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US 11,634,571 B2Granted
Soft and transparent propylene compolymers
AssigneeBorealis AG
InventorsMarkus Gahleitner, Jingbo Wang, Carl-Gustaf Ek, Klaus Bernreitner
Life of this patent
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Abstract
The present invention is directed to a polypropylene composition (C) comprising a heterophasic propylene copolymer (RAHECO) and a plastomer (PL) as well as a process for the preparation of said polypropylene composition and a film obtained from said polypropylene composition (C).
Claims16
A polypropylene composition (C), comprising
- i) a heterophasic propylene copolymer (RAHECO), said heterophasic propylene copolymer comprising a matrix (M) being a random propylene copolymer (R-PP) and an elastomeric propylene copolymer (E) dispersed in said matrix (M),
- and
- ii) a plastomer (PL) being a copolymer of ethylene and at least one C4 to C20 α-olefin having a density below 0.900 g/cm3,
- wherein the random propylene copolymer (R-PP) comprises a first propylene copolymer fraction (R-PP1) and a second propylene copolymer fraction (R-PP2) and the comonomer contents of the random propylene copolymer (R-PP) and the first propylene copolymer fraction (R-PP1) fulfil inequation (IIIb),
- C
-
- o
-
- (
- R
-
- P
-
- P
- )
- C
-
- o
-
- (
- R
-
- P
-
- P
-
- 1
- )
- ≥
- 1.4
- ,
- (
- III
-
- b
- )
- wherein Co(RPP) is the comonomer content of the random propylene copolymer (R-PP) and Co(RPP1) is the comonomer content of the first propylene copolymer fraction (R-PP1), and wherein the first propylene copolymer fraction (R-PP1) is lean in comonomer compared to the second propylene copolymer fraction (R-PP2).
34 more elements
A film, comprising a polypropylene composition (C), the polypropylene composition comprising
- i) a heterophasic propylene copolymer (RAHECO), said heterophasic propylene copolymer comprising a matrix (M) being a random propylene copolymer (R-PP)
- and an elastomeric propylene copolymer (E) dispersed in said matrix (M),
- and
- ii) a plastomer (PL) being a copolymer of ethylene and at least one C4 to C20 α-olefin having a density below 0.900 g/cm3,
- wherein the random propylene copolymer (R-PP) comprises a first propylene copolymer fraction (R-PP1) and a second propylene copolymer fraction (R-PP2) and the comonomer contents of the random propylene copolymer (R-PP) and the first propylene copolymer fraction (R-PP1) fulfil inequation (IIIb),
- C
-
- o
-
- (
- R
-
- P
-
- P
- )
- C
-
- o
-
- (
- R
-
- P
-
- P
-
- 1
- )
- ≥
- 1.4
- ,
- (
- III
-
- b
- )
- wherein Co(RPP) is the comonomer content of the random propylene copolymer (R-PP) and Co(RPP1) is the comonomer content of the first propylene copolymer fraction (R-PP1), and wherein the first propylene copolymer fraction (R-PP1) is lean in comonomer compared to the second propylene copolymer fraction (R-PP2).
35 more elements
Dependencies are inferred from the claim text.