| 摘要 |
PURPOSE:To enhance fixability, durability, etc. by coating the surface of the core material to be encapsulated with the first shell of a water-soluble polymer having COOH or OH groups and pptd. by addition of a compd. of a di- or poly- valent metal, and the second shell phase separated from an org. solvent. CONSTITUTION:Core material particles contg. a pressure-fixable component, a magnetic powder, etc. are dispersed into an aq. soln. of a water-soluble polymer having COOH or OH groups, such as sodium alginate or PVA, and a water- soluble salt of a di- or poly-valent metal, such as CaCl2 or MgCl2 to precipitate the polymer on the surface of each particle as the first shell. These particles are dried and then, dispersed into an org. soln. of an oleophilic polymer, and water is dropped to precipitate the polymer on the surface of each particle as the second shell. The encapsulated toner thus obtained is prevented from peeling off the outer shells and offset phenomenon, and superior in durability, etc. |
