JP-2026074482-A - Composite particles and their applications

Abstract

[Problem] The present invention aims to provide composite particles with high mechanical strength. [Solution] A composite particle comprising a thermoplastic resin (A) and inorganic particles (B), wherein the inorganic fixation rate is 50% or more. Preferably, the melting point of the thermoplastic resin (A) is 70 to 150°C. Preferably, the thermoplastic resin (A) comprises at least one selected from polyolefin resins, polyester resins, acrylic resins, and polyvinyl chloride resins. Preferably, the inorganic particles (B) comprises at least one selected from inorganic oxides, inorganic hydroxides, inorganic carbonates, clay minerals, inorganic chlorides, and inorganic phosphates. Preferably, the content of the inorganic particles (B) in the composite particle is 1 to 200 parts by weight per 100 parts by weight of the thermoplastic resin (A). [Selection Diagram] Figure 1

Inventors

• 古田 隼斗

Assignees

• 松本油脂製薬株式会社

Dates

Publication Date

20260507

Application Date

20241021

Claims (10)

1. A composite particle comprising a thermoplastic resin (A) and inorganic particles (B), wherein the inorganic fixation rate is 50% or more.
2. The composite particle according to claim 1, wherein the melting point of the thermoplastic resin (A) is 70 to 150°C.
3. The composite particle according to claim 1 or 2, wherein the thermoplastic resin (A) comprises at least one selected from polyolefin resins, polyester resins, acrylic resins, and polyvinyl chloride resins.
4. The composite particle according to claim 1 or 2, wherein the inorganic particle (B) comprises at least one selected from inorganic oxides, inorganic hydroxides, inorganic carbonates, clay minerals, inorganic chlorides, and inorganic phosphates.
5. The composite particle according to claim 1 or 2, wherein the content of the inorganic particles (B) in the composite particle is 1 to 200 parts by weight per 100 parts by weight of the thermoplastic resin (A).
6. The composite particle according to claim 1 or 2, wherein the ash content of the composite particle is 1 to 60% by weight.
7. The composite particle according to claim 1 or 2, wherein the volume-average particle diameter (D B50 ) of the inorganic particle (B) is 10 μm or less.
8. The composite particle according to claim 1 or 2, wherein the ratio (D 50 / D 50 ) of the volume-average particle diameter of the composite particle to the volume-average particle diameter (D 50 ) of the inorganic particle ( B ) is 2 or more.
9. A composition comprising the composite particles described in claim 1 or 2.
10. A cosmetic composition comprising the composite particles described in claim 1 or 2.

Description

This invention relates to composite particles and their applications. Traditionally, organic microparticles have been used as compounding agents in various products such as cosmetics, paints, and plastic products to enhance the slipperiness and light scattering properties of the products. One proposed method for enhancing the functionality of organic microparticles is the composite formation of organic and inorganic particles. This method is expected to yield composite particles possessing the characteristics of both organic and inorganic particles, thereby improving various properties such as stability, heat resistance, flame retardancy, chemical resistance, thermal conductivity, and pressure resistance. Patent Document 1 describes composite particles obtained by coating magnetic resin particles with thermally conductive inorganic particles using a high-speed airflow impact method, a mechanofusion method, or a mechanochemical method. Patent Document 2 describes a method for producing composite particles, which includes the steps of preparing a liquid containing polymer particles, inorganic particles, and a water-soluble polymer, and insolubilizing the water-soluble polymer to attach the inorganic particles to the surface of the polymer particles. Japanese Patent Publication No. 2012-124449Japanese Patent Publication No. 2006-052332 Electron microscope image of composite particle 1 of Example 1 The composite particles of the present invention are composite particles comprising a thermoplastic resin (A) and inorganic particles (B), wherein the inorganic fixation rate is 50% or more. The reason why the composite particles of the present invention have excellent mechanical strength is, although not particularly limited, thought to be because at least a portion of the inorganic particles (B) are incorporated into the thermoplastic resin (A). The composite particles of the present invention will be described below. [Thermoplastic resin (A)] The composite particles of the present invention include a thermoplastic resin (A). The thermoplastic resin (A) is not particularly limited, but examples include polyolefin resins, polyester resins, acrylic resins, polyvinyl chloride resins, polyurethane resins, polyether resins, polyamide resins, cellulose resins, etc. It is preferable that it contains at least one selected from polyolefin resins, polyester resins, acrylic resins, and polyvinyl chloride resins, is more preferable that it contains at least one selected from polyolefin resins and polyester resins, and is particularly preferable that it contains polyester resins. Examples of polyolefin resins include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-(meth)acrylic acid copolymer, ethylene-(meth)acrylic acid ester copolymer, low molecular weight polyolefin, and olefin-based elastomers. One or more of these may be used in combination. There are no particular limitations on the acrylic resin, but examples include (meth)acrylic acid esters and poly(meth)acrylic acid ester-(meth)acrylic acid copolymers. Examples of (meth)acrylic acid esters include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, n-pentyl (meth)acrylate, n-hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and 2-hydroxy (meth)acrylic acid ester, and one or more of these may be used in combination. Furthermore, nitrile monomers such as acrylonitrile, methacrylonitrile, fumaronitrile, and maleonitrile; vinyl halogenated monomers such as vinyl chloride; vinylidene halogenated monomers such as vinylidene chloride; vinyl ester monomers such as vinyl acetate, vinyl propionate, and vinyl butyrate; unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, ethacrylic acid, crotonic acid, and cinnamic acid; unsaturated dicarboxylic acids such as maleic acid, itaconic acid, fumaric acid, citraconic acid, and chloromaleic acid; anhydrides of unsaturated dicarboxylic acids; and unsaturated monocarboxylic acids such as monomethyl maleate, monoethyl maleate, monobutyl maleate, monomethyl fumarate, monoethyl fumarate, monomethyl itaconic acid, monoethyl itaconic acid, and monobutyl itaconic acid. Copolymers may be obtained by combining one or more of the following monomers: carboxyl group-containing monomers such as Japanese dicarboxylic acid monoesters; (meth)acrylamide monomers such as acrylamide, substituted acrylamide, methacrylamide, and substituted methacrylamide; maleimide monomers such as N-phenylmaleimide and N-cyclohexylmaleimide; styrene monomers such as styrene and α-methylstyrene; ethylene unsaturated monoolefin monomers such as ethylene, propylene, and isobutylene; vinyl ether monomers such as vinyl methyl ether, vinyl ethyl ether, and vinyl isobutyl ether; vinyl ketone monomers such as vinyl methyl ketone; N-vinyl monomers such as N-vinylcarbazole and N-vinylpyrrolidone; and vinylnaphthalene salts. In this invention, (meth)acrylic means acrylic or methacrylic. While there