| abstract |
The thermoplastic polymer compositions, films, containers, laminates and fibers, may contain a modified polymer. Said modified polymer has a portion containing a semi-ester reaction product of cyclodextrin and metal and / or an organic group covalently bonded to some part of the semi-acidic portions. The cyclodextrin compound, grafted into the polymer structure, can purify impurities, permeants or other undesirable volatile contaminants. The cooperation between the carboxylic acid groups of the modified polymers, basic groups and grafted cyclodextrin, can provide active barrier properties to a film, mesh, fiber or other polymeric structure. A permeant or a contaminant can form complex or be trapped inside the polymer and be kept inside the film, mesh or fiber, or the contaminant can be purified from the surrounding frontal space or from the surrounding environment. |