US 8,148,466 B2 · Amphoteric grafted barrier materials

Abstract

Thermoplastic polymer compositions, films, containers, laminates and fibers can comprise a modified polymer. The said modified polymer having a moiety comprising a half-ester reaction product of cyclodextrin and metal and/or organic group covalently bonded to some portion of the half-acid moieties. The cyclodextrin compound, grafted to the polymer structure, can scavenge impurities, permeants, or other undesirable volatile contaminants. The cooperation between the modified polymer's carboxylic acidic groups, basic groups and grafted cyclodextrin can provide active barrier properties to a film, web, fiber or other polymer structure. A permeant or a contaminant can be complexed or trapped within the polymer and held within the film, web or fiber preventing the permeant from passing into the interior of a container, or the contaminant can be scavenged from the enclosed headspace or surrounding environment.

Claims33

Dependent claims

A thermoplastic polymer composition, the composition capable of formation into thermoplastic fiber, film, fabric or web, consisting essentially of:

(a) a blend of a polyolefin resin and an anhydride-modified polyolefin resin,
(b) a stoichiometric reaction product of a cyclodextrin and the anhydride-modified polyolefin resin, and
(c) an alkaline earth metal on the anhydride-modified polyolefin resin;
wherein the polymer composition has a tri-functional trapping mechanism, the trapping mechanism consisting of carboxylic acid groups corresponding to the anhydride, the anhydride half-ester product of cyclodextrin, and a metal or organic group bonded to some portion of the anhydride half-acid groups;
wherein the cyclodextrin is substantially free of an inclusion complex including residual polymer contaminant.

2 more elements

Dependencies are inferred from the claim text.

Amphoteric grafted barrier materials

Life of this patent

Amphoteric grafted barrier materials

Life of this patent

Abstract

Claims33