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Method of producing polymerized toner

A technology for toner and mixture, applied in the field of preparing polymerized toner, can solve problems such as low yield, and achieve the effect of inhibiting the formation of latex particles

Active Publication Date: 2012-07-18
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, toner particles prepared by suspension polymerization also have a broad size distribution and are prone to local agglomeration during polymerization
That is, the preparation of toner particles by suspension polymerization involves an additional separation step by centrifugation after polymerization, which results in a low yield

Method used

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  • Method of producing polymerized toner
  • Method of producing polymerized toner

Examples

Experimental program
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Effect test

preparation example Construction

[0042] (1) Preparation of aqueous dispersion

[0043] First, colloidal silica is added to an aqueous medium. Colloidal silica is used in an amount of 5 to 15 parts by weight based on 100 parts by weight of all monomers used. If the amount of colloidal silica used is less than 5 parts by weight, the monomer mixture cannot be dispersed into droplets and becomes unstable during the subsequent homogenization process. Also, the use of colloidal silica in an amount exceeding 15 parts by weight makes the aqueous medium viscous. During the subsequent homogenization, this increased viscosity leads to the formation of droplets of the monomer mixture with a broad size distribution and, as a result, the volume average particle diameter / number average particle diameter ratio (dv / dp) of the final toner Undesirably increases above 1.5. In this case (ie, dv / dp>1.5), the amount of consumed toner increases and an uneven image is obtained during printing. Thereafter, polyvinylpyrrolidone was...

Embodiment 1

[0077] (preparation of polymerized toner)

[0078] At room temperature, 10 parts by weight of colloidal silica (particle diameter=20nm, dv / dp=1.2) as a dispersant was dispersed into 400 parts by weight of ion-exchanged water, and then 2 parts by weight of polyvinylpyrrolidone (molecular weight =30,000) into it. After the mixture was stirred at room temperature for 10 minutes, HCl was added to adjust the pH to 3. The acidic mixture was heated to a reaction temperature of 70° C. and stirred for 20 minutes to prepare an aqueous dispersion.

[0079] 4 parts by weight of allyl methacrylate as a crosslinking agent and 0.02 parts by weight of n-dodecyl mercaptan as a molecular weight regulator were added to 160 parts by weight of styrene as monomers, 36 parts by weight of acrylic acid In a mixture of n-butyl ester and 4 parts by weight of acrylic acid. 1 part by weight of a sulfonic acid group-containing styrene-acrylic polymer as a charge control agent was sufficiently dissolved ...

Embodiment 2

[0092] A polymerized toner was prepared in the same manner as in Example 1 except that polyvinylpyrrolidone having a molecular weight of 40,000 was added. The results are shown in Table 1.

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Abstract

Disclosed is a method for producing a polymerized toner. In the method, a mixture of colloidal silica as an aqueous dispersant and a polyvinylpyrrolidone is used during suspension polymerization. The amount of polyvinylpyrrolidone / colloidal silica aggregates having a diameter smaller than 100 nm is also limited to 1% by weight or less, based on the total weight of all aggregates. A polymerized toner produced by the method has a volume average particle diameter (dv) of 5 to 10 [mu]m and a volume average particle diameter / number average particle diameter ratio (dv / dp) of 1.5 or less. The polymerized toner is consumed in a small amount during printing. According to the method, the formation of emulsion particles having a size smaller than 0.5 [mu]m is inhibited.

Description

technical field [0001] The present invention relates to a method for preparing a polymerized toner, and more particularly, the present invention relates to a method for preparing a polymerized toner using an aggregate of polyvinylpyrrolidone and colloidal silica in an aqueous medium as a dispersant agent method. Background technique [0002] Toners are used in the development of electrophotographic images and are used in a variety of electrostatic printers and copiers. Toner refers to a coating substance that is capable of being transferred and fixed to a target to form the desired pattern thereon. As computer-aided documentation has become popular in recent years, demand for image forming devices such as printers has rapidly increased. Along with these demands, toner usage is also on the rise. [0003] Methods of producing toners are mainly classified into two types, namely, methods based on pulverization and polymerization. The first type of comminution-based methods i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/08
CPCG03G9/0806G03G9/0819G03G9/08711G03G9/08755G03G9/09392
Inventor 张旭李昶淳郑宇哲李志勋
Owner LG CHEM LTD
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