| abstract |
ABSTRACT OF THE DISCLOSURE Pulverulent, porous polymer particles are produced by placing a homogeneous mixture of at least two components, namely a fusible polymer and an inert liquid, at a temperature above the segregation temperature, in a solid particle bed, followed by cooling to a temperature below the solidification temperature of the polymer in the mixture, the resulting cake like mass being comminuted, and the polymer substance being separated from the inert liquid and the solid particles; sodium sulphate having a grain size of between 50 and 400 µm is preferably used as the solid particle bed; polypropylene is particularly suitable as the polymer and N,N-bis-(2-hydroxyethyl)-hexadecylamine as the inert liquid; the pulverulent particles may be used to separate hydrophobic substances, especially oil from water, for absorbing liquids, as additives for coating agents, as carriers for long term release substances, more parti-cularly in agriculture, forestry and gardening, and as additives for concrete. |