Patent ID: 6616994
Filing Date: 2003-09-09
Classification: B29C,B29L,B32B,B60K,C08L,Y10T

Abstract:
Multilayer fuel tank or tubing for filling said tank, made of a thermoplastic, comprising a hollow body, produced by coextrusion-blow moulding and consisting of four layers, which are defined as a), b), c), and d) from the inside to the outside:a) one layer is a blend comprising at least one polyolefin and at least one functionalized polyolefin, wherein the said functionalized polyolefin comprises functional monomeric units selected from the group consisting of carboxylic acids, dicarboxylic acids and the anhydrides thereof, and b) a barrier layer, made of a polyamide, a random ethylene-vinyl alcohol copolymer or a blend of a polyamide and a random ethylene-vinyl alcohol copolymer, wherein layer a) is bonded directly to said barrier layer; c) a third layer is a second blend comprising at least the functionalized polyolefin and a recycled polyolefin which comes from the grinding of scrap obtained at various steps in the manufacture of the multilayer fuel tank or tubing; and d) a fourth layer comprising a virgin polyolefin.