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Toner compositions comprising crystalline polyester and wax

A technology of crystalline polyester and crystalline polyester resin, applied in the field of toner, which can solve the problems of high dispersibility, high dielectric loss, poor transfer efficiency of printers, low electric charge, etc.

Active Publication Date: 2017-12-29
XEROX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This poor dispersion leads to high dielectric loss, which in turn leads to poor transfer efficiency of the printer and, in some cases, lower charge

Method used

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  • Toner compositions comprising crystalline polyester and wax
  • Toner compositions comprising crystalline polyester and wax
  • Toner compositions comprising crystalline polyester and wax

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0122] This example describes an exemplary toner with Regal 330 pigment dispersion and with 35 controls.

[0123] A polyester toner (toner B) was prepared on a 1-L laboratory scale in which the usual 35 carbon black was replaced with 6% Regal 330. use 35 A similar control (Toner A) was prepared. Both toner formulations also included 0.6% P15:3 cyan pigment. Regal 330 pigment is a standard production dispersion of 140 nm size prepared with 7.1 pph TaycaPower B2060 (based on active surfactant and pigment on a dry weight basis). with a dielectric loss of 27 The dielectric loss was measured at 105 compared to a control of 35 (note that all dielectric loss values ​​are multiplied by 1000X for convenience). In addition, the charge in both regions is higher for Regal 330 than for 35 is much lower. This experiment shows that with purified carbon black such as A toner of 35 is good for good dielectric loss. Because, as described herein, mixed toners exhibit even higher ...

example 2

[0128] Pigment Dispersion

[0129] In mixed toners, use NIPEX 35 pigment dispersion prepared from 7.2pph TaycaPower (TaycaPower is 60% active ingredient solids / 40% water based on % solids of dispersant and pigment), or 2pph TaycaPowder and 3.2pph Demol SN-B prepared as a mixture of both (all based on % solids of dispersant and pigment, where TaycaPower is 60% active ingredient solids / 40% water) 35 dispersions.

[0130] For the TaycaPower BN2060 / DemolSN-B dispersion with 2pph TaycaPower and 3.2pph Demol SN-B, a total of 114Og of dispersion was prepared in a Rannie 2000 homogenizer at 20.83% solids. The final particle size was 150 nm and was very stable with no settling overnight. The homogenizer runs were 0.5 hours at a low pressure of 2000 psi and 3.5 hours at a high pressure of 20,000 psi as a pre-homogenization step.

example 3

[0132] latex preparation

[0133] A styrene, n-butyl acrylate, β-CEA A 1-L scale latex emulsion was prepared as follows, consisting of 81.5% styrene, 18.5% n-butyl acrylate, 1.50 pph β-carboxyethyl acrylate (β-CEA) and 0.35 pph Latex A composed of polymer particles generated by emulsion polymerization of decanediol diacrylate (ADOD):

[0134] Prepare 1.17 g by mixing in a stainless steel holding tank for 10 minutes A surfactant solution of DB-45 (anionic emulsifier; sodium dodecyl diphenyloxydisulfonate, 45 percent active, available from Pilot Chemical Company) and 306.6 grams of deionized water. The holding tank was then purged with nitrogen for 5 minutes before being transferred into the reactor. The reactor was then continuously purged with nitrogen while stirring at 370 rpm. The reactor was then heated at a controlled rate up to 80°C and held there. Separately, 5.25 grams of ammonium persulfate initiator was dissolved in 48.9 grams of deionized water.

[0135] Sepa...

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Abstract

A hybrid toner includes a core having at least one amorphous polyester resin and at least one crystalline polyester resin, and at least one styrene / acrylate resin, a shell comprising at least one styrene / acrylate resin, at least one wax, and optionally a pigment dispersion, the first modulated differential calorimetry scan of the hybrid toner shows at least two melting point peaks below about 80 DEG C, and the difference between the two melting point peaks is less than or equal to about 15 DEG C.

Description

Background technique [0001] This disclosure relates to toners. In particular, the present disclosure relates to toner compositions comprising crystalline polyesters and waxes selected to exhibit an improved broad fusing latitude. [0002] Hybrid toners typically employ some combination of amorphous polyester latex, crystalline polyester latex, and styrene / acrylate polymer latex. They also typically contain a shell of styrene / acrylate polymer latex. The introduction of styrene / acrylates into otherwise polyester-based toner compositions acts to reduce overall toner cost. However, it has been observed that the fusing range may be insufficient, where the fusing step produces image mottling and low thermal offset temperatures, especially at lower wax loadings. The present disclosure addresses this fusing range problem by providing combinations of crystalline polyesters and waxes that perform better during fusing. Also, in these hybrid toners, carbon black cannot be dispersed we...

Claims

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Application Information

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IPC IPC(8): G03G9/087
CPCG03G9/08728G03G9/08755G03G9/08782G03G9/09364G03G9/09321G03G9/09371G03G9/0821
Inventor R·P·N·维根V·M·法鲁希亚F·P-H·李M·J·迪阿马托M·S·霍金斯E·G·兹瓦茨王雨淋A·谢赫-卡西姆S·J·加德纳
Owner XEROX CORP
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