Polymerized toner with high chargeability and good charge stability and preparatiion method thereof

A technology of toner and charge control agent, which is applied in the field of preparing the polymerized toner, can solve the problems of lower charge rate and charge stability, deterioration of charge rate of toner, reduction of charge rate, etc.

Inactive Publication Date: 2007-04-04
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, as disclosed in the above-mentioned documents, if the polymer is used as a charge control agent, the pigment is aggregated on the surface of the toner during polymerization due to its surface activity, thereby deteriorating the chargeability of the toner. become worse
In addition, because the polymeric charge control agent is adsorbed on the surface of the pigment due to the larger surface area of ​​the pigment, the amount of charge control agent that actually controls the charge is reduced, thereby reducing the chargeability and charge stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] (1) Preparation of polymerized toner

[0037] An aqueous dispersion solution is prepared by dissolving a dispersant in an aqueous solution. Based on 100 parts by weight of the total amount of resin monomers for binders, the dispersant can be 0.1 to 20 parts by weight of at least one selected from the group consisting of inorganic dispersants, water-soluble organic polymer dispersants and anionic surfactants. Dispersants in the group.

[0038] Examples of inorganic dispersants include insoluble calcium salts, insoluble magnesium salts, hydrophilic silica, hydrophobic silica, colloidal silica, and the like. Examples of water-soluble organic polymers are polyoxyethylene alkyl ethers, polyoxyalkylene alkylphenol ethers, sorbitan fatty acid esters, polyoxyalkylene fatty acid esters, fatty acid glycerides, polyvinyl alcohol, alkyl fibers Nonionic polymers such as polyvinylpyrrolidone, polyvinylpyrrolidone; and polyacrylamide, polyvinylamine, polyvinylamine N-oxide (polyviny...

Embodiment 1

[0051] 1-1: Preparation of toner suspension

[0052] 400 g of distilled water and 10 g of colloidal silica as a dispersant were dissolved in a 500 ml reactor and heated to a reaction temperature of 70° C. to prepare a dispersed aqueous solution.

[0053] 160 g of styrene as a monomer, 36 g of butyl acrylate and 4 g of acrylic acid, 4 g of allyl methacrylate as a crosslinking agent, and 0.02 g of n-dodecyl mercaptan as a chain transfer agent were mixed. Then, 2.3 g of a styrene-acryloyl-based charge control agent containing a sulfonate group and 3.5 g of a styrene-butadiene-styrene symmetrical block copolymer as a pigment stabilizer were fully dissolved in the mixture obtained above Among them, the weight-average molecular weight of the charge control agent is 10,000g / mol, the glass transition temperature is 59°C and the acid value is 21mgKOH / g, the content of styrene in the pigment stabilizer is 30wt%, and the weight-average molecular weight is 70,000 g / mol. 10 g of carbon b...

Embodiment 2～5

[0060] Examples 2 to 5: Toner for adjusting pigment stabilizer

[0061] Basically the same as in Example 1, except that the block ratio (styrene wt %) of the styrene-butadiene-styrene block copolymer used as a pigment stabilizer was changed as shown in Table 1 below. The polymerization reaction is carried out and the silica used as a dispersant is removed from the surface of the toner particles. Agglomerates were removed with a No. 150 sieve, dried and their amount measured. The amount of agglomerates is about 1 to 2% by weight based on the amount of toner.

[0062] From the obtained silica-removed product, a toner mud cake, a toner powder, and a finished product were prepared by substantially the same method as in Example 1. The size of the produced toner particles is in the range of 6.8 μm to 7.5 μm. The prepared toner was subjected to a printing test, and its image density was measured. The results are shown in Table 1 below.

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Abstract

The present invention relates to a polymerized toner with high chargeability and good charge-stability, and a method of preparing the polymerized toner. In particular, the present invention relates to a polymerized toner containing pigments, pigment stabilizers, charge control agents and binder resin monomers, and a method to prepare the polymerized toner by suspension polymerization of pigments, pigment stabilizers, charge control agents and binder resin monomers, wherein the pigment stabilizer is a styrene-butadiene-styrene block copolymer having the weight-average molecular weight of 2,000 to 200,000, and the charge control agent is a copolymer with sulfonate group having the weight-average molecular weight of 2,000 to 200,000.

Description

[0001] related application [0002] This application claims priority from Korean Patent Application No. 10-2005-0019027 filed on Mar. 8, 2005, which is hereby incorporated by reference for all purposes set forth fully herein. technical field [0003] The present invention relates to a polymerized toner having a high chargeability and good charge stability, and a method for preparing the polymerized toner. Specifically, the present invention relates to a polymerized toner comprising a pigment, a pigment stabilizer, a charge control agent, and a resin monomer for a binder, and the pigment, a pigment stabilizer, a charge control agent, and a resin for a binder A method for preparing the polymerized toner by suspension polymerization of monomers, wherein the pigment stabilizer is a styrene-butadiene-styrene block copolymer having a weight average molecular weight of 2,000 to 200,000, and the charge control agent is a weight average molecular weight 2,000-200,000 copolymers contai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/097G03G9/08C08F292/00C08F2/18
CPCG03G9/09392G03G9/09364C08L53/02G03G9/09321G03G9/09385G03G9/08708C08F292/00G03G9/08711G03G9/09342G03G9/09335G03G9/08742G03G9/08791C08L51/003C08F291/00C08F257/02C08F265/04G03G9/09378G03G9/09733C08F279/02G03G9/08788G03G9/08737C08L2666/02C08L2666/04G03G9/0806G03G9/08728G03G9/08795
Inventor 李雄基李昶淳尹泰熙郑宇哲
Owner LG CHEM LTD
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