Activated bleaching process and compositions therefor
AssigneeShell Oil Company
InventorsLouis Kravetz, Eugene F. Lutz
Life of this patent
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Abstract
A process for the activation of peroxide-based bleaches comprises conjointly incorporating into an aqueous medium a peroxide-based bleach, a buffering agent to maintain the aqueous medium at a pH above 7.5, and cyanamide, which has been found to be a highly effective peroxide activator when employed under alkaline conditions. Stable concentrated liquid and solid cyanamide-activated bleaching compositions are also disclosed.
Claims27
A process for activating a peroxide-based bleach which comprises conjointly incorporating into an aqueous medium effective amounts of (a) a peroxide-based bleach, (b) a peroxide-activating amount of cyanamide and (c) a buffering agent to maintain the pH of the aqueous medium above 7.5.
A stable concentrated liquid bleaching composition consisting essentially of an aqueous solution of from 2.5 to about 35% by weight, calculated as hydrogen peroxide, of a peroxide-based bleach, a peroxide-activating amount of cyanamide and a buffering agent to maintain the pH of the aqueous solution from about 2 to 5.
A stable concentrated solid bleaching composition consisting essentially of a solid mixture of peroxide-based bleach and a peroxide-activating amount of cyanamide as an activator therefore.
A bleaching/washing composition consisting essentially of an aqueous medium containing from about 2 to about 600 millimoles/liter of hydrogen peroxide, a peroxide-activating amount of cyanamide, a buffering agent to maintain the pH of the aqueous medium within the range of 7.5 to about 13, and a bleachable substance.
In a process for manufacturing a built laundry detergent composition comprising a synthetic, detergent and an alkaline detergent builder, the improvement which comprises incorporating into said composition from 0.1 to 2% by weight, calculated as hydrogen peroxide, of a peroxide-based bleach and a peroxide-activating amount of cyanamide.
A laundry detergent composition consisting essentially of (1) a major amount of a synthetic detergent and an alkaline detergent builder, (2) a minor amount, from 0.1 to 2% by weight, calculated as hydrogen peroxide, of a peroxide-based bleach and (3) a peroxide activating amount of cyanamide.
Dependencies are inferred from the claim text.