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

Claim 5:
6. 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: (a) providing a first polyethylene film which first polyethylene film has been oriented in at least machine direction; (b) providing a second polyethylene film; (c) coextruding (c-1) a layer of a copolymer of ethylene and vinyl alcohol between the first polyethylene film and the second polyethylene film; and (c-2) tie layers on both sides of the layer of the copolymer of ethylene and vinyl alcohol; and (d) pressing the first polyethylene film and the second polyethylene film together thereby producing the multilayer structure.