Metalized fibrous composite sheet with olefin coating

Abstract

A composite sheet comprises a substrate and a multi-layer coating on its outer surface, the coating comprising a metal layer and an outer polymeric layer formed from a precursor comprising a polymerizable composition that includes a olefin group and a moisture curable group, such as an isocyanate or silane group. The function of the polymeric layer includes protecting the metal layer from corrosion. A production process for the composite sheet includes depositing the precursor and exposing it to both beam radiation and moisture, which respectively promote polymerization and curing at different sites of the precursor. The amenability of the isocyanate or silane functionality to moisture-promoted coupling promotes substantially full conversion and curing of the precursor, even of portions of the substrate that are geometrically shadowed from incident beam radiation.

What is claimed is: 
     
         1 . A composite sheet comprising:
 a substrate having a first outer surface and an opposing second outer surface; and   a multi-layer coating on the first outer surface of the substrate, the multi-layer coating comprising:
 a metal layer overlaying the first outer surface of the substrate; and 
 an outer polymeric coating layer overlaying the metal layer and formed by curing a precursor that comprises a dual-function composition that includes an olefin group and a moisture-curable group. 
   
     
     
         2 . The composite sheet of  claim 1 , wherein the olefin group is radically polymerizable. 
     
     
         3 . The composite sheet of  claim 1 , wherein the precursor further comprises an acrylate or methacrylate composition. 
     
     
         4 . The composite sheet of  claim 1 , wherein the moisture curable group is a moisture curable silane group. 
     
     
         5 . The composite sheet of  claim 1 , wherein the metal layer consists essentially of aluminum. 
     
     
         6 . The composite sheet of  claim 1 , wherein the emissivity of the metal layer is at most about 0.2.