Method of producing films by means of coextrusion blow-moulding

Details Method of producing films by means of coextrusion blow-moulding Method of producing films by means of coextrusion blow-moulding

B - Operations, Transporting

29

C

B29C 47/06 (2006.01) B29C 47/00 (2006.01) B32B 7/06 (2006.01) B32B 27/08 (2006.01)

Patent

CA 2463844

The invention relates to a method of producing a film comprising at least one layer of a polymer selected from among thermoplastic fluoro-polymers and polymers (A). The inventive method consists in using extrusion blow moulding to coextrude the following: a) at least one layer of a thermoplastic fluoro-polymer and at least one layer of polymer (A); or b) at least one layer of a thermoplastic fluoro-polymer containing charges and optionally at least one other fluoro-polymer layer; or c) at least one layer of polymer (A), the layers extruded in a), b) or c) adhering to one another; d) a layer of another thermoplastic polymer (B) such that it forms a layer which is adjacent to the assembly of layers extruded in a), b) or c); e) optionally another layer of (B) which is adjacent to the assembly of layers extruded in a), b) or c) on the side opposite that of the layer extruded in d). According to the invention, the thermoplastic polymer (B) is incompatible with the fluoro-polymer and polymer (A) and has adequate extrudate behaviour to support the layers of fluoro-polymer and/or polymer (A). Once the coextrudate has been cooled, by separating the layer(s) of (B), at least the film is recovered, said film comprising at least one layer of a polymer selected from among thermoplastic fluoro-polymers and polymers (A).

L'invention concerne un procédé de fabrication d'un film comprenant au moins une couche d'un polymère, par coextrusion soufflage de gaine. Le procédé selon l'invention est caractérisé en ce que l'on coextrude (a) soit au moins une couche d'un polymère fluoré thermoplastique et au moins une couche d'un polymère (A), (b) soit au moins une couche d'un polymère fluoré thermoplastique contenant des charges et éventuellement au moins une autre couche de polymère fluoré, (c) soit au moins une couche d'un polymère (A), les couches extrudées en (a), (b) ou (c) adhérant entre elles, (d) une couche d'un autre polymère thermoplastique (B) de sorte qu'il forme une couche adjacente à l'ensemble des couches extrudées en (a), (b) ou (c), le polymère thermoplastique (B) étant incompatible avec le polymère fluoré et le polymère (A) et possédant une tenue d'extrudat suffisante pour supporter les couches de polymère fluoré et/ou de polymère (A), de façon à obtenir un coextrudat. On refroidit ensuite le coextrudat et, par séparation de la couche de polymère thermoplastique (B), on récupère au moins un film comprenant au moins une couche de polymère fluoré thermoplastique et/ou de polymère (A).

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