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

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 comprising a thermoplastic resin and a wax, and
• a powder adhesive comprising a thermoplastic resin and a wax,
• where Ea (mmol/g) denotes an ester group concentration of the wax contained in the toner,
• Na (mass %) denotes a content of the wax in the toner,
• Eb (mmol/g) denotes an ester group concentration of the wax contained in the powder adhesive, and
• Nb (mass %) denotes a content of the wax in the powder adhesive,
• the Ea, the Na, the Eb and the Nb satisfy the following formulae:
• 0.00≤Ea≤2.45,
• 2.50≤Eb≤3.60, and
• 0.80≤Nb/Na, wherein
• the bonded product has
• a surface A on which an adhesive portion of the powder adhesive is fixed, and a toner image portion of the toner is fixed, wherein
• the method comprises the following steps (A) and (B):
• (A) forming the toner image portion and the adhesive portion on at least one surface of the surface A, and fixing the toner image portion and the adhesive portion by heating, and
• (B) forming the adhesive portion on one surface of the surface A and fixing the adhesive portion by heating, and forming the toner image portion on at least the other surface of the surface A and fixing the toner image portion by heating, and wherein
• the method comprises the following steps, after formation and fixation 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.

A powder adhesive comprising a thermoplastic resin, a compound represented by Formula (1), and in Formula (1), 1 represents 2, and n and m each independently represent a positive integer of 14 to 20, and a chain saturated hydrocarbon having a peak carbon number of 20 to 70, wherein

• the thermoplastic resin is a styrene-acrylic resin,
• a content of the thermoplastic resin in the powder adhesive is 75.0 to 92.0 mass %,
• a content Nb1 of the compound represented by Formula (1) in the powder adhesive is 8.0 to 20.0 mass %,
• a content Nb2 of the chain saturated hydrocarbon having a peak carbon number of 20 to 70 in the powder adhesive is 0.1 to 5.0 mass %, and
• the Nb1 and the Nb2 satisfy
• 2.00≤Nb1/Nb2≤25.00.