Patent ID: 9643840
Date: 2017-05-09
CPC Classifications: B29C,B29K,B29L,B32B,B81B,B81C,C08G,C08J,H01B,H01L,Y10T

Claim:
1. A process for producing a dielectric polyurethane film, in which at least the following steps are performed continuously: I) producing a mixture comprising II) immediately after production of the mixture, applying the mixture to a carrier in the form of a wet film, III) curing the wet film to form the polyurethane film and IV) separating the polyurethane film from the carrier, wherein the wet film is cured in step III) by conducting the wet film through a first drying section having a temperature of ≧40° C. and ≦120° C., wherein the total residence time of the wet film in the drying section is ≧10 seconds and ≦60 minutes, wherein the dielectric polyurethane film has an electrical resistivity >1.5E12 ohm m determined according to ASTM D 257 and wherein the creep at 10% deformation after 30 min to DIN 53 441 is <30%.