POLYETHYLENE AND THE METHOD OF ITS PRODUCTION

Claims

1. Polyethylene that meets the following conditions: the value of the integral in the region where log Mw is 5.0 or greater, on a GPC curve plotted with x-axis log Mw and y-axis dw / dlogMw, is 60% or greater of the value of the entire integral, the molecular weight distribution (Mw / Mn) is 7 or greater, and the weight average molecular weight is 300,000 g / mol or more.

2. The polyethylene of claim 1, wherein the polyethylene comprises an ethylene homopolymer or an ethylene / alpha-olefin copolymer.

3. The polyethylene of claim 1, wherein the polyethylene has an integral value in the region where log Mw is 5.0 or greater on a GPC curve graph having an x-axis log Mw and a y-axis dw / dlogMw of 60% or greater and less than 90% of the value of the entire integral.

4. The polyethylene of claim 1, wherein the polyethylene has an integral value in the region where log Mw is 4.0 or less on a GPC curve graph having an x-axis log Mw and a y-axis dw / dlogMw of 20% or less and 10% or more of the value of the entire integral.

5. Polyethylene according to claim 1, wherein the polyethylene has a molecular weight distribution (Mw / Mn) from 7 to 13.

6. Polyethylene according to claim 1, wherein the polyethylene has a weight average molecular weight of from 300,000 to 1,000,000 g / mol.

7. Polyethylene according to claim 1, wherein the polyethylene has a melt index (MI) 2,16 ), measured at 190°C under a load of 2.16 kg according to ASTM D 1238, from 0.1 to 0.7 g / 10 min.

8. The polyethylene of claim 1, wherein the polyethylene has a melt flow index (MI) ratio 21,6 / MI 2,16 ), measured at 190°C according to ASTM D 1238, from 40 to 80.

9. Polyethylene according to claim 1, wherein the polyethylene has a density of 0.940 to 0.957 g / cm 3 .

10. The polyethylene of claim 1, wherein the polyethylene has an environmental stress crack resistance (ESCR) measured according to ASTM D 1693 of 120 hours or more.

11. The polyethylene of claim 1, wherein the polyethylene has a notched constant ligament-stress (NCLS) strength, measured according to ASTM F 2136, of 11.5 hours or greater.

12. A method for producing polyethylene according to any one of paragraphs 1-11, comprising the step of polymerizing ethylene in the presence of a catalyst containing at least one first metallocene compound represented by the following chemical formula 1; at least one second metallocene compound represented by the following chemical formula 2; and at least one third metallocene compound represented by the following chemical formula 3: [Chemical formula 1] , in chemical formula 1, at least one of the substituents R1-R8 is -(CH2) n -OR, where R is a linear or branched C 1-6 -alkyl, and n is an integer from 2 to 6; the remaining substituents R1-R8 are the same or different from each other and each independently represents a functional group selected from the group consisting of a hydrogen atom, a halogen atom, C 1-20 -alkyl, C 2-20 -alkenyl, C 6-20 -aryl, C 7-40 -alkylaryl and C 7-40 -arylalkyl, or two or more of the remaining substituents R1-R8, located adjacent to each other, can be connected to each other to form C 6-20 -aliphatic or aromatic ring, unsubstituted or substituted C 1-10 -hydrocarbyl group; Q1 and Q2 are the same or different from each other and each independently represents a hydrogen atom, a halogen atom, C 1-20 -alkyl, C2-20 -alkenyl, C 2-20 -alkoxyalkyl, C 6-20 -aryl, C 7-40 -alkylaryl or C 7-40 -arylalkyl; A1 represents a carbon atom (C), a silicon atom (Si), or a germanium atom (Ge); M1 is a transition metal of group 4; X1 and X2 are the same or different and each independently represents a halogen atom, C 1-20 -alkyl, C 2-20 -alkenyl, C 6-20 -aryl, nitro group, amido group, C 1-20 -alkyl-silyl, C 1-20 -alkoxy group or C 1-20 -sulfonate group; and m has the value 0 or 1; [Chemical formula 2] , in chemical formula 2 Q3 and Q4 are the same or different from each other and each independently represents a hydrogen atom, a halogen atom, C 1-20 -alkyl, C 2-20 -alkenyl, C 2-20 -alkoxyalkyl, C 6-20 -aryl, C 7-40 -alkylaryl or C7-40 -arylalkyl; A2 is a carbon atom (C), a silicon atom (Si), or a germanium atom (Ge); M2 is a transition metal of group 4; X3 and X4 are the same or different and each independently represents a halogen atom, C 1-20 -alkyl, C 2-20 -alkenyl, C 6-20 -aryl, nitro group, amido group, C 1-20 -alkyl-silyl, C 1-20 -alkoxy group or C 1-20 -sulfonate group; and any one of the fragments C1 and C2 is represented by the following chemical formula 2a or 2b, and the other one of the fragments C1 and C2 is represented by the following chemical formula 2c, 2d or 2e; [Chemical formula 2a] [Chemical formula 2b] [Chemical formula 2c] [Chemical formula 2d] [Chemical formula 2e] , in chemical formulas 2a, 2b, 2c, 2d and 2e the substituents R9-R 39 and R9'-R 21 ' are the same or different from each other and each independently represents a hydrogen atom, a halogen atom, C 1-20 -alkyl, C 1-20 -haloalkyl, C 2-20 -alkenyl, C 1-20 -alkyl-silyl, C 1-20 -alkylsilylalkylene, C 1-20 -alkoxysilyl, C 1-20 -alkoxy group, C 6-20 -aryl, C 7-40 -alkylaryl or C 7-40 -arylalkyl, provided that at least one of the substituents R 17 -R 21 and R 17 '-R 21 ' represents C 1-20 -haloalkyl; two or more substituents R 22 -R 39 , located adjacent to each other, can be connected to each other to form C 6-20-aliphatic or aromatic ring, unsubstituted or substituted C 1-10 -hydrocarbyl group; and * denotes the binding site with A2 and M2; [Chemical formula 3] , in chemical formula 3 Q5 and Q6 are the same or different from each other and each independently represents a hydrogen atom, a halogen atom, C 1-20 -alkyl, C 2-20 -alkenyl, C 2-20 -alkoxyalkyl, C 6-20 -aryl, C 7-40 -alkylaryl or C 7-40 -arylalkyl; A3 represents a carbon atom (C), a silicon atom (Si), or a germanium atom (Ge); M3 is a transition metal of group 4; X5 and X6 are the same or different and each independently represents a halogen atom, C 1-20 -alkyl, C 2-20 -alkenyl, C 6-20 -aryl, nitro group, amido group, C 1-20 -alkyl-silyl, C 1-20 -alkoxy group or a C 1-20-sulfonate group; and any of the C3 and C4 fragments is represented by the chemical formulas 3a, 3b or 3c, provided that at least one of the C3 and C4 fragments is not represented by the chemical formula 3c, [Chemical formula 3a] [Chemical formula 3b] [Chemical formula 3c] , in chemical formulas 3a and 3b, R 40 -R 47 and R 40 '-R 47 ' are the same or different from each other and each independently represents a hydrogen atom, a halogen atom, C 1-20 -alkyl, C 1-20 -haloalkyl, C 2-20 -alkenyl, C 1-20 -alkylsilyl, C 1-20 -alkylsilyl-alkylene, C 1-20 -alkoxysilyl, C 1-20 -alkoxy group, C 6-20 -aryl, C 7-40 -alkylaryl or C 7-40 -arylalkyl; and R 48 and R 48’ are the same or different from each other and each independently represents C 1-20 -alkyl, C 1-20 -alkyl-silyl, C 1-20 -alkylsilylalkylene, C 1-20 -alkoxysilyl or C 1-20 -alkoxy group; in the chemical formula 3c R 49 -R 56 are the same or different from each other and each independently represents a hydrogen atom, a halogen atom, C 1-20 -alkyl, C 1-20 -haloalkyl, C 2-20 -alkenyl, C 1-20 -alkylsilyl, C 1-20 -alkylsilylalkylene, C 1-20 -alkoxysilyl, C 1-20 -alkoxy group, C 6-20 -aryl, C 7-40 -alkylaryl or C 7-40 -arylalkyl, or two or more substituents R 49 -R 56 , located adjacent to each other, may be joined to each other to form a substituted or unsubstituted aliphatic ring or a substituted or unsubstituted aromatic ring; and * denotes the binding site with A3 and M3.

13. The method for producing polyethylene according to claim 12, wherein the first metallocene compound is represented by any of the following chemical formulas from 1-1 to 1-4: [Chemical formula 1-1] [Chemical formula 1-2] [Chemical formula 1-3] [Chemical formula 1-4] , in chemical formulas from 1-1 to 1-4 Q1, Q2, A1, M1, X1, X2 and R1-R8 have the meanings defined in paragraph 12, and R' and R” are the same or different and each independently represents a hydrogen atom or C 1-10 -hydrocarbyl group.

14. The method for producing polyethylene according to claim 12, wherein each of the substituents R3 and R6 is C 1-6 -alkyl or C 2-6 -alkyl substituted with C1-6 -alkoxy group.

15. The method for producing polyethylene according to claim 12, wherein the second metallocene compound is represented by the following chemical formula 2-1: [Chemical formula 2-1] , in the chemical formula 2-1 Q3, Q4, A2, M2, X3, X4, R 11 , R 17 -R 21 and R 22 -R 29 have the meanings defined above in paragraph 12.

16. The method for producing polyethylene according to claim 12, in which each of the substituents R 17 -R 21 and R 17 '-R 21 ' represents a hydrogen atom or C 1-6 -haloalkyl, provided that at least one of the substituents R 17 -R 21 and R 17 '-R 21 ' represents C 1-6 -haloalkyl.

17. The method for producing polyethylene according to claim 12, wherein the third metallocene compound is represented by the following chemical formula 3-1: [Chemical formula 3-1] , in the chemical formula 3-1 Q5, Q6, A3, M3, X5, X6, R 45 , R 48 and R 49 -R 56 have the meanings defined in paragraph 12.

18. The method for producing polyethylene according to claim 12, in which each of the substituents R 45 and R 45 ' represents a hydrogen atom, a halogen atom, C 1-6 -alkyl or C 1-6 -alkoxy group.

19. The method for producing polyethylene according to claim 12, in which each of the substituents R 48 and R 48 ' represents C 1-6 -alkyl, C 1-6 -alkylsilyl, C 1-6 -alkylsilylalkylene or C 6-12 -aryl.

20. The method for producing polyethylene according to claim 12, wherein the molar ratio of the first metallocene compound to the second metallocene compound is from 1:1 to 1:3, and the molar ratio of the first metallocene compound to the third metallocene compound is from 1:2 to 1:

8.

21. The method for producing polyethylene according to claim 12, in which the polymerization stage is carried out with the introduction of hydrogen gas in an amount of 70 to 120 ppm based on the ethylene content.

22. A polyethylene composition comprising polyethylene according to any one of paragraphs 1-11 and recycled polyethylene resin (RPR).

23. The polyethylene composition according to claim 22, in which recycled polyethylene resin (PPS) is included in an amount of 10 to 90% by weight.

24. The polyethylene composition according to claim 22, wherein the recycled polyethylene resin (PPS) has a density of 0.940 to 0.960 g / cm 3 .

25. The polyethylene composition of claim 22, wherein the polyethylene composition has a notched constant tensile load (NCLS) strength, measured according to ASTM F 2136, of 7 hours or greater.