Stock material or miscellaneous articles – Layer or component removable to expose adhesive – Halogen containing compound
Patent
1994-05-05
1996-04-23
Ahmad, Nasser
Stock material or miscellaneous articles
Layer or component removable to expose adhesive
Halogen containing compound
428192, 428194, 428345, 428348, 428352, 428354, 428447, 428452, 428511, 604389, 604390, B32B 306
Patent
active
055101615
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to tape laminates and in particular to composite pre-laminated tapes for forming closures, e.g., for disposable diapers.
BACKGROUND AND FIELD OF THE INVENTION
At least as early as 1955, it had been suggested to use trips of normally tacky and pressure-sensitive adhesive tape to secure conventional cloth diapers on an infant, see for example U.S. Pat. Nos. 2,714,889 and 3,221,738. A few years later, when disposable diapers became extremely popular, strips of pressure-sensitive adhesive tape were again employed as closures, see for example U.S. Pat. No. 3,620,217.
A disposable diaper typically has a thin, flexible, low density polyethylene film cover, an absorbent filler within the cover, and a porous inner liner overlying the filler. The diaper is positioned at the crotch of an infant with the two ends of the diaper extending toward the front and back, respectively. Edges on each side of the diaper are then either positioned adjacent to each other or overlapped using a strip of pressure-sensitive adhesive tape being adhered to the cover film at border regions adjacent each of the two edges to hold the diaper closed.
After a tape closure has been opened, it is frequently discovered that the diaper has not been soiled and hence that there is no need to replace it. If the diaper cover has not been torn, a second strip of tape can sometimes be applied as a replacement closure, but this is often inconvenient. As a result, considerable work has been undertaken to develop a tape diaper closure that is not only capable of bonding firmly to the diaper cover but is also capable of being opened without destroying the tape diaper closure or the diaper cover and subsequently reclosed. Closures of this type have involved a combination of two or more tapes, one of which remains permanently adhered to one edge of the diaper and the other being removably adhered to the other edge of the diaper. Examples of such products are disclosed in U.S. Pat. Nos. 3,951,149, 3,987,793, 3,999,546, 4,020,842, 4,227,530, 4,726,971 and 4,801,480, and European Patent No. 0148587A.
Typically, tape closures for diapers are fabricated by positionably mounting a plurality of individual rolls of the appropriate tapes and combining then in situ to form a composite strip of tape, the width of which is substantially the same as the length of the diaper closure to be fabricated. The composite roll is then severed at right angles to the edges of the composite strip at intervals corresponding to the width of the desired tape closure and adhered at an appropriate location along the border adjacent the side edges of the diaper as exemplified in U.S. Pat. Nos. 3,616,114, 4,726,971 and 4,801,480, and European Patent no. 0148487A. Although this manufacturing process is effective, relatively sophisticated machinery is necessary to accomplish the superimposition of several rolls of tape to form a composite strip of tape in situ. Thus, it is desirable to provide diaper manufacturers with a composite pre-laminated tape in a single roll from which tape closures may readily be prepared.
A common feature of such tape closure systems is that the fastening or closure tape comprises a backing, such as paper, polymeric film etc., having an adhesive layer on one side and a coating of a suitable release agent on the other side to facilitate unwinding of the composite strip when wound upon itself about a core. Generally, the backing comprises paper which is coated with a barrier layer prior to application of the release agent in the form of a solution or water-based formulation. The barrier layer prevents the formulation of release agent being absorbed by the porous paper prior to drying thereby ensuring the release agent remains at the surface where it is most effective. Suitable materials for the barrier layer include polyethylene, typical release agents are based on silicone chemistry.
Solventless, radiation-curable release coating compositions are known and are disclosed, for example, in British patent No. 2010698. The compo
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Ahmad Nasser
Bond William J.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
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