Switchable adhesive article for attachment to skin and method of using the same
A hypoallergenic adhesive article employing a switchable pressure sensitive adhesive (PSA) composition comprising one or more amphiphilic polyesters in physical mixture with a humectant. When contacted with a liquid of low-ion content, the adhesive undergoes a reduction in peel strength, which allows for easy removal, but remains strongly adhered when contacted with ionic liquids, such as blood, sweat, and other bodily fluids. The adhesive composition can be employed in a variety of medical articles or in other similar applications.
1. A switchable adhesive article suitable for attachment to the skin, said article comprising: a porous backing and a pressure sensitive adhesive (PSA) applied to said porous backing, wherein said PSA comprises at least one water-dispersible amphiphilic polyester and a humectant in physical mixture with said polyester; and wherein said PSA is sufficiently switchable such that when a low-ion liquid is applied to said porous backing said liquid travels through said porous backing and into contact with said PSA to thereby reduce the average wet skin peel strength of said PSA to less than 50 percent of the average dry skin peel strength of said PSA.
2. The article according to claim 1 wherein said PSA has a pH in the range of from about 6.5 to about 8.25.
3. The article according to claim 1 wherein said PSA comprises greater than about 90 weight percent of said amphiphilic water-dispersible polyesters.
4. The article according to claim 1 wherein said PSA comprises in the range of from about 0.5 to about 10 weight percent said humectant.
5. The article according to claim 1 wherein said PSA comprises greater than 95 weight percent of said amphiphilic water-dispersible polyesters.
6. The article according to claim 1 wherein said PSA comprises in the range of from 1 to 4 weight percent of said humectant.
7. The article according to claim 1 wherein said amphiphilic water-dispersible polyester is a water-dispersible sulfonated polyester.
8. The article according to claim 1 wherein said cold flow reducing agent has a molecular weight less than about 750 grams per mole.
9. The article according to claim 7 wherein said PSA consists essentially of a blend of at least one linear water-dispersible sulfonated polyester and at least one branched water-dispersible sulfonated polyester and a humectant in physical mixture with said polyesters.
10. The article according to claim 1 wherein said article is a wound dressing, a surgical dressing, a medical tape, an athletic tape, a tab or tape used to adhere medical devices, or an adhesive device for transdermal drug delivery.
11. A method of attaching and removing a switchable adhesive article to and from skin, said method comprising:
adhering a switchable adhesive article to skin, wherein said adhesive article comprises a backing and a pressure sensitive adhesive (PSA) applied to a first side of said backing, wherein said PSA comprises at least one sulfonated water-dispersible polyester;
applying low-ion liquid to said PSA; and
subsequent to step (b), removing said article from said skin, wherein the average skin peel strength of said PSA subsequent to step (b) is less than about 75 percent of the average skin peel strength of said PSA prior to step (b).
12. The method according to claim 11 wherein said PSA has a pH in the range of from about 6.5 to about 8.25.
13. The method according to claim 11 wherein said backing is sufficiently porous to allow water applied to a second side of said backing to travel through said backing and into contact with said PSA on said first side of said backing.
14. The method according to claim 11 wherein said backing is sufficiently porous to allow water applied to said second side of said backing to travel through said backing and into contact with at least about 10 percent of the area of said PSA applied to said first side of said backing.
15. The method according to claim 11 wherein said low-ion liquid is polar.
16. The method according to claim 11 wherein said low-ion liquid comprises less than about 5 grams per liter ions.
17. The method according to claim 11 wherein said low-ion liquid comprises water.