C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/1347, 117/31
C08L 51/02 (2006.01) C08L 89/04 (2006.01) C09J 7/04 (2006.01) C09J 103/00 (2006.01) C09J 189/00 (2006.01)
Patent
CA 1054279
ABSTRACT OF THE DISCLOSURE Adhesive formulation using acid-hydrolyzed, derivatized waxy maize starch as a component to replace animal glue in remoistenable pregummed tape formulations. Wet tack strength is equal or better than "all-animal glue" adhesives presently used, especially for short open times In on embodiment, waxy maize starch is first acid hydrolyzed and then copolymerized with acrylamide monomer using a free radical initiator in n aqueous system. In a second embodiment, acid-hydrolyzed, cyanoethylated waxy maize provides the major adhesive ingredient which replace a substantial portion of the animal glue in the adhesive composition. It is also contemplated that substantially all of the animal glue is the new formulation can be replaced for certain applications with a synthetic organic compound such as polyvinyl alcohol These combination vegetable-animal base adhesives and the vegetable-PVA type adhesive may be used to replace animal glue based adhesives, and provide improved machinability, less odor, easier remoistenability under cold room conditions and improved aging. Of the many modified starch combinations tested, the acid-hydrolyzed, cyanoethylated starch derivative and acid-hydrolyzed acrylamide-starch graft copolymers performed the be-t, especially in combination with small amounts of animal glue. It is also contemplated that the waxy starch-acrylamide copolymer can be used in paper sizing or coating binder applications.
195990
Bomball William A.
Swift Thomas G.
LandOfFree
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