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    • 8. 发明授权
    • Polysaccharides substituted with polycarboxylated moieties
    • 被多羧基部分取代的多糖
    • US5770711A
    • 1998-06-23
    • US723799
    • 1996-09-30
    • Sharon Linda GreeneRosann Marie KaylorKenneth Raymond Smith
    • Sharon Linda GreeneRosann Marie KaylorKenneth Raymond Smith
    • A61L15/28A61L15/62C08B11/12C08B15/00D06M13/11D06M13/192D21C9/00D21H11/20C08B15/10C08B37/00D21H13/04
    • D21H11/20A61L15/28A61L15/62C08B11/12C08B15/005D06M13/11D06M13/192D21C9/005
    • A derivatized polysaccharide in which at least a portion of the active hydrogens originally present in the polysaccharide are substituted by monovalent aliphatic groups containing at least two carboxylic acid groups to an extent sufficient to provide a degree of substitution of at least about 0.1. The monovalent aliphatic groups contain from 4 to about 10 carbon atoms. The polysaccharide may be cellulose. At least a portion of the carboxylic acid groups present in the derivatized polysaccharide may be crosslinked permanently or reversibly. The monovalent aliphatic groups containing at least two carboxylic acid groups may be derived from 2,3-epoxysuccinic acid; 1,2-epoxypropane-1,2,3-tricarboxylic acid; 2-(epoxyethyl)-succinic acid; or mixtures thereof. Also provided is a method of preparing a derivatized polysaccharide. The method involves providing a polysaccharide; dispersing the polysaccharide in a strongly alkaline aqueous alcohol solution; adding to the dispersion an excess of an aliphatic polycarboxylic acid having an epoxy group, wherein the aliphatic polycarboxylic acid contains from 4 to about 10 carbon atoms; and heating the dispersion at a temperature and for a time sufficient to permit the reaction of epoxy groups of the aliphatic polycarboxylic acid with active hydrogens present in the polysaccharide to an extent sufficient to result in a degree of substitution of at least about 0.1. The present invention further provides a paper containing an amount of the derivatized cellulose described above sufficient to provide improved strength characteristics to the paper, compared with an otherwise identical paper which lacks the derivatized cellulose.
    • 最初存在于多糖中的活性氢的至少一部分被含有至少两个羧酸基团的一价脂族基团取代至足以提供至少约0.1的取代度的衍生多糖。 一价脂族基团含有4至约10个碳原子。 多糖可以是纤维素。 存在于衍生化多糖中的羧酸基团的至少一部分可以永久地或可逆地交联。 含有至少两个羧酸基团的一价脂族基团可以衍生自2,3-环氧琥珀酸; 1,2-环氧丙烷-1,2,3-三羧酸; 2-(环氧乙基) - 琥珀酸; 或其混合物。 还提供了制备衍生化多糖的方法。 该方法包括提供多糖; 将多糖分散在强碱性醇水溶液中; 向所述分散体中加入过量的具有环氧基的脂族多元羧酸,其中所述脂肪族多元羧酸含有4至约10个碳原子; 并在足以允许脂族多元羧酸的环氧基与多糖中存在的活性氢反应的温度和时间下加热分散体至足以导致至少约0.1的取代度的程度。 本发明还提供了一种含有上述衍生纤维素量的纸,足以与纸张相比提供改善的强度特性,与缺乏衍生纤维素的其它相同的纸相比。