High-speed starch-based corrugating adhesive containing a carrier phase comprised of starch, modified starch or dextrin and polyvinyl alcohol
AssigneeCPC International Inc.
InventorsLarry E. Fitt, James J. Pienkowski, Jack R. Wallace
Life of this patent
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Abstract
A high speed corrugating adhesive having a carrier phase comprised of starch, modified starch or dextrin and polyvinyl alcohol in an aqueous emulsion wherein a cold water soluble, partially hydrolyzed, polyvinyl alcohol is used as a starting material. The polyvinyl alcohol is further hydrolyzed in situ to a degree of hydrolysis of more than about 95% by heating it in the presence of water, caustic, and starch, modified starch or dextrin. The carrier phase is admixed with a boron containing compound and a suspension of water and starch to prepare the corrugating adhesive for use in a corrugating machine.
Claims10
A corrugating adhesive composition which in an aqueous emulsion comprises water;
- about 0.04 to about 3 parts per 100 parts of adhesive of a cold water soluble polyvinyl alcohol which has been hydrolyzed in situ to a degree of hydrolysis of more than about 95%;
- about 2 to about 10 parts per 100 parts of the corrugating adhesive composition of a component selected from the group consisting of starch, modified starch and dextrin;
- sufficient caustic to provide an alkaline pH;
- about 10 to about 30 parts of starch per 100 parts of the corrugating adhesive composition;
- and about 0.3 to about 1 part of a boron containing compound .per 100 parts of the corrugating adhesive composition.
A carrier phase composition for use in a corrugating adhesive composition which in an aqueous emulsion comprises water;
- about 0.1 to about 10 parts per 100 parts of the carrier phase composition of a cold water soluble polyvinyl alcohol which has been hydrolyzed in situ to a degree of hyrdolysis of more than about 95%;
- about 5 to about 30 parts per 100 parts of the carrier phase composition of a component selected from the group consisting of starch, modified starch and dextrin;
- and sufficient caustic to provide an alkaline pH.
Dependencies are inferred from the claim text.