Pressure sensitive adhesive, toner for developing electrostatic charge image, method for producing pressure sensitive adhesive, method for producing toner for developing electrostatic charge image, and bonded product

A pressure sensitive adhesive comprising:

• i) composite resin particles that contain, in a polymerized form:
• a styrene resin containing, as polymerization components, styrene, butyl acrylate, and acrylic acid,
• a (meth)acrylate resin containing, as polymerization components, di(meth)acrylate, butyl acrylate, 2-ethylhexyl acrylate, and styrene, and
• a chain transfer agent, and
• ii) an aqueous solvent containing water;
• wherein:
• a mass ratio of the styrene resin to the (meth)acrylate resin (styrene resin:(meth)acrylate resin) is 80:20 to 20:80,
• a difference between the lowest glass transition temperature and the highest glass transition temperature of the composite resin particles is 30° C. or more,
• a melt viscosity of the composite resin particles at 100° C. is 4000 Pa·s or more and 20000 Pa·s or less,
• in a melt viscosity range of the composite resin particles of 4000 Pa·s or more and 20000 Pa·s or less, a slope of a logarithm of the melt viscosity of the composite resin particles relative to a temperature of the composite resin particles is −0.08 or more and −0.04 or less,
• the composite resin particles have a gel fraction of 0.1 mass % or more and 2 mass % or less,
• a ratio of a content of the di(meth)acrylate to a content of the chain transfer agent in the methacrylate resin of the composite resin particles is from 0.1 to 1.0, and
• the chain transfer agent comprises at least one selected from the group consisting of hexylthiol, heptanethiol, octanethiol, nonanethiol, decanethiol, dodecanethiol, tetradecanethiol, and hexadecanethiol.