EP1177266A1

EP1177266A1 - Support material with a cohesive adhesive substance

Info

Publication number: EP1177266A1
Application number: EP00931100A
Authority: EP
Inventors: Peter Himmelsbach; Andreas B. Kummer; Wolfgang Meyer-Ingold
Original assignee: Beiersdorf AG
Current assignee: Beiersdorf AG
Priority date: 1999-05-11
Filing date: 2000-05-03
Publication date: 2002-02-06
Also published as: AU4915700A; US6812170B1; DE19921743A1; AU762507B2; WO2000068334A1

Abstract

The invention relates to a support material for medical use, which is coated with a contact-holding adhesive on at least one side. The support material has a maximum tensile force of at least 800 cN/cm and an adhesive force on the rear side of not less than 10 cN/cm. The latex-free, cohesive adhesive substance that is applied to the support material contains one or more block copolymers containing less than 65 wt. % styrene and has a tan delta of less than 0.4 at a temperature of 25 DEG C and a frequency of 100 rad/s.

Description

description

CARRIER MATERIAL WITH COHESIVE ADHESIVE

The invention relates to a carrier material coated at least on one side with a latex-free, cohesive adhesive for medical purposes, for example bandages, bandages or bandages, the individual layers or bandages only being safe on themselves and on other substrates, in particular the skin, hair or clothing. are not or only slightly liable.

Cohesively coated carrier materials are known for medical purposes; they can be purchased commercially from Beiersdorf under the names Elohaft ® or Gazofix ®. These products are usually manufactured with an adhesive based on natural rubber.

For some medical indications, sticking to the skin is not necessary. Here it is advantageous if the product only adheres to itself and not to the skin, hair or clothing. These properties of the product promote painless, residue-free removal of the bandage.

In addition to the limited resistance to light, temperature and aging, these products also have the disadvantage of the presence of proteins and peptides, which in some cases can lead to allergies. Furthermore, these systems are not processed as 100% systems, which means that auxiliaries have to be removed from the adhesive after application to the carrier.

Systems without a carrier matrix - i.e. systems without common organic or inorganic solvents or dispersants - are referred to as 100% systems. She who- processed in the elastic or thermoplastic state. A common processing method is the melt.

DE G 86 24 190 describes a cohesive dressing consisting of a carrier material and a coating based on an acrylic resin dispersion. The low shear properties and the removal of the auxiliary during application are disadvantageous here.

DE A 688 430 discloses a tape impregnated with natural latex, the tape undergoing post-treatment with acetic acid. However, such tapes are disadvantageous in terms of flexibility and textile appearance. Furthermore, this method is not advantageous due to the additional post-treatment step.

US 2,238,878 describes a bandage which is coated with a natural latex.

US 3,575,782 discloses a process for the production of elastic covering materials from non-woven fibrous webs and highly elastic rubber or polyurethane threads. The binders of the non-woven material used give it a pressure-sensitive characteristic.

EP 0 885 942 A1 shows an adhesive which has a high UV resistance. Block copolymers based on di-block copolymers SEPS and triblock copolymers SEBS can be used for the blending. An adhesive is not described. The values of the adhesive force on the skin, the backing material and the tack show that adhesion is not achieved.

EP 0 443 263 discloses a low tack adhesive. A use for medical products is not described.

Another adhesive bandage is described in DE-OS 29 12 129, which is produced by the finest distribution of a rubber dispersion. No. 5,692,937 describes an expandable, cohesive bandage which is coated with a polyurethane dispersion

DE 196 31 422 discloses a carrier material which is self-adhesive on at least one side, the self-adhesive composition being a pressure-sensitive hot-melt adhesive composition which, at a frequency of 0.1 rad / s, has a dynamically complex glass transition temperature of less than -3 ° C., preferably of -6 ° C to -30 ° C, very particularly preferably from -9 ° C to -25 ° C, according to the disclosure there, the ratio of the loss modulus (viscous part) to the storage module (elastic part) of the PSA is preferably a frequency of 100 rad / s at 25 ° C greater than 0.7

Also preferred is the ratio of the loss modulus (viscous fraction) to the storage module (elastic fraction) of the hotmelt adhesive at a frequency of 0.1 rad / s at 25 ° C. less than 0.40 Carriers equipped with such an adhesive do not show any cohesive properties set very high adhesive strengths when gluing the bandage to the skin

The object of the invention is to produce a pressure-sensitive coated carrier material which is in particular free of latex and natural rubber, which only adheres to itself and can be removed from the skin without leaving any residues

This object is achieved by a carrier material as described in the main claim. The subclaims relate to advantageous developments of the subject of the invention and particularly advantageous uses of the same

Accordingly, the invention relates to a carrier material coated at least on one side with a pressure-sensitive adhesive for medical purposes with a maximum tensile strength of at least 800 cN / cm and an adhesive force on the back of the carrier of not less than 10 cN / cm, the latex-free, cohesive adhesive applied to the carrier material containing one or contains several block copolymers with a styrene content of less than 65% by weight and has a tan δ of less than 0.4 at a temperature of 25 ° C and a frequency of 100 rad / s.

The high shear strength of the adhesive is achieved through the cohesive nature of the polymer.

The adhesive is advantageously an adhesive melt, which can optionally be doped.

The softening point of the adhesive melt is higher than 50 ° C, since the coating temperature is generally at least 70 ° C, preferably between 90 ° C and 190 ° C, very particularly preferably 75 ° C to 140 ° C. Post-crosslinking by UV or electron beam radiation may be appropriate. This depends on the special structure of the parent polymer or its additives.

For particularly strongly adhesive systems, the cohesive adhesive is preferably based on A-B, A-B-A block copolymers or mixtures thereof. The hard phase A is primarily polystyrene or its derivatives, and the soft phase B is ethylene, propylene, butylene, butadiene, isoprene or mixtures thereof, particularly preferably ethylene, propylene and butylene or mixtures thereof.

The phase B chain can also contain foreign species, such as isoprene, butadiene or similar substances. Polystyrene blocks can also be contained in the soft phase B, namely up to 20% by weight. The total styrene content is always less than 65% by weight, preferably less than 40% by weight, particularly preferably 3 to 35% by weight. Styrene fractions between 3 wt.% And 35 wt.% Are preferred, since a lower styrene fraction makes the adhesive more supple.

The sum of the proportions by weight of the block copolymers in the adhesive is preferably more than 20% by weight, preferably more than 30% by weight, particularly preferably 30 to 70% by weight and most preferably 50 to 70% by weight. The targeted blending of di-block and tri-block copolymers is particularly advantageous, a proportion of di-block copolymers of less than 80% by weight being preferred.

Especially the blending of block copolymers based on SEPS and SEBS is characterized by its wide range of variations. Particular variations of the two types of polymer are advantageous in a ratio of 1: 100 to 100: 1, preferably 1:10 to 10: 1, particularly preferably 1: 3 to 3: 1.

For example, different A / B diblock copolymers from SEBS can be combined with different A / B / A triblock copolymers from SEPS. A combination of different A / B diblock copolymers from SEPS with different A / B / A triblock copolymers from SEBS is also possible. It is also possible to combine different A / B / A triblock copolymers from SEPS with different A / B / A triblock copolymers from SEBS. For some applications, advantages were shown by compounding A / B diblock copolymers from SEBS and SEPS. In a first advantageous embodiment, the adhesive comprises one or more A / B diblock copolymer types based on SEPS and at least one A / B / A tri block copolymer type based on SEBS.

In a further advantageous embodiment, the adhesive comprises one or more A / B diblock copolymer types based on SEBS and at least one A / B / A triblock copolymer type based on SEPS.

In a further advantageous embodiment, the adhesive comprises one or more A B / A triblock copolymer types based on SEPS and at least one A / B / A triblock copolymer type based on SEBS.

In an advantageous embodiment, the cohesive, latex-free adhesive has the following composition:

5% by weight to 90% by weight block copolymers, 5% by weight to 80% by weight tackifiers such as oils, waxes, resins and / or mixtures thereof, preferably mixtures of resins and oils, less than 60% by weight % Plasticizer, less than 15% by weight additives, less than 5% by weight stabilizers

The aliphatic or aromatic oils, waxes and resins used as tackifiers are preferably hydrocarbon oils, waxes and resins, the oils (such as paraffinic hydrocarbon oils) or the waxes (such as paraffinic hydrocarbon waxes) having a favorable effect on the adhesive action due to their consistency the adhesive has at least one aliphatic hydrocarbon resin and at least one aromatic hydrocarbon resin. Medium- or long-chain fatty acids and / or their esters are used as plasticizers. These additives are used to adjust the adhesive properties and stability. If necessary, other stabilizers and other auxiliary substances are used

It is possible to fill the cohesive adhesive with mineral fillers, fibers, hollow or solid microbeads

The cohesive adhesive compositions are preferably set so that they have a dynamic, complex glass transition temperature of less than -30 ° C., preferably less than -50 ° C., very particularly preferably -55 ° C. at a frequency of 0.1 rad / s down to -150 ° C

In particular, orthopedic bandages and bandages place high demands on the adhesive properties. For an ideal application, the adhesive should not have any stickiness. To ensure that it does not slip, the adhesive must have a high shear strength

Through the targeted lowering of the glass transition temperature of the adhesive due to the selection of the tackifier, the plasticizer as well as the polymer molecule size and the molecular distribution of the insert components, the necessary functional adhesion to itself, i.e. the back of the flat structure, is achieved.The high shear strength of the adhesive used here is due to the high Cohesiveness of the block copolymer achieved The low grip is due to the Range of tackifiers and plasticizers used in combination with the block copolymer.

The product properties such as tack and shear stability can be quantified well with the help of dynamic mechanical frequency measurement. Here a shear stress controlled rheometer is used.

The results of this measurement method provide information about the physical properties of a substance by taking the viscoelastic component into account. Here, at a given temperature, the cohesive adhesive mass is set in vibration between two plane-parallel plates with variable frequencies and low deformation (linear visco-elastic range). The quotient (Q = tan δ) between the loss module (G "viscous part) and the storage module (G 'elastic part) is determined with computer-aided control.

Q = tan δ = G'VG '

A high frequency is chosen for the subjective feeling of tackiness (tack) and a low frequency for the shear strength.

A low numerical value means low tack and good shear stability.

In the case of adhesive compositions according to the invention, the ratio of the viscous component to the elastic component at a frequency of 100 rad / s at 25 ° C. is less than 0.4, in particular 0.02 to 0.37 and then 0.04 to 0.28. The adhesive compositions preferably have a ratio of the viscous component to the elastic component at a frequency of 0.1 rad / s at 25 ° C. less than 0.5, preferably between 0.35 and 0.02, very particularly preferably between 0.3 and 0.05. Spinning technology for the application of thermoplastics and adhesives can be used as the preferred method for producing an open-pore, air and water vapor permeable cohesive coating of the adhesive composition on the carrier material.

The contactless coating and application of adhesive masses in the form of adhesive melt masses by spinning or spraying with compressed air or inert gases is already successfully used in many cases.

With high demands on uniformity and low basis weight, however, there are narrow limits for the coating at high viscosities. Especially when applying higher-viscosity adhesives above 10 Pa ^* s, there is a tendency to "blot". Due to basic scientific research on spray jet theory, special spraying methods for higher-viscosity (high-molecular) thermoplastics have been developed.

With the Meltspin, Acufiber and Durafiber processes, thermoplastics can now be processed in the pressure sensitive sector up to 2000 Pa ^* s at 200 ° C. This opens up a wide range of possible applications in the spraying of thermoplastic adhesives.

The advantages of this application technique such as non-contact, geometry-independent coating with a low heat load on the carrier opens up completely new binding specialties.

The multitude of methods are described by Acumeter, J + M Laboratories, Dynafiber, ITO Dynatex Nordson. The flow processes in the spray nozzles are all the same. The melted thermoplastics belong to the group of non-Newtonian liquids with pseudoplastic flow behavior, ie shear stress and coating speed are not linearly connected. The thermoplastic polymers most commonly used as hot melt adhesives consist of linear and / or branched chain molecules. In the process of aerodynamic stretching, the flow speed at the spray thread and the Molecules are more and more disentangled and orient themselves in the direction of flow.

For this reason, all nozzles have an internal mixing principle, in which the adhesive within the nozzle chamber is already surrounded by flowing compressed air. The narrowest gap is the nozzle outlet. The outlet gap can be round or slit-shaped. If this spray thread is sprayed onto a substrate, a so-called tangled nonwoven is created, the structure of which is interlinked. The tangled nonwoven consists of a random, homogeneous arrangement of an intertwined continuous thread.

The nonwoven spun layer, which is applied contactlessly via an array of nozzles depending on the coating width, has a free surface that is many times higher than that of full-surface coatings.

In addition to this, the spinning process also offers some procedural options for the use of partial coatings for adhesive compositions.

It is also possible to spin or spin parts of the fabrics. For example, the threads of a woven or knitted fabric can be wound around, so that the actual coating takes place only on one side, and nevertheless a good layer bond can be created.

A modified, functional use of the fabric is achieved by foaming the adhesive.

The adhesive compositions to be used are preferably foamed with inert gases such as nitrogen, carbon dioxide, noble gases, hydrocarbons or air or mixtures thereof. In some cases, foaming by thermal decomposition of gas-evolving substances such as azo, carbonate and hydrazide compounds has also proven to be suitable.

The degree of foaming, ie the gas content, should be at least about 5% by volume and can range up to about 85% by volume. In practice, values from 10 vol.% To 75% by volume, preferably 50% by volume, well preserved If work is carried out at relatively high temperatures of around 100 ° C and comparatively high internal pressure, very open-pored foam layers are created which are particularly permeable to air and water vapor

The advantageous properties of the device are the good conformability even on uneven surfaces due to the elasticity and plasticity of the foamed device

A particularly suitable process for producing the foamed adhesive compositions according to the invention works according to the foam mix system. Here, the thermoplastic adhesive composition is subjected to the gases provided, such as nitrogen, air, under high pressure at a temperature above the softening point (approximately 120 ° C.) or carbon dioxide in different volume fractions (about 10 vol.% to 80 vol.%) implemented in a stator / rotor system. While the gas admission pressure is greater than 100 bar, the mixed pressures gas / thermoplastic in the system are 40 to 100 bar, preferably 40 to 70 bar Adhesive foam produced in this way can then reach the application unit via a line. Commercial nozzles, extruder or chamber systems are used in the application unit. The device is foamed and the resulting open pores in the mass are the same with the device when a porous carrier is used coated products well permeable to water vapor and air g The amount of adhesive required is significantly reduced without impairing the properties

It is also particularly advantageous for use in medical products if the mass is partially applied to the carrier material, for example by screen printing, thermal screen printing, thermoflexo printing or gravure printing, since carrier materials with a fully adhesive finish can cause mechanical skin irritations under unfavorable conditions during application

The partial application enables the transepidermal loss of water to be removed through controlled channels and improves the evaporation of the skin when sweating, especially when using air and water vapor permeable carrier material. This avoids skin irritation caused by congestion of the body fluids. The created drainage channels allow drainage

The application is preferred in the form of polygeometric domes and very particularly those domes in which the ratio of diameter to height is less than 5 1. Furthermore, other shapes and patterns can also be printed on the carrier material, for example a printed image in the form of alphanumeric character combinations or Patterns such as grids, stripes and zigzag lines. The cohesive adhesive can be evenly distributed on the carrier material, but it can also be applied with different thicknesses or densities across the surface to suit the product

The principle of thermal screen printing is the use of a rotating, heated, seamless, drum-shaped perforated round stencil, which is fed with the preferred mass via a nozzle.A specially shaped nozzle lip (round or square squeegee) presses the mass fed in via a channel through the perforation of the stencil wall onto the Carrier web passed by This is guided against the outer jacket of the heated sieve drum at a speed that corresponds to the speed of rotation of the rotating sieve drum

The small domes are formed using the following mechanism

The nozzle doctor pressure demands the mass through the perforation of the sieve to the carrier material. The size of the calottes is determined by the diameter of the sieve hole. According to the transport speed of the carrier web (rotation speed of the sieve drum), the sieve is lifted from the carrier due to the adhesion of the adhesive in the melt and the internal cohesion of the hot melt is subtracted from the base of the calottes already adhering to the carrier, the limited supply of hot melt adhesive in the perforations with sharp contours, or is demanded by the squeegee pressure on the carrier

At the end of this transport, depending on the rheology of the hotmelt adhesive, it forms more or less strongly over the specified base area curved surface of the spherical cap The ratio of the height to the base of the spherical cap depends on the ratio of the hole diameter to the wall thickness of the sieve drum and the physical properties (flow behavior, surface tension and wetting angle on the carrier material) of the adhesive

In the screen stencil in thermal screen printing, the web / hole ratio can be less than 10 1, preferably less than or equal to 1 1, in particular equal to 1 10

The described mechanism of formation of the domes preferably requires absorbent or at least wettable carrier material near the cohesive mass. Non-wetting carrier surfaces must be pretreated by chemical or physical processes. This can be done by additional measures such as corona discharge or coating with substances that improve the wetting

The size and shape of the domes can be defined in a defined manner with the printing process shown. The adhesive force values relevant for the application, which determine the quality of the products produced, are within very narrow tolerances when properly coated. The base diameter of the domes can be selected from 10 μm to 5000 μm , the height of the spherical caps from 20 μm to approximately 2000 μm, preferably 50 μm to 1000 μm, the small diameter range being intended for smooth carriers, the larger diameter and larger spherical cap height being intended for rough or highly porous carrier materials

The positioning of the domes on the carrier is defined by the geometry of the application, which can be varied within wide limits, for example engraving or sieve geometry. With the help of the parameters shown, the desired property profile of the coating can be adjusted to the various carrier materials and Applications can be set very precisely

The carrier material is preferably coated at a speed of greater than 2 m / min, preferably 20 to 220 m / min, the coating temperature being greater than the softening temperature

The cohesive mass can have a basis weight of greater than 3 g / m ² , preferably between 6 g / m ² and 180 g / m ² , particularly preferably between 9 g / m ² and 140 g / m ² particularly preferably applied between 9 g / m ² and 50 g / m ² on the carrier material

The percentage of the surface coated with the adhesive should be at least 10% and can range up to approximately 95%, for special products preferably 40% to 60% and 70% to 95%. This can be achieved by multiple application or special deformation steps are, where appropriate, masses with different properties can also be used

The combination of the cohesive adhesive and the partial coating ensures that the medical product is securely bonded to itself on the one hand; on the other hand, at least visually recognizable allergic or mechanical skin irritations are ruled out, even when used for several days more a massage effect can be determined by large calottes

Depending on the carrier material and its temperature sensitivity, the mass can be applied directly or first applied to an auxiliary carrier and then transferred to the final carrier. Subsequent calendering of the coated product and / or pretreatment of the carrier, such as corona radiation, for better anchoring of the adhesive layer can also be advantageous his

Furthermore, treatment of the mass with electron beam post-crosslinking or UV radiation can lead to an improvement in the desired properties

It is also within the inventive concept to coat the carrier material on two sides

Suitable support materials are all rigid and elastic flat structures made of synthetic and natural raw materials. Support materials are preferred which, after application of the adhesive, can be used in such a way that they fulfill the properties of a functional dressing Especially for orthopedic applications, the materials should have a high tensile strength of large 1000 cN / cm, preferably 2000 cN / cm to 22000 cN / cm, so that they show functional support

Furthermore, the maximum tensile strength elongation of the carrier materials should be less than 300% at a load of 10 N / cm, particularly less than 30%. With long-stretch bandages, the range from 150% to 250% is preferred. With short-stretch and middle-stretch bandages, a range from 50 to is preferred 150% advantageous and for stretch bandages and bandages the stretch range is 5% to 100%

Textiles such as fabrics, knitted fabrics, scrims, nonwovens, laminates, nets, but also foils, foams and papers are particularly used as carrier materials.These materials can also be pretreated or post-treated , Punching and mounting

The carrier material coated with the mass can have an air permeability of greater than 1 cm ³ / (cm ² xs), in particular greater than 70 cm ³ / (cm ² xs), preferably 5 cm ³ / (cm ² xs) to 200 cm ³ / (cm ² xs), very particularly preferably 15 cm / (cm ² xs) to 120 cm ³ / (cm ² xs), furthermore have a water vapor permeability of greater than 500 g / (m ² x 24h), preferably 770 g / (m ² x 24h) to 5100 g / (m ² x 24h), particularly preferably 990 g / (24h x

Finally, after the coating process, the device can be covered with an adhesive-repellent carrier material, such as siliconized paper, or provided with a wound dressing or padding. The devices are then punched out in the desired size

It is particularly advantageous that the device is sterilized, preferably γ- (gamma) sterilized. This is particularly suitable for subsequent sterilization of a block copolymer-based polymer system which does not contain any double bonds. This applies in particular to the preferred styrene-propylene-ethylene-styrene and Styrene-ethylene-butylene block copolymeπsat There are no significant changes in the properties for the application Another advantage of the fully hydrogenated polymers and additives is their high lightfastness. In the unfilled state, clear to only slightly yellowish compounds with a Hazen number of less than 3, preferably 0 to 2, can be produced. The Hazen (color) number (according to the American water engineer A. Hazen) is the number mg of platinum [as potassium hexachloroplatinate (IV) with cobalt (II) chloride hexahydrate in a ratio of 1, 246: 1 dissolved in 1000 ml of aqueous hydrochloric acid], which the (almost) the same color as the sample in the same layer thickness (source: Römpp Lexikon Chemie - Version 1.3, Stuttgart New York: Georg Thieme Verlag 1997).

The device according to the invention can have an adhesive force on the back of the carrier of at least 0.2 N / cm, in particular an adhesive force between 0.3 N / cm and 5 N / cm, particularly preferably between 0.4 N / cm and 3.0 N / cm. Virtually no adhesive forces will be achieved on other substrates. Adhesive forces of less than 0.3 N / cm can be found in particular on the skin.

The adhesive values (adhesive side to adhesive side) at a 180 ° angle of the test coatings on a polyester film were 22 cN / cm for adhesive mass A (see previous table) with a mass application of 20 g / m ² and for mass B with a mass application 18 g / cm ² 37 cN / cm.

Advantageous carrier materials according to the invention with their inherent shadows are disclosed below.

Backing material A

• The carrier material coated with adhesive has an air permeability of more than 15 cm ³ / (cm ² xs) and a water vapor permeability of more than 500 g / (24 xs).

• The adhesive contains one or more SEBS and / or SEPS tri-block copolymer type / s. • The sum of the percentages by weight of all block copolymers in the adhesive is 30% by weight to 70% by weight.

• The adhesive contains an aliphatic and an aromatic hydrocarbon resin. • The backing material has an adhesive mass of 6 to 180 g / m ² .

• The Hazen number is less than 3.

Backing material B

• The adhesive contains one or more SEPS and / or SEBS three-block copolymer type / s.

• The sum of the percentages by weight of all block copolymers in the adhesive is 30% by weight to 70% by weight.

• The Hazen number is less than 3.

The carrier material is particularly suitable for medical products, in particular plasters, medical fixations, wound coverings, orthopedic or phlebological bandages and bandages.

Furthermore, however, it is possible to use the carrier material for technical, reversible fixations that can be released without damaging the substrate.

In the following, devices for producing carrier materials according to the invention are to be illustrated using several figures. In the simplest case according to FIG. 1, the device consists of an unwinding (1) and reeling (2) as well as the carrier web (4) and the spinneret (3).

To optimize the properties, several nozzles (3) can also be connected in series according to FIG.

For special carriers, a corona pretreatment (6) or a subsequent calender station can be included in the test setup, as shown in FIG. 3. It is also possible to equip the coated sides of the carrier material differently. A combination of a spun adhesive with a partial spot coating can be advantageous. The adhesive masses on the different sides may also be different. A special version has a SEBS adhesive on one side while the other side contains a SEPS-based adhesive.

Examples of the invention are to be described below without wishing to restrict the invention unnecessarily.

example 1

According to the invention, a self-adhesive bandage was produced, which was spun on both sides with an adhesive. Due to the properties described below, the bandage can be used as a lining material for support bandages, which, due to the indications, must also be applied to joints of the human musculoskeletal system over several days.

The carrier material consisted of an inelastic cotton fabric with a maximum tensile strength of greater than 15 N / cm and a maximum tensile strength elongation of less than 40%.

This cohesive adhesive compound was composed as follows: a SEPS block copolymer consisting of hard and soft segments and a styrene content in the polymer of 13 mol%; the proportion in the mass was 65

% By weight (Kuraray Co.) a paraffin hydrocarbon resin with a proportion of the mass of 34% by weight an anti-aging agent with a proportion of less than 1.0% by weight (Irganox 1010

Ciba)

The components used were homogenized in a thermal mixer at 185 ° C for 3.5 h.

The softening point of this adhesive was approximately 85 ° C. (DIN 52011), and the adhesive showed a viscosity of 2100 mPas at 175 ° C. (DIN 53018, Brookfield DV II, column 21). The glass transition temperature was less than -50 ° C according to the above method. The adhesive was spun with a nozzle and applied flat to the backing. The direct coating on both sides was carried out at 20 m / min at a temperature of 130 ° C. The carrier material was coated with 22 g / m ² .

Adhesive forces of 0.6 N / cm on itself were found. No sticking to the skin has been observed.

Example 2

This example describes a nonwoven fabric consisting of three layers with a flexible middle layer made of polypropylene and two outer layers consisting of the adhesive. The maximum tensile force of the fabric after solidification was 25 N / cm, the maximum tensile force elongation was 48%. The weight per unit area of the middle layer was 33 g / m ² , that of the outer layers was 17 and 5 g / m ² .

The adhesive composition is as follows:

a SEPS block copolymer (Septon 2002, Kuraray) 100 an aromatic hydrocarbon resin (Kristalex F85, Hercules) 38 an aliphatic hydrocarbon resin (Escorez 5380, Exxon) 38 a mineral oil (Odina G33) 75

Irganox 1010 2

The adhesive was homogenized at 185 ° C in a thermomixer. The tan δ of the adhesive was 25 ° C and a frequency of 100 rad / s 0.14 The adhesive was spun with a nozzle and applied flat to the carrier. The direct, flat coating was carried out at a temperature of 137 ° C. with a web speed of 35 m / min. The adhesive force was determined to be 13 cN / cm

Example 3

Example 3 discloses a bandage for orthopedic purposes. Here, an elastic fabric based on a cotton / elastane mixture was used. The fabric had a basis weight of 150 g / m ² in the unstretched state. The number of warp threads was 14 / cm. The fabric was constructed so that the elastomer thread , which is wound with two cotton threads, followed by 4 crimped cotton threads. The maximum tensile strength of the flat structure after solidification was 23 N / cm and the maximum tensile force elongation was 130%.

The adhesive composition was as follows

a SEBS block copolymer (Kraton G 1652, Shell) 59.8 an aromatic hydrocarbon resin (Kπstalex F85, Hercules) 4.8 an aliphatic hydrocarbon resin (Escorez 5380, Exxon) 4.9 a mineral oil (Pioneer 2071, Hansen & Rosenthal) 29.9

Irganox 1010 0.6

The adhesive was homogenized at 185 ° C in a thermomixer. The tan δ of the adhesive was 0.05 at 25 ° C and a frequency of 100 rad / s. The adhesive was partially applied to the carrier using thermal screen printing. A 60 mesh was used for this / 200 μm from Stork used The coating was carried out at a temperature of 137 ° C. with a web speed of 35 m / mm. The adhesive force was determined to be 0.63 cN / cm

Example 4

A bandage for phlebological purposes is disclosed here. An elastic fabric based on twisted cotton thread was used.The fabric had a basis weight of 300 g / m ² in the unstretched state. The number of warp threads was 17 / cm. The maximum tensile strength of the flat structure was 120 after solidification N / cm and the maximum tensile strain was 110%

The adhesive composition was as follows

a SEBS block copolymer (Kraton G 1652, Shell) 100 an aromatic hydrocarbon resin (Kπstalex F85, Hercules) 28 an aliphatic hydrocarbon resin (Escorez 5380, Exxon) 12 a mineral oil (Pioneer 2076, Hansen & Rosenthal) 60

Irganox 1010 2

The adhesive was homogenized at 175 ° C. in a thermomixer. The tan δ of the adhesive was 0.05 at 25 ° C. and a frequency of 100 rad / s. The adhesive was foamed using a foam generator (from Nordson) and applied to the entire surface Carrier applied This resulted in an uneven coating. The degree of foaming of the adhesive was 48%. The coating was carried out at a temperature of 141 ° C with a web speed of 5 m / min. The adhesive force was determined at 0.83 cN / cm the skin was not found The bandage showed an air permeability of 26 cm ³ / (cm ² xs)

Example 5

A very open gauze was coated for a special dressing fixation. The maximum tensile strength of the sheet was 13 N / cm after solidification, the maximum tensile elongation was 21%. The weight per unit area of the gauze was 32 g / m ² The adhesive composition is as follows:

a SEBS block copolymer (Kraton G 1652, Shell) 100 an aromatic hydrocarbon resin (Kristalex F85, Hercules) 28 an aliphatic hydrocarbon resin (Escorez 5380, Exxon) 12 a mineral oil (Pioneer 2076, Hansen & Rosenthal) 60

Irganox 1010 2

The adhesive was homogenized at 180 ° C in a thermal mixer. The tan δ of the adhesive mass measured at 25 ° C and a frequency of 100 rad / s was 0.05. The adhesive was spun with a nozzle and applied to the surface of the surface at 20 g / m ^{2 on} each side. The direct, flat coating was carried out at a temperature of 137 ° C. with a web speed of 35 m / min. The adhesive force was determined to be 63 cN / cm.

Claims

claims

Carrier material coated with at least one adhesive layer for medical purposes with a maximum tensile strength of at least 800 cN / cm and an adhesive force on the back of the carrier of not less than 10 cN / cm, the latex-free, cohesive adhesive compound applied to the carrier material containing one or more block copolymers with a styrene content of contains less than 65% by weight and has a tan δ of less than 0.4 at a temperature of 25 ° C. and a frequency of 100 rad / s

Carrier material according to claim 1, characterized in that the adhesive composition is based on a block copolymer, in particular AB or ABA block copolymers or mixtures thereof, phase A primarily polystyrene or its derivatives and phase B ethylene, propylene, butylene, butadiene, isoprene or mixtures thereof , particularly preferred here are ethylene, propylene and butylene or mixtures thereof

Support material according to claims 1 and 2, characterized in that the total styrene content in the polymer is less than 40% by weight, particularly preferably 3 to

Carrier material according to claims 1 to 3, characterized in that the adhesive masses at a frequency of 0.1 rad / s have a dynamically complex glass transition temperature of less than -30 ° C, preferably less than -50 ° C, very particularly preferably of -55 ° C to -150 ° C

Carrier material according to claims 1 to 4, characterized in that the adhesive is partially applied and / or is foamed with an inert gas

Carrier material according to claims 1 to 5, characterized in that the adhesive is applied by screen printing, thermal screen printing or gravure printing

7. backing material according to claims 1 to 6, characterized in that the adhesive is brought in the form of polygeometric domes on the backing material.

8. backing material according to claims 1 to 7, characterized in that the adhesive with a basis weight of greater than 3 g / m ² , preferably between 6 g / m ² and 180 g / m ² , very particularly preferably between 9 g / m ² and 140 g / m ² , is coated on the carrier material.

9. carrier material according to at least one of the preceding claims, characterized in that the maximum tensile force elongation of the carrier material is less than 300%, preferably 5 to 100%, 50 to 150% or 150% to 250%, particularly preferably less than 30% and / or the maximum tensile force 1000 to 22000 cN / cm.

10. Backing material according to at least one of the preceding claims, characterized in that the adhesive force of the coated backing material is between 0.4 N / cm and 3.0 N / cm.

11. Backing material according to at least one of the preceding claims, characterized in that the pressure-sensitive adhesive backing material is covered after application or is provided with a wound dressing, padding.

12. carrier material according to at least one of the preceding claims, characterized in that the pressure-sensitive adhesive carrier material is sterilized, preferably γ (gamma) sterilized.

13. Use of a carrier material according to at least one of the preceding claims for medical products, in particular plasters, medical fixings, wound coverings, orthopedic or phlebological bandages and bandages.

14. Use of a carrier material according to at least one of the preceding claims for technical, reversible fixations which can be released without damaging the substrate.