C - Chemistry – Metallurgy – 08 – B
Patent
C - Chemistry, Metallurgy
08
B
260/212, 260/351
C08B 15/00 (2006.01) C08B 31/12 (2006.01) D21H 21/20 (2006.01)
Patent
CA 1292986
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 Sacch-O-CH2-CH=CH-CHO, Saach-O-CH2-C=C-CHO, Image , Image , Image , Image , Image , Image , such as Image , Image ; 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 of general formula Image , R19 being a divalent organic group, and then hydrolyzing the acetal by adjusting the pH to less than 7, preferably 2 4. In the formulas, n is 1-3; R11 and R12 are independently an alkyl, aryl, aralkyl, or alkaryl group when n is 1, R11 or R12 is one of the groups when n is 2, or R11 and R12 are not present when n is 3; R13 is an alkyl group, optionally containing an ether linkage, or an aralkyl group; R14 and R15 are individually a hydrogen or a methyl group; R16, R17, and R18 are individually an alkyl group; 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; and A and A' are lower alkyls or together form at least a 5-membered cyclic acetal.
529698
Billmers Robert L.
Jobe Patrick G.
Lamb Diane J.
Solarek Daniel B.
Tessler Martin M.
Ablestik Laboratories
Borden Ladner Gervais Llp
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