Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Reexamination Certificate
2005-06-28
2005-06-28
Green, Anthony J. (Department: 1755)
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
C106S412000, C106S419000, C106S440000, C106S441000, C106S447000, C106S453000, C106S456000, C106S459000, C106S460000, C106S479000, C106S480000, C106S493000, C106S494000, C106S495000, C106S496000, C106S497000, C106S498000, C106S503000
Reexamination Certificate
active
06911075
ABSTRACT:
The invention relates to a process for preparing pigments, which comprisessubjecting a crude pigment or mixture of crude pigments and a crystalline inorganic salt or mixture of crystalline inorganic salts together, essentially in the absence of other constituents, to the action of a rotor having a tangential speed of at least 10 m/s, so that a temperature of at least 80° C. is attained by means of friction effects; and subsequentlykneading the product of this treatment with an organic liquid, during which it is possible if desired to add additional substances selected from the group consisting of inorganic salts, inert additives and colorant.These pigments and their use in polymers, printing inks and colours filters are also claimed.The invention in particular relates to a novel pigment form of Pigment Violet 23obtained by above-mentioned process and having higher colour strength and colour saturation as well as excellent other applications properties in particular in printing inks.The invention also relates to a highly crystalline novel form of Pigment Red 254obtained by above-mentioned process, too, and having a steep slope on the bathochromic side of the absorption spectrum's maximum, and the use thereof in particular in colour filters.
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Deno Takashi
Grandidier Yves
Riegler Albert
Ruf Klaus
Schlatter Urs
CIBA Specialty Chemicals Corp.
Green Anthony J.
Stevenson Tyler A.
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