Adhesives

• US 6,992,131 B2
• Filed: 02/21/2003
• Issued: 01/31/2006
• Est. Priority Date: 03/22/2002
• Status: Expired due to Fees

• Current Assignee: ExxonMobil Chemical Patents Inc. (Exxon Mobil Corporation)
• Original Assignee: ExxonMobil Chemical Patents Inc. (Exxon Mobil Corporation)
• Inventors: Sims, Charles Lewis, Faissat, Michel L., Karandinos, Anthony George
• Primary Examiner(s): Mulcahy, Peter D.
• Application Number:
  US10/370,695
• Publication Number:
  US 20030181554A1
• Time in Patent Office: 1,075 Days
• Field of Search: 524/474, 524/528
• US Class Current: 524/528
• CPC Class Codes: C08L 23/0815 Copolymers of ethene with aliphatic 1-olefins
• CPC Class Codes: C08L 23/12 Polypropene
• CPC Class Codes: C08L 23/20 having four to nine carbon atoms
• CPC Class Codes: C08L 2666/06 Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
• CPC Class Codes: C08L 57/00 Compositions of unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09J 123/12 Polypropene
• CPC Class Codes: C09J 123/20 having four to nine carbon atoms

Abstract

This invention relates to an adhesive including (a) a copolymer including butene, at least 40 mol % propylene, and from 0 to 30 mol % of a termonomer selected from ethylene and C₅ to C₂₀ linear, branched or cyclic alpha olefins, wherein the copolymer has (i) a weight average molecular weight of 100,000 or less; (ii) a number average molecular weight of 20,000 or less; (iii) an Mw/Mn of 5 or more; and (iv) a viscosity of 8000 mPa.sec or less at 190° C.; and (b) a hydrocarbon resin, and/or (c) a polypropylene having at least 30% crystallinity having a viscosity of 1500 mPa.s or less at 190° C., or a tactic polypropylene having a viscosity of 1500 mPa.s or less at 190° C., provided that if the tactic polypropylene is not present, then the hydrocarbon resin is a cyclopentadiene-based hydrocarbon resin. This invention also relates to blends of the copolymer described above and isotactic polypropylene without hydrocarbon resin.

Claims

1. An adhesive comprising:

(a) a copolymer comprising butene, at least 40 mol % propylene, and from 0 to 30 mol % of a termonomer selected from the group consisting of ethylene and C₅ to C₂₀ linear, branched or cyclic alpha olefins, wherein the copolymer has

(i) a weight average molecular weight of 100,000 or less;

(ii) a number average molecular weight of 20,000 or less;

(iii) an Mw/Mn of 5 or more; and

(iv) a viscosity of 8000 mPa.s or less at 190°

C.;

(b) a hydrocarbon resin; and

(c) a polypropylene that is not tactic and has at least 30% crystallinity having a viscosity of 1500 mPa.s or less at 190°

C. or a polypropylene that is tactic and has a viscosity of 1500 mPa.s or less at 190°

C. provided that if the tactic polypropylene is not present, then the hydrocarbon resin comprises a cyclopentadiene-based hydrocarbon resin.

2. The adhesive of claim 1, wherein the copolymer has a viscosity of 7000 mPa.s or less at 190°

C.

3. The adhesive of claim 1, wherein the copolymer has a viscosity of 5000 mPa.s or less at 190°

C.

4. The adhesive of claim 1, wherein the polypropylene is present and has a viscosity of 1000 mPa.s or less at 190°

C.

5. The adhesive of claim 1, wherein the adhesive has a viscosity of 5000 mPa.s or less at 190°

C.

6. The adhesive of claim 1, wherein the adhesive has a viscosity of 4000 mPa.s or less at 190°

C.

7. The adhesive of claim 1, wherein the adhesive has a viscosity of 3000 mPa.s or less at 190°

C.

8. The adhesive of claim 1, wherein the adhesive has a viscosity of 2000 mPa.s or less at 190°

C.

9. The adhesive of claim 1, wherein the adhesive has a viscosity of 1000 mPa.s or less at 190°

C.

10. The adhesive of claim 1, wherein the termonomer comprises 0.5 to 15 mol % of one or more of ethylene, butane, pentene, hexene, heptene, octane, nonene, decene, undecene, dodecene, 3,5,5-trimethyl-1-hexene, 3-methyl-1-pentene, hexadiene, decadiene, dodecadiene, hexadecadiene, vinyl norbornene, and 4-methyl-1-pentene.

11. The adhesive of any one of claim 1, wherein the propylene is present in the copolymer at 40 to 90 mol %, the butene is present in the copolymer at 10 to 60 mol %, and the termonomer is present in the copolymer at 0 to 10 mole %.

12. The adhesive of claim 1, wherein the propylene is present in the copolymer at 60 to 70 mol %, the butane is present in the copolymer at 30 to 40 mol %, and the termonomer is present in the copolymer at 0.5 to 4 mol %.

13. The adhesive of claim 1, wherein the copolymer has a weight average molecular weight of 20,000 to 70,000.

14. The adhesive of claim 1, wherein the copolymer has an Mw/Mn of 5 to 10.

15. The adhesive of claim 1, wherein the copolymer has an Mw/Mn of 6 to 10.

16. The adhesive of claim 1, wherein the copolymer has an Mw/Mn of 7 to 10.

17. The adhesive of claim 1, wherein the copolymer has a weight average molecular weight of 20,000 to 70,000;

an Mw/Mn of 6 to 10;

a crystallinity of 30% or less; and

a Tg of −

5°

C. or less.

18. The adhesive of claim 1, wherein the tactic polypropylene is present and comprises syndiotactic polypropylene having a viscosity of less than 1000 mPa.s at 190°

C. and is present at up to 50 weight % based upon the weight of the copolymer and the polypropylene.

19. The adhesive of claim 1, wherein the polypropylene having a crystallinity of 30% or more is present and has a crystallinity of 40% or more.

20. The adhesive of claim 1, wherein the polypropylene having a crystallinity of 30% or more is present and has a crystallinity of 50% or more.

21. The adhesive of claim 1, wherein the tactic polypropylene is present and comprises isotactic polypropylene having a Tm of 150°

C. or less.

22. The adhesive of claim 1, wherein the tactic polypropylene is present and comprises isotactic polypropylene having a Tm of 130°

C. or less.

23. The adhesive of claim 1, wherein the tactic polypropylene is present and comprises isotactic polypropylene having a Tm of 120°

C. or less.

24. The adhesive of claim 1, wherein the hydrocarbon resin is present and comprises a cyclopentadiene-based hydrocarbon resin which comprises the product of the thermal polymerization of a monomer stream comprising cyclopentadiene and dimers, trimers, tetramers or oligomers thereof.

25. The adhesive of claim 24, wherein the monomer stream further comprises from about 2 to 14 weight % of aromatic monomers, based upon the weight of the monomer stream.

26. The adhesive of claim 25, wherein the aromatic monomers are present at 4 to 10 weight %, based upon the weight of the monomer stream.

27. The adhesive of claims 25, wherein the aromatic monomers comprise one or more of styrene, alpha-methyl styrene and indene.

28. The adhesive of claim 24, wherein the cyclopentediene-based hydrocarbon resin has been hydrogenated.

29. The adhesive of claim 1, wherein the hydrocarbon resin is present and comprises aromatic modified hydrogenated polycyclopentadiene resin.

30. The adhesive of claim 1, wherein the copolymer and the polypropylene are present at 50 weight % or more, based upon the weight of the copolymer, the polypropylene and the resin.

31. The adhesive of claim 30 wherein the copolymer and the polypropylene are present at up to 75 weight %, based upon the weight of the copolymer, the polypropylene and the resin.

32. The adhesive of claim 30, wherein the copolymer and the tactic polypropylene are present at up to 85 weight %, based upon the weight of the copolymer, the polypropylene and the resin.

33. The adhesive of claim 30, wherein the copolymer and the polypropylene are present at up to 90 weight %, based upon the weight of the copolymer, the polypropylene and the resin.

34. The adhesive of claim 1, further comprising additional tackifier selected from the group consisting of aliphatic hydrocarbon resins, aromatic modified aliphatic hydrocarbon resins, hydrogenated polycyclopentadiene resins, polycyclopentadiene resins, gum rosins, gum rosin esters, wood roams, wood rosin esters, tall oil rosins, tall oil rosin esters, polyterpenes, aromatic modified polyterpenes, terpene phenolics, aromatic modified hydrogenated polycyclopentadiene resins, hydrogenated aliphatic resins, hydrogenated aliphatic aromatic resins, hydrogenated terpenes and modified terpenes, hydrogenated rosin esters, and mixtures thereof.

35. The adhesive of claim 1, wherein the tactic polypropylene is present, comprises isotactic polypropylene, and is present at up to 50 weight % based upon the weight of the copolymer and the polypropylene, and the hydrocarbon resin is selected from the group consisting of aliphatic hydrocarbon resins, aromatic modified aliphatic hydrocarbon resins, hydrogenated polycyclopentadiene resins, polycyclopentadiene resins, gum rosins, gum rosin esters, wood roams, wood rosin esters, tall oil rosins, tall oil rosin esters, polyterpenes, aromatic modified polyterpenes, terpene phenolics, aromatic modified hydrogenated polycyclopentadiene resins, hydrogenated aliphatic resins, hydrogenated aliphatic aromatic resins, hydrogenated terpenes and modified terpenes, hydrogenated rosin esters, and mixtures thereof.

36. The adhesive of any one of claim 1, wherein the polypropylene is isotactic polypropylene having a viscosity of less than 1000 mPa.s at 190°

C. and is present at up to 50 weight % based upon the weight of the copolymer and the polypropylene, and the hydrocarbon resin comprises a cyclopentadiene-based hydrocarbon resin arid a tackifier selected from the group consisting of aliphatic hydrocarbon resins, aromatic modified aliphatic hydrocarbon resins, hydrogenated polycyclopentadiene resins, polycyclopentadiene resins, gum rosins, gum rosin esters, wood rosins, wood rosin esters, tall oil resins, tall oil rosin esters, polyterpenes, aromatic modified polyterpenes, terpene phenolics, aromatic modified hydrogenated polycyclopentadiene resins, hydrogenated aliphatic resins, hydrogenated aliphatic aromatic resins, hydrogenated terpenes and modified terpenes, hydrogenated rosin esters, and mixtures thereof.

37. A diaper comprising the adhesive of claim 1.

38. A hot melt adhesive comprising the adhesive of claim 1.

39. An adhesive comprising:

(a) a copolymer comprising butene and at least 40 mol % propylene, wherein the copolymer has

(i) a weight average molecular weight of 100,000 or less;

(ii) a number average molecular weight of 20,000 or less;

(iii) an Mw/Mn of 5 or more; and

(iv) a viscosity of 8000 mPa.sec or less at 190°

C.;

(b) a cyclopentadiene-based hydrocarbon resin; and

(c) a polypropylene having at least 30% crystallinity having a viscosity of 1500 mPa.s or less at 190°

C.

40. The adhesive of claim 39, wherein the copolymer has a weight average molecular weight of 20,000 to 70,000;

an Mw/Mn of 6 to 10;

a crystallinity of 30% or less; and

a Tg of −

5°

C. or less.

41. The adhesive of claim 39, further comprising a termonomer in an amount of less than 30 mol %, wherein the termonomer comprises about 0.5 to about 15 mol % of one or more of ethylene, butene, pentene, hexene, heptene, octene, nonene, decene, undecene, dodecene, 3,5,5-trimethyl-1-hexene, 3-methyl-1-pentene, hexadiene, decadiene, dodecadiene, and 4-methyl-1-pentene.

42. The adhesive of claims 39, wherein the propylene is present in the copolymer in an amount of 40 to 90 mol % and the butene is present in the copolymer in an amount of 10 to 60 mol %.

43. The adhesive of claim 41, wherein the propylene is present in the copolymer in an amount of 60 to 70 mol %, the butene is present in the copolymer in an amount of 30 to 40 mol %, and the termonomer is present in the copolymer at 0.5 to 4 mol %.

44. The adhesive of claim 39, wherein the cyclopentadiene-based hydrocarbon resin comprises the product of the thermal polymerization of a monomer stream comprising cyclopentadiene and dimers, trimers, tetramers or oligomers thereof.

45. The adhesive of claim 44, wherein the monomer stream further comprises from about 2 to 14 weight % of aromatic monomers, based upon the weight of the monomer stream.

46. The adhesive of claim 39, wherein the hydrocarbon resin comprises aromatic modified hydrogenated polycyclopentadiene resin.

47. The adhesive of claim 39, wherein the copolymer and the polypropylene, are present at 50 weight % or more, based upon the weight of the copolymer, the polypropylene and the hydrocarbon resin.