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1. (WO2018197034) POLYOLEFIN FILM AND USE THEREOF

Pub. No.:    WO/2018/197034    International Application No.:    PCT/EP2018/000164
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Sat Apr 07 01:59:59 CEST 2018
IPC: C08J 5/18
B32B 27/32
Applicants: TOPAS ADVANCED POLYMERS GMBH
Inventors: GOERLITZ, Wolfram
Title: POLYOLEFIN FILM AND USE THEREOF
Abstract:
The invention relates to biaxially stretched polyolefin films containing a) 10 to 45 wt% of a cycloolefin polymer having a glass transition temperature between 120 und 170 °C, and b) 90 to 55 wt% of a partially crystalline alpha-olefin polymer having a crystallite melting temperature between 150 and 170 °C, wherein the glass transition temperature of component a) is less than or equal to the crystallite melting temperature of component b), and the polyolefin film exhibits a shrinkage at 130 °C after 5 minutes, measured according to DIN ISO 11501, of less than or equal to 2 %. Said polyolefin films are outstandingly suitable as dielectrics for capacitors, but also for other applications, and are characterized by a low shrinkage at high temperatures.