Extrusion of a thermoplastic polymer bearing acid ionic...

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B01D 67/00 (2006.01) B01D 71/52 (2006.01) B01D 71/68 (2006.01) B01D 71/82 (2006.01) C08J 5/22 (2006.01) C08L 71/00 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2599602

The invention relates to a method for the extrusion of thermoplastic polymers comprising acid ionic groupings. The inventive method consists in: preparing a mixture comprising (i) a thermoplastic polymer bearing acid ionic groupings and (ii) a plasticiser; extruding the mixture thus obtained in order to form a film; and, subsequently, washing the film obtained in an aqueous medium in order to eliminate said plasticiser(s). The aforementioned plasticiser is selected from among non-volatile compounds which are stable in relation to the ionic groupings of the polymer and which are soluble in water or in water-miscible solvents, said plasticisers being selected from among the compounds that act with the ionic grouping of the polymer with the formation of a weak hydrogen-bond-type binding and the compounds that act with the ionic grouping of the polymer with the formation of an strong ionic-bond-type binding.

L'invention concerne un procédé pour l'extrusion de polymères thermoplastiques à groupements ioniques acides. Le procédé consiste à préparer un mélange constitué par un polymère thermoplastique à groupements ioniques acides et par un plastifiant, à extruder le mélange obtenu pour former un film, puis à laver en milieu aqueux le film obtenu pour éliminer ledit (lesdits) plastifiant(s). Le plastifiant est choisi parmi les composés non volatils qui sont stables vis- à-vis des groupements ioniques du polymère, qui sont solubles dans l'eau ou dans les solvants miscibles à l'eau, lesdits plastifiants étant choisis parmi les composés agissant avec le groupe ionique du polymère par formation d'une liaison faible de type liaison hydrogène, et les composés agissant avec le groupe ionique du polymère par formation d'une liaison forte, de type liaison ionique.

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