Patent ID: 9431172
Filing Date: 2016-08-30
CPC Classification: B32B,H01B,H01G,Y10T

Claim Text:
1. A biaxially-oriented electrical insulating film comprising a base layer and at least one covering layer, wherein said base layer comprises a mixture of a polypropylene P1 and a different polypropylene P2, wherein said polypropylene P1 is a linear polypropylene and has an Mw/Mn of greater than 5 and a mesopentadene isotaxy in the range of from 96.5% to 99.5% and said polypropylene P2 has (i) a long-chain branching, and wherein the branching index g′ of said polypropylene P2 is in the range of from 0.6 to 0.8, (ii) an average molecular weight Mw of polymer P2, determined by means of GPC is in the range of 400,000 to 650,000, (iii) has a ratio Mw/Mn of greater than 5 to 10, (iv) has a triad-related chain isotaxy index of 93 to 98%, (v) has an ash content of 10 to 40 ppm, and (vi) a chlorine content of greater than 0 to 5 ppm and wherein the base layer further contains an additive selected from the group consisting of a neutralization agent and a stabilizer.