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AssigneeTreofan Germany GmbH & Co. KG
InventorsThilo Mohr, Detlef Busch, Bertram Schmitz, Christian Peters
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The invention relates to a biaxially oriented microporous film composed of at least two coextruded layers encompassing an external shut-off layer and another layer, wherein both layers contain a mixture of propylene homopolymer and propylene block copolymer and β-nucleation agent. The propylene block copolymer I of the other layer has a melting point exceeding 140° C. and the propylene block copolymer II of the external shut-off layer has a melting range starting at a temperature ranging from 50 to 120° C. The melting point of the propylene block copolymer I is greater than the melting point of the propylene block copolymer II. The film can be used as a separator in a primary or secondary battery.
A biaxially oriented microporous film composed of at least two coextruded layers encompassing an external shut-off layer and second layer, wherein both layers contain a mixture of propylene homopolymer and propylene block copolymer and β-nucleation agent, wherein the propylene block copolymer of the second layer (propylene block copolymer I) has a melting point exceeding 140° C. and the propylene block copolymer of the external shut off layer (propylene block copolymer II) has a melting range starting a temperature ranging from 50 to 120° C. and the melting point of the propylene block copolymer I is greater than a melting point of the propylene block copolymer II and wherein the melting point of the propylene block copolymer I is 150 to 170° C. and a melting range starts at a temperature of over 120° C. and the melting point of the propylene block copolymer II is below 150° C.
Dependencies are inferred from the claim text.