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Magnetic toner and method for manufacturing magnetic toner

A toner, magnetic technology, applied in the field of magnetic toner manufacturing

Pending Publication Date: 2019-12-20
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes image problems such as "fogging" in which toner with a low charge amount is developed on the non-image area of ​​the photosensitive member, and the laid-on level of toner in the rear end portion of the horizontal line image. ) more "tailing"

Method used

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  • Magnetic toner and method for manufacturing magnetic toner
  • Magnetic toner and method for manufacturing magnetic toner
  • Magnetic toner and method for manufacturing magnetic toner

Examples

Experimental program
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Effect test

specific example

[0197] Specific examples include:

[0198] Such as low molecular weight polyethylene, low molecular weight polypropylene, polyolefin copolymer, polyolefin wax, microcrystalline wax, paraffin wax and Fischer-Tropsch wax and other aliphatic hydrocarbon waxes; such as polyethylene oxide wax and other aliphatic hydrocarbon waxes oxides of these; block copolymers of these; vegetable waxes such as candelilla wax, carnauba wax, Japanese wax, and jojoba wax; animal waxes such as beeswax, lanolin, and spermaceti; waxes such as ozokerite ( ozokerite), ceresin, and petrolatum; waxes mainly composed of aliphatic esters, such as montanate wax and castor wax; and partially or fully deoxygenated aliphatic esters, such as deoxygenated carnauba wax. ester.

[0199] The content of the wax in the toner particles is preferably 1.0% by mass to 30.0% by mass, or more preferably 2.0% by mass to 25.0% by mass.

[0200] The toner particles may also contain a charge control agent to stabilize chargea...

Embodiment

[0357] The present invention will be described in detail below using Examples and Comparative Examples, but the present invention is not limited thereto. Parts in the following recipes are by mass unless otherwise stated.

[0358] Preparation of monomers with carbamate groups

[0359] 50.0 parts of methanol were put into the reactor, and then, 5.0 parts of Karenz MOI [2-isocyanate ethyl methacrylate] (Showa Denko) were added dropwise at 40° C. with stirring. After the dropwise addition was completed, it was stirred for 2 hours while maintaining the temperature at 40°C. Unreacted methanol was then removed in an evaporator, thereby preparing a monomer having a carbamate group.

[0360] Preparation of monomers with urea groups

[0361] 50.0 parts of dibutylamine were put into the reactor, and then, 5.0 parts of KarenzMOI [2-isocyanate ethyl methacrylate] were added dropwise at room temperature with stirring. After the dropwise addition was complete, it was stirred for 2 h...

manufacture example

[0363] The following materials were added to a reactor equipped with a reflux condenser, a stirrer, a thermometer, and a nitrogen introduction tube under a nitrogen atmosphere.

[0364]

[0365] The reactor contents were stirred at 200 rpm, heated to 70° C. and polymerized for 12 hours, thereby obtaining a solution of the polymer of the monomer composition dissolved in toluene.

[0366] Next, the solution was cooled to 25° C., and added to 1,000.0 parts of methanol with stirring to precipitate methanol-insoluble components.

[0367] The resulting methanol-insoluble component was filtered off, washed with methanol, and vacuum-dried at 40° C. for 24 hours, thereby obtaining Polymer A1. Polymer A1 had a weight average molecular weight of 20,100, an acid value of 0.0 mgKOH / g, and a melting point of 62°C.

[0368] NMR analysis of this polymer A1 showed that it contained 28.9 mol % of monomer units derived from behenyl acrylate, 53.8 mol % of monomer units derived from methacryl...

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Abstract

The invention relates to a magnetic toner and a method for manufacturing the magnetic tone. Provided is a magnetic toner having a toner particle containing a binder resin and a magnetic body, whereinthe binder resin contains a polymer A having a first monomer unit and a second monomer unit, the first polymerizable monomer is at least one selected from the group consisting of the (meth)acrylic acid esters having C18-36 alkyl groups, a content of the first monomer unit and a content of the second monomer unit based on the total moles of all monomer units in the polymer A are respectively 5.0 to60.0 mol % and 20.0 to 95.0 mol %, and assuming that an SP value of the first monomer unit and the second monomer unit are taken as SP11 (J / cm3)0.5 and SP21(J / cm3)0.5, respectively, 3.00<=(SP21 SP11)<=25.00 is satisfied, and an oil absorption of the magnetic body is 5 to 40 ml / 100 g.

Description

technical field [0001] The present invention relates to a magnetic toner (hereinafter, sometimes simply referred to as "toner") used in electrophotography, electrostatic recording, magnetic recording, and the like, and a method for producing the magnetic toner. Background technique [0002] In recent years, in an image forming apparatus using an electrophotographic system, demands for energy saving are increasing, and toners having excellent low-temperature fixability are required to reduce the amount of heat used for fixation. [0003] The demand for good image quality also remains high. One method of improving low-temperature fixability is to include a crystalline resin in the toner. The crystalline resin is plasticized at the melting point, is quickly compatible with the binder resin and promotes melt deformation of the toner. [0004] Thus, low-temperature fixability can be greatly improved by including a large amount of crystalline resin. However, crystalline resins ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/0821G03G9/0823G03G9/08711G03G9/08797G03G9/08704G03G9/08713G03G9/08722G03G9/08724G03G9/08731G03G9/08728G03G9/0831G03G9/0833G03G9/0836C08F212/10C08F220/46C08F220/68G03G9/081G03G9/0837G03G9/1075G03G9/1135
Inventor 香川浩辉渡边俊太郎秋山弘贵佐伯达也松井崇
Owner CANON KK
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