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1. (WO2018125699) TAPES AND METHODS OF USE FOR MASKING ALUMINUM SURFACES IN CHROMIC ACID ANODIZATION
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What is claimed is:

1. A tape comprising:

a flexible backing layer having two major surfaces, wherein the backing layer has a thickness of greater than 64 micrometers and up to 200 micrometers, and one major surface of the backing layer comprise a primed surface; and

a rubber-based pressure sensitive adhesive layer disposed on the primed surface of the backing layer, wherein the pressure sensitive adhesive layer has a thickness of 7.6 micrometers to 25 micrometers;

wherein, when disposed on an aluminum substrate, the tape displays a peel adhesion strength of less than 50oz/in (547 N/m) according to a Peel Adhesion Strength Test, and a leakage distance of less than 762 micrometers according to a Chromic Acid Anodization - Leakage Distance Test.

2. The tape of claim 1 wherein, when disposed on an aluminum substrate, the tape displays a peel adhesion strength of less than 30 oz/in (328 N/m).

3. The tape of claim 1 wherein, when disposed on an aluminum substrate, the tape displays a peel adhesion strength of less than 20 oz/in (219 N/m).

4. The tape of claim 1 wherein, when disposed on an aluminum substrate, the tape displays a peel adhesion strength of less than 10 oz/in (110 N/m) according to the Peel Adhesion Strength Test.

5. The tape of claim 1 through 4 wherein, when disposed on an aluminum substrate, the tape displays a leakage distance of less than 635 micrometers according to the

Chromic Acid Anodization - Leakage Distance Test.

6. The tape of any one of claims 1 through 5 wherein the backing has a thickness of at least 75 micrometers.

7. The tape of any one of claims 1 through 6 wherein the pressure sensitive adhesive layer has a thickness of at least 10 micrometers.

8. The tape of any one of claims 1 through 7 wherein the pressure sensitive adhesive layer has a thickness of up to 15 micrometers.

9. The tape of any of claims 1 through 8 wherein the backing comprises a material selected from polyesters (such as polyethylene terephthalate and polyethylene

naphthalate), polystyrene, polyolefins (such as polyethylene, polypropylene, including, e.g., monoaxially oriented polypropylene and biaxially oriented polypropylene), polytetrafluoroethylene, polyvinylfluoroethylene, polyurethane, polyimide, polyamide, polyetheretherketone, liquid-crystal polyarylate, polyether sulfide, metal foils (such as aluminum, lead, and stainless steel), polyphenylene sulfide, polycarbonate, polyvinyl chloride, and combinations thereof (e.g., mixtures, copolymers, as well as composite supports having a plurality of layers of the foregoing materials laminated).

10. The tape of any one of claims 1 through 9 wherein the rubber-based pressure sensitive adhesive comprises a silicone pressure sensitive adhesive.

11. The tape of claim 10 wherein the silicone pressure sensitive adhesive comprises a silicone gum and an M-Q resin.

12. The tape of claim 11 wherein the silicone gum comprises a polydiorganosiloxane.

13. The tape of any one of claims 10 through 12 wherein the silicone pressure sensitive adhesive comprises a silicone oil.

14. The tape of claim 13 wherein the silicone oil comprises a polydiorganosiloxane fluid.

15. The tape of claim 13 or 14 wherein the rubber-based pressure sensitive adhesive comprises greater than 3 wt-%, and up to 25 wt-% silicone oil, based on the total weight of the pressure sensitive adhesive.

16. The tape of any one of claims 1 through 9 wherein the rubber-based pressure sensitive adhesive comprises a natural rubber pressure sensitive adhesive.

17. The tape of any one of claims 1 through 9 wherein the rubber-based pressure sensitive adhesive comprises a synthetic rubber pressure sensitive adhesive.

18. The tape of any one of claims 1 through 9 wherein the rubber-based pressure sensitive adhesive is a polyisobutylene rubber pressure sensitive adhesive.

19. The tape of any one of claims 1 through 16 wherein the primed surface of the backing comprises a treated surface or a chemical coating layer, or both.

20. The tape of claim 17 wherein the primed surface comprises a chemical coating layer.

21. A method of anodizing an aluminum surface, the method comprising:

providing a substrate having an aluminum surface;

applying a tape of any one of claims 1 through 16 to mask the aluminum surface and form a masked substrate; and

exposing the masked substrate to an electrolyte solution comprising chromic acid under conditions effective to form aluminum oxide.

22. The method of claim 21 wherein prior to applying the tape, the method further comprises cleaning the aluminum surface prior to applying the tape.

23. The method of claim 22 wherein after cleaning and prior to applying the tape, the method further comprises applying a conversion coating on the aluminum surface.

24. A method of anodizing an aluminum surface, the method comprising:

providing a substrate having an aluminum surface;

applying a tape of any one of the preceding claims to mask the aluminum surface and form a masked substrate; and

exposing the masked substrate to an electrolyte solution comprising chromic acid under conditions effective to form aluminum oxide;

wherein the tape comprises:

a flexible backing layer having two major surfaces, wherein the backing layer has a thickness of greater than 64 micrometers and up to 200 micrometers, and one major surface of the backing layer comprises a primed surface; and

a rubber-based pressure sensitive adhesive layer disposed on the primed surface of the backing layer, wherein the pressure sensitive adhesive layer has a thickness of at least 7.6 micrometers;

wherein, when disposed on an aluminum substrate, the tape displays a peel adhesion of less than 50 oz/in (547 N/m) according to a Peel Adhesion Strength Test, and a leakage distance of less than 762 micrometers according to a Chromic Acid Anodization - Leakage Distance Test.