Method of making a dope comprising hydrophilized PVDF and .alpha

Details Method of making a dope comprising hydrophilized PVDF and .alpha Method of making a dope comprising hydrophilized PVDF and .alpha

1999-05-14

2000-02-15

Kim, John

Liquid purification or separation

Filter

Material

21050042, 5253263, 525372, B01D 3900, C08F 800

Patent

active

060248726

ABSTRACT:
A filtration membrane for micro- or ultra-filtration is formed from a complex of PVDF and calcined .alpha.-alumina (".alpha.-Al") particles, in which complex the particles are reacted and dispersed. The suspended complex is then mixed with a hydrophilic polymer such as polyvinyl alcohol (40%-90% hydrolyzed) referred to herein as HPVA, which reacts with the complex imparting hydrophilicity to the polymer. The novel membrane provides about 50% higher specific flux than a membrane made with the same polymer but without the .alpha.-Al particles. Unexpectedly, the net flux is improved by treating the membrane with a solution of sodium hypochlorite which fails to remove the HPVA from the novel membrane but does remove it from the prior art membrane which does not contain the .alpha.-Al. The preferred membrane comprises a macroporous support coated on its outer surface with a thin tubular asymmetric semipermeable film of polymer containing less than about 50% by weight of .alpha.-Al particles.

REFERENCES:
patent: 3893971 (1975-07-01), Ukihashi et al.
patent: 4650819 (1987-03-01), Nakamoto et al.
patent: 4957943 (1990-09-01), McAllister et al.
patent: 5130342 (1992-07-01), McAllister et al.

Affiliated with

Also associated with

Rating

Method of making a dope comprising hydrophilized PVDF and .alpha does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of making a dope comprising hydrophilized PVDF and .alpha, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making a dope comprising hydrophilized PVDF and .alpha will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1903063