Lyophilization process for preparing composite particles for use in electroconductive transfer films and products produced therewith
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United States of America Patent
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Jun 12, 1984
Grant Date -
N/A
app pub date -
Jul 6, 1982
filing date -
Jul 6, 1982
priority date (Note) -
Expired
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Abstract
A method for the preparation of conductive graphite particles useful as an electrically anisotropic support layer for an electroconductive transfer film comprising initially grinding a slurry of graphite particles in the presence of water or a solvent having freezing and vapor pressure properties similar to water, for a period of time sufficient to substantially completely disperse the graphite particles in the water or solvent. A binding or film forming polymer is then added to the graphite slurry, said polymer being soluble in the water or solvent. The resulting slurry is then subjected to a freeze drying step so that the water or solvent present is caused to sublime resulting in the formation of polymeric coated graphite particles of at least 0.2 microns in diameter. These particles can be incorporated into the support layer of a electroconductive transfer film.
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