The present invention relates to a method that enables the production of a uniform polymer of high molar mass from cyclic imino ether monomer. This method comprises the following steps: a) providing a first liquid reaction mixture comprising cyclic imino ether monomer and optionally solvent； b) polymerizing cyclic imino ether monomer in the first reaction mixture by cationic ring opening polymerization to produce a polymerized first reaction mixture containing (i) polymerized material and (ii) solvent and/or unreacted cyclic imino ether monomer； c) separating solvent and/or unreacted cyclic imino ether monomer from polymerized material contained in the polymerized first reaction mixture； d) providing a second liquid reaction mixture containing cyclic imino ether monomer and solvent by combining the separated unreacted cyclic imino ether monomer and/or the separated solvent with other components； and e) polymerizing the cyclic imino ether monomer in the second reaction mixture by cationic ring opening polymerization. The invention also provides a polyoxazoline polymer comprising at least 50 wt.% of repeating units derived from a 2-substituted 2-oxazoline monomer selected from 2-methyl-2-oxazoline, 2-ethyl-2-oxazoline, 2-n-propyl-2-oxazoline, 2-i-propyl-2-oxazoline and combinations thereof, said polymer having a DP of at least 250 and a very low dispersity.La présente invention concerne un procédé qui permet la production d'un polymère uniforme de masse molaire élevée à partir d'un monomère d'iminoéther cyclique. Ce procédé comprend les étapes suivantes : a) fourniture d'un premier mélange de réaction liquide comprenant un monomère d'iminoéther cyclique et facultativement un solvant ； b) polymérisation de monomère d'iminoéther cyclique dans le premier mélange de réaction par polymérisation par ouverture de cycle cationique pour produire un premier mélange de réaction polymérisé contenant (i) un matériau polymérisé et (ii) un solvant et/ou le monomère d'iminoéther cycl
