Electrically insulating film backing

H - Electricity – 01 – B

Patent

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Details

H01B 3/44 (2006.01) C08K 5/52 (2006.01) C08L 23/04 (2006.01)

Patent

CA 2171837

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.

Film isolant électriquement, exempt d'halogène et comprenant un constituant résineux composé: a) de 0 à 40 parties d'un caoutchouc sélectionné à partir de caoutchouc EP ou EPDM; b) de 60 à 100 parties d'un polymère d'acétate de vinyle d'éthylène; c) de 40 à 150 parties de phosphate de diamine d'éthylène pour 100 parties dudit constituant résineux; d) de 0,5 à 5 parties d'un agent de copulation de silane à fonction amino pour 100 parties du constituant résineux. Ledit film non orienté s'éteint automatiquement en moins de 5 secondes, possède un allongement à la rupture d'au moins 200 %, une résistance diélectrique d'au moins 1200V/Mil; ledit film présente un rapport contrainte-déformation tel qu'une courbe comportant une première dérivée de la contrainte par rapport à la déformation est positive sur sa totalité, et qu'une courbe comportant une deuxième dérivée de la contrainte par rapport à la déformation est négative sur plus de 50 %.

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