Aqueous dispersions of coloring materials: poly-alkyleneoxy naphthalene dispersing agents
AssigneeImperial Chemical Industries PLC
InventorGeoffrey R. Rothwell
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Abstract
An aqueous dispersion of a solid, especially a disperse dyestuff or a pigment, containing, as dispersing agent, a water-soluble, non-ionic polycyclic aromatic compound having a poly(lower alkylene-oxy)chain containing from 5 to 30 lower alkylene-oxy groups. Preferred dispersing agents contain about 10 ethylene-oxy groups in the chain. The dispersions of disperse dyestuffs are especially suitable for use in aqueous print pastes based on synthetic thickening agents and the pigment dispersions are suitable for use in emulsion paints.
Claims7
An aqueous dispersion of a finely-divided, inorganic or non-ionic, organic solid selected from the groups consisting of disperse dyestuffs, pigments, optical brightening agents and anthraquinone, containing a water-soluble, non-ionic dispersing agent which comprises naphthalene carrying, in the alpha or the beta position, a water-solubilising poly(C.sub.2 to C.sub.4 alkyleneoxy) chain containing from 5 to 15 C.sub.2 to C.sub.4 alkyleneoxy groups and otherwise free from substituents.
Dependencies are inferred from the claim text.