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Abstract

The object of the invention is a process for preparing a crystalline, stable sodium percarbonate, in which polymers of gross formulas (I or II) are added in the preparation process to control the crystal form of the sodium percarbonate and to coat the crystals, the molecular weight of the polymers varying in the range from 500 to 1,000,000 g/mol, or salts of these polymers or mixtures of polymers of formulas (I and It) or of their salts are added. Formula (I) denotes (I) and formula (II) denotes (II): HO--(--CH.sub.2 --CH.sub.2 --O).sub.r --(CHCH.sub.3 --CH.sub.2 --O).sub.s --(--CH.sub.2 --CH.sub.2 --O).sub.t --H and X<100% and Y>0%, R.sub.1 is --H or --CH.sub.3, R.sub.2 is --COOM, in which M may be H.sup.+ or a cation, in particular Na.sup.+, K.sup.+ or NH.sup.+.sub.4, R.sub.7 and R.sub.8 may be identical or different, being --COOM, --CONR.sub.5 R.sub.6, H, --OH or --COO(--CH.sub.2 --CH.sub.2 --O).sub.r --(CHCH.sub.3 --CH.sub.2 --O).sub.s --(--CH.sub.2 --CH.sub.2 --O).sub.t --H and R.sub.5 and R.sub.6 are --H or an alkyl group, in particular C.sub.1 --C.sub.4 and may be mutually identical or different groups and r, t and s may vary respectively in the range from 0 to 100%, their sum being 100%.

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First Claim