Title:
POLYISOPRENE PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2020/208902
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a polyisoprene production method that makes it possible to efficiently obtain polyisoprene having a large number of vinyl bonds and a low degree of branching. The means for solving said problem is a polyisoprene production method characterized by including a step for polymerizing isoprene in the presence of a polymerization catalyst composition which contains a half-metallocene cation complex represented by general formula (I) (in the formula: M indicates a lanthanide element, scandium, or yttrium; CpR' indicates a substituted cyclopentadienyl, a substituted indenyl, or a substituted fluorenyl, each having at least one substituent containing Si; X indicates a hydrogen atom, a halogen atom, an alkoxy group, a thiolate group, an amide group, a silyl group, or a C1–20 monovalent hydrocarbon group; L indicates a neutral Lewis base; w indicates an integer from 0 to 3; and [B]- indicates a non-coordinating anion).
Inventors:
TAKANO SHIGENAGA (JP)
KAITA SHOJIRO (JP)
KAITA SHOJIRO (JP)
Application Number:
PCT/JP2020/003030
Publication Date:
October 15, 2020
Filing Date:
January 28, 2020
Export Citation:
Assignee:
BRIDGESTONE CORP (JP)
International Classes:
C08F4/6192; C08F136/08
Domestic Patent References:
| WO2007129670A1 | 2007-11-15 | |||
| WO2019111495A1 | 2019-06-13 |
Foreign References:
| JP2008266523A | 2008-11-06 |
Other References:
DU, G. X. ET AL.: "Copolymerization of isoprene with ethylene catalyzed by cationic half-sandwich fluorenyl scandium catalysts", JOURNAL OF POLYMER SCIENCE , PART A: POLYMER CHEMISTRY, vol. 53, 2015, pages 2898 - 2907, XP055747406
ZHANG, L. X. ET AL.: "Unprecedented isospecific 3,4-polymerization of isoprene by cationic rare earth metal alkyl species resulting from a binuclear precursor", JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 127, 2005, pages 14562 - 14563, XP055747400
CHEN, J. Z. ET AL.: "Metal and counteranion nuclearity effects in organoscandium-catalyzed isoprene polymerization and copolymerization", ACS CATALYSIS, vol. 7, 2017, pages 5 214 - 5219, XP055589802
LI, X. F. ET AL.: "Alternating and random copolymerization of isoprene and ethylene catalyzed by cationic half-sandwich scandium alkyls", JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 131, 2009, pages 13870 - 13882, XP055075033, DOI: 10.1021/ja9056213
PAN, L. ET AL.: "Chain-shuttling polymerization at two different scandium sites: regio- and stereospecific ''One-Pot'' block copolymerization of styrene, isoprene, and butadiene", ANGEWANDTE CHEMIE , INTERNATIONAL EDITION, vol. 50, 2011, pages 12012 - 12015, XP055150939
LIU, S. Q. ET AL.: "Cationic tropidinyl scandium catalyst: a perfectly acceptable substitute for cationic half-sandwich scandium catalysts in cis- 1,4-polymerization of isoprene and copolymerization with norbornene", MACROMOLECULES, vol. 47, 2014, pages 3567 - 3573, XP055747384
See also references of EP 3954718A4
ZHANG, L. X. ET AL.: "Unprecedented isospecific 3,4-polymerization of isoprene by cationic rare earth metal alkyl species resulting from a binuclear precursor", JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 127, 2005, pages 14562 - 14563, XP055747400
CHEN, J. Z. ET AL.: "Metal and counteranion nuclearity effects in organoscandium-catalyzed isoprene polymerization and copolymerization", ACS CATALYSIS, vol. 7, 2017, pages 5 214 - 5219, XP055589802
LI, X. F. ET AL.: "Alternating and random copolymerization of isoprene and ethylene catalyzed by cationic half-sandwich scandium alkyls", JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 131, 2009, pages 13870 - 13882, XP055075033, DOI: 10.1021/ja9056213
PAN, L. ET AL.: "Chain-shuttling polymerization at two different scandium sites: regio- and stereospecific ''One-Pot'' block copolymerization of styrene, isoprene, and butadiene", ANGEWANDTE CHEMIE , INTERNATIONAL EDITION, vol. 50, 2011, pages 12012 - 12015, XP055150939
LIU, S. Q. ET AL.: "Cationic tropidinyl scandium catalyst: a perfectly acceptable substitute for cationic half-sandwich scandium catalysts in cis- 1,4-polymerization of isoprene and copolymerization with norbornene", MACROMOLECULES, vol. 47, 2014, pages 3567 - 3573, XP055747384
See also references of EP 3954718A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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