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Toner
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A technology of toner and external additives, which is applied in the field of toner and can solve problems such as reduced fluidity
Pending Publication Date: 2021-12-28
CANON KK
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Problems solved by technology
[0007] Therefore, it is impossible to completely solve problems such as image streaks because the fluidity decreases due to long-term use
Method used
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example
[0151] The following are examples: eg, homopolymers of aromatic vinyl compounds such as styrene and vinyltoluene, and their substituents; eg, styrene-propylene copolymers, styrene-vinyltoluene copolymers, styrene-vinyl Naphthalene copolymer, styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-butyl acrylate copolymer, styrene-octyl acrylate copolymer, styrene-dimethylaminoethyl acrylate Copolymer, Styrene-Methyl Methacrylate Copolymer, Styrene-Ethyl Methacrylate Copolymer, Styrene-Butyl Methacrylate Copolymer, Styrene-Dimethylaminoethyl Methacrylate Copolymer , Styrene-vinyl methyl ether copolymer, Styrene-vinyl ethyl ether copolymer, Styrene-vinyl methyl ketone copolymer, Styrene-butadiene copolymer, Styrene-isoprene Copolymers of aromatic vinyl compounds such as copolymers, styrene-maleic acid copolymers, and styrene-maleic acid ester copolymers; for example, homopolymerization of aliphatic vinyl compounds such as ethylene and propylene and their sub...
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[0391] The present invention is described more specifically below using Production Examples and Examples, but the present invention is by no means limited to or by these. Unless specifically stated otherwise, "parts" and "%" given in Examples and Comparative Examples are based on mass in all cases.
[0392] Synthesis of polyester resin (A-1)
[0393] Polyester resin (A-1) was synthesized using the following procedure.
[0394] The following materials were introduced into an autoclave equipped with a decompression device, a water separation device, a nitrogen introduction device, a temperature measurement device, and a stirring device, and a reaction was carried out at 200° C. for 5 hours under a nitrogen atmosphere under normal pressure.
[0395] Propylene oxide 2.0mol adduct of bisphenol A: 77.4 parts
[0396] · Terephthalic acid: 15.8 parts
[0397] · Isophthalic acid: 15.8 parts
[0398] ·Maleic acid: no
[0399] Tetrabutoxy titanate: 0.2 parts
[0400] After this t...
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Abstract
The invention relates to a toner. The toner includes a toner particle containing a resin A represented by the following formula (1) shown in the specification, wherein the resin A is present on a surface of the toner particle; and an external additive A being a fine particle containing silicon, wherein an average value of a shape factor SF-1 of the external additive A is 105 to 120, and the average value of the shape factor SF-2 of the external additive A is 100 to 130.
Description
technical field [0001] The present disclosure relates to a toner used in a recording method employing electrophotography and the like. Background technique [0002] In recent years, since the usage purposes and usage environments of image forming apparatuses such as copiers and printers have become diversified, longer life and higher image quality are required. [0003] Various methods are known as image forming methods, but among them, electrophotography is the main technique. The process performed in the electrophotography method is as follows. First, an electrostatic latent image is formed on an electrostatic charge image bearing member (hereinafter also referred to as "photosensitive member") using various means. Next, the latent image is converted into a visible image by developing with a developer (hereinafter also referred to as "toner"), and if necessary, the toner image is transferred to a recording medium such as paper, and the or pressure to fix the toner image...
Claims
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