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US 4,810,524 AGranted
Inorganic powders with improved dispersibility
AssigneeTDK Corporation
InventorsMasatoshi Nakayama, Haruyuki Morita, Yuichi Kubota
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Abstract
Inorganic powders are coated with a thin film of an organic polymer formed on the individual particles by plasma polymerization. The film thickness may be not more than 100 .ANG., and the inorganic powders include magnetic ones.
Claims8
A method for improving the dispersibility of individual particles of an inorganic powder in an organic solution of a polymer binder, comprises the steps of:
- fluidizing the inorganic powder in a polymerization reaction vessel, said vessel being cylindrical and rotated about a principal cylindrical axis of said vessel so as to fluidize the inorganic powder, said axis being horizontally disposed;
- introducing a plasma-polymerizable monomer gas into the vessel;
- applying a plasma-forming energy to the monomer gas to form a plasma around each said individual particle of the fluidized inorganic powder;
- and
- coating, thereby, a thin plasma-polymerized film of said gas about each said fluidized individual particle.
2 more elements
A method for improving the dispersibility of individual particles of an inorganic powder in an organic solution of a polymer binder, comprises the steps of:
- fluidizing the inorganic powder in a polymerization reaction vessel;
- introducing a plasma-polymerizable monomer gas into the vessel;
- applying a plasma-forming energy to the monomer gas to form a plasma around each said individual particle of the fluidized inorganic powder;
- coating, thereby, a thin plasma-polymerized film of said gas about each said fluidized individual particle;
- and
- subsequently dispersing the coated particles in the organic solution of the polymer binder.
3 more elements
Dependencies are inferred from the claim text.