Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Patent
1987-09-08
1988-11-29
Griffin, Ronald W.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
162158, 536 41, 536 43, 536 44, 536 45, 536 50, 536 52, 536 84, 536111, 536114, C08B 3102, C08B 3108, C08B 1104, C08B 3714
Patent
active
047882808
ABSTRACT:
Polysaccharide aldehydes having the formula ##STR1## or Sacch--O--CH.sub.2 --Ar--CHO (II) such as starch, cellulose, and gum aldehydes, are useful as paper additives for imparting strength and as the granular or gelatinized portion of a corrugating adhesive. Those having formula I are prepared by a nonoxidative 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 formula Ar is an aryl group, optionally containing an ether linkage, or an alkaryl group and A and A' are lower alkyls or together form at least a 5-membered cyclic acetal. The polysaccharide aldehydes are crosslinked by the addition of selected polyfunctional crosslinkers such as an aliphatic primary polyamine or polyketone.
REFERENCES:
patent: 3706633 (1972-12-01), Katchalski et al.
patent: 4158594 (1979-06-01), Becker et al.
patent: 4610761 (1986-09-01), Eklund et al.
patent: 4675394 (1987-06-01), Solarek et al.
patent: 4703116 (1987-10-01), Solarek et al.
Billmers Robert L.
Del Giudice David M.
Leake Craig
Tessler Martin M.
Griffin Ronald W.
Kelley Margaret B.
National Starch and Chemical Corporation
Szala Edwin M.
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