Adhesive tape

• US 6,372,335 B1
• Filed: 11/24/1997
• Issued: 04/16/2002
• Est. Priority Date: 11/30/1996
• Status: Expired due to Term

• Current Assignee: Tesa SE (maxingvest GmbH & Co. KGaA)
• Original Assignee: Beiersdorf AG (maxingvest GmbH & Co. KGaA)
• Inventors: Lühmann, Bernd, Junghans, Andreas
• Primary Examiner(s): ZIRKER, DANIEL R
• Application Number:
  US08/976,802
• Time in Patent Office: 1,604 Days
• Field of Search: 428/317.3, 428/343, 428/354, 428/355.BL
• 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 7/26 Porous or cellular plastics
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]
• CPC Class Codes: Y10T 428/249955 Void-containing component partially impregnated with adjacent component
• CPC Class Codes: Y10T 428/249961 With gradual property change within a component
• CPC Class Codes: Y10T 428/249983 As outermost component
• 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 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/2883 including addition polymer of diene monomer [e.g., SBR, SIS, etc.]
• CPC Class Codes: Y10T 442/2049 Each major face of the fabric has at least one coating or impregnation

Abstract

Adhesive tape for a bond which can be redetached by pulling, without residue or 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, and

b) the foam backing has a modulus of electricity of less than 16 MPa and a thickness of 200-600 μm.

Claims

1. An adhesive tape which can be bonded to a substrate and thereafter released from said substrate without leaving a residue or damaging the substrate by pulling on the adhesive tape, said adhesive tape comprising:

a) a backing consisting of a single-layered foam material, said backing having a thickness of 200-600 μ

m and exhibiting a modulus of elasticity of less 16 MPa; and

b) a self-adhesive composition coated on one or both sides of said backing, said self-adhesive composition exhibiting a ratio of tear strength to stripping force (peel force) of greater than 1.2;

1 at a peel angle of less 10°

from the surface of a bond formed between said adhesive tape and said substrate.

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

3. The adhesive tape according to claim 1, wherein the self-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 further comprise polymer blocks formed by polymerization of 1,3-dienes.

6. The adhesive tape according to claim 1, wherein the self-adhesive composition comprises of tackifiers, and optionally further blend components and/or additives.

7. A The adhesive tape according to claim 1, wherein the foam backing has a modulus of elasticity of 4-15 MPa.

8. The adhesive tape according to claim 1, wherein the foam backing has a thickness of 300-550 μ

m.

9. The adhesive tape according to claim 1, which is in the form of sections, wherein one end of each section comprises a non-tacky grip, and an opposite end of each section optionally comprises an adhesive area which decreases in size towards an end of the section.

10. The adhesive tape according to claim 9, wherein the non-tacky grip is formed by laminating film sections on the self-adhesive composition, wherein the sides of the film sections which contact the self-adhesive composition have been given an anti-adhesive finish.

11. In a method comprising bonding an adhesive tape to a substrate, and thereafter optionally redetaching said adhesive tape from said substrate without leaving a residue and without damaging the substrate by pulling on the adhesive tape, wherein the improvement comprises employing as the adhesive tape an adhesive tape according to claim 1.

12. The method according to claim 11, which further comprises bonding the adhesive tape to a hook, a baseplate or an article to be suspended from said substrate, wherein said bonding of the adhesive tape to said hook, baseplate or article is carried out either before or after the adhesive tape is bonded to said substrate.