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    • 82. 发明授权
    • Acetals useful for the preparation of polysaccharide derivatives
    • 用于制备多糖衍生物的缩醛
    • US4804769A
    • 1989-02-14
    • US037282
    • 1987-04-10
    • Daniel B. SolarekPatrick G. JobeMartin M. TesslerRobert L. BillmersDiane J. LambJohn J. Tsai
    • Daniel B. SolarekPatrick G. JobeMartin M. TesslerRobert L. BillmersDiane J. LambJohn J. Tsai
    • C07H15/04C07H15/12C08B11/04C08B11/08C08B11/14C08B31/12C08B37/00C08B37/14D21H17/24D21H17/25D21H17/28D21H17/31C07D319/06
    • C08B11/14C08B11/04C08B31/12C08B31/125C08B37/0096D21H17/24D21H17/25D21H17/28D21H17/31
    • Polysaccharide aldehydes having the formula Sacch-O-CH.sub.2 -CH.dbd.CH-CHO, Sacch-O-CH.sub.2 -C.tbd.C-CHO, ##STR1## such as starch, cellulose, and gum aldehydes, are useful for imparting wet, dry, or temporary wet strength to paper. They are prepared by a non-oxidative method which involves reacting the polysaccharide base, in the presence of alkali, with a derivatizing acetal reagent having the general structure ##STR2## and then hydrolyzing the acetal by adjusting the pH to less than 7, preferably 2-4. In the formulas, n is 1-3; R.sup.11 and R.sup.12 are independently an alkyl, aryl, aralkyl, or alkaryl group when n is 1, R.sup.11 or R.sup.12 is one of the groups when n is 2, or R.sup.11 and R.sup.12 are not present when n is 3; R.sup.13 is an alkyl group, optionally containing an ether linkage, or an aralkyl group; R.sup.14 and R.sup.15 are individually a hydrogen or a methyl group; R.sup.16, R.sup.17, and R.sup.18 are individually an alkyl group; Y.sup.- is an anion; Z is an organic group capable of reacting with the polysaccharide base to form an ether derivative and selected from the group consisting of an epoxide, ethylenically unsaturated group, halohydrin, and halogen; R.sup.19, if present, is a divalent organic group containing no reactive substiuents; and A and A' are lower alkyls or together form at least a 5-membered cyclic acetal.
    • 具有式Sacch -O-CH 2 -CH = CH-CHO,Sacch -O-CH 2 -C 3OND C-CHO,图像>< IMAGE>< IMAGE>和+ TR< IMAGE>的多糖醛 例如淀粉,纤维素和醛醛可用于赋予纸张湿,干或临时湿强度。 它们通过非氧化方法制备,其包括在碱存在下使多糖碱与具有一般结构“IMAGE”的衍生化缩醛试剂反应,然后通过将pH调节至小于7,优选2来水解缩醛 -4。 在式中,n为1-3; 当n为1时,R11和R12独立地为烷基,芳基,芳烷基或烷芳基,当n为2时,R11或R12为基团之一,当n为3时,R11和R12不存在; R13是任选含有醚键或芳烷基的烷基; R 14和R 15分别为氢或甲基; R16,R17和R18各自为烷基; Y-是阴离子; Z是能够与多糖基反应形成醚衍生物并选自环氧化物,烯属不饱和基,卤代醇和卤素的有机基团; R19如果存在,是不含反应性残基的二价有机基团; 并且A和A'是低级烷基或一起形成至少5元环缩醛。
    • 84. 发明授权
    • Manufacturing method for cellulose ether having high degree of
substitution
    • 具有高取代度的纤维素醚的制造方法
    • US4582899A
    • 1986-04-15
    • US720927
    • 1985-04-08
    • Hiroyuki Nakamura
    • Hiroyuki Nakamura
    • C08B11/04C08B11/187C08B13/00C08B11/00C08B11/16C08B11/18
    • C08B11/04C08B11/187C08B13/00
    • A manufacturing method for cellulose ether having a high degree of substitution characterized in that an etherifying agent represented by a general formula RCH.sub.2 X (where R is aromatic group, heterocyclic group, vinyl group or ethynyl group or the same group substituted and X is chlorine or bromine) is reacted with a uniform solution of cellulose acetate having a degree of substitution of 2.0 and over in an organic solvent in the presence of a base to manufacture a highly substituted cellulose ether having a degree of substitution of 2.0 and over per anhydrous glucose unit by a one stage reaction at a good yield.As a general method for manufacturing cellulose ether, a method for reacting an etherifying agent with alkali cellulose is now in use. For the general method, several improved methods have been proposed. However, it is difficult to manufacture cellulose ether having a degree of substitution of 2.5 and over by a one stage reaction using the general method. As manufacturing methods for cellulose ether other than the general method, a method for using a solvent-soluble cellulose derivative as the raw material and a method for using a special solvent in which cellulose is soluble were proposed. However, the former had a defect of a low yield and the latter had a defect of too long a reaction time.
    • 具有高取代度的纤维素醚的制造方法,其特征在于,由通式RCH2X(其中R是芳族基,杂环基,乙烯基或乙炔基或与之相同基团取代的醚化剂)和X是氯或溴 )与有机溶剂中的取代基为2.0以上的醋酸纤维素的均匀溶液在碱的存在下反应,以通过以下方式制备高度取代的取代度为2.0的纤维素醚 一个阶段的反应以良好的收益率。 作为制造纤维素醚的一般方法,现在使用醚化剂与碱纤维素反应的方法。 对于一般方法,已经提出了几种改进的方法。 然而,通过一般方法,难以通过一步反应制造取代度为2.5以上的纤维素醚。 作为除一般方法以外的纤维素醚的制造方法,提出了使用溶剂可溶性纤维素衍生物作为原料的方法和使用其中可溶解纤维素的特殊溶剂的方法。 然而,前者具有低产量的缺点,后者具有反应时间太长的缺点。