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US 8,465,581 B2Granted
Stable acid denatured soy/urea adhesives and methods of making same
AssigneeHercules Incorporated
InventorsJames M. Wescott, Michael J. Birkeland
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AssigneeHercules Incorporated
InventorsJames M. Wescott, Michael J. Birkeland
Estimating the term…
The present invention provides an improved method of producing a stable acid denatured soy/urea adhesive having improved wet and dry strengths, with more efficient production and lower production costs. The method comprises combining urea with soy flour that has been acid treated until denatured and substantially free from urease activity. The soy flour is preferably lowered to a pH of 2.0 to 4.0 for at least 1 minute. Optionally, the method may also include adding a crosslinking agent, diluent or both to the soy flour/urea adhesive and/or adding an emulsified or dispersed polymer. Adhesives and dispersions prepared according to the methods of this invention offer increased stability and strength properties.
A stable adhesive composition comprised of urea and soy flour in water wherein the urease present in the soy flour has been deactivated by an acid treatment, wherein the acid treatment comprises lowering the pH of the dispersed soy flour to less than 4.5 and greater than 2.0 for a period of at least 1 minute prior to combining it with urea;
Dependencies are inferred from the claim text.