Method for producing metalized fibrous composite sheet with olefin coating

A process for manufacturing a composite sheet comprising:

• providing a substrate having a first outer surface and an opposing second outer surface, the substrate comprising a nonwoven sheet selected from the group consisting of flash-spun plexifilamentary sheets, spunbond nonwoven sheets, spunbond-meltblown nonwoven sheets, spunbond-meltblown-spunbond nonwoven sheets, and laminates that include a nonwoven sheet or scrim bonded to a moisture vapor permeable film layer;
• metalizing the first outer surface of the substrate to form thereon a metal layer;
• depositing on the metal layer a precursor of an outer polymeric coating layer to form a precursor film, the precursor comprising a composition capable of being converted by free-radical processes;
• and
• treating the precursor to form the outer polymeric coating layer, the treating comprising:
• creating free radicals in the precursor to induce conversion of at least a portion thereof, the creating comprising exposure of the precursor film to ozone and irradiating the first outer surface with beam radiation provided by a radiation source.