Method for manufacturing chloroprene-based polymer composition, chloroprene-based polymer composition, dip-molded body and method for manufacturing dip-molded body

A method for producing a chloroprene-based polymer composition containing chloroprene-based polymer, comprising a polymerization step, wherein:

• in the polymerization step, chloroprene, or chloroprene and a monomer copolymerizable with chloroprene, are polymerized until reaching polymerization completion conversion;
• the polymerization step includes a monomer addition step and an emulsifier addition step,
• when a total amount of monomer used in the polymerization step is 100%, an initial addition amount of monomer at start of polymerization is X %;
• in the monomer addition step, when the initial addition amount of the monomer is 100%, a remaining monomer is added to the polymerization system from time when polymerization progresses and Y % of the monomer initially added converts, by reaching the polymerization completion conversion;
• in the emulsifier addition step, when the total amount of monomer used in the polymerization step is 100%, emulsifier is added from time when polymerization progresses and Z % of the monomer converts by reaching the polymerization completion conversion;
• and
• X, Y and Z satisfy following relationship.
• 1
• ≤
• XY
• /
• 100
• ≤
• 40
• ⁢
• 20
• ≤
• Z
• ≤
• 75
• ⁢
• -
• 65
• ≤
• Y
• -
• Z
• ≤
• 50