Abstract An improved, viscosity-stable cooked flour-containing Stein-Hall type corrugated paperboard adhesive having an uncooked slurry portion and a cooked paste portion as a carrier therefor wherein the slurry portion comprises an amount sufficient to provide the requisite tack to the mixture of a smooth, stable homogeneous colloidal co-solution, substantially free of undissolved fiber, of both the protein and starch fractions of a proteinaceous grain flour, the protein fraction being substantially non-degraded and the starch fraction being essentially a chemically unmodified starch or as molecular weight reduced starch, which is chemically unmodified, the resultant adhesive being viscosity-stable with substantially higher tack than corresponding normally gellable conventional adhesives of the same flour content.
An adhesive according to claim 1 wherein the uncooked portion is a starch slurry.
Claim 2
Dependent Claim
18 words
An adhesive according to claim 2 wherein the starch of the starch slurry is corn or wheat starch.
Claim 3
Dependent Claim
15 words
An adhesive according to claim 1 wherein the flour is corn, milo or wheat flour.
Claim 4
Dependent Claim
12 words
An adhesive according to claim 4 wherein the flour is corn, flour.
Claim 5
Dependent Claim
20 words
An adhesive according to claim 1 wherein the starch fraction of the flour is present essentially as chemically unmodified starch.
Claim 6
Dependent Claim
20 words
An adhesive according to claim 1 containing an amount of formaldehyde effective to render the mixture stable to microbiological degradation.
Claim 7
Dependent Claim
13 words
An adhesive according to claim 1 wherein the adhesive comprises caustic and borax.
Claim 8
Dependent Claim
30 words
An adhesive according to claim 1 wherein the uncooked portion is a starch slurry the solids of which comprise about one-half to eleven-twelfths of the total solids of the mixture.
Claim 9
Dependent Claim
20 words
An adhesive according to claim 8 wherein the starch fraction of the flour is present essentially as chemically unmodified starch.
Claim 10
Dependent Claim
21 words
An adhesive according to claim 10 wherein the flour paste is a clear transparent solution, substantially free from undissolved flour particles.
Claim 11
Dependent Claim
12 words
An adhesive according to claim 10 wherein the flour is corn flour.
Claim 12
Dependent Claim
23 words
An adhesive according to claim 12 wherein the mixture contains an amount of formaldehyde effective to render the mixture stable to microbiological degradation.