Toner composition with broad fusing temperature range and process for preparing the same

A toner, composition technology, applied in the direction of developer, electrography, optics, etc.

Inactive Publication Date: 2012-01-25
EXAX TONER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, research on methods of increasing the maximum melting temperature of toner compositions by utilizing a nonlinear polyester resin having a branched chain structure is still in its infancy

Method used

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  • Toner composition with broad fusing temperature range and process for preparing the same

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0050] Preparation Example 1: Preparation of Linear Polyester Resin

[0051] Polyester resins have a linear molecular structure (currently used as the standard for chemical milling) and allow for cationic dyeing. The polyester resin is polymerized by a melt condensation process.

[0052] 955.6g (4.925mol) dimethyl terephthalate, 955.6g (4.925mol) dimethyl isophthalate, 44.5g (0.15mol) sodium salt of dimethyl 5-sulfoisophthalate and 1520 g (20 mol) of 1,2-propanediol was added to a 10 L glass reactor equipped with a paddle stirrer and a 20 cm fractionating column. 1.4 g of titanium tetraisopropoxide and 5.0 g of IGANOX 1010 (commercially available from Clariant Corporation, East Hanover, N.J.) were used as transesterification catalysts. The reactants were introduced at room temperature and purged with argon for about 1 hour. The mixed reactants were then heated to 150°C and the stirrer was run at 50 rpm to form a homogeneous molten state. In addition, the mixed reactants we...

preparation Embodiment 2

[0054] Preparation Example 2: Preparation of Non-linear Polyester Resin

[0055] In order to manufacture a toner having better melting properties than a toner composition made with a linear resin, a polyester resin composed of a non-linear molecule having a branched chain structure and allowing cationic dyeing is synthesized through a melt condensation process.

[0056] 955.6g (4.925mol) dimethyl terephthalate, 955.6g (4.925mol) dimethyl isophthalate, 44.5g (0.15mol) sodium salt of dimethyl 5-sulfoisophthalate, 42.1 g (0.2 mol) of anhydrous trimellitic chloride and 1520 g (20 mol) of 1,2-propanediol were added to a 10 L glass reactor equipped with a paddle type stirrer and a 20 cm fractionation column. Subsequent steps were carried out in the same manner as in Preparation Example 1 above, to obtain about 2082 g of polyester resin B.

[0057] The polyester resin has a glass transition temperature (Tg) of 71°C. As a result of gel permeation chromatography calibrated by polysty...

preparation Embodiment 3

[0058] Preparation Example 3: Preparation of Non-linear Polyester Resin

[0059] A polyester resin composed of a nonlinear molecule having more branched chain structures than the nonlinear polyester resin in Preparation Example 2 above and allowing cationic dyeing was synthesized by a melt condensation process.

[0060] 955.6g (4.925mol) dimethyl terephthalate, 955.6g (4.925mol) dimethyl isophthalate, 44.5g (0.15mol) sodium salt of dimethyl 5-sulfoisophthalate, 105.3 g (0.5 mol) of anhydrous chlorinated trimellitic anhydride and 1520 g (20 mol) of 1,2-propanediol were added to a 10 L glass reactor equipped with a paddle type stirrer and a 20 cm fractionating column. Subsequent steps were performed in the same manner as in Preparation Example 1 above, to obtain about 2082 g of polyester resin C.

[0061] The polyester resin has a glass transition temperature (Tg) of 68°C. As measured by gel permeation chromatography calibrated by polystyrene standards, the polyester resin had...

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Abstract

The present invention relates to a toner composition with a broad fusing temperature range and a process for preparing the same. The toner composition according to the present invention creates entanglement between adjacent polymer chains using a non-linear polyester resin having a branch structure, provides elasticity to molten materials by the branch structure when the resin is molten, prevents the molten materials from being transferred to the surface of a roller at a high temperature, and thereby increases the maximum fusing temperature. Therefore, as the average branch number per polyester resin increases, the maximum fusing temperature rises and the fusing temperature range of the toner composition can be widened.

Description

technical field [0001] The present invention relates to a toner composition having a wide melting temperature range and a method of producing the toner composition. Background technique [0002] The fusing temperature of the toner refers to a temperature range in which a fusing device is allowed to operate in a printer using the toner. In the widely used heated twin-roll type fusing device, the lowest melting temperature is the temperature at which the toner is completely melted and starts to be only bonded to the paper without adhering to the hot surface of the roller, and the highest melting temperature is the temperature at which the toner melts due to its The temperature at which the viscosity is too low to begin to be transferred to the hot surface of the roll. Generally, when the fusing temperature is wider, the toner can be effectively used in more kinds of laser printers. [0003] Recently, in order to meet the market's increasing demand for toners suitable for hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08
CPCG03G9/08797G03G9/0827G03G9/0819G03G9/08755G03G9/08782G03G9/08795
Inventor 崔俊尹贤男
Owner EXAX TONER
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