Adhesive tape

• US 6,004,665 A
• Filed: 11/24/1997
• Issued: 12/21/1999
• Est. Priority Date: 11/30/1996
• Status: Expired due to Term

• Current Assignee: Tesa SE (Maxingvest AG)
• Original Assignee: Beiersdorf AG (Maxingvest AG)
• Inventors: Junghans, Andreas, Luhmann, Bernd
• Primary Examiner(s): ZIRKER, DANIEL R
• Application Number:
  US08/976,554
• Time in Patent Office: 757 Days
• Field of Search: 428/317.3, 428/355 BL, 428/317.1, 428/317.7, 428/343
• US Class Current: 428/317.3
• CPC Class Codes: C08L 53/00 Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
• 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 7/22 Plastics; Metallised plastics
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: Y10T 428/249982 With component specified as adhesive or bonding agent
• CPC Class Codes: Y10T 428/249983 As outermost component
• CPC Class Codes: Y10T 428/249985 Composition of adhesive or bonding component specified
• 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 428/2883 including addition polymer of diene monomer [e.g., SBR, SIS, etc.]

Abstract

Adhesive tape for a bond which can be redetached by pulling without residue and without damage, having a foam backing coated on one or both sides with a self-adhesive composition, characterized in that

a) on at least one of the two sides of the foam backing there is applied a self-adhesive composition whose ratio of tear strength to stripping force (peel force) at a peel angle of less than 10° to the bond surface is greater than 1.2:1,

b) the elongation at break of the adhesive tape is greater than the elongation at break of the foam backing, and

c) the foam backing tears during the redetachment of the bond by pulling (stripping).

Claims

1. An adhesive tape comprising a foam backing which is coated on one or both sides with a pressure sensitive adhesive composition, wherein the pressure sensitive adhesive composition exhibits a ratio of tear strength to stripping force (peel force) of greater than 1.2:

1 measured at a peel angle of less than 10°

from a surface of a bond formed between said pressure sensitive adhesive composition and a substrate, and wherein the adhesive tape exhibits an elongation at break which is greater than an elongation at break exhibited by the foam backing, the adhesive tape can be redetached from a substrate to which the adhesive tape is bonded without leaving a residue and without damage to the substrate by pulling on the adhesive tape, and the foam backing tears when the adhesive tape is redetached from a substrate by pulling on the adhesive tape.

2. The adhesive tape according to claim 1, wherein the foam backing is coated on both sides with the pressure sensitive adhesive composition.

3. The adhesive tape according to claim 1, wherein the pressure sensitive adhesive composition is based on block copolymers.

4. The adhesive tape according to claim 3, wherein the block copolymers comprise polymer blocks of vinylaromatic compounds.

5. The adhesive tape according to claim 4, wherein the block copolymers comprise polymer blocks of vinylaromatic compounds (A blocks) and polymer blocks formed by polymerization of 1,3-dienes (D blocks).

6. The adhesive tape according to claim 1, wherein the pressure sensitive adhesive composition comprises tackifiers.

7. The adhesive tape according to claim 6, wherein the pressure sensitive adhesive composition further comprises blend components and/or additives.

8. The adhesive tape according to claim 1, wherein the foam backing exhibits an elongation at break which is less than the elongation at break of the pressure sensitive adhesive composition which determines the tear strength of the adhesive tape.

9. The adhesive tape according to claim 1, wherein the pressure sensitive adhesive composition, the foam backing or both the pressure sensitive adhesive composition and the foam backing comprises at least two layers.

10. The adhesive tape according to claim 1, which is in the form of a plurality of sections, wherein one end of each section has a non-tacky grip tab and another end optionally comprises an adhesive area which decreases toward that end.

11. The adhesive tape according to claim 10, wherein the grip tab is formed by laminated-on film sections whose sides in contact with the pressure sensitive adhesive composition comprise a release adhesive finish.

12. In a method comprising bonding an adhesive tape to a substrate and thereafter redetaching said adhesive tape from said substrate by pulling on an end of said adhesive tape, wherein the improvement comprises using as said adhesive tape the adhesive tape according to any one of claims 1-11.

13. The method according to claim 12, which further comprises bonding said adhesive tape to a hook, a base plate or an article which is to be suspended from said substrate, and the adhesive tape is optionally preassembled on said hook, base plate or article.