Composite cured silicone powder and method for production thereof
View Patent ↗A composite cured silicone powder comprising: (A) a cured silicone powder having an average particle size of 0.1 to 500 μm, (B) an inorganic fine powder coated on the surface of said cured silicone powder and (C) a monohydric or polyhydric alcohol with a boiling point of at least 150° C. coating on the surface of component (A) and/or component (B). The composite cured silicone powder that has an excellent flowability, hydrophilicity, and dispersibility. And, this invention also relates to a production method of the composite, which is characterized by mixing components (A) to (C) under the condition of mechanical shearing.
1. A composite cured silicone powder comprising:
(A) a cured silicone powder having an average particle size of 0.1 to 500 μm;
(B) an inorganic fine powder coated on the surface of said cured silicone powder, and
(C) a monohydric or polyhydric alcohol with a boiling point of at least 150° C. and a viscosity at 25° C. of not more than 500 mPa·s uniformly coated on the surface of component (A) and/or component (B), component (C) being present in an amount of 2 to 20 mass parts per 100 mass parts of component (A), wherein component (C) is selected from the group consisting of 1,3-butanediol, 1,2-pentanediol, and dipropylene glycol.
2. The composite cured silicone powder according to claim 1 , wherein component (B) is a finely divided metal oxide powder.
3. The composite cured silicone powder according to claim 1 , wherein component (B) is selected form the group consisting of a silica fine powder, an alumina fine powder, and a titanium oxide fine powder.
4. The composite cured silicone powder according to claim 1 , wherein
component (A) is a silicone rubber powder having an average particle size of 0.1 to 200 μm;
component (B) is metal oxide fine powder; and
component (C) has a viscosity at 25° C. of not more than 200 mPa·s.
5. The composite cured silicone powder according to claim 1 , wherein component (B) is present in an amount of 2 to 30 mass parts per 100 mass parts of component (A).
6. The composite cured silicone powder according to claim 1 , wherein the viscosity of component (C) at 25° C. is not more than 200 mPa·s.
7. The composite cured silicone powder according to claim 1 , wherein component (C) is 1,3-butanediol.
8. The composite cured silicone powder according to claim 1 , wherein component (C) is uniformly attached to the surface of component (A).
9. A method of producing a composite cured silicone powder, said method comprising mixing the following components under conditions of mechanical shearing:
(A) a cured silicone powder with an average particle size of 0.1 to 500 μm,
(B) an inorganic fine powder, and
(C) a monohydric or polyhydric alcohol with a boiling point of at least 150° C. and a viscosity at 25° C. of not more than 500 mPa·s, component (C) being present in an amount of 2 to 20 mass parts per 100 mass parts of component (A), wherein component (C) uniformly coats on the surface of component (A) and/or component (B), wherein component (C) is selected from the group consisting of 1,3-butanediol, 1,2-pentanediol, and dipropylene glycol.
10. The production method according to claim 9 , wherein component (B) is a metal oxide fine powder.
11. The production method according to claim 9 , wherein component (B) is selected from the group consisting of a silica fine powder, an alumina fine powder, and a titanium oxide fine powder.
12. The production method according to claim 9 , wherein
component (A) is a silicone rubber powder having an average particle size of 0.1 to 200 μm;
component (B) is metal oxide fine powder; and
component (C) has a viscosity at 25° C. of not more than 200 mPa·s.
13. The production method according to claim 9 , wherein component (B) is present in an amount of 2 to 30 mass parts per 100 mass parts of component (A).
14. The production method according to claim 9 , wherein the viscosity of component (C) at 25° C. is not more than 200 mPa·s.
15. The production method according to claim 9 , wherein component (C) is 1,3-butanediol.