, silica, alumina, aluminum hydroxide, calcium hydroxide, graphite, amorphous carbon, potassium titanate. ,
Examples thereof include glass fiber, carbon fiber, various whiskers and the like.

In the present invention, various additives other than the inorganic or organic filler can be added to the polymer in order to improve the physical properties in practical use. In this case as well, these various additives are added together with the filler. It is preferable that the polymer particles prepared by previously mixing the agent in the polymer are used for mixing. Examples of such additives include conventionally known stabilizers, antioxidants, ultraviolet absorbers, pigments, dyes and modifiers.

Within the scope of the object of the present invention, thermotropic liquid crystal polymer may be added to other thermoplastic resin such as polyolefin, polyvinyl chloride, polyvinylidene chloride, polyamide resin, polyphenylene sulfide resin, polysulfone resin, and the like. May use thermotropic liquid crystal polymer particles blended with an elastomer such as natural rubber or synthetic rubber. These resins are not essential components in the present invention, but the type and amount thereof can be appropriately selected according to the purpose.

The amount of the higher fatty acid metal salt or the mixture of the higher fatty acid metal salt and the higher fatty acid (hereinafter abbreviated as “higher fatty acid metal salt”) used in the present invention is 100 parts by weight of thermotropic liquid crystal polymer particles. 0.001-
5 parts by weight. If it is less than 0.001 part by weight, a sufficient effect cannot be obtained. On the other hand, if it exceeds 5 parts by weight, the mechanical strength of the obtained molded article is lowered and the hue of the molded article is deteriorated when exposed to high temperature.

When the higher fatty acid metal salt and the higher fatty acid are used in combination, the higher fatty acid metal salt obtained as a partially neutralized product of the higher fatty acid, as long as the ratio of the higher fatty acid metal salt and the higher fatty acid is appropriate. And mixtures of higher fatty acids can be utilized. The higher fatty acid metal salt, the mixture of the higher fatty acid metal salt and the higher fatty acid, and the mixture of the higher fatty acid metal salt and the higher fatty acid as a partially neutralized product of the higher fatty acid are all powdered products that are commercially available products. It can be used as appropriate. Granules or agglomerates are appropriately crushed before being mixed.

The method for mixing the thermotropic liquid crystal polymer particle mixture in the present invention is not particularly limited, and the powdery higher fatty acid metal salt and the thermotropic liquid crystal polymer particles are mixed using an arbitrary stirrer such as a tumbler mixer or a Henschel mixer. It can be performed by any method.
The temperature condition for mixing is not particularly limited, and may be a level that utilizes frictional heat during mixing. Usually, it is sufficient to stir and mix at a temperature at which the higher fatty acid metal salt or the like does not melt. Since the thermotropic liquid crystal polymer has extremely high heat resistance, it does not substantially soften in the above mixing. The mixing time is not particularly limited and may be any time sufficient for forming a uniform mixture of the polymer particles and the higher fatty acid metal salt.

When the thermotropic liquid crystal polymer contains water in an amount exceeding the permissible amount due to storage or the like, it is necessary to perform drying for removing water before molding such as injection molding. Not only powdery thermotropic liquid crystal polymers, but also pelletized polymers. When the polymer particles are blended with a filler, they need to be dried especially if the filler contained therein is hygroscopic. Therefore, the thermotropic liquid crystal polymer particles to which the higher fatty acid metal salt or the like is attached before molding are dried by heating in the temperature range of 110 to 150 ° C. and then supplied to a molding machine for molding. If the drying temperature exceeds 150 ° C, the resin deteriorates, while if the drying temperature is less than 110 ° C, the drying is insufficient, which is not preferable. The time required for drying should be sufficiently long for stored resin etc.,
Therefore, it should be 4 hours or more. Usually, it is carried out for 4 to 10 hours. Whether or not the drying is sufficient can be confirmed by inspecting the molded product for the occurrence of blisters. It may be supplied to the molding machine immediately after drying, or may be used after being stored in an appropriate storage tank for a certain period of time. Needless to say, the storage tank in this case has a closed structure, or is sealed with an inert gas such as dry air or nitrogen to prevent the intrusion of water. The resin particles of the present invention are preferable because they do not contaminate the dryer even when they are heated and dried.

In the step of conveying the liquid crystal polymer particles to the extruder of the molding machine and plasticizing, there is a problem that the plasticization is difficult to stabilize. In order to solve this, the thermotropic liquid crystal polymer particle mixture is not a mere mixture of liquid crystal polymer particles and powder such as higher fatty acid metal salt,
A form in which the surface of the polymer particles is coated in a layer or film form with a higher fatty acid metal salt or the like is desirable. With such a form, the higher fatty acid metal salt or the like can effectively exhibit the plasticizing and stabilizing effect. In the present invention, as described above, the higher fatty acid metal salt or the like melts during heating and drying to coat the surface of the polymer particles in a layer or film form.

Since the above-mentioned problem in molding the liquid crystal polymer is a phenomenon at the interface between the polymer and the barrel (cylinder) or the screw surface, if the supplied polymer particles are coated with a higher fatty acid metal salt or the like. ,
These metal salts act when the surface of the polymer particles melts to improve the interfacial state and solve the problem. On the other hand, when the higher fatty acid metal salt or the like is blended inside the polymer particles, only the portion existing near the surface of the particles is effectively used, and therefore, in order to exert a sufficient effect. However, a much larger amount than the case where the polymer particles are coated is required as a whole.
Therefore, problems such as a decrease in polymer strength and a decrease in heat resistance sometimes occur. In addition, higher fatty acid metal salts, etc.
The thermal stability is not always good when melt-kneading with a thermotropic liquid crystal polymer having a high melting point. Therefore, it is preferable to mold the polymer particles after previously mixing the filler, other additives and the like with the higher fatty acid metal salt or the like. As described above, other additives may be added together with the higher fatty acid metal salt, etc.,
If they are mixed in a too large amount, the effects of the present invention due to the higher fatty acid metal salt or the like may be reduced or diminished by their coexistence. Therefore, the coexisting amount of other additives is preferably suppressed to the necessary minimum amount.

The thermotropic liquid crystal polymer particle mixture of the present invention is subjected to molding such as extrusion molding and injection molding by a conventionally known method. As the molding equipment and molding conditions, those known for thermotropic liquid crystal polymer can be adopted. In any of the molding methods, the effects of the present invention are most effectively exhibited by using an extrusion molding machine, an injection molding machine or the like that utilizes a plasticizing step using a screw.
An example of such an injection molding machine is a so-called in-line screw injection molding machine. Any molding machine may be used as long as it is a molding machine using a plasticizing step using a screw, for example, a granulating machine such as a pelletizer.

[0030]

EXAMPLES The present invention will be specifically described below with reference to examples. <Examples 1 to 3> As thermotropic liquid crystal polymer, terephthalic acid, 4-hydroxybenzoic acid and 4,4'-
60% by weight of a terpolymer (melting point of 420 ° C. by DSC) consisting of dihydroxybiphenyl in a weight ratio of 1: 2: 1
Pellets (particle size: 2 to 3 mm) prepared in advance by mixing 40% by weight of crushed glass fiber and kneading with calcium montanate powder by a Henschel mixer at a ratio shown in Table 1 to obtain a polymer particle mixture. Got Next, the mixture of the calcium montanate obtained above and the polymer particles was put into a shelf-type heating dryer which was adjusted to 120 ° C. for heating and drying, and the mixture was heated for 4 hours under heating at 120 ° C. It was dried. After the drying was completed, the inside of the dryer was visually observed, but no contamination with calcium montanate was observed at any place. When the obtained particle mixture after drying was visually observed, the mixed calcium montanate was few in the form of powder before compounding, and most of it was almost uniformly formed into a film or layer on the particle surface. It was attached. The above-mentioned polymer particle mixture was supplied to a hopper of an injection molding machine equipped with a screw type extruder, and injection molding was performed into a mold through a gate according to a conventional method. The above injection molding was performed 20 times continuously, and the variation rate of the filling time into the cylinder of the injection molding machine was determined by the following formula. The results are shown in Table 1. Filling time fluctuation rate (%) = (standard deviation of filling time / average filling time) × 100 Further, the obtained molded product was exposed to a high temperature of 250 ° C. for 3 hours, but no blister was observed.

<Comparative Example 1> A 1: 1 mixture (weight ratio) of stearic acid and calcium stearate was mixed with the thermotropic liquid crystal polymer used in Examples in the same manner as in Example 1 to obtain a polymer particle mixture. . This was also put in a tray heating dryer and dried. Table 1 shows the blending amount of calcium stearate and the like, the melting point and the volatile content when heated and dried at 150 ° C. for 4 hours. Injection molding was carried out in the same manner as in the example using the dried polymer particle mixture, and the variation rate of the filling time into the cylinder of the injection molding machine was obtained. The results are shown in Table 1. As can be seen from the table, the 1: 1 mixture of stearic acid and calcium stearate has a large volatile content. Therefore, after drying for 4 hours, the inside of the dryer was visually inspected to find that the inner wall was contaminated with stearic acid. It was Further, when observed in detail, calcium stearate was adhered in the form of powder. Further, the variation rate of the filling time into the injection molding machine cylinder was also high.

Comparative Example 2 Calcium stearate was mixed with the thermotropic liquid crystal polymer used in the examples in the same manner as in the examples to obtain a polymer particle mixture. Table 1 shows the results of heat drying as described above. When observed after drying, calcium stearate was adhered in the form of powder, and the variation rate of the filling time into the cylinder of the injection molding machine was high.

Comparative Example 3 The thermotropic liquid crystal polymer used in the example was mixed with the montanic acid ester wax in the same manner as in the example to obtain a polymer particle mixture. Table 1 shows the results of heat drying as described above.
After drying, when the inside of the dryer was visually observed, contamination with ester wax was found on the inner wall of the dryer because of the large amount of volatile components. Also, the variation rate of the filling time into the injection molding machine cylinder was high.

[0034]

[Table 1]

[0035]

EFFECTS OF THE INVENTION The thermotropic liquid crystal polymer particle mixture of the present invention (1) has little volatilization even when sufficiently dried, and therefore does not contaminate the dryer, and (2) contains higher fatty acid metal salts. Since the surface of the polymer particles is coated in a layered or film-like manner almost uniformly, it has an excellent plasticizing and stabilizing effect.

Claims (5)

[Claims] 1. A higher fatty acid metal salt or a higher fatty acid metal salt and a higher fatty acid having a volatile content of 4% by weight or less when the surface of 100 parts by weight of thermotropic liquid crystal polymer particles is heat-treated at 150 ° C. for 4 hours. Mixture of 0.001
Thermotropic liquid crystal polymer particle mixture coated with ˜5 parts by weight. 2. The thermotropic liquid crystal polymer particle mixture according to claim 1, wherein the higher fatty acid metal salt is calcium montanate. 3. Thermotropic liquid crystal polymer particles 10
A thermostat composed of 0 parts by weight and 0.001 to 5 parts by weight of a higher fatty acid metal salt or a mixture of a higher fatty acid metal salt and a higher fatty acid having a volatile content of 4% by weight or less when heat-treated at 150 ° C. for 4 hours. A method for molding a thermotropic liquid crystal polymer, which comprises heating and drying the mixture of particles of the tropic liquid crystal polymer for 4 hours or more in a temperature range of 110 to 150 ° C., and then supplying the mixture of particles to a molding machine for molding. 4. The method for molding a thermotropic liquid crystal polymer according to claim 3, wherein the melting points of the higher fatty acid metal salt and the higher fatty acid are not higher than the heat drying temperature. 5. The method for molding a thermotropic liquid crystal polymer according to claim 3, wherein the higher fatty acid metal salt is calcium montanate.