Adhesive tape

• US 6,280,840 B1
• Filed: 04/20/1999
• Issued: 08/28/2001
• Est. Priority Date: 05/09/1998
• Status: Expired due to Fees

• Current Assignee: Tesa SE (Maxingvest AG)
• Original Assignee: Beiersdorf AG (Maxingvest AG)
• Inventors: Lühmann, Bernd, Junghans, Andreas
• Primary Examiner(s): ZIRKER, DANIEL R
• Application Number:
  US09/294,856
• Time in Patent Office: 861 Days
• Field of Search: 428/343, 428/317.3, 428/355.RA, 428/355.BL, 428/317.7, 428/354, 427/208, 427/208.4, 427/208.6, 248/205.3
• US Class Current: 428/343
• CPC Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• 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 2400/243 in the substrate
• CPC Class Codes: C09J 7/26 Porous or cellular plastics
• CPC Class Codes: C09J 7/29 Laminated material metallised plastics C09J7/22
• 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 428/2861 having readily strippable combined with readily readhearable properties [e.g., stick-ons, etc.]
• 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 without residue or damage by pulling, having a backing coated on one or both sides with a self-adhesive composition, characterized in that

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

b) the backing has been subjected to controlled pretreatment/damaging in such a way that the detachment force (stripping force) is lower than that of a similar self-adhesive tape with a backing which has not been so pretreated/damaged, and

c) the tear strength of the backing is insufficient for redetachment without residue or damage.

Claims

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

a) a self-adhesive composition whose ratio of tear strength to stripping force (peel strength) at a peel angle of less than 10°

to the bond surface is greater than 1.2;

1 is applied to at least one of the two sides of the backing,

b) the backing has been subjected to controlled pretreatment/damaging in such a way that the detachment force (stripping force) is lower than that of a similar self-adhesive tape with a backing which has not been so pretreated/damaged, and

c) the tear strength of the backing is insufficient for redetachment without residue or damage.

2. Adhesive tape according to claim 1, wherein the backing is a single-layer or multilayer backing with at least one unfoamed layer.

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

4. Adhesive tape according to claim 1, wherein the backing has a multilayer structure.

5. Adhesive tape according to claim 4, wherein at least one layer of the multilayer backing is a foamed layer.

6. Adhesive tape according to claim 1, wherein the self-adhesive composition is based on block copolymers.

7. Adhesive tape according to claim 6, wherein the self-adhesive composition is based on block copolymers comprising polymer blocks of vinylaromatic compounds (A blocks) and blocks formed by polymerization of 1,3-dienes (D blocks).

8. Adhesive tape according to claim 6, wherein the self-adhesive composition comprises tackifiers.

9. Adhesive tape according to claim 6, wherein the pretreatment/damaging of the backing is carried out by means selected from full cuts, partial cuts, perforation or punching.

10. Adhesive according to claim 6, wherein the damage sites penetrate the backing in part or fully.

11. Adhesive tape according to claim 6, which it is in the form of sections, one end of the section having a non-tacky grip tab and the other end, optionally having an adhesive area which decreases towards the end.

12. Adhesive tape according to claim 6, which comprises a grip tab formed by film sections, applied by lamination, whose sides in contact with the self-adhesive composition have been given an anti-adhesive finish.

13. Method according to claim 1, wherein the section is coated on both sides with self-adhesive composition and is used together with a hook, a baseplate or an article which is to be suspended, and, optionally, the section is preassembled on such articles.

14. A method of forming an adhesive bond on a surface, and thereafter releasing said bond without leaving a residue on said surface, and without damaging said surface, said method comprising:

a) providing a section of an adhesive tape according to any one of claims 1-12;

b) applying said section to said surface to form said bond; and

c) pulling on one end of said section to release said bond from said surface without leaving a residue on said surface, and without damaging said surface.

15. Adhesive tape according to claim 2, wherein the unfoamed layer is a film backing.

16. Adhesive tape according to claim 6, wherein the block copolymers comprise vinylaromatic blocks.