abstract |
PROBLEM TO BE SOLVED: To provide a method for producing a resin composition for toner excellent in low-temperature fixability, high-temperature offset resistance and image quality, and to provide a resin composition for toner and toner. SOLUTION: A branched polyester (A) having a number average molecular weight of 2000 to 7000 and a hydroxyl value of 20 to 80, and a low molecular weight linear polyester (B) having a number average molecular weight of 2000 to 5000 and a hydroxyl value of 20 to 55. And a mixture of the branched polyester (A) and a branched structure obtained by reacting an isocyanate compound having two or more isocyanate groups in one molecule with a mixture of the branched polyester (A) and the branched structure. A resin composition for a toner, comprising a structure in which a polyester (A) and the low molecular weight linear polyester (B) are bonded by the isocyanate compound, and an unreacted material of the low molecular weight linear polyester (B). [Selection figure] None |