Adhesive articles and methods

Patent metadata

Field	Value
Publication number	US-12305095-B2
Application number	US-201917309341-A
Country	US
Kind code	B2
Filing date	Dec 13, 2019
Priority date	Dec 14, 2018
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A pressure sensitive adhesive article that includes: a backing having two major surfaces, at least one of which has a pressure sensitive adhesive layer disposed thereon, the pressure sensitive adhesive layer having an average thickness of 25 microns to 50 microns and including: a styrene-isoprene-containing block copolymer including a styrene-isoprene diblock copolymer and a styrene-isoprene-styrene triblock copolymer; a tackifier; and an oil; an article that includes recycled corrugate having the pressure sensitive adhesive article adhered thereto; a method of sealing a package using the pressure sensitive adhesive article; and a method of making the pressure sensitive adhesive article.

First claim

What is claimed is:

1. A pressure sensitive adhesive article comprising:
a backing having two major surfaces, at least one of which has a pressure sensitive adhesive layer disposed thereon, wherein the pressure sensitive adhesive layer has an average thickness of 25 microns to 50 microns and comprises: a styrene-isoprene-containing block copolymer comprising a styrene-isoprene (SI) diblock copolymer and a styrene-isoprene-styrene (SIS) triblock copolymer, wherein: the total amount of styrene-isoprene diblock copolymer is 15 wt-% to 85 wt-%, based on the total weight of SI diblock and SIS triblock copolymers; and the total amount of styrene is 10 wt-% to 24 wt-%, based on the total weight of styrene and isoprene;
a tackifier; and
an oil in an amount of 20 to 200 parts per one hundred parts of the styrene-isoprene-containing block copolymer;
wherein the pressure sensitive adhesive demonstrates a creep compliance at 30 minutes of greater than 2.0×10− 4 Pa− 1 .

2. The pressure sensitive adhesive article of claim 1 wherein the pressure sensitive adhesive demonstrates a holding power to stainless steel of 10 minutes to 1000 minutes.

3. The pressure sensitive adhesive article of claim 1 wherein the pressure sensitive adhesive has a Fox glass transition temperature (Tg) of −30° C. to 0° C.

4. The pressure sensitive adhesive article of claim 1 wherein the total amount of styrene-isoprene diblock copolymer is 55 wt-% to 85 wt-%, based on the total weight of SI diblock and SIS triblock copolymers.

5. The pressure sensitive adhesive article of claim 1 wherein the pressure sensitive adhesive comprises a tackifier in an amount of 100 parts to 365 parts per one hundred parts styrene-isoprene-containing block copolymer.

6. The pressure sensitive adhesive article of claim 1 wherein the pressure sensitive adhesive comprises a styrene-isoprene-containing copolymer in an amount of 10 wt-% to 40 wt-%, based on the total weight of the pressure sensitive adhesive.

7. The pressure sensitive adhesive article of claim 1 wherein the styrene-isoprene-containing block copolymer is a linear or radial block copolymer.

8. The pressure sensitive adhesive article of claim 1 wherein the styrene-isoprene-containing block copolymer has a melt flow index of 5 g/10 min to 30 g/10 min.

9. The pressure sensitive adhesive article of claim 1 wherein the backing comprises a polyethylene, a polypropylene, a polyester, a rubber, a vinyl, a paper, a polylactic acid, or a combination thereof.

10. The pressure sensitive adhesive article of claim 1 which is nonremovable.

11. The pressure sensitive adhesive article of claim 1 which is an adhesive tape or an adhesive label.

12. The pressure sensitive adhesive article of claim 11 which forms a destructive bond to recycled corrugate.

13. An article comprising recycled corrugate having a pressure sensitive adhesive article of claim 1 adhered thereto.

14. A sealed article comprising:
a first portion of recycled corrugate;
a second portion of recycled corrugate;
a pressure sensitive article adhered to both the first and second portions, the pressure sensitive article comprising:
a backing having two major surfaces, at least one of which has a pressure sensitive adhesive layer disposed thereon;
wherein the pressure sensitive adhesive layer has an average thickness of 25 microns to 50 microns and comprises:
a styrene-isoprene-containing block copolymer comprising a styrene-isoprene (SI) diblock copolymer;
a styrene-isoprene-styrene (SIS) triblock copolymer;
wherein: the total amount of styrene-isoprene diblock copolymer is 15 wt-% to 85 wt-%, based on the total weight of SI diblock and SIS triblock copolymers; and
the total amount of styrene is 10 wt-% to 24 wt-%, based on the total weight of styrene and isoprene;

a tackifier; and
an oil in an amount of 20 to 200 parts per one hundred parts of the styrene-isoprene-containing block copolymer.

15. A method of sealing a package, the method comprising: providing packaging material comprising recycled corrugate; and
sealing the packaging material with a pressure sensitive adhesive article of claim 1 .

16. A method of making a pressure sensitive adhesive article, the method comprising: providing a backing having two major surfaces; providing a coatable adhesive comprising: a styrene-isoprene-containing block copolymer comprising a styrene-isoprene (SI) diblock copolymer and a styrene-isoprene-styrene (SIS) triblock copolymer, wherein: the total amount of styrene-isoprene diblock copolymer is 15 wt-% to 85 wt-%, based on the total weight of SI diblock and SIS triblock copolymers; and the total amount of styrene is 10 wt-% to 24 wt-%, based on the total weight of styrene and isoprene;
a tackifier; and
an oil in an amount of 20 to 200 parts per one hundred parts of the styrene-isoprene-containing block copolymer;
applying the coatable adhesive composition to at least one major surface of the backing;
and exposing the coatable adhesive composition to conditions effective to harden the composition and form a layer of a pressure sensitive adhesive having an average thickness of 25 microns to 50 microns; wherein the pressure sensitive adhesive demonstrates a creep compliance at 30 minutes of greater than 2.0×10− 4 Pa− 1 .

Assignees

• 3M Innovative Properties Company

Inventors

• Tapio Scott M
• Hyde Patrick D
• Imsande Jeffrey M
• Ray Terry R
• Johnson Christopher R

Classifications

• C09J153/00

  Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers · CPC title

• C09J2491/00

  Presence of oils, fats or waxes · CPC title

• C09J2453/00

  Presence of block copolymer · CPC title

• C09J7/387 Primary

  Block-copolymers · CPC title