Toner binder and toner

A technology of toner and adhesive, applied in the direction of developer, instrument, electrography, etc., can solve the problems of insufficiency, etc., and achieve the effect of excellent caking resistance and low temperature fixability

Active Publication Date: 2011-02-23
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to obtain good blocking resistance while maintaining low-temperature fixing, it is not sufficient to rely on the above techniques.

Method used

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  • Toner binder and toner
  • Toner binder and toner
  • Toner binder and toner

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0177] Production example 1 (production of crystalline part b)

[0178] Into the reaction tank with cooling pipe, mixer and nitrogen inlet pipe, add 159 parts of sebacic acid, 28 parts of adipic acid and 124 parts of 1,4-butanediol and dihydroxybis(triethanolamine) as a condensation catalyst One part of titanium was reacted at 180°C for 8 hours in a nitrogen stream while distilling off generated water. Next, while slowly raising the temperature to 220° C., the generated water and 1,4-butanediol were distilled off in a nitrogen stream, and reacted for 4 hours, and then reacted under a reduced pressure of 5 to 20 mmHg. When the Mw reached 10,000, the its taken out. After cooling the taken-out resin to room temperature, it was pulverized into particles to obtain a crystalline polycondensation polyester resin [crystalline fraction b1]. [Crystalline fraction b1] had a melting point of 55° C., a Mw of 10,000, and a hydroxyl value of 36.

manufacture example 2

[0179] Production example 2 (production of crystalline part b)

[0180] In the reaction tank with cooling pipe, stirrer and nitrogen inlet pipe, add 286 parts of dodecanedioic acid and 159 parts of 1,6-hexanediol and 1 part of dihydroxy bis(triethanolamine) titanium as condensation catalyst, The reaction was carried out at 170°C for 8 hours in a nitrogen stream while distilling off generated water. Next, while slowly raising the temperature to 220° C., the generated water was distilled off in a nitrogen stream, and the reaction was carried out for 4 hours, and the reaction was further carried out under a reduced pressure of 5 to 20 mmHg, and it was taken out when the Mw reached 10,000. After cooling the taken-out resin to room temperature, it was pulverized into particles to obtain a crystalline polycondensation polyester resin [crystalline fraction b2]. [Crystalline fraction b2] had a melting point of 65° C., a Mw of 10,000, and a hydroxyl value of 36.

manufacture example 3

[0181] Production example 3 (production of crystalline part b)

[0182] Into a reaction container equipped with a stirring bar and a thermometer, 66 parts of 1,4-butanediol, 86 parts of 1,6-hexanediol, and 40 parts of methyl ethyl ketone (hereinafter referred to as MEK) were added. 248 parts of hexamethylene diisocyanate (HDI) was added to this solution, and it was made to react at 80 degreeC for 5 hours, and the MEK solution of the crystalline polyurethane resin [crystalline part b3] was obtained. [Crystalline fraction b3] after removing the solvent had a melting point of 57° C., a Mw of 9700, and a hydroxyl value of 36.

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Abstract

Provided are: a toner excellent in low-temperature fixability and nonblocking properties; and a toner binder. The toner binder contains a crystalline resin (A) which has a maximum-peak temperature for heat of fusion (Ta) of 40-100 DEG C, a ratio of the softening temperature to the Ta, (softening temperature) / Ta, of 0.8-1.55, and a melting-initiation temperature (X) in the temperature range of (Ta+-30) DEG C and which satisfies the following requirements. The toner comprises the toner binder and a colorant. [Requirement 1] G'(Ta+20) = 50 to 1x106 [Pa] [Requirement 2] |logG''(X+20)-logG''(X)|>2.0 [G', storage modulus [Pa], G''; loss modulus [Pa]].

Description

technical field [0001] The present invention relates to a toner binder and a toner using the binder. Background technique [0002] It has been desired to develop a technology for fixing toner with lower energy than before. Therefore, toners for electrostatic charge development capable of fixing at lower temperatures are strongly demanded. [0003] As a method of lowering the fixing temperature of the toner, a technique of lowering the glass transition temperature of the toner binder is generally performed. However, if the glass transition temperature is lowered too low, aggregation (caking) of the powder is likely to occur, and since the preservability of the toner on the surface of the fixed image is deteriorated, in practice, 50° C. lower limit. This glass transition temperature is a design point of the toner binder, and in the method of lowering the glass transition temperature, toner capable of fixing at a lower temperature than conventional ones has not been obtained...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087C08G81/00
CPCG03G9/08702G03G9/08797G03G9/08788G03G9/0821G03G9/08766G03G9/08759G03G9/08795G03G9/08764
Inventor 太田浩二江尻章伍
Owner SANYO CHEM IND LTD
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