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1. (WO2019048529) PROCESS FOR PREPARING POLYPROPYLENE COMPOSITION
注意: このテキストは、OCR 処理によってテキスト化されたものです。法的な用途には PDF 版をご利用ください。

Claims

1. Process for producing a polypropylene composition by sequential

polymerization comprising the steps:

a) polymerizing in a first reactor, preferably a slurry reactor, monomers comprising propylene and one or more comonomers selected from C4-C10 alpha-olefins, to obtain a first propylene polymer fraction having a comonomer content in the range of from 2.0 to 8.0 mol%,

b) polymerizing in a second reactor, preferably a first gas-phase reactor,

monomers comprising propylene and one or more comonomers selected from ethylene and C4-C10 alpha-olefins, in the presence of the first propylene polymer fraction, to obtain a second propylene polymer fraction,

c) polymerizing in a third reactor, preferably a second gas-phase reactor,

monomers comprising propylene and one or more comonomers selected from ethylene and optionally C4-C10 alpha-olefins, in the presence of the second propylene polymer fraction, to obtain a polypropylene composition having an ethylene comonomer content in the range of from 0.5 to 5.0 mol% and a C4-C10 alpha-olefin comonomer content in the range of from 3.0 to 10.0 mol%, relative to the total amount of monomers present in the polypropylene composition.

2. The process according to claim 1, wherein the second propylene polymer

fraction has an ethylene comonomer content in the range of from 0.S to S.O mol% and a C4-C10 alpha olefins comonomer content in the range of from 3.0 to 9.0 mol%, relative to the total amount of monomers present in the second propylene polymer fraction.

3. The process according to any one of the preceding claims, wherein the

polymerization in the first reactor is carried out at a temperature in the range of from 62 to 85°C.

4. The process according to any one of the preceding claims, wherein the polymerization is carried out in the presence of a Ziegler-Natta catalyst, preferably a Ziegler-Natta catalyst which is free of a phthalic compound.

5. The process according to any one of the preceding claims, wherein the process is operated in the presence of a Ziegler-Natta catalyst with a transition metal of group 4 to 6 of the periodic table, the catalyst comprising an internal donor, optionally a co-catalyst and optionally an external donor, wherein the internal donor is a non-phthalic internal donor.

6. The process according to claim 5, wherein the non-phthalic internal donor is selected from (di)esters of non-phthalic carboxylic (di)acids wherein the (di)ester belongs to the group comprising malonates, maleates, succinates, citraconates, glutarates, cyclohexene- 1 ,2-dicarboxylates and benzoates and derivatives thereof or mixtures thereof.

7. The process according to any one of the preceding claims, wherein the

polypropylene composition has an MFR2 in the range of from 3 to 1210lOmin, as measured at 230 °C under a load of 2.16 kg according to ISO 1133.

8. The process according to any one of the preceding claims, wherein the process is carried out in the absence of an anti-fouling agent.

9. A polypropylene composition having an ethylene comonomer content in the range of from 0.5 to 5.0 mol% and a C4-C10 alpha olefins comonomer content in the range of from 3.0 to 10.0 mol%, relative to the total amount of monomers present in the polypropylene composition and, wherein the polypropylene composition has an MFR2 in the range of from 3 to 12 g/1 Ornin, as measured at 230 °C under a load of 2.16 kg according to ISO 1133.

10. The polypropylene composition according to claim 9, wherein the polypropylene composition satisfies the equation:

Delta =Tm- SIT

wherein Delta is a temperature in the range of from 30 to 45 °C,

Tm is the melting temperature, in °C, of the polypropylene composition, SIT is the sealing initiation temperature, in °C, of the polypropylene

composition.

11. The polypropylene composition according to any one of claims 9 to 10, wherein the polypropylene composition has one or more comonomers selected from ethylene and 1-butene.

12. The polypropylene composition according to any one of claims 9 to 11, wherein the polypropylene composition has a melting temperature in the range of from

135 to l60°C.

13. An article comprising the polypropylene composition according to any one of claims 9 to 12.

14. The article according to claim 13, wherein said article is a film or a multilayer film.