Moulded prods., esp. hollow tubing etc., with oxygen barrier layer

摘要

Moulded prods. with an oxygen barrier layer, esp. hollow section mouldings, comprise a first layer (A) made of organosilane-grafted polyolefin and an oxygen barrier layer (B) consisting of material which can form covalent bonds with the grafted organosilane gps. in layer (A) and which is coextruded directly onto layer (A) under pressure. Also claimed is the prodn. of these mouldings, in which the melt streams for layers (A) and (B), and opt. for a base layer and another barrier layer, are fed into an extruder head and coextruded in close contact at up to 300 bar.