Bridged metallocene compound, olefin polymerization catalyst containing the same, and ethylene polymer obtained with the catalyst

A process for producing olefin polymers, comprising polymerizing one or more monomers selected from ethylene and C3-20 olefins and at least one of the monomers is ethylene or propylene, in the presence of an olefin polymerization catalyst (b) comprising the following components (A), (B) and (C):

• Component (A):
• a bridged metallocene compound of Formula (1) described below;
• wherein R1, R2, R3 and R4 are selected from a hydrogen atom, hydrocarbon groups, and halogen-containing hydrocarbon groups and are the same or different from one another;
• and at least one of these groups is an ethyl group or a group represented by Formula [6] below;
• neighboring substituent groups among R1 to R4 may be linked together to form an aliphatic ring;
• Q1 is selected from C1-20 hydrocarbon groups, halogen-containing groups, silicon-containing groups, germanium-containing groups and tin-containing groups;
• X independently at each occurrence is a group selected from a hydrogen atom, halogen atoms, hydrocarbon groups, halogen-containing groups, silicon-containing groups, oxygen-containing groups, sulfur-containing groups, nitrogen-containing groups and phosphorus-containing groups;
• and M is a titanium atom, a zirconium atom or a hafnium atom;
• wherein R7 to R16 are selected from a hydrogen atom, hydrocarbon groups, and halogen-containing hydrocarbon groups and are the same or different from one another, but they are not aryl groups;
• and T represents a carbon atom;
• Component (B):
• a bridged metallocene compound represented by Formula [14] below;
• wherein R17 to R20, and R21 to R28 are selected from a hydrogen atom, hydrocarbon groups, halogen-containing groups, oxygen-containing groups, nitrogen-containing groups, boron-containing groups, sulfur-containing groups, phosphorus-containing groups, silicon-containing groups, germanium-containing groups and tin-containing groups and are the same or different from one another;
• neighboring substituent groups among these groups may be linked together to form a ring;
• Q2 is selected from C1-20 hydrocarbon groups, halogen-containing groups, silicon-containing groups, germanium-containing groups and tin-containing groups;
• M is selected from a titanium atom, a zirconium atom and a hafnium atom;
• and X independently at each occurrence is a group selected from a hydrogen atom, halogen atoms, hydrocarbon groups, halogen-containing groups, silicon-containing groups, oxygen-containing groups, sulfur-containing groups, nitrogen-containing groups and phosphorus-containing groups;
• Component (C):
• at least one compound selected from the group consisting of:
• (c-1) organometallic compounds represented by Formulae [18], [19] and [20] below;
• (c-2) organoaluminum oxy-compounds;
• and
• (c-4) compounds that react with components (A) and (B) to form an ion pair;
• RmaAl(ORb)nHpXq [18]
• wherein Ra and Rb are each a C1-15 hydrocarbon group and are the same or different from each other;
• X is a halogen atom;
• 0≦m≦3, 0≦n<3, 0≦p<3, 0≦q<3 and m+n+p+q=3;
• MaAlR4a [19]
• wherein Ma is Li, Na or K;
• and Ra is a C1-15 hydrocarbon group;
• RraMbRsbXt [20]
• wherein Ra and Rb are each a C1-15 hydrocarbon group and are the same or different from each other;
• Mb is selected from Mg, Zn and Cd;
• X is a halogen atom;
• 0<r≦2, 0≦s<1, 0≦t≦1 and r+s+t=2,
• wherein the olefin polymers satisfy the following requirements [3] and [6]
• [3] the ratio [MT/η*(g/P)] is in the range of 2.50×10−4 to 9.00×10−4 wherein [MT (g)] is the melt tension at 190° C. and [η*(P)] is the shear viscosity at 200° C. and an angular velocity of 1.0 rad/sec;
• [6] a molecular weight distribution curve obtained by GPC shows a molecular weight at a maximum weight fraction (peak top M) in the range of 1.0×104.30 to 1.0×104.50.