STRETCH RELEASABLE ADHESIVE TAPE

• US 20110126968A1
• Filed: 03/12/2009
• Published: 06/02/2011
• Est. Priority Date: 03/14/2008
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Emsiander, Jerffrey O., Averaerts, Albert I., Determan, Michael D., Seth, Jayshree, Purgett, Mark D., Bries, James L., Tran, Thu-Van T.
• Granted Patent: US 8,673,419 B2
• Time in Patent Office: Days
• US Class Current: 156/229
• CPC Class Codes: C09J 2301/308 the adhesive tape or sheet losing adhesive strength when being stretched, e.g. stretch adhesive
• CPC Class Codes: C09J 2423/006 in the substrate
• CPC Class Codes: C09J 2483/00 Presence of polysiloxane
• CPC Class Codes: C09J 7/243 Ethylene or propylene polymers
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: G02F 2202/28 Adhesive materials or arrangements
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/1471 Protective layer
• CPC Class Codes: Y10T 428/1476 Release layer
• CPC Class Codes: Y10T 428/24752 Laterally noncoextensive components
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/2852 Adhesive compositions
• CPC Class Codes: Y10T 428/2896 including nitrogen containing condensation polymer [e.g., polyurethane, polyisocyanate, etc.]

Abstract

An adhesive tape that is stretch releasable, articles that contain the adhesive tape, and uses of the adhesive tape are disclosed. The adhesive tapes include a backing layer that is adjacent to at least one pressure-sensitive adhesive layer. The backing layer typically is optically clear and includes a poly(alkylene)copolymer. The pressure-sensitive adhesive layer is a silicone-based adhesive composition. In many embodiments, the adhesive tape is optically clear.

Claims

1. An adhesive tape comprising:

a backing layer having a haze no greater than 5 percent and a luminous transmittance equal to at least 85 percent as measured using method ASTM D1003-07, the backing layer comprising a poly(alkylene)copolymer comprising a polymerized product of a reaction mixture comprising

(1) a first alkene selected from ethene, propene, or a mixture thereof; and

(2) a second alkene selected from a 1,2-alkene having 4 to 8 carbon atoms; and

(3) a metallocene catalyst; and

at least one pressure-sensitive adhesive layer adjacent to a major surface of the backing layer, the pressure-sensitive adhesive layer comprising a silicone-based adhesive composition, wherein the adhesive tape is stretchable at least 50 percent in a first direction without breaking.

2. The adhesive tape of claim 1, wherein the silicone-based adhesive composition comprises a silicone material selected from at least one silicone elastomer, silicone gum, or a mixture thereof.

3. The adhesive tape of claim 2, wherein the silicone material comprises at least one polydiorganosiloxane unit.

4. The adhesive tape of claim 2, wherein the silicone material is cured.

5. The adhesive tape of claim 2, wherein the silicone material is selected from an urea-based silicone copolymer, oxamide-based silicone copolymer, amide-based silicone copolymer, urethane-based silicone copolymer, cured silicone elastomer, cured silicone gum, or mixtures thereof.

6. The adhesive tape of claim 1, wherein the silicone-based adhesive composition further comprises a tackifying resin.

7. The adhesive tape of claim 1, wherein the silicone-based adhesive composition comprises (a) 30 to 90 weight percent silicone material selected from at least one silicone elastomer, silicone gum, or a mixture thereof and (b) 10 to 70 weight percent silicone tackifying resin.

8. The adhesive tape of claim 1, wherein the poly(alkylene)copolymer has a specific gravity in the range of 0.86 to 0.91.

9. The adhesive tape of claim 1, wherein each pressure-sensitive adhesive layer is optically clear.

10. The adhesive tape of claim 1, wherein the adhesive tape comprises the backing layer, a first pressure-sensitive adhesive layer adjacent to a first major surface of the backing layer, and a second pressure-sensitive adhesive layer adjacent to a second major surface of the backing layer.

11. The adhesive tape of claim 10, wherein the first pressure-sensitive adhesive layer is different than the second pressure-sensitive adhesive layer.

20. The adhesive tape of claim 1, wherein the backing layer is free or substantially free of an anti-blocking agent, a slip agent, or both.

21. The adhesive tape of claim 1, wherein the backing layer is formed by casting the poly(alkylene)copolymer between two smooth support layers.

22. The adhesive tape of claim 1, wherein the backing layer has a thickness that varies by less than 10 percent in any direction.

12. An article comprising:

a first substrate; and

an adhesive tape adhered to the first substrate, the adhesive tape comprising

(A) a backing layer comprising a poly(alkylene)copolymer comprising a polymerized product of a first polymerizable reaction mixture comprising

(1) a first alkene selected from ethene, propene, or a mixture thereof; and

(2) a second alkene selected from a 1,2-alkene having 4 to 8 carbon atoms; and

(3) a metallocene catalyst,

wherein the backing layer has a haze no greater than 5 percent and a luminous transmittance equal to at least 85 percent using ASTM D1003-07;

(B) a first pressure-sensitive adhesive layer that is adjacent to a first major surface of the backing layer, wherein the first pressure-sensitive adhesive layer comprises a silicone-based adhesive composition; and

(C) a tab that extends beyond the first substrate, wherein pulling the tab stretches the adhesive tape and releases the adhesive tape from the first substrate, wherein the adhesive tape is stretchable at least 50 percent in a first direction without breaking when the tab is pulled.

13. The article of claim 12, wherein the first pressure-sensitive adhesive layer is optically clear.

14. The article of claim 12, wherein the silicone-based adhesive composition comprises (a) 30 to 90 weight percent silicone material comprising at least one silicone elastomer, silicone gum, or a mixture thereof and (b) 10 to 70 weight percent silicone tackifying resin.

15. An article comprising:

a first substrate;

a second substrate; and

an adhesive tape positioned between the first substrate and the second substrate, wherein the adhesive tape couples the first substrate to the second substrate, the adhesive tape comprising

(A) a backing layer comprising a poly(alkylene)copolymer comprising a polymerized product of a first polymerizable reaction mixture comprising

(1) a first alkene selected from ethene, propene, or a mixture thereof; and

(2) a second alkene selected from a 1,2-alkene having 4 to 8 carbon atoms; and

(3) a metallocene catalyst,

wherein the backing layer has a haze no greater than 5 percent and a luminous transmittance equal to at least 85 percent using ASTM D1003-07;

(B) a first pressure-sensitive adhesive layer that is adjacent to a first major surface of the backing layer and a second pressure-sensitive adhesive layer that is adjacent to a second major surface of the backing layer, wherein the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer each comprise a silicone-based adhesive composition; and

(C) a tab that extends beyond at least one of the first substrate and the second substrate, wherein pulling the tab stretches the adhesive tape and releases the adhesive tape from the first substrate, from the second substrate, or from both the first substrate and the second substrate, wherein the adhesive tape is stretchable at least 50 percent in a first direction without breaking when the tab is pulled.

16. The article of claim 15, wherein the adhesive tape is optically clear and at least one of the first substrate or the second substrate is selected from a display, polarizer, touch panel, lens, reflector, diffraction grating, mirror, projection prism, or multilayer optical film.

17. The article of claim 15, wherein the silicone-based adhesive composition comprises (a) 30 to 90 weight percent silicone material comprising at least one silicone elastomer, silicone gum, or a mixture thereof and (b) 10 to 70 weight percent silicone tackifying resin.

18. A method of coupling and decoupling two substrates, the method comprising:

providing a first and second substrate;

positioning an adhesive tape between the first substrate and the second substrate, wherein the adhesive tape couples the first substrate to the second substrate, the adhesive tape comprising

(A) a backing layer comprising a poly(alkylene)copolymer comprising a polymerized product of a first polymerizable reaction mixture comprising

(1) a first alkene selected from ethene, propene, or a mixture thereof; and

(2) a second alkene selected from a 1,2-alkene having 4 to 8 carbon atoms; and

(3) a metallocene catalyst,

wherein the backing layer has a haze no greater than 5 percent and a luminous transmittance equal to at least 85 percent based on ASTM D1003-07;

(B) a first pressure-sensitive adhesive layer that is adjacent to a first major surface of the backing layer and a second pressure-sensitive adhesive layer that is adjacent to a second major surface of the backing layer, wherein the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer each comprise a silicone-based adhesive composition; and

(C) a tab that extends beyond at least one of the first substrate and the second substrate; and

pulling on the tab of the adhesive tape to stretch the adhesive tape to release the adhesive tape from the first substrate, from the second substrate or from both the first substrate and the second substrate, wherein the adhesive tape is stretchable at least 50 percent in a first direction without breaking.

19. A method of making an adhesive tape, the method comprising:

providing a poly(alkylene)copolymer that is the polymerized product of a first polymerizable mixture comprising

(1) a first alkene selected from ethene, propene, or a mixture thereof; and

(2) a second alkene selected from 1,2-alkene having 4 to 8 carbon atoms. and

(3) a metallocene catalyst; and

casting a backing layer comprising the poly(alkylene)copolymer between a first support layer and a second support layer, wherein the backing layer has a haze no greater than 5 percent and a luminous transmittance that is at least 85 percent based on ASTM D1003-07; and

positioning at least one pressure-sensitive adhesive layer adjacent to a first major surface of the backing layer, wherein the at least one pressure-sensitive adhesive layer comprises a silicone-based adhesive composition.