Supercharge Your Innovation With Domain-Expert AI Agents!

Toner binder and process for producing same

A technology of adhesives and toners, applied in the directions of developers, instruments, electrography, etc., which can solve the problems of low temperature color fixation and thermal offset resistance

Inactive Publication Date: 2008-09-10
SANYO CHEM IND LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reducing the difference between the softening points of the two polyesters for powder mixing can improve the dispersibility of the pigment, but this cannot achieve the fundamental purpose of mixing the two polyesters to improve low-temperature color fixation and heat offset resistance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment -1

[0171] [synthesis of polyester (A)]

[0172] 719 parts of the adduct of 2 mol ethylene oxide and bisphenol A, 352 parts of terephthalic acid and 3 parts of dibutyltin oxide as a condensation catalyst were placed in a reaction vessel equipped with a cooling tube, a stirrer and a nitrogen line , dehydration reaction was carried out at 230° C. for 10 hours in a nitrogen stream. Then the semi-finished product is reacted under a negative pressure of 5-20 mmHg, taken out when the softening point is 128° C., cooled to room temperature, and pulverized to obtain polyester (A1) particles.

[0173] Polyester (A1) does not contain THF-insoluble components, and is basically linear, with an acid value of 1, a hydroxyl value of 6, a Tg of 71°C, a number average molecular weight of 7800, and a weight average molecular weight of 30000.

[0174] [synthesis of polyester (B)]

[0175] 725 parts of the adduct of 2mol ethylene oxide and bisphenol A, 284 parts of terephthalic acid and 3 parts of d...

Embodiment -2

[0185] [synthesis of polyester (B)]

[0186]371 parts of adducts of 2mol ethylene oxide and bisphenol A, 395 parts of adducts of 2mol propylene oxide and bisphenol A, 175 parts of terephthalic acid, 87 parts of fumaric acid, 20 parts of terephthalic acid Phenol and 3 parts of dibutyltin oxide as a condensation catalyst were put into a reaction vessel equipped with a cooling tube, a stirrer and a nitrogen conduit, and dehydration reaction was carried out in a nitrogen flow at 200° C. for 10 hours. Then the semi-finished product was reacted at 180° C. under a negative pressure of 100 mmHg. When the acid value reached 8, 32 parts of trimellitic anhydride was added, sealed and reacted under normal pressure for 1 hour, then the semi-finished product was taken out, cooled to room temperature, and pulverized to obtain polyester (B2) particles.

[0187] Polyester (B2) does not contain THF-insoluble components, and is basically linear, with a softening point of 85°C, an acid value of 2...

Embodiment -3

[0192] [synthesis of polyester (A)]

[0193] 130 parts of adducts of 2mol ethylene oxide and bisphenol A, 553 parts of adducts of 2mol propylene oxide and bisphenol A, 192 parts of terephthalic acid, 155 parts of dodecenyl succinic anhydride, 37 parts 3 parts of trimellitic anhydride and 3 parts of dibutyltin oxide as a condensation catalyst were put into a reaction vessel equipped with a cooling tube, a stirrer and a nitrogen conduit, and dehydration reaction was carried out at 210°C for 10 hours in a nitrogen stream. Next, the semi-finished product is reacted under a negative pressure of 5-20100 mmHg, taken out when the softening point reaches 122° C., cooled to room temperature, and pulverized to obtain polyester (A3) particles.

[0194] The polyester (A3) contained no THF-insoluble components, had an acid value of 10, a hydroxyl value of 14, a Tg of 65°C, a number average molecular weight of 6400, and a weight average molecular weight of 73000.

[0195] [synthesis of poly...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
glass transition temperatureaaaaaaaaaa
softening pointaaaaaaaaaa
hydroxyl valueaaaaaaaaaa
Login to View More

Abstract

A toner binder for dry toners which comprises a polyester; and a process for producing the toner binder. A known conventional technique for imparting low-temperature fixability and high-temperature non-offset properties to a toner binder is to use a mixture of two powdery polyesters. However, when the two polyesters mixed differ greatly in softening point, the effect of mixing is not obtained and pigments show poor dispersiblity during toner production. The toner binder and the process eliminate these problems. The toner binder comprises aggregates of binder resin particles comprising two polyesters (A) and (B), wherein the polyester (A) has a higher softening point than the polyester (B) and the polyesters (A) and (B) have been evenly mixed in each particle. The process for producing a toner binder is characterized by melt-mixing the two polyesters (A) and (B) at 80 to 180 DEG C. The toner binder is used mainly as an ingredient for dry toners.

Description

technical field [0001] The present invention relates to a toner binder for dry toner used in electrophotography, electrostatic recording, electrostatic printing, etc. and a method for producing such a binder. Background technique [0002] Toner binders for dry toners need to satisfy conflicting properties that such toners can be fixed even at low heat roller temperatures (low temperature fixability), It does not melt to the hot roller even when it is high (that is, resistance to heat offset (offset)). [0003] Conventionally, styrene-acrylic resins, polyesters, epoxy resins, etc. are commonly used for toner binders. Cross-linked polyesters are used more frequently due to their good low-temperature color fixing properties. [0004] In recent years, from the point of view of energy saving, toner binders and toners made from them are required to have better low-temperature color fixability, and from the perspective of reducing the size of equipment such as copiers, toner bind...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/087C08G63/127
CPCG03G9/08797G03G9/08793G03G9/08755
Inventor 中西秀男加藤智久岩田将和
Owner SANYO CHEM IND LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com