Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Patent
1985-07-24
1987-06-23
Griffin, Ronald W.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
162158, 536 41, 536 44, 536 45, 536 50, 536 52, 536 84, 536111, 536114, C08B 1100, C08B 1506, C08B 3108, C08B 3700
Patent
active
046753940
ABSTRACT:
Polysaccharide aldehydes having the general structure ##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. R is (CH.sub.2).sub.n or a divalent aromatic group and n is 0 or greater; R.sup.1, R.sup.6, and R.sup.7 are hydrogen or an organic group; R.sup.2, R.sup.5, and R.sup.8 are (CH.sub.2).sub.m with m being 1-6; R.sup.3 and R.sup.4 are hydrogen or a lower alkyl; Y 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.11, 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.
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Collect. Czech. Chem. Commun. 1984 49(4) 821-7 CA 101:112625t.
Jobe Patrick G.
Solarek Daniel B.
Tessler Martin M.
Griffin Ronald W.
Kelley Margaret B.
National Starch and Chemical Corporation
Szala Edwin M.
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