C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/29
C08J 9/28 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 71/26 (2006.01)
Patent
CA 1239513
0.1 MICRON RATED POLYPROPYLENE MEMBRANES AND METHOD FOR ITS PREPARATION ABSTRACT OF THE DISCLOSURE There is disclosed a substantially skinless microporous polypropylene membrane characterized by having (a) a bubble point of about 25 to about 50 psi; (b) a thickness of about 3 to about 7 mils; (c) a nitrogen flow rate of at least 0.5 liters per square centimeter-minute; (d) a burst strength of at least 10 psi; and (e) an S value of about 15, or less. There is also disclosed a method of preparing a microporous polypropylene membrane comprising heating a mixture of about 30 percent polypropylene and about 70 percent, N,N-bis(2- hydroxyethyl)tallowamine, by weight, to a temperature and for a time sufficient to form a homogeneous solution, casting or extruding said solution at a thickness of about 3 to about 7 mils, onto a chill roll maintained at a temperature of from about 50 to about 80°C, allowing said solution to solidify on said chill roll to form a solid sheet, removing said solid sheet from said chill roll and removing at least a substantial portion of the liquid from said sheet to form the microporous polypropylene membrane.
440270
Davis Mike
Vitzthum Gunter H.
Akzona Incorporated
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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