Activated bleaching process and compositions therefor
AssigneeShell Oil Company
InventorsLouis N. Kravetz, Hans E. Kubitschek
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, sufficient buffering agent to maintain the aqueous medium under alkaline conditions, cyanamide or a metal cyanamide as a peroxide activator, and magnesium, which acts in conjunction with cyanamide or metal cyanamide to further activate the peroxide-based bleach. Stable concentrated liquid or solid peroxide-based bleach compositions containing cyanamide or a metal cyanamide activator and a magnesium compound are also disclosed.
Claims29
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 or a Group IA or Group IIA metal cyanamide, (c) a magnesium compound and (d) a buffering agent to maintain the aqueous medium under alkaline conditions.
A stable concentrated bleaching composition consisting essentially of (a) from 1 to 35% by weight, calculated as hydrogen peroxide, of the total composition of a peroxide-based bleach, (b) a peroxide-activating amount of cyanamide or Group IA or Group IIA metal cyanamide and (c) a magnesium compound, the molar ratio of the magnesium compound to the peroxide-based bleach being from 1:60 to 25:1.
A bleaching/washing composition consisting essentially of an aqueous medium containing (a) from 2 to about 600 millimoles/liter of a peroxide-based bleach, (b) a peroxide-activating amount of cyanamide or Group IA or Group IIA metal cyanamide, (c) a magnesium compound (d) an alkaline buffering agent to maintain the aqueous medium under alkaline conditions and (e) a bleachable substance, the molar ratio of the magnesium compound to the peroxide-based bleach being from 1:60 to 25:1.
In a process for manufacturing a built laundry detergent composition containing a synthetic detergent and an alkaline detergent builder, the improvement which comprises incorporating into said detergent composition (a) from 0.1 to 2% by weight, calculated as hydrogen peroxide, of a peroxide-based bleach, (b) a peroxide-activating amount of cyanamide or Group I or Group IIA metal cyanamide and (c) a magnesium compound, the molar ratio of the magnesium compound to the peroxide-based bleach being from 1:60 to 25:1.
A built laundry detergent composition consisting essentially of (a) a major amount of a synthetic detergent and an alkaline detergent builder, (b) a minor amount from 0.1 to 2% by weight, calculated as hydrogen peroxide, of a peroxide-based bleach, (c) a peroxide-activating amount of cyanamide or Group IA or Group IIA metal cyanamide and (d) a magnesium compound, the molar ratio of the magnesium compound to the peroxide-based bleach being from 1:60 to 25:1.
Dependencies are inferred from the claim text.