C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
260/212, 9/42
C08B 11/18 (2006.01) C08B 11/04 (2006.01) C08B 31/12 (2006.01) C08B 31/14 (2006.01) C08B 37/00 (2006.01) D21H 17/24 (2006.01) D21H 17/28 (2006.01) D21H 21/18 (2006.01)
Patent
CA 1305961
POLYSACCHARIDE DERIVATIVES CONTAINING ALDEHYDE GROUPS, THEIR PREPARATION FROM THE CORRESPONDING ACETALS AND USE AS PAPER ADDITIVES ABSTRACT OF THE DISCLOSURE Polysaccharide aldehydes having the formula Image (I) or Sacch-O-CH2-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 non- oxidative method which involves reacting the polysaccharide base, in the presence of alkali, with a derivatizing acetal reagent having the general structure Image 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.
561924
Billmers Robert L.
Del Guidice David M.
Leake Craig
Tessler Martin M.
Ablestik Laboratories
Borden Ladner Gervais Llp
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