Composition and method for producing same

A composition comprising:

• particles of a cellulose derivative;
• and
• a surface treatment compound,
• wherein
• the particles of the cellulose derivative have an average particle size from 0.08 μm to 100 μm,
• the surface treatment compound is an inorganic powder, and
• the inorganic powder has an average particle size of ⅓ or less of the average particle size of the particles of the cellulose derivative.

A composition comprising:

• particles of a cellulose derivative;
• and
• a surface treatment compound,
• wherein
• the particles of the cellulose derivative have an average particle size from 0.08 μm to 100 μm,
• the surface treatment compound is an organic compound having a long-chain alkyl group and/or an inorganic powder,
• the inorganic powder has an average particle size of ⅓ or less of the average particle size of the particles of the cellulose derivative, and
• the cellulose derivative has an alkoxyl group having from 2 to 20 carbon atoms.