Polyolefin Construction
AssigneeBorealis AG
InventorsHarry Oysaed, Markus Gahleitner, Karl Isak Skau, Geir Morton Johansen
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Abstract
A polyolefin construction comprising at least one polyolefin (PO) layer, a barrier layer for the polyolefin layer and a compatibiliser for the PO and the barrier layer, which compatibiliser enables the PO and barrier layer to adhere together, whereby the barrier layer comprises the compatibiliser; a blended barrier layer polymer and the barrier layer formed therefrom and a process for producing the polyolefin construction.
Claims12
1-15. (canceled)
A polyolefin construction comprising
- a polyolefin layer (PO) which comprises ethylene-propylene random copolymers having a comonomer content of 1.5 to 6% by weight and a melt flow rate (MFR;
- 230° C./2.16 kg;
- ISO 1133) of 1 to 100 g/10 min,
- a barrier layer which forms a barrier against O2, CO2 and liquid or volatile hydrocarbons for the polyolefin layer, and
- a compatibiliser for the PO and the barrier layer which comprises maleic anhydride grafted polypropylene or polyethylene homo- or copolymers and/or maleic anhydride grafted and/or hydrogenated styrene block copolymers having a melt flow rate (230° C./2.16 kg;
- ISO 1133) of 1 to 100 g/10 min and wherein the anhydride content of maleic anhydride grafted polymers is 0.1 to 10 wt %, and which enables the PO and barrier layer to adhere together,
- whereby the barrier layer comprises the compatibiliser.
A PO construction according to claim 61, exhibiting an adhesion force between the barrier layer and the PO layer of >3N up to 20 N (ASTM D 1876-01).
A blend mixture for forming a barrier layer comprising a barrier layer forming polymer which is selected from the group consisting of polyamide, polyvinyl alcohol copolymers or ethylene vinyl alcohol copolymers or blends thereof and 0.1-20 wt % of a compatibiliser, based on the amount of barrier forming polymer, wherein the compatibiliser comprises maleic anhydride grafted polypropylene or polyethylene homo- or copolymers and/or maleic anhydride grafted and/or hydrogenated styrene block copolymers having a melt flow rate (230° C./2.16 kg;
- ISO 1133) of 1 to 100 g/10 min and wherein the anhydride content of maleic anhydride grafted polymers is 0.1 to 10 wt %.
At least two layer article comprising
- I. a first layer comprising ethylene-propylene random copolymers having a comonomer content of 1.5 to 6% by weight and a melt flow rate (MFR;
- 230° C./2.16 kg;
- ISO 1133) of 1 to 100 g/10 min,
- II. a second layer comprising an bather layer forming polymer which is selected from the group consisting of polyamide, polyvinyl alcohol copolymers or ethylene vinyl alcohol copolymers or blends thereof
- blended with a compatibiliser which comprises maleic anhydride grafted polypropylene or polyethylene homo- or copolymers and/or maleic anhydride grafted and/or hydrogenated styrene block copolymers having a melt flow rate (230° C./2.16 kg;
- ISO 1133) of 1 to 100 g/10 min and wherein the anhydride content of maleic anhydride grafted polymers is 0.1 to 10 wt %
- and
- III. optionally a third layer comprising a random polypropylene copolymer.
Dependencies are inferred from the claim text.