Chemically Crosslinkable Adhesive Strips That Can Be Detached By Pulling In The Direction Of The Bond Plane Of Adhesion

• US 20070275240A1
• Filed: 11/16/2004
• Published: 11/29/2007
• Est. Priority Date: 12/23/2003
• Status: Abandoned Application

• Current Assignee: Tesa AG (Maxingvest AG)
• Original Assignee: Tesa AG (Maxingvest AG)
• Inventors: Krawinkel, Thorsten
• Application Number:
  US10/581,767
• Publication Number:
  US 20070275240A1
• Time in Patent Office: Days
• US Class Current: 428/356
• CPC Class Codes: C08K 3/10 Metal compounds
• CPC Class Codes: C08K 5/0091 Complexes with metal-heteroatom-bonds
• CPC Class Codes: C08L 53/005 Modified block copolymers
• CPC Class Codes: C09J 153/005 Modified block copolymers
• 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 2301/408 additives as essential feature of the adhesive layer
• CPC Class Codes: C09J 7/387 Block-copolymers
• CPC Class Codes: Y10T 428/2857 including metal or compound thereof or natural rubber

Abstract

An adhesive for an adhesive film strip, comprising a mixture of an acid-modified or acid anhydride-modified vinylaromatic block copolymer, a metal chelate of the following formula:

• • (R₁O)_n M (XR₂Y)_m, where M is a metal from main group 2, 3, 4 or 5 or a transition metal;
  • R₁ is an alkyl or aryl group; n is zero or a greater whole number;
  • X and Y are oxygen or nitrogen, and may each also be attached through a double bond to R₂;
  • R₂ is an alkylene group connecting X and Y and may be branched, or else may contain oxygen or other heteroatoms in the chain; m is a whole number, but at least 1; and a tackifier resin, the adhesive film strip being detachable by extensive stretching in the direction of the bondline.

Claims

1. An adhesive for an adhesive film strip, comprising a mixture of

an acid-modified or acid anhydride-modified vinylaromatic block copolymer,

a metal chelate of the following formula:

(R₁O)_n M (XR₂Y)_m,

where

M is a metal from main group 2, 3, 4 or 5 of the periodic table of elements, or a transition metal;

R₁ is an alkyl or aryl group;

n is zero or a greater whole number;

X and Y are oxygen or nitrogen, optionally attached through a double bond to R₂;

R₂ is an alkylene group connecting X and Y and may be branched, or else may contain oxygen or other heteroatoms in the chain;

m is a whole number, but at least 1;

and a tackifier resin,

the adhesive film strip being detachable by extensive stretching in the direction of the bondline.

2. The adhesive of claim 1, wherein the vinylaromatic block copolymers possess polystyrene endblocks.

3. The adhesive of claim 1 wherein the adhesive comprises further elastomers, further acids, further acid anhydrides or combinations thereof.

4. The adhesive of claim 1, having a fraction of 20% to 70% by weight of vinylaromatic block copolymer, based on the weight of adhesive as a whole.

5. The adhesive of claim 1, comprising further blend components, selected from the group consisting of plasticizers, aging inhibitors, processing aids, fillers, dyes, optical brighteners, and stabilizers.

6. The adhesive of claim 1, wherein the metal chelates are acetylacetonates.

7. A single- or double-sided adhesive film strip comprising the adhesive of claim 1.

8. An adhesive film strip of claim 7, wherein said adhesive on at least one side of said adhesive film strip has a multilayer construction with an extensible carrier in between the layers.

9. The adhesive of claim 4, wherein said amount of vinylaromatic block copolymers is 30% to 60% by weight.

10. The adhesive of claim 9, wherein said amount of vinylaromatic block copolymers is 35% to 55% by weight.