IP Library › Granted Patent US 8,501,308
Granted Patent B2
US 8,501,308 · App. 11/403,457 · Granted Aug 6, 2013

Grafted cyclodextrin

Inventors: Willard E. Wood (Arden Hills, MN); Neil J. Beaverson (Vadnais Heights, MN); Kasyap V. Seethamraju (Eden Prairie, MN)
Assignee: Cellresin Technologies, LLC
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Quick Facts
Patent No.
US 8,501,308
App. No.
11/403,457
Granted
Aug 6, 2013
Kind
B2
Abstract

Thermoplastic polymer compositions, films, continues, closures, laminates can comprise a modified vinyl polymer said modified polymer having a moiety comprising a cyclodextrin compound. The cyclodextrin compound, locked into the polymer structure, can absorb impurities, permeants, or other undesirable volatile materials. The cooperation between the cyclodextrin grafted onto the thermoplastic polymer and the polymer structure can provide barrier properties to a film, web or other polymer structure. A permeant or a contaminant can be complexed or trapped within the polymer and held within the film or Web preventing the permeant or contaminant from passing into the interior of a container or enclosure.

Claims (54)

1. A container comprising an enclosed volume, the volume surrounded by a polyolefin web, the web comprising a blend of a polyolefin resin and a modified polyolefin resin, the modified polyolefin resin comprising a polymethylene backbone having randomly substituted covalently bonded groups derived from a cyclodextrin compound, the web comprising about 100 parts by weight of the polyolefin resin and about 0.01 to 10 parts by weight of the modified polyolefin; wherein the cyclodextrin compound is substantially free of a compound in the central pore of the cyclodextrin ring.

2. The container of claim 1 wherein the web comprises a laminate comprising a paperboard layer and a bonded polyolefin layer.

3. The container of claim 1 wherein the volume enclosed by the web is filled with a liquid food.

4. The container of claim 3 wherein web has a capacity of about 100 mL to 3 liters and the liquid food comprises a citrus juice.

5. The container of claim 1 wherein the polyolefin comprises a polyolefin having melt index of about 0.5 to 100 g-10 min −1 .

6. The container of claim 1 wherein the polyolefin comprises a polyolefin having a melt index of about 0.7 to 200 g-10 min −1 .

7. The container of claim 1 wherein the polyolefin comprises a polyethylene chip.

8. The container of claim 1 wherein the modified polyolefin comprises a modified polyethylene.

9. The container of claim 1 wherein the polyolefin comprises a polypropylene.

10. The container of claim 1 wherein the modified polyolefin comprises a modified polypropylene.

11. The container of claim 1 wherein the polyolefin comprises a poly(ethylene-co-propylene).

12. The container of claim 1 wherein the modified polyolefin comprises a modified poly(ethylene-co-propylene).

13. The container of claim 1 wherein the modified polyolefin comprises a cyclodextrin bonded to a maleic acid modified polyolefin wherein the polyolefin comprises about 0.05 to 2 weight percent maleic anhydride.

14. The container of claim 1 wherein the modified polyolefin comprises a cyclodextrin bonded to a maleic acid modified polyolefin wherein the polyolefin comprises about 0.1 to 1 weight percent maleic anhydride.

15. The container of claim 7 wherein the polyethylene comprises a low-density polyethylene.

16. The container of claim 7 wherein the polyethylene comprises a linear low-density polyethylene.

17. The container of claim 7 wherein the polyethylene comprises a high-density polyethylene.

18. A film comprising a blend of a polyolefin resin and a modified polyolefin resin, the modified polyolefin resin comprising a polymethylene backbone having randomly instituted groups derived from a cyclodextrin compound, the film comprising about 100 parts weight of the polyolefin resin and about 0.01 to 10 parts by weight of the modified polyolefin; wherein the cyclodextrin compound is substantially free of a compound in the central pore of the cyclodextrin ring and wherein the cyclodextrin compound has a substituent substantially on at least one —OH group at the −2, −3 or the −6 position of the glucose moiety in the cyclodextrin.

19. The film of claim 18 wherein the film comprises a laminate comprising a paperboard layer and a polyolefin layer.

20. The film of claim 18 wherein the polyolefin comprises a melt index of about 15 to 100 g-10 min −1 .

21. The film of claim 18 wherein the polyolefin comprises a melt index of about 1.7 to 200 g-10 min −1 .

22. The film of claim 18 wherein the polyolefin comprises a polyethylene.

23. The film of claim 18 wherein the modified polyolefin comprises a modified polyethylene.

24. The film of claim 18 wherein the polyolefin comprises a polypropylene.

25. The film of claim 18 wherein the modified polyolefin comprises a modified polypropylene.

26. The film of claim 18 wherein the polyolefin comprises a poly(ethylene-co-propylene).

27. The film of claim 18 wherein the modified polyolefin comprises a modified poly(ethylene-co-propylene).

28. The film of claim 18 wherein the modified polyolefin comprises a cyclodextrin bonded to a maleic acid modified polyolefin wherein the polyolefin comprises about 0.05 to 5 weight percent maleic anhydride.

29. The film of claim 18 wherein the modified polyolefin comprises a cyclodextrin bonded to a maleic acid modified polyolefin wherein the polyolefin comprises about 0.1 to 2 weight percent maleic anhydride.

30. The film of claim 22 wherein the polyethylene comprises a low-density polyethylene.

31. The film of claim 22 wherein the polyethylene comprises a linear low-density polyethylene.

32. The film of claim 22 wherein the polyethylene comprises a high-density polyethylene.

33. A bottle cap comprising a closure shell for an enclosed volume, the volume surrounded by a polyolefin bottle, the closure shell comprising a web comprising a cap liner laminate comprising a paperboard layer bonded to polyolefin layer, the polyolefin layer comprising a blend of a polyolefin resin and a modified polyolefin resin, the modified polyolefin resin comprising a polymethylene backbone having randomly substituted covalently bonded groups derived from a cyclodextrin compound, the web comprising about 100 parts by weight of the polyolefin resin and about 0.01 to 10 parts by weight of the modified polyolefin per part by weight of the resin; wherein the cyclodextrin compound is substantially free of a compound in the central pore of the cyclodextrin ring.

34. The bottle cap of claim 33 , wherein threads along inner surface of the bottle cap mate with threads along the top, external surface of the bottle.

35. The bottle cap of claim 33 , wherein side walls extend from the bottom surface of said bottle cap and form a substantially cylindrical cavity.

36. The bottle cap of claim 33 wherein the polyolefin comprises a polyolefin having a melt index of about 0.5 to 100 g-10 min −1 .

37. The bottle cap of claim 33 wherein the polyolefin comprises a polyolefin having a melt index of about 0.7 to 200 g-10 min −1 .

38. The bottle cap of claim 33 wherein the polyolefin comprises a polyethylene.

39. The bottle cap of claim 33 wherein the modified polyolefin comprises a modified polyethylene.

40. The bottle cap of claim 33 wherein the polyolefin comprises a polypropylene.

41. The bottle cap of claim 33 wherein the modified polyolefin comprises a modified polypropylene.

42. The bottle cap of claim 33 wherein the polyolefin comprises a poly(ethylene-co-propylene).

43. The bottle cap of claim 33 wherein the modified polyolefin comprises a modified poly(ethylene-co-propylene).

44. The bottle cap of claim 33 wherein the modified polyolefin comprises a cyclodextrin bonded to a maleic acid modified polyolefin wherein the polyolefin comprises about 0.02 to 2 weight percent maleic anhydride.

45. The bottle cap of claim 33 wherein the modified polyolefin comprises a cyclodextrin bonded to a maleic acid modified polyolefin wherein the polyolefin comprises about 0.02 to 1 weight percent maleic anhydride.

46. The bottle cap of claim 38 wherein the polyethylene comprises a low-density polyethylene.

47. The bottle cap of claim 38 wherein the polyethylene comprises a linear low-density polyethylene.

48. The bottle cap of claim 38 wherein the polyethylene comprises a high-density polyethylene.

49. The film of claim 18 wherein the film encloses a food material.

50. The film of claim 49 wherein the food is a solid food.

51. The film of claim 49 wherein the food comprises ripening material.

52. The film of claim 51 wherein the ripening material is a fruit, vegetable, herb, or flower.

53. The film of claim 49 wherein the film comprises a multilayer structure.

54. The film of claim 53 wherein the structure contacting the food comprises the modified polyolefin resin.

Assignments (2)
CHANGE OF NAME Recorded Dec 4, 2020
From: CELLRESIN TECHNOLOGIES, LLC
To: VERDANT TECHNOLOGIES, LLC
Reel/Frame 054591/0969 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 11, 2013
From: WOOD, WILLARD E.; BEAVERSON, NEIL J.; SEETHAMRAJU, KASYAP V.
To: CELLRESIN TECHNOLOGIES, LLC
Reel/Frame 030775/0819 →
Continuity (3)
Division 10672297 · Sep 25, 2003
Provisional Application 60432523 · Dec 10, 2002
Related Publication 20060182917A1 · Aug 17, 2006