Plastic and nonmetallic article shaping or treating: processes – Formation of solid particulate material directly from molten... – By extrusion spraying or gravity fall through orifice
Patent
1973-12-26
1976-03-16
White, Robert F.
Plastic and nonmetallic article shaping or treating: processes
Formation of solid particulate material directly from molten...
By extrusion spraying or gravity fall through orifice
264101, B01J 202
Patent
active
039446395
ABSTRACT:
A process is disclosed whereby porous flakes usable for making paper-like sheets are produced by melting a 10 to 75 parts by weight of thermoplastic polymer, dispersing 25 to 90 parts by weight of finely divided inorganic particles in a solvent capable of dissolving the polymer in an amount of 80 to 95% based on a total weight of the polymer, the inorganic particles and the solvent, at room temperature or lower to prepare a slurry. At a temperature at which the polymer can be dissolved in the solvent, the polymer melt is mixed with the slurry which has been preliminarily heated to a temperature pertinent for realizing the above-mentioned dissolving temperature when the heated slurry is mixed with the polymer melt, to prepare a uniform dispersion of the inorganic particles in the polymer solution in the solvent and then, the dispersion is spurted from a closed tank through an orifice, into a zone having a temperature and pressure lower than that of the dispersion, whereby the spurted dispersion is converted to composite porous flakes by rapidly evaporating the solvent.
REFERENCES:
patent: 3561003 (1971-02-01), Lanham et al.
patent: 3799235 (1974-03-01), Moosavian et al.
Chemical Engineers' Handbook, 4th Ed., 1963, pp. 20-57 to 20-60, McGraw-Hill Co., New York.
Edamatsu Michisuke
Imao Syoji
Mihara Sirou
Osajima Yoshihiro
Shinomiya Tokuo
Hall J. R.
Mitsubishi Rayon Co. Ltd.
White Robert F.
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