Patent ID: 7704438
Filing Date: 2010-04-27
Classification: C08K,C08L

Abstract:
1. A method for producing a permanently-magnetic molding, made from a polymeric support material filled with magnetic filler materials on a basis of silicon caoutchouc, hot-vulcanized from at least one starting material, the method comprising mixing the at least one starting material of the silicon caoutchouc prior to vulcanization with 50 to 95% by weight of high energy ferrite particles of a density of 5.0 to 5.2 g/cm 3 and an average particle size of 1.5 to 2.5 μm as a magnetic filler material to obtain a homogenized mixture, subsequently introducing the homogenized mixture into a mold cavity by a temperature-regulated screw and cross-linking by vulcanization in the mold cavity by an application of heat for forming the molding, and during cross-linking applying a static magnetic field to the mold cavity to magnetize and align the magnetic filler materials in the silicon caoutchouc being cross-linked.