公开(公告)号：EP0108601A2

公开(公告)日：1984-05-16

申请号：EP83306652.5

申请日：1983-11-01

Applicant: AKZO N.V.

Inventor： Vitzthum, Gunter H. ,  Davis, Michael A.

IPC: B01D71/26 ,  B01D67/00

CPC classification number: C08J9/28 ,  B01D67/003 ,  B01D69/02 ,  B01D71/26 ,  C08J2201/03 ,  C08J2201/052 ,  C08J2201/0542 ,  C08J2323/12 ,  Y10T428/249979

Abstract: There is disclosed a substantially skinless microporous polypropylene membrane characterized by having

(a) a bubble point in the range of from 25 to 50 psi;
(b) a thickness in the range of from 3 to 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 in the range of from 3 to 7 mils, onto a chill roll maintained at a temperature in the range of from 50 to 80°C, allowing the solution to solidify on the chill roll to form a solid sheet, removing the solid sheet from the chill roll and removing at least a substantial portion of the liquid from the sheet to form the microporous polypropylene membrane.

公开(公告)号：EP0108601B1

公开(公告)日：1990-05-30

申请号：EP83306652.5

申请日：1983-11-01

Applicant: AKZO N.V.

Inventor： Vitzthum, Gunter H. ,  Davis, Michael A.

IPC: B01D71/26 ,  B01D67/00

CPC classification number: C08J9/28 ,  B01D67/003 ,  B01D69/02 ,  B01D71/26 ,  C08J2201/03 ,  C08J2201/052 ,  C08J2201/0542 ,  C08J2323/12 ,  Y10T428/249979