Polymeric materials containing at least one continuous phase man-made
polymer and at least one biodegradable component are protected against
microbial attack through the use a combination of a boron-containing
compound and an organic biocide. Methods and compositions for preparing
treated polymeric materials are provided. A shaped article comprising a
continuous phase man-made thermoplastic resin polymer, a biodegradable
component, a boron-containing compound and an organic biocide is also
provided.