Opaque polymeric films cavitated with pbt and polycarbonate

Details Opaque polymeric films cavitated with pbt and polycarbonate Opaque polymeric films cavitated with pbt and polycarbonate

B - Operations, Transporting

32

B

B32B 27/20 (2006.01) B29C 47/06 (2006.01) B32B 27/32 (2006.01) B32B 27/36 (2006.01)

Patent

CA 2392760

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 polybutylene terephthalate (PBT) and polycarbonate.

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 polybutylène téréphtalate (PBT) et un polycarbonate.

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