| 摘要 |
PCT No. PCT/FI93/00356 Sec. 371 Date Apr. 26, 1995 Sec. 102(e) Date Apr. 26, 1995 PCT Filed Sep. 7, 1993 PCT Pub. No. WO94/05594 PCT Pub. Date Mar. 17, 1994The 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-(-CH2-CH2-O)r-(CHCH3-CH2-O)s-(-CH2-CH2-O)t-H and X<100% and Y>0%, R1 is -H or -CH3, R2 is -COOM, in which M may be H+ or a cation, in particular Na+, K+ or NH+4, R7 and R8 may be identical or different, being -COOM, -CONR5R6, H, -OH or -COO(-CH2-CH2-O)r-(CHCH3-CH2-O)s-(-CH2-CH2-O)t-H and R5 and R6 are -H or an alkyl group, in particular C1-C4 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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