COMPOSITIONS CONTAINING SODIUM PERCARBONATE

摘要

Sodium percarbonate exhibits a tendency to decompose in built compositions a nd 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 30g/1000g 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.