Heat-activatable single-sided self-adhesive tape and its use

• US 6,632,498 B1
• Filed: 08/10/1999
• Issued: 10/14/2003
• Est. Priority Date: 08/17/1998
• Status: Expired due to Fees

• Current Assignee: Tesa SE (maxingvest GmbH & Co. KGaA)
• Original Assignee: Tesa AG (maxingvest GmbH & Co. KGaA)
• Inventors: Kehler, Harald, Zimmermann, Dieter, Schulze, Walter
• Primary Examiner(s): Ahmad, Nasser
• Application Number:
  US09/371,393
• Time in Patent Office: 1,526 Days
• Field of Search: 428/40.1, 428/424.6, 428/41.2, 428/41.5, 428/41.7, 428/41.8, 428/41.9, 428/355, 428/346, 428/347, 428/349, 428/354, 156/310, 156/313
• US Class Current: 428/40.1
• CPC Class Codes: C08L 33/06 of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
• CPC Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• CPC Class Codes: C09J 2301/122 the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
• CPC Class Codes: C09J 2301/208 the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
• CPC Class Codes: C09J 2301/304 the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
• 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 2433/00 Presence of (meth)acrylic polymer
• CPC Class Codes: C09J 7/35 Heat-activated
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/1448 Coloring agent containing
• CPC Class Codes: Y10T 428/1462 Polymer derived from material having at least one acrylic or alkacrylic group or the nitrile or amide derivative thereof [e.g., acrylamide, acrylate ester, etc.]
• CPC Class Codes: Y10T 428/1471 Protective layer
• CPC Class Codes: Y10T 428/1476 Release layer
• CPC Class Codes: Y10T 428/1481 Dissimilar adhesives
• CPC Class Codes: Y10T 428/2813 Heat or solvent activated or sealable
• CPC Class Codes: Y10T 428/2817 Heat sealable
• CPC Class Codes: Y10T 428/2826 Synthetic resin or polymer
• CPC Class Codes: Y10T 428/2848 Three or more layers

Abstract

Heat-activatable single-sided self-adhesive tape, characterized by

a) a heat-activatable double-sided adhesive film strip based on thermoplastic rubber, tackifier resin and reactive resin,

b) a double-sided self-adhesive tape laminated onto one side of the said strip, and

c) if desired, release paper or a release film on one side of the adhesive tape.

Claims

1. A heat-activatable single-sided self-adhesive tape comprising:

a) a heat-activatable double-sided adhesive film strip comprising an adhesive composition based on thermoplastic rubber, tackifier resin and reactive resin;

b) a double-sided self-adhesive tape laminated onto one side of said adhesive film strip; and

c) optionally, a release paper or a release film adhered to one side of said double-sided self-adhesive tape.

2. The heat-activatable single-sided self-adhesive tape according to claim 1, wherein the adhesive film strip comprises an adhesive composition based on thermoplastic rubber, tackifier resins and an admixed reactive resin, and wherein the adhesive film strip exhibits an adhesion lower than its cohesion, the adhesion of the adhesive film strip largely disappears when the adhesive film strip is extended, the adhesive film strip exhibits a ratio of peel strength to tensile strength of 1:

1.5 or more, and the adhesive film strip can be detached from a substrate to which the adhesive film strip is bonded by pulling on the adhesive film strip in a direction of a plane of a bond formed between said adhesive film strip and said substrate.

3. The heat-activatable single-sided self-adhesive tape according to claim 1, wherein the reactive resin is a heat-activatable resin.

4. The heat-activatable single-sided self-adhesive tape according to claim 1, wherein the reactive resin makes up from 10 to 30% of the total weight of the adhesive composition of the adhesive film strip.

5. The heat-activatable single-sided self-adhesive tape according to claim 4, wherein the reactive resin makes up from 15 to 25% of the total weight of the adhesive composition of the adhesive film strip.

6. The heat-activatable single-sided self-adhesive tape according to claim 1, wherein the reactive resin is employed together with a metal oxide.

7. The heat-activatable single-sided self-adhesive tape according to claim 6, wherein the metal oxide is magnesium oxide.

8. The heat-activatable single-sided self-adhesive tape according to claim 6, wherein the metal oxide makes up from 1 to 3% of the total weight of the adhesive composition of the adhesive film strip.

9. The heat-activatable single-sided self-adhesive tape according to claim 8, wherein the metal oxide makes up from 1.5 to 2.5% of the total weight of the adhesive composition of the adhesive film strip.

10. The heat-activatable single-sided self-adhesive tape according to claim 1, wherein the thermoplastic rubber in the adhesive composition of the adhesive film strip is a styrene-butadiene block polymer, and the tackifier resin in the adhesive composition of the adhesive film strip is a rosin derivative.

11. The heat-activatable single-sided self-adhesive tape according to claim 1, wherein the double-sided adhesive tape which is laminated onto one side of the adhesive film strip is a pressure-sensitive adhesive tape comprising an acrylate-based adhesive composition.

12. The heat-activatable single-sided self-adhesive tape according to claim 1, wherein the adhesive film strip is from 0.4 to 0.8 mm thick, and the double-sided adhesive tape which is laminated onto one side of the adhesive film strip is from 0.02 to 0.1 mm thick.

13. A method of bonding an EPDM part to a substrate comprising:

a) providing a heat-activatable single-sided self-adhesive tape according to any one of claims 1-12;

b) bonding the adhesive film strip under the action of heat to the EPDM part; and

c) bonding the double-sided adhesive tape which is laminated onto one side of the adhesive film strip to the substrate.

14. The method according to claim 13, wherein the substrate is a motor vehicle door frame.

15. A heat-activatable single-sided self-adhesive tape comprising:

a) a heat-activatable double-sided adhesive film strip comprising an adhesive composition based on thermoplastic rubber, tackifier resin and a heat-activatable alkylphenol reactive resin;

b) a double-sided self-adhesive tape laminated onto one side of said adhesive film strip; and

c) optionally, a release paper or a release film adhered to one side of said double-sided self-adhesive tape.

16. The heat-activatable single-sided self-adhesive tape according to claim 15, wherein the adhesive film strip exhibits an adhesion lower than its cohesion, the adhesion of the adhesive film strip largely disappears when the adhesive film strip is extended, the adhesive film strip exhibits a ratio of peel strength to tensile strength of 1:

1.5 or more, and the adhesive film strip can be detached from a substrate to which the adhesive film strip is bonded by pulling on the adhesive film strip in a direction of a plane of a bond formed between said adhesive film strip and said substrate.

17. The heat-activatable single-sided self-adhesive tape according to claim 15, wherein the reactive resin makes up from 10 to 30% of the total weight of the adhesive composition of the adhesive film strip.

18. The heat-activatable single-sided self-adhesive tape according to claim 17, wherein the reactive resin makes up from 15 to 25% of the total weight of the adhesive composition of the adhesive film strip.

19. The heat-activatable single-sided self-adhesive tape according to claim 15, wherein the reactive resin is employed together with a metal oxide.

20. The heat-activatable single-sided self-adhesive tape according to claim 19, wherein the metal oxide is magnesium oxide.

21. The heat-activatable single-sided self-adhesive tape according to claim 19, wherein the metal oxide makes up from 1 to 3% of the total weight of the adhesive composition of the adhesive film strip.

22. The heat-activatable single-sided self-adhesive tape according to claim 21, wherein the metal oxide makes up from 1.5 to 2.5% of the total weight of the adhesive composition of the adhesive film strip.

23. The heat-activatable single-sided self-adhesive tape according to claim 15, wherein the thermoplastic rubber in the adhesive composition of the adhesive film strip is a styrene-butadiene block polymer, and the tackifier resin in the adhesive composition of the adhesive film strip is a rosin derivative.

24. The heat-activatable single-sided self-adhesive tape according to claim 15, wherein the double-sided adhesive tape which is laminated onto one side of the adhesive film strip is a pressure-sensitive adhesive tape comprising an acrylate-based adhesive composition.

25. The heat-activatable single-sided self-adhesive tape according to claim 15, wherein the adhesive film strip is from 0.4 to 0.8 mm thick, and the double-sided adhesive tape which is laminated onto one side of the adhesive film strip is from 0.02 to 0.1 mm thick.

26. A method of bonding an EPDM part to a substrate comprising:

a) providing a heat-activatable single-sided self-adhesive tape according to any one of claims 15-25;

b) bonding the adhesive film strip under the action of heat to the EPDM part; and

c) bonding the double-sided adhesive tape which is laminated onto one side of the adhesive film strip to the substrate.

27. The method according to claim 26, wherein the substrate is a motor vehicle door frame.