Electrophotographic developer set comprising toner and powder adhesive, method for producing bonded product, and powder adhesive
An electrophotographic developer set comprising a toner comprising a thermoplastic resin and a wax, and a powder adhesive comprising a thermoplastic resin and a wax, wherein 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.
1. An electrophotographic developer set comprising
a toner comprising a thermoplastic resin and a wax; and
a powder adhesive comprising a thermoplastic resin and a wax, wherein
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 formulae:
0.00≤ Ea≤ 2.45,
2.50≤ Eb≤ 3.60, and
0.80≤ Nb/Na.
2. The electrophotographic developer set according to claim 1 , wherein the Ea and the Eb satisfy:
0.50≤ Eb−Ea≤ 3.40.
3. The electrophotographic developer set according to claim 1 , wherein the wax in the powder adhesive comprises at least one selected from the group consisting of an ester wax represented by formula (1) and an ester wax represented by formula (2):
where:
in the formula (1), 1 represents a positive integer from 2 to 12, and n and m each independently represents a positive integer from 12 to 20; and
in the formula (2), p represents a positive integer from 2 to 10, and q and r each independently represents a positive integer from 11 to 21.
4. The electrophotographic developer set according to claim 3 , wherein the wax in the powder adhesive comprises the ester wax represented by the formula (1), and in the formula (1), 1 represents 2, and n and m each independently represents a positive integer of 14 to 20.
5. The electrophotographic developer set according to claim 3 , wherein a content Nb1 of the ester wax in the powder adhesive is 8.0 to 20.0 mass %.
6. The electrophotographic developer set according to claim 3 , wherein the wax in the powder adhesive further comprises a chain saturated hydrocarbon having a peak carbon number from 20 to 70.
7. The electrophotographic developer set according to claim 1 , wherein the content Nb of the wax in the powder adhesive is 8.0 to 20.0 mass %.
8. The electrophotographic developer set according to claim 1 , wherein a content of the wax in the toner is 2.0 to 15.0 mass %.
9. The electrophotographic developer set according to claim 1 , wherein the wax in the toner comprises an ester compound of a monoalcohol having 18 to 24 carbon atoms and a monocarboxylic acid having 18 to 24 carbon atoms.
10. The electrophotographic developer set according to claim 1 , wherein the thermoplastic resin in the toner and the powder adhesive comprises at least one selected from the group consisting of a polyester resin and a styrene-acrylic resin.
11. 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 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 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 further comprises, after the forming and the fixing of the toner image portion and the adhesive portion, steps of:
overlaying the paper so as to interpose the adhesive portion; and
melting the adhesive portion thereby bonding the paper to obtain the bonded product.
12. A powder adhesive comprising:
a thermoplastic resin;
a compound represented by formula (1):
where, in the formula (1), 1 represents 2, and n and m each independently represents 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 the 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≤ Nb 1/ Nb 2≤25.00