num="0074">In some embodiments and in terms of optical properties the polypropylene composition shows a haze level below 30%, alternatively below 25%, alternatively below 20%.

In some embodiments, the polypropylene composition is obtained by mechanical blending of components (a)-(b) and optionally further components and additives.

In some embodiments, the process of making the polypropylene composition use a co-rotating twin screw tandem extruder to which the components (a-b) and optionally further components and additives are added.

In some embodiments, the additives are added in a reclaim extruder (first extruder) and a compounding extruder (second extruder) of a tandem extruder.

In some embodiments, the polypropylene composition is prepared in granule or flake form, for use in manufacturing articles.

In some embodiments, the polypropylene composition is used in the manufacturing of extruded or thermoformed articles. In some embodiments, the polypropylene polymer composition is used for manufacturing blow molded articles, alternatively bottles. In some embodiments, the present disclosure provides an article of manufacture made from or containing the polypropylene composition. In some embodiments, the article is selected from the group consisting of extruded articles and thermoformed articles. In some embodiments, the article is blow-molded.

The following examples are given to illustrate, but not limit the present disclosure.

EXAMPLES

Characterizations

Xylene-Soluble (XS) Fraction at 25° C.

2.5 g of polymer and 250 ml of xylene were introduced into a glass flask equipped with a refrigerator and a magnetic stirrer. The temperature was raised in 30 minutes up to the boiling point of the solvent. The resulting clear solution was then kept under reflux and stirred for 30 minutes. The closed flask was then kept for 30 minutes in a bath of ice and water, then in a thermostatic water bath at 25° C. for 30 minutes. The resulting solid was filtered on quick filtering paper. 100 ml of the filtered liquid were poured into a pre-weighed aluminum container, which was heated on a heating plate under nitrogen flow, thereby removing the solvent by evaporation. The container was then kept in an oven at 80° C. under vacuum until a constant weight was obtained. The weight percentage of polymer soluble in xylene at room temperature was then calculated.

The content of the xylene-soluble fraction is expressed as a percentage of the original 2.5 grams and then, by the difference (complementary to 100%), the xylene insoluble percentage (%); XS of components B) and C) were calculated by using the formula:

XStot=WaXSA+WbXSB+WcXSC

wherein Wa, Wb and We were the relative amount of components A, B and C, respectively, and (A+B+C=1).

Melt Flow Rate (MFR)

Measured according to ISO 1133 at 230° C. with a load of 2.16 kg, unless otherwise specified.

Intrinsic Viscosity (IV)

The sample was dissolved in tetrahydronaphthalene at 135° C. and then poured into a capillary viscometer. The viscometer tube (Ubbelohde type) was surrounded by a cylindrical glass jacket; this setup allowed for temperature control with a circulating thermostatic liquid. The downward passage of the meniscus was timed by a photoelectric device.

The passage of the meniscus in front of the upper lamp started the counter which had a quartz crystal oscillator. The counter stopped as the meniscus passed the lower lamp. The efflux time was registered and converted into a value of intrinsic viscosity through Huggins' equation (Huggins, M. L., J. Am. Chem. Soc., 1942, 64, 2716), using the flow time of the pure solvent at the same experimental conditions (same viscometer and same temperature). A single polymer solution was used to determine [η].

Ethylene (C₂) Content

¹³C NMR of Propylene/Ethylene Copolymers

¹³C NMR spectra were acquired on a Bruker AV-600 spectrometer equipped with cryoprobe, operating at 160.91 MHz in the Fourier transform mode at 120° C.

The peak of the S_ββ carbon (nomenclature according to “Monomer Sequence Distribution in Ethylene-Propylene Rubber Measured by 13C NMR. 3. Use of Reaction Probability Mode” C. J. Carman, R. A. Harrington and C. E. Wilkes, Macromolecules, 1977, 10, 536) was used as internal standard at 29.9 ppm. The samples were dissolved in 1,1,2,2-tetrachloroethane-d2 at 120° C. with an 8% wt/v concentration. Each spectrum was acquired with a 90° pulse, 15 seconds of delay between pulses and CPD, thereby removing 1H-13C coupling. 512 transients were stored in 32K data points using a spectral window of 9000 Hz.

The assignments of the spectra, the evaluation of triad distribution and the composition were made according to Kakugo (“Carbon-13 NMR determination of monomer sequence distribution in ethylene-propylene copolymers prepared with 6-titanium trichloride-diethylaluminum chloride” M. Kakugo, Y. Naito, K. Mizunuma and T. Miyatake, Macromolecules, 1982, 15, 1150) using the following equations:

$\begin{matrix} PPP = 100 T_{ββ} / S & PPE = 100 T_{βδ} / S & EPE = T_{δδ} / S \end{matrix}$

$\begin{matrix} PEP = 100 S_{ββ} / S & PEE = 100 S_{βδ} / S & EEE = 100 (0.25 S_{γδ} + 0.5 S_{δδ}) / S \end{matrix}$

S
=

T
ββ

+

T
βδ

+