Hoechst Celanese Corporation

Celgard Inc.

Celanese Gmbh

Robert W Callahan

Richard D Johnson

Edward L Cussler

Khuy Van Nguyen

Bradley W Reed

Ta-Hua Yu

Paul R Alexander, Jr

Ken J Harleson

Ron W Call

Hongkyu Kim

A split resistant microporous membrane is provided for use in preparing a battery separator. The microporous membrane has a TD tensile strength to MD tensile strength ratio of from about 0.12 to about 1.2, preferably from about 0.5 to about 1. The microporous membrane is made by a process which includes the steps of preparing a film precursor by blown film extrusion at a blow-up ratio of at least 1.5, annealing the film precursor, and stretching the resultant annealed film precursor to form the microporous membrane.

Battery separators with reduced splitting propensity

The present invention is directed to a hydrophilic polyolefin article comprising a polyolefin article having a coating containing a surfactant and an ethylene vinyl alcohol (EVOH) copolymer.

Hydrophilic polyolefin having a coating containing a surfactant and an EVOH copolymer

The present invention is directed to a battery separator being an oriented microporous film containing ethylene vinyl alcohol copolymer with a filler, and a battery containing that separator.

Ethylene-vinyl alcohol copolymer battery separator

A composite membrane is disclosed having a microporous support which is coated with a UV curable polymer composition having a sufficiently high viscosity to prevent pore filling upon coating and curing. A process for making and a process for using the membrane is also disclosed.

Membranes from UV-curable resins

Composite porous membranes and methods of making the same

Systems and methods for predetermining maximum pressure differentials for particular microporous hollow fiber membranes and essentially immiscible feed and extractant liquids to be employed in liquid-liquid extractions include a test module having a number of such fibers formed into a loop between the opposing ends thereof. A tubular sleeve element encompasses these opposing ends, and a potting compound positionally retains the opposing ends within the tubular sleeve. The hollow fiber lumens are fluid-connected to a reservoir containing a pressurized feed liquid, and the loops of hollow fiber are immersed in an essentially unpressurized extractant liquid. The pressure of the feed liquid is continually increased until there is an incipient presence of the feed liquid in the extractant liquid. The pressure of the feed liquid at that incipient presence may therefore be used to calculate a maximum pressure differential tolerated by the microporous hollow fibers for the feed and extractant liquids used. The system which detects the incipient presence may also be associated with full scale liquid-liquid extraction modules so that malfunctions and/or module failures may be determined.

Systems and methods for predetermining maximum pressure differentials

The rate of mass transfer in liquid/liquid extractions can be increased by the appropriate selection of a solubilizing liquid to wet a microporous membrane. A solute is transferred between immiscible liquids across the membrane where and interface between the liquids is immobilized at a surface of the membrane.

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Charlotte, NC, United States of America

Robert W Callahan