## 4 Conclusions  
Data on the ethylene-1-hexene copolymerization kinetics of four modifications of supported titanium-magnesium catalysts have been obtained. These catalysts contain titanium chloride compounds with different oxidation states and coordination states of titanium ions. It was found that catalysts with the active component represented by mononuclear Ti(II) compounds having the TiCl\({}_{2}\)-2 AlCl\({}_{3}\) composition (the TMC-1 catalyst) and mononuclear compounds of Ti(III) having the TiCl\({}_{3}\)-2 AlCl\({}_{3}\) composition (the TMC-1-2 catalyst) possess a higher copolymerizing ability compared to conventional catalysts containing associates of Ti(III) ions (the (TiCl\({}_{3}\))\({}_{2}\)) structure as the active component (the TMC-2 and TMC-3 catalysts). The TMC-1 catalyst was shown to produce the ethylene-1-hexene copolymer with a more uniform branching distribution as compared to the TMC-3 catalyst. It was found that the TMC-1 catalyst allows for the high yield of the X-ray amorphous ethylene-propylene copolymer with a propylene content of 42 mol.%. The increased copolymerizing ability of the TMC-1 catalyst in the copolymerization of ethylene with 1-hexene and propylene may be determined by the formation of the active component with the AlCl\({}_{3}\) TiCl\({}_{2}\)-AlCl\({}_{3}\) structure.  
\begin{table}
\begin{tabular}{c c c c c} \hline \multirow{2}{*}{**Exp. No.**} & \multirow{2}{*}{**Catalyst**} & **Yield 1,** & **M\({}_{\mathbf{w}}\)** & **M\({}_{\mathbf{w}}\)/** & **(C\({}_{3}\)H\({}_{6}\))\({}_{\mathbf{pol},}\)** \\  & & **kg EPC/(g cat \(\times\) h)** & **kg/mol** & **M\({}_{\mathbf{n}}\)** & **mol.\%** \\ \hline
1 & TMC-1 & 2.4 & 170 & 11.3 & 42 \\
2 & TMC-1-2 & 2.6 & 210 & 11.6 & 32 \\
3 & TMC-3 & 1.7 & 190 & 8.3 & 25 \\ \hline \end{tabular}  
* Polymerization conditions: n-heptane, 70 \({}^{\circ}\)C, [TIIBA] = 4.8 mmol/L, pressure of comonomers, 3 atm, C\({}_{3}\)/C\({}_{2}\) = 0.49 mol/mol, 1 h. The content of propylene in the reaction mixture before the experiments was 64.5 mol.%.  
\end{table}
Table 4: Data on the copolymerization of ethylene with propylene, composition, and molecular weight characteristics of copolymers obtained over catalysts of different compositions.  
Figure 3: The content of butyl branching in the fractions of copolymers produced on the catalysts of different compositions.  
**Author Contributions:** Conceptualization, T.B.M. and V.A.Z.; methodology, M.A.M.; validation, T.B.M., V.A.Z. and M.A.M.; formal analysis, M.A.M. and T.B.M.; investigation, P.G. and T.B.M.; resources, M.A.M.; data curation, V.A.Z.; writing--original draft preparation, T.B.M.; writing--review and editing, T.B.M., V.A.Z. and M.A.M.; supervision, V.A.Z.; project administration, M.A.M. All authors have read and agreed to the published version of the manuscript.  
**Funding:** This research was funded by the MINISTRY OF SCIENCE AND HIGHER EDUCATION OF THE RUSSIAN FEDERATION (project AAAA21-121011490008-3).  
**Institutional Review Board Statement:** Not applicable.  
**Informed Consent Statement:** Not applicable.  
**Data Availability Statement:** All needed data are in the manuscript. No additional data are required.  
**Acknowledgments:** The authors thank [PERSON], [PERSON], and [PERSON] for the analysis of molecular weight characteristics of PE.  
**Conflicts of Interest:** The authors declare no conflict of interest.