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Toner and Toner Binder

a technology of toner and binder, which is applied in the field of toner, can solve the problems of poor anti-blocking properties of toners, and achieve the effects of good anti-blocking properties, good low-temperature fixing ability, and good resin properties

Inactive Publication Date: 2009-12-10
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The toner of the present invention comprising the toner binder of the present invention comprising a condensation-polymerization polyester resin is excellent in anti-blocking property at high temperature and high humidity and is of good low-temperature fixing ability. Further, a toner with good resin properties can be obtained without use of organic tin, which will cause environmental problems, as a catalyst.

Problems solved by technology

In such cases, however, there is a problem that toners are somewhat poor in anti-blocking property at high temperature and high humidity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Synthesis of Catalyst (a)

[0119]A reaction vessel equipped with a condenser, a stirrer and a nitrogen inlet tube capable of bubbling liquid phase was charged with 126 parts of ethyl acetate and 200 parts of terephthalic acid. While bubbling liquid phase with nitrogen, the temperature was raised slowly to 60° C. While 1617 parts of titanium tetraisopropoxide was dropped, a reaction was carried out at 60° C. for 4 hours. Thus, a reaction mixture in the form of slurry was obtained. The reaction mixture was separated through a filter paper and dried at 40° C. / 20 kPa·s. Thus, a mixture (a-1) of titanium triisopropoxyterephthalate and unreacted terephthalic acid (content of titanium triisopropoxyterephthalate: 65%) was obtained. The solubility of (a-1) in water was 0.6 g / 100 ml and the solubility in water of titanium triisopropoxyterephthalate obtained by further refining was 0.9 g / 100 ml.

[Linear Polyester Resin Synthesis]

[0120]A reaction vessel equipped with a condenser, a stirrer and a n...

example 2

Modified Polyester Resin Synthesis

[0141]A reaction vessel equipped with a condenser, a stirrer and a nitrogen inlet tube was charged with 532 parts of bisphenol A-PO (2 moles) adduct, 40 parts of bisphenol A-PO (3 moles) adduct, 133 parts of bisphenol A-EO (2 moles) adduct, 10 parts of phenol novolak (average degree of polymerization: about 5)-EO (5 moles) adduct, 252 parts of terephthalic acid, 19 parts of isophthalic acid, 10 parts of trimellitic anhydride, and 3.08 parts of (a-1) as a polycondensation catalyst, and a reaction was carried out under a nitrogen stream at 230° C. for 10 hours while distilling off the byproduct water. Then, the reaction was further allowed to proceed under reduced pressure (5 to 20 mm Hg) until the acid value reached not more than 2. Then, the temperature was adjusted to 208° C. and 50 parts of trimellitic anhydride was added. A reaction was allowed to proceed at ordinary pressure for 1 hour and then under reduced pressure (20 to 40 mm Hg) and when th...

example 3

Synthesis of Catalyst (a)

[0143]A reaction vessel equipped with a condenser, a stirrer and a nitrogen inlet tube capable of bubbling liquid phase was charged with 520 parts of ethyl acetate and 340 parts of isophthalic acid. While bubbling liquid phase with nitrogen, the temperature was raised slowly to 60° C. While 284 parts of titanium tetraisopropoxide was dropped, a reaction was carried out at 60° C. for 5 hours. Thus, a reaction mixture in the form of slurry was obtained.

[0144]The reaction mixture was separated through a filter paper and dried at 40° C. / 20 kPa·s. Thus, a mixture of titanium diisopropoxydiisophthalate and unreacted isophthalic acid (a-2; content of titanium diisopropoxydiisophthalate: 95%) was obtained. The solubility of (a-2) in water was 0.3 g / 100 ml and the solubility in water of titanium diisopropoxydiisophthalate obtained by further refining was also 0.3 g / 100 ml.

[Modified Polyester Resin Synthesis]

[0145]A modified polyester resin (AY1-2) was produced by car...

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Abstract

A polyester resin toner binder which gives a toner with good anti-blocking property at high temperature and high humidity and good low-temperature fixing ability. The present invention is directed to a toner binder for developing electrostatic charge images, which binder comprises a condensation-polymerization polyester resin, the polyester resin being a product formed in the presence of a catalyst (a) represented by the following general formula (I):Ti(—X)m(—OR)n  (I)wherein R is H or a hydrocarbon group having from 1 to 24 carbon atoms which may contain from 1 to 3 ether bonds and / or from 1 to 2 hydroxyl groups; X is a residue formed by removing H of one carboxyl group from an aromatic mono- or polycarboxylic acid, provided that in the case of a polycarboxylic acid, a carboxyl group other than said one carboxyl group may intra molecularly polycondense with an OR group in the same molecule to form a ring structure or may form a structure where it has polycondensed intermolecularly with an OR group in another molecule; m=1 to 3, n=1 to 3, and the sum of m and n is 4.

Description

TECHNICAL FIELD[0001]The present invention relates to a toner binder comprising polyester resin which is useful for dry toners to be used for the development of electrostatic images or magnetic latent images in the electrophotographic process, electrostatic recording process, electrostatic printing process, etc., and a toner using the toner binder.BACKGROUND ART[0002]Use of a polyester resin as a binder for improving the low-temperature fixing ability of a toner is known (see, for example, patent documents 1, 2). Reduction in molecular weight or glass transition temperature (henceforth, abbreviated as Tg) is needed in order to further improve the low-temperature fixing ability of a toner. In such cases, however, there is a problem that toners are somewhat poor in anti-blocking property at high temperature and high humidity.[0003]Patent document 1: JP 62-178278 A[0004]Patent document 2: JP 4-313760 ADISCLOSURE OF THE INVENTIONProblem to Be Solved by the Invention[0005]An object of th...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03G9/087C08G63/02
CPCC08G63/85G03G9/0806G03G9/097G03G9/08755G03G9/08764G03G9/08753
Inventor ONO, TAKASHISAKURAI, YOKO
Owner SANYO CHEM IND LTD
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