Patent ID: 11865818
Assignee: BOREALIS AG
Field: Surface technology, coating (Chemistry)
Classification: CPC B | IPC B

Claim 0:
1. A process for producing a multilayer structure comprising (i) a first polyethylene layer as a first external layer, the first polyethylene layer being oriented in at least machine direction; (ii) a second polyethylene layer as a second external layer; (iii) a layer made of a copolymer of ethylene and vinyl alcohol (EVOH) between the first external layer and the second external layer; and (iv) a tie layer on each side of the EVOH layer, wherein the tie layers comprise one or more copolymers of ethylene, the process comprising: (I) providing a substrate, wherein the substrate is a polyethylene film which has been oriented in at least machine direction; (II) coextruding onto the substrate (II-1) a layer of a copolymer of ethylene and vinyl alcohol; (II-2) a second polyethylene layer; and (II-3) tie layers on both sides of the layer of the copolymer of ethylene and vinyl alcohol, wherein the layer of the copolymer of ethylene and vinyl alcohol is between the substrate and the second polyethylene layer, thereby producing the multilayer structure.