Surgery: splint – brace – or bandage – Bandage structure
Reexamination Certificate
1999-06-10
2001-03-06
Brown, Michael A. (Department: 3764)
Surgery: splint, brace, or bandage
Bandage structure
C602S044000, C602S047000, C602S049000, C602S050000, C602S054000
Reexamination Certificate
active
06198016
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to pressure-sensitive adhesive products for use in adhering to skin or like delicate surfaces.
Pressure-sensitive adhesive tapes and the like are used in a wide variety of applications where there is a need to adhere to skin, for example, medical tapes, wound or surgical dressings, athletic tapes, surgical drapes, or tapes or tabs used in adhering medical devices such as sensors, electrodes, ostomy appliances, or the like. A concern with all these adhesive-coated products is the need to balance the objective of providing sufficiently high levels of adhesion to wet skin as well as to dry skin.
One approach in the art to providing pressure-sensitive tapes for application to wet skin has been the use of pattern coated adhesives. A discontinuous adhesive coating on a backing allows the skin to breathe, at least in the areas of the backing not coated with adhesive. This approach is disclosed in U.S. Pat. Nos. 4,595,001 and 5,613,942, as well as EP 353972 and EP 91800. These patent documents generally teach intermittent coating of adhesives onto different backings. For example, U.S. Pat. No. 5,613,942 describes printing pressure-sensitive adhesives using a release coated calender roll process similar to gravure printing. This patent also teaches screen printing. However, pattern coating or printing of adhesives in this manner is problematic as it generally requires solvents, which are environmentally undesirable. Further, residual low molecular weight species can cause skin irritation. It would be preferred from environmental, manufacturing (e.g., elimination of the need for expensive solvent recovery), and performance perspectives to have adhesives coatable directly from a melt phase.
Articles having good wet skin adhesion are described in U.S. Pat. No. 5,613,942. These articles include a porous backing made of non-wettable fibers and a discontinuously coated adhesive. The backing absorbs less than 4% by weight water, thereby allowing water on wet skin to pass through the entire article. Although this provides suitable wet skin adhesion in some applications, there is still a need for articles having good initial wet skin adhesion in other applications, preferably, on the order of the same article's initial dry skin adhesion.
SUMMARY OF THE INVENTION
The present invention provides an adhesive-coated substrate (i.e., an article) comprising a backing substrate and a discontinuous adhesive layer coated (i.e., disposed) thereon, wherein the backing substrate comprises a fibrous web and absorbent particulate material, and further wherein the adhesive-coated substrate has an initial wet skin adhesion of at least about 20 g/2.5 cm (0.08 N/cm). Preferably, the adhesive-coated substrate has an initial dry skin adhesion of at least about 20 g/2.5 cm (0.08 N/cm). More preferably, the initial wet skin adhesion is at least about 65% of the initial dry skin adhesion. Most preferably, the initial wet skin adhesion is about 65% to about 135% of the initial dry skin adhesion.
The adhesive-coated substrate (i.e., adhesive article) can be in the form of a wide variety of articles, such as medical tapes, wound or surgical dressings, athletic tapes, surgical drapes, or tapes or tabs used in adhering medical devices such as sensors, electrodes, ostomy appliances, or the like.
The present invention also provides a method of making an adhesive article. The method includes providing a backing substrate and applying a discontinuous adhesive layer to a major surface thereof, wherein the backing substrate comprises a fibrous web and absorbent particulate material, and further wherein the article has an initial wet skin adhesion of at least 20 g/2.5 cm (0.08 N/cm). The step of applying can occur by laminating the adhesive layer to the backing substrate, spray coating, screen printing, or the like. Thus, “adhesive-coated” as used herein includes, for example, a laminated layer of an adhesive on the backing substrate.
A method of using an adhesive article is also provided. The method includes providing an adhesive article comprising a backing substrate and a discontinuous adhesive layer disposed thereon, wherein the backing substrate comprises a fibrous web and absorbent particulate material, and further wherein the article has an initial wet skin adhesion of at least 20 g/2.5 cm (0.08 N/cm); and adhering the adhesive article to skin.
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Battles Donald R.
Lucast Donald H.
3M Innovative Properties Company
Bond William J.
Brown Michael A.
Griswold Gary L.
Hamilton Lalita M.
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