WO2018207728A9 - ポリアミド微粒子の製造方法およびポリアミド微粒子 - Google Patents
ポリアミド微粒子の製造方法およびポリアミド微粒子 Download PDFInfo
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/40—Polyamides containing oxygen in the form of ether groups
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- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
- C08G69/14—Lactams
- C08G69/16—Preparatory processes
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/321—Polymers modified by chemical after-treatment with inorganic compounds
- C08G65/325—Polymers modified by chemical after-treatment with inorganic compounds containing nitrogen
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- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/08—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from amino-carboxylic acids
- C08G69/14—Lactams
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/26—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/26—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
- C08G69/28—Preparatory processes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/46—Post-polymerisation treatment
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- 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
Definitions
- the present invention relates to a method of producing polyamide fine particles by a simple method, and polyamide fine particles made of polyamide having a high crystallization temperature, having a smooth surface, narrow particle size distribution and high sphericity.
- Polyamide fine particles are used in various applications such as powder coatings, taking advantage of features such as high toughness, flexibility and high heat resistance.
- polyamide resins such as polyamide 6 and polyamide 66, which have higher crystallization temperatures, have higher versatility and melting point than polyamide 12, so they may be widely applicable to applications with higher heat resistance, etc. Porous fine particles and fine particles having a wide particle size distribution are produced.
- polyamide 6 fine particles for example, there is a method of dissolving porous polyamide 6 in a solvent and then adding a non-solvent and water to produce porous polyamide 6 fine particles (patent documents 1 and 2). Further, there is a method of strongly stirring polyamide in a medium such as polyethylene glycol or a method of carrying out a polycondensation reaction of a polyamide raw material in a silicone oil medium (Patent Documents 3 and 4). As another method, anionic polymerization is carried out in paraffin medium to provide amorphous polyamide 6 fine particles (Patent Document 5).
- Patent Document 6 a process for producing polyamide 6 fine particles by anionic polymerization is disclosed in which the medium is changed to an aromatic halogen compound and a hydrocarbon-based polymer solution.
- Patent Document 6 A Unexamined-Japanese-Patent No. 2010-053272 Japanese Patent Application Laid-Open No. 60-040134 Japanese Patent Application Laid-Open No. 10-316750 Japanese Patent Application Laid-Open No. 61-181826 Japanese Patent Application Publication No. 08-073602
- Patent Documents 1 and 2 lower the solubility in a solvent to precipitate polyamide, fine particles of porous shape are produced.
- the manufacturing method of polyamide fine particles of the present invention has the following composition. That is, A method of producing polyamide fine particles by polymerizing the polyamide monomer (A) in the presence of the polymer (B) at a temperature higher than the crystallization temperature of the resulting polyamide, and at the start of the polymerization, the polyamide monomer (A) This is a method for producing polyamide fine particles, in which the polymer (B) is uniformly dissolved, and polyamide fine particles are precipitated after polymerization.
- the polyamide fine particles of the present invention have the following constitution. That is, Polyamide particles having a number average particle size of 0.1 to 100 ⁇ m, a sphericity of 90 or more, a particle size distribution index of 3.0 or less, linseed oil absorption of 100 mL / 100 g or less, and a crystallization temperature of 150 ° C. or more It is.
- polyamide fine particle production method of the present invention it is preferable to further produce polyamide fine particles in the presence of the monomer (A) and the solvent (C) of the polymer (B).
- the square of the solubility parameter difference between the monomer (A) and the polymer (B) is 0.1-25, and the square of the solubility parameter difference between the polyamide and the polymer (B) is 0. It is preferably in the range of 1 to 16.
- the solvent (C) is preferably water.
- the polymer (B) does not have a polar group or has any one selected from a hydroxyl group and a hydroxyl group.
- the polymer (B) is preferably polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyethylene glycol-polypropylene glycol copolymer, and their alkyl ether.
- the molecular weight of the polymer (B) is preferably 500 to 500,000.
- the polyamide constituting the polyamide fine particles is preferably any one selected from polyamide 6, polyamide 66, and copolymers thereof.
- the weight average molecular weight of the polyamide constituting the polyamide fine particles is preferably 8,000 or more.
- a polyamide having a high crystallization temperature as spherical particles having a smooth surface and a smooth shape by a safe and simple method.
- the fine particles of polyamide have slip properties as well as high heat resistance and chemical resistance inherent to polyamide having a high crystallization temperature and also a narrow particle size distribution and a spherical surface and a smooth surface, so that paints and adhesives are obtained.
- the concentration of the amide group in the polyamide is increased, and thus the moisturizing property is increased, and it is possible to achieve both a smooth and uniform feel and a moist feeling due to the true sphere shape and uniform particle size.
- FIG. 2 is a scanning electron micrograph of polyamide fine particles obtained by Example 1.
- FIG. 5 is a scanning electron micrograph of polyamide fine particles obtained by Example 2.
- FIG. 10 is a scanning electron micrograph of the polyamide fine particles obtained in Example 8. It is a scanning electron micrograph of the polyamide fine particle obtained by Example 10.
- FIG. It is a scanning electron micrograph of the polyamide fine particle obtained by the comparative example 3.
- FIG. 5 is a scanning electron micrograph of polyamide fine particles obtained by Example 1.
- FIG. 5 is a scanning electron micrograph of polyamide fine particles obtained by Example 2.
- FIG. 10 is a scanning electron micrograph of the polyamide fine particles obtained in Example 8. It is a scanning electron micrograph of the polyamide fine particle obtained by Example 10.
- FIG. It is a scanning electron micrograph of the polyamide fine particle obtained by the comparative example 3.
- the present invention polymerizes the monomer (A) of the polyamide in the presence of the polymer (B) at a temperature higher than the crystallization temperature of the polyamide obtained by polymerizing the monomer (A) to produce polyamide fine particles.
- This method is a method in which the monomer (A) and the polymer (B) of the polyamide are uniformly dissolved at the start of the polymerization, and the polyamide fine particles are precipitated after the polymerization, so that the crystallization temperature is difficult in the conventional method. Even for polyamides having a high melting point and a high melting point, it is characterized in that polyamide fine particles having true spheres, smooth surfaces, fine, and narrow particle size distribution can be obtained.
- the reaction vessel is a transparent solution.
- the fact that the monomer (A) of the polyamide and the polymer (B) are incompatible when in suspension or in two phases at the start of polymerization indicates that the formation of aggregates, strong stirring, etc. is necessary. Become.
- the polymerization may be started after the monomer (A) and the polymer (B) of the polyamide are homogenized using the solvent (C).
- Whether or not polyamide fine particles are precipitated after polymerization may be visually confirmed that the reaction vessel is a suspension.
- a homogeneous solution at the end of the polymerization indicates that the polyamide and the polymer (B) are uniformly compatible and become aggregates or porous fine particles by cooling or the like.
- the polyamide constituting the polyamide fine particles of the present invention is a polymer having a structure containing an amide group, and is a polycondensation reaction of an amino acid which is a monomer (A) of polyamide, an anionic ring-opening polymerization with lactams and an initiator, a cation It is produced by ring-opening polymerization, ring-opening polymerization after hydrolysis with water or the like, polycondensation reaction of dicarboxylic acid and diamine, or salts thereof.
- These monomers (A) may be used in combination of two or more as long as the present invention is not impaired, and may contain other copolymerizable components.
- the solubility of the monomer (A) and the polymer (B) is improved, and the particle size of the obtained polyamide fine particles is fine and the particle size distribution becomes narrow, aminohexanoic acid, ⁇ -caprolactam and hexamethylenediamine Adipic acid is preferred, aminohexanoic acid and ⁇ -caprolactam are more preferred, and ⁇ -caprolactam is most preferred.
- polyamide produced by polymerizing the monomer (A) include polycaproamide (polyamide 6), polyhexamethylene adipamide (polyamide 66), polytetramethylene adipamide (polyamide) Polyamide 46), polytetramethylene sebacamide (polyamide 410), polypentamethylene adipamide (polyamide 56), polypentamethylene sebacamide (polyamide 510), polyhexamethylene sebacamide (polyamide 610), polyhexamethylene Methylene dodecamide (polyamide 612), polydeca methylene adipamide (polyamide 106), poly dodeca methylene adipamide (polyamide 126), poly deca methylene sebacamide (polyamide 1010), reundecane amide (polyamide 11), poly Dodecaamide (polyamide 12), polyhexamethylene terephthalamide (polyamide 6T), polydecamethylene terephthalamide (polyamide 10T), polycaproamide
- the particle diameter of the obtained polyamide fine particles is fine and the particle size distribution becomes narrow, and furthermore, the heat resistance of the polyamide constituting the obtained polyamide fine particles becomes high. It is more preferable that there be any one selected from polyamide 6, polyamide 66 and copolymers thereof.
- the range of weight average molecular weight of polyamide constituting polyamide fine particles is preferably 8,000 to 3,000,000. From the viewpoint of inducing phase separation with the polymer (B), the weight average molecular weight is more preferably 10,000 or more, still more preferably 15,000 or more, and most preferably 20,000 or more. In the present invention, since the viscosity during polymerization depends on the polymer (B), the viscosity increase due to the molecular weight increase of the polyamide is suppressed. Therefore, there is an advantage that the polymerization time of the polyamide can be extended and the molecular weight can be extremely high.
- the weight average molecular weight of the polyamide is preferably 2,000,000 or less, more preferably 1,000,000. The following are more preferable.
- the weight average molecular weight of the polyamide which comprises polyamide fine particles shows the weight average molecular weight which converted the value which measured by gel permeation chromatography by using a hexafluoroisopropanol as a solvent with polymethyl methacrylate.
- the polymer (B) in the present invention is a polymer which is soluble in the monomer (A) of the polyamide at the start of the polymerization but is not compatible with the polyamide after the polymerization.
- the dissolution is judged by whether the polymer (B) and the monomer (A) are uniformly dissolved under the conditions of temperature and pressure at which the polymerization is started.
- the incompatibility between the polymer (B) and the polyamide is judged by whether it is separated into a suspension or two phases under the conditions of temperature and pressure after polymerization. It is possible to determine whether the solution is a homogeneous solution, a suspension, or two-phase separation by visually confirming the reaction vessel.
- the polymer (B) is preferably nonreactive with the polyamide monomer from the viewpoint of precipitating the polyamide fine particles from a uniform solution.
- the polymer (B) does not have a carboxyl group forming an amide group of polyamide or a polar group that reacts with an amino group, or has a polar group having low reactivity with a carboxyl group or an amino group It is preferable that As a polar group which reacts with a carboxyl group or an amino group, an amino group, a carboxyl group, an epoxy group, an isocyanate group etc. are mentioned.
- Examples of polar groups having low reactivity with carboxyl groups and amino groups include hydroxyl groups and hydroxyl groups, but from the viewpoint of suppressing the cross-linking reaction, the number of polar groups in the polymer (B) is 4 or less. It is preferable that there be three, three or less is more preferable, and two or less is most preferable.
- the polymer (B) is incompatible with the polyamide although it is incompatible with the polyamide from the viewpoint of making the fine polyamide particles to be formed fine and the solubility in the monomer (A) high and the particle size distribution narrow. Is preferred.
- the affinity between the monomer (A) / polymer (B) and between the polymer (B) / polyamide is determined by the respective solubility parameters (hereinafter referred to as SP values) as ⁇ A , ⁇ B , ⁇ PA (J 1 / 2 / cm 3/2) and were in the monomer (a) and polymer (B) between the square of the solubility parameter difference, namely ( ⁇ a - ⁇ B) 2, the polymer (B) and the polyamide
- the interval can be represented by the square of the solubility parameter difference, that is, ( ⁇ PA ⁇ B ) 2 .
- ( ⁇ A ⁇ B ) 2 preferably satisfies the range of 0.1 to 25.
- the lower limit of ( ⁇ A ⁇ B ) 2 is more preferably 0.3 or more, further preferably 0.5 or more, and particularly preferably 1 or more.
- the upper limit of ( ⁇ A ⁇ B ) 2 is more preferably 16 or less, still more preferably 12 or less, particularly preferably 10 or less, and most preferably 7 or less.
- ( ⁇ PA ⁇ B ) from the viewpoint of preventing the polymer (B) from compatibilizing uniformly and preventing the polyamide fine particles from being obtained, and preventing the polyamide from becoming aggregates and becoming incompatible. 2 preferably satisfies the range of 0.1 1-16.
- the lower limit of ( ⁇ PA ⁇ B ) 2 is more preferably 0.3 or more, further preferably 0.5 or more, and particularly preferably 1 or more.
- the upper limit of ( ⁇ PA ⁇ B ) 2 is more preferably 12 or less, further preferably 10 or less, particularly preferably 7 or less, and most preferably 4 or less.
- the SP value is calculated from the cohesive energy density and molar volume of the Hoftyzer-Van Krevelen described in Properties of Polymers 4th Edition (D. W. Van Krevelen, published by Elsevier Science 2009), Chapter 7 and P 215. .
- the value calculated from the cohesive energy density and molar molecular volume of Fedors described in the same chapter P195 is shown.
- the value which added the product of each SP value and a mole fraction is shown.
- polymer (B) examples include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polypentamethylene glycol, polyhexamethylene glycol, polyethylene glycol-polypropylene glycol copolymer, polyethylene glycol-polytetramethylene glycol Copolymerization and hydroxyl groups at one end or both ends of these groups were blocked with methyl group, ethyl group, propyl group, isopropyl group, butyl group, hexyl group, octyl group, decyl group, dodecyl group, hexadecyl group, octadecyl group, etc.
- Examples thereof include alkyl ether and alkyl phenyl ether blocked with octylphenyl group.
- the polyethylene glycol, the polyethylene glycol-polypropylene glycol copolymer, the polypropylene glycol, the polytetramethylene glycol, and the like are excellent in the compatibility with the polyamide monomer (A) and the particle size distribution of the obtained polyamide particles is narrowed.
- alkyl ethers are preferable, and from the viewpoint of being excellent in the ring opening polymerization by hydrolysis of the polyamide monomer (A) and the compatibility with water used as a solvent, polyethylene glycol and polyethylene glycol-polypropylene glycol co Polymers are more preferred, and polyethylene glycol is most preferred. Two or more of these may be used at the same time as long as the present invention is not impaired.
- the weight average molecular weight of the polymer (B) is preferable The upper limit is 500,000, preferably 100,000 or less, and more preferably 50,000 or less.
- the polymer (B) preferably has a weight average molecular weight of 500 or more, more preferably 1,000 or more, from the viewpoint of preventing the formation of polyamide fine particles from becoming difficult due to excessive improvement in the compatibility between the polymer (B) and the polyamide. Preferably, 2,000 or more is more preferable.
- the weight average molecular weight of a polymer (B) shows the weight average molecular weight which converted the value measured by gel permeation chromatography by using water as a solvent with polyethylene glycol.
- a polymer (B) is not melt
- the weight average molecular weight which converted the value measured by gel permeation chromatography by using tetrahydrofuran as a solvent with polystyrene is shown.
- the polymerization is initiated at a temperature higher than the crystallization temperature of the polyamide obtained by polymerizing the monomer (A). Produce microparticles.
- the polyamide fine particles are uniformly induced without being crystallized as the monomer (A) is converted to the polyamide in a uniform mixed solution, the spheres are smooth after the polymerization, the surface is smooth, and the particle size distribution is narrow. It is believed that polyamide fine particles precipitate.
- the mass ratio of the monomer (A) to the polymer (B) in the polymerization is preferably in the range of 5/95 to 80/20.
- the mass ratio lower limit of the monomer (A) / polymer (B) is more preferably 10/90, still more preferably 20/80, and most preferably 30/70.
- 70/30 is more preferable, 60/40 is further more preferable, and 50/50 is particularly preferable.
- a method of polymerizing the monomer (A) to a polyamide known methods can be used. The method depends on the type of monomer (A), but in the case of lactams, anionic ring-opening polymerization using an alkali metal such as sodium or potassium or an organic metal compound such as butyllithium or butylmagnesium as an initiator
- an acid-based cationic ring-opening polymerization, a hydrolytic ring-opening polymerization using water or the like, and the like are generally used.
- the ring-opening polymerization method for lactams by hydrolysis is not limited as long as it is a known method, but it is pressurized in the coexistence of water to generate an amino acid while promoting the hydrolysis of the lactam, and then the water is removed
- a method of conducting ring-opening polymerization and polycondensation reaction is preferred.
- the amount of water used is not particularly limited as long as hydrolysis of lactams proceeds, but the amount of water used is usually 100 parts by mass of the total of monomer (A) and polymer (B).
- the amount is preferably 100 parts by mass or less.
- the amount of water used is more preferably 70 parts by mass or less, further preferably 50 parts by mass or less, and particularly preferably 30 parts by mass or less.
- the lower limit of the amount of water used is preferably 1 part by mass or more, more preferably 2 parts by mass or more, further preferably 5 parts by mass or more, and particularly preferably 10 parts by mass or more in order to prevent the progress of the hydrolysis reaction of lactams. preferable.
- a method of removing water (condensed water) generated by condensation during polycondensation a known method such as a method of removing with flowing inert gas such as nitrogen under normal pressure, a method of removing under reduced pressure, etc. is used appropriately it can.
- the monomer (A) is an amino acid, a dicarboxylic acid and a diamine, or a salt thereof
- a polycondensation reaction can be used as a polymerization method.
- these monomers (A) there is a combination which does not dissolve uniformly with the polymer (B).
- a solvent (C) of the monomer (A) and the polymer (B) it is possible to produce polyamide fine particles by further adding a solvent (C) of the monomer (A) and the polymer (B) .
- the solvent (C) is not particularly limited as long as it is in the above range, but it is necessary to dissolve the monomer (A) and the polymer (B), and to carry out the condensation which needs to be discharged out of the system to advance the polycondensation reaction.
- Water is most preferred as it is identical to water.
- an amino acid such as aminohexanoic acid or aminododecanoic acid as the monomer (A)
- a dicarboxylic acid such as adipic acid and hexamethylenediamine and a diamine
- B polyethylene glycol, polyethylene glycol-polypropylene glycol copolymer, and their alkyl ether as B) and water as a solvent (C)
- a homogeneous solution is formed at the temperature at which polymerization is initiated. Thereafter, by discharging the water of the solvent (C) and the condensation water generated by the progress of the polycondensation to the outside of the reaction tank, it becomes possible to produce polyamide fine particles while the polymerization proceeds.
- the amount of water used as the solvent (C) is preferably 10 to 200 parts by mass.
- the amount of water used is preferably 150 parts by mass or less, and more preferably 120 parts by mass or less, from the viewpoint of preventing the particle size from becoming coarse.
- the amount of water used is more preferably 20 parts by mass or more, and still more preferably 40 parts by mass or more.
- lactams and an amino acid and / or dicarboxylic acid and diamine may be used in mixture of 2 or more types, in this case, water functions as hydrolysis and a solvent (C).
- the polymerization temperature is not particularly limited as long as polymerization of the polyamide proceeds, but from the viewpoint of controlling the polyamide having a high crystallization temperature closer to a true sphere and having a smooth surface, the polymerization temperature can be obtained It is preferable to set it as the temperature more than the crystallization temperature.
- the polymerization temperature is more preferably at least 15 ° C. of crystallization temperature of the obtained polyamide, more preferably at least 30 ° C. of crystallization temperature of the obtained polyamide, and at least 45 ° C. of crystallization of the obtained polyamide. Is particularly preferred.
- the polymerization temperature is preferably the melting point of the obtained polyamide + 100 ° C. or less, and the melting point of the obtained polyamide
- the temperature is preferably + 50 ° C. or less, more preferably the melting point of the obtained polyamide is + 20 ° C. or less, particularly preferably polymerization at the same temperature as the melting point of the obtained polyamide, and the melting point of the obtained polyamide is ⁇ 10 ° C. or less Most preferred.
- the crystallization temperature of the polyamide constituting the polyamide fine particles is raised at a rate of 20 ° C./minute from the endothermic peak showing the melting point of the polyamide at 30 ° C. to 30 ° C. under nitrogen atmosphere using DSC method. After holding, it is held for 1 minute, and shows the peak of the exothermic peak appearing when the temperature is cooled to 30 ° C. at a rate of 20 ° C./min. Further, after cooling once, the peak of the endothermic peak when the temperature is further raised at 20 ° C./min is taken as the melting point of the polyamide fine particles.
- the polymerization time can be appropriately adjusted according to the molecular weight of the polyamide fine particles to be obtained, but the polymerization proceeds to ensure that the polyamide fine particles are obtained, while side reactions and coloring of the polyamide such as a three-dimensional crosslinked product From the viewpoint of preventing the progress of deterioration of the polymer (B) and the like, the range of 0.1 to 70 hours is usually preferable.
- the lower limit of the polymerization time is preferably 0.2 hours or more, more preferably 0.3 hours or more, and particularly preferably 0.5 hours or more.
- the upper limit of the polymerization time is preferably 50 hours or less, more preferably 25 hours or less, and particularly preferably 10 hours or less.
- a polymerization accelerator may be added as long as the effects of the present invention are not impaired.
- the promoter known ones can be used, and examples thereof include inorganic phosphorus compounds such as phosphoric acid, phosphorous acid, hypophosphorous acid, pyrophosphoric acid, polyphosphoric acid and alkali metal salts thereof and alkaline earth metal salts thereof. Be Two or more of these may be used. Although it can select suitably as addition amount, it is preferable to add 1 mass part or less with respect to 100 mass parts of monomers (A).
- additives such as surfactants for controlling the particle size of polyamide particles, dispersants, stability of polymer (B) used to modify the properties of polyamide particles, and Antioxidants, heat-resistant stabilizers, weathering agents, lubricants, pigments, dyes, plasticizers, antistatic agents, flame retardants, etc., for improving are mentioned. Two or more of these may be used. Further, two or more different materials may be used for the purpose of modifying the monomer (A) or the polyamide and the purpose of modifying the polymer (B). Although it can select suitably as addition amount, it is preferable to add 1 mass part or less with respect to a total of 100 mass parts of a monomer (A) and a polymer (B).
- the polyamide fine particles are uniformly induced from the uniform solution, so fine fine particles can be produced without stirring.
- the stirring device it is possible to use a known device such as a stirring blade, a melt kneader, a homogenizer, etc.
- a stirring blade a propeller, paddle, flat, turbine, cone, anchor, screw, helical type etc. It can be mentioned.
- the stirring speed depends on the type of polymer (B) and the molecular weight, but from the viewpoint of preventing the liquid from adhering to the wall and changing the mixing ratio etc.
- the lower limit of the stirring speed is more preferably 10 rpm or more, still more preferably 30 rpm or more, particularly preferably 50 rpm or more, and the upper limit of the stirring speed is more preferably 1,600 rpm or less, still more preferably 1,200 rpm or less, Particularly preferred is 800 rpm or less.
- the mixture at the time of completion of polymerization is discharged after being discharged into a poor solvent of polyamide fine particles, or isolated in a reaction vessel
- fine-particles etc. are mentioned.
- the mixture is cooled to a temperature not higher than the melting point of the polyamide particles, more preferably not higher than the crystallization temperature.
- the method of discharging and isolating to the above, or the method of isolating the poor solvent of polyamide fine particles in the reaction vessel is preferable, and the method of isolating and adding the poor solvent of polyamide fine particles to the reaction vessel is more preferable.
- the isolation method known methods such as decompression, pressure filtration, decantation, centrifugation, spray drying and the like can be appropriately selected.
- the poor solvent for the polyamide fine particles is preferably a solvent which does not dissolve the polyamide and further dissolves the monomer (A) or the polymer (B).
- a solvent can be selected as appropriate, but alcohols such as methanol, ethanol and isopropanol and water are preferable.
- Washing, isolation and drying of the polyamide fine particles can be carried out by known methods.
- a washing method for removing attached substances and inclusions on polyamide fine particles reslurry washing or the like can be used, and heating may be appropriately performed.
- the solvent used in the washing is not limited as long as it is a solvent which does not dissolve the polyamide fine particles and dissolves the monomer (A) or the polymer (B), and from the economical point of view methanol, ethanol, isopropanol or water Preferably, water is most preferred.
- the isolation can be appropriately selected from decompression, pressure filtration, decantation, centrifugation, spray drying and the like. Drying is preferably carried out below the melting point of the polyamide fine particles, and the pressure may be reduced. Air drying, hot air drying, heat drying, reduced pressure drying, freeze drying and the like are selected.
- polyamide fine particles are produced by the above-mentioned method, in the present invention, it is possible in particular to produce polyamide fine particles having a high crystallization temperature, which have been difficult until now, with uniform particle diameter and spherical shape and smooth surface. is there.
- the high crystallization temperature polyamide constituting the polyamide fine particles of the present invention indicates a crystalline polyamide having a crystallization temperature of 150 ° C. or more.
- the crystallization temperature of the polyamide is preferably 160 ° C. or higher, more preferably 170 ° C. or higher, and still more preferably 180 ° C. or higher, because the melting point and chemical resistance due to the crystallinity increase and the polyamide becomes higher heat resistance. .
- the crystallization temperature of the polyamide is preferably 300 ° C. or less, more preferably 280 ° C. or less, and particularly preferably 260 ° C. or less.
- polycaproamide polyamide 6
- polyhexamethylene adipamide polyamide 66
- polytetramethylene adipamide polyamide 46
- polytetramethylene sebacamide polyamide 410
- poly Pentamethylene adipamide polyamide 56
- polypentamethylene sebacamide polyamide 510
- polyhexamethylene sebacamide polyamide 610
- polyhexamethylene dodecamide polyamide 612
- polydecamethylene adipamide polyamide
- polyamide 106 polydodecamethylene adipamide
- polyamide 126 polyhexamethylene terephthalamide
- polydecamethylene terephthalamide polyamide 10T
- polycaproamide / polyhexamethylene adipamide copolymer Liamido 6/66) and the like
- polycaproamide polyamide 6
- polyhexamethylene adipamide polyamide 66
- polyhexamethylene sebacamide polyamide 410
- poly Pentamethylene adipamide polyamide 56
- the number average particle diameter of the polyamide fine particles of the present invention is in the range of 0.1 to 100 ⁇ m. When the number average particle size exceeds 100 ⁇ m, the coating film surface produced from the particles becomes inhomogeneous.
- the number average particle diameter of the polyamide fine particles is preferably 80 ⁇ m or less, more preferably 60 ⁇ m or less, still more preferably 50 ⁇ m or less, and particularly preferably 30 ⁇ m or less. When the number average particle size is less than 0.1 ⁇ m, aggregation of particles occurs.
- the number average particle diameter of the polyamide fine particles is preferably 0.3 ⁇ m or more, more preferably 0.7 ⁇ m or more, still more preferably 1 ⁇ m or more, particularly preferably 2 ⁇ m or more, and most preferably 3 ⁇ m or more.
- the particle size distribution index showing the particle size distribution of the polyamide fine particles in the present invention is 3.0 or less. When the particle size distribution index exceeds 3.0, the flowability is poor in coating and cosmetic applications, and the uniformity of the coating film surface is impaired.
- the particle size distribution index is preferably 2.0 or less, more preferably 1.5 or less, still more preferably 1.3 or less, and most preferably 1.2 or less. Moreover, the lower limit is theoretically 1.
- the number average particle diameter of the polyamide fine particles can be calculated by specifying 100 particle diameters at random from a scanning electron micrograph and calculating its arithmetic mean.
- the maximum particle diameter is taken as the particle diameter.
- the magnification is measured at least 1,000 times or more, preferably 5,000 times or more.
- the particle size distribution index is determined based on the following numerical conversion formula, for the value of the particle size obtained above.
- Di particle diameter of individual particles
- n number of measurements 100
- Dn number average particle diameter
- Dv volume average particle diameter
- PDI particle diameter distribution index.
- the polyamide fine particles of the present invention have a smooth surface in addition to a true spherical shape, and therefore can impart good slipperiness and fluidity to cosmetics and paints.
- the sphericity showing the sphericity of the polyamide fine particles is 90 or more. If the sphericity is less than 90, a smoother feel can not be given in cosmetic and paint applications.
- the sphericity is preferably 95 or more, more preferably 97 or more, and still more preferably 98 or more.
- the upper limit is 100.
- the sphericity of the polyamide fine particles is determined by observing 30 particles at random from a scanning electron micrograph and from the minor axis and major axis according to the following formula.
- the smoothness of the surface of the polyamide fine particles can be expressed by the amount of polyamide fine particles absorbing linseed oil. That is, as the surface is smoother, fine particles having no pores on the surface become, and the amount of oil absorption of linseed oil, which indicates the amount of absorption of linseed oil, decreases.
- the linseed oil absorption of the polyamide fine particles of the present invention is 100 mL / 100 g or less. When the linseed oil absorption of the polyamide fine particles exceeds 100 mL / 100 g, it is not possible to impart good fluidity to cosmetics and paints.
- the lower limit of linseed oil absorption is 0 mL / 100 g or more.
- linseed oil oil absorption is measured according to Japanese Industrial Standard (JIS standard) JIS K 5101 "Pigment test method” refined linseed oil method ".
- the smoothness of the surface can also be represented by the BET specific surface area by gas adsorption, and the smoother the surface, the smaller the BET specific surface area. Specifically, it is preferably 10 m 2 / g or less, more preferably 5 m 2 / g or less, still more preferably 3 m 2 / g or less, particularly preferably 1 m 2 / g or less, and most preferably Preferably it is 0.5 m ⁇ 2 > / g or less.
- the BET specific surface area is measured according to Japanese Industrial Standard (JIS Standard) JIS R 1626 (1996) “Method of measuring specific surface area by gas adsorption BET method”.
- the number average particle size of the polyamide fine particles was calculated by specifying 100 particle diameters at random from a scanning electron micrograph and calculating its arithmetic mean. In the above photograph, in the case of non-round shape, that is, in the case of an elliptical shape, the maximum particle diameter was taken as the particle diameter. Moreover, the particle diameter distribution index calculated the value of the particle diameter obtained above based on the following numerical conversion formula.
- Di particle diameter of individual particles
- n number of measurements 100
- Dn number average particle diameter
- Dv volume average particle diameter
- PDI particle diameter distribution index.
- the sphericity of the polyamide fine particles was obtained by observing 30 particles at random from a scanning electron micrograph and calculating from the minor axis and major axis according to the following formula.
- Crystallization temperature and melting point of polyamide constituting polyamide fine particles Using a differential scanning calorimeter (DSCQ20) manufactured by TA Instruments, 30 ° C. higher than the endothermic peak showing melting point of polyamide from 30 ° C. in a nitrogen atmosphere The temperature was raised at a rate of 20 ° C./min to a temperature, held for 1 minute, and the peak of the exothermic peak appearing when the temperature was cooled to 30 ° C. at a rate of 20 ° C / min was defined as the crystallization temperature. The endothermic peak when the temperature was further raised at 20 ° C./min after cooling was taken as the melting point. The amount of polyamide particles required for the measurement is about 8 mg.
- the weight average molecular weight of the polymer (B) was calculated using gel permeation chromatography, and was compared with a calibration curve with polyethylene glycol to calculate the molecular weight.
- the measurement sample was prepared by dissolving about 3 mg of the polymer (B) in about 6 g of water.
- Device Shimadzu Corporation LC-10A series column: Tosoh Corporation TSKgel G3000PWXL Mobile phase: 100 mmol / L sodium chloride aqueous solution flow rate: 0.8 ml / min Temperature: 40 ° C Detection: Differential Refractometer.
- Example 1 100 g of an autoclave: ⁇ -caprolactam (special grade manufactured by Wako Pure Chemical Industries, Ltd., SP value 19.5) 4 g, polyethylene glycol (Wako Pure Chemical Industries, Ltd., primary grade polyethylene glycol 6,000, molecular weight 7,700, SP value 21.3) 6 g, 10 g of water was added for hydrolysis, and after sealing, the atmosphere was replaced with nitrogen to 10 kg / cm 2 .
- the pressure of the system was adjusted to 0.1 kg / cm 2 while releasing nitrogen, and then the temperature was raised to 240 ° C. In this case, after the pressure of the system it reached 10 kg / cm 2, pressure is controlled while steam was fine discharge pressure so as to maintain a 10 kg / cm 2.
- the pressure was released at a rate of 0.2 kg / cm 2 ⁇ min to initiate polymerization.
- the internal solution was homogeneously clear.
- the pressure in the system was lowered to 0 kg / cm 2 while raising the temperature to 255 ° C., and heating was maintained while flowing nitrogen for 3 hours at the same time as reaching 0 kg / cm 2 to complete the polymerization.
- the internal solution was suspended. Nitrogen was again charged to 10 kg / cm 2 and allowed to cool to room temperature. Water was added to the obtained solid, and the mixture was heated to 80 ° C. to dissolve the melt.
- the obtained slurry liquid was filtered, 40 g of water was added to the filter, and washing was performed at 80 ° C.
- the slurry after removing the aggregate which passed through a 200 ⁇ m sieve was separated again by filtration and dried at 80 ° C. for 12 hours to obtain 2.8 g of a powder.
- aggregates of more than 200 ⁇ m were not present.
- the melting point of the obtained powder was 214 ° C. similar to that of polyamide 6, the crystallization temperature was 172 ° C., and the molecular weight was 38,000.
- polyamide 6 powder is in the shape of fine spheres of spherical particles, number average particle diameter is 6.6 ⁇ m, particle diameter distribution index is 1.08, sphericity is 96, linseed oil absorption amount is 57 mL / 100 g, BET specific surface area was 1.0 m 2 / g.
- the SP value of polyamide 6 is 21.9.
- a scanning electron micrograph (magnification ⁇ 3000) of the true sphere polyamide 6 fine particles is shown in FIG.
- the properties of the obtained polyamide 6 fine particles are shown in Table 1.
- Example 2 Polymerization was carried out in the same manner as in Example 1 except that 5 g of ⁇ -caprolactam and 5 g of polyethylene glycol (primary polyethylene glycol 6,000 manufactured by Wako Pure Chemical Industries, Ltd.) were changed to 0.7 g of powder. . It was a homogeneous solution at the start of polymerization, and a suspended solution after polymerization. The melting point of the obtained powder was 216 ° C. similar to that of polyamide 6, the crystallization temperature was 169 ° C., and the molecular weight was 44,100.
- polyethylene glycol primary polyethylene glycol 6,000 manufactured by Wako Pure Chemical Industries, Ltd.
- polyamide 6 powder is spheric and has a smooth surface with fine particle shape, number average particle diameter is 12.9 ⁇ m, particle diameter distribution index is 1.76, sphericity is 95, linseed oil absorption amount is It was 54 mL / 100 g.
- a scanning electron micrograph (magnification ⁇ 1000) of the true sphere polyamide 6 fine particles is shown in FIG.
- the properties of the obtained polyamide 6 fine particles are shown in Table 1.
- Example 3 Polymerization was carried out in the same manner as in Example 1 except that 2 g of ⁇ -caprolactam and 8 g of polyethylene glycol (primary polyethylene glycol 6,000 manufactured by Wako Pure Chemical Industries, Ltd.) were changed to obtain 1.5 g of powder. . It was a homogeneous solution at the start of polymerization, and a suspended solution after polymerization. The obtained powder had a melting point of 213 ° C. similar to that of polyamide 6, a crystallization temperature of 172 ° C., and a molecular weight of 26,800.
- polyamide 6 powder is a true sphere and is in the form of smooth particles with a number average particle diameter of 5.3 ⁇ m, a particle diameter distribution index of 1.24, a sphericity of 95, linseed oil absorption It was 59 mL / 100 g.
- the properties of the obtained polyamide 6 fine particles are shown in Table 1.
- polyamide 6 powder is spherical and has a smooth surface and fine particle shape, number average particle diameter is 3.5 ⁇ m, particle diameter distribution index is 1.15, sphericity is 93, linseed oil absorption amount Was 59 mL / 100 g.
- the properties of the obtained polyamide 6 fine particles are shown in Table 1.
- Example 6 The polymerization is carried out in the same manner as in Example 1 except that polyethylene glycol different in molecular weight (1st grade polyethylene glycol 2,000, molecular weight 2,300, SP value 21.3 manufactured by Wako Pure Chemical Industries, Ltd.) is used, and polymerization is carried out in the same manner. Was obtained 2.3 g.
- polyamide 6 powder is spherical and has a smooth surface with fine particle shape, number average particle diameter is 6.1 ⁇ m, particle diameter distribution index is 1.34, sphericity is 93, linseed oil absorption amount was 53 mL / 100 g.
- the properties of the obtained polyamide 6 fine particles are shown in Table 1.
- Example 7 Polymerization was carried out in the same manner as in Example 1 except that polyethylene glycol was changed to polypropylene glycol (primary polypropylene glycol 2,000, molecular weight 3,600, SP value 18.7 manufactured by Wako Pure Chemical Industries, Ltd.), and powder was used. Was obtained 2.3 g. It was a homogeneous solution at the start of polymerization, and a suspended solution after polymerization. The melting point of the obtained powder was 216 ° C. similar to that of polyamide 6, the crystallization temperature was 170 ° C., and the molecular weight was 38,000.
- Example 8 The polymerization was carried out in the same manner as in Example 1 except that polyethylene glycol was changed to polytetramethylene glycol (primary grade polytetramethylene glycol 2,000, molecular weight 7,500, SP value 17.9 manufactured by Wako Pure Chemical Industries, Ltd.) To obtain 2.3 g of powder. It was a homogeneous solution at the start of polymerization, and a suspended solution after polymerization. The melting point of the obtained powder was 214 ° C. similar to that of polyamide 6, the crystallization temperature was 169 ° C., and the molecular weight was 40,200.
- polytetramethylene glycol primary grade polytetramethylene glycol 2,000, molecular weight 7,500, SP value 17.9 manufactured by Wako Pure Chemical Industries, Ltd.
- Example 9 In a 100 mL autoclave, 1.7 g of adipic acid (manufactured by Tokyo Chemical Industry Co., Ltd., SP value 25.4), 2.2 g of a 50% aqueous solution of hexamethylene diamine (manufactured by Tokyo Chemical Industry Co., Ltd., SP value 19.2), polyethylene glycol 6 g of (primary grade polyethylene glycol 20,000, molecular weight 18, 600 manufactured by Wako Pure Chemical Industries, Ltd.), 2.6 g of water as a solvent, and after sealing, nitrogen was substituted to 10 kg / cm 2 . The pressure of the system was adjusted to 0.1 kg / cm 2 while releasing nitrogen, and then the temperature was raised to 260 ° C.
- the slurry after removing the aggregate which passed through a 200 ⁇ m sieve was separated again by filtration and dried at 80 ° C. for 12 hours to obtain 2.3 g of a powder.
- aggregates of more than 200 ⁇ m were not present.
- the obtained powder had a melting point of 267 ° C. similar to that of polyamide 66, a crystallization temperature of 211 ° C., and a molecular weight of 73,600.
- the polyamide 66 powder has a spherical shape and a fine particle shape with a smooth surface, a number average particle diameter of 6.5 ⁇ m, a particle diameter distribution index of 1.60, a sphericity of 91, and linseed oil oil absorption The amount was 56 mL / 100 g.
- a scanning electron micrograph (magnification ⁇ 1500) of the true sphere polyamide 66 fine particles is shown in FIG.
- the SP value of polyamide 66 is 20.6.
- the properties of the obtained polyamide 66 fine particles are shown in Table 2.
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Abstract
Description
ポリアミドの単量体(A)をポリマー(B)の存在下、得られるポリアミドの結晶化温度以上で重合しポリアミド微粒子を製造する方法であって、重合開始時にポリアミドの単量体(A)とポリマー(B)が均一に溶解しており、重合後にポリアミド微粒子が析出するポリアミド微粒子の製造方法、である。
数平均粒子径が0.1~100μm、真球度が90以上、粒子径分布指数が3.0以下、アマニ油吸油量が100mL/100g以下、結晶化温度が150℃以上であるポリアミド微粒子、である。
ポリアミド微粒子の数平均粒子径は、走査型電子顕微鏡写真から無作為に100個の粒子直径を特定し、その算術平均を求めることにより算出した。上記写真において、真円状でない場合、即ち楕円状のような場合は、粒子の最大径をその粒子径とした。また粒子径分布指数は、上記で得られた粒子径の値を、下記数値変換式に基づき算出した。
ポリアミド微粒子の真球度は、走査型電子顕微鏡写真から無作為に30個の粒子を観察し、その短径と長径から下記数式に従い算出した。
日本工業規格(JIS規格)JISK5101“顔料試験方法 精製あまに油法”に準じ、ポリアミド微粒子約100mgを時計皿の上に精秤し、精製アマニ油(関東化学株式会社製)をビュレットで1滴ずつ徐々に加え、パレットナイフで練りこんだ後に、試料の塊ができるまで滴下-練りこみを繰り返し、ペーストが滑らかな硬さになった点を終点とし、滴下に使用した精製アマニ油の量から吸油量(mL/100g)を算出した。
日本工業規格(JIS規格)JISR1626(1996)“気体吸着BET法による比表面積の測定方法”に従い、日本ベル製BELSORP-maxを用いて、ポリアミド微粒子約0.2gをガラスセルに入れ、80℃で約5時間減圧脱気した後に、液体窒素温度におけるクリプトンガス吸着等温線を測定し、BET法により算出した。
TAインスツルメント社製示差走査熱量計(DSCQ20)を用いて、窒素雰囲気下、30℃からポリアミドの融点を示す吸熱ピークから30℃高い温度まで20℃/分の速度で昇温した後に1分間保持し、20℃/分の速度で30℃まで温度を冷却させる際に出現する発熱ピークの頂点を結晶化温度とした。冷却後、さらに20℃/分で昇温した際の吸熱ピークを融点とした。測定に要したポリアミド微粒子は約8mgである。
ポリアミドの重量平均分子量は、ゲルパーミエーションクロマトグラフィー法を用い、ポリメチルメタクリレートによる校正曲線と対比させて分子量を算出した。測定サンプルは、ポリアミド微粒子約3mgをヘキサフルオロイソプロパノール約3gに溶解し調整した。
装置:Waters e-Alliance GPC system
カラム:昭和電工株式会社製HFIP-806M×2
移動相:5mmol/Lトリフルオロ酢酸ナトリウム/ヘキサフルオロイソプロパノール
流速:1.0ml/min
温度:30℃
検出:示差屈折率計。
ポリマー(B)の重量平均分子量は、ゲルパーミエーションクロマトグラフィー法を用い、ポリエチレングリコールによる校正曲線と対比させて分子量を算出した。測定サンプルは、ポリマー(B)約3mgを水約6gに溶解し調整した。
装置:株式会社島津製作所製 LC-10Aシリーズ
カラム:東ソー株式会社製TSKgelG3000PWXL
移動相:100mmol/L塩化ナトリウム水溶液
流速:0.8ml/min
温度:40℃
検出:示差屈折率計。
100mLのオートクレーブにε―カプロラクタム(和光純薬工業株式会社製特級、SP値19.5)4g、ポリエチレングリコール(和光純薬工業株式会社製1級ポリエチレングリコール6,000、分子量7,700、SP値21.3)6g、加水分解用に水10gを加え密封後、窒素で10kg/cm2まで置換した。窒素を放出させながら系の圧力を0.1kg/cm2に調整後、温度を240℃まで昇温させた。この際、系の圧力が10kg/cm2に達した後、圧が10kg/cm2を維持するよう水蒸気を微放圧させながら制御した。温度が240℃に達した後に、0.2kg/cm2・分の速度で放圧させ重合を開始した。この時点で内溶液は均一透明であった。温度を255℃まで上昇させながら系内の圧力を0kg/cm2にまで低下させ、0kg/cm2になると同時に窒素を3時間流しながら加熱を維持し重合を完了させた。なお重合後は、内溶液が懸濁していた。窒素を再度10kg/cm2まで充填後、室温まで冷却させた。得られた固形物に水を加え80℃に加熱し、溶解物を溶かした。得られたスラリー液のろ過を行い、ろ上物に水40gを加え、80℃で洗浄を行った。その後200μmの篩を通過させた凝集物を除いたスラリー液を、再度ろ過して単離したろ上物を80℃で12時間乾燥させ、粉末を2.8g得た。また、200μm超の凝集物は存在しなかった。得られた粉末の融点はポリアミド6と同様の214℃、結晶化温度は172℃であり、分子量は38,000であった。また走査型電子顕微鏡観察からポリアミド6粉末は真球の微粒子形状であり、数平均粒子径は6.6μm、粒子径分布指数は1.08、真球度は96、アマニ油吸油量は57mL/100g、BET比表面積は1.0m2/gであった。なおポリアミド6のSP値は、21.9である。該真球ポリアミド6微粒子の走査型電子顕微鏡写真(倍率×3000)を図1に示す。また、得られたポリアミド6微粒子の特性を表1に示す。
ε―カプロラクタムを5g、ポリエチレングリコール(和光純薬工業株式会社製1級ポリエチレングリコール6,000)を5gに変更した以外は実施例1と同様の方法で重合を行い、粉末を0.7g得た。重合開始時点では均一溶液、重合後は懸濁溶液であった。得られた粉末の融点はポリアミド6と同様の216℃、結晶化温度は169℃であり、分子量は44,100であった。また走査型電子顕微鏡観察からポリアミド6粉末は真球で表面平滑な微粒子形状であり、数平均粒子径は12.9μm、粒子径分布指数1.76、真球度は95、アマニ油吸油量は54mL/100gであった。該真球ポリアミド6微粒子の走査型電子顕微鏡写真(倍率×1000)を図2に示す。また、得られたポリアミド6微粒子の特性を表1に示す。
ε―カプロラクタムを2g、ポリエチレングリコール(和光純薬工業株式会社製1級ポリエチレングリコール6,000)を8gに変更した以外は実施例1と同様の方法で重合を行い、粉末を1.5g得た。重合開始時点では均一溶液、重合後は懸濁溶液であった。得られた粉末の融点はポリアミド6と同様の213℃、結晶化温度は172℃であり、分子量は26,800であった。また走査型電子顕微鏡観察からポリアミド6粉末は真球で表面平滑な微粒子形状であり、数平均粒子径は5.3μm、粒子径分布指数1.24、真球度は95、アマニ油吸油量は59mL/100gであった。また、得られたポリアミド6微粒子の特性を表1に示す。
分子量の異なるポリエチレングリコール(和光純薬工業株式会社製1級ポリエチレングリコール20,000、分子量18,600、SP値21.3)に変更した以外は実施例1と同様の方法で重合を行い、粉末を3.3g得た。重合後は均一溶液、重合終了時点では懸濁溶液であった。得られた粉末の融点はポリアミド6と同様の211℃、結晶化温度は170℃であり、分子量は35,600であった。また走査型電子顕微鏡観察からポリアミド6粉末は真球で表面平滑な微粒子形状であり、数平均粒子径は6.1μm、粒子径分布指数は1.23、真球度は92、アマニ油吸油量は60mL/100gであった。また、得られたポリアミド6微粒子の特性を表1に示す。
分子量の異なるポリエチレングリコール(和光純薬工業株式会社製1級ポリエチレングリコール35,000、分子量31,000、SP値21.3)に変更した以外は実施例1と同様の方法で重合を行い、粉末を2.1g得た。重合開始時点では均一溶液、重合後は懸濁溶液であった。得られた粉末の融点はポリアミド6と同様の210℃、結晶化温度は175℃であり、分子量は32,500であった。また走査型電子顕微鏡観察からポリアミド6粉末は真球で表面平滑な微粒子形状であり、数平均粒子径は3.5μm、粒子径分布指数は1.15、真球度は93、アマニ油吸油量は59mL/100gであった。また、得られたポリアミド6微粒子の特性を表1に示す。
[実施例6]
分子量の異なるポリエチレングリコール(和光純薬工業株式会社製1級ポリエチレングリコール2,000、分子量2,300、SP値21.3)に変更した以外は実施例1と同様の方法で重合を行い、粉末を2.3g得た。重合開始時点では均一溶液、重合後は懸濁溶液であった。得られた粉末の融点はポリアミド6と同様の212℃、結晶化温度は171℃であり、分子量は41,700であった。また走査型電子顕微鏡観察からポリアミド6粉末は真球で表面平滑な微粒子形状であり、数平均粒子径は6.1μm、粒子径分布指数は1.34、真球度は93、アマニ油吸油量は53mL/100gであった。また、得られたポリアミド6微粒子の特性を表1に示す。
ポリエチレングリコールをポリプロピレングリコール(和光純薬工業株式会社製1級ポリプロピレングリコール2,000、分子量3,600、SP値18.7)に変更した以外は実施例1と同様の方法で重合を行い、粉末を2.3g得た。重合開始時点では均一溶液、重合後は懸濁溶液であった。得られた粉末の融点はポリアミド6と同様の216℃、結晶化温度は170℃であり、分子量は38,000であった。また走査型電子顕微鏡観察からポリアミド6粉末は真球で表面平滑な微粒子形状であり、数平均粒子径は21.5μm、粒子径分布指数は1.92、真球度は91、アマニ油吸油量は65mL/100gであった。また、得られたポリアミド6微粒子の特性を表1に示す。
ポリエチレングリコールをポリテトラメチレングリコール(和光純薬工業株式会社製1級ポリテトラメチレングリコール2,000、分子量7,500、SP値17.9)に変更した以外は実施例1と同様の方法で重合を行い、粉末を2.3g得た。重合開始時点では均一溶液、重合後は懸濁溶液であった。得られた粉末の融点はポリアミド6と同様の214℃、結晶化温度は169℃であり、分子量は40,200であった。また走査型電子顕微鏡観察からポリアミド6粉末は真球で表面平滑な微粒子形状であり、数平均粒子径は31.5μm、粒子径分布指数は2.76、真球度は90、アマニ油吸油量は63mL/100gであった。また、得られたポリアミド6微粒子の特性を表1に示す。
100mLのオートクレーブにアジピン酸1.7g(東京化成工業株式会社製、SP値25.4)、ヘキサメチレンジアミン50%水溶液2.2g(東京化成工業株式会社製、SP値19.2)、ポリエチレングリコール(和光純薬工業株式会社製1級ポリエチレングリコール20,000、分子量18,600)6g、溶媒として水2.6gを加え密封後、窒素で10kg/cm2まで置換した。窒素を放出させながら系の圧力を0.1kg/cm2に調整後、温度を260℃まで昇温させた。この際、系の圧力が17.5kg/cm2に達した後、圧が17.5kg/cm2を維持するよう微放圧させながら制御した。温度が260℃に達した後に、0.6kg/cm2・分の速度で放圧させ重合を開始した。この時点で内溶液は均一透明であった。温度を280℃まで上昇させながら系内の圧力を0にまで低下させ、0になると同時に窒素を1時間流しながら加熱を維持し重合を完了させた。なお重合後は、内溶液が懸濁していた。得られたスラリー液のろ過を行い、ろ上物に水40gを加え、80℃で洗浄を行った。その後200μmの篩を通過させた凝集物を除いたスラリー液を、再度ろ過して単離したろ上物を80℃で12時間乾燥させ、粉末を2.3g得た。また、200μm超の凝集物は存在しなかった。得られた粉末の融点はポリアミド66と同様の267℃、結晶化温度は211℃であり、分子量は73,600であった。また操走査型電子顕微鏡観察からポリアミド66粉末は真球で表面平滑な微粒子形状であり、数平均粒子径は6.5μm、粒子径分布指数は1.60、真球度は91、アマニ油吸油量は56mL/100gであった。該真球ポリアミド66微粒子の走査型電子顕微鏡写真(倍率×1500)を図3に示す。なおポリアミド66のSP値は、20.6である。また、得られたポリアミド66微粒子の特性を表2に示す。
100mLのオートクレーブにアミノヘキサン酸(和光純薬工業株式会社製、SP値17.5)4g、ポリエチレングリコール(和光純薬工業株式会社製1級ポリエチレングリコール6,000)6g、溶媒として水10gを加え均一な溶液を形成後に密封し、窒素で10kg/cm2まで置換した。窒素を放出させながら系の圧力を0.1kg/cm2に調整後、温度を240℃まで昇温させた。この際、系の圧力が10kg/cm2に達した後、圧が10kg/cm2を維持するよう水蒸気を微放圧させながら制御した。温度が240℃に達した後に、0.2kg/cm2・分の速度で放圧させ重合を開始した。温度を255℃まで上昇させながら系内の圧力を0にまで低下させ、0になると同時に窒素を3時間流しながら加熱を維持し重合を完了させた。なお重合後は、内溶液が懸濁していた。窒素を再度10kg/cm2まで充填後、室温まで冷却させた。得られた固形物に水を加え80℃に加熱し、溶解物を溶かした。得られたスラリー液のろ過を行い、ろ上物に水40gを加え、80℃で洗浄を行った。その後200μmの篩を通過させた凝集物を除いたスラリー液を、再度ろ過して単離したろ上物を80℃で12時間乾燥させ、粉末を1.4g得た。また、200μm超の凝集物は存在しなかった。得られた粉末の融点はポリアミド6と同様の216℃、結晶化温度は170℃であり、分子量は21,000であった。また走査型電子顕微鏡観察からポリアミド6粉末は真球の微粒子形状であり、数平均粒子径は13.1μm、粒子径分布指数は1.54、真球度は92、アマニ油吸油量は60mL/100gであった。また、得られたポリアミド6微粒子の特性を表2に示す。
アミノヘキサン酸をアミノドデカン酸(和光純薬工業株式会社製、SP値17.2)、分子量の異なるポリエチレングリコール(和光純薬工業株式会社製1級ポリエチレングリコール20,000)に変更した以外は実施例10と同様の方法で重合を行い、粉末を0.8g得た。なお温度を100℃以上に昇温した時点から均一な溶液を形成し、重合後は懸濁溶液であった。得られた粉末の融点はポリアミド12と同様の173℃、結晶化温度は139℃であり、分子量は110,00であった。また走査型電子顕微鏡観察からポリアミド12粉末は真球で表面平滑な微粒子形状であり、数平均粒子径は6.6μm、粒子径分布指数1.37、真球度は94、アマニ油吸油量は54mL/100gであった。該真球ポリアミド12微粒子の走査型電子顕微鏡写真(倍率×1000)を図4に示す。また、得られたポリアミド12微粒子の特性を表2に示す。
アミノドデカン酸を2g、ポリエチレングリコールを8gに変更した以外は実施例11と同様の方法で重合を行い、粉末を1.2g得た。得られた粉末の融点はポリアミド12と同様の175℃、結晶化温度は136℃であり、分子量は50,000であった。また走査型電子顕微鏡観察からポリアミド12粉末は真球で表面平滑な微粒子形状であり、数平均粒子径は6.0μm、粒子径分布指数1.30、真球度は96、アマニ油吸油量は58mL/100gであった。また、得られたポリアミド12微粒子の特性を表2に示す。
ポリエチレングリコールをジメチルシリコーンオイル(信越化学工業株式会社製KF-96H、10,000cs、分子量88,400、SP値14.5)、洗浄時の水をトルエンに変更した以外は実施例1と同様の方法で重合を行った。重合開始時点で2相に分離しており、重合後はシリコーンとポリアミドの2相に粗大分離したままであった。トルエンを使用して洗浄を行ったが、200μm超にポリアミド凝集物が3.2g回収され、粒子は得られなかった。
ポリエチレングリコールをポリスチレン(アルドリッチ株式会社製ポリスチレンMw=280,000、分子量278,400、SP値16.6)、洗浄時の水をトルエンに変更した以外は実施例1と同様の方法で重合を行った。重合開始時点で2相に分離しており、重合後はポリスチレンとポリアミドの2相に粗大分離したままであった。トルエンを使用して洗浄を行ったが、200μm超にポリアミド凝集物が3.3g回収され、粒子は得られなかった。
撹拌機を備え付けた反応容器に流動パラフィン355mL、ε-カプロラクタム109g、N,N‘-エチレンビスアデアラアミド0.6g、微細シリカ0.5gを加え、650rpmで撹拌した。容器を100℃まで加熱し200トルの真空下で流動パラフィン31mLを留去させ、残存水分を取り除いた。系を大気圧に戻した後に、窒素流入下で水素化ナトリウム0.5gを加え密封後、60分間撹拌した。温度を110℃に昇温後、1時間かけて温度を130℃まで昇温させ重合を開始すると同時に、ステアリルイソシアネート2.9gを0.02g/分の速度で系中にポンプを介して送液した。なお、重合開始時点で溶液は懸濁していた。重合は、130℃まで昇温後に2時間維持して重合を完了させた。温度を室温まで冷却後に、トルエンで流動パラフィンを洗浄後に、粉末を85g得た。得られた粉末の融点はポリアミド6と同様の210℃、結晶化温度は165℃であり、分子量は34,400であった。また操作型電子顕微鏡観察からポリアミド6粉末は不定形の微粒子であり、数平均粒子径は18.0μm、粒度分布指数は1.30、真球度は68であった。該不定形ポリアミド6微粒子の走査型電子顕微鏡写真(倍率×1000)を図5に示す。また、得られたポリアミド6微粒子の特性を表2に示す。
水を使用しないこと以外は実施例10と同様の方法で重合を行ったが、重合開始時点で2相に分離しており、重合後はポリアミド6とポリエチレングリコールの2相に粗大分離し、ポリアミド6粒子は得られなかった。
水を使用しないこと以外は実施例11と同様の方法で重合を行ったが、重合開始時点で2相に分離しており、重合後はポリアミド12とポリエチレングリコールの2相に粗大分離し、ポリアミド12粒子は得られなかった。
Claims (10)
- ポリアミドの単量体(A)をポリマー(B)の存在下、得られるポリアミドの結晶化温度以上で重合しポリアミド微粒子を製造する方法であって、重合開始時にポリアミドの単量体(A)とポリマー(B)が均一に溶解しており、重合後にポリアミド微粒子が析出するポリアミド微粒子の製造方法。
- 更に単量体(A)とポリマー(B)の溶媒(C)の存在下でポリアミド微粒子を製造する請求項1記載のポリアミド微粒子の製造方法。
- 単量体(A)とポリマー(B)の溶解度パラメーター差の二乗が0.1~25、かつポリアミドとポリマー(B)の溶解度パラメーター差の二乗が0.1~16の範囲である請求項1または2記載のポリアミド微粒子の製造方法。
- 溶媒(C)が水である請求項2または3記載のポリアミド微粒子の製造方法。
- ポリマー(B)が、極性基を有しない、または水酸基および水硫基から選ばれるいずれかを有するものである請求項1~4のいずれか記載のポリアミド微粒子の製造方法。
- ポリマー(B)が、ポリエチレングリコール、ポリプロピレングリコール、ポリテトラメチレングリコール、ポリエチレングリコール-ポリプロピレングリコール共重合体、およびこれらのアルキルエーテル体である請求項1~5のいずれか記載のポリアミド微粒子の製造方法。
- ポリマー(B)の重量平均分子量が、500~500,000である請求項1~6のいずれか記載のポリアミド微粒子の製造方法。
- 数平均粒子径が0.1~100μm、真球度が90以上、粒子径分布指数が3.0以下、アマニ油吸油量が100mL/100g以下、結晶化温度が150℃以上であるポリアミド微粒子。
- ポリアミド微粒子を構成するポリアミドが、ポリアミド6、ポリアミド66、及びそれらの共重合体から選ばれるいずれかである請求項8記載のポリアミド微粒子。
- ポリアミド微粒子を構成するポリアミドの重量平均分子量が、8,000以上である請求項8または9記載のポリアミド微粒子。
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