Isoprene polymerization catalyst composition, method for producing synthetic polyisoprene, and synthetic polyisoprene
AssigneeBridgestone Corporation
InventorsShojiro KAITA, Satoru TAMAKI
Life of this patent
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Abstract
An isoprene polymerization catalyst composition includes: Component (a): a rare earth element compound having a rare earth element-oxygen bond or a rare earth element-sulfur bond; Component (b): an ionic compound; and Component (c): at least one compound selected from the group consisting of a compound of formula (X): YR1aR2bR3c and a compound having a repeating unit of formula (Y): (—Y(R1)O—) (where Y is a metal selected from groups 1, 2, 12 and 13 in a periodic table, R1 and R2 are C1-10 hydrocarbon groups or hydrogen atoms and R3 is a C1-10 hydrocarbon group).
Claims7
An isoprene polymerization catalyst composition comprising:
- a component (a):
- a rare earth element compound having a rare earth element-oxygen bond or a rare earth element-sulfur bond;
- a component (b):
- an ionic compound;
- and
- a component (c):
- at least one compound selected from the group consisting of a compound represented by the following general formula (X) and a compound having a repeating unit represented by the following general formula (Y):
- YR1aR2bR3c (X)
- (—Y(R1)O—) (Y)
- where Y is a metal selected from groups 1, 2, 12 and 13 in a periodic table, R1 and R2 are hydrocarbon groups with a carbon number of 1 to 10 or hydrogen atoms and R3 is a hydrocarbon group with a carbon number of 1 to 10 where R1, R2 and R3 are the same or different, and a=1, b=0, and c=0 in the case where Y is the metal selected from the group 1 in the periodic table, a=1, b=1, and c=0 in the case where Y is the metal selected from the groups 2 and 12 in the periodic table, and a=1, b=1, and c=1 in the case where Y is the metal selected from the group 13 in the periodic table.
A method for producing a synthetic polyisoprene, which comprises polymerizing an isoprene monomer in the presence of an isoprene polymerization catalyst composition comprising:
- a component (a):
- a rare earth element compound having a rare earth element-oxygen bond or a rare earth element-sulfur bond;
- a component (b):
- an ionic compound;
- and
- a component (c):
- at least one compound selected from the group consisting of a compound represented by the following general formula (X) and a compound having a repeating unit represented by the following general formula (Y):
- YR1aR2bR3c (X)
- (—Y(R1)O—) (Y)
- where Y is a metal selected from groups 1, 2, 12 and 13 in a periodic table, R1 and R2 are hydrocarbon groups with a carbon number of 1 to 10 or hydrogen atoms and R3 is a hydrocarbon group with a carbon number of 1 to 10 where R1, R2 and R3 are the same or different, and a=1, b=0, and c=0 in the case where Y is the metal selected from the group 1 in the periodic table, a=1, b=1, and c=0 in the case where Y is the metal selected from the groups 2 and 12 in the periodic table, and a=1, b=1, and c=1 in the case where Y is the metal selected from the group 13 in the periodic table.
Dependencies are inferred from the claim text.