Patent ID: 8293279

Claim:
A method of making a fine polyamide powder suitable for a cosmetic application, the method comprising adding from 0.01 to 2 parts of a buffer system per 100 parts of polyamide, wherein the buffer system comprises at least one of a natural organic acid, a natural mineral acid, and a corresponding salt thereof, and polyamide powder in a manner to yield a uniform distribution of the buffer system with the polyamide powder, wherein the resulting fine polyamide powder is suitable for a cosmetic application and has a pH of from 4.0 to 7.0 which is the pH a suspension of 100 ml of water and 1 g of the fine polyamine powder measured after stirring the suspension for 24 hours, wherein the buffer system is dry and is mixed with a dry blend of the polyamide powder, and wherein the fine polyamide powder has an average particle diameter d 50 of from 1 to 400 μm.