STRETCH RELEASING OPTICALLY CLEAR PRESSURE SENSITIVE ADHESIVE

• US 20110020640A1
• Filed: 01/05/2009
• Published: 01/27/2011
• Est. Priority Date: 01/11/2008
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Tapio, Scott M., Winkler, Wendi J., Sherman, Audrey A.
• Granted Patent: US 9,228,117 B2
• Time in Patent Office: Days
• US Class Current: 428/343
• CPC Class Codes: C09J 183/04 Polysiloxanes
• CPC Class Codes: C09J 2301/302 the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
• 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 2483/00 Presence of polysiloxane
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: C09J 7/40 characterised by release liners
• CPC Class Codes: C09J 7/403 characterised by the structure of the release feature
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer

Abstract

Optically clear stretch releasing pressure sensitive adhesive films containing a silicone pressure sensitive adhesive composition and a tacky tab are provided. The pressure sensitive adhesive compositions are formed from elastomeric silicone polymer selected from the group consisting of urea-based silicone copolymers, oxamide-based silicone copolymers, amide-based silicone copolymers, urethane-based silicone copolymers, polydiorganosiloxane polymers, or mixtures of these copolymers. The pressure sensitive adhesive compositions may also contain an MQ tackifying resin. The pressure sensitive adhesive compositions may be used to form adhesive articles.

Claims

3. The adhesive film of claim 1, wherein the pressure sensitive adhesive composition comprises:

an elastomeric silicone polymer; and

from about 10% by weight to about 70% by weight MQ resin.

5-1. The adhesive film of claim 1 wherein the pressure sensitive adhesive is extensible.

6. The adhesive film of claim 5 further comprising additional extensible layers.

19. The adhesive film of claim 6 wherein at least one of the additional extensible layers comprises a pressure sensitive adhesive or an elastomer layer.

8-2. The adhesive film of claim 1, wherein when a first substrate is bonded to a second substrate through the stretch releasing pressure sensitive adhesive tape, the stretch releasing pressure sensitive adhesive tape is capable of completely separating from one of the first substrate or the second substrate prior to completely separating from the other of the first substrate or the second substrate.

9-3. A method for removably bonding an assembly comprising:

providing a first substrate;

disposing a stretch releasing adhesive film on at least a portion of the surface of the substrate, wherein the stretch releasing pressure sensitive adhesive film comprises;

a silicone pressure sensitive adhesive composition;

and a tacky tab; and

contacting a second substrate with the stretch releasing pressure sensitive adhesive such that the second substrate is bonded to first substrate through the stretch releasing pressure sensitive adhesive and the tacky tab is available for grasping by a user.

10-4. The method of claim 9 wherein disposing a stretch releasing pressure sensitive adhesive film on at least a portion of the surface of the substrate comprises coating of the adhesive composition onto the substrate.

13-5. The method of claim 12 wherein grasping the tacky tab further comprises adhering a collection tool to the tacky tab.

14. (canceled)

4. The adhesive film of claim 1 wherein the pressure sensitive adhesive composition comprises a single layer.

5. (canceled)

8. (canceled)

9. (canceled)

10. (canceled)

7. The adhesive film of claim 2 wherein the elastomeric silicone polymer comprises an amide-based silicone copolymer comprising at least two repeat units of the formula:

13. (canceled)

15. (canceled)

16. (canceled)

17. (canceled)

11. The method of claim 9 wherein disposing a stretch releasing pressure sensitive adhesive film on at least a portion of the surface of the substrate comprises laminating of an adhesive article onto the substrate, wherein the adhesive article comprises a release liner with the stretch releasing adhesive film composition coated onto it.

21. (canceled)

12. The method of claim 9 further comprising stretch releasing the pressure sensitive adhesive film from the first and/or second substrates by grasping the tacky tab and stretching.

18. The assembly of claim 14, wherein one of the first substrate or the second substrate comprises a removable overlap segment which overlays the tacky tab.

20. The method of claim 9 wherein the stretch releasing pressure sensitive adhesive film further comprises additional extensible layers wherein at least one of the additional extensible layers comprises a pressure sensitive adhesive or an elastomer.

14-6. An assembly comprising:

a first substrate;

a second substrate; and

a stretch releasing pressure sensitive adhesive disposed between the first substrate and the second substrate wherein the stretch releasing pressure sensitive adhesive comprises;

a silicone pressure sensitive adhesive composition; and

a tacky tab.

15-7. The assembly of claim 14, wherein each of the first substrate and the second substrate comprises a rigid surface, a tape backing, a film, a sheet, or a release liner.

16-8. The assembly of claim 15 wherein the first substrate comprises a rigid substrate selected from glass, ceramic, porcelain, polymer, metal, or wood.

17-9. The assembly of claim 15 wherein the second substrate comprises glass, ceramic polymeric, metal, wood, a polymeric film, an optical film, or a release liner.

21-10. The assembly of claim 14 wherein the stretch releasing pressure sensitive adhesive further comprises an additional pressure sensitive adhesive or an elastomer.

22. (canceled)

23. (canceled)

26. (canceled)

33. (canceled)