Patent Application
20060089585
The present invention relates to an adhesive plaster for treating chaps. More specifically, it relates to an adhesive plaster which has a configuration particularly suitable for treating chaps formed around the nail of fingertip, and is capable of quickly treating chaps by closing cracks.
In the foregoing, first-aid adhesive plasters have been used to treat chaps formed at fingertip by kitchen work, etc. in winter season. However, the first-aid adhesive plaster is used for treatment by putting a pad portion positioned at the center of a rectangular backing onto cracks and protecting and also drying the cracks. Thus, there is a problem that exudation such as blood from the cracks is fixed to the pad after drying, and scabs formed at the cracks are pulled and give pain when the adhesive plaster is peeled. Further, closeness will be insufficient at the portion of a small curved configuration like fingertip, and when water penetrates therein by kitchen work, the pad portion will get wet and the treatment will be delayed.
For the closure of the cracks, as a means for improvement, U.S. Pat. No. 6,410,818 discloses a technique for promoting healing by closing the cracks with an adhesive material. However, the material used for the closure of the cracks described in this publication is of a rectangular shape as well, and this shape is not suitable for enclosing the fingertip in a closed state, and is not suitable for protecting the wound portion around the nail of fingertip. Further, WO 99/16396 discloses an adhesive plaster of a shape suitable for fingertip. The adhesive plaster described in this publication has no pad, and has a shape suitable for enclosing the fingertip, like a boomerang. However, this shape cannot cover the fingertip entirely, and is not suitable for closing the chaps formed at side faces of nail (interface with skin).
As described above, the conventional adhesive plaster has problems such that since even a small-size adhesive plaster for fingertip has a pad, it does not fit to a special affected part such as chaps, excess part of a substrate remains at the fingertip and the sticking is not comfortable, and the appearance is bad. In the present invention, in order to solve these problems, no pad is provided and fitting can be improved by use of a substrate having stretchability.
Namely, it is an object of the present invention to provide an adhesive plaster for treatment of chaps and a treatment method thereof, by which even chaps formed around the nail of fingertip can be treated by closing the cracks securely.
The present inventors have found that the above problems can be solved by using an adhesive plaster which is made of a laminate of a stretchable backing and an adhesive and has a substantially T-shape. By forming the adhesive plaster in a substantially T-shape, it fits to the fingertip, and chaps easily formed around the nail of fingertip can be enclosed and protected. Further, when the backing is formed to have stretchability and the adhesive plaster is attached while slightly stretching it, it is possible to entirely close the chaps formed at the front part and right and left parts of the nail, and the adhesive plaster does not easily slip through the fingertip.
As mentioned above, by using the adhesive plaster of the present invention, it is possible to protect the opening of wound, and close it, and treat the chaps in an early stage.
The adhesive plaster for treatment of chaps of the present invention comprises a backing 10 having stretchability. As such a stretchable backing, a non-woven fabric made of elastic fibers is preferably used.
As the non-woven fabric made of elastic fibers, non-woven fabrics of polyurethane elastic fibers, polyacryl elastic fibers and other elastic fibers may be used. As the non-woven fabric made of elastic fibers, ones having the following properties are preferably used.
Basic weight 20 to 200 g/m2
Thickness 0.14 to 0.54 mm
10% tensile stress (both longitudinal and transverse directions) 1.0 to 2.2 N/25 mm
100% tensile stress (both longitudinal and transverse directions) 1.6 to 11.8 N/25 mm
100% tensile recovery ratio (both longitudinal and transverse directions) 90%
The basic weight is further preferably about 30 to 150 g/m2.
Such non-woven fabric made of elastic fibers is produced by, for example, laminating polyurethane elastic filaments wherein the contact points of the filaments are as if bonded by said filaments by themselves, and may be produced by various methods such as a span bond method, a melt blow method and a flash spinning method. Among them, a non-woven fabric made of elastic fibers produced by a melt blow method is preferred. As the melt blow production method for the non-woven fabric made of polyurethane elastic fibers, for example, a method is proposed wherein a polyisocyanate compound is added to a molten thermoplastic polyurethane elastic material, and it is kneaded, and then spun from orifices and the formed filaments are sprayed along high speed flow and deposited in a sheet-like form on a net conveyor and collected (JP-B-64-8746). In this method, a net conveyor (seamless belt) is moved in the flow direction of the produced non-woven fabric. And, the web collected on the net conveyor is pressed by a roller as the case demands, and wound as a non-woven fabric.
As the fibers of the non-woven fabric, ultrafine filaments having an average fiber diameter of about 7 to 15 μm are preferred. For production of a polyurethane non-woven fabric made of such ultrafine filaments, for example, a method wherein a melt blow method is improved and the diameter of the pore of nozzle is made extremely small, may be mentioned. As commercially available ones for the non-woven fabric made of such ultrafine filaments, Tapyrus (trade name, manufactured by Tonen Tapyrus Co., Ltd.), Espansione (trade name, manufactured by Kanebo Corporation) and the like may be mentioned.
When the fiber diameter of the filaments constituting the non-woven fabric as the backing is made small, an adhesive plaster having a fine texture of the surface and small unevenness in thickness, can be obtained. This non-woven fabric is, of course, excellent in air permeability and stretchability.
If the fiber diameter of the non-woven fabric becomes small, the cooling speed of the fiber becomes high, whereby the fusion by heat at the contact points of respective fibers (filaments) may sometimes be insufficient. In such a case, the internal strength of the non-woven fabric can be enhanced by embossing. As the embossing method, point application method of heat contact bonding method is preferably employed. By such embossing, at least 10 fusion points by heat are formed per 1 cm2 so as to make up the insufficiency of internal strength. In addition, by the embossing, slipping properties or the surface of the adhesive plaster (opposite face of an adhesive layer described below) agrees with slipping properties of skin, uncomfortable feeling when an object is grasped by fingers covered with the adhesive plaster will be reduced.
On one face of the backing 10, an adhesive layer 11 is formed (see
It is further preferred to use an adhesive having a moisture permeability and an air permeability. Further, when the adhesive has no moisture permeability and air permeability, this adhesive may be coated in a frame-like form with a constant width on a peripheral portion of the backing, and partially applied inside the frame with a dot-like pattern, a stripe-like pattern or the like.
The upper face of the adhesive layer 11 is desirably covered by a release liner 12. As the release liner 12, ones obtained by applying a treatment with a release agent such as a silicone resin on paper, a polyester film, a polyolefin film or the like.
A raw fabric of an adhesive plaster obtained by laminating a backing/an adhesive layer/a release liner by a conventional method, is punched out in a desired shape with a punching blade, etc., to prepare the adhesive plaster of the present invention.
The backing 10 of the adhesive plaster of the present invention has a configuration of a substantially T-shape, by which this can be easily attached to fingertip. Of the backing 10 shown in
When such an adhesive plaster of the present invention is used, in general, the release liner 12 is peeled, the protruding portion 15 is firstly attached as shown in
Similar effects can be obtained when as shown in
The adhesive plaster can be conveniently used when it has a slit 27 in the release liner 12 as shown in
The adhesive plaster of the present invention has excellent fitting properties and gives less uncomfortable feeling, and the tension by winding is neither tight nor loose and gives appropriate feelings. Further, unlike conventional ones, even if the temperature rises or repeating stretch is applied, it adapts to such change sufficiently and does not slip from the finger. Moreover, peeling from the end portion of the attached adhesive plaster can be suppressed. And, air permeability and moisture permeability are excellent, and unpleasant feeling due to heat and humidity and propagation of various bacteria can be suppressed.
