Process for producing α-olefin polymer
View Patent ↗An α-olefin polymer having extremely high stereoregularity, exhibiting excellent fluidity and containing a decreased amount of catalyst residues in the polymer can be obtained industrially advantageously in accordance with a process for producing an α-olefin polymer which comprises homopolymerizing an α-olefin or copolymerizing two or more α-olefins in the presence of (A) a solid catalyst component comprising magnesium, titanium and a halogen, (B) an organoaluminum compound having a content of hydroaluminum compounds of 0.1% by weight or smaller and (C) an organozinc compound. A block copolymer of propylene comprising a homopolymer portion exhibiting high fluidity and a copolymer portion having a high molecular weight can be obtained in accordance with a process for producing a block copolymer of propylene which comprises polymerizing propylene in the presence of (A) a solid catalyst component comprising a titanium compound and an electron-donating agent, (B) an organoaluminum compound and (C) an organozinc compound to produce crystalline polypropylene and copolymerizing propylene and at least one of ethylene and α-olefins having 4 or more carbon atoms in the presence of the produced crystalline polypropylene.
1. A process for producing an α-olefin polymer which comprises
homopolymerizing an α-olefin or
copolymerizing two or more α-olefins in the presence of
(A) a solid catalyst component comprising
a magnesium compound,
a titanium compound,
a halogen and
a silicon compound represented by general formula (IV),
Si(OR 16 ) q X 2 4-q (IV)
(B) an organoaluminum compound having a content of hydroaluminum compound of 0.1% by weight or less and
(C) an organozinc compound,
wherein R 16 represents a hydrocarbon group,
X 2 represents a halogen and
q represents an integer of 0 to 3.
2. The process according to claim 1 , wherein the solid catalyst component (A) further comprises an electron-donating agent.
3. The process according to claim 1 , wherein the organozinc compound (C) is an organozinc compound represented by the formula:
ZnR 1 R 2
wherein R 1 and R 2 each independently represent a hydrocarbon group having 1 to 10 carbon atoms.
4. The process according to claim 1 , wherein said homopolymerizing or said copolymerizing is conducted in the presence of (D) an electron-donating compound.
5. The process according to claim 1 , wherein the organoaluminum compound (B) has a content of hydroaluminum compound of 0.01% by weight or less.
6. A process for producing a block copolymer of propylene which comprises
polymerizing a first propylene in the presence of
(A) a solid catalyst component comprising
a titanium compound,
an electron-donating agent, and
a silicon compound represented by general formula (IV),
Si(OR 16 ) q X 2 4-q (IV)
(B) an organoaluminum compound and
(C) an organozinc compound to produce a crystalline polypropylene and then
copolymerizing a second propylene and at least one additional monomer selected from the group consisting of ethylene and α-olefins, having 4 or more carbon atoms, in the presence of the crystalline polypropylene
wherein R 16 represents a hydrocarbon group,
X 2 represents a halogen and
q represents an integer of 0 to 3.
7. The process according to claim 6 , wherein the solid catalyst component (A) further comprises a magnesium compound.
8. The process according to claim 6 , wherein said polymerizing a first propylene is conducted in the presence of (D) an electron-donating compound.
9. The process according to claim 8 , wherein the electron-donating compound is an organosilicon compound.
10. The process according to claim 8 , wherein the solid catalyst component (A) is produced by the process comprising:
contacting the titanium compound and a magnesium compound in the presence of the electron-donating agent at a temperature of 120 to 150° C. and
washing an obtained product with an inert solvent at a temperature of 100 to 150° C.
11. The process according to claim 10 , wherein the solid catalyst component (A) is produced by the process comprising:
contacting the titanium compound and the magnesium compound in the presence of the electron-donating agent and a silicon compound at a temperature of 120 to 150° C. and
washing an obtained product with an inert solvent at a temperature of 100 to 150° C.
12. The process according to claim 6 , wherein the organozinc compound (C) is an organozinc compound represented by the formula:
ZnR 1 R 2
wherein R 1 and R 2 each independently represent a hydrocarbon group having 1 to 10 carbon atoms.
13. The process according to claim 6 , wherein (E) an electron-donating substance is added before or during said copolymerizing a second propylene and at least one additional monomer.
14. A process for producing an α-olefin polymer according to claim 1 , wherein the solid catalyst comprises a titanium compound represented by formula (II)
TiX 1 n (OR 7 ) 4-p (II)
wherein X 1 represents a halogen atom,
R 7 represents a hydrocarbon group which may be a saturated group or an unsaturated group, may be a linear group, a branched group or cyclic group and may have hetero atoms,
p represents an integer of 0 to 4.
15. A process for producing a block copolymer of propylene according to claim 6 , wherein the solid catalyst comprises a titanium compound represented by formula (II)
TiX 1 n (OR 7 ) 4-p (II)
wherein X 1 represents a halogen atom,
R 7 represents a hydrocarbon group which may be a saturated group or an unsaturated group, may be a linear group, a branched group or cyclic group and may have hetero atoms,
p represents an integer of 0 to 4.
16. A process for producing an α-olefin polymer according to claim 3 , wherein the solid catalyst comprises a titanium compound represented by formula (II)
TiX 1 n (OR 7 ) 4-p (II)
wherein X 1 represents a halogen atom,
R 7 represents a hydrocarbon group which may be a saturated group or an unsaturated group, may be a linear group, a branched group or cyclic group and may have hetero atoms,
p represents an integer of 0 to 4.
17. A process for producing a block copolymer of propylene according to claim 12 , wherein the solid catalyst comprises a titanium compound represented by formula (II)
TiX 1 n (OR 7 ) 4-p (II)
wherein X 1 represents a halogen atom,
R 7 represents a hydrocarbon group which maybe a saturated group or an unsaturated group, may be a linear group, a branched group or cyclic group and may have hetero atoms, p represents an integer of 0 to 4.