Abstract: The invention relates to a process for preparing low- or non-dusting substantially completely non-volatile metal pigment compositions by forming a coherent paste comprising an organic binder medium, an organic liquid vehicle and metal pigment, in powder or flake form, the paste being formed by mixing a first component comprising the organic binder medium and a second component comprising metal pigment with either or both of the first and second components comprising organic liquid vehicle and the paste containing from 1 to 70 percent, preferably from 3 to 45 percent, of the organic binder medium based on the weight of the metal pigment, and removing substantially all of the organic liquid vehicle(s) from the coherent paste, optionally after sub-dividing the coherent paste into particles, such as pellets, tablets or granules. The resulting solid metal pigment composition comprises metal pigment particles dispersed in a matrix of the organic binder material.

Abstract: A process for the production of an azo compound comprising contacting with agitation a solution or dispersion of a diazotizable amine, a solution or dispersion of a coupling component and an organic or inorganic nitrite compound, in a water insoluble liquid organic acid, adding to the reaction mixture so formed aqueous alkali to transfer the organic acid, as its soluble salt, into the aqueous phase and separating the azo compound from the liquors.The azo compounds are produced in high yield and purity and are suitable for use as pigments and disperse dyes.

Abstract: A process for conditioning pigments which comprises grinding a crude copper phthalocyanine pigment and a crystallizing solvent in the absence of inorganic salt but in the presence of one or more sulphonated phthalocyanine amine derivative having the general formula ##STR1## wherein Pc is a phthalocyanine, R.sup.1, R.sup.3 and R.sup.4 are hydrogen or a hydrocarbon residue, R.sup.2 is a hydrocarbon residue, p is 0 to 3, q is 1 to 4, and the sum of p and q is 1 to 4, the resulting pigment composition is freely dischargeable from the mill in high yield and is, moreover largely in the .beta.-form.

Abstract: A process for producing a pigment or dyestuff composition in the form of dustless readily dispersible granules, which process comprises contacting, with agitation, an aqueous dispersion of a pigment and a composition comprising one or more organic acids which are liquid at temperatures below 100.degree. C. or their salts, at a pH value at which the acid is insoluble in water, the temperature being maintained during contacting above the melting point of the acid until the pigment has completely transferred into the organic phase; increasing the pH to a value suitable to render the acid soluble in water and recovering the resulting granules.

Abstract: A pigment composition comprising 80-99% weight/weight of copper phthalocyanine containing 1.5-10% weight/weight of peripherally-bound chlorine, and 20-1% weight/weight of a sulphonated copper phthalocyanine derivative having the formula: ##STR1## wherein CuPc represents a copper phthalocyanine residue, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are the same or different and each represents a hydrogen atom, an alkyl group having from 1 to 22 carbon atoms or a cyclic alkyl group having from 5 to 22 carbon atoms, an aryl,aralkyl,alkaryl or dehydroabietyl group, X represents hydrogen or an alkali metal atom and m, n and p can each be 0 or a value in the range of from 1 to 4, with the proviso that the sum of m, n and p is within the range of from 1 to 4; the composition being characterized by its x-ray diffraction spectrum as resembling the .gamma.

Abstract: A process for the manufacture of substantially dust free meterable and readily dispersible beads of a pigment composition which comprises contacting with agitation a suspension of a finely divided pigment or pigment composition in a mixture of water and an oxygenated aliphatic hydrocarbon solvent containing from 1 to 5 carbon atoms and having appreciable solubility in water, together with a solution of a carrier which is substantially water insoluble and soluble in the respective solvent at reflux temperature and then distilling off the solvent and recovering the resultant beads by filtration from the aqueous phase.

Abstract: A process for the preparation of a solvent-stable, red shade copper phthalocyanine pigment composition by reacting an organic compound capable of forming the phthalocyanine ring system, benzophenone 3,3',4,4'-tetracarboxylic acid or a derivative thereof, a copper compound capable of providing the copper atom of the copper phthalocyanine molecule, a reaction catalyst, and a nitrogen source, optionally in the presence of at least one phthalocyanine compound substituted by 1 to 4 groups of a sulphonate or sulphonic acid and/or sulphonamide which may be N-substituted.

Abstract: A single stage process for the production of copper phthalocyanine pigment compositions having x-ray diffraction spectra corresponding to the form of pure, or substantially pure .epsilon.-crystal modification of copper phthalocyanine comprising reacting, at an elevated temperature and in an organic solvent, an organic compound capable of forming the phthalocyanine ring system, a copper compound capable of providing the copper atom of the phthalocyanine molecule, a reaction catalyst, and a nitrogen source, in the presence of, as crystal form modifier, a compound of the formula: ##STR1## where Pc represents a copper phthalocyanine residue, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.

Abstract: A phthalocyanine pigment composition comprising a phthalocyanine pigment and a sulphonated phthalocyanine derivative of the formula(RNHSO.sub.2).sub.m --Pc--(SO.sub.3.sup..crclbar. N.sup..sym. H.sub.3 R).sub.nwherein the sum of m and n is 1 to 4 and R is a tertiary alkyl having 18 to 22 carbon atoms, which composition gives very good flow and strength when incorporated into paint and ink application media.