Polysaccharide derivatives containing aldehyde groups, their pre

Details Polysaccharide derivatives containing aldehyde groups, their pre Polysaccharide derivatives containing aldehyde groups, their pre

1987-04-03

1988-05-03

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

162177, 162178, D21H 320

Patent

active

047418044

ABSTRACT:
Polysaccharide aldehydes having the formula ##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 formula, 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 aryl, aralkyl, or alkaryl 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 substituents; and A and A' are lower alkyls or together form at least a 5-membered cyclic acetal.

REFERENCES:
patent: 2285490 (1942-06-01), Broderick
patent: 3087852 (1963-04-01), Hofreiter et al.
patent: 3453258 (1969-07-01), Parmerter et al.
patent: 4605702 (1986-08-01), Guerro et al.
patent: 4605718 (1986-08-01), Jansma et al.

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