Method for Improving the Dispersion and Adhesion of Magnetic Particles in a Binder
Original Publication Date: 1985-Oct-01
Included in the Prior Art Database: 2005-Feb-19
Clusters of magnetic particles are separated into individual particles by a capillary rheograph, and the particles are covered with a layer of an aminoalkoxysilane to prevent reaggregation and to permit chemical bonding of the particles to the binder. Particles 1 (Fig. 1), shaped like needles, tend to form clusters 2, with their sides along the longitudinal axis sticking to each other. In capillary rheograph 3 (Fig. 2), having a wide cylindrical section 4 with a piston 5, a conical section 6 and a narrow cylindrical section 7, clusters 2, contained in a dispersion also including an aminoalkoxysilane, are pushed by piston 5 towards sections 6 and 7. There, later al shearing, illustrated by arrows 8 of different lengths in Fig.