Patent ID: 7335276

Claim:
A process for forming a laminate comprising in order a layer of an aramid paper, a layer of polymer and a layer of an aramid paper a) comprising the steps of calendering an aramid paper between two heated rolls each maintained at an elevated temperature which differ by a temperature of at least 20 degrees centigrade wherein a surface of the paper exposed to a lower roll temperature is more porous than an opposite surface exposed to a higher roll temperature, b) calendering an aramid paper between two heated rolls each maintained at an elevated temperature which differ by a temperature of at least 20 degrees centigrade wherein a surface of the paper exposed to a lower roll temperature is more porous than an opposite surface exposed to a higher roll temperature, C) applying polymer to the more porous surface of the aramid paper from step a) and d) laminating the aramid paper from step b) onto the polymer wherein the more porous surface of the aramid paper contacts the polymer.