Patent ID: 9597269
Date: 2017-03-21
CPC Classifications: A61K,A61Q,C09C

Claim:
1. A method for producing a cosmetic powder surface-treated with a silicone gel, said method comprising: treating surfaces of particles of a powder having an average particle diameter in the range of from 0.01 to 500 μm as a starting material with the silicone gel by forming the silicone gel thereon in an in-situ method that comprises hydrolyzing and condensing an organopolysiloxane containing at least (i) a diorganopolysiloxane with reactive opposite ends expressed by the following formula (1) and (ii) at least one crosslinking agent selected from the group consisting of (a) a silane coupling agent having the following formula (2) and at least two hydrolyzable groups per one molecule and (b) a reactive organopolysiloxane of the following formula (3): wherein R wherein R wherein R a ratio between the diorganopolysiloxane with the reactive opposite ends and the crosslinking agent is in a compounding range of 100/0.1 to 100/35 wt %; and, thermally fixing the surface-treated cosmetic powder and pulverizing a resultant, wherein the silicone gel formed on the surfaces of the particles of the cosmetic powder has a finely three-dimensional crosslinking structure of the diorganopolysiloxane, and when the silicone gel is obtained by effecting the method in the absence of the powder, the obtained silicone gel has a complex modulus of 3,000 to 100,000 Pa and a loss coefficient tan δ is 1.0 to 2.5 in measurement of a dynamic viscoelasticity under a distortion factor of 17% at 25° C. and a shear frequency of 4 Hz, and a measured value of the silicone gel measured by a measuring method with a durometer AO is 0.