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    • 1. 发明授权
    • Acetals useful for the preparation of polysaccharide derivatives
    • 用于制备多糖衍生物的缩醛
    • US4983748A
    • 1991-01-08
    • US290934
    • 1988-12-28
    • John J. TsaiPatrick G. JobeDiane J. LambRobert L. BillmrsMartin M. Tessler
    • John J. TsaiPatrick G. JobeDiane J. LambRobert L. BillmrsMartin M. Tessler
    • C08B11/14C08B31/12C08B37/14D21H17/25D21H17/28D21H17/31
    • C08B11/14C08B31/12D21H17/25D21H17/28D21H17/31
    • Polysaccharide aldehydes having the formula Sacch--O--CH.sub.2 --CH.dbd.CH--CHO, Saach--O--CH.sub.2 --C.tbd.C--CHO, ##STR1## 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-CH2-CH = CH-CHO,Saach-O-CH2-C 3BOND C-CHO的多糖醛,图像>< IMAGE>< IMAGE>>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。
    • 5. 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。