Pressure-sensitive adhesive mass and the use thereof

• US 6,984,428 B2
• Filed: 11/02/2001
• Issued: 01/10/2006
• Est. Priority Date: 11/10/2000
• Status: Expired due to Term

• Current Assignee: Tesa SE (maxingvest GmbH & Co. KGaA)
• Original Assignee: Tesa AG (maxingvest GmbH & Co. KGaA)
• Inventors: Krawinkel, Thorsten, Lühmann, Bernd, Franck, Kerstin
• Primary Examiner(s): Szekely, Peter
• Application Number:
  US10/450,305
• Publication Number:
  US 20040110882A1
• Time in Patent Office: 1,530 Days
• Field of Search: 524/111, 524303-304, 524349-350, 428/41.3, 428/354, 428/355.RA, 428/355.EN, 428/355.BL
• US Class Current: 428/41.3
• CPC Class Codes: C09J 11/00 Features of adhesives not provided for in group C09J9/00, e.g. additives
• CPC Class Codes: C09J 11/06 organic
• CPC Class Codes: Y10T 428/1452 Polymer derived only from ethylenically unsaturated monomer
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/2861 having readily strippable combined with readily readhearable properties [e.g., stick-ons, etc.]
• CPC Class Codes: Y10T 428/2878 including addition polymer from unsaturated monomer
• CPC Class Codes: Y10T 428/2883 including addition polymer of diene monomer [e.g., SBR, SIS, etc.]

Abstract

Pressure sensitive adhesive strip which is detachable without destruction and without leaving a residue.

Claims

1. A single-sidedly or double-sidedly adhesive sheet strip redetachable by stretching in the bond plane, having a pressure-sensitive adhesive comprised of

a) block copolymer

b) tackifier resins,

c) a primary antioxidant selected from the group consisting of sterically hindered phenols

and an additive selected from the group consisting of

d) sterically hindered monocyclic and polycyclic phenol containing a benzyl thioether group positioned ortho, and/or para to the phenolic OH group,

e) sterically hindered phenols which carry an acrylic acid phenyl ester group positioned ortho, para or ortho and para to the phenolic OH group,

f) sterically hindered lactones, and combinations thereof.

2. The adhesive sheet strip of claim 1, wherein the monocyclic and/or polycyclic phenol d) is 4,6-bis(alkylthiomethyl)-o-cresol.

3. The adhesive sheet strip of claim 1, wherein the phenol e) is 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylbenzyl)-4-methoxyphenyl acrylate or 2-[1 -(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl acrylate.

4. The adhesive sheet strip of claim 1, wherein the lactone f) is a substituted compound with the 3-phenyl-3H-benzofuran-2-one parent structure.

5. The adhesive sheet strip of claim 1, wherein components d), e) and f) are present in total in an amount of 0.01 to 3.0 parts by weight based on 100 parts by weight of the overall pressure sensitive adhesive.

6. The adhesive sheet strip of claim 1, wherein the block copolymer a) is present in an amount of 30 to 65, the tackifier resin b) from 35 to 70, and the antioxidant c) from 0 to 2.5, all in parts by weight based on 100 parts by weight of the overall pressure sensitive adhesive.

7. The adhesive sheet strip of claim 1, wherein the block copolymer a) comprises polymer blocks formed from vinyl aromatics (A blocks), and those formed by polymerization of 1,3-dienes (D blocks).

8. The adhesive sheet strip of claim 1, wherein the antioxidant c) is a primary antioxidant a secondary antioxidant or a combination of a primary antioxidant and a secondary antioxidant.

9. The adhesive sheet strip of claim 4, wherein said lactone is the reaction product of 3-hydroxy-5,7-di-tert-butyl-furan-2-one with o-xylene.

10. The adhesive sheet strip of claim 1, wherein the total amount of components d), e) and f) is 0.02 to 1.0 parts by weight based on 100 parts by weight of the overall pressure sensitive adhesive.

11. The adhesive sheet strip of claim 7, wherein said vinyl aromatics are styrene and said 1,3-dienes are butadiene and/or isoprene and/or hydrogenation products thereof.

12. The adhesive sheet strip of claim 8, wherein said antioxidant is a sterically hindered phenol containing a 3-(p-hydroxyphenyl)propionic acid group or a (3-(o-hydroxyphenyl)propionic acid group.

13. The adhesive sheet strip of claim 1, comprising further additives selected from the group consisting of light stabilizers, antiozonants, metal deactivators, processing assistants, endblock-reinforcing resins, plasticizing agents, fillers, color pigments, dyes and optical brighteners.

14. The adhesive sheet strip of claim 2, wherein the monocyclic and/or polycyclic phenol d) is 4,6-bis(octylthiomethyl)-o-cresol or 4,6-bis(dodecylthiomethyl)-o-cresol.