Composite particles that are biodegradable and easy to handle while maintaining the characteristics of cellulose nanofibers, a method of producing composite particles, a dry powder containing the composite particles, and a skin application composition and a method of producing the skin application composition. A composite particle contains at least one type of particle and fine cellulose with which at least part of a surface of the particle is coated, wherein the particle and the fine cellulose are inseparable.

Composite particles that are biodegradable and easy to handle while maintaining the characteristics of cellulose nanofibers, a method of producing composite particles, a dry powder containing the composite particles, and a skin application composition and a method of producing the skin application composition. A composite particle contains at least one type of particle and fine cellulose with which at least part of a surface of the particle is coated, wherein the particle and the fine cellulose are inseparable.

Disclosed a method of preparing composite particles comprising a non-porous spherical particulate inorganic material deposited on a plate-like inorganic material, where refractive index of said particulate inorganic material is greater than that of said plate-like inorganic particulate material, wherein, said spherical material occupies 20 to 80% of total surface area of said plate-like material and wherein the amount of said spherical material accounts for 2 to 20 wt % of said composite particles, further wherein said plate-like inorganic material is mica and said non-porous spherical particulate inorganic material is silicone dioxide, said method comprising the steps of: (iv) silanization of said plate-like inorganic material to get a silanized material having functional groups “A”; (v) silanization of said non-porous spherical particulate inorganic material to get a silanized material having functional groups “B”, where A≠B; and where said “A” and said “B” are capable of reacting with each other such that by way of their reaction, said non-porous spherical particulate inorganic material deposits on said plate-like inorganic material; and, (vi) reacting said silanized material having functional groups “A” with said silanized material having functional groups “B”.

Disclosed a method of preparing composite particles comprising a non-porous spherical particulate inorganic material deposited on a plate-like inorganic material, where refractive index of said particulate inorganic material is greater than that of said plate-like inorganic particulate material, wherein, said spherical material occupies 20 to 80% of total surface area of said plate-like material and wherein the amount of said spherical material accounts for 2 to 20 wt % of said composite particles, further wherein said plate-like inorganic material is mica and said non-porous spherical particulate inorganic material is silicone dioxide, said method comprising the steps of: (iv) silanization of said plate-like inorganic material to get a silanized material having functional groups “A”; (v) silanization of said non-porous spherical particulate inorganic material to get a silanized material having functional groups “B”, where A≠B; and where said “A” and said “B” are capable of reacting with each other such that by way of their reaction, said non-porous spherical particulate inorganic material deposits on said plate-like inorganic material; and, (vi) reacting said silanized material having functional groups “A” with said silanized material having functional groups “B”.

A powder cosmetic containing: an inorganic powder; and a polyaspartic acid alkali metal salt that coats a part or all of a surface of the inorganic powder, in which a weight average molecular weight x of the polyaspartic acid alkali metal salt is from 1,000 to 150,000, and the weight average molecular weight x of the polyaspartic acid alkali metal salt and a mass ratio y of the polyaspartic acid alkali metal salt to a total amount of the inorganic powder and the polyaspartic acid alkali metal salt satisfy the following relationships: y≤1.6×10.sup.7x.sup.−2.275 and y≥1.3×10.sup.5x.sup.−2.232.

A powder cosmetic containing: an inorganic powder; and a polyaspartic acid alkali metal salt that coats a part or all of a surface of the inorganic powder, in which a weight average molecular weight x of the polyaspartic acid alkali metal salt is from 1,000 to 150,000, and the weight average molecular weight x of the polyaspartic acid alkali metal salt and a mass ratio y of the polyaspartic acid alkali metal salt to a total amount of the inorganic powder and the polyaspartic acid alkali metal salt satisfy the following relationships: y≤1.6×10.sup.7x.sup.−2.275 and y≥1.3×10.sup.5x.sup.−2.232.

The invention relates to a cosmetic containing fatty acid magnesium salt particles and mica in which the fatty acid magnesium salt particles have a fatty acid having 12 to 22 carbon atoms, an aspect ratio expressed by the following formula (1) of 1.0 or more and 2.0 or less and an average thickness of 250 to 600 nm.

Aspect Ratio=Major axis diameter of Particle (μm)/Minor axis diameter of Particle (μm)  formula (1)

A cellulosic particle contains cellulose as its base constituent, and the 5-day and 60-day percentage biodegradations of the cellulosic particle measured as per JIS K6950:2000 are lower than 20% and 60% or higher, respectively.

A cellulosic particle contains cellulose as its base constituent, and the 5-day and 60-day percentage biodegradations of the cellulosic particle measured as per JIS K6950:2000 are lower than 20% and 60% or higher, respectively.

Provided is a white pigment for cosmetics capable of giving a cosmetic having an excellent performance smoothly applicable onto the skin. A white pigment for cosmetics of the present invention includes a titanium phosphate powder, the titanium phosphate powder includes crystal particles of titanium phosphate, and the titanium phosphate powder has an average friction coefficient (MIU) of less than 1.45.