Redetachable device

• US 7,121,515 B2
• Filed: 12/11/2001
• Issued: 10/17/2006
• Est. Priority Date: 12/21/2000
• Status: Expired due to Fees

• Current Assignee: Tesa SE (Maxingvest AG)
• Original Assignee: Tesa AG (Maxingvest AG)
• Inventors: Krawinkel, Thorsten, Lühmann, Bernd, Junghans, Andreas, Franck, Achim
• Primary Examiner(s): ZIRKER, DANIEL R
• Application Number:
  US10/014,484
• Publication Number:
  US 20020112823A1
• Time in Patent Office: 1,771 Days
• Field of Search: 248/205.3, 248/301, 248/304, 248/467, 248/683, 428/40.1, 428/41.3, 428/41.8, 428/42.1, 428/100, 428/194, 428/343
• US Class Current: 248/205.3
• CPC Class Codes: A47G 1/175 Stretch releasing adhesives
• 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 2301/312 parameters being the characterizing feature
• CPC Class Codes: C09J 7/20 characterised by their carriers
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/1452 Polymer derived only from ethylenically unsaturated monomer
• CPC Class Codes: Y10T 428/1476 Release layer
• CPC Class Codes: Y10T 428/1486 Ornamental, decorative, pattern, or indicia
• CPC Class Codes: Y10T 428/24017 Hook or barb
• CPC Class Codes: Y10T 428/24793 Comprising discontinuous or differential impregnation or bond
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer

Abstract

A redetachable self-adhesive device

• • a) whose reverse face is bonded with a strip of a double-sidedly adhering adhesive sheet in such a way that one end of the adhesive sheet projects beyond the device as a grip tab,
  • b) the adhesive sheet is such that the bond made with it is redetachable by stretching pulling on the grip tab of the strip in the direction of the bond plane,
  • wherein
  • c) on its reverse face (2) the device (1), in the region (3A, 3B) situated against the grip tab (6) of the adhesive sheet strip (5) or and also partly against the free adhesive composition, has an average roughness R_a of 0.4–25 μm.

Claims

1. A redetachable self-adhesive device, in the form of a structure

a) comprising a surface which is bonded to one side of a double-sided adhesive strip with at least one end of the adhesive strip projecting beyond at least one edge of said surface as a grip tab,

b) the adhesive strip being redetachable by pulling on the grip tab of the strip to stretch the strip in the direction of a plane formed between the strip and the surface it is bonded to,

wherein

c) said surface, in the area immediately adjacent to said at least one end of the adhesive strip projecting as a grip tab, has an average roughness R_a of 2–

20 μ

m and has an average depth of roughness R_z of 2–

100 μ

m.

2. The device as claimed in claim 1, wherein the area of the surface having the average roughness R_a is produced together with the device by injection molding, or wherein the method of production of said area is selected from the group consisting of etching, grinding, embossing or spark erosion.

3. The device as claimed in claim 1, wherein said surface has two opposite edges wherein the areas of said surface immediately adjacent to said two opposite edges of said surface have said average roughness R_a.

4. The device as claimed in claim 1, further comprising spacers on the surface of the device to which the adhesive strip is bonded wherein the heights of said spacers are less than the thickness of the adhesive strip.

5. The device as claimed in claim 1, wherein the double-sided adhesive strip is elastically or plastically extensible with or without a carrier in between the two sides of said double-sided adhesive strip.

6. The device as claimed in claim 1, wherein the adhesion of the double-sided adhesive strip is less than the cohesion, the adhesion largely disappears when the strip is extended, and the ratio of peel force to tear load is at least 1:

2.0, the double-sided adhesive strip being based on thermoplastic rubber and tackifying resins.

7. The device as claimed in claim 1, wherein the side of the double-sided adhesive strip opposite the side that is bonded to the surface of the device is lined with a release laminate or a release film.

8. The device as claimed in claim 1, wherein said device comprises a hook or latching projection.

9. The device of claim 7, wherein said release laminate or release film is a siliconized release paper.