Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1987-03-31
1988-03-15
Griffin, Ronald W.
Paper making and fiber liberation
Processes and products
Non-fiber additive
162158, 162177, 162178, 536 43, 536111, 536114, 536 50, 536 41, 536 44, 536 45, 536 52, 536 84, C08B 1100, D21H 328, D21H 512
Patent
active
047311622
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 os 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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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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