Preparation and use of nanosize pigment compositions
AssigneeCiba Specialty Chemicals Corporation
InventorFridolin Bäbler
Life of this patent
Estimating the term…
Abstract
A mixture of an organic nanosize pigment comprising of from 50 to 99% by weight of the nanosize pigment and 1 to 50% by weight based of a low molecular weight naphthalene sulfonic acid formaldehyde polymer and its use as a particle growth and crystal phase director for the preparation of a direct pigmentary organic pigment or in pigment finishing.
Claims13
A composition comprising from 50 to 99% by weight of an organic pigment having an average particle size of from 1 to 100 nm and from 1 to 50% by weight of a naphthalene sulfonic acid formaldehyde polymer of molecular weight from 400 to 10000, wherein the polymer has formula
- wherein n is a number from 0 to 12, comprising additionally from 0.01 to 10% by weight, based on the pigment, of a pigment derivative of the formula
- wherein n is 1 or 2 and Q is a radical obtained by deprotonation of said pigment.
A process for the preparation of a composition comprising an organic pigment having an average particle size of from 1 to 100 nm, comprising dissolving said pigment in a mineral acid, adding or preparing in the presence of said pigment in the mineral acid a naphthalene sulfonic acid formaldehyde polymer, and precipitating the composition by drowning said pigment and said naphthalene sulfonic acid formaldehyde polymer together into an aqueous liquid.
A process for the preparation of an anthraquinone, phthalocyanine, perinone, perylene, diketopyrrolopyrrole, thioindigo, thiazinindigo, iminoisoindoline, iminoisoindolinone, quinacridone, flavanthrone, dioxazine, indanthrone, anthrapyrimidine or quinophthalone pigment or a solid solution thereof wherein said pigment is prepared in the presence of up to 25% by weight based on the weight of pigment prepared of a composition comprising from 50 to 99% by weight of an organic pigment having an average particle size of from 1 to 100 nm and from 1 to 50% by weight of a naphthalene sulfonic acid formaldehyde polymer of molecular weight from 400 to 10000.
Dependencies are inferred from the claim text.