A procedure for preparing polyamide membranes (Machine-translation by Google Translate, not legally binding)

Improvements introduced in the purpose of main patent n 480,577 submitted on may 14, 1979, by: _ (a procedure to prepare polyamide membranes.) is to use a polyamide resin with a proportion of methylene ch groups to nhida amida groups (ch : nhco) at an interval of 5: 1 to 7: 1. The solvent employed in the dissolution of the polyamide resin is formic acid and the non-solvent is water, the polyamide resin dissolution film is contacted with the non-solvent submerging the film on the spring of the substrate in a non-solvent bath that comprises water with formic acid, the bathrobe includes 20 to 55% resin solvent.the substrate used is a fibrous polyester plate. (Machine-translation by Google Translate, not legally binding)