Disposable diaper with a repositionable tape tab fastener

DETAILED DESCRIPTION According to the present invention, a disposable diaper is provided which has a pressure-sensitive adhesive closure, a moisture-permeable facing sheet, and a polyethylene or modified polyethylene moisture-impermeable backing sheet.
The pressure-sensitive adhesive closure has a pressure-sensitive adhesive comprising a major proportion by weight of the total elastomers of an elastomeric and thermoplastic block polymer of the structure A-B-A, wherein A is a thermoplastic polymer block of a vinyl arene and possesses a glass transition temperature above normal room temperature and B is an elastomeric polymer block of isoprene, the thermoplastic A blocks composing about 8-35 percent by weight of the block polymer and about 25-125 parts by weight per 100 parts by weight of the total elastomers of a solid tackifier selected from the group consisting of rosin, rosin derivatives, polyterpenes, hydrocarbon resins, or mixtures thereof and preferably, from about 2 to about 25 parts by weight of lecithin per 100 parts by weight of the total elastomers.
This adhesive composition provides a pressure-sensitive adhesive closure that may be reopened easily numerous times by separating the adhesive closure from the polyethylene backing sheet without substantial damage to the polyethylene backing sheet or to the adhesive closure.
The conventional adhesive tape tab fastener used on a disposable diaper, whether that diaper be appropriate for an adult or an infant, generally consists of a substrate which is coated on one side with adhesive.
One end of the substrate or tape segment is coated with an adhesive which appropriately affixes the tape tab permanently to the outside surface of the diaper.
Thus this end is identified as the fixed end.
The other end of the adhesive tape segment is a free end.
It is this free end which secures the diaper about the wearer when it is adhered to the outside diaper surface in an appropriate position.
When the adhesive tape tab fastener is in a storage position, the adhesive coated surface is in contact with a release means