# US 5,710,223 A · Process for polymerizing propylene by using a novel metallocene catalyst

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- Number: US 5,710,223 A
- Document ID: US5710223A
- Status: Granted
- Kind: A
- Application number: 08/719,540
- Filed: 1996-09-25
- Granted: 1998-01-20
- Earliest claimed: 1993-06-07
- Assignees: Mitsui Petrochemical Industries, Ltd.
- Inventors: Daisuke Fukuoka; Takashi Tashiro; Koji Kawaai; Junji Saito; Takashi Ueda; Yoshihisa Kiso; Junichi Imuta; Terunori Fujita; Masatoshi Nitabaru; Masayasu Yoshida
- Web page: https://patentgrep.com/patent/US5710223A

## CPC

- C08F 210/16: Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- C07C 45/46: Friedel-Crafts reactions
- C07C 49/67: having two rings, e.g. tetralones
- C07C 49/697: containing six-membered aromatic rings
- C07F 17/00: Metallocenes
- C08F 10/00: Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F 10/06: Propene
- C08F 110/06: Propene
- C08F 4/61912: {in combination with an organoaluminium compound}
- C08F 4/61927: {two cyclopentadienyl rings being mutually bridged}
- C08F 4/65908: {in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+}
- C08F 4/65912: {in combination with an organoaluminium compound}
- C08F 4/65916: {supported on a carrier, e.g. silica, MgCl2, polymer}
- C08F 4/65927: {two cyclopentadienyl rings being mutually bridged}
- C08F 210/06: Propene
- Y10S 526/904: Monomer polymerized in presence of transition metal containing catalyst at least part of which is supported on a polymer, e.g. prepolymerized catalysts
- Y10S 526/943: Polymerization with metallocene catalysts
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A process for polymerizing propylene utilizes a metallocene catalyst component of the formula (I) ##STR1## wherein M is a transition metal, R.sup.1 is a C.sub.2-6 hydrocarbon, R.sup.2 is a C.sub.6-16 aryl group, X.sup.1 and X.sup.2 are each a halogen atom and Y is a divalent hydrocarbon or a divalent silicon-containing group. Propylene polymers produced thereby have such properties that the triad tacticity of propylene units is high, the proportion of inversely inserted units based on the 2,1-insertion of propylene monomer is in a specific range and the intrinsic viscosity (.eta.), as measured in decahydronaphthalene at 135.degree. C., is in a specific range.

## Claims

### Claim 1

A process for propylene polymerization comprising polymerizing propylene or copolymerizing propylene and at least one kind of .alpha.-olefin selected from the group consisting of ethylene and .alpha.-olefins of 4 to 10 carbon atoms to obtain propylene homopolymer or propylene copolymer containing propylene units in an amount of not less than 50% by mol in the presence of a propylene polymerization catalyst selected from the group consisting of
(I) a propylene polymerization catalyst produced by contacting, in any order,
(A) a propylene polymerization catalyst component comprising a transition metal compound represented by the following formula (I): ##STR21## M is a transition metal selected from the group consisting of zirconium and hafnium;
R.sup.1 is a hydrocarbon group of 2 to 6 carbon atoms;
R.sup.2 is an aryl group selected from the group consisting of anthracenyl and phenanthryl, which may be substituted with a hydrocarbon group of 1 to 20 carbon atoms;
X.sup.1 and X.sup.2 are each a hydrogen atom, a halogen atom, a hydrocarbon group of 1 to 20 carbon atoms, a halogenated hydrocarbon group of 1 to 20 carbon atoms, an oxygen-containing group or a sulfur-containing group; and
Y is a divalent silicon-containing group selected from the group consisting of dialkylsilylene, alkylarylsilylene and diarylsilylene; with
(B) at least one compound selected from the group consisting of
(B-1) an aluminoxane, and
(B-2) a compound which reacts with said transition metal compound to form an ion pair;
(II) a propylene polymerization catalyst produced by contacting, in any order,
said propylene polymerization catalyst component as defined in (A) above,
said at least one compound as defined in (B) above, and (C) an organoaluminum compound;
(III) a propylene polymerization catalyst produced by contacting, in any order,
a fine particle carrier,
said propylene polymerization catalyst component as defined in (A) above, and
said at least one compound as defined in (B) above,
wherein said propylene polymerization catalyst as defined in (A) above and said at least one compound as defined in (B) above are supported on said fine particle carrier;
(IV) a propylene polymerization catalyst produced by contacting
said propylene polymerization catalyst as defined in (III) above, with
an organoaluminum compound as defined in (C) above;
(V) a propylene polymerization catalyst produced by prepolymerizing propylene with said propylene polymerization catalyst as defined in (IV) above; and
(VI) a propylene polymerization catalyst produced by contacting
said propylene polymerization catalyst as defined in (V) above, with
an organoaluminum compound as defined in (C) above.

### Claim 2 (depends on 1)

The process for olefin polymerization a claimed in claim 1, wherein in formula (I)
X.sup.1 and X.sup.2 are each a halogen atom; and
Y is a di-C.sub.1 -C.sub.3 -alkyl silyl group.

### Claim 3 (depends on 1)

The process for olefin polymerization as claimed in claim 1, wherein M is zirconium, X.sup.1 and X.sup.2 are each methyl and Y is a dimethylsilyl group.

### Claim 4 (depends on 3)

The process for olefin polymerization as claimed in claim 3, wherein R.sup.1 is ethyl.