초록 ▼

An 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

An 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.

대표청구항 ▼

The method for the preparation of a semipermeable composite membrane which comprises: reacting solutions of (1) a molar excess of an aromatic di-primary amine with (2) a mixture of a major amount of trimellitic anhydride acid halide and a minor amount of trimesoylchloride to form a water soluble pre

The method for the preparation of a semipermeable composite membrane which comprises: reacting solutions of (1) a molar excess of an aromatic di-primary amine with (2) a mixture of a major amount of trimellitic anhydride acid halide and a minor amount of trimesoylchloride to form a water soluble prepolymer; placing an aqueous solution of said prepolymer on a porous support to form a prepolymer film; reacting said prepolymer film with (3) a nonpolar solvent solution containing trimesoylchloride; and drying the membrane formed thereby.