Composite particles and method of producing the same, personal care product, personal care particles and method of producing the same, personal care article, and personal care composition

A method of producing a composite particle, the method comprising the steps of:

• fibrillating one or both of a cellulose raw material and a chitin/chitosan raw material in a solvent to obtain a dispersion liquid of fine fibers that are at least either cellulose nanofibers or chitin nanofibers;
• dispersing a droplet containing a pore forming agent and a core material in the dispersion liquid, and coating a surface of the droplet with the fine fibers, the pore forming agent forming a pore when removed, the core material forming a core particle when solidified;
• solidifying the core material in the droplet to obtain a dispersion liquid of a core particle that contains the pore forming agent and whose surface is coated with the fine fibers;
• and
• collecting the core particle from the dispersion liquid of the core particle, and removing the pore forming agent from the collected core particle to form a pore in the core particle.

A method of producing a composite particle, the method comprising the steps of:

• fibrillating one or both of a cellulose raw material and a chitin/chitosan raw material in a solvent to obtain a dispersion liquid of fine fibers that are at least either cellulose nanofibers or chitin nanofibers;
• producing a W/O emulsion liquid in which a droplet containing a pore forming agent that forms a pore when removed is dispersed in a core material that forms a core particle when solidified, dispersing a droplet containing the W/O emulsion liquid in the dispersion liquid of the fine fibers, and coating a surface of the droplet containing the W/O emulsion liquid with the fine fibers to produce a W/O/W emulsion liquid;
• solidifying the core material in a droplet of the W/O/W emulsion liquid to obtain a dispersion liquid of a core particle that contains the droplet containing the pore forming agent and whose surface is coated with the fine fibers;
• and
• collecting the core particle from the dispersion liquid of the core particle, and removing the pore forming agent from the collected core particle to form a pore in the core particle.

A personal care particle comprising:

• a core particle made of a material containing a polymer;
• fine fibers made of at least either cellulose nanofibers or chitin nanofibers, the fine fibers being inseparably bonded to a surface of the core particle;
• and
• a functional material that is supported by the fine fibers and exhibits a personal care function.

A method of producing a personal care particle, the method comprising the steps of:

• fibrillating one or both of a cellulose raw material and a chitin/chitosan raw material in a solvent to obtain a dispersion liquid of fine fibers that are at least either cellulose nanofibers or chitin nanofibers;
• causing the fine fibers in the dispersion liquid of the fine fibers to support a functional material that exhibits a personal care function, thereby obtaining a dispersion liquid of the fine fibers supporting the functional material;
• dispersing a droplet containing a core material in the dispersion liquid of the fine fibers supporting the functional material, and coating a surface of the droplet with the fine fibers supporting the functional material;
• and
• solidifying the core material in the droplet coated with the fine fibers supporting the functional material.

A method of producing a personal care particle, the method comprising the steps of:

• fibrillating one or both of a cellulose raw material and a chitin/chitosan raw material in a solvent to obtain a dispersion liquid of fine fibers that are at least either cellulose nanofibers or chitin nanofibers;
• dispersing a droplet containing a core material in the dispersion liquid, and coating a surface of the droplet with the fine fibers;
• solidifying the core material in the droplet to obtain a dispersion liquid of a particle in which a surface of a core particle is coated with the fine fibers;
• and
• causing, in the dispersion liquid of the particle coated with the fine fibers, the fine fibers on the surface of the particle coated with the fine fibers to support a functional material that exhibits a personal care function.