Pressure-sensitive adhesive tape

Patent metadata

Field	Value
Publication number	US-11053415-B2
Application number	US-201916254953-A
Country	US
Kind code	B2
Filing date	Jan 23, 2019
Priority date	Jan 24, 2018
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

A pressure-sensitive adhesive tape comprises a backing layer having a first and a second surface; and a first pressure-sensitive adhesive layer affixed to the first surface; wherein the first pressure-sensitive adhesive layer has an adhesive strength of 2.0 N/10 mm to 9.0 N/10 mm in absence of a solvent and the pressure-sensitive adhesive tape has a tensile strength in longitudinal direction of 45 N/15 mm to 80 N/15 mm.

First claim

The invention claimed is:

1. A pressure-sensitive adhesive tape comprising
a backing layer having a first and a second surface; and
a first pressure-sensitive adhesive layer affixed to the first surface;
a second pressure-sensitive adhesive layer affixed to the second surface;
wherein:
the first pressure-sensitive adhesive layer has an adhesive strength of 2.0 N/10 mm to 9.0 N/10 mm in absence of a solvent,
the second pressure-sensitive adhesive layer has an adhesive strength of 2.0 N/10 mm to 8.0 N/10 mm in absence of the solvent, and
when a 10 mm×80 mm area of the first pressure-sensitive adhesive layer is wetted by three drops of the solvent, the adhesive strength of the first pressure-sensitive adhesive layer has a difference of 1% to 20% from the adhesive strength of the first pressure-sensitive adhesive layer in the absence of the solvent, and when a 10 mm×80 mm area of the second pressure-sensitive adhesive layer is wetted by three drops of the solvent, the adhesive strength of the second pressure-sensitive adhesive layer has a difference of 1% to 20% from the adhesive strength of the second pressure-sensitive adhesive layer in the absence of the solvent, the solvent being a water-based solvent or an emulsion-based solvent; and

the pressure-sensitive adhesive tape has a tensile strength in longitudinal direction of 45 N/15 mm to 80 N/15 mm.

2. The pressure-sensitive adhesive tape according to claim 1 , further comprising a primer layer sandwiched between the backing layer and the first pressure-sensitive adhesive layer.

3. The pressure-sensitive adhesive tape according to claim 2 , wherein the primer layer comprises a polyolefin polymer, a polyolefin elastomer polymer, an acrylic polymer or any combination thereof.

4. The pressure-sensitive adhesive tape according to claim 2 , wherein the pressure-sensitive adhesive tape has a shear adhesive strength of 23 N/19 mm×19 mm to 76 N/19 mm×19 mm in absence of a solvent.

5. The pressure-sensitive adhesive tape according to claim 1 , further comprising a release liner affixed to the first pressure-sensitive adhesive layer or the second pressure-sensitive adhesive layer.

6. The pressure-sensitive adhesive tape according to claim 1 , further comprising a primer layer sandwiched between the backing layer and the first pressure-sensitive adhesive layer; and
a release liner affixed to the first pressure-sensitive adhesive layer or the second pressure-sensitive adhesive layer.

7. The pressure-sensitive adhesive tape according to claim 6 , wherein the primer layer comprises a polyolefin polymer, a polyolefin elastomer polymer, an acrylic polymer or any combination thereof.

8. The pressure-sensitive adhesive tape according to claim 1 , wherein the backing layer comprises from 50% to 100% by weight of a paper material.

9. The pressure-sensitive adhesive tape according to claim 8 , wherein the acrylic polymer comprises a monomer unit, 70% to 100% by weight of the monomer unit being derived from 2-ethylhexyl acrylate.

10. The pressure-sensitive adhesive tape according to claim 1 , wherein the backing layer is impregnated with latex.

11. The pressure-sensitive adhesive tape according to claim 10 , wherein the acrylic polymer comprises a monomer unit, 70% to 100% by weight of the monomer unit being derived from 2-ethylhexyl acrylate.

12. The pressure-sensitive adhesive tape according to claim 1 , wherein the first pressure-sensitive adhesive layer comprises from 65% to 100% by weight of an acrylic polymer.

13. The pressure-sensitive adhesive tape according to claim 1 , wherein the second pressure-sensitive adhesive layer comprises from 65% to 100% by weight of an acrylic polymer.

14. The pressure-sensitive adhesive tape according to claim 1 , wherein the first pressure-sensitive adhesive layer has an adhesive strength of 2.0 N/10 mm to 5.0 N/10 mm in absence of a solvent.

15. The pressure-sensitive adhesive tape according to claim 1 , wherein the first pressure-sensitive adhesive layer has an adhesive strength of 2.0 N/10 mm to 6.0 N/10 mm in absence of a solvent.

16. The pressure-sensitive adhesive tape according to claim 1 , wherein the first pressure-sensitive adhesive layer has an adhesive strength of 2.0 N/10 mm to 7.0 N/10 mm in absence of a solvent.

17. The pressure-sensitive adhesive tape according to claim 1 , wherein the first pressure-sensitive adhesive layer has an adhesive strength of 3.0 N/10 mm to 9.0 N/10 mm in absence of a solvent.

18. The pressure-sensitive adhesive tape according to claim 1 , wherein the second pressure-sensitive adhesive layer has an adhesive strength of 2.0 N/10 mm to 7.0 N/10 mm in absence of a solvent.

19. The pressure-sensitive adhesive tape according to claim 1 , wherein the second pressure-sensitive adhesive layer has an adhesive strength of 3.0 N/10 mm to 8.0 N/10 mm in absence of a solvent.

20. The pressure-sensitive adhesive tape according to claim 1 , wherein the pressure-sensitive adhesive tape has an elongation ratio in longitudinal direction of 6%/15 mm to 20%/15 mm.

21. The pressure-sensitive adhesive tape according to claim 1 , wherein the pressure-sensitive adhesive tape has an elongation ratio in longitudinal direction of 6%/15 mm to 14%/15 mm.

22. The pressure-sensitive adhesive tape according to claim 1 , wherein the pressure-sensitive adhesive tape has an elongation ratio in longitudinal direction of 7%/15 mm to 15%/15 mm.

23. The pressure-sensitive adhesive tape according to claim 1 , wherein the pressure-sensitive adhesive tape has a tensile strength in longitudinal direction of 50 N/15 mm to 70 N/15 mm.

24. The pressure-sensitive adhesive tape according to claim 1 , wherein the backing layer has a tensile strength in longitudinal direction of from 40 N/15 mm to 65 N/15 mm.

25. The pressure-sensitive adhesive tape according to claim 1 , wherein the backing layer has an elongation ratio in longitudinal direction of 5%/15 mm to 12%/15 mm.

26. The pressure-sensitive adhesive tape according to claim 1 , wherein the first pressure-sensitive adhesive layer has an anchoring strength of 12.0 N/20 mm to 28.0 N/20 mm.

27. The pressure-sensitive adhesive tape according to claim 1 , wherein the second pressure-sensitive adhesive layer has an anchoring strength of 11.0 N/20 mm to 23.0 N/20 mm.

28. The pressure-sensitive adhesive tape according to claim 1 , wherein the pressure-sensitive adhesive tape has a shear adhesive strength of 23 N/19 mm×19 mm to 76 N/19 mm×19 mm in absence of a solvent.

Assignees

• Nitto Denko Mat Malaysia Sdn Bhd
• Nitto Denko Corp

Inventors

• Chai Lee Lee

Classifications

• C09J2301/302

  the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C · CPC title

• C09J2423/003

  in the primer coating · CPC title

• C09J2433/00

  Presence of (meth)acrylic polymer · CPC title

• C09J2301/124

  the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape · CPC title

• C09J2407/006

  in the substrate · CPC title