Adhesive for insulative articles

Patent metadata

Field	Value
Publication number	US-9849655-B2
Application number	US-201615158879-A
Country	US
Kind code	B2
Filing date	May 19, 2016
Priority date	Nov 27, 2013
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

An adhesive composition that improves structural integrity and insulative properties when applied to a cellulosic substrate is provided. The adhesive composition includes a plurality of microspheres and an emulsion-based polymer that has (i) an elastic modulus greater than 0.5 MPa in the range temperature range of 70° C. to 110° C.; (ii) an absolute log(E)/T slope of less than 0.05 in the range temperature range of 70° C. to 110° C.; and (iii) a tan d value less than 0.6 at 90° C.

First claim

The invention claimed is:

1. A waterborne-based adhesive comprising:
(a) a water-based polymer prepared by emulsion polymerization;
(b) a plurality of expandable microspheres; and
(c) optionally, an additive;
wherein the water-based polymer has (i) an elastic modulus greater than 0.5 MPa in the range temperature range of 70° C. to 110° C.; (ii) an absolute log(E)/T slope of less than 0.05 in the range temperature range of 70° C. to 110° C.; and (iii) a tan d value less than 0.6 at 90° C.

2. The waterborne-based adhesive of claim 1 , wherein the water-based polymer has (i) modulus of 5 MPa at 85° C. to 100° C.

3. The waterborne-based adhesive of claim 1 , wherein the water-based polymer is selected from the group consisting of emulsion-based polymer selected from the group consisting of vinyl acetate ethylene dispersion, polyvinyl acetate, polyvinyl acetate polyvinyl alcohol, dextrin stabilized polyvinyl acetate, polyvinyl acetate copolymers, vinyl acetate-ethylene copolymers, vinylacrylic, styrene acrylic, acrylic, styrene butyl rubber, polyurethane and mixtures thereof.

4. The waterborne-based adhesive of claim 1 , wherein the expandable microspheres have a hydrocarbon core and a polyacrylonitrile shell.

5. The waterborne-based adhesive of claim 1 , wherein the expandable microspheres begin to expand at a temperature of about 80° C. to about 100° C.

6. The waterborne-based adhesive of claim 1 , wherein the expandable microspheres have a maximum expansion temperature of about 120° C. to about 130° C.

7. The waterborne-based adhesive of claim 1 , further comprising a crosslinker, defoamer, preservative, surfactant, rheology modifier, filler, pigment, dye, stabilizer, polyvinyl alcohol, humectant, and mixtures thereof.

8. The waterborne-based adhesive of claim 1 , wherein the additive is selected from the group consisting of tackifiers, plasticizers, crosslinker, and mixtures thereof.

9. The waterborne-based adhesive of claim 8 , wherein the crosslinker is selected from the group consisting of aluminum nitrate, zirconium acetate, ammonium zirconyl carbonate and mixtures thereof.

10. The waterborne-based adhesive composition of claim 1 , wherein the adhesive further comprises an accelerator that is a multivalent water-soluble salt.

11. The waterborne-based adhesive composition of claim 10 , wherein the multivalent water-soluble salt is selected from the group consisting of aluminum nitrate, zirconium acetate, ammonium zirconyl carbonate and mixtures thereof.

12. A process for forming an article comprising the steps of:
(a) preparing a composition comprising:
(1) a water-based polymer prepared by emulsion polymerization that has (i) an elastic modulus greater than 0.5 MPa in the range temperature range of 70° C. to 110° C.; (ii) an absolute log(E)/T slope of less than 0.05 in the range temperature range of 70° C. to 110° C.; and (iii) a tan d value less than 0.6 at 90° C.; and
(2) a plurality of expandable microspheres;

(b) applying the composition onto a substrate, which is a paper, paperboard or wood;
(c) drying the composition to substantially remove the water; and
(d) expanding the composition.

13. The process of claim 12 , wherein steps (c) and (d) are simultaneously combined.

14. The process of claim 12 , wherein the composition is applied in a pattern.

15. The process of claim 14 , wherein the pattern is a series of dots, stripes, waves, checkerboards, or a polyhedron shape that have substantially a flat base.

16. An article comprising a cellulosic substrate and a composition comprising:
(a) a water-based polymer prepared by emulsion polymerization that has (i) an elastic modulus greater than 0.5 MPa in the range temperature range of 70° C. to 110° C.; (ii) an absolute log(E)/T slope of less than 0.05 in the range temperature range of 70° C. to 110° C.; and (iii) a tan d value less than 0.6 at 90° C.; and
(b) a plurality of expandable microspheres.

17. The article of claim 16 , wherein the water-based polymer is selected from the group consisting of emulsion-based polymer selected from the group consisting of vinyl acetate ethylene dispersion, polyvinyl acetate, polyvinyl acetate polyvinyl alcohol, dextrin stabilized polyvinyl acetate, polyvinyl acetate copolymers, vinyl acetate-ethylene copolymers, vinylacrylic, styrene acrylic, acrylic, styrene butyl rubber, polyurethane and mixtures thereof.

18. The article of claim 17 , wherein the cellulosic substrate is a fiberboard, corrugated board, solid bleached boards, kraft paper or coated paper.

19. The article of claim 16 is a multilayer substrate.

20. The multilayer substrate of claim 19 is a cup, food container, case, carton, bag, box, lids, envelope, wrap or clamshell.

Assignees

• Henkel IP & Holding GmbH

Inventors

• Huang Tianjian
• Thompson Kristina
• Waski Daniel
• Getty Kris

Classifications

• B32B2439/00

  Containers; Receptacles · CPC title

• B32B2255/12

  on paper layer · CPC title

• B32B2439/70

  Food packaging · CPC title

• C09J109/06

  Copolymers with styrene · CPC title

• C09J131/04 Primary

  Homopolymers or copolymers of vinyl acetate · CPC title