Photoactivator dye composition for detergent use
AssigneesDanochemo A/S, The Proctor & Gamble Company
InventorsBitten Thorengaard, David W. York
Life of this patent
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Abstract
A photoactivator dye composition includes microcapsules of a solid dispersion of a water-soluble photoactivator dye in an encapsulating material that is quickly soluble in water. In a method of preparing such a photoactivator dye composition, the photoactivator dye is dissolved in an aqueous medium, the solution thus obtained is mixed with an aqueous solution of the encapsulating material, the mixture thus obtained is converted into droplets, and the moisture content of these droplets is reduced to form a solid solution. The photoactivator dye composition may advantageously be used in a detergent composition which additionally includes a surfactant and conventional detergent ingredients.
Claims19
A photoactivator dye composition comprising microcapsules of a solid dispersion of a water-soluble photoactivator dye in an encapsulating material that is quickly soluble in water, said microcapsules comprising, by weight of the capsules,
- (a) from 1% to 60% of the photoactivator dye,
- (b) from 38% to 97% of an encapsulating material selected from the group consisting of gelatine, hydrolyzed gelatine and film-forming carbohydrates, and
- (c) from 2% to 12% water.
A detergent composition which comprises 2 ppm to 1,000 ppm, based on the total weight of the detergent composition, of a photoactivator dye composition that comprises microcapsules of a solid dispersion of a water-soluble photoactivator dye in an encapsulating material that is quickly soluble in water, said microcapsules comprising, by weight of the capsules,
- (a) from 1% to 60% of the photoactivator dye,
- (b) from 38% to 97% of an encapsulating material selected from the group consisting of gelatine, hydrolyzed gelatine and film-forming carbohydrates, and
- (c) from 2% to 12% water.
A method of preparing a photoactivator composition which comprises microcapsules of a solid dispersion of a water-soluble photoactivator dye in an encapsulating material that is quickly soluble in water, said microcapsules comprising, by weight thereof, of 1 to 60% of photoactivator dye, 38-97% encapsulating material selected from the group consisting of gelatine, hydrolyzed gelatine and film-forming carbohydrates, and 2 to 12% water, comprising the steps of
- (1) dissolving the photoactivator dye in an aqueous medium,
- (2) mixing the photoactivator dye solution with an aqueous solution of the encapsulating material,
- (3) converting the mixture thus obtained into droplets of an average particle size not exceeding 500 micrometers, and
- (4) reducing the moisture content of said particles to a value of between 2% and 12% by weight to form a solid solution of the photoactivator dye in the encapsulating material.
Dependencies are inferred from the claim text.