WO2022215615A1 - 液晶ポリマー粒子の製造方法 - Google Patents
液晶ポリマー粒子の製造方法 Download PDFInfo
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- WO2022215615A1 WO2022215615A1 PCT/JP2022/015809 JP2022015809W WO2022215615A1 WO 2022215615 A1 WO2022215615 A1 WO 2022215615A1 JP 2022015809 W JP2022015809 W JP 2022015809W WO 2022215615 A1 WO2022215615 A1 WO 2022215615A1
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- Prior art keywords
- liquid crystal
- crystal polymer
- polymer particles
- structural unit
- mol
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Links
- 229920000106 Liquid crystal polymer Polymers 0.000 title claims abstract description 117
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 title claims abstract description 117
- 239000002245 particle Substances 0.000 title claims abstract description 110
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 230000001186 cumulative effect Effects 0.000 claims abstract description 9
- 238000010298 pulverizing process Methods 0.000 claims description 38
- 239000000203 mixture Substances 0.000 claims description 13
- -1 diol compound Chemical class 0.000 claims description 11
- KAUQJMHLAFIZDU-UHFFFAOYSA-N 6-Hydroxy-2-naphthoic acid Chemical compound C1=C(O)C=CC2=CC(C(=O)O)=CC=C21 KAUQJMHLAFIZDU-UHFFFAOYSA-N 0.000 claims description 8
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 7
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 9
- 239000000178 monomer Substances 0.000 description 19
- 239000000843 powder Substances 0.000 description 18
- 238000006116 polymerization reaction Methods 0.000 description 17
- 125000000217 alkyl group Chemical group 0.000 description 12
- 239000007789 gas Substances 0.000 description 11
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 10
- 230000001133 acceleration Effects 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 6
- 125000003545 alkoxy group Chemical group 0.000 description 6
- 125000004432 carbon atom Chemical group C* 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 6
- 150000002148 esters Chemical class 0.000 description 6
- 150000004820 halides Chemical class 0.000 description 6
- 239000000155 melt Substances 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 125000003118 aryl group Chemical group 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 125000001624 naphthyl group Chemical group 0.000 description 5
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 5
- 229920000728 polyester Polymers 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- SCVFZCLFOSHCOH-UHFFFAOYSA-M potassium acetate Chemical compound [K+].CC([O-])=O SCVFZCLFOSHCOH-UHFFFAOYSA-M 0.000 description 4
- 239000011342 resin composition Substances 0.000 description 4
- 239000007790 solid phase Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- ZYZWCJWINLGQRL-UHFFFAOYSA-N 4-phenylcyclohexa-2,4-diene-1,1-diol Chemical group C1=CC(O)(O)CC=C1C1=CC=CC=C1 ZYZWCJWINLGQRL-UHFFFAOYSA-N 0.000 description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 3
- 125000005428 anthryl group Chemical group [H]C1=C([H])C([H])=C2C([H])=C3C(*)=C([H])C([H])=C([H])C3=C([H])C2=C1[H] 0.000 description 3
- 239000004305 biphenyl Substances 0.000 description 3
- 235000010290 biphenyl Nutrition 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- KYTZHLUVELPASH-UHFFFAOYSA-N naphthalene-1,2-dicarboxylic acid Chemical compound C1=CC=CC2=C(C(O)=O)C(C(=O)O)=CC=C21 KYTZHLUVELPASH-UHFFFAOYSA-N 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 125000005561 phenanthryl group Chemical group 0.000 description 3
- 125000001424 substituent group Chemical group 0.000 description 3
- PLIKAWJENQZMHA-UHFFFAOYSA-N 4-aminophenol Chemical compound NC1=CC=C(O)C=C1 PLIKAWJENQZMHA-UHFFFAOYSA-N 0.000 description 2
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- 238000006640 acetylation reaction Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000005227 gel permeation chromatography Methods 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 238000007561 laser diffraction method Methods 0.000 description 2
- UEGPKNKPLBYCNK-UHFFFAOYSA-L magnesium acetate Chemical compound [Mg+2].CC([O-])=O.CC([O-])=O UEGPKNKPLBYCNK-UHFFFAOYSA-L 0.000 description 2
- 239000011654 magnesium acetate Substances 0.000 description 2
- 229940069446 magnesium acetate Drugs 0.000 description 2
- 235000011285 magnesium acetate Nutrition 0.000 description 2
- RXOHFPCZGPKIRD-UHFFFAOYSA-N naphthalene-2,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)O)=CC=C21 RXOHFPCZGPKIRD-UHFFFAOYSA-N 0.000 description 2
- 235000011056 potassium acetate Nutrition 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000000790 scattering method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- CNHDIAIOKMXOLK-UHFFFAOYSA-N toluquinol Chemical compound CC1=CC(O)=CC=C1O CNHDIAIOKMXOLK-UHFFFAOYSA-N 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- UJAOSPFULOFZRR-UHFFFAOYSA-N (4-acetamidophenyl) acetate Chemical compound CC(=O)NC1=CC=C(OC(C)=O)C=C1 UJAOSPFULOFZRR-UHFFFAOYSA-N 0.000 description 1
- PXGZQGDTEZPERC-UHFFFAOYSA-N 1,4-cyclohexanedicarboxylic acid Chemical compound OC(=O)C1CCC(C(O)=O)CC1 PXGZQGDTEZPERC-UHFFFAOYSA-N 0.000 description 1
- MCTWTZJPVLRJOU-UHFFFAOYSA-N 1-methyl-1H-imidazole Chemical compound CN1C=CN=C1 MCTWTZJPVLRJOU-UHFFFAOYSA-N 0.000 description 1
- 241000284156 Clerodendrum quadriloculare Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 230000021736 acetylation Effects 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 125000006267 biphenyl group Chemical group 0.000 description 1
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 1
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- PNOXNTGLSKTMQO-UHFFFAOYSA-L diacetyloxytin Chemical compound CC(=O)O[Sn]OC(C)=O PNOXNTGLSKTMQO-UHFFFAOYSA-L 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- NWVVVBRKAWDGAB-UHFFFAOYSA-N hydroquinone methyl ether Natural products COC1=CC=C(O)C=C1 NWVVVBRKAWDGAB-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229940046892 lead acetate Drugs 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
- C08J2367/03—Polyesters derived from dicarboxylic acids and dihydroxy compounds the dicarboxylic acids and dihydroxy compounds having the hydroxy and the carboxyl groups directly linked to aromatic rings
Definitions
- the present invention relates to a method for producing liquid crystal polymer particles.
- liquid crystal polymers are excellent in dimensional stability, heat resistance, chemical stability, etc., their application as an insulating resin composition that constitutes electric and electronic parts such as electronic circuit boards is being studied.
- liquid crystal polymers generally have low melt tension and poor productivity in film forming, films made of liquid crystal polymers have the problem of being expensive.
- Patent Document 1 describes modified liquid crystalline polyester particles having a volume average particle diameter of 7.9 ⁇ m, which are obtained by spheroidizing amorphous particles made of liquid crystalline polyester.
- Patent Document 2 describes a liquid crystalline polyester powder having a volume average particle size of 8.9 ⁇ m.
- Patent Document 3 discloses a liquid crystalline polyester powder having an average particle size of 8 to 15 ⁇ m.
- an object of the present invention is to provide a method for producing polymer particles capable of controlling the particle size distribution in the small particle size range.
- the present inventors pulverized the liquid crystal polymer with an air flow pulverizer, and found that the cumulative distribution 50 % diameter D50 in the particle size distribution was 7.0 ⁇ m or less and the 95% diameter D
- the inventors have found that it is possible to obtain liquid crystal polymer particles in which 95 is controlled to 15.0 ⁇ m or less, and have completed the present invention.
- the present invention has been completed based on such findings.
- a method for making polymer particles is provided.
- the ratio of the modal diameter Dp to D50 in the particle size distribution of the liquid crystal polymer particles is preferably 0.7 or more and 1.3 or less.
- the pulverization is preferably carried out by colliding against a collision member in an air current.
- the embodiment of the present invention preferably further includes a step of classifying the liquid crystal polymer particles before or after pulverization.
- the liquid crystal polymer particles comprise a structural unit (I) derived from a hydroxycarboxylic acid, a structural unit (II) derived from a diol compound, a structural unit (III) derived from a dicarboxylic acid, It is preferred to include
- the structural unit (I) derived from hydroxycarboxylic acid is preferably a structural unit derived from 6-hydroxy-2-naphthoic acid.
- the composition ratio of the structural unit (I) is preferably 40 mol % or more and 80 mol % or less with respect to the structural units of the liquid crystal polymer particles as a whole.
- the particle size distribution can be controlled in a small particle size region. Furthermore, according to the method for producing liquid crystal polymer particles of the present invention, the production cost of liquid crystal polymer particles can be reduced because of excellent continuous productivity and economic efficiency.
- the method for producing liquid crystal polymer particles according to the present invention preferably includes a pulverization step and further includes a classification step.
- the classification step may be performed before the pulverization step, or may be performed after the pulverization step. Moreover, the pulverization step and the classification step may be sequentially repeated. Since the method for producing liquid crystal polymer particles according to the present invention is excellent in continuous productivity and economic efficiency, the production cost of liquid crystal polymer particles can be reduced.
- the pulverization step includes a step of pulverizing the liquid crystal polymer with an air flow pulverizer to obtain a liquid crystal polymer having a cumulative distribution 50% diameter D50 and a 95 % diameter D95 in the particle size distribution within specific ranges.
- the liquid crystal polymer used in the pulverization step may be a liquid crystal polymer powder that has been previously roughly pulverized to an average particle size of preferably 50 to 500 ⁇ m, more preferably about 60 to 300 ⁇ m.
- the pulverizing device for the liquid crystal polymer particles it is preferable to use a device that pulverizes the liquid crystal polymer particles by colliding with a collision member in an air current. Impingement allows the particle size distribution to be controlled in the region of smaller particle size.
- the classification step may be a step of classifying the liquid crystal polymer powder that has been coarsely pulverized in advance before the pulverization step, or a step of classifying the liquid crystal polymer particles after the pulverization step.
- the particle size distribution can be controlled in a smaller particle size region by classifying the liquid crystal polymer particles.
- the classifying device for liquid crystal polymer particles may be incorporated inside the pulverizing device, or may be provided separately.
- the pulverizing device includes a diffuser section that discharges compressed gas as a high-speed (for example, supersonic) continuous jet flow inside the main body of the pulverizing device, and a collision member that is arranged downstream of the diffuser section.
- a diffuser section that discharges compressed gas as a high-speed (for example, supersonic) continuous jet flow inside the main body of the pulverizing device, and a collision member that is arranged downstream of the diffuser section.
- a pulverizing device for supplying the pulverized material to the jet so that the pulverized material collides with the colliding member together with the continuous jet and pulverizes the pulverized material by the impact
- the diffuser section includes the compression Compressed gas flow path for flowing gas from upstream side to downstream side; and acceleration member for accelerating the compressed gas to high speed (e.g., supersonic speed), wherein the acceleration member is a peripheral wall surface of the compressed gas flow path and is arranged concentrically with the compressed gas flow path through an annular introduction gap through which the compressed gas is introduced, and the diffuser part is located in the middle of the compressed gas flow path, and the compressed gas flow
- a throat portion is further provided, which is an annular gap in which the distance between the peripheral wall surface of the passage and the outer peripheral surface of the acceleration member is narrower than the introduction gap on the upstream side.
- a conical portion is provided, and the outer peripheral surface of the conical portion for acceleration is an acceleration conical surface whose diameter is gradually reduced from the downstream end of the throat portion toward the downstream side, and is a part of the conical surface for acceleration.
- the acceleration member is arranged in the compressed gas flow path such that the downstream tip of the acceleration cone is flush with or downstream of the outlet of the compressed gas flow path. can be used.
- the crushing device with the above configuration may be equipped with a built-in classifier.
- the material to be pulverized introduced into the built-in classifier is classified into coarse powder and fine powder by centrifugal separation. Fine powder pulverized to a predetermined particle size is taken out of the pulverizer. On the other hand, coarse powder that has not been pulverized to a predetermined particle size is preferably sent to a pulverizer and pulverized.
- the classifier may be provided separately from the pulverizer.
- a classifier and a pulverizing device may be installed separately in the same predetermined plant so that the material to be pulverized that has been classified by the classifier can be supplied to the pulverizing device and pulverized into fine powder. Alternatively, the classifier and the pulverizer can be used alone without being combined.
- a commercially available device can also be used as the pulverization/classification device used to produce the liquid crystal polymer particles according to the present invention.
- the pulverizer described in JP-A-2017-70903 can be used.
- the liquid crystal polymer particles obtained by the production method of the present invention are fine particles having a specific particle size distribution obtained using a liquid crystal polymer as a raw material.
- the particle size distribution of the liquid crystal polymer particles can be measured using a laser diffraction/scattering method particle size distribution analyzer.
- the cumulative distribution 50% diameter D 50 (hereinafter referred to as “D 50 ”) in the particle size distribution represents the value of the particle size at which the cumulative distribution from the small particle size side is 50%
- the cumulative distribution 95% diameter D 95 (hereinafter referred to as “D 95 ”) represents the value of the particle size at which the cumulative distribution from the small particle size side is 90%
- the mode diameter D p (hereinafter referred to as “D p ”) is the most Represents a high frequency particle size value.
- the liquid crystal polymer particles are characterized by having a particle size distribution with a D50 of 7.0 ⁇ m or less and a D95 of D50 of 15.0 ⁇ m or less.
- D50 is preferably 0.1 ⁇ m or more, more preferably 1.0 ⁇ m or more, still more preferably 2.0 ⁇ m or more, and preferably 6.0 ⁇ m or less, more preferably 5.0 ⁇ m It is below.
- D95 is preferably 1.0 ⁇ m or more, more preferably 3.0 ⁇ m or more, still more preferably 5.0 ⁇ m or more, and preferably 12.0 ⁇ m or less, more preferably 10.0 ⁇ m It is below.
- D 95 is preferably 2.2 times or less, more preferably 2.0 times or less, still more preferably 1.8 times or less, and even if it is 1.1 times or more, D 50 good.
- D50 and D95 which are parameters in the particle size distribution of the liquid crystal polymer particles, within the above ranges, the dielectric loss tangent can be lowered when added to the resin molding.
- the values of D50 and D95 can be adjusted by the pulverization method and pulverization conditions of the liquid crystal polymer, the classification method and classification conditions before and after pulverization, and the like.
- the ratio of Dp to D50 in the particle size distribution is preferably 0.7 or more and 1.3 or less, more preferably 0.75 or more and 1.25 or less, and more preferably It is 0.8 times or more and 1.2 times or less.
- the value of Dp can be adjusted, like the values of D50 and D95 , by the pulverization method and pulverization conditions of the liquid crystal polymer particles, the classification method and classification conditions before and after pulverization, and the like.
- the liquid crystallinity of the liquid crystal polymer particles is measured by using a polarizing microscope (trade name: BH-2) manufactured by Olympus Co., Ltd. equipped with a microscope hot stage (trade name: FP82HT) manufactured by Mettler Co., Ltd., and heating the liquid crystal polymer particles with a microscope. It can be confirmed by observing the presence or absence of optical anisotropy after heating and melting on a stage.
- a polarizing microscope (trade name: BH-2) manufactured by Olympus Co., Ltd. equipped with a microscope hot stage (trade name: FP82HT) manufactured by Mettler Co., Ltd.
- the composition of the liquid crystal polymer which is the raw material for the liquid crystal polymer particles obtained by the production method of the present invention, is not particularly limited. It preferably contains structural unit (II) derived from aromatic dicarboxylic acid and structural unit (III) derived from aromatic dicarboxylic acid. Furthermore, the liquid crystal polymer according to the present invention may further contain a structural unit (IV) as a structural unit other than the structural units (I) to (III). Each structural unit contained in the liquid crystal polymer will be described below.
- the unit (I) constituting the liquid crystal polymer is a structural unit derived from a hydroxycarboxylic acid, preferably a structural unit derived from an aromatic hydroxycarboxylic acid represented by the following formula (I).
- structural unit (I) only 1 type may be contained and 2 or more types may be contained.
- Ar 1 in the above formula is selected from the group consisting of optionally substituted phenyl, biphenyl, 4,4'-isopropylidenediphenyl, naphthyl, anthryl and phenanthryl groups. Among these, a naphthyl group is preferred.
- Substituents include hydrogen, alkyl groups, alkoxy groups, fluorine, and the like.
- the number of carbon atoms in the alkyl group is preferably 1-10, more preferably 1-5. Moreover, it may be a linear alkyl group or a branched alkyl group.
- the number of carbon atoms in the alkoxy group is preferably 1-10, more preferably 1-5.
- Examples of monomers that give the structural unit represented by formula (I) include 6-hydroxy-2-naphthoic acid (HNA, formula (1) below), and acylates, ester derivatives, and acid halides thereof. be done.
- HNA 6-hydroxy-2-naphthoic acid
- the lower limit of the composition ratio (mol%) of the structural unit (I) to the structural units of the entire liquid crystal polymer is preferably 40 mol% or more, more preferably 45 mol% or more, and still more preferably 50 mol%. is more preferably 55 mol% or more, and the upper limit is preferably 80 mol% or less, more preferably 75 mol% or less, still more preferably 70 mol% or less, and furthermore More preferably, it is 65 mol % or less.
- the total molar ratio thereof should be within the range of the above compositional ratio.
- the unit (II) constituting the liquid crystal polymer is a structural unit derived from a diol compound, preferably a structural unit derived from an aromatic diol compound represented by the following formula (II).
- structural unit (II) only 1 type may be contained and 2 or more types may be contained.
- Ar 2 in the above formula is selected from the group consisting of optionally substituted phenyl, biphenyl, 4,4'-isopropylidenediphenyl, naphthyl, anthryl and phenanthryl groups.
- a phenyl group and a biphenyl group are preferred.
- Substituents include hydrogen, alkyl groups, alkoxy groups, fluorine, and the like.
- the number of carbon atoms in the alkyl group is preferably 1-10, more preferably 1-5.
- it may be a linear alkyl group or a branched alkyl group.
- the number of carbon atoms in the alkoxy group is preferably 1-10, more preferably 1-5.
- Monomers that give the structural unit (II) include, for example, 4,4-dihydroxybiphenyl (BP, formula (2) below), hydroquinone (HQ, formula (3) below), methylhydroquinone (MeHQ, formula (4) below. ), 4,4′-isopropylidenediphenol (BisPA, formula (5) below), and acylated products, ester derivatives, and acid halides thereof.
- BP 4,4-dihydroxybiphenyl
- HQ hydroquinone
- MeHQ methylhydroquinone
- BisPA 4,4′-isopropylidenediphenol
- acylated products, ester derivatives, and acid halides thereof are preferably used.
- the lower limit of the composition ratio (mol%) of the structural unit (II) to the structural units of the entire liquid crystal polymer is preferably 10 mol% or more, more preferably 12.5 mol% or more, and still more preferably 15 mol%. mol% or more, and more preferably 17.5 mol% or more, and the upper limit is preferably 30 mol% or less, more preferably 27.5 mol% or less, and still more preferably 25 mol%. % or less, and more preferably 22.5 mol % or less.
- the total molar ratio thereof should be within the range of the above compositional ratio.
- the unit (III) constituting the liquid crystal polymer is a structural unit derived from a dicarboxylic acid, preferably a structural unit derived from an aromatic dicarboxylic acid represented by the following formula (III).
- structural unit (III) only 1 type may be contained and 2 or more types may be contained.
- Ar 3 in the above formula is selected from the group consisting of optionally substituted phenyl, biphenyl, 4,4'-isopropylidenediphenyl, naphthyl, anthryl and phenanthryl groups. Among these, a phenyl group and a naphthyl group are preferred.
- Substituents include hydrogen, alkyl groups, alkoxy groups, fluorine, and the like.
- the number of carbon atoms in the alkyl group is preferably 1-10, more preferably 1-5. Moreover, it may be a linear alkyl group or a branched alkyl group.
- the number of carbon atoms in the alkoxy group is preferably 1-10, more preferably 1-5.
- Monomers that give the structural unit (III) include terephthalic acid (TPA, formula (6) below), isophthalic acid (IPA, formula (7) below), and 2,6-naphthalenedicarboxylic acid (NADA, formula (8) below. ), and their acylated products, ester derivatives, acid halides and the like.
- the lower limit of the composition ratio (mol%) of the structural unit (III) to the structural units of the entire liquid crystal polymer is preferably 10 mol% or more, more preferably 12.5 mol% or more, and still more preferably 15 mol%. mol% or more, and more preferably 17.5 mol% or more, and the upper limit is preferably 30 mol% or less, more preferably 27.5 mol% or less, and still more preferably 25 mol%. % or less, and more preferably 22.5 mol % or less.
- the total molar ratio thereof should be within the range of the above compositional ratio.
- the composition ratio of the structural unit (II) and the compositional ratio of the structural unit (III) are substantially equivalent ((structural unit (II) ⁇ structural unit (III)).
- the liquid crystal polymer may further contain structural units other than the above structural units (I) to (III).
- Structural unit (IV) is derived from a monomer other than the monomer that gives the structural units (I) to (III), and is polymerizable with the monomer that gives the structural units (I) to (III). It is not particularly limited as long as it is derived from a polymerizable monomer.
- Polymerizable groups include, for example, hydroxy groups, carboxyl groups, amine groups, and amide groups.
- the monomer that gives the structural unit (IV) has one or more, preferably two or more of these polymerizable groups. When two or more polymerizable groups are included, those polymerizable groups may be the same or different. Only one kind of structural unit (IV) may be contained, or two or more kinds thereof may be contained.
- Examples of the structural unit (IV) include the following structural unit (IV-1): is mentioned.
- Monomers that give the structural unit (IV-1) include acetaminophenone (AAP, the following formula (9)), p-aminophenol, 4′-acetoxyacetanilide, and acylates, ester derivatives, and acid halides thereof. is mentioned.
- Examples of monomers that give the structural unit (V-2) include 1,4-cyclohexanedicarboxylic acid (CHDA, formula (10) below), acylated products, ester derivatives, and acid halides thereof.
- CHDA 1,4-cyclohexanedicarboxylic acid
- composition ratio (mol%) of the structural unit (IV) to the structural units of the entire liquid crystal polymer can be appropriately set according to the composition ratio of the structural units (I) to (III). Specifically, if the composition ratio of each structural unit is appropriately set so that the monomer ratio (molar ratio) between the carboxyl group and the hydroxy group and/or amine group in the monomer charge is in the range of about 1:1. good.
- At least the structural unit of 6-hydroxy-2-naphthoic acid is in the range of 45 mol % or more and 75 mol % or less based on the total structural units of the liquid crystal polymer.
- a particularly preferred formulation of the liquid crystal polymer is: 45 mol% ⁇ 6-hydroxy-2-naphthoic acid-derived structural unit (I) ⁇ 75 mol% 12 mol% ⁇ structural unit (II) derived from aromatic diol compound ⁇ 27.5 mol% 3 mol% ⁇ structural unit (III) derived from terephthalic acid ⁇ 25 mol% 2 mol% ⁇ 2,6-naphthalene dicarboxylic acid-derived structural unit (III) ⁇ 9 mol% is.
- a liquid crystal polymer having a low dielectric loss tangent can be obtained if each structural unit is within the above range with respect to the structural units of the entire liquid crystal polymer.
- the melt viscosity of the liquid crystal polymer is preferably 5 Pa s or more as a lower limit under the conditions of the melting point of the liquid crystal polymer + 20 ° C. or more and the shear rate of 1000 s -1 . It is preferably 10 Pa ⁇ s or more, more preferably 15 Pa ⁇ s or more, and the upper limit is preferably 200 Pa ⁇ s or less, more preferably 150 Pa ⁇ s, and still more preferably 100 Pa ⁇ s or less.
- the liquid crystal polymer can be produced by polymerizing monomers that optionally give structural units (I) to (III) and optionally monomers that give structural unit (IV) by a conventionally known method.
- the liquid crystal polymer according to the present invention can also be produced by two-step polymerization in which a prepolymer is prepared by melt polymerization and then polymerized in solid state.
- the melt polymerization is carried out by mixing the monomers that optionally provide the structural units (I) to (III) and the monomers that optionally provide the structural unit (IV) with a predetermined blend. It is preferable to carry out under reflux of acetic acid in the presence of 1.05 to 1.15 molar equivalents of acetic anhydride with respect to all hydroxyl groups possessed by the monomers, with a total of 100 mol %.
- the prepolymer obtained by the melt polymerization is cooled and solidified, pulverized into powder or flakes, and then solid phase polymerized by a known solid phase polymerization method.
- a method of heat-treating the prepolymer resin in an inert atmosphere such as nitrogen or under vacuum at a temperature range of 200 to 350° C. for 1 to 30 hours is preferably selected.
- the solid phase polymerization may be carried out while stirring, or may be carried out in a still state without stirring.
- a catalyst may or may not be used in the polymerization reaction.
- the catalyst to be used conventionally known polyester polymerization catalysts can be used, and metals such as magnesium acetate, stannous acetate, tetrabutyl titanate, lead acetate, sodium acetate, potassium acetate, antimony trioxide, etc. Examples include salt catalysts, nitrogen-containing heterocyclic compounds such as N-methylimidazole, organic compound catalysts, and the like.
- the amount of the catalyst used is not particularly limited, but it is preferably 0.0001 to 0.1 parts by weight with respect to 100 parts by weight of the total amount of the monomers.
- the polymerization reactor for melt polymerization is not particularly limited, but a reactor generally used for reactions of high-viscosity fluids is preferably used.
- these reactors include, for example, an anchor type, multi-stage type, spiral band type, spiral shaft type, etc., or a stirred tank type polymerization reactor having a stirring device with stirring blades of various shapes modified from these, or , kneaders, roll mills, Banbury mixers, and the like, which are generally used for kneading resins.
- the liquid crystal polymer particles obtained by the production method of the present invention can be used as additives for resin compositions.
- the liquid crystal polymer particles described above have a low dielectric loss tangent, and by adding them to the resin composition, the dielectric loss tangent of the molded article made of the resin composition can be lowered. Therefore, the above-described liquid crystal polymer particles can be suitably used for insulating resin moldings constituting electric and electronic parts such as electronic circuit boards.
- the polymerization vessel in which acetic acid was distilled was heated at a rate of 0.5°C/min, and when the melt temperature in the vessel reached 310°C, the polymer was extracted and cooled to solidify.
- the resulting polymer was pulverized to a size that passed through a sieve with an opening of 2.0 mm to obtain a prepolymer.
- the temperature of the prepolymer obtained above was raised from room temperature to 295°C over 14 hours using a heater in an oven manufactured by Yamato Scientific Co., Ltd., and then the temperature was maintained at 295°C for 1 hour. Solid state polymerization was performed. After that, the heat was spontaneously released at room temperature, and a liquid crystal polymer A was obtained.
- an Olympus polarizing microscope (trade name: BH-2) equipped with a Mettler microscope hot stage (trade name: FP82HT)
- the liquid crystal polymer A is heated and melted on the microscope heating stage, and optically It was confirmed from the presence or absence of anisotropy that liquid crystallinity was exhibited.
- the melting points of the liquid crystal polymers A and B obtained above were measured by a differential scanning calorimeter (DSC) manufactured by Hitachi High-Tech Science Co., Ltd. in accordance with the test methods of ISO11357 and ASTM D3418. At this time, after the temperature was raised from room temperature to 360 to 380°C at a temperature elevation rate of 10°C/min to completely melt the polymer, the temperature was lowered to 30°C at a rate of 10°C/min, and further at a rate of 10°C/min. The apex of the endothermic peak obtained when the temperature was raised to 380° C. was taken as the melting point (Tm 2 ). Table 1 shows the measurement results.
- melt viscosities of the liquid crystal polymers A and B synthesized above were obtained by measuring the melt viscosities (Pa s) at a shear rate of 1000 S-1 at a melting point +20°C with a capillary rheometer viscometer (Toyo Seiki Seisakusho Capilograph 1D). Using a capillary with an inner diameter of 1 mm, it was measured according to JIS K7199. Table 1 shows the measurement results.
- Example 1 The liquid crystal polymer A powder (average diameter 80 ⁇ m) synthesized above was crushed by a collision plate type sonic airflow crusher (built-in classifier (adjusting ring: 70 mm, center navel: ⁇ 60 mm, blower setting: -45 kPa), Nippon Pneumatic Kogyo Co., Ltd., model number: SPK-12+UFS10) was used to pulverize at a pulverization pressure of 0.65 MPa and 4.35 kg / h. As a result, substantially spherical liquid crystal polymer particles were obtained.
- a collision plate type sonic airflow crusher built-in classifier (adjusting ring: 70 mm, center navel: ⁇ 60 mm, blower setting: -45 kPa), Nippon Pneumatic Kogyo Co., Ltd., model number: SPK-12+UFS10) was used to pulverize at a pulverization pressure of 0.65 MPa and 4.35 kg / h.
- Examples 2-8 Pulverization was carried out in the same manner as in Example 1, except that the type of liquid crystal polymer and its manufacturing process were changed as shown in Table 2, to obtain substantially spherical liquid crystal polymer particles.
- Example 9 The liquid crystal polymer B powder (average diameter 80 ⁇ m) synthesized above was crushed by a collision plate type sonic airflow crusher (built-in classifier (adjusting ring: 70 mm, center navel: ⁇ 60 mm, blower setting: -45 kPa), Nippon Pneumatic Kogyo Co., Ltd., model number: SPK-12+UFS10) was used to pulverize at a pulverization pressure of 0.65 MPa and 10 kg / h.
- a collision plate type sonic airflow crusher built-in classifier (adjusting ring: 70 mm, center navel: ⁇ 60 mm, blower setting: -45 kPa), Nippon Pneumatic Kogyo Co., Ltd., model number: SPK-12+UFS10) was used to pulverize at a pulverization pressure of 0.65 MPa and 10 kg / h.
- liquid crystal polymer particles after pulverization were classified by a classifier (adjustment ring height 30 mm, distance ring height 15 mm, guide vane gap 4 mm, center navel diameter ⁇ 40 mm, louver opening 1 mm, manufactured by Nippon Pneumatic Industry Co., Ltd., model number: DXF2). ) to obtain substantially spherical liquid crystal polymer particles.
- a classifier adjustment ring height 30 mm, distance ring height 15 mm, guide vane gap 4 mm, center navel diameter ⁇ 40 mm, louver opening 1 mm, manufactured by Nippon Pneumatic Industry Co., Ltd., model number: DXF2.
- Example 10-11 Pulverization was carried out in the same manner as in Example 9, except that the type of liquid crystal polymer particles and the production conditions thereof were changed as shown in Table 2 to obtain substantially spherical liquid crystal polymer particles.
- Comparative example 2 Pulverization was carried out in the same manner as in Comparative Example 1, except that the production conditions for the liquid crystal polymer particles were changed as shown in Table 2, to obtain substantially spherical liquid crystal polymer particles.
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Abstract
Description
液晶ポリマーを気流粉砕機で粉砕し、粒径分布における累積分布50%径D50が7.0μm以下、かつ95%径D95が15.0μm以下である液晶ポリマー粒子を得る工程を含む、液晶ポリマー粒子の製造方法が提供される。
本発明による液晶ポリマー粒子の製造方法は、粉砕工程を含み、分級工程をさらに含むことが好ましい。分級工程は、粉砕工程の前に行われてもよいし、粉砕工程の後に行われてもよい。また、粉砕工程と分級工程は順次繰り返し行われてもよい。本発明による液晶ポリマー粒子の製造方法は、連続生産性および経済性に優れるため、液晶ポリマー粒子の製造コストを低減させることができる。
本発明の製造方法により得られる液晶ポリマー粒子は、液晶ポリマーを原料として得られる特定の粒径分布を有する微粒子である。本発明において、液晶ポリマー粒子の粒径分布は、レーザー回折・散乱法粒径分布測定装置を用いて測定することができる。粒径分布における累積分布50%径D50と(以下、「D50」という)は、小粒径側からの累積分布が50%となる粒径の値を表し、累積分布95%径D95(以下、「D95」という)とは、小粒径側からの累積分布が90%となる粒径の値を表し、最頻度径Dp(以下、「Dp」という)とは、最も高い頻度の粒径の値を表す。
D50は、好ましくは0.1μm以上であり、より好ましくは1.0μm以上であり、さらに好ましくは2.0μm以上であり、また、好ましくは6.0μm以下であり、より好ましくは5.0μm以下である。
D95は、好ましくは1.0μm以上であり、より好ましくは3.0μm以上であり、さらに好ましくは5.0μm以上であり、また、好ましくは12.0μm以下であり、より好ましくは10.0μm以下である。
D95は、D50の好ましくは2.2倍以下であり、より好ましくは2.0倍以下であり、さらに好ましくは1.8倍以下であり、また、1.1倍以上であってもよい。
液晶ポリマー粒子の粒径分布におけるパラメータであるD50およびD95の値を上記範囲内に調節することによって、樹脂成形体に添加した際に誘電正接を低下させることができる。なお、D50およびD95の値は、液晶ポリマーの粉砕方法・粉砕条件や、粉砕前後の分級方法・分級条件等によって、調節することができる。
本発明の製造方法により得られる液晶ポリマー粒子の原料である液晶ポリマーは、その組成は特に限定されるものではないが、芳香族ヒドロキシカルボン酸に由来する構成単位(I)、芳香族ジオール化合物に由来する構成単位(II)、および芳香族ジカルボン酸に由来する構成単位(III)を含むことが好ましい。さらに、本発明による液晶ポリマーは、構成単位(I)~(III)以外の構成単位として、構成単位(IV)をさらに含んでもよい。以下、液晶ポリマーに含まれる各構成単位について説明する。
液晶ポリマーを構成する単位(I)は、ヒドロキシカルボン酸に由来する構成単位であり、下記式(I)で表される芳香族ヒドロキシカルボン酸に由来する構成単位であることが好ましい。なお、構成単位(I)は、1種のみが含まれてもよいし、2種以上含まれていてもよい。
液晶ポリマーを構成する単位(II)は、ジオール化合物に由来する構成単位であり、下記式(II)で表される芳香族ジオール化合物に由来する構成単位であることが好ましい。なお、構成単位(II)は、1種のみが含まれてもよいし、2種以上含まれていてもよい。
液晶ポリマーを構成する単位(III)は、ジカルボン酸に由来する構成単位であり、下記式(III)で表される芳香族ジカルボン酸に由来する構成単位であることが好ましい。なお、構成単位(III)は、1種のみが含まれてもよいし、2種以上含まれていてもよい。
液晶ポリマーは、上記構成単位(I)~(III)以外の他の構成単位をさらに含んでもよい。構成単位(IV)は、上記構成単位(I)~(III)を与えるモノマー以外の他のモノマーに由来するものであって、上記構成単位(I)~(III)を与えるモノマーと重合可能な重合性を有するモノマーに由来するものであれば特に限定されない。重合性基としては、例えば、ヒドロキシ基、カルボキシル基、アミン基、ならびにアミド基が挙げられる。構成単位(IV)を与えるモノマーはこれらの重合性基を1つ以上、好ましくは2つ以上有するものである。重合性基が2つ以上含まれる場合、それらの重合性基は同一であってもよいし、異なっていてもよい。構成単位(IV)は、1種のみが含まれてもよいし、2種以上含まれていてもよい。
45モル%≦6-ヒドロキシ-2-ナフトエ酸に由来する構成単位(I)≦75モル%
12モル%≦芳香族ジオール化合物に由来する構成単位(II)≦27.5モル%
3モル%≦テレフタル酸に由来する構成単位(III)≦25モル%
2モル%≦2,6-ナフタレンジカルボン酸に由来する構成単位(III)≦9モル%
である。
液晶ポリマー全体の構成単位に対して、各構成単位が上記範囲内であれば、誘電正接の低い液晶ポリマーを得ることができる。
液晶ポリマーは、所望により構成単位(I)~(III)を与えるモノマーおよび所望により構成単位(IV)を与えるモノマーを、従来公知の方法で重合することにより製造することができる。一実施態様において、本発明に係る液晶ポリマーは、溶融重合によりプレポリマーを作製し、これをさらに固相重合する2段階重合によっても製造することができる。
本発明の製造方法により得られる液晶ポリマー粒子は、樹脂組成物の添加剤として用いることができる。上記の液晶ポリマー粒子は、誘電正接が低く、樹脂組成物に添加することで、樹脂組成物からなる成形体の誘電正接を低下させることができる。そのため、上記の液晶ポリマー粒子を電子回路基板等の電気電子部品を構成する絶縁用の樹脂成形体に好適に用いることができる。
(合成例1)
攪拌翼を有する重合容器に、6-ヒドロキシ-2-ナフトエ酸(HNA)60モル%、4,4-ジヒドロキシビフェニル(BP)20モル%、テレフタル酸(TPA)15.5モル%、2,6-ナフタレンジカルボン酸(NADA)4.5モル%を加え、触媒として酢酸カリウムおよび酢酸マグネシウムを仕込み、重合容器の減圧-窒素注入を3回行って窒素置換を行った後、無水酢酸(水酸基に対して1.08モル当量)を更に添加し、150℃まで昇温し、還流状態で2時間アセチル化反応を行った。
重合条件を変更した以外は、合成例1と同様にして、液晶ポリマーBを得た。また、合成例1と同様にして、液晶ポリマーBが液晶性を示すことを確認した。
上記で得られた液晶ポリマーAおよびBの融点を、ISO11357、ASTM D3418の試験方法に準拠して、日立ハイテクサイエンス(株)製の示差走査熱量計(DSC)により測定した。このとき、昇温速度10℃/分で室温から360~380℃まで昇温してポリマーを完全に融解させた後、速度10℃/分で30℃まで降温し、更に10℃/分の速度で380℃まで昇温するときに得られる吸熱ピークの頂点を融点(Tm2)とした。測定結果を表1に示した。
上記で合成した液晶ポリマーAおよびBの溶融粘度は、せん断速度1000S-1における融点+20℃での溶融粘度(Pa・s)を、キャピラリーレオメーター粘度計((株)東洋精機製作所キャピログラフ1D)と内径1mmキャピラリーを用い、JIS K7199に準拠して測定した。測定結果を表1に示した。
上記で合成した液晶ポリマーAおよびBの重量平均分子量(Mw)、数平均分子量(Mn)、分子量分布(Mw/Mn)は、ゲルパーミエーションクロマトグラフィー(GPC)を用いて測定した。測定結果を表1に示した。
(実施例1)
上記で合成した液晶ポリマーAの粉末(平均径80μm)を、衝突板式音速気流粉砕機(内蔵分級機(アジャストリング:70mm、センターネーブル:センターネーブル:Φ60mm、ブロア設定:-45kPa)、日本ニューマチック工業株式会社製、型番:SPK-12+UFS10)を用いて、粉砕圧0.65MPa、4.35kg/hの条件で粉砕した。その結果、略球状の液晶ポリマー粒子を得た。
液晶ポリマーの種類およびその製造工程を表2に記載の通りに変更した以外は、実施例1と同様にして粉砕し、略球状の液晶ポリマー粒子を得た。
上記で合成した液晶ポリマーBの粉末(平均径80μm)を、衝突板式音速気流粉砕機(内蔵分級機(アジャストリング:70mm、センターネーブル:センターネーブル:Φ60mm、ブロア設定:-45kPa)、日本ニューマチック工業株式会社製、型番:SPK-12+UFS10)を用いて、粉砕圧0.65MPa、10kg/hの条件で粉砕した。その後、粉砕後の液晶ポリマー粒子を分級機(アジャストリング高さ30mm、ディスタンスリング高さ15mm、ガイドベーン隙間4mm、センターネーブル径Φ40mm、ルーバー開度1mm、日本ニューマチック工業株式会社製、型番:DXF2)を用いて、さらに分級し、略球状の液晶ポリマー粒子を得た。
液晶ポリマー粒子の種類およびその製造条件を表2に記載の通りに変更した以外は、実施例9と同様にして粉砕し、略球状の液晶ポリマー粒子を得た。
上記で合成した液晶ポリマーAの粉末(平均径80μm)を、衝撃型微粉砕機(内蔵分級機(ロータ形状:長ブレードロータ回転数:7000rpm、ブロア設定:-15kPa)、ホソカワミクロン株式会社製、型番:ACMパルベライザ-15H)を用いて、回転数7800rpm、供給速度26kg/hの条件で粉砕した。その結果、略球状の液晶ポリマー粒子を得た。
液晶ポリマー粒子の製造条件を表2に記載の通りに変更した以外は、比較例1と同様にして粉砕し、略球状の液晶ポリマー粒子を得た。
上記で合成した液晶ポリマーAの粉末(平均径80μm)を、高冷却型機械式微粉砕機(ホソカワミクロン株式会社製、型番:グラシスGC -15H)を用いて、回転数8000rpm、供給速度10kg/hの条件で粉砕した。その結果、略球状の液晶ポリマー粒子を得た。
上記で合成した液晶ポリマーAの粉末(平均径80μm)を、湿式微粉砕機(ボールミルタイプ、アシザワ・ファインテック株式会社製、型番:LMZ2)を用いて粉砕を試みたが、粉砕できなかった。
上記で合成した液晶ポリマーAの粉末(平均径80μm)を、湿式微粒化装置(株式会社スギノマシン製、型番:スターバースト5.5kw)を用いて粉砕を試みたが、粉砕できなかった。
(粒径分布の測定)
上記で得られた各液晶ポリマー粒子の粒径分布をレーザー回折・散乱法粒径分布測定装置(ベックマン・コールター社製、LS 13 320乾式システム、トルネードドライパウダーモジュール装着)で測定した。粒径分布を示すパラメータであるD50、D95およびDpは、測定データから演算結果として得た。結果を表2に示した。
Claims (7)
- 液晶ポリマーを気流粉砕機で粉砕し、粒径分布における累積分布50%径D50が7.0μm以下、かつ95%径D95が15.0μm以下である液晶ポリマー粒子を得る工程を含む、液晶ポリマー粒子の製造方法。
- 前記液晶ポリマー粒子の粒径分布における最頻度径DpのD50に対する比が、0.7以上1.3以下である、請求項1に記載の液晶ポリマー粒子。
- 前記粉砕が、気流中で衝突部材に衝突させることにより行われる、請求項1または2に記載の液晶ポリマー粒子の製造方法。
- 粉砕前または粉砕後の液晶ポリマー粒子を分級する工程をさらに含む、請求項1~3のいずれか一項に記載の液晶ポリマー粒子の製造方法。
- 前記液晶ポリマー粒子が、ヒドロキシカルボン酸に由来する構成単位(I)と、ジオール化合物に由来する構成単位(II)と、ジカルボン酸に由来する構成単位(III)と、を含む、請求項1~4のいずれか一項に記載の液晶ポリマー粒子の製造方法。
- 前記ヒドロキシカルボン酸に由来する構成単位(I)が、6-ヒドロキシ-2-ナフトエ酸に由来する構成単位である、請求項5に記載の液晶ポリマー粒子の製造方法。
- 前記構成単位(I)の組成比が、前記液晶ポリマー粒子全体の構成単位に対して、40モル%以上80モル%以下である、請求項5または6に記載の液晶ポリマー粒子の製造方法。
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JP2010077397A (ja) * | 2008-08-25 | 2010-04-08 | Sumitomo Chemical Co Ltd | 液晶ポリエステル粒子及びそれを用いる改質液晶ポリエステル粒子の製造方法 |
JP2015530460A (ja) * | 2012-09-27 | 2015-10-15 | ティコナ・エルエルシー | サーモトロピック液晶粉末 |
JP2020063451A (ja) * | 2014-08-01 | 2020-04-23 | Agc株式会社 | 樹脂パウダー及びその製造方法 |
JP2020132849A (ja) * | 2019-02-15 | 2020-08-31 | 住友化学株式会社 | 液晶ポリエステル粉末、液晶ポリエステル組成物、フィルムの製造方法、及び積層体の製造方法 |
WO2021033578A1 (ja) * | 2019-08-22 | 2021-02-25 | Eneos株式会社 | 液晶ポリマー粒子、熱硬化性樹脂組成物、および成形体 |
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JP2010077397A (ja) * | 2008-08-25 | 2010-04-08 | Sumitomo Chemical Co Ltd | 液晶ポリエステル粒子及びそれを用いる改質液晶ポリエステル粒子の製造方法 |
JP2015530460A (ja) * | 2012-09-27 | 2015-10-15 | ティコナ・エルエルシー | サーモトロピック液晶粉末 |
JP2020063451A (ja) * | 2014-08-01 | 2020-04-23 | Agc株式会社 | 樹脂パウダー及びその製造方法 |
JP2020132849A (ja) * | 2019-02-15 | 2020-08-31 | 住友化学株式会社 | 液晶ポリエステル粉末、液晶ポリエステル組成物、フィルムの製造方法、及び積層体の製造方法 |
WO2021033578A1 (ja) * | 2019-08-22 | 2021-02-25 | Eneos株式会社 | 液晶ポリマー粒子、熱硬化性樹脂組成物、および成形体 |
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