BANDAGE

Abstract

The invention relates to a bandage comprising a flat web material as a substrate, wherein a self-adhesive cohesive adhesive compound is at least partially applied to both flat sides of the substrate, and the substrate is impregnated with a liquid preparation, characterised in that said adhesive compound comprises an anhydrous cohesive pressure sensitive adhesive which contains natural and/or synthetic rubber, this natural and/or synthetic rubber being dissolved in an organic solvent for application, or the pressure sensitive adhesive being molten for application.

Claims

1. A bandage comprising a flat-web material as substrate, wherein a self-adhesive cohesive adhesive has been at least partially applied on both flat sides of the substrate and the substrate has been impregnated with a liquid preparation, and wherein the self-adhesive cohesive adhesive comprises either an anhydrous cohesive pressure-sensitive adhesive comprising natural rubber and/or synthetic rubber, in which the natural rubber and/or synthetic rubber has been dissolved in an organic solvent for the purposes of application or an anhydrous cohesive pressure-sensitive adhesive which is a melted liquid for the purposes of application.

2. The bandage of claim 1, wherein the anhydrous cohesive pressure-sensitive adhesive which is a melted liquid for the purposes of application comprises natural rubber and/or synthetic rubber.

3. The bandage of claim 1, wherein the bandage is elastic in the longitudinal direction and/or transverse direction.

4. The bandage of claim 1, wherein the liquid preparation is selected from the group consisting of a single-phase solution, a multiphase emulsion, a gel and a foam.

5. The bandage of claim 4, wherein the liquid preparation is a single-phase solution based on a multiphase emulsion based on water with an addition of an inorganic substance, or an organic substance.

6. The bandage of claim 1, wherein the substrate is selected from the group consisting of a woven fabric, a warp-knitted fabric, a weft-knitted fabric and a nonwoven fabric.

7. The bandage of claim 1, wherein the substrate comprises elastic threads, spun or twisted crepe threads, rubber and/or polyurethane elastane threads and combinations thereof.

8. The bandage of claim 1, wherein the application of the self-adhesive cohesive adhesive results in a cohesive coating which is open-pore.

9. The bandage of claim 1, wherein the adhesive has been applied in patterns.

10. The bandage of claim 1, wherein the application of the adhesive is 2 to 20 g/m.sup.2.

11. A method for producing the bandage of claim 1, wherein a substrate in the form of a flat-web material is at least partially coated on both sides with a cohesively self-adhesive pressure-sensitive adhesive and the flat-web material is then converted to bandages and the bandage is then impregnated with a liquid preparation.

12. The method of claim 10, wherein the cohesive adhesive is applied first to one flat side of the flat-web material and then to the second flat side of said flat-web material.

13. The bandage of claim 5, wherein the inorganic substance is a salt.

14. The bandage of claim 5, wherein the organic substance is selected from the group consisting of alcohols, esters, ethers, ketones, and terpenes.

15. The bandage of claim 7, wherein the elastic threads are high twist cotton threads.

16. The bandage of claim 7, wherein the spun or twisted crepe threads are textured polyamide or polyester yarns.

17. The method of claim 11, wherein the substrate is an elastic substrate.

Description

EXAMPLE 1

Cohesive Nonwoven Bandage Containing Cooling Fluid

[0023] The web substrate used is an elastic nonwoven construction type 752, brand name NOWOPRESS 752, manufacturer Karl Otto Braun GmbH & Co., Wolfstein, Germany, wherein the base textile was obtained using the stitch-bonding technique MALIWATT by stitch-over of a rigid polypropylene nonwoven with permanently elastic elastane threads in the longitudinal direction. For details about this support textile, see the table below:

TABLE-US-00001 Material composition of 84% polypropylene, 16% elast. nonwoven type 752 elastane Base nonwoven PP spunbond nonwoven, 35 g/m.sup.2, thermally embossed, color blue (Pantone 18-1662 TPX) Sewing thread 133 dtex elastane (Dorlastan, manufacturer ASAHI Kasai, Dormagen, Germany) Sewing thread density 45 threads per 10 cm width Sewing thread stitch length, 3 mm, open pillar stitch stitching Elasticity Longitudinal direction (warp direction) Stretchability in accordance 220% with DIN 61632 at F = 3 N/cm

[0024] This elastic base textile is, as web material of width 10 cm, coated on both surfaces with a cohesive pressure-sensitive adhesive based on polyisoprene rubber using a knife-over-roll in order to achieve the desired cohesive adhesive effect. The cohesive pressure-sensitive adhesive consists of the following components:

[0025] 1. Solid rubber: cis-1,4-polyisoprene, brand name NATSYN 2200, manufacturer: GOODYEAR, Ohio, USA

[0026] 2. Solvent: isohexane, brand name ISOHEXAN, C6 hydrocarbon mixture of various isomers, manufacturer: BIESTERFELD, Hamburg, Germany

[0027] 3. Antiaging agent: 2,6-di-tert-butyl-p-cresol, brand name IONOL CP, manufacturer: OXIRIS Chemicals, Sant Celoni, Spain

[0028] Production is carried out according to the following instructions: 400 g of isohexane (component 2) are initially charged in a stainless-steel stirring tank and altogether 60.6 g of solid rubber (component 1) are added under stirring in the form of granular material with a particle size of approximately 4 mm. 1.21 g of antiaging agent (component 3) are likewise added as powder. At a stirring speed of 300 rpm, component 3 dissolves immediately in the isohexane, whereas approximately 120 minutes are required for the complete dissolution of component 2. The result is a grayly turbid viscous adhesive having a solids content of 13.1%. The viscosity was measured using a Haake viscometer, model Haake Viscotester VT 2 plus, manufacturer: THERMO SCIENTIFIC FISHER, Braunschweig, Germany, at T=20 C. at 12 500 mPas.

[0029] The elastic nonwoven type 752 is coated in such a way that the 10 cm wide web is fed to a knife-over-roll unit at a transport speed of 5 m/min, with use of lowest possible tensile forces in order to largely maintain the unstretched state of the web type 752. The width of the knife-over-roll is 15 cm. The material web is guided above the roller and below the doctor blade and the pasty adhesive is charged in portions before the doctor blade, with the result that there is always a quantity of approximately 100 g of adhesive on the material web. The gap between doctor blade and roller is adjusted such that the wet application of the adhesive is between 55 and 65 g/m.sup.2 under stretching (in accordance with DIN 61632 at 3 N/cm). Directly after the knife-over-roll, the adhesive-coated material web passes through a drying channel, length 3.0 m, in which the solvent (isohexane) is evaporated from the adhesive with a hot-air stream at T=80 C. The solid adhesive forms a microporous, open-pore film of rubber fragments. The web material leaves the dryer in the dry state and is wound up under low tension to form a roll. The web material is now coated on one side with the dried adhesive; the application quantity is between 7.2 and 8.5 g dry weight. The areal weight of the web material coated on one side is 50.2 to 51.5 g and the stretchability is approximately 190% (both parameters in accordance with DIN 61632 at 3 N/cm). The roll of the web material coated on one side now passes through the knife-over-roll unit and the drying channel, as described above, in a second pass. In this case, the hitherto uncoated side of the substrate is coated with the adhesive in an analogous operation. The web material now coated on both sides leaves the dryer in the dried state and is wound up under low tension to form a roll. The solid adhesive forms a microporous, open-pore film of rubber fragments on both surfaces of the substrate. To avoid the layers of the webs sticking together via the adhesive rubber surface, a separating paper or a separating film is fed as spacer when winding the roll and said paper/film is wrapped up between the layers. The application quantity of the adhesive on the substrate is then altogether between 14.4 and 17.0 g dry weight. The areal weight of the web material coated on both sides is 57.4 to 60.0 g and the stretchability is approximately 160% (both parameters in accordance with DIN 61632 at 3 N/cm).

[0030] A winding core, for example a plastic tube composed of polypropylene, inner diameter 28 mm, wall thickness 1 mm, height 10.0 cm, is then used to wind a roll length of 1.75 m web material under low tension to form a cylindrical spool body, which is the starting material for the production of the fluid bandage according to the invention. The net weight (web material without tube) is 27.0 g. The bandage diameter is 54 mm.

[0031] Mixtures of ethanol/water with or without addition of cooling auxiliaries are used as cooling fluid:

[0032] Cooling fluid KF1: Produced by mixing the following components: [0033] 48 g of ethanol/water mixture (containing 96% by volume of ethanol) [0034] 50 g of water, demineralized [0035] 2.0 g of Eumulgin HRE 40 (emulsifier, manufacturer COGNIS, Dsseldorf, Germany)

[0036] Cooling fluid KF2 (with enhanced cooling action): [0037] Mixture/dissolution of the following components [0038] 45 g of ethanol/water mixture (containing 96% by volume of ethanol) [0039] 50 g of water, demineralized [0040] 0.05 g of camphor [0041] 0.05 g of menthol [0042] 0.20 g of menthyl lactate [0043] 4.70 g of Eumulgin HRE 40 (emulsifier, manufacturer COGNIS, Dsseldorf, Germany)

[0044] A first cold bandage, type KBF1, is produced by placing a spool body in a plastic container with screw-on lid, inner diameter 67 mm, height 110 mm, and slowly pouring 40.0 g of cooling fluid KF1 over it until the fluid is completely absorbed by the bandage. The fluid is homogeneously distributed in the bandage within a minute. A second cold bandage, type KBF2, is produced by placing a spool body in a plastic container with screw-on lid, inner diameter 67 mm, height 110 mm, and slowly pouring 40.0 g of cooling fluid KF2 over it until the fluid is completely absorbed by the bandage. The fluid is homogeneously distributed in the bandage within a minute.

[0045] After a waiting time of 24 hours, the bandages were subjected to a physical test and the following results were ascertained:

TABLE-US-00002 Cold bandage test results Type KBF1 Type KBF2 Weight of fluid bandage (without 67.0 g 67.0 g tube) Stetchability (DIN 61632 at 3 N/cm) 152% 158% Unwinding force (cN/cm) 35.8 cN/cm 47.6 cN/cm Adhesive force, side A/B 22.5 cN/cm 20.8 cN/cm CT.sub.max = Max. cooling 4.2 K. 5.5 K. temperature difference

[0046] The cooling temperature difference ACT is ascertained in an application test on a test subject as follows: the cold bandage is wound on the lower arm of the test subject at a 5-10 cm distance from the elbow as a 2-layer ring which overlaps to form straight edges, and is lightly pressed in order to bond the layers. A digital thermometer with metal sensor tip is then immediately pushed under the bandage so that the tip is centrally positioned. Similarly, the starting temperature of the skin T(S) was ascertained beforehand using a dry ideal bandage in accordance with DIN 61632. The skin temperature under the cold bandage T(B) is measured in intervals of 1 minute (initially) to 15 minutes for a period from t=0 to maximally t=180 minutes. The cooling temperature difference ACT is calculated as the difference T(B)T(S). ACTmax is the maximum cooling temperature difference, i.e. the value T(B)T(S) is maximal.

[0047] In relation to use, the bandages are wound on the lower leg as a spiral bandage under slight stretching of approximately 80% with 50% overlap and the layers are firmly pressed by hand. Surprisingly, the layers form an adhesive bond, even though the cooling fluid also covers the rubber fragments of the cohesive coating. The test subject feels the cooling action immediately after application of the bandages, with the peak of the cooling action being reached after 30-60 minutes. The cooling action persists for altogether approximately 90 to 120 minutes. Subjectively, the test subjects feel a higher cooling action with the bandage KBF2 than with the bandage KBF1.

[0048] Furthermore, the invention also provides a method for producing a bandage comprising a flat-material web as substrate, wherein a self-adhesive cohesive adhesive has been at least partially applied on both flat sides of the substrate, involving applying the adhesive in the form of an anhydrous cohesive pressure-sensitive adhesive comprising natural rubber and/or synthetic rubber, in which pressure-sensitive adhesive the natural rubber and/or synthetic rubber has been dissolved in an organic solvent for the purposes of application or is a melted liquid for the purposes of application, and then either evaporating the solvent or curing the pressure-sensitive adhesive and then impregnating the substrate coated with the cohesive adhesive with a liquid preparation.

EXAMPLE 2

Cohesive Web Bandage Containing Aluminum Acetotartrate

[0049] The web substrate used is an elastic woven-fabric construction type 199, manufacturer: Karl Otto Braun GmbH & Co. KG, Wolfstein, Germany, wherein the elasticity of the base textile in the warp direction results from the combination of permanently elastic elastane threads with rigid cotton yarns. For details about this support textile, see the table below:

TABLE-US-00003 Material composition of 99% cotton, 1% elastane woven fabric type 199 Warp thread-material Warp thread A: 20 tex cotton Warp thread B: 15.6 tex lycra (elastane) surrounded by 24 tex cotton Warp order 4 threads A-1 thread B Thread coun/warp density 110 per 10 cm width Weft thread-material 50 tex cotton Thread count/weft density 130 per 10 cm stretched (DIN 61632) Areal weight, stretched 95 g/m.sup.2 Elasticity In the longitudinal direction (warp direction) Stretchability/retraction 120%/99% in accordance with DIN 61632

[0050] The elastic woven fabric type 199 is coated using the adhesive described in Example 1 on the same knife-over-roll coating machine, using a 10 cm wide web. The application quantity of the adhesive on the substrate is then altogether 13.0 g dry weight. The areal weight of the web material coated on both sides is 108 g and the stretchability is 100% (both parameters in accordance with DIN 61632 at 3 N/cm).

[0051] A winding core, for example a plastic tube composed of polypropylene, inner diameter 28 mm, wall thickness 1 mm, height 10.0 cm, is used to wind a length of 2.0 m web material of the woven fabric type 199 under low tension to form a cylindrical spool body, which is the starting material for the production of the fluid-impregnated bandage according to the invention.

[0052] The net weight (web material without tube) is 44.0 g. The bandage diameter is 57 mm.

[0053] The fluid used is a dilute aqueous solution of aluminum acetotartrate (standardized, see Deutsches Arzneimittelbuch [German pharmacopoeia], 2012 edition (DAB 2012)). This active ingredient has an antiseptic, astringent and antiswelling action and is, for example, used in contusions.

[0054] Fluid KF3: Produced by mixing the following components: [0055] 10 g of aluminum acetotartrate solution as per DAB 2012 [0056] 90 g of water, demineralized [0057] 2.0 g of Eumulgin HRE 40 (emulsifier, manufacturer COGNIS, Dsseldorf, Germany)

[0058] The fluid bandage (KBF3) according to Example 2 is produced by placing a spool body in a plastic container with screw-on lid, inner diameter 67 mm, height 110 mm, and slowly pouring 44.0 g of fluid KF3 over it until the fluid is completely absorbed by the bandage. The fluid is homogeneously distributed in the bandage within a minute.

[0059] After a waiting time of 24 hours, the bandages were subjected to a physical test and the following results were ascertained:

TABLE-US-00004 Cold bandage test results Type KBF3 Weight of fluid bandage 88.0 g (without tube) Stetchability (DIN 61632 at 99% 3 N/cm) Unwinding force (cN/cm) 72.7 cN/cm Adhesive force, side A/B 28.5 cN/cm

[0060] Concerning use, the bandages are wound on the lower leg as a spiral bandage under slight stretching of approximately 60% with 50% overlap and the layers are firmly pressed by hand. Surprisingly, the layers form an adhesive bond, even though the fluid composed of aluminum acetotartrate solution forms an interface layer between the rubber fragments of the cohesive coating. The test subject feels a pleasantly cooling and skin-drying (astringent) action. Swellings recede.