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1. (WO1993017079) COMPOSITION ADHESIVE SENSIBLE A LA PRESSION, A FORTE RESISTANCE AU DECHIREMENT
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

WHAT IS CLAIMED IS:
1. A normally tacky pressure-sensitive adhesive composition comprising (1) a radial teleblock copolymer having at least three monoalkenyl arene polymer blocks and a branched elastomeric conjugated diene polymer block, (2) a tackifying resin, and (3) from about 5 to about 20 parts by weight extending oil per hundred parts by weight of radial copolymer.

2. A normally tacky pressure-sensitive adhesive composition comprising:
(a) a radial teleblock copolymer of the formula: (A-B)n-Z
wherein
A represents a monoalkenyl arene polymer
block linked to an elastomeric
conjugated diene polymer block,
B represents an elastomeric conjugated
diene polymer block,
n represents an integer equal to or
greater than 3,
Z represents a multifunctional linking
agent;
(b) a tackifying resin; and
(c) an extending oil in an amount of 5 to 20 parts by weight per hundred parts by weight of said copolymer.

3. The composition of Claim 2 , wherein said monoalkenyl arene polymer blocks of said copolymer comprise polystyrene blocks.

4. The composition of Claim 3, wherein said polystyrene blocks have a molecular weight of from about 11,000 to about 13,000.

5. The composition of Claim 2 , wherein said monoalkenyl arene polymer blocks comprise from about 17 to about 23% by weight of said copolymer.

6. The composition of Claim 2, wherein said elastomeric conjugated diene polymer blocks comprise from about 83 to about 77% by weight of said copolymer.

7. The composition of Claim 2, wherein said elastomeric conjugated diene polymer blocks of said copolymer comprise polyisoprene blocks.

8. The composition of Claim 2 , wherein Z represents the residue of a coupling agent.

9. The composition of Claim 2, wherein Z represents the residue of an initiator.

10. The composition of Claim 2, wherein the molecular weight of said copolymer ranges from about

180,000 to about 250,000.

11. The composition of Claim 2, wherein the load-bearing capacity of said copolymer is at least 85%.

12. The composition of Claim 2, wherein said tackifying resin has a ring-and-ball softening point of from about 80°C to about 135°C.

13. The composition of Claim 2, wherein said tackifying resin is present in an amount of from about 25 parts to about 200 parts by weight per hundred parts by weight of said copolymer.

14. The composition of Claim 2, wherein said tackifying resin is present in an amount of from about 80 parts to about 120 parts by weight per hundred parts by weight of said copolymer.

15. The composition of Claim 2, wherein the aromatic content of said extending oil comprises no more than 15% by weight of said oil.

16. The composition of Claim 2, wherein the aromatic content of said extending oil comprises no more than 5% by weight of said oil.

17. The composition of Claim 2, wherein said extending oil is present in an amount of 6 to 12 parts by weight per hundred parts by weight of said
copolymer.

18. The composition of Claim 2, wherein said composition is hot-melt coatable.

19. The composition of Claim 2, wherein said monoalkenyl arene polymer blocks comprise from about 17 to about 23% by weight of said copolymer and the molecular weight of said copolymer ranges from about 180,000 to about 250,000.

20. The composition of Claim 2, wherein n represents the integer 3.

21. The composition of Claim 2, wherein n represents the integer 4.

22. An article comprising a substrate having on at least one major surface thereof a layer of the composition of Claim 2.

23. A tape comprising a backing having on at least one major surface thereof a layer of the
composition of Claim 2.

24. The tape of Claim 23 wherein said backing is made of paper.

25. The tape of Claim 23 wherein said backing is made of a polymeric material.

26. The tape of Claim 23 wherein said backing is made of biaxially oriented polypropylene film.