Polyester resin for toner, toner composition and resin particles

A technology of polyester resin and resin granules, which is applied in developing agent, electrography, optics, etc., can solve problems such as insufficient viewpoints of low-temperature fixing characteristics, and achieve excellent storage stability, excellent anti-blocking property, and good resin performance Effect

Active Publication Date: 2007-01-10
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the toner proposed in this document is insufficient from the viewpoint of low-temperature fixing ch

Method used

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  • Polyester resin for toner, toner composition and resin particles
  • Polyester resin for toner, toner composition and resin particles

Examples

Experimental program
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Effect test

preparation example Construction

[0466] The method for producing the resin fine particles (Q) is not particularly limited, and for example, methods [1] to [8] exemplified below can be used. Methods [1] to [8] are methods for obtaining an aqueous dispersion of resin particles (Q), wherein the aqueous dispersion of resin particles (Q) can be directly used to prepare composite resin particles of the present invention, or resin particles (Q) It may be isolated from the aqueous dispersion alone, or the resin fine particles (Q) may be isolated during the preparation of the aqueous dispersion. The separation method can adopt filtration method, decantation method and centrifugation method.

[0467] [1] In the case of vinyl resins: use the monomer as the starting material, and in the presence of a polymerization catalyst, carry out polymerization reaction by suspension polymerization, emulsion polymerization, seed polymerization or dispersion polymerization, etc., to directly prepare resin particles Aqueous dispersio...

Embodiment 1

[0543] [Synthesis of linear polyester]

[0544] In the reaction tank equipped with cooling pipe, stirrer and nitrogen inlet pipe, add 639 parts (24.5 moles) of 1,2-propanediol (hereinafter referred to as propylene glycol), 180 parts (1.6 moles) of bisphenol A 2 Moles of ethylene oxide (EO) adduct, 653 parts (9.8 moles) of dimethyl terephthalate, 10 parts (0.2 moles) of adipic acid, and 3 parts of tetrabutoxytitanic acid as condensation catalyst ester, the reaction was carried out at 180°C for 8 hours in a stream of nitrogen while removing the methanol produced. Then the reaction system was gradually heated up to 230°C, reacted in a nitrogen stream for 4 hours, while removing the produced propylene glycol and water, and further reduced the pressure to 5-20mmHg for the reaction, and the product was taken out when the softening point reached 90°C. The recovered propylene glycol was 263 parts (10.1 moles). After cooling the taken out resin to room temperature, it was pulverized ...

Embodiment 2

[0554] [Synthesis of linear polyester]

[0555] In the same reaction tank as in Example 1, 720 parts (23.8 moles) of propylene glycol, 735 parts (9.8 moles) of dimethyl terephthalate, 29 parts (0.5 moles) of adipic acid, 3 parts of tetrabutoxy base titanate, the reaction conditions are the same as those for synthesizing linear polyester (Aa-1) in Example 1 above, and the product is taken out when the softening point reaches 94°C. The recovered propylene glycol was 235 parts (7.8 moles). After cooling the taken out resin to room temperature, it was pulverized into pellets. The product obtained was a linear polyester (Aa-2).

[0556] The Mn of the linear polyester (Aa-2) is 2700, the Mp is 5800, the content of components with a molecular weight of 500 or less is 2.0%, the THF insoluble part is 0%, En is 73KJ, G' is 300, and Tm is 90 °C, tanδ is 5-11.

[0557] [Synthesis of non-linear polyester]

[0558] In the same reaction tank as in Example 1, 663 parts (22.5 moles) of pr...

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Abstract

Disclosed is a heat-fusible electrostatic image developing toner which has an excellent balance between fixability at low temperatures and grindability and is excellent in glossiness after fixation. Also disclosed is a resin for toners. A polyester resin for toners which is obtained by polycondensing a polyol component and a polycarboxylic acid component is characterized by containing 20-100 weight% of one or more polyester resins (A1) having a storage elastic modulus from 2.5 x 10<3> Pa to 5 x 10<6> Pa at 150 1/2 C wherein the molar average cohesive energy of the polyol component is between 7.0 x 10<4> and 1.4 x 10<5> J.

Description

technical field [0001] The present invention relates to a resin for toner and a toner composition used in electrophotography, electrostatic recording and electrostatic printing. [0002] In addition, the present invention also relates to resin particles. In more detail, the present invention relates to resin particles used for various uses such as: resin for hollow molding, powder coating, electrophotographic toner, electrostatic recording toner, electrostatic printing toner, or hot melt glue. Background technique [0003] The electrostatic image developing toner used in the thermal fixing method is required not to be melted by the hot roller even at a high fixing temperature (hot offset resistance), and to be able to be used even at a low fixing temperature. It is also required to carry out fixing under low temperature (low temperature fixing characteristics), and it is also required that the pulverization of the resin is good when preparing the toner. In general, the lo...

Claims

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Application Information

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IPC IPC(8): G03G9/087
Inventor 小野康弘岩田将和芥川贵司泉刚志滝川唯雄八寻周平
Owner SANYO CHEM IND LTD
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