Opaque polymeric films cavitated with syndiotactic polystyrene

Details Opaque polymeric films cavitated with syndiotactic polystyrene Opaque polymeric films cavitated with syndiotactic polystyrene

B - Operations, Transporting

32

B

B32B 27/20 (2006.01) B32B 27/32 (2006.01) B32B 27/36 (2006.01) B29C 47/00 (2006.01)

Patent

CA 2397208

A method for producing an opaque polymeric film comprises: (a) extruding a base layer comprising a polymeric matrix and at least one cavitating agent; (b) coextruding at least one additional layer on at least one side of the base layer; (c) cooling the coextruded multi-layer film; and then (d) orienting the film in at least the machine direction (MD); wherein at least said base layer contains a syndiotactic polystyrene polymer, and wherein said syndiotactic polystyrene polymer is in the form of solid, non-hollow particles during the orienting step (d).

L'invention porte sur un procédé de production d'un film polymère opaque consistant à : (a) extruder une couche de base comprenant une matrice polymère et au moins un agent de cavitation ; (b) coextruder au moins une couche additionnelle sur au moins un côté de la couche de base ; (c) refroidir le film multicouche coextrudé ; et ensuite (d) orienter le film dans le sens machine (MD). La couche de base renferme un polymère de polystyrène syndiotactique qui se présente sous la forme de particules non creuses, solides lors de l'étape d'orientation (d).

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