Resin for toner and toner
First Claim
Patent Images
1. A crystalline polyester resin for toner, satisfying the following relationships:
-
30≦
R≦
100
25≦
Tg≦
70
(Tg+273)/(Mp+273)≧
0.75, and
R=(IC20/IC)×
100,wherein R (%) represents a ratio of low diffraction angle components of the crystalline polyester resin for toner as calculated based on measurement by wide-angle X-ray diffraction,Tg (°
C.) represents a glass transition temperature of the crystalline polyester resin for toner,Mp (°
C.) represents a melting point of the crystalline polyester resin for toner,IC20 indicates the total area of crystalline peaks detected within a range of 5≦
2θ
≦
20,IC indicates the total area of crystalline peaks detected within a range of 5≦
2θ
≦
60, and2θ
indicates a diffraction angle (deg).
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Abstract
The present invention provides a crystalline polyester resin having a sharp melt property that realizes both fixing performance and blocking property and demonstrates favorable charging performance, in which the crystalline polyester resin for toner, satisfying the following relationships, 25≦Tg≦70, and (Tg+273)/(Mp+273)≧0.75, wherein Tg (° C.) represents a glass transition temperature of the crystalline polyester resin for toner, and Mp (° C.) represents a melting point of the crystalline polyester resin for toner.
44 Citations
13 Claims
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1. A crystalline polyester resin for toner, satisfying the following relationships:
-
30≦
R≦
100
25≦
Tg≦
70
(Tg+273)/(Mp+273)≧
0.75, and
R=(IC20/IC)×
100,wherein R (%) represents a ratio of low diffraction angle components of the crystalline polyester resin for toner as calculated based on measurement by wide-angle X-ray diffraction, Tg (°
C.) represents a glass transition temperature of the crystalline polyester resin for toner,Mp (°
C.) represents a melting point of the crystalline polyester resin for toner,IC20 indicates the total area of crystalline peaks detected within a range of 5≦
2θ
≦
20,IC indicates the total area of crystalline peaks detected within a range of 5≦
2θ
≦
60, and2θ
indicates a diffraction angle (deg). - View Dependent Claims (2, 3, 4, 5, 6, 7, 12)
-
-
8. A method for producing a toner,
the toner comprising a crystalline polyester resin for toner, the crystalline polyester resin for toner, satisfying the following relationships: -
25≦
Tg≦
70, and
(Tg+273)/(Mp+273)≧
0.75wherein Tg (°
C.) represents a glass transition temperature of the crystalline polyester resin for toner, and Mp (°
C.) represents a melting point of the crystalline polyester resin for toner, the method comprising;a resin dissolving step of obtaining a resin composition by dissolving, in an organic solvent, a polyester resin obtained by condensation polymerization of a dicarboxylic acid component containing at least one compound selected from the group consisting of terephthalic acid, 2,6-naphthalene dicarboxylic acid and derivatives thereof, and a diol component containing at least one compound selected from the group consisting of 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol and derivatives thereof; a granulating step of obtaining a dispersion by dispersing the resulting resin composition in an aqueous medium; and a solvent removal step of removing the organic solvent from the resulting dispersion. - View Dependent Claims (9, 10, 11)
-
-
13. A toner comprising a crystalline polyester resin, wherein the crystalline polyester resin satisfies the following relationships:
-
30≦
R≦
100
25≦
Tg≦
70
(Tg+273)/(Mp+273)≧
0.75, and
R=(IC20/IC)×
100,wherein R (%) represents a ratio of low diffraction angle components of the crystalline polyester resin for toner as calculated based on measurement by wide-angle X-ray diffraction, Tg (°
C.) represents a glass transition temperature of the crystalline polyester resin,Mp (°
C.) represents a melting point of the crystalline polyester resin,IC20 indicates the total area of crystalline peaks detected within a range of 5≦
2θ
≦
20,IC2 indicates the total area of crystalline peaks detected within a range of 5≦
2θ
≦
60, and2θ
indicates a diffraction angle (deg).
-
Specification