FI58590B - PORLOEST TRYCKKAENSLIGT ADHESIVBAND - Google Patents

Description

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jdfJTa M MTUTLAeCNINeiSKRIFT 56590 C Patent granted lo 03 1931 (45) Patent meddelat ^ (51) Kv.ik? /tet.a.3 A 61 L 15/06 // A 61 F 13/02 FINLAND —FINLAND (21) Pw * ntt «» kemu · —PM «rtaM5knln | 783/71 (22) H * k * ml »cloud * - Anteknlnffdtg 18.03.71 (23) AlkupUvl ~ -GiM | h« t * d> | l8.03.71 (41) Tulhit JulklMlal —Bltvlt off «ntll | g -j_o 71

National Board of Patents and Registration / 44) Date of Nihttvikslpanon ji kuL | ulkai * in. - oS ..

Patani och registerstyrelsen Amök »n utitgd och uti. * Krifw« pubiicmd ^ 0.11. ou (32) (33) (31) Requested Death.priority 17 · 0U. 70 USA (US) 29566 (71) The Scholl MFG. C/o. Limited., 182-20U St. John Street, London E.C.l,

En gl an t i-En glan d (GB) (72) Roger Charles Raguse, Michigan City, Indiana, USA (7I) Oy Kolster Ah (5l) Non-porous pressure-sensitive adhesive tape - Porlöst tryckkänsligt adhesivband

The invention relates to fastening tapes, which term is also used hereinafter to refer to plates.

In the past, an adhesive tape has been developed with a radiant base applied to one surface in an acrylate adhesive. The adhesive is pressed at spaced points on the back and at these points the adhesive binds the adjacent yarns of the back together. Due to such bonding, it is assumed that the filament fabric bonded at such intervals is much easier to tear than fabric pads to which the adhesive is not bonded in this way. However, tearing occurs only in the transverse direction of the fastening tape, and even this usually results in rough edges on the tearing line and a long, hanging fiber at the end of the tearing line, and more force is required for tearing by hand in one direction than is desirable. This tape is known to become quite sticky and sticky during the summer and often leaves some adhesive mass on the patient's skin after the tape is removed, especially after the tape has been moistened.

In the past, cotton fabric has also been most often used as a backing for adhesive tape, especially in tape used in hospitals and doctor's surgeries. The cotton tape can only be torn using an undesirably large amount of force, and even then not as evenly as would be desirable. When a tape with cotton fabric tear is normally torn, this tends to cause the tape to curl and stretch at the point of tearing, making it very difficult for a physician or surgeon to place the tape on a patient's body. A tape with a cotton cloth backing must use a fairly large amount of adhesive because the fibers separate it while the tape is on a roll.

One known pressure-sensitive adhesive tape has a backing and an adhesive layer of precisely specified material. However, no liquid impermeability requirements have been set for this tape, nor is there any information on the number of warp and weft yarns. The same drawbacks that were presented with respect to the former known fastening tape therefore apply to the main parts of this tape as well.

a pressure sensitive kiinnenauha of the subject invention consists of a high thread-number counter-woven cellulosic tekokuituselustasta, wherein the warp yarns are parallel to each other and the weft threads parallel to each other and oriented perpendicular to the warp threads, wherein the kiinnenauha comprises backstabbing thrive on the other side aksyylipolymeeriä the bottom of the binder, which completely covers the backstabbing thrive surface and the pressure-sensitive of adhesive, containing both natural rubber and synthetic rubber. The invention is characterized in that the number of warp yarns of the backing is of the order of 70 warp yarns and 20 weft yarns per square centimeter, and the adhesive layer is applied directly on the base binder. easily and straightly tearable in both transverse and longitudinal directions, leaving clean and smooth uncracked edges along the tear line.

The tape can be easily torn by hand in molenxn directions, transversely or longitudinally, using less force than any other fabric-aged tape made before this. The edges caused by tearing are smooth and hairless and do not depend on unpleasant fibers to irritate the user. The tape also needs less pressure-sensitive adhesive than previously used tapes, especially because the tack does not decrease when the tape is wound into a roll. The tape can be easily removed from the patient's or user's skin and leaves essentially no adhesive on the skin after removal of the tape, even if the tape has been previously dipped. When using this tape in a hospital, doctor's office, etc., it is not necessary to store adhesive tapes of many different widths, because the tape can be easily torn lengthwise into strips of the desired width, and each strip thus removed from the storage tape piece has a uniform width along its entire length. The tape can also be just as easily torn transversely to obtain the desired length for a given use. For example, a 2.54 cm (1 ") wide strip can be easily torn lengthwise into two strips 1.27 cm (£") wide, or four strips 0.63 cm (1/4 ") wide.

More specifically, the tape consists of a woven man-made fibrous web, one side of which is covered with a base binder that evenly binds or joins the yarns of the web into a single continuous film that can be exceptionally easily torn in both directions directly, accurately, and evenly. The solid mass is calendered on the primed side of the backing, which has not been done satisfactorily so far, especially with the starch acetate backing. The solid mass can be used without the risk of cracking, even if the backing is dipped. In addition, the binder does not go to its back, but only touches the base binder directly. Therefore, the tape can be manufactured economically, as the adhesive is needed less than in known tapes where part of the adhesive goes or is forced on the back. It should also be noted that a primer can be applied to a primed man-made fiber substrate, such as sparkling acetate, by calendering without the need to apply a solvent.

The tape is odorless due to the base binder used and is so waterproof that water does not enter the adhesive through the primer or backing when one layer of tape passes over a previously attached layer of tape when making the bond.

To illustrate the invention, the following examples will be described by way of example with reference to the accompanying drawings, in which: Figure 1 is a fragmentary perspective view of a tape roll of the invention showing the tape partially unwound and partially torn in both directions to show tear smoothness; Fig. 2 shows a similar view according to Fig. 1, but showing what happens when a known adhesive tape is torn; Fig. 3 shows a much enlarged vertical sectional view of the strip of Fig. 1, showing this structure; and Fig. 4 shows a much enlarged bottom view, schematically showing an arrangement of yarns woven to make a fabric substrate for a strip.

Figure 1 shows a fastening tape roll 1 from which a tape 2 has been unwound. This tape can be easily torn in molar directions, with very little force on the user and only the thumb part of the hands and other bulls. To show the nature of the tearing, the tape is shown partially torn to separate a piece of adhesive tape of the desired length from the tape 2, as shown by the raised angle 3. It can be seen from the figure that the edge 4 remaining on the strip 2 is smooth and free of lashes and the same applies to the edge 5> of the detached part of the strip 2, both edges extending directly across the strip at right angles to the side edges of the strip 2. It can be seen from the figure that the tearing takes place evenly and easily, and the strip 2 or the piece 2a tearing from it does not stretch or curl at the tearing point, as would happen if a cotton fabric backing were used in the strip. The strip can easily be torn in its longitudinal direction, as indicated by the raised strip 6, so that a strip strip 6a is narrower than the strip 2. The user does not need to apply more force when tearing longitudinally than the above transverse tear, and it should be noted that both the narrow strip 6a side edge 7 and the 2 side edges of the remaining ribbon are flat and have no lashes or hanging threads. It should also be noted that the removable strip 6a has a uniform width over its entire length, regardless of whether the tearing is performed quickly or slowly. The tear line always stays straight, especially if the strip is torn straight from the roll and only the strip is unwound. Slower tearing is more advantageous if the unwound strip is torn longitudinally due to the tendency of the arm to move inward across the body as it is moved rapidly downward, thereby exerting a transverse force.

4,58590

In contrast to the tape of Figure 1, Figure 2 shows a known medical type adhesive tape. Figure 2 shows a roll of medical adhesive tape 9 »from which the tape 10 has been unwound. The tape 9 has a support film on which a pressure-sensitive adhesive has been applied directly against the support. Tearing the strip as shown by the transversely raised angle 11 requires considerable force and the edge 12 on the strip 10 and the edge 13 of the detachable body are both uneven and often depend on a few yarns or lashes 14. If the back of the strip 9 were woven from cotton pulp, the strip would not be torn satisfactorily because it requires a lot of force and would splatter many such fibrous lashes or hanging yarn portions and the side edges of the strip would curl and stretch at the tear point. If the backing had been made of man-made fibers and the ribbon had been printed on the back at spaced points, some small fibrous eyelashes would most often be struck in the middle of the torn edges and the end of the tear line likely hanging from a piece of yarn 13, even if such a ribbon . The raised strip 16 indicates that the results are the same if an attempt is made to tear the strip lengthwise, assuming that sufficient force is applied. If the strip 9 is torn longitudinally, then the tear line deviates most often from the straight line as indicated by the broken lines 17 and 18 and it is substantially impossible to tear the strip in a straight line, regardless of its support, even a quarter of the time. Thus, it has not been possible to tear the known medical tape longitudinally so that it is suitable for use in hospitals and doctor's surgeries.

Figures 3 and 4 show enlarged and somewhat schematic views of the structure of the fastening tape of Figure 1. The ribbon is woven from a fabric pulp 19 having a high yarn count. On either surface of this backing is a base binder layer 20 which covers the entire surface of the backing on which it is applied. The bare diatomaceous earth of the base binder 20 has a layer of pressure sensitive adhesive for attaching the tape to the patient's body. The adhesive 21 only contacts the surface of the base binder and does not touch or go to the back 19 * As a result, a smaller amount of adhesive can be used than has previously been the practice. Compared to, for example, a woven cotton board on which the adhesive is applied directly, 30-40 ° !, less adhesive can be used with good results, because the adhesive does not go to the back at all and the fibers do not separate when the adhesive tape is wound into and out of the roll.

Figure 4 shows that all the warp yarns 22 are parallel and all the weft yarns 23 are parallel to each other and there are rather many times the number of warp yarns compared to the weft yarns. The base binder 20 binds all these yarns together, thus providing a single film of material that can be easily and evenly torn in both directions directly.

5,58590

Different types of man-made nonwovens can be used, especially cellulose man-made nonwovens, e.g. cellulose acetate, sparkler and sparkler acetate. Different types of base binders can be used, but an acrylic latex base is preferred. The water-based acrylic base binder has been used successfully and the solvent-based acrylic base binder has been found to be slightly less water sensitive than the water-based base binder. Such base binders are sold by The B.F. Goodrich Company as 2600X series for aqueous base binders and 2100X series for acrylic solution polymers based on a solvent such as methyl ethyl ketone and n-heptane. Different types of adhesives can also be calendered for the base coat, e.g. plain rubber-based adhesive.

The preferred shape of the ribbon includes, for example, a warp acetate fabric backing having a yarn count of about 70 warp yarns and 20 weft yarns per square centimeter. A base layer of about 0.0127 rnn (0.0005 ") was applied to the other surface of this backing. The BF Goodrich Chemical Company has designated the base binder" Hycar 2100X22 "made in an n-heptane solvent. The properties of this base binder are, on average: 45 Brookfield viscosity 2200 cps, Williams plasticity 2.7 mm, stickiness in the probe test 2500 o grams / cm and 0.83 specific gravity when wet The base binder binds all the yarns of the fabric together evenly into a substantially solid support film.

A certain artificial and natural rubber adhesive, which is prepared by first forming a mixed mixture and then using this mixture with other ingredients to form a refining mixture which is placed on a primed strip substrate, has also proved to be very satisfactory. The premixed blend contained about 6 parts by weight of synthetic isoprene rubber, 26 parts of styrene-polyisoprene-styrene block polymer, 28 parts of light crepe natural rubber, 95 parts of zinc oxide, 24 parts of starch, 1 part of lanol. The refining mixture contained approximately 240 parts of the entire premixed mixture, 55 parts of the ester resin and 55 parts of the wood resin derivative. The artificial rubbers provided excellent adhesion to the skin and the organic rubber provided excellent adhesion to the outer surface of the back when the tape was overlapped with the previously applied tape when forming the dressing. The base binder forms an excellent barrier that prevents the adhesive from entering the fabric when the adhesive only touches the base binder when applied to the tape.

The tear stress is concentrated at the tear point because the base binder binds all the yarns of the backing evenly together, making it easier to obtain the finished tape and the tear mark is smooth and smooth without the tape stretching and without the fibrous tips. In the series of experiments, an average force of about 255.15 g (9 ounces) was required to tear the strip either transversely or longitudinally, with 6,58590 with both tear marks straight and the resulting edges smooth. The base binder also provides an excellent bond between the adhesive and the fabric backing so that the tape does not crack. In addition, the base binder does not react at all to the wetting of the strip. In the experiments, the tape was wrapped around the fingers and the hands were washed in hot water before the tape was removed. After removing the tape, there was no sticky in your hands, · no feeling or trace of the solid mass adhering to the skin. This adhesive tape was also tested with the intention of ensuring its ability to withstand body temperature. The strip sections were placed on thermosetting plastic panels «such as a phenol condensation preparation» and incubated for one hour at 38 ° C. The strips were then immediately pulled out slowly, leaving no trace of adhesive mass on the panels.

The tape according to the invention is thus a smooth-surfaced adhesive tape with a fabric backing, which can be torn directly in both directions under pressure or force which has been possible before. The tape withstands both moisture and heat and can be removed from the patient's skin without leaving it behind. a sticky feel or a trace of adhesive mass. The tape can be easily cleaned in use with a damp cloth. In addition, the manufacture of the tape is economical, especially since the adhesive can be calendered onto the primed backing and less adhesive is needed because the adhesive does not enter the fabric backing. Furthermore, it should be noted that although the tape according to the invention is easily torn, experiments have shown that the tape still retains its tensile strength, which is essentially the same as that of conventional medical tapes.

Claims (4)

7 58590 A non-porous pressure-sensitive adhesive tape for general and surgical use, the tape consisting of a high yarn count woven cellulose-containing man-made fiber web (19), wherein the warp yarns are parallel to each other and the weft yarns are parallel to each other (parallel) to the warp yarns, an acrylic polymer base binder (20) completely covering the surface of the backing (19) and a pressure-sensitive adhesive layer (21) containing both natural rubber and synthetic rubber, characterized in that the backing (19) has a yarn count of the order of 70 warp yarns and 20 weft yarns per square centimeter and the adhesive layer (21) is applied directly on the base binder (20), which prevents the adhesive layer (21) from coming into contact with the backing (19) when fitted on the base binder (20) and prevents moisture from entering the backing (19) into the adhesive. and a straight line tearable in both the transverse and longitudinal directions, leaving clean and smooth non-splitting edges along the tear line. Pressure-sensitive adhesive tape according to Claim 1, characterized in that the backing (19) is woven from filamentary acetate threads (22, 23). Pressure-sensitive adhesive tape according to Claim 1 or 2, characterized in that the base binder layer (20) is a water- or solvent-based acrylic polymer. Pressure-sensitive adhesive tape according to Claim 1 or 2, characterized in that the base binder layer (20) is an acrylic polymer solution in which the solvent is n-heptane.