发明授权
- 专利标题： Preparing a crystalline, stable sodium percarbonate
- 专利标题（中）： 制备结晶稳定的过碳酸钠
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申请号： US397171申请日： 1995-04-25
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公开(公告)号： US5603911A公开(公告)日： 1997-02-18
- 发明人: Timo Korvela , Jonni Ahlgren , Bo Hedenas , Ilkka Renwall
- 申请人： Timo Korvela , Jonni Ahlgren , Bo Hedenas , Ilkka Renwall
- 申请人地址： FIX Espoo
- 专利权人： Kemira OY
- 当前专利权人： Kemira OY
- 当前专利权人地址： FIX Espoo
- 优先权： FIX923995 19920907
- 主分类号： C01B15/10
- IPC分类号： C01B15/10 ; C11D3/39 ; C01B31/24
摘要：
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 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%.
公开/授权文献
- US6089647A School bus door operator 公开/授权日：2000-07-18
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