Patent ID: 6485877
Filing Date: 2002-11-26
Classification: G03G,H01F,Y10T

Abstract:
Magnetic particles having an average particle size of 10 to 200 &mgr;m, comprising:magnetic core particles; and a coating layer formed on each surface of said magnetic core particles, consisting essentially of: (1) a silicone resin, (2) at least one metal alkoxide represented by the general formula (I): (RO)nMâ€ƒâ€ƒ(I) â€ƒwherein R is a C1 to C16 alkyl group; M is Al, Ti, Na, K, Ca, Zn or Fe; and n is an integer of 1 to 4, in an amount of 0.05 to 0.3% by weight based on the weight of said silicone resin (solid content), and (3) at least one silane coupling agent selected from the group consisting of an amino-containing silane coupling agent and an epoxy-containing silane coupling agent in an amount of 0.1 to 20.0% by weight based on the weight of said silicone resin (solid content).