WATERBORNE TWO-PART ADHESIVES AND USE THEREOF
A waterborne, two-part adhesive composition having improved wet tack properties is disclosed. The two-part adhesive composition is particularly suitable for making laminates, including paperboard products.
1 . An adhesive comprising a reaction product of:
a. A composition A comprising polyethyleneimine in a polyvinyl alcohol solution having a pH value greater than about 9; and
b. A composition B comprising boric acid and polyvinyl alcohol stabilized ethylene-co-vinyl acetate emulsion polymer.
2 . The adhesive of claim 1 , wherein the composition A further comprises a biocide.
3 . The adhesive of claim 1 , wherein the composition B further comprises a plasticizer, defoamer, and biocide.
4 . The adhesive of claim 1 , wherein the wet tack of the reaction product is greater than 50 g/inch force at 2 seconds, measured by Texture Analyzer with 1 inch sample width, at compression speed of 2 mm/sec, compression force of 100 grams, and debonding speed of 10 mm/sec.
5 . A laminate comprising:
a. a substrate 1;
b. a substrate 2;
c. an adhesive comprising the reaction product of composition A and composition B,
wherein the composition A comprises polyethyleneimine in a polyvinyl alcohol solution having a pH value greater than about 9; and
wherein the composition B comprises boric acid and polyvinyl alcohol stabilized ethylene-co-vinyl acetate emulsion polymer.
6 . The laminate of claim 5 ,
wherein the substrate 1 is fiberboard, cardboard, kraft paper, fluted medium, linear medium, plastic film or foil; and
wherein the substrate 2 is fiberboard, cardboard, kraft paper, fluted medium or linear medium, plastic film or foil.
7 . The laminate of claim 5 ,
wherein the composition A further comprises a biocide; and
wherein the composition B further comprises a plasticizer, defoamer, and biocide.
8 . The laminate of claim 5 further comprising a substrate 3, selected from the group consisting of fiberboard, cardboard, kraft paper, fluted medium or linear medium, plastic film and foil.
9 . A method for forming a laminate comprising:
a. Preparing a composition A comprising polyethyleneimine in a polyvinyl alcohol solution having a pH value greater than about 9;
b. Preparing a composition B comprising boric acid and polyvinyl alcohol stabilized ethylene-co-vinyl acetate emulsion polymer;
c. Preparing a substate 1 having a first side and a second side;
d. Preparing a substrate 2 having a first side and a second side;
e. Applying the composition A on the first side of the substrate 1;
f. Applying the composition B on the second side of the substrate 2;
g. Mating the composition A on the first side of the substrate 1 to the composition B on the second side of the substrate 2 onto each other.
10 . The method of claim 9 , wherein the mating is conducted at temperature of the substrate less than 250° F.
11 . The method of claim 10 , wherein the mating is conducted at temperature less than 130° F.
12 . The method of claim 11 ,
wherein the substrate 1 is fiberboard, cardboard, kraft paper, fluted medium or linear medium, plastic film or foil; and
wherein the substrate 2 is fiberboard, cardboard, kraft paper, fluted medium or linear medium, plastic film or foil.
13 . An adhesive comprising a reaction product of
a. A composition C comprising hydroxyethyl cellulose stabilized polyvinyl acetate emulsion polymer and aminoborate compound; and
b. A composition D comprising polyvinyl alcohol stabilized ethylene vinyl acetate emulsion polymer and polyethyleneimine.
14 . The adhesive of claim 13 , wherein the composition C further comprises a defoamer and a biocide.
15 . The adhesive of claim 13 , wherein the composition D further comprises a defoamer, plasticizer, biocide.
16 . The adhesive of claim 13 , wherein the wet tack of the reaction product is greater than 50 g/inch force at 2 seconds, measure by Texture Analyzer, with 1 inch sample width, at compression speed of speed of 2 mm/sec, compression force of 100 grams, and debonding speed of 10 mm/sec.
17 . A laminate comprising:
a. a substrate 1;
b. a substrate 2;
c. an adhesive comprising the reaction product of composition C and composition D,
Wherein the adhesive C comprises polyvinyl acetate emulsion polymer and aminoborate compound; and
Wherein the adhesive D comprises polyvinyl alcohol stabilized ethylene vinyl acetate emulsion polymer and polyethyleneimine.
18 . The laminate of claim 17 ,
wherein the substrate 1 is fiberboard, cardboard, kraft paper, fluted medium, linear medium, plastic film or foil; and
wherein the substrate 2 is fiberboard, cardboard, kraft paper, fluted medium or linear medium, plastic film or foil.
19 . The laminate of claim 17 ,
wherein the adhesive C further comprises a defoamer and a biocide; and
wherein the adhesive D further comprises defoamer, plasticizer, biocide.
20 . The laminate of claim 17 further comprising a substrate 3, selected from the group consisting of fiberboard, cardboard, kraft paper, fluted medium or linear medium, plastic film and foil.
21 . A method for forming a laminate comprising
a. preparing a composition C comprising polyvinyl acetate emulsion polymer and aminoborate compound;
b. preparing a composition D comprising polyvinyl alcohol stabilized ethylene vinyl acetate emulsion polymer and polyethyleneimine;
c. preparing a substate 1 having a first side and a second side;
d. preparing a substrate 2 having a first side and a second side;
e. applying the adhesive C on the first side of the substrate 1;
f. applying the adhesive D on the second side of the substrate 2; and
g. mating the adhesive C on the first side of the substrate 1 to the adhesive D on the second side of the substrate 2 onto each other.
22 . The method of claim 21 , wherein the mating is conducted at temperature less than 250° F.
23 . The method of claim 22 , wherein the mating is conducted at temperature less than 130° F.
24 . The method of claim 21 ,
wherein the composition C further comprises a defoamer and a biocide; and
wherein the composition D further comprises defoamer, plasticizer, biocide.
25 . The method of claim 21 , wherein the substrate 1 is fiberboard, cardboard, kraft paper, fluted medium or linear medium, plastic film or foil; and
wherein the substrate 2 is fiberboard, cardboard, kraft paper, fluted medium or linear medium, plastic film or foil.