Nucleated propylene-ethylene-butylene terpolymers and moulded articles made thereof
The present invention relates to nucleated propylene-ethylene-butylene-terpolymers comprising propylene, butylene, and ethylene, having improved stiffness, better impact behaviour and improved optical properties such as low haze, and low amounts of soluble or extractable fractions.
1. A nucleated propylene-ethylene-butylene-terpolymer 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-ethylene-butylene terpolymer—
A. 83.0-98.9 wt.-%, of propylene
B. 1.0-12.0 wt.-% of 1-butylene and
C. 0.1-5.0 wt.-% ethylene
wherein the nucleated propylene-ethylene-butylene terpolymer is further characterized by having an amount of fractions soluble in xylene (XCS) of below 5.0 wt.-% when measured according to ISO 16152; 5 th edition and fulfills the following requirements:
a) Flexural Modulus>850 MPa when measured according to ISO178 and
b) Notched Impact strength>5.0 kJ/m 2 when measured according to ISO 179/1eA+23° C.
2. A nucleated propylene-ethylene-butylene-terpolymer according to claim 1 , further characterised by an MFR230/2.16 of >=3.0 g/10 min when measured according to ISO 1133.
3. A nucleated propylene-ethylene-butylene-terpolymer according to claim 1 , further characterised by having Haze of <16.0% when measured on 1 mm plaques, according to ASTM1003.
4. A nucleated propylene-ethylene-butylene-terpolymer according to claim 1 , further characterised by having a ratio of Flex Modulus/Haze of at least 80 MPa/%.
5. A nucleated propylene-ethylene-butylene-terpolymer according to claim 1 , further characterised by a optomechanical ability of at least 400 (kJ*MPa)/(m 2 .%).
6. A nucleated propylene-ethylene-butylene-terpolymer according to claim 1 further characterised by fulfilling any two of the following requirements:
Haze <16.0% when measured according to ASTM 1003-D on 1 mm plaques or
ratio of Flex Modulus/Haze of at least 80 MPa/% or
an optomechanical ability of at least 400.
7. A nucleated propylene-ethylene-butylene-terpolymer according to claim 1 , comprising 3.5-12.0 wt.-% 1-butylene.
8. A nucleated propylene-ethylene-butylene-terpolymer according to claim 1 , comprising 0.5- 1.5 wt.-% of ethylene.
9. A nucleated propylene-ethylene-butylene terpolymer according to claim 1 , which has been produced in the presence of a Ziegler-Natta catalyst and an internal donor selected from (di)esters of non-phthalic carboxylic (di)acids, 1,3-diethers, and mixtures thereof.
10. Moulded article comprising the nucleated propylene-ethylene-butylene terpolymer according to claim 1 .