Polypropylene composition with excellent surface appearance
AssigneeBorealis AG
InventorsThomas Lummerstorfer, Daniela Mileva, Georg Grestenberger
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Abstract
The present invention is directed to a heterophasic polypropylene composition (HC) comprising a modified polypropylene composition (mPP), a process for preparing said heterophasic polypropylene composition (HC) and an article comprising said heterophasic polypropylene composition (HC). The present invention is further directed to the use of a composition comprising a peroxide (PO) and a crosslinking agent (CA) to reduce tigerskin of a polypropylene composition (PP).
Claims14
A heterophasic polypropylene composition (HC) comprising a modified polypropylene composition (mPP), wherein said modified polypropylene composition (mPP) is obtained by treatment of a polypropylene composition (PP) with a peroxide (PO) and a crosslinking agent (CA), said polypropylene composition (PP) comprising:
- i) a propylene polymer (PP1), and
- ii) a plastomer (PL) being a copolymer of ethylene and at least one C4 to C20 α-olefin,
- wherein;
- said heterophasic polypropylene composition (HC) has a ratio XCS/XHU in the range of 0.6 to 2.6, wherein XCS is the xylene cold soluble content [in wt. %] of the heterophasic polypropylene composition (HC) and XHU is the xylene hot insoluble content [in wt. %] of the heterophasic polypropylene composition (HC),
- and wherein
- the weight ratio of the propylene polymer (PP1) and the plastomer (PL) [w(PP1)/w(PL)] in the modified polypropylene composition (mPP) is from above 1.0 to 3.0, wherein w(PP1) is the overall amount of the propylene polymer (PP1) (in wt. %) within the modified polypropylene composition (mPP) and w(PL) is the overall amount of the plastomer (PL) (in wt. %) within the modified polypropylene composition (mPP).
Dependencies are inferred from the claim text.