Catalyst for olefin polymerization, method for producing olefin polymer, method for producing propylene-based copolymer, propylene polymer, propylene-based polymer composition, and use of those

1. A method for producing a syndiotactic α-olefin polymer, comprising polymerizing one or more monomers selected from α-olefins having 2 or more carbon atoms, in the presence of a catalyst (1) for olefin polymerization which comprises:

(a-1) a bridged metallocene compound represented by the following Formula [1-1], and

(b) at least one compound selected from:

(b-1) an organoaluminum oxy compound,

(b-2) a compound which reacts with the bridged metallocene compound (a-1) to form an ion pair, and

(b-3) an organoaluminum compound;

wherein in Formula [1-1], R 1 , R 2 , R 3 and R 4 are each a hydrogen atom;

R 5 , R 8 , R 9 and R 12 are each a hydrogen atom;

R 7 and R 10 are each a tert-butyl group, and R 6 and R 11 are each an aryl group or a substituted aryl group;

R 6 and R 7 are not linked to each other to form a ring and R 10 and R 11 are not linked to each other to form a ring;

R 13 and R 14 , which may be identical to or different from each other, are each a hydrocarbon group having 2 to 20 carbon atoms, provided that R 13 and R 14 are not linked to each other to form a ring;

M is Ti, Zr or Hf;

Y is carbon;

Q, which may be identical to or different from each other, is selected from a halogen, a hydrocarbon group, an anion ligand and a neutral ligand capable of coordination with a lone electron pair; and

j is an integer from 1 to 4.

2. The method for producing the syndiotactic α-olefin polymer according to claim 1 , wherein the catalyst (1) for olefin polymerization further comprises a support (c).

3. The method for producing a syndiotactic α-olefin polymer according to claim 1 , wherein R 6 and R 11 are identical groups.

4. The method for producing a syndiotactic α-olefin polymer according to claim 1 , wherein R 13 and R 14 are each any one selected from an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a tert-butyl group, cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a phenyl group, an m-tolyl group, a p-tolyl group, a benzyl group, an m-(trifluoromethyl)phenyl group, a p-(trifluoromethyl)phenyl group, a bis(trifluoromethyl)phenyl group, an m-chlorophenyl group, a p-chlorophenyl group and a dichlorophenyl group.

5. The method for producing a syndiotactic α-olefin polymer according to claim 1 , wherein the bridged metallocene compound (a-1) has a Cs-symmetric structure.

6. A method for producing a propylene-based copolymer (B1), comprising polymerizing propylene and at least one monomer selected from α-olefins excluding propylene and polyenes, in the presence of a catalyst (2) for olefin polymerization which comprises:

(a-2) a bridged metallocene compound represented by the following Formula [1-2],

(b) at least one compound selected from:

(b-1) an organoaluminum oxy compound,

(b-2) a compound which reacts with the bridged metallocene compound (a-2) to form an ion pair, and

(b-3) an organoaluminum compound;

wherein in Formula [1-2], R 1 , R 2 , R 3 , and R 4 , are each a hydrogen atom;

R 5 , R 8 , R 9 and R 12 are each a hydrogen atom;

R 6 and R 11 are the same atoms or same groups selected from a hydrogen atom, a hydrocarbon group and a silicon-containing group;

R 7 and R 10 are each a tert-butyl group;

R 13 and R 14 , which may be identical to or different from each other, are each selected from a chloroaryl group having 6 to 20 carbon atoms, and a fluoroalkylaryl group having 7 to 40 carbon atoms;

M is Ti, Zr or Hf;

Y is carbon or silicon;

Q is selected from a halogen, a hydrocarbon group, a neutral, conjugated or non-conjugated diene having 10 or fewer carbon atoms, an anion ligand, and a neutral ligand capable of coordination with a lone electron pair, in identical or different combinations;

j is an integer from 1 to 4; and

wherein the propylene content in the propylene-based copolymer (B1) is in the range of 90 to 55 mol %.

7. The method for producing a propylene-based copolymer (B1) according to claim 6 , wherein in the Formula [1-2], R 6 and R 11 are the same groups selected from a hydrocarbon group and a silicon-containing group.

8. The method for producing a propylene-based copolymer (B1) according to claim 7 , wherein R 6 and R 11 are each a phenyl group.

9. The method for producing a propylene-based copolymer (B1) according to claim 6 , wherein the chloroaryl group having 6 to 20 carbon atoms, and the fluoroalkylaryl group having 7 to 40 carbon atoms are each a substituted phenyl group having its substituent located at the meta-position and/or para-position.

10. The method for producing a propylene-based copolymer (B1) according to claim 9 , wherein R 13 and R 14 are each the chloroaryl group having 6 to 20 carbon atoms.

11. The method for producing a propylene-based copolymer (B1) according to claim 9 , wherein R 13 and R 14 are each selected from the group consisting of an m-chlorophenyl group, a p-chlorophenyl group, an m-trifluorophenyl group, a p-trifluorophenyl group, a 3,5-ditrifluorophenyl group, a 5-chloronaphthyl group, and a 6-chloronaphthyl group.

12. The method for producing a propylene-based copolymer (B1) according to claim 11 , wherein R 13 and R 14 are each are a p-chlorophenyl group.

13. The method for producing a propylene-based copolymer (B1) according to claim 6 , wherein the polymerizing is performed at the temperature within the range from 40 to 200° C.