Patent ID: 7399379
Filing Date: 2008-07-15
Classification: B32B,C08J,D21H,Y10T

Abstract:
1. A process for making a sheet structure comprising the steps of: a.) forming a ply containing a mica-rich face and a mica-poor face; and b.) attaching a reinforcing ply to the mica-poor face of the ply of step a), said reinforcing ply comprising a saturable backing layer, wherein the reinforcing ply is attached to the ply of step a) by laminating; with the provisos: (i) mica is present in both the mica-rich face and mica-poor face, (ii) mica in the mica-rich face is present in an amount of at least 60 weight percent based on the total weight of components in the mica-rich face and, (iii) mica in the mica-poor face is present in an amount less than 40 weight percent based on the total amount of components in the mica-poor face.