| 摘要 |
A plate-like powder for cosmetics, powder is surface treated with a silicone gel, enhancing moldability and impact resistance of a solid powdery cosmetic composition as well as a solid powdery cosmetic composition. The surface-treated powder exhibits smooth and light touchiness, has moist usability, and excellent adhesion to skin. The surface-treated powder is blended into a powdery cosmetic composition, enhancing moldability and impact resistance of the composition and removed by an applicator. The powder is an inorganic powder, an organic powder or a composite powder, and silicone gel is obtained by hydrolyzing and condensing an organopolysiloxane containing at least a diorgano polysiloxane having reactive opposite ends by the following formula (1) and either a silane coupling agent of the following formula (2) having at least two hydrolyzable groups per one molecule or a reactive organo polysiloxane having the following formula (3) as a crosslinking agent
R1R22SiO—(R22SiO)L—SiR1R22 (1)R3R4nSiX(3-n) (2)R53SiO—(R52SiO)n-SiR53 (3). |
| 主权项 |
1. A plate-like powder for a cosmetic composition, said powder having particles with an average particle diameter in a range of from 0.01 to 700 μm as a starting material that are surface-treated with a 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):
(Chemical formula 1) R1R22SiO—(R22SiO)L—SiR1R22 (1) wherein R1 is a hydrolyzable group selected from the group consisting of a hydroxyl group, an amino group, an acetoxy group, an alkoxy group or a hydrogen atom, R2 is a non-substituted or substituted C1-C20 monovalent hydrocarbon group, and L is 3 to 10,000;
(Chemical formula 2)R3R4nSiX(3-n) (2) wherein R3 is selected from the group consisting of a C1-C20 monovalent hydrocarbon group, an amino group, an aminoethyl group, a mercapto group, an isocyanate and a phenyl group, R4 is selected from the group consisting of a phenyl group, a hydrogen atom, and a C1-C3 monovalent lower alkyl group, X is a hydroxyl group or an alkoxy group, and n is 0 or 1;
(Chemical formula 3)R53SiO—(R52SiO)n—SiR53 (3) wherein R5 is a hydrolyzable group or a non-substituted or substituted C1-C20 monovalent hydrocarbon group, the hydrolyzable group is a hydroxyl group, an amino group, an acetoxy group, an alkoxyl group or a hydrogen atom, n is 3 to 1,000, and at least three hydrolyzable groups are provided in one molecule, 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 the silicone gel 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 plate-like powder, the silicone gel has a complex modulus of 3,000 to 100,000 Pa and a loss coefficient tan δ of 1.0 to 2.5 in measurement of a dynamic viscoelasticity of a distortion factor of 17% at 25° C. and at 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. |
