Grafted cyclodextrin

• US 7,605,199 B2
• Filed: 05/05/2006
• Issued: 10/20/2009
• Est. Priority Date: 12/10/2002
• Status: Active Grant

• Current Assignee: Verdant Technologies, Inc.
• Original Assignee: Cellresin Technologies, LLC
• Inventors: Seethamraju, Kasyap V., Wood, Willard E., Beaverson, Neil J.
• Primary Examiner(s): ZEMEL, IRINA SOPJIA
• Application Number:
  US11/429,579
• Publication Number:
  US 20060205873A1
• Time in Patent Office: 1,264 Days
• Field of Search: 524/48, 525/54.24, 525/54.2, 525/54.23, 525/54.21, 525/64, 525/186, 525/207, 525/285
• US Class Current: 524/48
• CPC Class Codes: B32B 27/02 in the form of fibres or filaments not used
• CPC Class Codes: B32B 27/28 comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: C08B 37/0012 Cyclodextrin [CD], e.g. cycle with 6 units (alpha), with 7 units (beta) and with 8 units (gamma), large-ring cyclodextrin or cycloamylose with 9 units or more; Derivatives thereof
• CPC Class Codes: C08L 23/04 Homopolymers or copolymers of ethene
• CPC Class Codes: C08L 2666/24 Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
• CPC Class Codes: C08L 5/16 Cyclodextrin; Derivatives thereof
• CPC Class Codes: C08L 51/06 grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
• CPC Class Codes: Y10T 428/13 Hollow or container type article [e.g., tube, vase, etc.]
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/1393 Multilayer [continuous layer]
• CPC Class Codes: Y10T 428/1397 Single layer [continuous layer]
• CPC Class Codes: Y10T 428/249926 Including paper layer
• CPC Class Codes: Y10T 428/24998 Composite has more than two layers
• CPC Class Codes: Y10T 428/269 including synthetic resin or polymer layer or component
• CPC Class Codes: Y10T 428/2878 including addition polymer from unsaturated monomer
• CPC Class Codes: Y10T 428/2929 Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
• CPC Class Codes: Y10T 428/298 Physical dimension
• CPC Class Codes: Y10T 428/31895 Paper or wood
• CPC Class Codes: Y10T 428/31902 Monoethylenically unsaturated

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

1. A thermoplastic polymer fiber comprising a blend of a polyolefin resin and a grafted polyolefin resin, the grafted polyolefin resin comprising an unmodified cyclodextrin grafted to an acid anhydride functionalized polyolefin resin, the acid anhydride functionalized polyolefin comprising acid anhydride functionality of about 0.02 to 5 weight % of the functionalized polyolefin, the fiber comprising the ungrafted polyolefin resin and a lesser amount of the grafted polyolefin resin;

wherein the unmodified cyclodextrin is substantially free of a compound in the central pore of the cyclodextrin ring.

2. The thermoplastic polymer fiber of claim 1 wherein the polyolefin comprises a melt index of about 0.5 to 100 g-10 min.⁻

1 and the grafted polyolefin is derived from a polyolefin with a melt index of 0.7 to 200 g-10 min.<sup>−

1</sup>.

3. The thermoplastic polymer fiber of claim 1 wherein the polyolefin comprises a melt index of about 1 to 75 g-10 min.⁻

1 and the grafted polyolefin is derived from a polyolefin having a melt index of about 1 to 100 g-10 min.<sup>−

1</sup>.

4. The thermoplastic polymer fiber of claim 1 wherein the fiber comprises a polyethylene, and a grafted polyethylene.

5. The thermoplastic polymer fiber of claim 1 wherein the fiber comprises a polypropylene, and a grafted polypropylene.

6. The thermoplastic polymer fiber of claim 4 wherein the grafted polyolefin comprises a cyclodextrin bonded to a maleic anhydride grafted-polyethylene wherein the polyethylene comprises about 0.02 to 2 weight percent maleic anhydride.

7. The thermoplastic polymer fiber of claim 5 wherein the grafted polyolefin comprises a cyclodextrin bonded to a maleic anhydride grafted polypropylene wherein the polypropylene comprises about 0.02 to 2 weight percent maleic anhydride.

8. The thermoplastic polymer fiber of claim 4 wherein the polyethylene comprises a low-density polyethylene.

9. The thermoplastic polymer fiber of claim 4 wherein the polyethylene comprises a linear low-density polyethylene.

10. The thermoplastic polymer fiber of claim 4 wherein the polyethylene comprises a high-density polyethylene.

11. The thermoplastic polymer fiber of claim 1 wherein fiber comprises about 100 parts by weight of the polyolefin resin and about 0.01 to 10 parts by weight of the grafted polyolefin, the polyolefin comprises melt index of about 0.5 to 150 g-10 min⁻

1 and the grafted polyolefin is derived from a polyolefin comprising a melt index of about 0.7 to 200 g-10 min.<sup>−

1</sup>.

12. The thermoplastic polymer fiber of claim 1 wherein the grafted polyolefin comprises a grafted poly(ethylene-co-propylene).

13. The thermoplastic polymer fiber of claim 1 wherein the fiber comprises about 0.1 to 8 wt % of the cyclodextrin grafted polyolefin.

14. A fabric comprising the fiber of claim 1.

15. The fabric of claim 14 comprising a non-woven fabric.

16. A disposable article comprising a layer comprising the non-woven fabric of claim 15.

17. The article of claim 16 comprising a disposable diaper.