Abstract: Magnetic-polymer latex having a concentration of less than 65% by weight of hydrophobic vinyl aromatic polymer particles. The polymer particles have diameters from 0.03 to 5 microns and also have dispersed therein a magnetically-charged material in an amount of from 0.5 to 50% by weight with respect to the polymer portion of the polymer particles.A process for preparing magnetic-polymer latices. Magnetically charged particles are dispersed in an organic phase comprising an organically soluble initiator and an organic monomeric component selected from the group consisting of a single vinyl aromatic monomer and a combination of a single vinyl aromatic monomer and a copolymerizing monomer. The dispersion so obtained is mixed with an aqueous solution containing an emulsifying agent and the mixture is homogenized. Polymerization is then effected to form a magnetic-polymer latex containing hydrophobic vinyl aromatic polymer particle.

Abstract: Process for the preparation of magnetic beads of vinylaromatic polymers, which comprises dispersing a magnetic filler in a solution of a homo- or co-polymer in a vinylaromatic compound alone or in mixture with a co-polymerizable monomer, putting the resulting dispersion into suspension in water and polymerizing the monomer or monomers, and use of said magnetic beads in the paints, inks, reprography and in biology.

Abstract: The present invention relates to a process and a device for the production of bi-component yarns containing bilaminar and multilaminar filaments.Two polymer compositions are spun after feeding through a dichotomic mixer possessing tubes of identical internal diameter (5 to 25 mm), inside which 4 to 9 helical elements are placed in series, the leading edge of each of the elements being placed at 90.degree. relative to the trailing edge of the previous element. The process and device according to the invention can be used for all types of spinning, namely solution spinning, melt spinning, semi-melt spinning and the like. The yarns obtained contain only a minor proportion of monolaminar filaments.

Abstract: The present invention relates to a process and a device for the production of bi-component yarns containing bilaminar and multilaminar filaments.Two polymer compositions are spun after feeding through a dichotomic mixer possessing tubes of identical internal diameter (5 to 25 mm), inside which 4 to 9 helical elements are placed in series, the leading edge of each of the elements being placed at 90.degree. relative to the trailing edge of the previous element. The process and device according to the invention can be used for all types of spinning, namely solution spinning, melt spinning, semi-melt spinning and the like. The yarns obtained contain only a minor proportion of monolaminar filaments.