초록 ▼

The present invention is directed to pressure-sensitive adhesive compositions and pressure-sensitive adhesive constructions fabricated using the pressure-sensitive adhesive compositions. The pressure-sensitive adhesive compositions comprise about 10 to about 40% of a styrene-isoprene block copolymer

The present invention is directed to pressure-sensitive adhesive compositions and pressure-sensitive adhesive constructions fabricated using the pressure-sensitive adhesive compositions. The pressure-sensitive adhesive compositions comprise about 10 to about 40% of a styrene-isoprene block copolymer, about 5 to about 30% of a styrene-butadiene block copolymer, about 30 to about 65% of an aromatically modified tackifying resin, about 8 to about 30% of a plasticizing oil and optionally about 0.2 to about 2% of an antioxidant, wherein the percentages are based on the total weight of the composition.

대표청구항 ▼

What is claimed is: 1. A pressure-sensitive adhesive composition comprising: a) about 10 to about 40 wt. % of a styrene-isoprene block copolymer having a styrene content of from about 14% to about 20% by weight; b) about 5 to about 30 wt. % of a styrene-butadiene block copolymer; c) about 30 to abo

What is claimed is: 1. A pressure-sensitive adhesive composition comprising: a) about 10 to about 40 wt. % of a styrene-isoprene block copolymer having a styrene content of from about 14% to about 20% by weight; b) about 5 to about 30 wt. % of a styrene-butadiene block copolymer; c) about 30 to about 65 wt. % of an aromatically modified tackifying resin; and, d) about 8 to about 30 wt. % of a plasticizing oil. 2. The adhesive composition of claim 1 further comprising about 0.2 to about 2.0 wt. % of an antioxidant. 3. The adhesive composition of claim 2 wherein said antioxidant comprises a pre-blended antioxidant in a resin carrier. 4. The adhesive composition of claim 1 wherein said styrene-isoprene block copolymer comprises from about 13 to about 27 wt. % of said composition. 5. The adhesive composition of claim 4 wherein said styrene-isoprene block copolymer comprises about 5 to about 80% by weight styrene-isoprene diblock component. 6. The adhesive composition of claim 4 wherein said styrene-isoprene block copolymer comprises about 40 to about 60% by weight styrene-isoprene diblock component. 7. The adhesive composition of claim 1 wherein said styrene-butadiene block copolymer comprises from about 8 to about 25 wt. % of said composition. 8. The adhesive composition of claim 7 wherein said styrene-butadiene block copolymer comprises from about 20 to about 35 wt. % bound styrene. 9. The adhesive composition of claim 8 wherein said styrene-butadiene block copolymer comprises from about 15 to about 20 wt. % block styrene. 10. The adhesive composition of claim 1 wherein said styrene-butadiene block copolymer comprises from about 10 to about 18 wt. % of said composition. 11. The adhesive composition of claim 10 wherein said styrene-butadiene block copolymer comprises from about 20 to about 35 wt. % bound styrene. 12. The adhesive composition of claim 11 wherein said styrene-butadiene block copolymer comprises from about 15 to about 20 wt. % block styrene. 13. The adhesive composition of claim 12 further comprising about 0.2 to about 2.0 wt. % of an antioxidant. 14. The adhesive composition of claim 1 wherein said aromatically modified tackifying resin has a softening point above about 85째 C. 15. The adhesive composition of claim 14 wherein said aromatically modified tackifying resin comprises about 6 to about 35% by weight aromatic content. 16. The adhesive composition of claim 14 wherein said aromatically modified tackifying resin has a softening point above about 90째 C. 17. The adhesive composition of claim 1 wherein said aromatically modified tackifying resin comprises about 6 to about 35% by weight aromatic content. 18. The adhesive composition of claim 1 wherein said aromatically modified tackifying resin has a softening point above about 90째 C. 19. The adhesive composition of claim 1 wherein said aromatically modified tackifying resin comprises about 40 to about 52 wt. % of said composition. 20. The adhesive composition of claim 19 wherein said aromatically modified tackifying resin comprises about 6 to about 35% by weight aromatic content. 21. The adhesive composition of claim 19 wherein said aromatically modified tackifying resin has a softening point above about 85째 C. 22. The adhesive composition of claim 21 further comprising about 0.2 to about 2.0 wt. % of an antioxidant. 23. The adhesive composition of claim 1 wherein said plasticizing oil comprises about 16 to about 22 wt. % of said composition. 24. The adhesive composition of claim 1 wherein said composition expresses a single glass transition temperature. 25. The adhesive composition of claim 1 wherein said adhesive composition has a tangent δ value of greater than 0.5 at all temperatures in the range of about-20째 C. to about 100째 C. 26. The adhesive composition of claim 1 wherein said composition has a composite midblock glass transition temperature of about 258 Kelvin to about 288 Kelvin. 27. The adhesive composition of claim 26 wherein said composition has a composite midblock glass transition temperature of about 263 Kelvin to about 283 Kelvin. 28. The adhesive composition of claim 26 wherein said composition has a composite midblock glass transition temperature of about 268 Kelvin to about 282 Kelvin. 29. The adhesive composition of claim 1 wherein said composition has a loop tack adhesion value to high density polyethylene greater than about 0.5 psi at 35째 F. 30. The adhesive composition of claim 1 wherein said composition has a loop tack adhesion value to high density polyethylene greater than about 2.5 psi at 70째 F. 31. The adhesive composition of claim 1 wherein said composition has a loop tack adhesion value to corrugated paperboard greater than about 0.3 psi at 35째 F. 32. The adhesive composition of claim 1 wherein said composition has a loop tack adhesion value to corrugated paperboard greater than about 1.5 psi at 70째 F. 33. A pressure-sensitive adhesive composition comprising: a) about 10 to about 40 wt. % of a styrene-isoprene block copolymer having about 5 to about 80% by weight styrene-isoprene diblock component having a styrene content of from about 14% to about 20% by weight; b) about 5 to about 30 wt. % of a styrene-butadiene block copolymer having from about 20 to about 35 wt. % bound styrene and about 15 to about 20 wt. % block styrene; c) about 30 to about 65 wt. % of an aromatically modified tackifying resin having between about 6 to about 35% aromatic content and a softening point above about 85째 C.; and d) about 8 to about 30 wt. % of a plasticizing oil, wherein said composition expresses a single glass transition temperature and has a tangent δ value of greater than about 0.5 for all temperatures in the range of about-20째 C. to about 100째 C. 34. The adhesive composition according to claim 33 wherein said styrene-isoprene block copolymer comprises about 13 to about 27 wt. % of said composition. 35. The adhesive composition according to claim 33 wherein said styrene-isoprene block copolymer comprises about 14 to about 22 wt. % of said composition. 36. The adhesive composition according to claim 33 wherein said styrene-butadiene block copolymer comprises about 8 to about 25 wt. %of said composition. 37. The adhesive composition according to claim 33 wherein said styrene-butadiene block copolymer comprises about 10 to about 18 wt. % of said composition. 38. The adhesive composition according to claim 33 wherein said aromatically modified tackifying resin comprises about 40 to about 52 wt. % of said composition. 39. The adhesive composition according to claim 33 wherein said aromatically modified tackifying resin comprises about 45 to about 52 wt. % of said composition. 40. The adhesive composition according to claim 33 wherein said composition has a composite midblock glass transition temperature of about 258 Kelvin to about 288 Kelvin. 41. The adhesive composition according to claim 40 wherein said composition has a composite midblock glass transition temperature of about 263 Kelvin to about 283 Kelvin. 42. The adhesive composition according to claim 40 wherein said composition has a composite midblock glass transition temperature of about 268 Kelvin to about 282 Kelvin. 43. The adhesive composition according to claim 33 further comprising about 0.2 to about 2.0 wt. % of an antioxidant. 44. A pressure-sensitive adhesive construction comprising: a) a face stock; and b) a pressure-sensitive adhesive layer coated on at least one surface of said face stock, said pressure-sensitive adhesive comprising: i) about 10 to about 40 wt. % of a styrene-isoprene block copolymer having a styrene content of from about 14% to about 20% by weight; ii) about 5 to about 30 wt. % of a styrene-butadiene block copolymer; iii) about 30 to about 65 wt. % of an aromatically modified tackifying resin; and, iv) about 8 to about 30 wt. % of a plasticizing oil. 45. The pressure-sensitive adhesive construction of claim 44 further comprising a release layer in contact with said pressure-sensitive adhesive layer. 46. The pressure-sensitive adhesive construction of claim 44 wherein said styrene-isoprene block copolymer comprises about 40 to about 60 wt. % by weight styrene-isoprene diblock component. 47. The pressure-sensitive adhesive construction of claim 44 wherein said aromatically modified tackifying resin has a softening point of greater than about 85째 C. 48. The pressure-sensitive adhesive construction of claim 44 wherein said aromatically modified tackifying resin has a softening point of greater than about 90째 C. 49. The pressure-sensitive adhesive construction of claim 44 wherein said aromatically modified tackifying resin has between from about 6% to about 35% by weight aromatic content. 50. The pressure-sensitive adhesive construction of claim 44 wherein said pressure-sensitive adhesive comprises: i) about 10 to about 40 wt. % of a styrene-isoprene block copolymer having about 5 to about 80% by weight styrene-isoprene diblock component; ii) about 5 to about 30 wt. % of a styrene-butadiene block copolymer having from about 20 to about 35 wt. % bound styrene and about 15 to about 20 wt. % block styrene; iii) about 30 to about 65 wt. % of an aromatically modified tackifying resin having between about 6 to about 35% aromatic content and a softening point above about 85째 C.; iv) about 8 to about 30 wt. % of a plasticizing oil, and v) about 0.2 to about 2.0 wt. % of an antioxidant, wherein said pressure-sensitive adhesive expresses a single glass transition temperature and has a tangent δ value of greater than about 0.5 for all temperatures in the range of about-20째 C. to about 100째 C. 51. The pressure-sensitive adhesive construction of claim 50 further comprising a release layer in contact with said pressure-sensitive adhesive layer. 52. The pressure-sensitive adhesive construction of claim 50 wherein said styrene-isoprene block copolymer comprises about 40 to about 60% by weight styrene-isoprene diblock component. 53. The pressure-sensitive adhesive construction of claim 50 wherein said styrene-isoprene block copolymer comprises about 50 to about 58% by weight styrene-isoprene diblock component. 54. The pressure-sensitive adhesive construction of claim 50 wherein said aromatically modified tackifying resin has a softening point of greater than about 85째 C. 55. The pressure-sensitive adhesive construction of claim 50 wherein said aromatically modified tackifying resin has a softening point of greater than about 90째 C.