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AssigneeTeijin Limited
InventorsTakao Ohno, Jiro Sadanobu, Tsutomu Nakamura, Susumu Honda, Toyoaki Ishiwata
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A polymetaphenylene isophthalamide-based polymer porous film having a satisfactory porous structure that exhibits excellent gas permeability and heat resistance. It is produced by a process which comprises casting a dope of the polymetaphenylene isophthalamide-based polymer and coagulating it in a coagulating bath. The porous film may also contain inorganic whiskers, and a composite porous film may be formed in combination with a separate thermoplastic polymer film.
A polymetaphenylene isophthalamide-based polymer porous film with a gas permeability of 0.2-1000 ml/sec, which retains at least 60% of its gas permeability after heat treatment at 350° C. for 10 minutes compared to before treatment, while also having a porous structure with a porosity of 60-80% and a cross-sectional pore laminar coefficient of 2.5 or greater, and having a specific Young's modulus of 200-800 (kgf/mm2)/(g/cm3) in at least one direction, and containing inorganic whiskers having a long axis dimension L of 10-100 μm.
A polymetaphenylene isophthalamide-based polymer porous film containing inorganic whiskers having a long axis dimension L of 10-100 μm and having a porosity of 10-80% and a specific Young's modulus of 200-5000 (kgf/mm2)/(g/cm3) in at least one direction and having a cross-sectional pore laminar coefficient of 2.5 or greater.
A polymetaphenylene isophthalamide-based polymer porous film containing inorganic whiskers with a long axis dimension L of 10-100 μm, a short axis dimension D of 0.01-10 μm and an L/D ratio of 1.5 or greater, and having a porosity of 10-80% and a specific Young's modulus of 200-5000 (kgf/mm2)/(g/cm3) in at least one direction, and having a cross-sectional pore laminar coefficient of 2.5 or greater.
A polymetaphenylene isophthalamide-based polymer porous film with a gas permeability of 0.2-1000 ml/sec, which retains at least 60% of its gas permeability after heat treatment at 360° C. for 10 minutes compared to before treatment, while also having a porous structure with a porosity of 60-80% and a cross-sectional pore laminar coefficient of 2.5 or greater and containing inorganic whiskers having a long axis dimension L of 10-100 μm, and which is obtained by a process comprising a step of casting a dope prepared by dissolving a polymetaphenylene isophthalamide-based polymer in an amide-based solvent and a step of coagulating the cast dope in a coagulating bath comprising an amide-based solvent containing a non-solvent for the polymer.
A method of using a polymetaphenylene isophthalamide-based polymer porous film, comprising disposing a polymetaphenylene isophthalamide-based polymer porous film as a separator between an anode and a cathode of a battery, wherein the porous film has a gas permeability of 0.2-1000 ml/sec, retains at least 60% of its gas permeability after heat treatment at 360° C. for 10 minutes compared to before treatment, while also having a porous structure with a porosity of 60-80% and a cross-sectional pore laminar coefficient of 2.5 or greater and containing inorganic whiskers having a long axis dimension L of 10-100 μm, and having a specific Young's modulus of 200-5000 (kgf/mm2)/(g/cm3) in at least one direction.
Dependencies are inferred from the claim text.