Electrophotographic toner, method of manufacturing the same, electrophotographic developer, and image forming method
AssigneeFuji Xerox Co., Ltd.
InventorsKatsumi Daimon, Norihito Fukushima, Takashi Imai, Manabu Serizawa, Hirokazu Hamano, Masanori Ichimura
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Abstract
An electrophotographic toner contains a colorant and a binder resin which includes and a crystalline polyester resin as a main component. An ester density M of the crystalline polyester resin, as defined in the following Formula 1, is from 0.01 to 0.12: M=K/A Formula 1 wherein M denotes an ester density, K denotes a number of ester groups, and A denotes a number of atoms which constitute the high molecular chain of a polymer.
Claims14
An electrophotographic toner comprising a binder resin and a colorant, the binder resin including a crystalline polyester resin which comprises, as a copolycondensation component, a dicarboxylic acid including a sulfonic acid group and/or a diol including a sulfonic acid group as a main component, and an ester density M of the crystalline polyester resin, which is defined in Formula 1 as follows, being from 0.01 to 0.12:
- M=K/A Formula 1
- wherein M denotes the ester density, K denotes a number of ester groups in a polymer, and A denotes a number of atoms constituting a chain of the polymer, including oxygen atoms which relate to the ester linkage but not including branched chains, hydrogen atoms, and other substituents bonded to the chain of the polymer, and
- wherein the toner has a temperature interval in which values of a storage modulus GL and a loss modulus GN change to one hundredth or smaller of the original values at a temperature range of 10° C. when the temperature of the toner is raised.
A method of preparing an electrophotographic toner comprising a colorant and a binder resin, the method comprising the steps of:
- emulsifying a crystalline polyester resin and colorant;
- aggregating and coalescing the emulsified crystalline polyester resin and colorant;
- and
- adjusting the crystalline polyester resin and colorant to toner size;
- wherein, the binder resin includes the crystalline polyester resin as a main component, and the crystalline polyester resin comprises, as a copolycondensation component, a dicarboxylic acid including a sulfonic acid group and/or a diol including a sulfonic acid group, and an ester density M of the crystalline polyester resin, which is defined in Formula 1 as follows, being from 0.01 to 0.12:
- M=K/A Formula 1
- wherein M denotes the ester density, K denotes a number of ester groups in a polymer, and A denotes a number of atoms constituting a chain of the polymer, including oxygen atoms which relate to the ester linkage but not including branched chains, hydrogen atoms, and other substituents bonded to the chain of the polymer, and
- wherein the toner has a temperature interval in which values of a storage modulus GL and a loss modulus GN change to one hundredth or smaller of the original values at a temperature range of 10° C. when the temperature of the toner is raised.
An image forming method, comprising the steps of:
- forming an electrostatic latent image on a surface of a latent image holding material;
- providing a developer comprising an electrophotographic toner including a colorant and a binder resin, and the binder resin comprising a crystalline polyester resin as a main component, wherein, the crystalline polyester resin comprises, as a copolycondensation component, a dicarboxylic acid including a sulfonic acid group and/or a diol including a sulfonic acid group, and an ester density M of the crystalline polyester resin, which is defined in Formula 1 as follows, is from 0.01 to 0.12:
- M=K/A Formula 1
- wherein M denotes the ester density, K denotes a number of ester groups in a polymer, and A denotes a number of atoms constituting a chain of the polymer, including oxygen atoms which relate to the ester linkage but not including branched chains, hydrogen atoms, and other substituents bonded to the chain of the polymer, and wherein the toner has a temperature interval in which values of a storage modulus GL and a loss modulus GN change to one hundredth or smaller of the original values at a temperature range of 10° C. when the temperature of the toner is raised;
- forming a toner image from the electrostatic latent image formed on the surface of the latent image holding material by using the developer held on a developer holding member;
- transferring the toner image formed on the surface of the latent image holding material onto a surface of a transfer material;
- and
- heat-fixing the toner image transferred on the surface of the transfer material.
A method of preparing an electrophotographic toner comprising a colorant and a binder resin, the method comprising the steps of:
- emulsifying a crystalline polyester resin;
- adding a colorant and aggregating and coalescing the emulsified crystalline polyester resin and colorant;
- and
- adjusting the crystalline polyester resin and colorant to toner size;
- wherein, the binder resin includes the crystalline polyester resin as a main component, and
- wherein, the crystalline polyester resin comprises, as a copolycondensation component, a dicarboxylic acid including a sulfonic acid group and/or a diol including a sulfonic acid group, and an ester density M of the crystalline polyester resin, which is defined in Formula 1 as follows, being from 0.01 to 0.12:
- M=K/A Formula 1
- wherein M denotes the ester density, K denotes a number of ester groups in a polymer, and A denotes a number of atoms constituting a chain of the polymer, including oxygen atoms which relate to the ester linkage but not including branched chains, hydrogen atoms, and other substituents bonded to the chain of the polymer, and
- wherein the toner has a temperature interval in which values of a storage modulus GL and a loss modulus GN change to one hundredth or smaller of the original values at a temperature range of 10° C. when the temperature of the toner is raised.
Dependencies are inferred from the claim text.