Asymmetric alpha-diimine nickel complex for synthesizing polyolefin elastomer, intermediate as well as preparation method and application of asymmetric alpha-diimine nickel complex

By developing asymmetric α-diimine nickel complex catalysts, the problem of insufficient thermal stability of existing catalysts at high temperatures is solved, and effective regulation of the molecular weight and branching degree of polyethylene is achieved, with high catalytic activity and low cost.

CN119708080APending Publication Date: 2025-03-28CHEM & CHEM ENG GUANGDONG LAB
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Patent Information

Application Number
CN202311273076.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-28
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing transition metal catalysts after α-diimine group have limited thermal stability at high temperatures, making it difficult to effectively control the molecular weight and branching degree of polyethylene.

Method used

An asymmetric α-diimine nickel complex catalyst with a single catalytic activity center that regulates the molecular weight and branching degree of the polymer by changing the ligand structure and maintains high catalytic activity at 100°C.

Benefits of technology

Effective control of the molecular weight and branching degree of polyethylene at high temperatures is achieved, with high catalytic activity, low cost and good thermal stability. The polyethylene generated during catalytic ethylene polymerization has excellent mechanical properties.

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Abstract

The invention discloses an asymmetric alpha-diimine nickel complex for synthesizing a polyolefin elastomer, an intermediate as well as a preparation method and application of the asymmetric alpha-diimine nickel complex, the asymmetric alpha-diimine nickel complex has a single catalytic activity center, and the molecular weight and branching degree of a polymer can be regulated and controlled by changing the structure of the asymmetric alpha-diimine nickel complex; and the catalyst also has the advantages of high catalytic activity, low cost and excellent thermal stability, and has a wide application prospect in the aspect of polyolefin material synthesis.
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