ETHYLENE -a-OLEFIN COPOLYMER AND MOLDED OBJECT THEREOF
AssigneeSumitomo Chemical Company, Limited
InventorsYoshinobu Nozue, Yasutoyo Kawashima, Naoko Ochi, Takuya Ogane
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Abstract
The purpose of the invention is to provide an ethylene-α-olefin copolymer, which has a high melt tension but a small neck-in, and a molded object produced by extrusion molding of the copolymer. An ethylene-α-olefin copolymer having a monomer unit based on ethylene and a monomer unit based on an α-olefin having 3 to 20 carbon atoms, which has a melt flow rate (MFR) of 0.1 to 100 g/10 min, a density (d) of 850 to 940 kg/m3, a ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn) of 2 to 12, and a value g* defined by the following formula (I) of 0.50 to 0.75: g*=[η]/([η]GPC×gSCB*) (I).
Claims7
An ethylene-α-olefin copolymer having a monomer unit based on ethylene and a monomer unit based on an α-olefin having 3 to 20 carbon atoms, which has a melt flow rate (MFR) of 0.1 to 100 g/10 min, a density (d) of 850 to 940 kg/m3, a ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn) of 2 to 12, and a value g* defined by the following formula (I) of 0.50 to 0.75:
- g*=[η]/([η]GPC×gSCB*) (I),
- wherein [η] stands for intrinsic viscosity (unit:
- dl/g) of the ethylene-α-olefin copolymer and is defined by the following formula (I-I):
- [α]=23.3×log(ηrel) (I-I),
- wherein ηrel stands for relative viscosity of the ethylene-α-olefin copolymer,
- [η]GPC is defined by the following formula (I-II):
- [η]GPC=0.00046×Mv0.725 (I-II),
- wherein Mv stands for viscosity average molecular weight of the ethylene-α-olefin copolymer, and
- gSCB* is defined by the following formula (I-III):
- gSCB*=(1−A)1.725 (I-III),
- wherein A can be obtained directly by measuring short chain branch content in the ethylene-α-olefin copolymer.
An olefin polymerization catalyst formed by contacting the following component (A), the following component (B), and the following component (C):
- Component (A):
- a transition metal compound represented by the following general formula (1)
- in the formula, R1 and R3 each independently stand for an aryl group having 6 to 20 carbon atoms, which may be substituted, R2 and R4 each independently stand for a hydrogen atom or a hydrocarbyl group having 1 to 20 carbon atoms, which may be substituted, a and b each independently stand for an integer of 0 to 4, and at least one of a and b stands for an integer of 1 or more, when R1 to R4 are respectively plural, plural R1s to R4s respectively may be same as or different from each other, X1 stands for a hydrogen atom, a halogen atom, a hydrocarbyl group having 1 to 20 carbon atoms, which may be substituted, a hydrocarbyloxy group having 1 to 20 carbon atoms, which may be substituted, a substituted silyl group having 1 to 20 carbon atoms, or a substituted amino group having 1 to 20 carbon atoms, and two X1 may be same as or different from each other, m stands for an integer of 1 to 5, J stands for carbon atom or silicon atom, and when plural J are present, the plural J may be same as or different from each other, and R5 stands for a hydrogen atom or a hydrocarbyl group having 1 to 20 carbon atoms, which may be substituted, and plural R5s may be same as or different from each other;
- Component (B):
- a solid catalyst component formed by contacting the following component (a), the following component (b), the following component (c), and the following component (d):
- Component (a):
- a compound represented by the following general formula (2)
- ZnL2 (2),
- Component (b):
- a compound represented by the following general formula (3)
- Component (c):
- H2O, and
- Component (d):
- SiO2,
- wherein in the formulas, L stands for a hydrocarbyl group having 1 to 20 carbon atoms, which may be substituted, and two L may be same as or different from each other, R6 stands for an electron-withdrawing group or a group containing an electron-withdrawing group, c stands for an integer of 1 to 5, and when plural R6s are present, the plural R6s may be same as or different from each other;
- and
- Component (C):
- an organic aluminium compound.
Dependencies are inferred from the claim text.