ELECTRICALLY INSULATING FILM BACKING

摘要

A halogen-free, electrically insulating film comprising a resin component containing: a) from 0 to 40 parts of a rubber selected from EP or EPDM rubber; b) correspondingly, from 60 to 100 parts of an ethylene vinyl acetate polymer, c) from 40 parts to 150 parts ethylene diamine phosphate per 100 parts of said resin component; and d) from 0.5 to 5 parts of an amino-functional silane coupling agent per 100 parts resin component; wherein a nonoriented film self-extinguishes in less than 5 seconds, has an elongation at break of at least 200 %, a dielectric strength of at least 1200 V/Mil, and said film has a stress-strain relationship such that a curve showing a first derivative of stress versus strain is positive over the entire curve, and a curve showing a second derivative of stress versus strain is negative over more than 50 % of said curve.