Detergent additives comprising dye transfer inhibitors, and process for making them
AssigneeThe Procter & Gamble Company
InventorsScott John Donoghue, Koen Mariette Albert Schamp
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Abstract
Free-flowing powder detergent additives particularly useful as agglomerates to be added during the manufacture of detergents suitable for washing colored fabric and which contain certain detergent builders, dye transfer inhibiting polymers and optionally a detersive surfactant. Also disclosed are methods for preparing a premix of specific hygroscopic dye transfer inhibitors for use in a spray-drying powder formation process. The compositions utilized for such premixes include a powder builder such as zeolite and the dye transfer inhibition polymers polyamine N-oxide, and copolymers of N-vinylpyrrolidone and N-vinylimidazole.
Claims7
A free-flowing powder detergent additive having a bulk density of at least 600 g/l consisting essentially of:
- (a) from 20% to 95% by weight, on anhydrous basis, of a detergent ingredient selected from the group consisting of aluminosilicate, citrate, silica, carbonate, bicarbonate, silicate, sulphate, phosphate, water-soluble polymer and mixtures thereof;
- and
- (b) from 5% to 50% by weight of a polymeric dye transfer inhibitor selected from the group consisting of polyamine N-oxide polymers, copolymers of N-vinylpyrrolidone and N-vinylimidazole and mixtures thereof.
A process for making free-flowing particles comprising hygroscopic powders of polymers comprising the steps of:
- (a) mixing a powdered polymer selected from the group consisting of polyamine N-oxide polymers, copolymers of N-vinylpyrrolidone and N-vinylimidazole, and mixtures thereof, with additional powders to form a powder premix, where the additional powders are selected from the group consisting of aluminosilicate, citrate, silica, carbonate, bicarbonate, silicate, sulphate, phosphate, water-soluble polymer and mixtures thereof;
- and
- (b) mixing the powder premix with an aqueous solution of polyamine N-oxide in a high shear mixer to form free-flowing particles.
Dependencies are inferred from the claim text.