Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Reexamination Certificate
2007-01-26
2011-11-15
Johnson, Christina (Department: 1742)
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
Reexamination Certificate
active
08057718
ABSTRACT:
Disclosed herein is a microporous polyethylene film for a battery separator and a method of producing the same. The microporous polyethylene film is made from a resin composition. The resin composition comprises 100 parts by weight of a polyethylene composition including 10-50 wt % polyethylene having a weight average molecular weight of from 2×105to less than 5×105(component I) and 90-50 wt % diluent (component II), and 0-150 parts by weight of inorganic powder (component III). The film has a puncture strength of 0.20 N/μm or more and a gas permeability (Darcy's permeability constant) of 1×10−5Darcy or more. The microporous polyethylene film has excellent physical properties, thus improving the performance and stability of a battery.
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Encyclopedia of Polymer Science and Technology, “Antioxidants”, J. Wiley & Sons, Inc., Copyright 2002, vol. 4, pp. 179-208.
Jo Byoung Cheon
Lee Chol Ho
Lee Young Keun
Rhee Jang Weon
Sung Jung Moon
Clark & Brody
Johnson Christina
SK Innovation Co., Ltd.
Thrower Larry
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