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US 11,230,637 B2Granted
Soft polypropylene composition with improved properties
AssigneeBorealis AG
InventorsMarkus Gahleitner, Jingbo Wang, Friedrich Berger
Life of this patent
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Abstract
Soft polypropylene composition with improved optical and mechanical properties and especially improved resistance to steam sterilization, as well as to its manufacture and use and to articles made out of the new composition.
Claims13
Soft heterophasic propylene copolymer composition, which comprises:
- (A) 50.0 to 99.0 wt % of a heterophasic polypropylene copolymer, said heterophasic propylene copolymer comprises:
- (a-1) a matrix (M) being a crystalline polypropylene homo- or copolymer and
- (a-2) elastomeric propylene copolymer (E) dispersed in said matrix (M),
- wherein the heterophasic polypropylene copolymer has;
- (i) a melt flow rate (MFR 230° C./2.16 kg, ISO1133) of 0.5 to 20.0 g/10 min,
- (ii) a xylene cold soluble (XCS) content determined according to ISO 16152 (25° C.) in the range of 15.0 to 30.0 wt %,
- (iii) a total ethylene or C4-C8 comonomer content in the range of 5.0 to 13.0 wt %,
- (iv) wherein the heterophasic polypropylene copolymer is free of phthalic acid esters or their decomposition products originating from a Ziegler-Nata catalyst, and
- (B) 1.0 to 50.0 wt % of a styrene-based elastomer (B) being a saturated block copolymer of styrene with ethylene and butylene or propylene, having a styrene content in the range of 5.0 to 22.0 wt % (measured with FTIR),
- the soft heterophasic propylene copolymer composition having a flexural modulus measured according to ISO 178 on injection moulded specimens of below 450 MPa.
7 more elements
Dependencies are inferred from the claim text.