Toner for developing electrostatic charge image
AssigneeKao Corporation
InventorsYuta IZUMIYA, Shogo NOMOTO
Life of this patent
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Abstract
The present invention relates to a toner for development of electrostatic images which contains a colorant, a resin composition (P) and a resin composition (W), in which the resin composition (P) is a resin composition formed by subjecting an acid group-containing amorphous polyester-based resin (A) and an amine compound to condensation reaction, and the resin composition (W) is a resin composition formed by subjecting an alcohol component (W-al), a carboxylic acid component (W-ac) and a hydrocarbon wax containing at least one functional group selected from the group consisting of a hydroxy group and a carboxy group to condensation reaction; and a process for producing the toner.
Claims20
1:
- A toner for development of electrostatic images, comprising a colorant, a resin composition (P), and a resin composition (W), wherein:
- the resin composition (P) is a resin composition formed by subjecting an acid group-containing amorphous polyester-based resin (A) and an amine compound to condensation reaction;
- and
- the resin composition (W) is a resin composition formed by subjecting an alcohol component (W-al), a carboxylic acid component (W-ac), and a hydrocarbon wax comprising at least one functional group selected from the group consisting of a hydroxy group and a carboxy group to condensation reaction.
2:
- The toner for development of electrostatic images according to claim 1, wherein the amine compound comprises at least one compound selected from the group consisting of a polyalkyleneimine comprising an alkylene group comprising not less than 1 and not more than 5 carbon atoms, a polyallylamine, a (poly)ethylenepolyamine, and a tertiary alkanolamine comprising not less than 2 and not more than 9 carbon atoms.
3:
- The toner for development of electrostatic images according to claim 1, wherein the amine compound comprises the polyalkyleneimine comprising an alkylene group comprising not less than 1 and not more than 5 carbon atoms.
4:
- The toner for development of electrostatic images according to claim 1, wherein the amorphous polyester-based resin (A) is a polycondensate of an alcohol component (A-al) and a carboxylic acid component (A-ac), and the alcohol component (A-al) comprises an alkyleneoxide adduct of bisphenol A.
5:
- The toner for development of electrostatic images according to claim 1, wherein the hydrocarbon wax is the hydrocarbon wax comprising a hydroxy group.
6:
- The toner for development of electrostatic images according to claim 1, wherein a softening point of the amorphous polyester-based resin (A) is not lower than 80° C. and not higher than 120° C.
7:
- The toner for development of electrostatic images according to claim 1, further comprising an amorphous polyester-based resin (B) having a softening point that is higher than 120° C. and not higher than 170° C.
8:
- The toner for development of electrostatic images according to claim 1, wherein the toner for development of electrostatic images is a pulverized toner produced by a melt-kneading method.
9:
- A process for producing a toner for development of electrostatic images, the process comprising:
- 1:
- subjecting an acid group-containing amorphous polyester-based resin (A) and an amine compound to condensation reaction to obtain a resin composition (P);
- and
- 2:
- melt-kneading toner raw materials comprising the resin composition (P) obtained in 1, a colorant, and a resin composition (W),
- wherein the resin composition (W) is a resin composition formed by subjecting an alcohol component (W-al), a carboxylic acid component (W-ac) and a hydrocarbon wax comprising at least one functional group selected from the group consisting of a hydroxy group and a carboxy group to condensation reaction.
10:
- The process for producing a toner for development of electrostatic images according to claim 9, wherein the amine compound comprises at least one compound selected from the group consisting of a polyalkyleneimine comprising an alkylene group comprising not less than 1 and not more than 5 carbon atoms, a polyallylamine, a (poly)ethylenepolyamine, and a tertiary alkanolamine comprising not less than 2 and not more than 9 carbon atoms.
11:
- The process for producing a toner for development of electrostatic images according to claim 9, wherein the amine compound comprises the polyalkyleneimine comprising an alkylene group comprising not less than 1 and not more than 5 carbon atoms.
12:
- The process for producing a toner for development of electrostatic images according to claim 9, wherein the amorphous polyester-based resin (A) is a polycondensate of an alcohol component (A-al) and a carboxylic acid component (A-ac), and the alcohol component (A-al) comprises an alkyleneoxide adduct of bisphenol A.
13:
- The process for producing a toner for development of electrostatic images according to claim 9, wherein the hydrocarbon wax is the hydrocarbon wax comprising a hydroxy group.
14:
- The process for producing a toner for development of electrostatic images according to claim 9, wherein a softening point of the amorphous polyester-based resin (A) is not lower than 80° C. and not higher than 120° C.
15:
- The process for producing a toner for development of electrostatic images according to claim 9, wherein the toner for development of electrostatic images further comprises an amorphous polyester-based resin (B) having a softening point that is higher than 120° C. and not higher than 170° C.
16:
- The toner for development of electrostatic images according to claim 1, wherein a content of the resin composition (P) in the toner is not less than 10% by mass and not more than 60% by mass, wherein the content is calculated in terms of a content of the resin composition (P) on the basis of a total amount of the resin components present in the toner.
17:
- The toner for development of electrostatic images according to claim 1, wherein a content of the resin composition (W) in the toner is not less than 10% by mass and not more than 60% by mass, wherein the content is calculated in terms of a content of the resin composition (W) on the basis of a total amount of the resin components present in the toner.
18:
- The toner for development of electrostatic images according to claim 1, wherein a total content of the resin composition (P) and the resin composition (W) in the toner is not less than 40% by mass and not more than 90% by mass, wherein the content is calculated in terms of a total content of the resin composition (P) and the resin composition (W) on the basis of a total amount of the resin components present in the toner.
19:
- The toner for development of electrostatic images according to claim 1, wherein a mass ratio of the content of the resin composition (P) to the content of the resin composition (W) in the toner is not less than 0.3 and not more than 3.
20:
- The toner for development of electrostatic images according to claim 7, wherein a content of the resin (B) in the toner is not less than 10% by mass and not more than 60% by mass, wherein the content is calculated in terms of a content of the resin (B) on the basis of a total amount of the resin components contained in the toner.