Self-adhering absorbent article

Details Self-adhering absorbent article Self-adhering absorbent article

1996-06-07

2001-04-10

Weiss, John G. (Department: 3761)

Surgery

Means and methods for collecting body fluids or waste material

Absorbent pad for external or internal application and...

C604S387000, C604S389000, C604S390000

Reexamination Certificate

active

06213993

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a disposable absorbent article having an adhesive disposed adjacent to a wearer's skin. More particularly, the invention relates to a catamenial device having a supportive adhesive residing on the bodyside surface of the device.
BACKGROUND OF THE INVENTION
All manner and variety of externally positioned disposable absorbent articles configured for the absorption of body fluids such as menses, urine, feces and the like are well known. For simplicity of describing the invention, such articles will be collectively referred to herein as a sanitary napkin. Those skilled in the art understand the differences in these structures and will readily appreciate the adaptability of this invention to these other structures.
Securement of the sanitary napkin during use is often accomplished by attaching the sanitary napkin to the wearer's undergarment by a pressure sensitive adhesive. Securing a sanitary napkin to an undergarment can exhibit a number of drawbacks. One drawback is that the adhesive can stick too aggressively to the inside surface of the undergarment leaving residue. Another disadvantage is the napkin will tend to move with the undergarment rather than associating with the bodily movements of the wearer. This can result in a less secure fit and increase the incidence of fluid leakage, irritation, chafing and discomfort.
In the past, attempts have been made to adhere a sanitary napkin to the wearer. However, the sanitary napkins have been large enough so as to avoid the adhesive being placed in contact with the wearer's pubic hair and sensitive genitalia. This is because in securing the sanitary napkin to the wearer, the prior art teaches using adhesives of the type used in various surgical applications. Removal of these adhesives typically causes sudden pain and discomfort to the wearer. Thus, avoiding such sensitive areas has been desirable.
It would therefore be desirable to have a sanitary napkin that can be secured to the wearer's body that would be comfortable to wear, would be discrete, give the wearer a feeling of security during use and would not cause discomfort upon removal.
SUMMARY OF THE INVENTION
Briefly, this invention relates to an absorbent article having an absorbent core with at least one surface designed to be positioned adjacent to a wearer's body, i.e., having a bodyfacing surface, and a pressure sensitive adhesive secured to the bodyfacing surface. Preferably the adhesive is a hot melt adhesive. Adhesives in accordance with the present invention have a rheological property, tan delta (&dgr;) referenced to 20° C., ranging from about 0.01 to about 0.6 and preferably from about 0.06 to about 0.48 at a frequency of 0.1 radians per second and a tan &dgr; ranging from about 0.10 to about 1.7 and preferably from about 0.20 to about 1.5 at a frequency of 1000 radians per second. In a preferred embodiment of the invention the absorbent article includes a cover wherein the adhesive is secured to the bodyfacing surface of the cover.
The general object of this invention is to provide an absorbent article that is adhesively attached to the wearer's body. A more specific object of this invention is to provide a sanitary napkin that uses one or more adhesives having specific rheological properties to secure the sanitary napkin to the wearer.
Another object of the invention is to provide a sanitary napkin that is comfortable to wear and can be readily removed with little or no pain or discomfort to the wearer.


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