B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/505
B29C 35/00 (2006.01) B29C 71/00 (2006.01) C03B 9/00 (2006.01) C04B 38/02 (2006.01)
Patent
CA 1292106
ABSTRACT Hollow porous and non-porous microspheres are made from dispersed particle film forming compositions comprising dispersed particles, a binder, a film stabilizing agent, a dispersing agent and a continuous liquid phase. The hollow porous microspheres have walls with voids which are interconnected to each other and to the inner and outer wall surfaces. The microspheres can be made from dispersed particles of ceramic, glass, metal, metal glass, plastic, and mixtures thereof. The microspheres can be used as filler materials and as supports and enclosures for catalysts. The hollow microspheres are made by feeding the dispersed particle composition and a blowing gas to a coaxial blowing nozzle having an inner coaxial nozzle for the blowing gas and an outer coaxial nozzle for the dispersed particle composition. The blowing gas is fed to the inner nozzle and the dispersed particle composition is fed to the outer nozzle to blow and form, in the region of the coaxial blowing nozzle orifice, hollow dispersed particle composition microspheres. The hollow microspheres are removed from the region of the orifice and treated to bring the dispersed particles into point to point contact and to harden them to obtain hollow green microspheres, which are subjected to a sufficiently high temperature to remove the continuous liquid phase from the hollow green microspheres and to sinter the dispersed particles to obtain hollow porous microspheres. The hollow porous microspheres can be treated with semipermeable membrane forming materials to make them non-porous and suitable for use in selective separation processes and in biotech processes.
600994
Borden Ladner Gervais Llp
Torobin Leonard B.
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