An inkjet ink composition having good stability which is an aqueous dispersion and/or solution of large particles of water soluble pigments derived from laked dyes, the water solubilizing groups on the surface of the laked dyes being exposed by removing surface counter-cations with chelating agents.

In laked tris- or tetracationic polymethine dyes I ##STR1## the variables have the following meanings: A is the radical of a fused-on substituted or unsubstituted benzene or naphthalene nucleus, Y is nitrogen or phosphorus, Z is --NR.sup.1 --, --O--, --S--, --C(CH.sub.3).sub.2 -- or --CH.dbd.CH--, where R.sup.1 is a radical as defined for R, D is --CX.sup.1 .dbd., --CH.dbd.CX.sup.1 --CH.dbd., ##STR2## Het.sup.e is the equivalent of a heteropolyacid anion, m is from 1 to 10, and n is 3 or 4, wher...

Organic pigment lakes are prepared by adsorption of a high molecular weight or polymeric dye onto suitable substratum or extender therefor. The properties of the resultant polymeric lakes approach those of true pigments, and said lakes exhibit maximized dye loading capacities and are exceptionally free of bleed. Thus, the applicability of lake colors is extended in the various food systems and their use is also permitted as industrial pigments.

A nanoscale pigment particle composition includes an organic monoazo laked pigment including at least one functional moiety, and a sterically bulky stabilizer compound including at least one functional group, wherein the functional moiety associates non-covalently with the functional group; and the presence of the associated stabilizer limits the extent of particle growth and aggregation, to afford nanoscale-sized pigment particles.

An orange laked monoazo pigment has the following formula (I): ##STR1## wherein M is an alkaline metal selected from the group consisting of calcium, barium, strontium, magnesium and manganese.

A process for the production of easily dispersable laked azo pigments, laking being carried out in the presence of A. a water-soluble salt of a polymerized abietic acid and B. a water-soluble salt of a dialkyl ester of sulfosuccinic acid of 5 to 15 carbon atoms in each alkyl group. The azo pigments obtained may be processed into printing inks by stirring them into printing ink binders.

Disclosed is a red pigment compound containing a pigment represented by Formula I: ##STR00001## having a certain Hue Angle and Apparent Strength. Also disclosed is a method of making a red pigment composition. Further disclosures relate to coating compositions, ink compositions, plastic compositions, electrostatic toner compositions, powder coating compositions, paint compositions, and paper compositions containing the red pigment represented by Formula I.

Disclosed are red shade yellow compositions characterized by the formula: ##STR1## wherein X is a lower alkyl or a --COOR.sub.1 group; wherein R.sub.1 is a hydrogen or lower alkyl group; each Y is independently a lower alkyl, lower alkyloxy or halogen group; a is 0, 1, or 2; and M is a divalent metal. Also disclosed is a process for preparing red shade yellow pigment compositions prepared by initially a diazonium component comprised of one or more aromatic amines wherein at least one of said ami...

Novel improved single-phase mixed crystals of monoazo dyes laked with alkaline earth metal cations and ammonium cations in a molar ratio of about 1:2 having a fine particle size and substantially better fastness properties than similar known products are excellently suitable as tinctorially strong pigments. Also claimed is a process for the preparation of a single-phase mixed crystal pigment of formula ##STR1## wherein E is Mg, Ca or Sr, by crystallisation from an inert hydrophilic liquid in the...

The invention relates to novel monoazo compounds of formula (1), wherein R represents H or Cl, M.sup.2+ represents Ca.sup.2+ or SR.sup.2+ and Y.sub.1 =H and Y.sub.2 =SO.sub.3.sup.- or Y.sub.1 =SO.sub.3.sup.- and Y.sub.2 =H. The compounds of formula (1) are characterized by their high drying power and high light-fastness. ##STR1##