Polyester resin composition for toner and toner

A toner resin composition comprising a linear polyester resin (A) containing a C3 to C10 aliphatic diol component and having a softening temperature in the range of 150 to 220° C., a linear polyester resin (B) containing a C3 to C10 aliphatic diol component which differs from said linear polyester resin (A), and a vinyl-based resin (C), the (parts by mole of the C3 to C10 aliphatic diol component in the linear polyester resin (B))/(parts by mole of the C3 to C10 aliphatic diol component in the linear polyester resin (A)) in the case of designating the total acid component of the resin as 100 parts by mole being in a range of 0.5 to 10.

A toner linear polyester resin (a1) comprising a C3 to C10 aliphatic diol component in an amount of 10 to 30.5 parts by mole with respect to 100 parts by mole of the total carboxylic acid component, having a glass transition temperature in a range of 50 to 75° C., having a mass average molecular weight Mw in a range of 25,000 to 100,000, not having a melting point, having a softening temperature in a range of 150 to 220° C., and having an acid value of 10 mgKOH/g or less.

A method of production of a toner linear polyester resin (a1) comprising causing a dicarboxylic acid component and a diol component to react at a temperature of a range of 250 to 280° C. and under a pressure of a range of 200 kPa to 500 kPa by an esterification reaction, then causing condensation polymerization at a temperature in the range of 250 to 300° C. and 5° C. or more higher than the esterification reaction temperature under a pressure of 1 kPa or less.

A toner linear polyester resin (b1) comprised of a linear polyester resin comprised of a dicarboxylic acid component and a diol component, comprising an aromatic dicarboxylic acid in a total carboxylic acid component in an amount of 50 mol % or more, containing a C4 to C8 aliphatic diol in an amount of 60 parts by mole or more with respect to 100 parts by mole of the total carboxylic acid component, having a glass transition temperature in a range of 40 to 70° C., having a mass average molecular weight Mw in a range of 4,000 to 10,000, not having a melting point, and having a softening temperature in a range of 90 to 120° C., wherein the C4 to C8 aliphatic diol is neopentyl glycol.

A toner comprising a binding resin and a coloring agent, said toner characterized in that the binding resin is mainly comprised of polyester resin, the polyester resin contains a polyester resin (X) and a polyester resin (Y), a blending ratio of the polyester resin (X) and polyester resin (Y) is 5/95 to 95/5 (weight ratio), the polyester resin (X) is a linear polyester resin with a mass average molecular weight Mw of 25,000 to 100,000 and a softening temperature of 150 to 220° C., the polyester resin (Y) is a linear polyester resin with a mass average molecular weight Mw of 2,000 to 10,000, and a minimum fixing temperature is 130° C. or less and a range of fixing temperature is 40° C. or more.