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1. WO2007109593 - ARTICLE ADHÉSIF FEUILLE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

WHAT IS CLAIMED IS:

1. A medical adhesive tape, comprising a hot melt pressure sensitive adhesive layer in a pattern comprising at least two linear strips of pressure sensitive adhesive crossing each other to form a lattice pattern;
wherein a plurality of parallelogrammic openings free of adhesive are formed by the strips in the lattice pattern, with each parallelogrammic opening having a major diagonal line (A), a minor diagonal line (B);
wherein the length of the major diagonal line (A) is from 0.5mm to 10mm; the length of the minor diagonal line (B) is from 0.3 to 7 mm; and
wherein the adhesive free area defined by the parallelogrammic openings is greater than 25%; and
wherein the hot-melt pressure sensitive adhesive layer has a recovery of at least 35% as measured by the Creep Compliance test.

2. A medical adhesive tape, comprising a hot-melt pressure sensitive adhesive layer with a pattern comprising at least two linear strips of pressure sensitive adhesive crossing each other to form a lattice pattern;
wherein a plurality of parallelogrammic openings free of adhesive are formed by the strips in the lattice pattern, with each parallelogrammic opening having a major diagonal line (A), a minor diagonal line (B);
wherein the length of the major diagonal line (A) is from 0.5mm to 10mm; the length of the minor diagonal line (B) is from 0.3 to 7 mm; and
wherein the adhesive free area defined by the parallelogrammic openings is greater than 25%; and
wherein the pressure sensitive adhesive layer does not exhibit flow after at least 19 days at 66°C .

3. A medical adhesive tape, comprising a hot-melt pressure sensitive adhesive layer with a pattern comprising at least two linear strips of pressure sensitive adhesive crossing each other to form a lattice pattern;

wherein a plurality of parallelogrammic openings free of adhesive are formed by the strips in the lattice pattern, with each parallelogrammic opening having a major diagonal line (A), a minor diagonal line (B);
wherein the length of the major diagonal line (A) is from 0.5mm to 10mm; the length of the minor diagonal line (B) is from 0.3 to 7 mm; and the ratio of the width (C) of the linear adhesive strip between the parallelogrammic openings to the minor diagonal line length (B) is from 0.1 to 3 when (C) is measured at the narrowest point between the minor diagonal lines (B) of adjacent parallelogrammic openings;
wherein the pressure sensitive adhesive layer has a recovery of at least 35% as measured by the Creep Compliance test

4. The medical adhesive tape of any one of claims 1 to 2, wherein the ratio of the width (C) of the linear adhesive strip between the parallelogrammic openings to the minor diagonal line length (B) is from 0.1 to 3 when (C) is measured at the narrowest point between the minor diagonal lines (B) of adjacent parallelogrammic openings.

5. The medical adhesive tape of any one of claims 1 to 3, wherein the ratio of the major diagonal line (A) of the opening to the minor diagonal line (B) thereof is from 15 to 1.

6. The medical adhesive tape of any one of claims 1 to 3, wherein the density of parallelogrammic openings is at least 5 openings per cm .

7. The medical adhesive tape of any one of claims 1 to 3, wherein the density of the parallelogrammic openings is at most 150 openings per cm2,

8. The medical adhesive tape of any one of claims 1 to 3, wherein the thickness of the adhesive layer is from 5 to 1000 μm.

9. The medical adhesive tape of any one of claims 1 to 3, wherein the coating weight of the adhesive layer is from 7 to 200 g/m2.

10. The medical adhesive tape of any one of claims 1 to 3, wherein the pressure sensitive adhesive comprises a copolymer of (i) at least one monoethylenic unsaturated (meth)acrylate having an alkyl group with at least 4 carbon atoms on average and (ii) at least one monoethylenic unsaturation-reinforcing monomer.

11. The medical adhesive tape of any one of claims 1 to 3, wherein the pressure sensitive adhesive layer further comprises a film- forming component.

12. The medical adhesive tape of claim 11, wherein the film-forming component comprises a non-tacky thermoplastic resin having a softening point falling within a range of 25 to 300°C.