Composite semipermeable membranes made from polyethylenimine
Semipermeable membranes and the method for the preparation thereof
Reverse osmosis membrane
Preparation of solid polymers from aromatic primary diamine and acyl halide of trimellitic anhydride
ApplicationNo. 06/674486 filed on 11/26/1984
US Classes:427/244, Filter, sponge, or foam210/500.28, Cyclic210/500.37, Amine264/41, PORE FORMING IN SITU (E.G., FOAMING, ETC.)427/340, Resin, resin precursor, rubber, or hardenable oil containing coating427/342Textile or cellulosic base
ExaminersPrimary: Lawrence, Evan K.
Attorney, Agent or Firm
International ClassesB01D 71/56 (20060101)
B01D 69/12 (20060101)
B01D 71/00 (20060101)
B01D 69/00 (20060101)
AbstractAn excellent reverse osmosis membrane having a high flux with superior chlorine resistance and low salt passage can be obtained by interfacially condensing a water soluble aromatic polyamide prepolymer with an essentially monomeric, aromatic, amine reactive polyfunctional acyl halide. The polyamide prepolymer may be prepared through the condensation reaction of an aromatic diamine and an aromatic anhydride acyl halide. Preferably the amide prepolymer, prepared from metaphenylene diamine and trimelletic anhydride acid chloride, is reacted with trimesoylchloride to form the thin film membrane of the subject invention.