Method for producing alkenyl ether polymer

A macro chain transfer agent comprising at least an end structure comprising a dithiocarbamate group represented by formula (3):

• wherein R1 and R2 each independently represent an alkyl group, an aryl group, or a nitrogen-containing heterocyclic group, or R1 and R2 may be bonded to each other to form a heterocyclic ring, and a repeating unit derived from a hydroxyl group-containing alkenyl ether represented by formula (4):
• wherein R3, R4, and R3 each independently represent a hydrogen atom or an alkyl group;
• R6 represents a linear or branched alkylene group or an alkylene group comprising an alicyclic structure;
• and p represents 1, 2, or 3.

A macro chain transfer agent capable of performing reversible addition fragmentation chain transfer polymerization represented by formula (5):

• wherein Q2 represents a functional group capable of activating vinyl carbon for free radical addition through detachment as a radical;
• R1 and R2 each independently represent an alkyl group, an aryl group, or a nitrogen-containing heterocyclic group, or R1 and R2 may be bonded to each other to form a heterocyclic ring;
• R3, R4, and R5 each independently represent a hydrogen atom or an alkyl group;
• R6 represents a linear or branched alkylene group or an alkylene group compromising an alicyclic structure;
• n represents a number of repetition of an alkenyl ether unit;
• and p represents 1, 2, or 3.