Microporous polyethylene film and method of producing the same

Details Microporous polyethylene film and method of producing the same Microporous polyethylene film and method of producing the same

2004-09-20

2008-10-14

Zemel, Irina S (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S064000, C521S062000, C521S142000, C521S143000

Reexamination Certificate

active

07435761

ABSTRACT:
Disclosed is a microporous polyethylene film for a battery separator and a method of producing the same. The microporous polyethylene film comprises a resin mixture, which includes 100 parts by weight of composition containing 20-50 wt % polyethylene with a weight average molecular weight of 5×104-3×105(component I) and 80-50 wt % diluent (component II), 0.1-2 parts by weight of peroxide (component III), and 0.05-0.5 parts by weight of anti-oxidant (component IV). The microporous polyethylene film has a puncture strength of 0.22 N/μm or more and a gas permeability (Darcy's permeability constant) of 1.3×10−5Darcy or more. The present invention increases production efficiency of the microporous film, and improves performances and stability of the battery when the microporous polyethylene film is used in a battery separator.

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Encyclopedia of Polymer Science and Technology, “Antioxidants”, J. Wiley $ Sons, 2004, vol. 4, pp. 179-208.

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