DE7713955U1 - POROESE, AIR PERMEABLE, SELF-ADHESIVE STRIP FOR USE AS A DRESSING MATERIAL - Google Patents

Description

Lentia Limited Liability Company Chemical and pharmaceutical products - industrial supplies 8000 Munich 2, Schwanthalerstraße 39

Porous, air-permeable, self-adhesive strips

This invention relates to porous, self-adhesive strips, particularly those for use in Wound dressings are suitable, as well as a method for their manufacture.

By means of the method described in Austrian patent no. 291 445 it is possible to use a «porous, air-permeable base, preferably a fleece, an air-permeable, porous adhesive tape, which is suitable for wound treatment. If one tries now the one described in this patent specification Process for the production of air-permeable, self-adhesive strips on the backing of a woven Using the substance as used in normal wound plasters, there are numerous difficulties. It is not possible to get enough impregnation liquid through these very dense and difficult fabrics

7713955 09/22/77

ί ί ·:.: P- ... · "" y LENTlA GMBH

'' · ·. «■,, rfeam. and chorni. Evawjnlne - Induilrlebedarf

8 Munich 2, S * «v> nihalershOfje

- 2 - ToMon 55 + 181/82 FS-Mr. 052/3071

Bring the fabric through to the adhesive, since the main part of this impregnation liquid is from the individual twisted threads are sucked off by capillary forces and do not come into effect on the surface of the adhesive can. It also shows that the impregnation agent has an undesirable stiffening effect on the fabric, so that the resulting adhesive strips for the desired application, the wound treatment, as a result of their stiffness are not usable.

Attempts to prevent this by diluting the impregnating agent accordingly resulted in an unsatisfactory

* Adequate adhesion of the adhesive to the fabric. Surprisingly, it has been found that when using a very thin tissue, which is used under the name "gauze" in the dressing industry for wound treatment, a usable adhesive tape suitable for wound treatment can be obtained.

The present invention relates to self-adhesive, porous, air-permeable strips for use as dressing material, consisting of an air-permeable supporting material, a porous adhesive layer and optionally a protective, adhesive-repellent pad, characterized in that the supporting Material referred to as "gauze" in the dressing industry thinner fabric is, as well as a process for the production of this porous, air-permeable, self-adhesive Strips, especially those that are suitable for use in wound dressings, by applying a self-adhesive, pressure-sensitive adhesive on an adhesive-repellent Support, for example a siliconized paper, subsequent drying and unification of the s; created layer structure with a strip of an air-

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7713955 09/22/77

NTI A GWSH

"· · · .R-i. U. Phtiftn. F --i ,.» ■ ·. ■ in

8 Munich 2, 5 - ^ alenirafje

"" 3 - iolofon 554481/82 ( ⁷ S-No. 052/3870

permeable material, a propellant is added to the adhesive before application, which decomposes on drying and forms pores, whereupon that obtained after the union with the air-permeable material Layer structure on the side of the air-permeable material with one compatible with the adhesive Impregnation agent, which penetrates to the adhesive film, is soaked, then solidifies the laminate by drying is, characterized in that the air-permeable material referred to in the dressing industry as "gauze" thinner tissue is used.

An emulsion adhesive made from self-adhesive, pressure-sensitive acrylic acid ester * '! and acrylic acid ester copolymers is placed on a base, preferably a siliconized paper or film, in the desired shape

2 Starch approx. 35 to 65 g dry matter per m spread and dried. The incorporated blowing agent creates continuous pores in the adhesive. At the end of the coating channel, the gauze is placed on the adhesive layer, creating a laminate consisting of silicone paper, porous adhesive or gauze. This gauze is not impregnated.

This laminate is then coated from the side of the gauze with a suitable impregnating agent compatible with the adhesive. This impregnating agent, preferably an acrylic acid ester copolymer with a dry content of 30 % with the addition of a thickener and preferably a propellant, penetrates through the gauze to the porous adhesive.

When drying, a layer structure is created, consisting made of a base, preferably a siliconized paper, adhesive and gauze, the adhesive being

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7713955 08/22/77

.NiBH ^Γ

8 Munich 2, · •. • ■ «nnthalersfrolje

- 4 _ Won S54481 / 82 FS no. OS? / 3871

pragniermittel is fixed on the gauze. As more desirable As a side effect, the gauze solidifies, especially at the intersection points of the threads, which means a higher stability of the fabric against mechanical stress is given.

The layer structure obtained by this process can now be made to various widths after removing the base cut and wound into rolls. However, the entire laminate is preferably made of silicone paper, Glue and gauze cut into strips and rolled into rolls. Only when used after a If the corresponding piece of the laminate has been cut from the roll, the silicone paper is removed and the so exposed adhesive surface applied.

In the example given below, the process and the substances used are described in more detail.

7713955 09/22/77

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LENTIA GMBH aera u (ifiarm F '/ ^ msse - lndusiriefaeiiarf 8 Munich 2, V "'.nfaialerstrafje 39 Telephone SS 4 4 ή ι / 52 FS no. 052 / 387S

Example:

An emulsion adhesive made from self-adhesive, pressure-sensitive acrylic acid esters and acrylic acid ester copolymers The following composition is applied to a siliconized paper web by means of a doctor blade in a Applied thickness from 0.1 to 0.15 mm.

Cold crosslinkable polyacrylic ester copolymer
Polyacrylic and butyl ester, polyvinyl isobutyl ether
Polyacrylic acid
Ammonium carbonate

Emulsion Emulsion Emulsion Emulsion Emulsion

250 parts 300 parts

30 parts 7 parts

30 pieces,

This adhesive in which the propellant is incorporated and which is modified in its cohesive and adhesive properties by adding a resin emulsion, and the like Spreadability is adjusted by the thickener, is siliconized immediately after application Paper web dried in a drying tunnel at approx. 80 ° C. At this temperature, it disintegrates as a propellant used ammonium bicarbonate in ammonia and carbonic acid. This creates pores in the adhesive. At the end of the drying tunnel, the porous adhesive film is covered with a suitable Tissue brought into contact. Preferably, one commercially available under the designation 28 thread gauze is used Fabric used. This fabric consists of 12 threads of viscose yarn no. 42 in the weft and in the warp 16 threads of rayon yarn No. 36. After weaving, this fabric was washed, bleached and dried straight. At the end of the drying tunnel, a laminate of silicone paper, porous adhesive and fabric is created.

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7713955 09/22/77

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This laminate is then coated from the side of the fabric with a suitable impregnating agent compatible with the adhesive. This impregnating agent, in this case an acrylic acid ester copolymer with a solids content of 30% with the addition of a thickener and preferably a propellant, penetrates through the fabric to the porous living material film. During the subsequent drying, ucj adhesive film is anchored to the threads of the fabric. At the same time, the threads of the fabric are fixed to one another at the crossing points, so that the very loose fabric desirably has a higher mechanical strength.

This method can be used for fabrics with a setting between 17 threads / cm up to 45 threads / cm.

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7713955 22.09.7J

Claims (2)

■ · ■ "· ■ ·· ■ ··:: IENTIA GMBH" · π. «. (! iiiirm. products - Indusifleüedarl - 7 - 8 Munich 2, SdwanthaJerstrofte 'olefon S54481 / 82 FS-No. 052/3873 lan s ρ r ü c h e 1..Self-adhesive, porous, air-permeable strip for use as a dressing material, consisting of an air-permeable load-bearing material, a porous one Adhesive layer and optionally a protective, adhesive-repellent backing, thereby characterized in that the supporting material sheds what is known in the dressing industry as "gauze" Is fabric, which preferably has a fabric density of 2
Has 17 to 45 threads per cm. 2. Strip according to claim 1, characterized in that a modified acrylic acid ester copolymer is used as the adhesive is used. Lentia limited liability company chemical and pharmaceutical E-products - industrial supplies 0.Z.621
April 13, 1977 7713955 09/22/77