Disposable absorbent article with side cuffs comprising an adhes

Details Disposable absorbent article with side cuffs comprising an adhes Disposable absorbent article with side cuffs comprising an adhes

1999-06-23

2000-12-05

Jagannathan, Vasu

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524505, 604389, A61F 1315, C08L 5302

Patent

active

06156818&

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to disposable absorbent articles particularly sanitary napkins, pantiliners, adult incontinence products or baby diapers which have side cuffs. In particular the present invention relates to such disposable absorbent articles with side cuffs which are maintained in their in use position by direct attachment to the skin of the wearer. The topical adhesive attachment of the side cuffs needs to be secure and pleasing upon application and during use of such articles, yet cause no discomfort upon removal of the article. This is achieved by the present invention selecting the rheological characteristics of adhesives for side cuffs of such articles.


BACKGROUND OF THE INVENTION

The general prior art in the field of disposable absorbent articles for topical application to the skin of a wearer is particularly developed in the field of band-aids, plasters and bandages. These articles are, however, typically applied in an emergency situation where for example a cut into the skin of the wearer has occurred and absorption of the body liquids emanating from a wound is desired. In this context performance aspects of the absorbent article such as comfortable and easy use and application, painless removal, discreteness are subordinate to criteria such as sterility, healing support, mechanical protection of the wound.
Also such wound covering absorbent articles are mostly used in skin areas where prior to application of the absorbent article body hair can be removed or where little or no hair grows.
The present invention does not relate to wound covering absorbent articles but relates to absorbent articles for absorption of body liquids which naturally emanate from a body without a wound. For example sanitary napkins or pantiliners for use in the genital region are such articles. Also incontinence devices which are worn e.g. in the genital region are the subject of the present invention.
The cuffs of such articles are applied to the skin of a wearer in a region were typically a considerable amount of hair grows such that the criteria of easy and painless removal of the article is of key importance. Articles for direct attachment to the skin have generally been disclosed in US statutory invention registration H1602 or WO 96/33683. Some more details of such articles have been considered for example in PCT application WO 95/16424. In this document sanitary articles having a body adhesive which is applied on the wearer facing side of a sanitary napkin along the entire periphery are disclosed. The problem underlying this document is primarily the safe attachment to the skin but mentions also the problems of detachment of such articles after use without causing undue pain to a wearer.
The disclosure of WO 95/16424 includes a detailed analysis of the criteria for the body adhesive in respect to rheological criteria. However, this document has little regard to the problem of painless removal of such articles since the rheological criteria taught include epilatory, i.e. hair removal, compositions which are commercially available such as STREP MIELE (TM) sold in Italy by Laboratori Vaj S.p.A. The adhesives for topical attachment mentioned in WO 95/16424 include also today's pressure sensitive adhesives which are used to attach sanitary napkins to undergarments. Further, this document only identifies static rheological characteristics but is silent as to the dynamic rheological behaviour of a body adhesive.
In WO 96/13238 a frequency dependent body adhesive model is disclosed. However, all measurements disclosed, e.g. on page 9, were made at temperatures between -60.degree. C. and +120.degree. C. and at actual frequencies of 0.1 to 100 rad/s. In order to obtain the necessary data at application temperature (about 20.degree. C., typical bath room, i.e. storage temperature) the Williams-Landel-Ferry (hereinafter WLF) equation was used.
This WLF equation is empirical and only valid within certain limits e.g. it cannot be used to extrapolate to temperatures below the glass transition

REFERENCES:
patent: 4687478 (1987-08-01), Van Tilburg
patent: 5559165 (1996-09-01), Paul

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