POLYAMIDE-BASED MULTILAYER TUBE FOR TRANSFERRING FLUIDS IN WHICH EVOH LAYER IS REPLACED WITH LAYER PREPARED FROM BLEND OF POLYAMIDE AND POLYOLEFIN HAVING EVOH POLYAMIDE MATRIX

摘要

PURPOSE: Provided is a multilayer tube which have improved impact strength by replace EVOH layer with a layer prepared from polyamide/polyolefin blend having EVOH polyamide matrix. CONSTITUTION: The multilayer tube comprises an outer layer prepared from polyamide selected from PA-11, PA-12, alipathic polyamide produced by condensation of alipathic diamine having from 6 to 12 carbon atoms and alipathic diacid having from 9 to 12 carbon atoms, and 11/12 copolyamide wherein 11 units or 12 units account for more than 90%; a bonding layer; a layer prepared from blend of polyamide having polyamide matrix and polyolefin; a bonding layer; an inner layer prepared from polyamide which may be same or different from the outer layer, from outside to inside in the direction of radius. These layers is continuous and bonded to one another in the contact areas.