abstract |
the present invention relates to the process of preparing dispersion of particles magnetizable in polyol by mechanically mixing the particles magnetizable under temperature in the range of 80 to 260 ºc, preferably 100 to 220 ºc, more preferably 160 to 200 ºc, with polyol selected from the group consisting of polyesterols or polyether ester polyols with an acid number in the range of 0.1 to 3.0. |