Technical Field
[0001]
The present invention relates to a solid titanium
10 catalyst component, a catalyst for olefin polymerization
containing the solid titanium catalyst component, an olefin
polymerization method involving the catalyst for olefin
polymerization, and a propylene polymer.
15 Background Art
[0002]
To date, known catalysts that are used to produce an
olefin polymer such as an α-olefin homopolymer or an
ethylene/α-olefin copolymer include catalysts containing a
20 titanium compound supported on an activated magnesium halide.
Hereinafter, "homopolymerization" and "copolymerization" may
be collectively referred to as "polymerization".
[0003]
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For example, catalysts containing titanium tetrachloride
or titanium trichloride called Ziegler-Natta catalysts, and
catalysts containing an organometallic compound and a solid
titanium catalyst component composed of magnesium, titanium,
5 halogen, and an electron donor are widely known as such
catalysts for olefin polymerization.
[0004]
The latter catalysts show high activity in the
polymerization of α-olefins such as ethylene, propylene, and
10 1-butene. The resulting α-olefin polymers may have high
stereoregularity.

CLAIMS
[Claim 1]
A solid titanium catalyst component (I) comprising
5 titanium, magnesium, halogen, and a cyclic multiple-estergroup-containing compound (a) represented by the following
formula (1):
[Chem. 1]
10 wherein n1 to n4 are each independently an integer of 0
to 2, m is 0 or 1, and x is an integer of 0 to 10, with a
relationship of m+x≥1 being satisfied;
R1 and R2 are each independently a substituted or
unsubstituted hydrocarbon group having 1 to 20 carbon atoms;
15 R3 to R16 and R are each independently a hydrogen atom, a
substituted or unsubstituted hydrocarbon group having 1 to 20
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carbon atoms, or a halogen atom; a hydrogen atom, a carbon
atom, or both, of R1 to R16 and R are optionally replaced by
at least one atom selected from the group consisting of a
nitrogen atom, an oxygen atom, a phosphorus atom, a halogen
5 atom, and a silicon atom; and two or more selected from R3 to
R16 and R are optionally bonded to one another to form a
monocyclic or polycyclic ring, and adjacent substituents are
optionally directly bonded to form a multiple bond;
Ca, Cb, and Cc are carbon atoms, and in a carbon-carbon
10 bond of a cyclic structure formed of Ca, Cb, and Cc, R bonded
to adjacent carbon are optionally directly bonded to one
another to form a multiple bond; and
A is a single bond or a divalent linking group having a
chain with a length of 1 to 3 atoms between two free radicals.
15 [Claim 2]
The solid titanium catalyst component (I) according to
claim 1, wherein in the formula (1), a moiety in which two or
more selected from R3 to R16 and R are bonded to one another
to form a monocyclic or polycyclic ring is a structure
20 containing a carbon-carbon double bond.