Coated sodium percarbonate particles, detergent composition comprising such sodium percarbonate and method of selecting such sodium percarbonate

摘要

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 percent by weight of below 350 microns and has a moisture pick-up when measured in a test at 80 percent relative humidity and 32 degC after 24 hours of not greater than 30g/1000g sample. A suitable sodium percarbonate can be made most conveniently by crystallization from a bulk saturated solution of sodium percarbonate in a crystallizer/classifier that does not employ a conventional chloride salting-out agent.