Abstract: A process for preparing coated particulate alkali metal percarbonate in which coating is carried out by mixing percarbonate with a solid particulate coating and agent and optionally with an aqueous liquid, so that the amount of water present during mixing does not exceed 12% of the total weight of the mixture. Coated alkali metal percarbonate obtainable by this process and its use as active bleach in detergent compositions is also disclosed.

Abstract: Coated sodium percarbonate particles are provided which contain a sodium percarbonate core, and a coating layer substantially free from sulate, borate and magnesium compounds, having at least 30 and at most 75% w/w of an alkali metal carbonate and at least 25 and at most 70% w/w of an alkali metal silicate. The alkali metal carbonate and silicate being uniformly dispersed in the coating layer. Also provided is a process for the preparation of the coated sodium percarbonate particles and their use in detergent compositions.

Abstract: Sodium percarbonate is traditionally made in a crystallization process from aqueous hydrogen peroxide and sodium carbonate with recycle of mother liquor in the presence of a substantial concentration of a salting out agent, conventionally sodium chloride. The invention provides a process intended to be conducted without addition of chloride salting-out agent in which the dissolution step is controlled to restrict the sodium carbonate concentration to below 95%, preferably 60 to 90% of its saturated concentration at a temperature preferably controlled to at most 35C. and the mole ratio of hydrogen peroxide:sodium carbonate in the reaction vessel is controlled to between 0.7 to 1.2:1, and preferably about 1:1.

Abstract: A process for stabilising particulate alkali metal percarbonate involves coating it with an aqueous solution, preferably concentrated, of a non-reducing oligomeric saccharide, preferably sucrose and especially together with an inorganic salt co-coating agent. The preferred co-coating agents are alkali metal silicate, sulphate, carbonate and carbonate chloride. Coated percarbonate is provided having an excellent combination of solubility, and stability, even with low amounts of coating agent.

Abstract: Sodium percarbonate exhibits a tendency to decompose in built compositions and particularly detergent compositions built with zeolites. The tendency can be ameliorated by selecting sodium percarbonate which intrinsically has a mean particle size of from 500 to 1000 microns and not more than 20% by weight of below 350 microns and has a moisture pick-up when measured in a test at 80% relative humidity and 32° C. after 24 hours of not greater than 30 g/1000 g sample. A suitable sodium percarbonate can be made most conveniently by crystallisation from a bulk saturated solution of sodium percarbonate in a crystalliser/classifier that does not employ a conventional chloride salting-out agent.

Abstract: Sodium percarbonate is traditionally made in a crystallization process from aqueous hydrogen peroxide and sodium carbonate with recycle of mother liquor in the presence of a substantial concentration of a salting out agent, conventionally sodium chloride.

Abstract: Sodium percarbonate is traditionally made in a crystallization process from aqueous hydrogen peroxide and sodium carbonate with recycle of mother liquor in the presence of a substantial concentration of a salting-out agent, conventionally sodium chloride. The invention provides a process intended to be conducted without addition of chloride salting-out agent in which the dissolution step (1) is controlled to restrict the sodium carbonate concentration to below 95%; preferably 60 to 90% of its saturated concentration at a temperature preferably controlled to at most 35° C. and the mole ratio of hydrogen peroxide: sodium carbonate in the reaction vessel is controlled to between 0.7 to 1.2:1, and preferably about 1:1.

Abstract: A process for stabilizing percarbonate by coating by means of a coating agent according to which the percarbonate particles are treated with a concentrated aqueous solution containing at least one boron compound selected from meta and ortho boric acids and at least one silicate, following by removal of water to provide coated percarbonate particles. The solution is prepared by adding the boron compound to a solution of the silicate. The coated particles are useful in washing and bleaching compositions.

Abstract: This invention concerns novel sulphoperoxyacids having the following generic formula ##STR1## wherein the R', R", and M are as defined in the specification. Bleach compositions and methods of bleaching using such novel sulphoperoxyacids are also taught.

Abstract: A composition having improved physical stability comprising an aqueous peroxidic solution of an alkali metal oxyboron compound containing alkali metal to boron in a substoichiometric mole ratio into which there has been introduced an effective stabilizing amount of cyclohexane -1,2-diaminotetra (methylene phosphonic acid) or a water soluble salt thereof. Also a process for enhancing the physical stability of an aqueous peroxidic solution of an alkali metal oxyboron compound containing alkali metal to boron in a substoichiometric mole ratio which is characterized by introducing into the solution an effective stabilizing amount of cyclohexane -1,2-diaminotetra (methylene phosphonic acid) or a water soluble salt thereof.