Pressure-sensitive adhesive tape or sheet

Abstract

The present invention relates to A pressure-sensitive adhesive tape or sheet comprising a substrate comprising a nonwoven fabric and a pressure-sensitive adhesive layer disposed on at least one side of the substrate, the pressure-sensitive adhesive tape or sheet having a plurality of penetrating pores which penetrate the substrate and the pressure-sensitive adhesive layer so that corners of the penetrating pores are aligned in at least one direction, the penetrating pores having a flat polygonal shape, and in which, the penetration pore has, among the corners aligned in one direction, at least two corners facing each other in one direction each having an angle of less than 90°; a pressure-sensitive adhesive tape or sheet comprising a substrate comprising a nonwoven fabric and a pressure-sensitive adhesive layer disposed on at least one side of the substrate, the pressure-sensitive adhesive tape or sheet having a plurality of pores aligned in at least one direction, the pores having a shape in which at least two corners facing each other in one direction each has an angle of less than 90°, the pores including penetrating and non-penetrating pores, the pressure-sensitive adhesive tape or sheet having a penetration ratio of a series of adjacent pores of 50% or more and less than 100%, and in which the penetrating and non-penetrating pores are disposed randomly; and a pressure-sensitive adhesive tape or sheet comprising a substrate including nonwoven fabric and a pressure-sensitive adhesive layer disposed on at least one side of the substrate, the pressure-sensitive adhesive tape or sheet having a plurality of pores so that edges of the pores are aligned in at least one direction, in which a distance between one alignment of the pores and another alignment of the pores adjacent thereto is in the range of 1 to 15 mm.

Description

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1A is a drawing showing an example of the penetrating pore pattern in the pressure-sensitive adhesive tape or sheet of the present invention.

FIG. 1B is a drawing showing another example of the penetrating pore pattern in the pressure-sensitive adhesive tape or sheet of the invention.

FIG. 2A is a drawing showing an example of the penetrating pore shape in the pressure-sensitive adhesive tape or sheet of the invention.

FIG. 2B is a drawing showing another example of the penetrating pore shape in the pressure-sensitive adhesive tape or sheet of the invention.

FIG. 2C is a drawing showing still another example of the penetrating pore shape in the pressure-sensitive adhesive tape or sheet of the invention.

FIG. 2D is a drawing showing further another example of the penetrating pore shape in the pressure-sensitive adhesive tape or sheet of the invention.

FIG. 3 is a drawing showing the method of measuring a longest length (P) up to the cut edge for evaluating the hand tearing property.

FIG. 4A is a drawing schematically showing a penetrating pore included in the pressure-sensitive adhesive tape or sheet of the invention.

FIG. 4B is a drawing schematically showing another penetrating pore included in the pressure-sensitive adhesive tape or sheet of the invention.

FIG. 4C is a drawing schematically showing a non-penetrating pore included in the pressure-sensitive adhesive tape or sheet of the invention.

FIG. 5 is a drawing schematically showing a projection form included in punched rolls when adhesive tapes prepared in the Examples and Comparative Examples are punched.

FIG. 6 is a drawing schematically showing a sheet cut surface with regard to a hand tearing property test of the Examples.

FIG. 7 is a photograph showing pores included in the pressure-sensitive adhesive sheet. (Example 4)

FIG. 8 is a photograph showing pores included in the pressure-sensitive adhesive sheet. (Comparative Example 4).

Claims

1. A pressure-sensitive adhesive tape or sheet comprising: a substrate comprising a nonwoven fabric; anda pressure-sensitive adhesive layer disposed on at least one side of the substrate,said pressure-sensitive adhesive tape or sheet having a plurality of penetrating pores which penetrate the substrate and the pressure-sensitive adhesive layer so that corners of said penetrating pores are aligned in at least one direction,said penetrating pores having a flat polygonal shape, andwherein said penetration pore has, among the corners aligned in one direction, at least two corners facing each other in one direction each having an angle of less than 90°.

2. The pressure-sensitive adhesive tape or sheet according to claim 1, wherein the flat polygonal shape of said penetrating pore is a flat hexagonal shape or a flat transformed-hexagonal shape.

3. The pressure-sensitive adhesive tape or sheet according to claim 1, wherein said penetrating pore is formed by punching with an abacus bead-shaped metal mold.

4. The pressure-sensitive adhesive tape or sheet according to claim 1, wherein a distance between the corner of one penetrating pore having an angle of less than 90° and the corner of another penetrating pore adjacent thereto having an angle of less than 90°, said penetrating pores being aligned, is in the range of 0.3 mm to 3 mm.

5. The pressure-sensitive adhesive tape or sheet according to claim 1, wherein a distance between one penetrating pore and another penetrating pore adjacent thereto, said penetrating pores being aligned, is equal to or longer than a length of a flattened part of the penetrating pore.

6. The pressure-sensitive adhesive tape or sheet according to claim 1, wherein the nonwoven fabric is formed by a thermoplastic resin.

7. The pressure-sensitive adhesive tape or sheet according to claim 1, wherein the substrate comprises a binder impregnated therein.

8. The pressure-sensitive adhesive tape or sheet according to claim 1, which is subjected to a peeling treatment on the side of the substrate opposite to the side on which the pressure-sensitive adhesive layer is disposed.

9. The pressure-sensitive adhesive tape or sheet according to claim 1, which is wound in a roll form for keeping.

10. A pressure-sensitive adhesive tape or sheet comprising: a substrate comprising a nonwoven fabric; anda pressure-sensitive adhesive layer disposed on at least one side of the substrate,said pressure-sensitive adhesive tape or sheet having a plurality of pores aligned in at least one direction,said pores having a shape in which at least two corners facing each other in one direction each has an angle of less than 90°,said pores including penetrating and non-penetrating pores,said pressure-sensitive adhesive tape or sheet having a penetration ratio of a series of adjacent pores of 50% or more and less than 100%, andwherein the penetrating and non-penetrating pores are disposed randomly.

11. The pressure-sensitive adhesive tape or sheet according to claim 10, wherein a distance between one pore and another pore adjacent thereto among pores aligned in at least one direction is in the range of 0.3 to 0.75 mm.

12. The pressure-sensitive adhesive tape or sheet according to claim 10, wherein the pore has a length of long-sided part in the range of 0.3 to 0.75 mm.

13. The pressure-sensitive adhesive tape or sheet according to claim 10, wherein the penetrating pore has a size in the range of 1×10−4 to 3 mm2.

14. The pressure-sensitive adhesive tape or sheet according to claim 10, wherein the nonwoven fabric is formed by a thermoplastic resin.

15. A pressure-sensitive adhesive tape or sheet comprising: a substrate comprising nonwoven fabric; anda pressure-sensitive adhesive layer disposed on at least one side of the substrate,said pressure-sensitive adhesive tape or sheet having a plurality of pores so that edges of said pores are aligned in at least one direction,wherein a distance between one alignment of said pores and another alignment of said pores adjacent thereto is in the range of 1 to 15 mm.

16. The pressure-sensitive adhesive tape or sheet according to claim 15, wherein a distance between one alignment of said pores and another alignment of said pores adjacent thereto is in the range of 1 to 10 mm.

17. The pressure-sensitive adhesive tape or sheet according to claim 15, wherein the nonwoven fabric is formed by a thermoplastic resin.

18. The pressure-sensitive adhesive tape or sheet according to claim 15, wherein the substrate comprises a binder impregnated therein.

19. The pressure-sensitive adhesive tape or sheet according to claim 15, which is subjected to a peeling treatment on the side of the substrate opposite to the side on which the pressure-sensitive adhesive layer is disposed.

20. The pressure-sensitive adhesive tape or sheet according to claim 15, which is wound in a roll for keeping.