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US 5,453,151 AGranted
Resinated 2,9-dimethylquinacridone
AssigneeCiba-Geigy Corporation
InventorFridolin Babler
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AssigneeCiba-Geigy Corporation
InventorFridolin Babler
Estimating the term…
This invention relates to a resinated 2,9-dimethylquinacridone pigment, which is prepared by a process comprising (a) preparing an aqueous suspension containing a 2,9-dimethylquinacridone pigment, a mixture of water-soluble acid salts and a particle growth inhibitor, wherein the mixture of water-soluble acid salts consists essentially of from about 50 to about 95 parts by weight of a water-soluble resin acid salt, and from about 5 to about 50 parts by weight of a water-soluble salt of a napthenic acid or a dimeric acid, or a mixture thereof, (b) precipitating the mixture of acid salts from the suspension in the form of insoluble salts and (c) isolating the resinated 2,9-dimethylquinacfidone pigment from the suspension. The resinated 2,9-dimethylquinacridone pigment possesses excellent dispersability, color strength, saturation and heat stability. It is especially useful for coloring plastics, coatings and inks.
A process for preparing a resinated 2,9-dimethylquinacridone pigment, which process comprises (a) preparing an aqueous suspension comprising a small particle size 2,9-dimethylquinacridone pigment and a mixture of water-soluble acid salts, wherein the mixture of water-soluble acid salts consists essentially of from about 50 to about 95 percent by weight of a water-soluble resin acid salt, and from about 5 to about 50 percent by weight of a water-soluble naphthenic acid salt or a water-soluble dimeric acid salt, or a mixture thereof, (b) precipitating the mixture of acid salts from the suspension as insoluble salts and (c) isolating the resinated 2,9-dimethylquinacridone pigment from the suspension;
A resinated 2,9-dimethylquinacridone pigment, which pigment comprises a homogeneous blend consisting of 74 to 94 parts by weight of a small particle size 2,9-dimethylquinacridone pigment, from 1 to 6 parts by weight of a pigment particle growth inhibitor and from 5 to 20 parts by weight of a mixture of water-insoluble acid salts, the sum of the parts by weight being 100, which mixture of water-insoluble acid salts consists essentially of from 50 to 95 percent by weight of a water-insoluble resin acid salt and from 5 to 50 percent by weight of a water-insoluble naphthenic or dimetic acid salt or a mixture thereof.
A method of coloring a high molecular weight organic material, which comprises incorporating an effective pigmenting amount of a resinated 2,9-dimethylquinacridone pigment into the high molecular weight organic material, wherein the resinated 2,9-dimethylquinacridone pigment comprises 100 parts by weight of a homogeneous blend consisting essentially of 74 to 94 parts by weight of a small particle size 2,9-dimethylquinacridone pigment, from 1 to 6 parts by weight of a pigment particle growth inhibitor and from 5 to 20 parts by weight of a mixture of water-insoluble acid salts which mixture consists of from 50 to 95 percent by weight of a water-insoluble resin acid salt and from 5 to 50 percent by weight of a water-insoluble naphthenic or dimeric acid salt or a mixture thereof.
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