Polymer compositions and extrusion coated articles
AssigneeBorealis AG
InventorsAuli Nummila-Pakarinen, Mikko Peltovuori
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Abstract
The present invention relates to a polymer composition (A) comprising a blend of i) 60 to 90 wt-% of propylene polymer composition (a) comprising a blend of (a-1) 55 to 95 wt-% of propylene polymer and (a-2) 5 to 45 wt-% of low density ethylene polymer and ii) 10 to 40 wt-% of a plastomer (b) of ethylene copolymer. The invention relates also to extrusion coating articles, comprising at least a substrate layer and a heat sealable layer, wherein composition (A) is used as said heat sealable layer, process for producing the extrusion coated articles as well use of the composition (A) as a heat sealable layer in an extrusion coated article.
Claims17
A polymer composition (A) comprising a blend of
- i) 60 to 90 wt-% of propylene polymer composition (a) comprising a blend of
- (a-1) 55 to 95 wt-% of propylene polymer and
- (a-2) 5 to 45 wt-% of low density ethylene polymer (LDPE) which is a high pressure polyethylene,
- where the amounts of (a-1) and (a-2) are based on the total weight of composition (a), and composition (a) has a melt flow rate MFR2 of from 10 to 50 g/10 min (230° C./2.16 kg) and the Vicat softening temperature in the range of 120 to 155° C. measured according to ISO 306,
- and
- ii) 10 to 40 wt-% of a plastomer (b) of ethylene copolymer with at least one α-olefin comonomer of 4 to 10 C-atoms, provided that at least one comonomer is a monomer with at least 6 C-atoms
- where the amounts of (i) and (ii) are based on the total weight of the composition (A), and
- wherein the plastomer b) has a density of 880 to 912 kg/m3.
A polymer layer structure (PL) comprising
- 1) Layer 1 of polymer composition (A) comprising a blend of
- i) 60 to 90 wt-% of propylene polymer composition (a) comprising a blend of
- (a-1) 55 to 95 wt-% of propylene polymer and
- (a-2) 5 to 45 wt-% of low density ethylene polymer (LDPE) which is a high pressure polyethylene,
- where the amounts of (a-1) and (a-2) are based on the total weight of composition (a), and composition (a) has a melt flow rate MFR2 of from 10 to 50 g/10 min (230° C./2.16 kg) and the Vicat softening temperature in the range of 120 to 155° C. measured according to ISO 306,
- and
- ii) 10 to 40 percent by weight of a plastomer (b) of ethylene copolymer with at least one α-olefin comonomer of 4 to 10 C-atoms, provided that at least one co-monomer is a monomer with at least 6 C-atoms,
- where the amounts of (i) and (ii) are based on the total weight of the composition (A), and wherein the plastomer b) has a density of 880 to 912 kg/m3
- and
- 2) Layer 2 of a polymer composition being different to composition (A).
An extrusion coated article (EC) comprising
- I. a substrate layer (S) and
- II. a heat sealable polymer layer (H),
- wherein the heat sealable polymer layer (H) comprises a composition (A) comprising a blend of
- i) 60 to 90 percent by weight of propylene polymer composition (a) comprising a blend of
- (a-1) 55 to 95 percent by weight of propylene polymer and
- (a-2) 5 to 45 percent by weight of low density ethylene polymer (LDPE) which is a high pressure polyethylene,
- where the amounts of (a-1) and (a-2) are based on the total weight of composition (a), and composition (a) has a melt flow rate MFR2 of from 10 to 50 g/10 min (230° C./2.16 kg) and the Vicat softening temperature is in the range of 120 to 155° C. measured according to ISO 306,
- and
- ii) 10 to 40 percent by weight of a plastomer (b) of ethylene copolymer with at least one α-olefin comonomer of 4 to 10 C-atoms, provided that at least one co-monomer is a monomer with at least 6 C-atoms,
- where the amounts of (i) and (ii) are based on the total weight of the composition (A), and wherein the plastomer (b) has a density of 880 to 912 kg/m3.
Dependencies are inferred from the claim text.