Silicone particles, and cosmetic, coating, and resin formulated using same
Silicone particles having excellent dispersibility are provided via the method herein. A cosmetic material having excellent feeling of use, and a highly functional paint and an electronic material are also provided. The silicone particles include a siloxane as a component. A content of a hydrogen atom bonded to a silicon atom per unit mass is 300 ppm or less, or optionally is 20 ppm or less. In addition, the silicon atom in the siloxane as a component for the silicone particles is crosslinked with another silicon atom via an alkylene group having a carbon number of 4 to 20.
1. A method for producing silicone particles, the method comprising:
emulsifying a crosslinkable composition; and
curing the crosslinkable composition in the presence of a catalyst;
wherein the crosslinkable composition comprises components (A) and (B) below:
(A) an organopolysiloxane having two or more alkenyl groups having 4 or more and 20 or less carbon atoms in one molecule; and
(B) a silicon organic compound having two or more hydrogen atoms bonded to the silicon atom in one molecule, with the hydrogen atoms being not more than 40% based on the number of silicon atoms in one molecule, and/or
a silicon organic compound having two or more hydrogen atoms bonded to the silicon atom in one molecule and having a trifunctional siloxane unit or a tetrafunctional siloxane unit;
wherein a molar ratio of a content of the alkenyl group (Alk) in component (A) to a content of the hydrogen atom (H) bonded to the silicon atom in component (B) is: H/Alk=0.7 to 1.2.
2. The method according to claim 1 , wherein the alkenyl group in component (A) has 4 or more and 12 or less carbon atoms.
3. The method according to claim 1 , wherein component (B) comprises the silicon organic compound having two or more hydrogen atoms bonded to the silicon atom in one molecule, with the hydrogen atoms being not more than 40% based on the number of silicon atoms in one molecule.
4. The method according to claim 1 , wherein component (B) comprises the silicon organic compound having two or more hydrogen atoms bonded to the silicon atom in one molecule and having a trifunctional siloxane unit or a tetrafunctional siloxane unit.
5. The method according to claim 1 , wherein the catalyst is (C) a hydrosilylation catalyst.
6. The method according to claim 1 , wherein the crosslinkable composition is emulsified in the presence of a surfactant.
7. The method according to claim 6 , wherein the crosslinkable composition is emulsified via an emulsifier.
8. The method according to claim 1 , wherein the H/Alk molar ratio is 0.9 to 1.1.
9. The method according to claim 1 , wherein the content of the hydrogen bonded to the silicon atom per unit mass is 300 ppm or less for the silicone particles produced via the method.
10. The method according to claim 9 , wherein the content of the hydrogen bonded to the silicon atom per unit mass is 20 ppm or less for the silicone particles produced via the method.
11. The method according to claim 1 , wherein a powder particle diameter is 1 to 50 μm as measured by a laser diffraction scattering method for the silicone particles produced via the method.
12. The method according to claim 1 , wherein a sheet formed via curing of the crosslinkable composition has a JIS-A hardness of 70 or less.
13. The method according to claim 1 , wherein a relationship between the JIS-A hardness (Vα) measured by curing in a sheet form the crosslinkable composition and a powder particle diameter measured by a laser diffraction scattering method (Vβ) satisfies: Vα×Vβ≤1,200.
14. Silicone particles formed according to the method of claim 1 .
15. The silicone particles according to claim 14 , wherein the content of the hydrogen bonded to the silicon atom per unit mass is 20 ppm or less.
16. The silicone particles according to claim 14 , which are a cosmetic raw material.
17. A cosmetic product comprising the silicone particles according to claim 16 .
18. The silicone particles according to claim 14 , which are a resin compounding agent.
19. A paint containing the silicone particles according to claim 18 .