Method of preparing polymer-coated particulate inorganic materia

Details Method of preparing polymer-coated particulate inorganic materia Method of preparing polymer-coated particulate inorganic materia

1983-02-18

1985-04-02

Lusignan, Michael R.

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

264109, 524701, 524780, 524789, 524791, 524847, B05D 700, B29J 500

Patent

active

045087610

ABSTRACT:
A polymer-coated particulate inorganic material, e.g. graphite, graphite fluoride or molybdenum disulfide, is obtained by preparing a reaction system containing a liquid medium, fine particles of the inorganic material, at least one vinylic monomer which undergoes radical polymerization or copolymerization and a polymerization initiator and allowing the vinylic monomer(s) in the reaction system to undergo polymerization and to bond to the surfaces of the inorganic material particles by graft polymerization. To enhance the efficiency of graft polymerization to thereby realize uniform coating even when the inorganic material is very low in surface energy as typified by graphite fluoride, the pH of the reaction system is adjusted to a value ranging from 5 to 9 by adding alkali to the reaction system soon after the addition of the polymerization initiator or alternatively by treating the inorganic material with alkali in advance of preparation of the reaction system. The polymer-coated inorganic material can easily be shaped into a solid body by compacting, optionally with addition of a synthetic resin.

REFERENCES:
patent: 3560254 (1971-02-01), Seddon
patent: 3904568 (1975-09-01), Yamaguchi et al.
patent: 3953657 (1976-04-01), Yamaguchi et al.
patent: 4129549 (1978-12-01), Kahane

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