Coextruded, biaxially oriented multilayer film
First Claim
1. A coextruded, biaxially oriented multilayer film comprising:
- (a) a base layer comprising an extremely pure raw material which comprises at least one propylene polymer and at least one stabilizer for propylene polymers, and(b) an outer layer on at least one side of said base layer, comprising a raw material which comprises at least one propylene polymer and at least one stabilizer for propylene polymers,wherein said base layer raw material has an idealized thermal oxidation temperature of between about 260 and 300°
C., said outer layer raw material has an idealized thermal oxidation temperature of between about 240 and 300°
C., and said multilayer film as a whole has an idealized thermal oxidation temperature of between about 250 and 290°
C., and wherein said raw materials further comprise from 0 to about 100 ppm of at least one organic neutralizing agent.
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Accused Products
Abstract
A coextruded, biaxailly oriented multilayer film comprises a base layer comprising an extremely pure raw material and outer layer. It is suitable for use as an electrically insulating film, as a dielectric in an electrical capacitor, and has improved dielectrical properties for this purpose. The base layer and the outer layer or layers contain propylene polymer on one or both sides and stabilizers for propylene polymers. The raw material for the base layer has an idealized thermal oxidation temperature in the range of 260° to 300° C., preferably in the range 260° to 280° C., and the raw material for the outer layer or layers has an idealized thermal oxidation temperature in the region of 240° to 300° C., preferably in the range 240° to 270° C. The multilayer film as a whole has an idealized thermal oxidation temperature in the range 250° to 290° C., in paticular in the range 250° to 275° C. The content of organic neutralizing agents, in particular calcium stearate, in the raw materials is less than or equal to 100 ppm.
8 Citations
26 Claims
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1. A coextruded, biaxially oriented multilayer film comprising:
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(a) a base layer comprising an extremely pure raw material which comprises at least one propylene polymer and at least one stabilizer for propylene polymers, and (b) an outer layer on at least one side of said base layer, comprising a raw material which comprises at least one propylene polymer and at least one stabilizer for propylene polymers, wherein said base layer raw material has an idealized thermal oxidation temperature of between about 260 and 300°
C., said outer layer raw material has an idealized thermal oxidation temperature of between about 240 and 300°
C., and said multilayer film as a whole has an idealized thermal oxidation temperature of between about 250 and 290°
C., and wherein said raw materials further comprise from 0 to about 100 ppm of at least one organic neutralizing agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification