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US 10,882,934 B2Granted
Propylene-butylene copolymers with improved mechanical and optical properties and better processability as well as articles made therefrom
AssigneeBorealis AG
InventorsJingbo Wang, Wilfried Töltsch, Elisabeth Potter, Markus Gahleitner
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Abstract
The present invention relates to nucleated propylene-butylene copolymers comprising propylene and butylene monomer units, wherein the nucleated propylene-butylene copolymer has improved stiffness, better impact behaviour and optical properties such as low haze and improved optomechanical ability.
Claims10
A nucleated propylene-butylene-copolymer which
- i) has been produced in the presence of a Ziegler-Natta catalyst and is
- ii) free of phthalic acid esters, and comprises, based on the total weight of the propylene-butylene copolymer,
- A. 88.0-96.0 wt.-% of propylene;
- and
- B. 4.0-12.0 wt.-% of 1-butylene,
- wherein the nucleated propylene-butylene copolymer is further characterised by:
- a) a molecular weight distribution (MWD) of at least 5.0 when measured according to ISO16014,
- b) and fulfils any of the following requirements:
- c1) Flexural Modulus of at least 1000 MPa when measured according to ISO178 or
- c2) Notched Impact strength of at least 3.0 kJ/m2 when measured according to ISO 179/1eA+23° C. or
- c4) ratio of Flex Modulus/Haze of at least 60 MPa/% or
- c5) an optomechanical ability or a process focused optomechanical ability of at least 200.
9 more elements
Dependencies are inferred from the claim text.