Adhesive sheet strip

• US 6,866,235 B2
• Filed: 03/15/2002
• Issued: 03/15/2005
• Est. Priority Date: 03/20/2001
• Status: Expired due to Fees

• Current Assignee: Tesa SE (maxingvest GmbH & Co. KGaA)
• Original Assignee: Tesa AG (maxingvest GmbH & Co. KGaA)
• Inventors: Quandt, Jürgen Christian, Kartheus, Holger, Zimmermann, Dieter
• Primary Examiner(s): ZIRKER, DANIEL R
• Application Number:
  US10/099,783
• Publication Number:
  US 20030054164A1
• Time in Patent Office: 1,096 Days
• Field of Search: 248/205.3, 248/301, 248/304, 428/354, 428/355.N, 428/343, 427/208, 427/208.4
• US Class Current: 248/205.3
• CPC Class Codes: C09J 175/04 Polyurethanes
• 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 2421/006 in the substrate
• CPC Class Codes: C09J 2475/00 Presence of polyurethane
• CPC Class Codes: C09J 2475/006 in the substrate
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• 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 428/2896 including nitrogen containing condensation polymer [e.g., polyurethane, polyisocyanate, etc.]

Abstract

An adhesive sheet strip for a redetachable bond, removable from a joint by pulling in the direction of the bond plane, having a nonadhering grip tab and a subsequent single-sidedly or double-sidedly adhering strip, which comprises of:

• • a) a backing composed of a film having a tensile strength of 2-20 N/cm and an elongation at break of 200-800%, and
  • b) applied to at least one side thereof, a polyurethane-based adhesive comprising:
    • 60-80% by weight of an aliphatic isocyanate/polyol crosslinking system,
    • 15-35% by weight of a filler, and
    • 0.05-0.20% by weight of an activator, based on the total weight of the adhesive.

Claims

1. An adhesive sheet strip for a redetachable bond, removable from a joint by pulling in the direction of the bond plane, having a nonadhering grip tab and a subsequent single-sided or double-sided adhering strip, which comprises:

a) a backing composed of a film having a tensile strength of 2-20 N/cm and an elongation at break of 200-800%, and

b) applied to at least one side thereof polyurethane based adhesive comprising;

60-80% by weight of on aliphatic isocyanate/polyol crosslinking system.

15-35% by weight of a filler, and

0.05-0.20% by weight of an activator, based on the total weight of the adhesive.

2. The adhesive sheet strip as claimed in claim 1, wherein the film is 40-80 μ

m thick.

3. The adhesive sheet strip of claim 2 wherein the film is made of a compound selected from the group consisting of polyethylene, polypropylene and polyurethane.

4. The adhesive sheet strip as claimed in claim 1, wherein the adhesive is crosslinked thermally and, optionally, additionally by electron-beam curing, and optionally is additionally crosslinked at the cut edges, which are formed after the adhesive sheet strip has been cut, by UV or by further electron-beam curing.

5. The adhesive sheet strip as claimed in claim 1, wherein the alphatic isocyanate/polyol crosslinking system comprises of:

(1) an optionally modified hexamethylene diisocyanate as the aliphatic isocyanate component and (2) a polyetherpolyol and castor oil, which is optionally stabilized with tocopherols, as the polyol component.

6. The adhesive sheet strip as claimed in claim 1, wherein the filler is selected from the group consisting of an absorbent, zinc oxide, calcium carbonate, magnesium carbonate and mixtures thereof.

7. The adhesive sheet strip as claimed in claim 1, wherein the adhesive has been applied to both sides of the backing.

8. The adhesive sheet strip as claimed in claim 1, wherein the adhesive is 10-80 μ

m thick.

9. The adhesive sheet strip as claimed in claim 1, wherein the entire thickness of the adhesive sheet strip is 50-5000 μ

m.

10. The adhesive sheet strip as claimed in claim 1, wherein the entire thickness of the adhesive sheet strip is 100-2000 μ

m.

11. A method of providing an adhesive bond to a surface which comprises applying the adhesive sheet strip of any one of claims 1-10 to said surface wherein parting of the adhesive bond, by pulling on said sheet strip in the direction of the bond plane, renders said surface damage-free and residueless.