The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 16, 2020
Filed:
Mar. 25, 2019
Changchun Institute of Applied Chemistry Chinese Academy of Sciences, Changchun, CN;
Abstract
A copolymer of ethylene and a conjugated diene is provided, in which ethylene content in the copolymer is greater than 20 mol %, the copolymer has a glass transition temperature between −110° C. and −90° C., and continuous methylene sequence lengths (MSL) in the copolymer are in a range of 12-162 methylene units. A method for producing the copolymer, comprising copolymerizing ethylene and a conjugated diene in the presence of a catalyst system to obtain the copolymer is also provided, in which the catalyst system comprises a heterocyclic-fused cyclopentadienyl rare-earth metal complex, an organoboron salt compound and an organoaluminum compound, wherein the heterocyclic-fused cyclopentadienyl rare-earth metal complex is represented by the structural formula: