Grafted cyclodextrin
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.
1. A thermoplastic polymer composition, comprising a modified polyethylene, polypropylene or a poly(ethylene-co-propylene) resin comprising a polymethylene backbone comprising randomly substituted covalently bonded groups comprising a cyclodextrin compound; wherein an hydroxyl group of the cyclodextrin is bonded to the modified resin, and the cyclodextrin compound is substantially free of an inclusion compound in the central pore of the cyclodextrin ring.
2. The thermoplastic polymer composition of claim 1 wherein the modified polyethylene, polypropylene or a poly(ethylene-co-propylene) resin is derived from a polyethylene, polypropylene or a poly(ethylene-co-propylene) having a melt index of about 0,7 to 200 g-10 min. −1
3. The thermoplastic polymer composition of claim 1 wherein the modified polyethylene, polypropylene or a poly(ethylene-co-propylene) resin comprises a maleic anhydride modified polyolefin wherein the maleic anhydride modified polyolefin comprises about 0.05 to 5 weight percent maleic anhydride and wherein the modified polyethylene, polypropylene or a polyethylene-co-propylene) resin comprises a melt index of about 1 to 75 g-10 min. −1 and is derived from a polyolefin having a melt index of about 1 to 100 g-10 min. −1
4. The thermoplastic polymer composition of claim 1 wherein the modified resin comprises a cyclodextrin bonded to a maleic anhydride modified polyolefin resin, and wherein the modified polyethylene, polypropylene or a poly(ethylene-co-propylene) resin comprises about 0.1 to 2 weight percent maleic anhydride.
5. The thermoplastic polymer composition of claim 1 wherein the modified polyethylene comprises a low-density polyethylene.
6. The thermoplastic polymer composition of claim 1 wherein the modified polyethylene comprises a linear low-density polyethylene.
7. The thermoplastic polymer composition of claim 1 wherein the modified polyethylene comprises a high-density polyethylene.
8. The thermoplastic polymer composition of claim 1 wherein the modified polyethylene, polypropylene or a poly(ethylene-co-propylene) resin comprises a cyclodextrin bonded to an epoxy modified polyolefin.
9. The thermoplastic polymer composition of claim 1 wherein the substituent comprises azido, amino, acetylamino, alkylamino, hydroxyalkyl, heterocyclyl, alkylsulfonate, hydroxyalkylthio, or aminoalkylthio.
10. The thermoplastic composition of claim 1 wherein the modified resin comprises a packaging grade vinyl polymer.
11. The thermoplastic composition of claim 1 wherein the composition has a higher percent of crystallinity than the polyolefin without cyclodextrin.
12. The thermoplastic composition of claim 1 wherein the composition has a higher polarity and a lower equilibrium partition coefficient than the polyolefin without cyclodextrin.
13. The thermoplastic composition of claim 1 wherein the composition has selective barrier properties.
14. The thermoplastic composition of claim 1 further comprising a thermoplastic resin comprising a poly(ethylene-co-vinyl acetate), polyvinyl chloride, polyvinylidene chloride, butyl rubber, styrene-butadiene rubber, or acrylic rubber.
15. The thermoplastic composition of claim 1 further comprising a lubricant, an antistatic agent, a plasticizer, a heat stabilizer, an antioxidant, or a pigment.