Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1987-11-06
1990-10-09
Ivy, C. Warren
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521 64, 521 85, 521 87, 521 88, 521 89, 521 90, 521 94, 521 97, 521 95, 521 98, 521180, 524611, C08L 6900
Patent
active
049621319
ABSTRACT:
The invention is a composition useful for the preparation of POWADIR membranes of a bisphenol-based polycarbonate wherein at least 25 percent by weight of the bisphenol moieties are tetrahalogenated, wherein the halogen is Cl or Br, the composition comprising (i) a bisphenol-based polycarbonate wherein at least 25 percent by weight of the bisphenol moieties are tetrahalogenated, wherein the halogen is Cl or Br, (ii) a solvent for such polycarbonate, and (iii) a non-solvent for such polycarbonate. The composition is useful for extruding membranes wherein the membranes formed are POWADIR membranes with a discriminating region capable of separating oxygen from nitrogen.
The composition of this invention allows the formation of membranes with excellent physical properties, good separation factors for oxygen and nitrogen, with excellent fluxes.
REFERENCES:
patent: 3256675 (1966-06-01), Robb
patent: 3615024 (1971-10-01), Michaels
patent: 3709774 (1973-01-01), Kimura
patent: 3945926 (1976-03-01), Kesting
patent: 4032309 (1977-06-01), Salemme
patent: 4048271 (1977-09-01), Kesting
patent: 4075108 (1978-02-01), Higley et al.
patent: 4086310 (1978-04-01), Bottenbruch et al.
patent: 4374891 (1983-02-01), Ward
patent: 4772392 (1987-11-01), Sanders, Jr. et al.
patent: 4818254 (1989-04-01), Anand
Muruganandam, University of Texas at Austin, Paper entitled "Absorption and Transport in Substituted Polycarbonates and Polystyrene/Tetramethyl Polycarbonate Blends", 10/28-29/85.
Chern et al., Chapter 2, "Material Selection for Membrane Based Gas Separations", Material Science of Synthetic Membranes, Lloyd, Ed., pp. 25-46, American Chemical Society (1985).
Beck Henry N.
Lipscomb, II G. Glenn
Sanders, Jr. Edgar S.
Ivy C. Warren
The Dow Chemical Company
LandOfFree
Composition useful in process for preparing powadir membranes fr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Composition useful in process for preparing powadir membranes fr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Composition useful in process for preparing powadir membranes fr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-973862