Waterborne adhesives for reduced basis weight multilayer substrates and use thereof

Patent metadata

Field	Value
Publication number	US-9657200-B2
Application number	US-201313826451-A
Country	US
Kind code	B2
Filing date	Mar 14, 2013
Priority date	Sep 27, 2012
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

The adhesive composition comprising emulsion polymers and microspheres and articles made therefrom are provided. The adhesive is particularly suitable for packages for consumer products that provide sufficient strength and thermal insulation while reducing the overall basis weight of the substrates.

First claim

The invention claimed is:

1. An article comprising a first substrate, a second substrate, and an adhesive interposed between the two substrates comprising:
(a) an 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, styrene butyl rubber, polyurethane and mixtures thereof;
(b) about a plurality of microspheres, wherein the microspheres have a volume of about 10 to about 40 V/V % in the adhesive; and

(c) optionally, water, plasticizer, preservative;
wherein the article has a substantially similar thermal insulation loss with about 26% decrease in substrate basis weight than an article without any microspheres; and
wherein the article is a cup, food container, case, carton, bag, box, envelope, wrap or clamshell.

2. The article of claim 1 , wherein the thermal insulation loss is less than about 2° C. at 30 seconds and ¾ inch away from a heat source.

3. The article of claim 1 , wherein the basis weight of the substrates range from 2 to about 35 pounds per 1000 ft 2 .

4. The article of claim 1 , wherein the first and the second substrate are composed of fiberboard, corrugated board, solid bleached boards, kraft paper, coated paper or oriented polypropylene film.

5. The article of claim 4 wherein the first and the second substrate are kraft paper or coated paper.

6. The article of claim 4 wherein the boards and papers comprise a portion of recycled fiber.

7. The article of claim 1 , wherein the emulsion-based polymer is selected from the group consisting of vinyl acetate ethylene dispersion and polyvinyl acetate.

8. The article of claim 1 , wherein the plurality of microspheres are present in an amount of from about 0.5 wt % to about 5 wt %, based on the total weight of the adhesive.

9. The article of claim 1 , wherein the microspheres are expandable polymeric microspheres.

10. The article of claim 9 , wherein the microspheres have a temperature expansion (T exp ) of about 80° C. to about 135° C.

11. The article of claim 9 , wherein the microspheres have a maximum expansion temperature (T max ) of about 120° C. to about 200° C.

12. The article of claim 1 , wherein the microspheres are pre-expanded polymeric microspheres.

13. The article of claim 1 , wherein the adhesive further comprises a filler, pigment, dye, stabilizer, rheology modifier, polyvinyl alcohol, humectant or a mixture thereof.

Assignees

• Henkel IP & Holding GmbH

Inventors

• Huang Tianjian
• Thompson Kristina
• Waski Daniel
• Meccia John

Classifications

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• B32B2255/10

  on synthetic resin layer or on natural or synthetic rubber layer · CPC title

• B32B2439/06

  Bags, sacks, sachets · CPC title

• B32B2307/306

  Resistant to heat · CPC title

• D21H17/36

  Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters · CPC title