Activated bleaching process and compositions therefor
AssigneeShell Oil Company
InventorsHans E. Kubitschek, Louis Kravetz
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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, sufficient buffering agent to maintain the aqueous medium under alkaline conditions and certain metal cyanamides (e.g., calcium cyanamide, disodium cyanamide and sodium acid cyanamide), which have been found to be highly effective peroxide activators when employed under alkaline conditions. Stable concentrated liquid and solid metal cyanamide-activated bleaching compositions are also disclosed.
Claims25
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 a Group IA or IIA metal cyanamide and (c) a buffering agent to maintain the aqueous medium under alkaline conditions.
A stable concentrated bleaching composition consisting essentially of a peroxide-based bleach and a peroxide-activating amount of a Group IA or IIA metal 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 a peroxide-based bleach, calculated as hydrogen peroxide, a peroxide-activating amount of a Group IA or IIA metal 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 detergent composition from 0.1 to 2% by weight, calculated as hydrogen peroxide, of a peroxide-based bleach and a peroxide-activating amount of a Group IA or IIA metal 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 a Group IA or IIA metal cyanamide.
Dependencies are inferred from the claim text.