BANDAGE, HOT-MELT ADHESIVE FOR PRODUCING A BANDAGE,USE AND METHOD FOR THE PRODUCTION OF A HOT-MELT ADHESIVE

Abstract

The invention relates to the technical field of cohesive bandages. The invention relates to a bandage comprising a flat web material as a substrate, both main sides of the substrate being coated at least partially with a hot-melt adhesive. The invention also relates to a hot-melt adhesive for producing a bandage, to the use of a hot-melt adhesive for producing bandages, and to a method for producing a bandage. The hot-melt adhesive is based on a first polyolefin having—a proportion of 1-butene-derived monomer units; a proportion of ethylene-derived monomer units; and the hot-melt adhesive further comprises: at least one tackifier consisting of hydrocarbon resin and/or of hydrogenated hydrocarbon resin. The hot-melt adhesive can also contain a second polyolefin, preferably an amorphous polypropylene homo- or copolymer.

Claims

1. A bandage comprising a flat web material as a substrate, both main sides of the substrate being at least partially coated with a hot melt adhesive comprising a first polyolefin of: a proportion of monomer units derived from of 1-butene; and a proportion of monomer units derived from ethylene; and wherein the hot melt adhesive further comprises: at least one tackifier of hydrocarbon resin and/or of hydrogenated hydrocarbon resin.

2. A bandage of claim 1, wherein the hot melt adhesive comprises at least a second polyolefin.

3. A bandage of claim 2, wherein the combined proportions of the first and second polyolefins in the hot melt adhesive is from 17 to 43 wt %.

4. A bandage according to claim 1, wherein in the hot melt adhesive the proportionate ratio (in wt %) of tackifier to total polyolefin is in the range of 0.6 to 3.

5. A bandage according to claim 1, wherein the hot melt adhesive further comprises a lubricant additive.

6. The bandage of claim 5, wherein the relative proportion of the lubricant additive is at least 5% by weight.

7. The bandage according to claim 1, wherein the proportion of 1-butene derived monomer units in the first polyolefin is 80 to 92 wt %.

8. The bandage according to claim 1, wherein the hot melt adhesive has a melt viscosity of 1,000 to 50,000 mPa.Math.s, measurable according to EN ISO 3219.

9. The bandage according to claim 1, wherein the hot melt adhesive has a film strength of 0.5 to 1.5 N/mm.sup.2, according to DIN 53504.

10. The bandage according to claim 1, wherein the hot melt adhesive has an elongation at break of 700 to 1200%, measurable according to DIN 53504.

11. The bandage according to claim 1, wherein the substrate is a woven or nonwoven textile.

12. A hot melt adhesive for making a bandage according to claim 1, wherein the hot melt adhesive is based on a first polyolefin, comprising a proportion of monomer units derived from 1-butene; a proportion of monomer units derived from ethylene; and wherein the hot melt adhesive further comprises: at least one tackifier selected from at least one of a hydrocarbon resin and a hydrogenated hydrocarbon resin; wherein the peel strength at room temperature of a composite of two substrates coated with the hotmelt adhesive is at least 1 to 10 N/25 mm, measurable according to ASTM D 1876-01.

13. A method of manufacturing bandages comprising applying a hot melt adhesive to a substrate, the hot melt adhesive based on a first polyolefin, the first polyolefin comprising: a proportion of monomer units derived from 1-butene; and a proportion of monomer units derived from ethylene; wherein the hot melt adhesive further comprises at least one tackifier comprising hydrocarbon resin and/or hydrogenated hydrocarbon resin.

14. A method of manufacturing a bandage comprising the following steps: Providing a flat web material as substrate; providing a hot melt adhesive according to claim 12; and double-sided application of the hotmelt adhesive to the substrate.

15. The method of claim 14, wherein the hot melt adhesive is provided solvent-free.

16. The bandage according to claim 2, wherein the second polyolefin is amorphous.

17. The bandage according to claim 16, wherein the second polyolefin is propylene-based.

18. The bandage according to claim 17, wherein the second polyolefin is a blend of propylene homopolymer and propylene-based copolymer.

19. The bandage according to claim 5, wherein the lubricant is a wax.

20. The bandage according to claim 11, wherein the woven or nonwoven textile is elastic in a longitudinal and/or a transverse direction.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0047] The invention is explained in more detail below in examples of embodiments and with reference to figures, without limiting the invention to these specific examples of embodiments.

[0048] It shows:

[0049] FIG. 1 Diagram of the results from the qualitative skin adhesion test according to example 4

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

EXAMPLE 1

[0050] A hot melt adhesive is mixed from the following ingredients:

TABLE-US-00001 Proportion (% by weight) Compounded butene-1/ethylene co-polymer (72 wt % 15 butene-1; 13 wt % ethylene; 15 wt % tackifier). Amorphous polyolefin (blend of propylene homopolymer 20 and propylene-ethylene copolymer, low molecular weight) Hydrocarbon resin (cycloaliphatic hydrocarbon resin, 35 amorphous, low molecular weight, water bright) Polypropylene wax (low molecular weight, from 28 metallocene catalysis) Stabilizer 2

EXAMPLE 2

[0051] The melt viscosity of the adhesive according to Example 1 was determined according to EN ISO 3219 and was 22′000 mPa.Math.s. The film strength of the adhesive was measured according to DIN 53504 and was 0.9 N/mm. The elongation at break of the adhesive was also determined according to DIN 53504 and was 900%.

EXAMPLE 3

[0052] A peel strength test was performed according to ASTM D 1876-01. An untreated 23my PET film was used as the substrate. The composition from Example 1 was layered directly onto a PET substrate through wide slot nozzles. The thickness of the adhesive layer was 12-15 g/cm.sup.2. The coated substrates were stored for 24 h at 23° C. and 50% relative humidity.

[0053] The specimens were bonded with the adhesive sides facing each other and lightly pressed. A test strip of 100×25 mm was cut from the composite using a Japanese knife and rolled twice in both directions with a weight of 2 kg. The test strip was then stored for another 20 min. The thickness of the resulting adhesive layer after the bonding step was 24 to 30 g/m.sup.2. At least 4 sample strips are produced for each sample material. The T-peel measurement was performed on a tensile testing machine from Instron, with the gripper arms set to a separation speed of 300 mm/min. The force was measured by the tensile testing machine over the entire pull-off distance of 100 mm and the arithmetic mean value over the measured distance (minus the first and last 10% of the distance) was calculated.

[0054] The maximum, minimum, and average forces for a single test strip were 8N/25 mm, 2N/25 mm, and 5N/25 mm, respectively. The average force per section averaged over all specimens was 5N/25 mm.

EXAMPLE 4

[0055] A qualitative assessment of the adhesion of the hot melt adhesive and the bandage coated with the hot melt adhesive to human skin was performed on 20 test subjects. The adhesives and substrates measured are shown in the table below:

TABLE-US-00002 Label Adhesive Substrate Coating M11.159 Hotmelt PPE, based on PET 23my film 25 gsm thermoplastic rubber, with high peel strength M11.180 Hotmelt PPE based on PET 23my film 25 gsm thermoplastic rubber with low peel strength M11.1506 Hotmelt PSA, acrylate- PET 23my film 100 gsm based with weak to medium peel strength M13.1048 Hotmelt PPE based on PET 23my film 25 gsm thermoplastic rubber with medium peel strength Ex. 1, Based on 1-butene/ PET 23my film 12-15 gsm smooth ethylene co-polymer carrier Ex. 1, Based on 1-butene/ Elastic fabric 12-15 gsm textile ethylene co-polymer made of cotton carrier and elastane

[0056] The test strips were each coated with the adhesive using a wide slit nozzle, and the coated substrates were stored for 24 h at 23° C. and 50% relative humidity.

[0057] Then, one test strip per adhesive was applied to the forearm of each of the 20 test subjects under manual pressure and the test strips were left on the skin for 20 min. At the end of the 20 min, the 6 test strips were sequentially peeled off the skin of the test subjects and the test subjects qualitatively assessed the adhesion according to the following scale: 5—Strongest adhesion; 4—Significant adhesion; 3—Medium adhesion; 2—Light adhesion; 1—Minimal adhesion; 0—No adhesion.

[0058] The results of the tests are shown in FIG. 1. From the tests, it can be seen that the hotmelt adhesive according to Example 1 still shows a low residual adhesion when coated onto a smooth backing. However, in none of the 20 test subjects did the hotmelt adhesive coated on bandage material show adhesion.