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Manufacture for thermoplastic resin granular water dispersion and toner for electronic photography

A technology of thermoplastic resin and water-based dispersion, applied in the direction of developer, electrography, instrument, etc., can solve the problems of unrecorded and implied, and achieve the effect of less residual solvent and easy removal

Inactive Publication Date: 2003-09-03
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In these patent documents, as water-soluble organic compounds having a boiling point of 60 to 200°C, organic solvents having a boiling point of 100°C or higher that dissolve the above-mentioned polyester resin, and organic solvents having a boiling point of less than 100°C that do not dissolve the above-mentioned polyester resin are also exemplified. However, there is no description or suggestion about removing the organic solvent from the obtained aqueous dispersion and using the above-mentioned polyester resin in combination with an organic solvent that does not dissolve the polyester resin. In the examples, all used Contains an organic solvent that dissolves the above-mentioned polyester resin and has an organic solvent (good solvent) with a boiling point of 100°C or higher. After producing an aqueous dispersion, it is used in a coating agent, etc. without removing the organic solvent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0144] Hereinafter, the present invention will be specifically described with reference to synthesis examples, examples, and comparative examples. The parts and % in the examples are based on weight unless otherwise specified.

Synthetic example 1

[0145] Synthesis Example 1 [Synthesis of Carboxyl Group-Containing Polyester Resin (I)]

[0146] Put 192 parts of ethylene glycol, 324 parts of neopentyl glycol, 996 parts of terephthalic acid and 1.0 part of tetrabutyl titanate into a 2-liter four-neck flask made of glass with a rectification tower and a condenser, The temperature was raised slowly under flow, and the reaction was carried out at 240° C. for 8 hours. Accompanied by the reaction, analyze the condensed water distilled out, measure the amount of ethylene glycol and neopentyl glycol simultaneously, and react while filling up to obtain a polyester resin (I -1). The glass transition temperature (Tg) of the polyester resin (I-1) measured by differential calorimetry (DSC), the softening point measured by the ring and ball method, and the temperature dropped by 1 / 2 measured by the flow rate tester (Tg) 1 / 2 ), gel composition, Mw, Mn, Mw / Mn and acid value are shown in Table 3.

[0147] Synthesis example 2~synthesis e...

Synthetic example 6

[0149] Synthesis Example 6 [Synthesis of Carboxyl Group-Containing Polyester Resin (II)]

[0150] In a four-neck glass flask, 224 parts of ethylene glycol, 250 parts of neopentyl glycol, 996 parts of terephthalic acid, and 17 parts of Epicron 830 [manufactured by Dainippon Ink Chemicals Co., Ltd., bisphenol F type 2 Functional group epoxy resin], 30 parts of カ-ジュラ E10 (manufactured by Shell Japan, glycidyl neodecanoate) and 1.0 part of dibutyltin oxide were slowly heated up under nitrogen flow, and reacted at 245°C for 18 hours. As the reaction progressed, the distilled condensation water was analyzed, and the amounts of ethylene glycol and neopentyl glycol were measured simultaneously, and the reaction was carried out while filling. A polyester resin (II-1) having an acid value of 9 and being solid at normal temperature was obtained. The glass transition temperature (Tg) of the polyester resin (II-1) was measured by differential calorimetry (DSC), the softening point measure...

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PUM

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Abstract

The present invention provides a method for producing an aqueous dispersion of thermoplastic resin microparticles containing considerably less residual solvent remaining in resin particles, and a toner for electrophotography containing considerably less residual solvent. A self-water-dispersible thermoplastic resin is swollen using an organic solvent having a boiling point lower than 100 DEG C, which does not dissolve but can swell the self-water-dispersible thermoplastic resin, to produce a swollen material and the resulting swollen material is dispersed into an aqueous medium in the form of microparticles to produce an initial aqueous dispersion, and then the organic solvent is removed from the initial aqueous dispersion to prepare a dispersion. A toner for electrophotography contains microparticles obtained by separating microparticles of the self-water-dispersible thermoplastic resin from the aqueous dispersion of thermoplastic resin microparticles and drying the microparticles.

Description

technical field [0001] The present invention relates to a method for producing an aqueous dispersion of thermoplastic resin particles used in printing materials such as toners and inks for electrophotography, paints, adhesives, binding materials, fiber processing, papermaking, paper processing, and civil engineering. And a toner for electrophotography containing thermoplastic resin fine particles obtained by the production method. Background technique [0002] As methods for producing thermoplastic resin fine particle aqueous dispersions, there are roughly two types of polymerization granulation method in which emulsion particles are formed from polymerized monomers during polymerization, and dispersion granulation method in which resin is formed into fine particles. [0003] Regarding the former polymerization granulation method, based on emulsion polymerization technology and suspension polymerization technology, according to the required particle diameter, the seed crysta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/05G03G9/087
CPCC08J3/05G03G9/08755
Inventor 真造谨尔寺田浩之渡边英树
Owner DAINIPPON INK & CHEM INC