Barrier layers
AssigneeBrugg Rohr AG Holding
InventorsJürgen Kress, Christian Dambowy
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Abstract
The invention relates to the use of special polymer layers as barriers, in particular as barrier layers in composite materials. Suitable polymers for the polymer layer are copolymers consisting of ethylene and vinyl alcohol or consisting of ethylene and carbon monoxide or consisting of ethylene and carbon monoxide and propylene. These barrier layers exhibit a selective barrier effect with respect to different gases, the barrier effect being especially effective with respect to HFOs. On account of these properties, such barrier layers can positively affect insulating properties, for example in thermally insulated pipes.
Claims17
Use of a polymer layer as a barrier material for a gas, whereby
- the layer thickness of the polymer layer is in the range of 0.03 to 0.5 mm;
- and
- the polymer of the polymer layer comprises a copolymer of ethylene and vinyl alcohol or a copolymer of ethylene and carbon monoxide or a copolymer of ethylene and carbon monoxide and propylene;
- and
- wherein said gas is selected from the group of hydrofluoroolefins (HFOs) having a boiling point above 0° C., comprising compounds of formula (I)
- where R5 and R6 represent, independently of one another, H, F, Cl, CF3.
Dependencies are inferred from the claim text.