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    • 9. 发明授权
    • Process for preparing water-soluble phosphonomethyl ethers of cellulose
    • 制备纤维素水溶性膦酰基甲基醚的方法
    • US4379918A
    • 1983-04-12
    • US313350
    • 1981-10-20
    • Lothar BrandtArno Holst
    • Lothar BrandtArno Holst
    • C08B11/02C08B11/10C08B11/00C08L1/26
    • C08B11/10
    • Disclosed is a process for preparing water-soluble phosphonomethyl ethers of cellulose from cellulose and halogenomethane phosphonic acid or one of its salts or acid derivatives, in an aqueous, alkaline medium. The process is carried out in such a way that, for each mole of the cellulose, from about 2.1 to 15 moles of hydroxide ions and from about 0.4 to 3.0 moles of halogenomethane phosphonate ions as etherifying agent are caused to react in from about 3 to 50 parts by weight, per part by weight of the cellulose, of a mixture which is composed of an inert, preferably water-miscible organic solvent and water and in which the proportion of water ranges from about 2 to 60 percent by weight, the reaction is continued until the phosphonomethyl cellulose has a DS of at least about 0.13.
    • 公开了一种在水性碱性介质中由纤维素和卤代甲烷膦酸或其盐或酸衍生物之一制备纤维素的水溶性膦酰基甲基醚的方法。 该方法使得对于每摩尔纤维素,使约0.1至15摩尔氢氧根离子和约0.4-3.0摩尔作为醚化剂的卤代甲烷膦酸根离子从约3到 50重量份,每重量份的纤维素,由惰性的,优选与水混溶的有机溶剂和水组成的混合物,其中水的比例为约2-60重量%,反应 直到膦酰基甲基纤维素具有至少约0.13的DS。