Patent Description:
<CIT> describes compositions comprising a polymer and at least one compound carrying three amide functionalities.

It was an object of the present invention to provide polymer compositions showing improved mechanical properties, in particular an improved flexural (elastic) modulus, and at the same time improved haze and improved scratch resistance.

It was another object of the present invention to provide polymer compositions showing an improved scratch resistance.

These objects are solved by the composition of claim <NUM> and the use of claim <NUM>.

The composition of the present invention comprises.

The organic compound A carrying at least two amide functionalities is <NUM>,<NUM>,<NUM>-tris-[<NUM>,<NUM>-dimethylpropionylamino]benzene, sold under the tradename Ciba® Irgaclear® XT <NUM> by Ciba.

Compound B is selected from the group consisting of <NUM>,<NUM>:<NUM>,<NUM>-bis(<NUM>,<NUM>-dimethyl-benzylidene)sorbitol, metal salt of <NUM>,<NUM>'-methylene bis(<NUM>,<NUM>-di-tert-butylphenyl)phosphate, and zinc glycerolate. <NUM>,<NUM>:<NUM>,<NUM>-bis(<NUM>,<NUM>-dimethyl-benzylidene)sorbitol, is for example sold under the tradename Millad® <NUM> by Milliken.

Sodium <NUM>,<NUM>'-methylene bis(<NUM>,<NUM>-di-tert-butylphenyl)phosphate, is for example sold under the tradename Ciba® Irgastab® NA <NUM> by Ciba,.

Lithium <NUM>,<NUM>'-methylene-bis (<NUM>,<NUM>-di-tert-butylphenyl) phosphate, is for example sold under the tradename ADK Stab NA <NUM> by Adeka.

Aluminium-hydroxy-bis [<NUM>,<NUM>'-methylene-bis (<NUM>,<NUM>-di-tert-butylphenyl) phosphate, is for example sold under the tradename ADK Stab NA <NUM> by Adeka.

Zinc glycerolate, is for example sold under the tradename Ciba® Irgastab® NA <NUM> by Ciba.

The polymer is a polypropylene homopolymer or a polypropylene random copolymer, alternating or segmented copolymer or block copolymer containing one or more comonomers selected from the group consisting of ethylene, C<NUM>-C<NUM>-α-olefin, vinylcyclohexane, vinylcyclohexene, C<NUM>-C<NUM>alkandiene, C<NUM>-C<NUM>cycloalkandiene and norbornene derivatives; the total amount of propylene and the comonomer(s) being <NUM> %.

Polypropylene copolymer also covers long chain branched polypropylene copolymer.

Examples of suitable C<NUM>-C<NUM>-α-olefins are <NUM>-butene, <NUM>-pentene, <NUM>-hexene, <NUM>-heptene, <NUM>-octene, <NUM>-nonene, <NUM>-decene, <NUM>-undecene, <NUM>-dodecene, <NUM>-tetradecene, <NUM>-hexadecene, <NUM>-octadecene, <NUM>-eicosene and <NUM>-methyl-<NUM>-pentene.

Examples of suitable C<NUM>-C<NUM>alkandienes are hexadiene and octadiene.

Examples of suitable C<NUM>-C<NUM>cycloalkandienes are cyclopentadiene, cyclohexadiene and cyclooctadiene.

Examples of suitable norbornene derivatives are <NUM>-ethylidene-<NUM>-norbornene (ENB), dicyclopentadiene (DCP) and methylene-domethylene-hexahydronaphthaline (MEN).

A propylene random copolymer comprising ethylene is a preferred synthetic polymer. A propylene/ethylene copolymer contains for example <NUM> to <NUM>%, preferably <NUM> to <NUM>%, in particular <NUM> to <NUM>%, by weight of propylene.

A propylene copolymer wherein the comonomer is a C<NUM>-C<NUM>α-olefin such as e.g. <NUM>-nonene, <NUM>-decene, <NUM>-undecene, <NUM>-dodecene, <NUM>-tetradecene, <NUM>-hexadecene, <NUM>-octadecene or <NUM>-eicosene; C<NUM>-C<NUM>alkandiene, C<NUM>-C<NUM>cycloalkandiene or a norbornene derivative such as e.g. <NUM>-ethylidene-<NUM>-norbornene (ENB) or methylene-domethylene-hexahydronaphthaline (MEN) contains preferably more than <NUM> mol%, in particular <NUM> to <NUM> mol% or <NUM> to <NUM> mol%, of propylene.

A propylene copolymer wherein the comonomer is a C<NUM>-C<NUM>α-olefin such as e.g. <NUM>-butene, <NUM>-pentene, <NUM>-hexene, <NUM>-heptene, <NUM>-octene or <NUM>-methyl-<NUM>-pentene; vinylcyclohexane, vinylcyclohexene, C<NUM>-C<NUM>alkandiene or C<NUM>-C<NUM>cycloalkandiene contains preferably more than <NUM> mol %, in particular <NUM> to <NUM> mol % or <NUM> to <NUM> mol %, of propylene.

Additional materials can optionally be added to the compositions of the present invention in a concentration range that does not adversely affect the beneficial effects of the invention. These materials may include lubricants, stabilizers, antioxidants, antibacterial agents, ultraviolet absorbers, thermostabilizers, light stabilizers, neutralizers, antistatic agents, antiblocking agents, heavy metal inactivation agents, flame retardants, lubricants, peroxides, hydrotalcite, foaming agents, elastomers, processing aids, nucleating agents, fillers and the like and mixtures thereof. The amount of the additional materials may be <NUM> to <NUM>'<NUM> parts per million (ppm) based on the weight of the polymer.

Examples of fillers are fiber glass, natural fibers such as hemp and kenaf, and inorganic materials such as basalt, talc and wollastonite, (fibrous) magnesium oxysulfate, chalk, kaolin, clay, graphite, graphene, carbon black and other organic or inorganic pigments, titanium dioxide and silicon dioxide.

The composition of the present invention can comprise <NUM> to <NUM>, <NUM> tc <NUM> or <NUM> to <NUM> parts per million (ppm) of the organic compound A carrying at least two amide functionalities, based on the weight of the polymer.

The composition of the present invention comprises from <NUM> to <NUM> parts per million (ppm) of compound B, based on the weight of the polymer.

Also disclosed is a shaped article obtainable from the composition of the present invention.

The shaped article can be, for example, obtained from the composition of the present invention by injection blow molding, extrusion, blow molding, rotomolding, in mold decoration (back injection), slush molding, injection molding, co-injection molding, forming, compression molding, pressing, film extrusion (cast film; blown film), fiber spinning (woven, non-woven), drawing (uniaxial, biaxial), annealing, deep drawing, calendaring, mechanical transformation, sintering, coextrusion, coating, lamination, crosslinking (radiation, peroxide, silane), vapor deposition, weld together, glue, vulkanization, thermoforming, pipe extrusion, profile extrusion, sheet extrusion; sheet casting, spin coating, strapping, foaming, recycling / rework, extrusion coating, visbreaking (peroxide, thermal), fiber melt blown, spun bonded, surface treatment (corona discharge, flame, plasma), sterilization (by gamma rays, electron beams), gel-coating, tape extrusion, SMC-process or plastisol.

A molded article is preferred. The molding is in particular affected by injection, blow, compression, roto-molding or slush-molding or extrusion.

Examples of shaped article are film fibers, profiles, pipes, bottles, tanks and containers.

The polymer is a polypropylene homopolymer or a polypropylene random copolymer, alternating or segmented copolymer or block copolymer containing one or more comonomers selected from the group consisting of ethylene, C<NUM>-C<NUM>-α-olefin, vinylcyclohexane, vinylcyclohexene, C<NUM>-C<NUM>alkandiene, C<NUM>-C<NUM>cycloalkandiene and norbornene derivatives; the total amount of propylene and the comonomer(s) being <NUM>%.

Also part of the invention is the use of a mixture consisting of.

The definitions and preferences given above for an organic compound A carrying at least two amide functionalities apply accordingly.

The polymer compositions of the present invention show improved flexural (elastic) modulus, and at the same time an improved scratch resistance and an improved haze.

The polymer compositions of the present invention show improved scratch resistance.

Polymer compositions comprising <NUM>,<NUM>,<NUM>-tris[<NUM>,<NUM>-dimethylpropionylamino]benzene, for example as sold under the tradename Ciba® Irgaclear® XT <NUM> by Ciba, as compound A, and <NUM>,<NUM>:<NUM>,<NUM>-bis(<NUM>,<NUM>-dimethylbenzylidene)sorbitol, for example as sold under the tradename Millad® <NUM> by Milliken, as compound B show an improved scratch resistance and at the same time improved transparency.

Examples <NUM> to <NUM> (examples <NUM>, <NUM> and <NUM> are reference examples) and comparative examples <NUM> to <NUM>.

The nucleating agents and mixtures of nucleating agents as indicated in table <NUM> are mixed with dry powder form polypropylene (PP), random copolymer comprising <NUM> mole% ethylene (RD <NUM> CF from Borealis AG, Vienna, Austria) in a high speed mixer (Mixaco Lab CM <NUM>) and are compounded at <NUM> ° C to pellets in a twin-extruder (Berstorff ZE <NUM> X <NUM> D). Polypropylene (PP) random copolymer without nucleating agents is treated analogously (comparative example <NUM>).

dHyperform® HPN-<NUM> (Milliken) is a blend of the following compounds: <NUM>% by weight cis-endo-bicyclo[<NUM>. <NUM>]heptane-<NUM>,<NUM>-dicarboxylic acid, disodium salt, <NUM>% by weight (Z)-<NUM>-docosenamide and <NUM>% by weight amorphous silicon dioxide. eCiba® Irgastab® NA <NUM> is zinc glycerolate. fCiba® Irgastab® NA <NUM> is sodium benzoate. gCiba® Irgaclear® XT <NUM> is <NUM>,<NUM>,<NUM>-tris[<NUM>,<NUM>-dimethylpropionylamino]benzene.

The pellets of examples <NUM> to <NUM>, <NUM> to <NUM> and <NUM>, and comparative examples <NUM> to <NUM>, <NUM>, <NUM> and <NUM> to <NUM>, <NUM> and <NUM> are injection molded at <NUM> ° C to obtain <NUM> thick bars of <NUM> width and <NUM> length.

The bars are subjected to a "<NUM>-point bending test" according to ISO <NUM>. The flexural modulus or elastic modulus (Ef) is determined from the linear regime of the stress-strain curves. The flexural or elastic modulus is a measure of the stiffness of the polymer material. The results are outlined in table <NUM>.

As can be seen from table <NUM> polypropylene copolymer compositions comprising <NUM> ppm Hyperform® HPN-<NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>) show an improved (higher) flexural (elastic) modulus, namely <NUM> MPa, compared with the polypropylene copolymer compositions comprising <NUM> ppm Hyperform® HPN-<NUM> (flexural modulus = <NUM> MPa, comparative example <NUM>) or <NUM> ppm Ciba® Irgaclear® XT <NUM> (flexural modulus = <NUM> MPa, comparative example <NUM>). The effect is not of additive nature, but synergistic as can be seen when comparing the measured flexural (elastic) modulus (<NUM> MPa) with the calculated flexural (elastic) modulus (<NUM> MPa).

Table <NUM> shows the same effect regarding the flexural (elastic) modulus of the polypropylene copolymer compositions comprising <NUM> ppm Hyperform® HPN-<NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), <NUM> ppm Ciba® Irgastab® NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), respectively, <NUM> ppm Ciba® Irgastab® NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>).

The pellets of examples <NUM> to <NUM>, <NUM> to <NUM>, and <NUM>, and comparative examples <NUM> to <NUM> and <NUM> to <NUM> are molded at <NUM> ° C to plaques with a thickness of <NUM> using a standard injection molding machine (Engel HL <NUM>).

The hazes the plaques are analysed using a Haze-gard plus instrument (BYK Gardner Gmbh Germany) in accordance with ASTM standard D1003. In this test, haze is commonly defined as that portion of visible light that is scattered at wider angles (<NUM>° <θ<<NUM>° ) and is a measure for the turbidity of a sample.

The results are outlined in table <NUM>.

For example the calculated Haze of <NUM> ppm of a mixture of <NUM>% Hyperform® HPN-<NUM> and <NUM>% Ciba® Irgaclear® XT <NUM> (example <NUM>) = <NUM>% x "Haze of <NUM> ppm Hyperform® HPN-<NUM>" + <NUM>% x "Haze of <NUM> ppm Ciba® Irgaclear® XT <NUM>" = <NUM>% x <NUM> + <NUM>% x <NUM> = <NUM>.

As can be seen from table <NUM> polypropylene copolymer compositions comprising <NUM> ppm Millad® <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>) show an improved (lower) haze, namely <NUM>, compared with the polypropylene copolymer compositions comprising <NUM> ppm Millad® <NUM> (haze = <NUM>, comparative example <NUM>) or <NUM> ppm Ciba® Irgaclear® XT <NUM> (haze = <NUM>, comparative example <NUM>). The effect is not of additive nature, but synergistic as can be seen when comparing the measured haze (<NUM>) with the calculated haze (<NUM>).

Table <NUM> shows the same effect regarding haze of the polypropylene copolymer compositions comprising <NUM> ppm Millad® <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), <NUM> ppm Ciba® Irgastab® NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), <NUM> ppm Ciba® Irgastab® NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), <NUM> ppm Hyperform® HPN-<NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), <NUM> ppm Hyperform® HPN-<NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), <NUM> ppm Ciba® Irgastab® NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), respectively, <NUM> ppm Ciba® Irgastab® NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>).

The pellets of examples <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM>, and comparative examples <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and <NUM> are molded at <NUM> ° C to plaques with a thickness of <NUM> using a standard injection molding machine (Engel HL <NUM>). The scratch resistance of the plaques is analysed with an Erichson Sratch Tester by moving a sharp tip of <NUM> radius over the plaques at a velocity of <NUM>/min and a normal force of <NUM> N. Evaluation of the scratch resistance is assessed by visual inspection as the transparent or translucent nature of the samples prevented changes in L* to be determined. The results are outlined in table <NUM>. The transparency is also analysed by visual inspection. The results are also outlined in table <NUM>.

As can be seen from table <NUM>, polypropylene copolymer compositions comprising <NUM> ppm Millad® <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>),<NUM> ppm Millad® <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), <NUM> ppm Ciba® Irgastab® NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), <NUM> ppm Hyperform® HPN-<NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), 150ppm Ciba® Irgastab® NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), respectively, <NUM> ppm Ciba® Irgastab® NA 04and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>) all show a high scratch resistance. The polypropylene copolymer compositions comprising <NUM> ppm Millad® <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), respectively, <NUM> ppm Millad® <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>) also show a high transparency.

The nucleating agents and mixtures of nucleating agents as indicated in table <NUM> are mixed with dry powder form polypropylene (PP) random copolymer comprising <NUM> mole% ethylene (RD <NUM> MFI <NUM> from Borealis AG, Vienna, Austria) in a high speed mixer (Mixaco Lab CM <NUM>) and are compounded at <NUM> ° C to pellets in a twin-extruder (Berstorff ZE <NUM> X <NUM> D).

kADK Stab NA <NUM> (Adeka) is a mixture of <NUM>% aluminium-hydroxy-bis [<NUM>,<NUM>'-methylene-bis (<NUM>,<NUM>-di-tert-butylphenyl) phosphate] and <NUM>% lithium myristate.

The pellets of examples <NUM> to <NUM>, and comparative examples <NUM> to <NUM> are injection molded at <NUM> ° C to obtain <NUM> thick bars of <NUM> width and <NUM> length.

For example the calculated flexural (elastic) modulus of <NUM> ppm of a mixture of <NUM>% ADK Stab NA <NUM>j and <NUM>% Ciba® Irgaclear® XT <NUM> (example <NUM>) = <NUM>% x "flexural (elastic) modulus of <NUM> ppm ADK Stab NA <NUM>j" + <NUM>% x "flexural (elastic) modulus of <NUM> ppm Ciba® Irgaclear® XT <NUM>" = <NUM>% x <NUM> + <NUM>% x <NUM> = <NUM>.

As can be seen from table <NUM> polypropylene copolymer compositions comprising <NUM> ppm ADK Stab NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>) show an improved (higher) flexural (elastic) modulus, namely <NUM> MPa, compared with the polypropylene copolymer compositions comprising <NUM> ppm ADK Stab NA <NUM> (flexural modulus = <NUM> MPa, comparative example <NUM>) or <NUM> ppm Ciba® Irgaclear® XT <NUM> (flexural modulus = <NUM> MPa, comparative example <NUM>). The effect is not of additive nature, but synergistic as can be seen when comparing the measured flexural (elastic) modulus (<NUM> MPa) with the calculated flexural (elastic) modulus (<NUM> MPa).

Table <NUM> shows the same effect regarding the flexural (elastic) modulus of the polypropylene copolymer compositions comprising <NUM> ppm ADK Stab NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), respectively, <NUM> ppm ADK Stab NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>).

The pellets of examples <NUM> to <NUM>, and comparative examples <NUM> to <NUM> are molded at <NUM> ° C to plaques with a thickness of <NUM> using a standard injection molding machine (Arburg <NUM>).

For example the calculated Haze of <NUM> ppm of a mixture of <NUM>% ADK Stab NA <NUM> and <NUM>% Ciba® Irgaclear® XT <NUM> (example <NUM>) = <NUM>% x "Haze of <NUM> ADK Stab NA <NUM>" + <NUM>% x "Haze of <NUM> ppm Ciba® Irgaclear® XT <NUM>" = <NUM>% x <NUM> + <NUM>% x <NUM> = <NUM>.

As can be seen from table <NUM> polypropylene copolymer compositions comprising <NUM> ppm ADK Stab NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>) show an improved (lower) haze, namely <NUM>, compared with the polypropylene copolymer compositions comprising <NUM> ppm ADK Stab NA <NUM> (haze = <NUM>, comparative example <NUM>) or <NUM> ppm Ciba® Irgaclear® XT <NUM> (haze = <NUM>, comparative example <NUM>). The effect is not of additive nature, but synergistic as can be seen when comparing the measured haze (<NUM>) with the calculated haze (<NUM>).

Table <NUM> shows the same effect regarding haze of the polypropylene copolymer compositions comprising <NUM> ppm ADK Stab NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), respectively, <NUM> ppm ADK Stab NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>).

The nucleating agents and mixtures of nucleating agents as indicated in table <NUM> are mixed with dry powder form polypropylene (PP) homopolymer (Moplen HP 500N, MFI <NUM>) in a high speed mixer (Mixaco Lab CM <NUM>) and are compounded at <NUM> ° C to pellets in a twin-extruder (Berstorff ZE <NUM> X <NUM> D).

The pellets of examples <NUM> to <NUM>, and comparative examples <NUM> to <NUM> are injection molded at <NUM> ° C (Arburg <NUM>) to obtain <NUM> thick bars of <NUM> width and <NUM> length.

For example the calculated flexural (elastic) modulus of <NUM> ppm of a mixture of <NUM>% ADK Stab NA <NUM> and <NUM>% Ciba® Irgaclear® XT <NUM> (example <NUM>) = <NUM>% x "flexural (elastic) modulus of <NUM> ppm ADK Stab NA <NUM>" + <NUM>% x "flexural (elastic) modulus of <NUM> ppm Ciba® Irgaclear® XT <NUM>" = <NUM>% x <NUM> + <NUM>% x <NUM> = <NUM>.

As can be seen from table <NUM> polypropylene homopolymer compositions comprising <NUM> ppm ADK Stab NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>) show an improved (higher) flexural (elastic) modulus, namely <NUM> MPa, compared with the polypropylene homopolymer compositions comprising <NUM> ppm ADK Stab NA <NUM> (flexural modulus = <NUM> MPa, comparative example <NUM>) or <NUM> ppm Ciba® Irgaclear® XT <NUM> (flexural modulus = <NUM> MPa, comparative example <NUM>). The effect is not of additive nature, but synergistic as can be seen when comparing the measured flexural (elastic) modulus (<NUM> MPa) with the calculated flexural (elastic) modulus (<NUM> MPa).

Table <NUM> shows the same effect regarding the flexural (elastic) modulus of the polypropylene homopolymer compositions comprising <NUM> ppm ADK Stab NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), <NUM> ppm ADK Stab NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), respectively, <NUM> ppm ADK Stab NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>).

As can be seen from table <NUM> polypropylene homopolymer compositions comprising <NUM> ppm ADK Stab NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>) show an improved (lower) haze, namely <NUM>, compared with the polypropylene homopolymer compositions comprising <NUM> ppm ADK Stab NA <NUM> (haze = <NUM>, comparative example <NUM>) or <NUM> ppm Ciba® Irgaclear® XT <NUM> (haze = <NUM>, comparative example <NUM>). The effect is not of additive nature, but synergistic as can be seen when comparing the measured haze (<NUM>) with the calculated haze (<NUM>).

Table <NUM> shows the same effect regarding haze of the polypropylene homopolymer compositions comprising <NUM> ppm ADK Stab NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), <NUM> ppm ADK Stab NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>), respectively, <NUM> ppm ADK Stab NA <NUM> and <NUM> ppm Ciba® Irgaclear® XT <NUM> (example <NUM>).

The mixtures of nucleating agents as indicated in table <NUM> are mixed with dry powder form polypropylene (PP) random copolymer comprising <NUM> mole% ethylene (RD <NUM> CF from Borealis AG, Vienna, Austria) in a high speed mixer (Mixaco Lab CM <NUM>). Under constant nitrogen purge, the mixture is then intensely melt-compounded at <NUM> ° C for <NUM> minutes at <NUM> rpm screw speed using a co-rotating laboratory twin-screw extruder (<NUM><NUM> Micro-Compounder of DSM Xplore). The homogeneous melt is subsequently transferred to a <NUM><NUM> Micro-Injector (DSM Xplore), where the melt is injected into a polished mold at a pressure of about <NUM> bars at <NUM> ° C mold temperature. The resulting circular disks have a diameter of <NUM> and a thickness of <NUM>.

The hazes the plaques are analysed using a Haze-gard plus instrument (BYK Gardner Gmbh Germany) at room temperature in accordance with ASTM standard D1003. All haze values are measured at least <NUM> hours after injection molding.

Claim 1:
A composition comprising
(i) a polymer, wherein the polymer is a polypropylene homopolymer or a polypropylene random copolymer, alternating or segmented copolymer or block copolymer containing one or more comonomers selected from the group consisting of ethylene, C<NUM>-C<NUM>-α-olefin, vinylcyclohexane, vinylcyclohexene, C<NUM>-C<NUM>alkandiene, C<NUM>-C<NUM>cycloalkandiene and norbornene derivatives; the total amount of propylene and the comonomer(s) being <NUM> %,
(ii) <NUM> to <NUM> parts per million (ppm) of an organic compound A carrying at least two amide functionalities which is <NUM>,<NUM>,<NUM>-tris[<NUM>,<NUM>-dimethylpropionylamino]benzene, basec on the total weight of the polymer, and
(iii) <NUM> to <NUM> parts per million (ppm) of a compound B selected from the group consisting of <NUM>,<NUM>:<NUM>,<NUM>-bis(<NUM>,<NUM>-dimethylbenzylidene)sorbitol, metal salt of <NUM>,<NUM>'-methylene bis(<NUM>,<NUM>-di-tert-butylphenyl)phosphate, and zinc glycerolate, based on the weight of the polymer.