Starch-based adhesive compositions and use thereof
View Patent ↗An improved adhesive composition having increased bond strength between a celluosic board and plastic film substrate is provided. The adhesive composition having improved adhesion includes a modified starch component, polyethylenimine and water. Articles having improved adhesion and methods of making the articles having improved adhesion are also provided.
1. An article comprising at least two substrates and an adhesive composition between them comprising:
(A) a modified starch;
(B) a polyethylenimine; and
(C) water;
wherein the ratio of the modified starch to the polyethylenimine is 1,000-5,000:100;
wherein the pH of the adhesive composition ranges from 7.5 to 8.0; and
wherein at least one substrate is a cellulosic board and a second substrate is a plastic film.
2. The article of claim 1 wherein the cellulosic board is a kraft paper.
3. The article of claim 1 wherein the plastic film is selected from the group consisting of polyamide; polyolefin, biaxially oriented polypropylene, polyethylene terephthalate, polytrimethylene; polyvinyl chloride; and polystyrene.
4. The article of claim 3 wherein the plastic film is surface treated with corona treatment.
5. The article of claim 3 wherein the corona treatment is higher than 38 dyne/cm.
6. The article of claim 4 wherein the plastic film is polyolefin.
7. The article of claim 5 wherein the polyolefin is a corona treated polyethylene or polypropylene film.
8. The article of claim 7 which is a multiwall bag.
9. The article of claim 7 which is an envelope.