Adhesive film strip

• US 5,626,931 A
• Filed: 07/27/1995
• Issued: 05/06/1997
• Est. Priority Date: 08/12/1994
• Status: Expired due to Term

• Current Assignee: Tesa SE (maxingvest GmbH & Co. KGaA)
• Original Assignee: Beiersdorf AG (maxingvest GmbH & Co. KGaA)
• Inventors: L uhmann, Bernd
• Primary Examiner(s): Ahmad, Nasser
• Application Number:
  US08/508,288
• Time in Patent Office: 649 Days
• Field of Search: 428/40, 428/41, 428/42, 428/192, 428/194, 428/201, 428/202, 428/212, 428/214, 428/354, 428/343, 206/411
• US Class Current: 428/40.1
• 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 7/20 characterised by their carriers
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/1471 Protective layer
• CPC Class Codes: Y10T 428/1476 Release layer
• CPC Class Codes: Y10T 428/1486 Ornamental, decorative, pattern, or indicia
• CPC Class Codes: Y10T 428/24777 Edge feature
• CPC Class Codes: Y10T 428/24793 Comprising discontinuous or differential impregnation or bond
• CPC Class Codes: Y10T 428/24851 Intermediate layer is discontinuous or differential
• CPC Class Codes: Y10T 428/2486 with outer strippable or release layer
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/24959 of adhesive layers
• 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

Abstract

Adhesive film strip for an adhesive bond which can be separated again by pulling on the strip in the direction of the bond plane, character in that the bond area decreases at one end of the adhesive film strip, while the other end serves as tab for pulling.

Claims

1. An adhesive film strip for an adhesive bond which can be separated again by pulling on the strip in the direction of the bond plane, the adhesive film strip having upper and lower surfaces and first and second ends, the first strip end terminating in a pointed, serrated, convex curved or wavy shape and the first strip from said end extending to said second end which serves as a tab for pulling, the bond area of the strip increasing from said first end toward said second end, said second end-tab being provided with a cover which is UV-opaque, said strip being adhesive on its upper and lower surfaces, the adhesive being based on a thermoplastic rubber and tackifying resins, the adhesive film having high elasticity and low plasticity, and the adhesion being lower than the cohesion, the adhesive strength substantially disappearing on stretching of the film, the ratio between peel force and tear strength being at least 1:

1.5, and the adhesive composition being self-adhesive or heat-activatable.

2. An adhesive film strip according to claim 1, wherein the bond area decreases through the one strip end due to the adhesive film surface having been rendered progressively less adhesive toward the strip end by means of a cover or print reducing the adhesive area.

3. An adhesive film strip according to claim 1, wherein the capacity of the cover is effected by a dimensionally stable plastic film laminated onto both sides of the adhesive film.

4. An adhesive film strip for an adhesive bond which can be separated again by pulling on the strip in the direction of the bond plane, the adhesive film strip having upper and lower surfaces and first and second ends, the first strip end terminating in a pointed, serrated, convex curved or wavy shape and the first strip from said end extending to said second end which serves as a tab for pulling, the bond area of the strip increasing from said first end toward said second end, said second end-tab being provided with a cover which is UV-opaque, said strip being adhesive on its upper and lower surfaces, the strip comprising a highly extensible, virtually non-resilient base film and a pressure-sensitive self-adhesive composition on both sides of the base film, the base film having a sufficiently high tensile strength at break that it does not tear before the adhesive film strip has been peeled off from the substrate.

5. An adhesive film strip according to claim 4, wherein the bond area decreases through the one strip end due to the adhesive film surface having been rendered progressively less adhesive toward the strip end by means of a cover or print.

6. An adhesive film strip according to claim 4, wherein the cover is provided with a dimensionally stable plastic film laminated onto both sides of the adhesive film.