Coextrusion of liquid crystal polymers and thermoplastic...

B - Operations – Transporting – 32 – B

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B32B 1/08 (2006.01) B29C 47/06 (2006.01) B29C 47/24 (2006.01) B29C 47/28 (2006.01) B29C 49/22 (2006.01) C09K 19/38 (2006.01)

Patent

CA 2214038

A flat and nearly mechanically isotropic polymer film or sheet (38), or a tube, can be formed by laminating two or more films, preferably by coextrusion of a liquid crystal polymer film and a thermoplastic polymer film. A liquid crystal polymer layer may be combined with one or more thermoplastic polymer layer in various arrangements. The liquid crystal, and possibly the thermoplastic as well, may have a controlled molecular orientation. The film (38) may be formed by passing a polymer through a set of two or three tubular rotors (32, 36) which are concentric and have facing surfaces which define inner and outer annular polymer flow channels.

On peut former une pellicule ou une feuille de polymère plate et presque isotrope mécaniquement (38), ou un tube, en stratifiant deux ou trois pellicules, de préférence par co-extrusion d'une pellicule de polymère à cristaux liquides et d'une pellicule de polymère thermoplastique. Une couche de polymère à cristaux liquides peut être combinée avec une ou plusieurs couches de polymère thermoplastiques suivant différentes dispositions. Le polymère à cristaux liquides, et éventuellement le polymère thermoplastique, peuvent avoir une orientation moléculaire contrôlée. La pellicule (38) peut être formée par le passage d'un polymère à travers un ensemble de deux ou trois rotors tubulaires (32, 36) concentriques, dont les surfaces opposées définissent des canaux d'écoulement du polymère, intérieur et extérieur, en couronne.

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