Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1994-02-25
1995-12-05
Bell, Mark L.
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106402, 106422, 106496, 404 72, 427136, C09C 104
Patent
active
054724929
ABSTRACT:
The invention relates to extended, organic pigments, their method of manufacture and their use in paint formulations, particularly those suitable for road or traffic markings. The subject pigments typically comprise a particulate lithopone core coated with a layer of an organic pigment. According to preferred embodiments, the pigment comprises an azo compound, the pigments are rosinated, and/or the core also contains a colorant or doping material, typically a metal oxide or metal salt. An exemplary method involves mixing particulate lithopone with a coupler such as acetoacet-o-anisidide. A coupler precipitator, typically an acidifier, is then added in an amount sufficient to precipitate the coupler onto the lithopone. The lithopone-bound coupler is then reacted with a diazonium ion in an azo-coupling reaction to form a pigment. The pigment-coated lithopone particles may then be heated and coated with a rosin or modified rosin soap.
REFERENCES:
patent: 5127952 (1992-07-01), Persello et al.
Bannister Derek W.
Issel Michael T.
Long Shao H.
Wang Quilin
Xiao Guiping
Bell Mark L.
Guangzhou Hauli Pigment Chemical Industrial Co.
Hertzog Scott L.
Sino-American Pigment Systems, Inc., Inc.
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