Synthetic polyisoprene and method of synthesizing polyisoprene
AssigneesThe Goodyear Tire & Rubber Company, Luxembourg Institute of Science and Technology
InventorsMarc Weydert, Nicolai Nikishkin, Alexander Shaplov
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Abstract
The present invention is directed to a synthetic polyisoprene which comprises isoprene repeat units comprising 1,4 isoprene repeat units and 3,4 isoprene repeat units. At least 5% of all isoprene repeat units of the synthetic polyisoprene are 3,4 isoprene repeat units and at least 96% of all 1,4 isoprene repeat units of the synthetic polyisoprene are cis 1,4 isoprene units. Moreover, the invention is directed to a method of synthesizing such a polyisoprene and a rubber composition comprising the synthetic polyisoprene.
Claims20
A synthetic polyisoprene which comprises isoprene repeat units comprising 1,4 isoprene repeat units and 3,4 isoprene repeat units,
- wherein at least 5% of all isoprene repeat units of the synthetic polyisoprene are 3,4 isoprene repeat units, and
- wherein at least 96% of all 1,4 isoprene repeat units of the synthetic polyisoprene are cis 1,4 isoprene units.
A method of synthesizing a polyisoprene, the method comprising at least the steps of:
- (A) Providing isoprene monomers;
- (B) Providing a catalyst comprising an organometallic compound according to formula (I):
- wherein
- M is a metal selected from Titanium, Zirconium and Hafnium;
- X is a ligand independently selected from one or more of a hydrocarbyl and a halogenide;
- and wherein
- LA and LB are independently substituted ligands according to formula (II):
- wherein
- R is independently selected from hydrogen, a hydrocarbyl substituent, a substituted hydrocarbyl substituent, and a heteroatom substituent,
- n is selected from 0, 1, 2, 3, and 4, and wherein
- m is selected from 0, 1, 2, 3, and 4;
- (C) Activating the catalyst to obtain an activated catalyst;
- and
- (D) Polymerizing the isoprene monomers with said activated catalyst.
Dependencies are inferred from the claim text.