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Composite particle and production method thereof

A technology of composite particles and particles, which is applied in the field of composite particles and its preparation, can solve the problems of insufficient magnetic particles, damage to the dispersion of magnetic particles, and difficulty in preventing seed particles from agglomerating each other in the polymerization process.

Inactive Publication Date: 2010-03-31
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, it is difficult to prevent the seed particles from agglomerating with each other in the polymerization process, and thus the magnetic particles become uneven in magnetite content from particle to particle, so that the magnetization tends to be non-uniform
Furthermore, there is a possibility that the agglomerated seed particles act as a ferromagnetic material, and thus there is a concern that the influence of residual magnetization impairs the dispersibility of the magnetic particles
[0006] From the viewpoint of the content of the magnetic material, the uniformity of magnetization, the particle size distribution and the dispersibility, the magnetic particles obtained by the above-mentioned preparation methods disclosed in the known literature are still insufficient, and therefore do not always have high practical application

Method used

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  • Composite particle and production method thereof
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preparation example Construction

[0014] The method for producing composite particles of the present invention is a method for producing composite particles each including a polymer compound and solid particles, and includes the following steps.

[0015] That is (1) mixing the first liquid containing the monomer and the organic solvent with the solid particles to obtain a mixed solution;

[0016] (2) mixing the mixed solution with a second liquid to form an emulsion;

[0017] (3) fractionating the first liquid from the dispersion of the emulsion; and

[0018] (4) Polymerize monomers remaining in the dispersoid after fractional distillation.

[0019] In the present invention, the first liquid includes at least one monomer and at least one organic solvent.

[0020] The monomer in the present invention can be used without any limitation as long as it is a polymerizable compound.

[0021] Specific examples of monomers used in radical polymerization include the following.

[0022] That is, polymerizable unsatur...

Embodiment 1

[0134] (Example 1) Preparation of Composite Particle 1

[0135] FeCl 3 and FeCl 2 Dissolve in water to prepare a dissolved solution. The dissolved solution was kept at room temperature and aqueous ammonia was added to the solution while stirring vigorously to prepare a suspension of magnetite.

[0136] Oleic acid was added to the suspension while stirring and the mixture was stirred at 70°C for 1 hour and at 110°C for 1 hour to prepare a slurry. The slurry was washed with a large amount of water, and then dried under reduced pressure to prepare a hydrophobic magnetite powder.

[0137] The obtained hydrophobic magnetite was evaluated by a transmission electron microscope (TEM), and the average particle diameter was 11 nm and the molecular weight distribution was 1.3.

[0138] Next, 2 g of styrene and 3 g of hydrophobic magnetite were weighed into 4 g of chloroform to prepare a chloroform mixed solution. On the other hand, 0.01 g of sodium dodecyl sulfate (SDS) was dissolve...

Embodiment 2

[0143] (Example 2) Preparation of Composite Particle 2

[0144] FeCl 3 and FeCl 2 Dissolve in water to prepare a dissolved solution. Aqueous ammonia was added to the dissolved solution while vigorously stirring to prepare a suspension of magnetite.

[0145] Oleic acid was added to the suspension while stirring and the mixture was stirred at 70°C for 1 hour and at 110°C for 1 hour to prepare a slurry. The slurry was washed with a large amount of water, and then dried under reduced pressure to prepare a hydrophobic magnetite powder.

[0146] The obtained hydrophobic magnetite was dispersed in chloroform and the dispersion was evaluated by DLS-8000 (manufactured by OTSUKA ELECTRONICS CO., LTD.), as a result of which the average particle diameter was 11 nm and the molecular weight distribution was 1.3.

[0147] 3 g of methyl methacrylate and 3 g of hydrophobic magnetite were weighed into 3 g of chloroform to prepare a chloroform mixed solution. On the other hand, 0.01 g of so...

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Abstract

There is provided a method of producing composite particles each comprising a polymer compound and solid particles, the method including: (1) mixing a first liquid containing a monomer and an organicsolvent with solid particles to prepare a mixed solution; (2) preparing a second liquid; (3) mixing the mixed solution with the second liquid to form an emulsion; (4) fractionating the first liquid from a dispersoid of the emulsion; and (5) polymerizing the monomer remaining in the dispersoid after the fractionation. Composite particles each comprising solid particles uniformly at a high ratio andhaving excellent size uniformity and dispersibility can be obtained thereby.

Description

technical field [0001] The present invention relates to composite particles applicable to a wide range of industrial fields including electronic materials, optical materials and medical materials and a method for preparing the composite particles. Background technique [0002] In recent years, research and development on composite particles have been actively carried out for the purpose of application to various industrial fields. For example, magnetic particles containing a polymer compound and a magnetic material are expected to have various applications, with particular attention focused on use as a substrate in the medical and diagnostic fields such as pharmaceuticals and diagnostic drugs. [0003] As a method for producing magnetic particles (hereinafter simply referred to as "magnetic particles") which are composite particles each containing a polymer compound and a magnetic material, methods using soap-free emulsion polymerization and microemulsion polymerization have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F2/22C08F2/44
CPCC08F2/22C08F2/44C08F292/00C08L51/10C08L2666/02
Inventor 中浜数理
Owner CANON KK