Binder resin for toner, toner and method for producing same

1. A binder resin for a toner comprising a carboxyl group-containing vinyl resin (C), a glycidyl group-containing vinyl resin (E), a reaction product of the vinyl resins and a saturated crystalline polyester (S), wherein said saturated crystalline polyester (S) has a melting point of equal to or more than 75 degrees centigrade and equal to or less than 120 degrees centigrade,

a metal component (M) selected from Zn, Ca, Mg, Al and Ba (however, excluding metal oxide) is dispersed in said saturated crystalline polyester (S), and

the loss modulus (G″) of said binder resin for a toner at 120 degrees centigrade is equal to or more than 0.3×10 4 Pa and equal to or less than 2.7×10 4 Pa at a measurement frequency of 6.28 rad/sec, and the minimum value of the storage modulus (G′) at equal to or more than 50 degrees centigrade and equal to or less than 200 degrees centigrade is equal to or more than 1.0×10 2 Pa and equal to or less than 1.5×10 4 Pa.

2. The binder resin for a toner according to claim 1 , wherein said metal component (M) is contained in an amount of equal to or more than 0.011 mass % and equal to or less than 1 mass %, based on the total weight of 100 mass % of said carboxyl group-containing vinyl resin (C), said glycidyl group-containing vinyl resin (E), a reaction product of the vinyl resins and said saturated crystalline polyester (S).

3. The binder resin for a toner according to claim 1 , wherein said metal component (M) is derived from an organic metal salt.

4. The binder resin for a toner according to claim 1 , wherein said metal component (M) is derived from a fatty acid metal salt represented by the following general formula,

(C n H 2n+1 COO) m −M

wherein, in the formula, n is an integer of 11 to 22; m is an integer of 2 to 3; and M is a metal selected from Zn, Ca, Mg, Al and Ba.

5. The binder resin for a toner according to claim 1 , having one peak of the loss modulus (G″) at equal to or more than 70 degrees centigrade and equal to or less than 85 degrees centigrade at a measurement frequency of 6.28 rad/sec.

6. The binder resin for a toner according to claim 1 , comprising a releasing agent having a melting point at equal to or less than the melting point of said saturated crystalline polyester (S).

7. The binder resin for a toner according to claim 6 , wherein the melting point of said releasing agent is equal to or more than −50 degrees centigrade and equal to or less than 0 degree centigrade relative to the melting point of said saturated crystalline polyester (S), and

said releasing agent is contained in an amount of equal to or more than 1 mass % and equal to or less than 10 mass %, based on the total weight of 100 mass % of said carboxyl group-containing vinyl resin (C), said glycidyl group-containing vinyl resin (E), a reaction product of the vinyl resins, and said saturated crystalline polyester (S).

8. The binder resin for a toner according to claim 1 , wherein said saturated crystalline polyester (S) is obtained by subjecting an alcohol component selected from aliphatic diols having 2 to 4 carbon atoms and a carboxylic acid component selected from aliphatic dicarboxylic acids having 4 to 6 carbon atoms to polycondensation.

9. The binder resin for a toner according to claim 1 , wherein said saturated crystalline polyester (S) is contained in an amount of equal to or more than 1 mass % and equal to or less than 25 mass %, based on the total weight of 100 mass % of said carboxyl group-containing vinyl resin (C), said glycidyl group-containing vinyl resin (E), a reaction product of the vinyl resins and said saturated crystalline polyester (S).

10. The binder resin for a toner according to claim 1 , wherein said saturated crystalline polyester (S) has a main peak in the molecular weight region of equal to or more than 5,000 and equal to or less than 15,000 in the molecular weight distribution measured by gel permeation chromatography (GPC) of the chloroform soluble content, and

the acid value of said saturated crystalline polyester (S) is equal to or more than 25 mgKOH/g and equal to or less than 70 mgKOH/g.

11. The binder resin for a toner according to claim 1 , wherein the tetrahydrofuran (THF) soluble content in said binder resin for a toner has a main peak in the molecular weight region of equal to or more than 3,000 and less than 25,000 in the molecular weight distribution measured by gel permeation chromatography (GPC),

the THF insoluble content in said binder resin for a toner is contained in an amount of equal to or more than 3 mass % and less than 30 mass %, and

the acid value of said binder resin for a toner is equal to or more than 4.5 mgKOH/g and equal to or less than 30 mgKOH/g.

12. The binder resin for a toner according to claim 1 , wherein said carboxyl group-containing vinyl resin (C) contains a high molecular weight vinyl resin (H) in which the THF soluble content has a peak in the molecular weight region of equal to or more than 150,000 and less than 350,000 in the chromatogram obtained by GPC and a low molecular weight vinyl resin (L) in which the THF soluble content has a peak in the molecular weight region of equal to or more than 3,000 and less than 25,000 in the chromatogram obtained by GPC,

the mass ratio (H/L) of said high molecular weight vinyl resin (H) to said low molecular weight vinyl resin (L) in said carboxyl group-containing vinyl resin (C) is equal to or more than 10/90 and equal to or less than 50/50,

the acid value of said carboxyl group-containing vinyl resin (C) is equal to or more than 3 mgKOH/g and equal to or less than 25 mgKOH/g,

the THF soluble content of said glycidyl group-containing vinyl resin (E) has a peak in the molecular weight region of equal to or more than 30,000 and equal to or less than 70,000 in the chromatogram obtained by GPC and the epoxy value is equal to or more than 0.003 Eq/100 g and equal to or less than 0.100 Eq/100 g, and

the mass ratio (C/E) of said carboxyl group-containing vinyl resin (C) to said glycidyl group-containing vinyl resin (E) is equal to or more than 87/13 and equal to or less than 99/1.

13. A toner comprising a binder resin for a toner and a coloring agent, wherein the loss modulus (G″) at 120 degrees centigrade is equal to or more than 0.3×10 4 Pa and equal to or less than 2.7×10 4 Pa at a measurement frequency of 6.28 rad/sec,

the minimum value of the storage modulus (G′) at equal to or more than 50 degrees centigrade and equal to or less than 200 degrees centigrade is equal to or more than 1.0×10 2 Pa and equal to or less than 1.5×10 4 Pa, and

said binder resin for a toner is the binder resin for a toner according to claim 1 .

14. The toner according to claim 13 , having one peak of the loss modulus (G″) at equal to or more than 70 degrees centigrade and equal to or less than 85 degrees centigrade at a measurement frequency of 6.28 rad/sec.

15. The toner according to claim 13 , wherein the tetrahydrofuran (THF) soluble content of said toner has a main peak in the molecular weight region of equal to or more than 2,000 and less than 25,000 in the molecular weight distribution measured by gel permeation chromatography (GPC), and

the THF insoluble content derived from said binder resin for a toner is contained in an amount of equal to or more than 3 mass % and less than 30 mass %.

16. A method for producing a binder resin for a toner according to claim 1 , comprising:

obtaining a mixture with the addition of an organic metal salt to a saturated crystalline polyester (S), and

mixing said obtained mixture, a carboxyl group-containing vinyl resin (C) and a glycidyl group-containing vinyl resin (E).

17. A method for producing a toner comprising:

obtaining a binder resin for a toner, and

mixing said binder resin for a toner and a coloring agent,

in which said binder resin for a toner is obtained according to the production method according to claim 16 .

18. A binder resin for a toner comprising a carboxyl group-containing vinyl resin (C), a glycidyl group-containing vinyl resin (E), a reaction product of the vinyl resins and a saturated crystalline polyester (S), wherein said saturated crystalline polyester (S) has a melting point of equal to or more than 75 degrees centigrade and equal to or less than 120 degrees centigrade,

a metal component (M) selected from Zn, Ca, Mg, Al and Ba (however, excluding metal oxide) is dispersed in said saturated crystalline polyester (S), and

the loss modulus (G″) of said binder resin for a toner at 120 degrees centigrade is equal to or more than 0.3×10 4 Pa and equal to or less than 2.7×10 4 Pa at a measurement frequency of 6.28 rad/sec, and the minimum value of the storage modulus (G′) at equal to or more than 50 degrees centigrade and equal to or less than 200 degrees centigrade is equal to or more than 1.0×10 2 Pa and equal to or less than 1.5×10 4 Pa,

wherein said metal component (M) is contained in an amount of equal to or more than 0.011 mass % and equal to or less than 1 mass %, based on the total weight of 100 mass % of said carboxyl group-containing vinyl resin (C), said glycidyl group-containing vinyl resin (E), a reaction product of the vinyl resins and said saturated crystalline polyester (S),

wherein said metal component (M) is derived from a fatty acid metal salt represented by the following general formula,

(C n H 2n+1 COO) m −M

wherein, in the formula, n is an integer of 11 to 22; m is an integer of 2 to 3; and M is a metal selected from Zn, Ca, Mg, Al and Ba.