Bichromal spheres

Details Bichromal spheres Bichromal spheres

1998-03-05

1999-11-23

Meeks, Timothy

Coating processes

Solid particles or fibers applied

427202, 427214, 427218, 427222, 4272481, 427 2531, 430106, C23C 1604

Patent

active

059896299

ABSTRACT:
A process for the preparation of bichromal spheres comprising (I) preparing monochromal spheres by the aggregation and coalescence of an emulsion resin with a first colorant and inorganic salt; (ii) contacting the resulting monchromal spheres with an oxidizing agent, followed by a polymerization with a vinyl monomer and a free radical initiator; (iii) forming a of the resulting monochromal spheres on a substrate; and (iv) subjecting the resulting monochromal spheres to a vapor thermal deposition with a second colorant dissimilar than the first colorant to thereby coat one hemisphere of each of said monochromal spheres thereby resulting in bichromal spheres with dissimilar colors.

REFERENCES:
patent: 4126854 (1978-11-01), Sheridon
patent: 4143103 (1979-03-01), Sheridon
patent: 4261653 (1981-04-01), Goodrich
patent: 4438160 (1984-03-01), Ishikawa et al.
patent: 4810431 (1989-03-01), Leidner
patent: 5213938 (1993-05-01), Sacripante et al.
patent: 5262809 (1993-11-01), Nishimura et al.
patent: 5389945 (1995-02-01), Sheridon
patent: 5534379 (1996-07-01), Dalal et al.
patent: 5593807 (1997-01-01), Sacripante et al.

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