Adhesive tape strip

• US 6,544,639 B1
• Filed: 09/09/1999
• Issued: 04/08/2003
• Est. Priority Date: 09/19/1998
• Status: Expired due to Term

• Current Assignee: Tesa SE (maxingvest GmbH & Co. KGaA)
• Original Assignee: Tesa AG (maxingvest GmbH & Co. KGaA)
• Inventors: Krawinkel, Thorsten, Lühmann, Bernd
• Primary Examiner(s): Morris, Terrel
• Assistant Examiner(s): WACHTEL, ALEXIS A
• Application Number:
  US09/391,995
• Time in Patent Office: 1,307 Days
• Field of Search: 428/343, 428/347, 428/192, 428/200, 428/202
• US Class Current: 428/343
• CPC Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• CPC Class Codes: C09J 2301/124 the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
• CPC Class Codes: C09J 2301/308 the adhesive tape or sheet losing adhesive strength when being stretched, e.g. stretch adhesive
• CPC Class Codes: C09J 2453/00 Presence of block copolymer
• CPC Class Codes: C09J 7/10 without carriers
• CPC Class Codes: C09J 7/26 Porous or cellular plastics
• CPC Class Codes: Y10T 428/24777 Edge feature
• CPC Class Codes: Y10T 428/24843 with heat sealable or heat releasable adhesive layer
• CPC Class Codes: Y10T 428/2486 with outer strippable or release layer
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/2817 Heat sealable

Abstract

Adhesive tape strip for a rereleasable adhesive bond, which can be removed from a bonded joint by pulling in the direction of the bond plane, characterized in that the bonding area decreases in the region of the grip tab or in the pressure-sensitive adhesive region directly bordering the grip tab.

Claims

1. An adhesive tape strip for bonding adhesively to a surface along a bond plane, which tape can be removed from the surface by pulling in the direction of the bond plane, the tape strip having upper and lower planar surfaces, a first longitudinal end and a second, opposite longitudinal end, the second end being in the form of a grip tab extending from the second end to a border with an adhesive bonding region of the strip, the lower planar surface of the strip bearing a pressure-sensitive adhesive, the adhesive bonding region extending from the first end to the border,

wherein a lateral width of the adhesive

increases from the border in the direction of the second end to at least a location of the grip tab between the border and the second end and/or

decreases from the border in the direction of the first end to at least a location of the adhesive bonding region between the border and the first end.

2. The adhesive tape strip according to claim 1, wherein the width of the adhesive at a longitudinal mid-way point between the border and the first end is less than 90% of the width at the border.

3. The adhesive tape strip according to claim 2, wherein the width of the adhesive at a longitudinal mid-way point between the border and the first end is less than 75% of the width at the border.

4. The adhesive tape strip according to claim 1, wherein the width of the adhesive increases from the first end in a direction toward the second end.

5. The adhesive tape strip according to claim 1, wherein the width of the adhesive decreases continuously from the border to the first end.

6. The adhesive tape strip according to claim 4, wherein a longitudinal intermediate region of the adhesive bonding region is defined between a first intermediate point located between the border and the first end, and a second intermediate point located between the first intermediate point and the border;

and wherein the width of the adhesive decreases from the border towards the second intermediate point, and from the first intermediate point towards the first end.

7. The adhesive tape strip according to claim 6, wherein a width of the adhesive along the intermediate region is of a constant width in a longitudinal direction.

8. The adhesive tape strip according to claim 6, wherein the width of the adhesive in the intermediate region decreases in a direction from the second intermediate point towards the first intermediate point, but a degree of decrease in width of the adhesive in the intermediate region is less than a degree of decrease in width from the border towards the second intermediate point and less than a degree of decrease in width from the first intermediate point towards the first end.

9. The adhesive tape strip according to claim 4, wherein the first end is in a form chosen from the group consisting of a point, a zigzag, a convex curvature and corrugation.

10. The adhesive tape strip according to claim 4, wherein the width of the adhesive applied to the strip in the adhesive region is independent from the width of the of the strip itself in the adhesive region, so that an increase in the width of the adhesive from the first end toward the border does not necessarily require a change in width of the strip in the adhesive bonding region, the strip being non-adhesive in those portions thereof where the adhesive has a width less than the width of the strip.

11. The adhesive tape strip according to claim 1, wherein the grip tab is non-adhesive at least on the lower surface thereof.

12. The adhesive tape strip according to claim 1, wherein the grip tab is rendered non-adhesive by applying a cover to at least the lower surface thereof.

13. The adhesive tape strip according to claim 2, wherein the cover is UV-impermeable.

14. The adhesive tape strip according to claim 2, wherein the cover comprises a dimensionally stable polymer film.

15. The adhesive tape strip according to claim 2, wherein the cover is applied to the upper and lower surface of the grip tab.

16. The adhesive tape strip according to claim 1, wherein the strip comprises one or more foam-containing layers.

17. The adhesive tape strip according to claim 1, wherein the tape strip comprises a composition of thermoplastic rubber and tackifying resins, the tape strip having high elasticity and low plasticity, and wherein its adhesion is less than its cohesion, a ratio of peel force to tensile strength being at least 1:

1.5, and wherein it is self-adhesive or heat-activatable.

18. The adhesive tape strip according to claim 1, wherein the tape strip comprises a highly extensible, virtually non-resilient backing film having a front side and rear side, and a pressure-sensitive adhesive composition on both front and rear sides of the backing film, the backing film having a sufficiently high tensile strength at break such that it does not tear before the tape strip has been peeled from a substrate to which it has been applied.