Preparation of anisotropic semi-permeable membranes of polyaryl ether/sulphones

• US 4,026,977 A
• Filed: 05/19/1972
• Issued: 05/31/1977
• Est. Priority Date: 05/24/1971
• Status: Expired due to Term

• Current Assignee: Bourganel Jack
• Original Assignee: Bourganel Jack
• Inventors: BOURGANEL JACK
• Application Number:
  US05/254,882
• Time in Patent Office: 1,838 Days
• US Class Current: 264/41
• CPC Class Codes: B01D 2323/081 Heating
• CPC Class Codes: B01D 2323/16 Swelling agents
• CPC Class Codes: B01D 2323/22 Specific non-solvents or non-solvent system
• CPC Class Codes: B01D 67/0011 Casting solutions therefor
• CPC Class Codes: B01D 67/00165 Composition of the coagulation baths
• CPC Class Codes: B01D 71/68 Polysulfones; Polyethersulfones
• CPC Class Codes: C08L 81/06 Polysulfones; Polyethersulfones

Abstract

Anisotropic sulphonated polyaryl ether/sulphone membranes having good salt rejection and flow rates making them particularly suitable for use in osmosis and ultrafiltration are provided by casting a solution of the polymer on a support, immersing the supported film in a coagulating bath and then recovering the film, in which:

Claims