Multilayered polymer structure for medical products

B - Operations – Transporting – 32 – B

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B32B 27/08 (2006.01) A61J 1/00 (2006.01)

Patent

CA 2272430

The present invention provides a multiple layer structure (10) for fabricating medical products. The layer structure (10) has a core layer (14) of an ethylene vinyl alcohol copolymer having an ethylene content of about 25-45 mole percent, a solution contact layer of a polyolefin positioned on a first side of the core layer, an outer (12) positioned on a second side of the core layer opposite the solution contact layer (16), the outer layer (12) being selected from the group consisting of polyamides, polyesters and polyolefins; two tie layers (18) - one of each adhered to the first and second sides of the core layer (14) and positioned between the solution contact layer (16) and the core layer (14) and between the outer layer (12) and the core layer (14), and wherein the structure (10) is produced in a cast coextrusion process.

La présente invention concerne une structure multicouches (10) destinée à la fabrication de produits médicaux. La structure de couches (10) possède une couche centrale (14) d'un copolymère d'alcool vinylique éthylène ayant une teneur en éthylène d'environ 25-45 mole pour cent, une couche de contact en solution d'une polyoléfine disposée sur une première face de la couche centrale, une couche extérieure (12) disposée sur une seconde face de la couche centrale opposée à la couche de contact en solution (16), la couche extérieure (12) étant sélectionnée dans le groupe constitué par des polyamides, des polyesters et des polyoléfines, deux couches de jonctions (18), chacune d'elles adhérant aux première et seconde face de la couche centrale (14) et disposées entre la couche de contact en solution (16) et la couche centrale (14), et entre la couche extérieure (12) et la couche centrale (14), la structure (10) étant obtenue par un procédé de coextrusion par coulée.

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