Chloroprene graft copolymer latex, method for producing same, bonding agent and adhesive

A method for producing a chloroprene graft copolymer latex, the method comprising:

• a chloroprene polymerization step of subjecting monomer material consisting of (i) chloroprene (A-1) or (ii) chloroprene (A-1) and a monomer (A-2) copolymerizable with chloroprene (A-1) to emulsion radical polymerization to give a chloroprene polymer, and yielding a chloroprene polymer latex in which particles of the chloroprene polymer are dispersed in water;
• and
• a graft copolymerization step of adding, to the chloroprene polymer latex, a (meth)acrylate (B) represented by general formula:
• CH2═CR—CO—OR′ (in the general formula, R is a methyl group or a hydrogen atom;
• and R′ is an alkyl group having a carbon number of 4 or more and 12 or less), adding, as a polymerization initiator, an organic peroxide (C) having an octanol/water partition coefficient of −2.0 or more and 3.0 or less to subject the chloroprene polymer to graft copolymerization with the (meth)acrylate (B) at a temperature of 10° C. or more and 40° C. or less to give a chloroprene graft copolymer, and yielding a chloroprene graft copolymer latex in which particles of the chloroprene graft copolymer are dispersed in water;
• wherein the chloroprene polymer latex contains no organic solvent, and
• wherein the monomer (A-2) is selected from the group consisting of 2,3-dichloro-1,3-butadiene, 1-chloro-1,3-butadiene, butadiene, isoprene, styrene, methacrylic acid, acrylic acid, itaconic acid, 2-ethylmethacrylic acid and 2-butylacrylic acid.