Soft and transparent impact copolymers
AssigneeBorealis AG
InventorsJingbo Wang, Pavel Shutov, Johanna Lilja, Markus Gahleitner
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Abstract
The present invention is directed to a new heterophasic propylene copolymer (RAHECO) and an unoriented film comprising the heterophasic propylene copolymer (RAHECO) as well as a container comprising the unoriented film. The present invention is further directed to the use of the heterophasic propylene copolymer (RAHECO) for improving the balance between softness and haze of an unoriented film.
Claims19
A heterophasic propylene copolymer (RAHECO), said heterophasic propylene copolymer (RAHECO) comprises a matrix (M) being a random propylene copolymer (R-PP) and an elastomeric propylene copolymer (E) dispersed in said matrix (M),
- wherein the heterophasic propylene copolymer (RAHECO) has
- a) a melt flow rate MFR2 (230° C.) measured according to ISO 1133 in the range of 2.0 to 10.0 g/10 min,
- b) a xylene cold soluble content (XCS) determined according ISO 16152 (25° C.) in the range of 16.0 to 35.0 wt.-%,
- c) a comonomer content in the range of 8.5 to 21.0 mol-%, and
- wherein the heterophasic propylene copolymer (RAHECO) has at least two glass transition temperatures Tg(1) and Tg(2), the first glass transition temperature Tg(1) relates to the matrix (M) while the second glass transition temperature Tg(2) relates to the dispersed elastomeric propylene copolymer (E), wherein further the second glass transition temperature Tg(2) fulfills the in-equation (I),
- Tg(2)>21.0−2.0×C(XCS) (I)
- wherein
- Tg(2) is the second glass transition temperature of the heterophasic propylene copolymer (RAHECO);
- C(XCS) is the comonomer content [in mol-%] of the xylene cold soluble fraction (XCS) of the heterophasic propylene copolymer (RAHECO).
Dependencies are inferred from the claim text.