| abstract |
The invention relates to a process for the extrusion of thermoplastic polymers with acidic ionic groups.The process consists of preparing a mixture consisting of a thermoplastic polymer with acidic ionic groups and a plasticizer, to extrude the mixture obtained to form a film, then washing in an aqueous medium the film obtained for removing said plasticizer (s). The plasticizer is chosen from non-volatile compounds which are stable with respect to the ionic groups of the polymer, which are soluble in water or in solvents which are miscible with water, said plasticizers being chosen from compounds which act with the ionic group of the polymer by formation of a weak bond of the hydrogen bonding type, and the compounds acting with the ionic group of the polymer by formation of a strong bond, of the ionic bond type. |