Electrophotographic developer set comprising toner and powder adhesive, and method for producing bonded product

A method for producing a bonded product resulting from bonding at least one sheet of paper via an adhesive portion by using an electrophotographic developer set, wherein:

• the electrophotographic developer set comprises:
• a toner;
• and
• a powder adhesive;
• the powder adhesive comprises:
• a crystalline polyester resin;
• and
• a thermoplastic resin other than the crystalline polyester resin;
• an amount of the crystalline polyester resin in the powder adhesive is 21% by mass or more;
• a melting point of the crystalline polyester resin is 55° C. to 100° C.;
• and
• in a viscoelasticity measurement,
• where Gt′(100) denotes a storage elastic modulus of the toner at 100° C. and Gb′(100) denotes a storage elastic modulus of the powder adhesive at 100° C.,
• Gb′(100) is 1.0×105 Pa or less and
• Gt′(100)/Gb′(100) is 1.2 or more, wherein
• the bonded product has:
• a surface A on which an adhesive portion of the powder adhesive is fixed, and a surface B on which a toner image portion of the toner is fixed, the surface B being a surface different from the surface A, wherein
• the method comprises, in no particular order:
• forming the toner image portion on the surface B, and fixing the toner image portion on the surface B by heating;
• and
• forming the adhesive portion on the surface A, and fixing the adhesive portion on the surface A by heating, and wherein
• the method further comprises, after the forming and the fixing of the toner image portion and the adhesive portion:
• overlaying the paper so as to interpose the adhesive portion;
• and
• melting the adhesive portion thereby bonding the paper to obtain the bonded product.