| abstract |
(57) Abstract: [PROBLEMS] To provide a highly hydrophilic and temperature-sensitive composite powder which can be easily produced and has high stability, and a method for producing the same. SOLUTION: This is a composite powder in which a film made of a silicone polymer having a Si-H portion is formed on the surface of the powder, and a hydrophilic polymer film such as polyacrylamide is formed on the outer layer of the film. Further, the production method is as follows. A coating film made of a silicone polymer having a Si-H portion is formed on the surface of the powder, and then a hydroxyl group-containing unsaturated compound and the Si-H portion of the silicone polymer are subjected to an addition reaction to obtain a powder. A reaction point with a hydrophilic polymer is formed on the surface, and a hydrophilic polymer film in which the hydrophilic polymer is bound via this hydroxyl group is formed on the outermost layer. |