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1. WO2019121701 - COMPOSITION DE POLYPROPYLÈNE POUR RUBANS

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1 . Polypropylene composition comprising a propylene homopolymer or propylene-ethylene copolymer having an ethylene content of at most 1.0 wt% based on the propylene-ethylene copolymer

wherein the amount of propylene homopolymer or propylene-ethylene copolymer is at least 98wt%, for example at least 98.5wt%, preferably at least 99wt%, more preferably at least 99.5, for example at least 99.75wt% based on the polypropylene composition wherein the polypropylene composition has

- a melt flow rate in the range of 0.70 to 2.4 dg/min as measured according to IS01 133 (2.16 kg/230°C)

- an Mw/Mn in the range from 7.0 to 13.0, preferably from 8.0 to 13.0, wherein Mw stands for the weight average molecular weight and Mn stands for the number average weight

- an Mz/Mn is in the range from 20 to 50, wherein Mz stands for the z-average molecular weight

and wherein Mw, Mn and Mz are measured according to ASTM D6474-12.

2. Polypropylene composition according to claim 1 having a melt flow rate in the range of 0.70 to 2.3dg/min as measured according to IS01 133 (2.16 kg/230°C).

3. Polypropylene composition according to claim 1 or claim 2, wherein the composition has an amount of xylene soluble amount (XS) as measured according to ASTM D 5492-10 in the range from 0.5 to 3.5 wt%.

4. Polypropylene composition according to any of claims 1 -3, wherein the composition has a pentad isotacticity of at least 94 % and preferably at most 98 % based on the composition, wherein the isotacticity is determined using 13C NMR.

5. Polypropylene composition according to any one of claims 1 -4, wherein the composition has a MWD divided by the gelcount 500 of at least 0.9

wherein MWD is calculated by dividing the weight average molecular weight (Mw) by the number average molecular weight (Mn) and wherein Mw and Mn are measured according to ASTM D6474-12 and wherein the gelcount 500 stands for the gelcount all particles having an equivalent diameter of at least 500pm.

6. Polypropylene composition according to any one of claims 1 -5, wherein the composition is unimodal.

7. Polypropylene composition according to any one of claims 1 -6, further comprising additives, and wherein sum of the amount of additives and the amount of propylene homopolymer or propylene-ethylene copolymer is 100wt% based on the polypropylene composition.

8. Polypropylene composition according to any one of claims 1 -7 having a flexural modulus in parallel orientation of at least 1800MPa, preferably at least 1850MPa, more preferably at least 1900MPa as measured according to ASTM D790-10.

9. Polypropylene composition according to any one of claims 1 -8 having has an Izod notched impact strength in parallel orientation of at least 2.5, preferably at least 3.0 kJ/m2 as measured at 23°C according to ISO 180 4A.

10. Polypropylene composition according to any one of claims 1 -9 has an Mz/Mw is in the range from 2.7 to 4.5.

11 . Tapes, including strapping tapes prepared from the polypropylene composition of any one of claims 1 -10.

12. Use of the polypropylene composition of any one of claims 1 -10 for the preparation of tapes, including strapping tapes.

13. Process for the preparation of the tapes of claim 1 1 comprising the step of providing the polypropylene composition of any one of claims 1 -10.

14. Process for the preparation of the polypropylene composition of any one of claims 1 -10, comprising the step of

polymerizing propylene and optional ethylene comonomers in the presence of a catalyst, preferably in the gas phase to obtain the propylene homopolymer or the propylene-ethylene copolymer, wherein said catalyst is obtainable by a process comprising the steps of

A) providing a Ziegler-Natta procatalyst, wherein step (A) of providing the Ziegler-Natta procatalyst comprises the steps of contacting a magnesium-containing support with

i) a halogen-containing titanium compound,

ii) ethylbenzoate as an activator,

iii) and as internal donor an aminobenzoate compound according to formula B:


wherein each R90 group is independently a substituted or unsubstituted aromatic group; R91 , R92, R93, R94, R95, and R96 are each independently selected from a hydrogen or a linear, branched or cyclic hydrocarbyl group, selected from alkyl, alkenyl, aryl, aralkyl, or alkylaryl groups, and one or more combinations thereof, preferably having from 1 to 20 carbon atoms; R97 is a hydrogen or a linear, branched or cyclic hydrocarbyl group, selected from alkyl, alkenyl, aryl, aralkyl, alkoxycarbonyl or alkylaryl groups, and one or more combinations thereof, preferably having from 1 to 20 carbon atoms; N is a nitrogen atom; O is an oxygen atom; and C is a carbon atom; preferably 4-[benzoyl(methyl)amino]pentan-2-yl benzoate (AB); and

B) contacting said Ziegler-Natta procatalyst obtained in step A) with a co catalyst and at least one external electron donor to obtain said catalyst;

preferably wherein step A) to provide the Ziegler-Natta procatalyst comprises the following steps:

i) contacting a compound R4zMgX42-z with an alkoxy- or aryloxy-containing silane compound to give a first intermediate reaction product, being a solid Mg(OR1 )xX12-x, wherein: R4 and R1 are each a linear, branched or cyclic hydrocarbyl group independently selected from alkyl, alkenyl, aryl, aralkyl, alkoxycarbonyl or alkylaryl groups, and one or more combinations thereof; wherein said hydrocarbyl group may be substituted or unsubstituted, may contain one or more heteroatoms and preferably has from 1 to 20 carbon atoms; X4 and X1 are each independently selected from the group of consisting of fluoride (F-), chloride (CI-), bromide (Br-) or iodide (I-), preferably chloride; z is in a range of larger than 0 and smaller than 2, being 0 < z < 2, x is in a range of larger than 0 and smaller than 2, being 0 < x < 2;

ii) optionally contacting the solid Mg(OR1)xX12-x obtained in step ii) with at least one activating compound selected from the group formed of activating electron donors and metal alkoxide compounds of formula M1(OR2)v-w(OR3)w or M2(OR2)v w(R3)w, to obtain a second intermediate product; wherein M1 is a metal selected from the group consisting of Ti, Zr, Hf, Al or Si; M2 is a metal being Si; v is the valency of M1 or M2 and is either 3 or 4; w < v; R2 and R3 are each a linear, branched or cyclic hydrocarbyl group independently selected from alkyl, alkenyl, aryl, aralkyl, alkoxycarbonyl or alkylaryl groups, and one or more combinations thereof; wherein said hydrocarbyl group may be substituted or unsubstituted, may contain one or more heteroatoms, and preferably has from 1 to 20 carbon atoms;

iii) contacting the first or second intermediate reaction product, obtained respectively in step i) or ii), with the halogen-containing Ti-compound; the activator; and the internal electron donor to obtain said Ziegler-Natta procatalyst;

15. Process according to claim 14, wherein as external donor in step B) a phthalate free donor, for example di(isopropyl) dimethoxysilane is used.