Carrier for use in developer developing electrostatic image and developer using the carrier

A developer and electrostatic latent image technology, which is applied to the field of electrostatic image developer carriers, can solve the problems such as the change of the charge amount of the developer, the large amount of failed toners, the pollution of color toners, etc., and achieves good charging stability and difficulty in drawing amount. Changes, less effect of ineffective toner

A developer and electrostatic latent image technology, which is applied to the field of electrostatic image developer carriers, can solve the problems such as the change of the charge amount of the developer, the large amount of failed toners, the pollution of color toners, etc., and achieves good charging stability and difficulty in drawing amount. Changes, less effect of ineffective toner

CN101840171AInactive Publication Date: 2010-09-22RICOH KK
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  • Carrier for use in developer developing electrostatic image and developer using the carrier
  • Carrier for use in developer developing electrostatic image and developer using the carrier
  • Carrier for use in developer developing electrostatic image and developer using the carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0275] Below, examples and comparative examples are enumerated, and the present invention is more specifically described. In the following examples, although various limitations are made to constituent elements, types, combinations, etc., these are merely examples, and the present invention is not limited here. In addition, unless otherwise specified, "parts" herein represent parts by weight.

Synthetic example

[0277] [Synthesis of polyaddition polymer]

[0278] Hereinafter, the present invention will be specifically described using examples.

[0279] The weight-average molecular weight is a value converted to standard polystyrene using a gel purification system. The viscosity is a measured value of JIS-K2283 at 25°C. In addition, the non-volatile content is the weight measured after weighing 1 g of the coating agent composition in an aluminum container and heating at 150° C. for 1 hour, and calculated by the following formula.

[0280] Non-volatile components (%) = weight after heating × 100 / weight before heating

[0281] Synthesis examples of resins used in the present invention are shown below.

Synthetic example 1

[0283] 300 g of toluene was placed in a flask equipped with a stirring device, and the temperature was raised to 90° C. under a nitrogen stream. Next, add to it:

[0284] The chemical formula is CH 2 =CMe-COO-C 3 h 6 -Si(OSiMe 3 ) 3 (In the formula, Me is a methyl group) 84.4 g (200 mmol, manufactured by Thyraplane TM-0701T / CHISSO Corporation) of 3-methacryloyloxypropyl tris(trimethylsilyloxy) silanol represented;

[0285] 3-methacryloyloxypropyltrimethoxysilane 37.2g (150mmol);

[0286] Methyl methacrylate 65.0 g (650 mmol); and

[0287] 2,2'-diazobis-2-methylbutyronitrile 0.58g (3mmol);

[0288] The above mixture was added dropwise over 1 hour. Then add 2,2'-diazobis-2-methylbutyronitrile 0.06g (0.3mmol) solution in toluene 15g (2,2'-diazobis-2-methylbutyronitrile total amount 0.64 g=3.3 mmol), mixed at 90 to 100° C. for 3 hours to carry out radical polymerization to obtain an acrylic addition polymer. The weight average molecular weight of the obtained acrylic add...

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Abstract

The carrier includes a particulate core material having magnetism; and a resin layer located on the surface of the particulate core material. The resin layer is prepared by forming a layer including a copolymer, which includes a unit (A) having a specific acrylic siloxane structure, a unit (B) having a specific acrylic silicone structure having a crosslinking ability, and a unit (C) having a specific acrylic structure in a specific ratio, on the particulate core material, and then subjecting the layer to a heat treatment to crosslink the layer.

Description

technical field [0001] The present invention relates to a carrier for an electrostatic image developer used for a two-component developer used in an electrophotography method and an electrostatic recording method, a developer using the carrier, an image forming method using the developer, an image forming apparatus, and Disposal cartridges. Background technique [0002] In order to develop an electrostatic latent image, a dry developing method used in electrophotography is to electrostatically adhere powder toner that rubs against a triboelectric charge imparting member to the electrostatic latent image to form a visible image. [0003] The dry developing method includes a so-called one-component developing method containing only toner as a main component, and a glass ball, or a magnetic carrier, or a coated carrier whose surface is coated with a resin, etc., mixed with the toner. The so-called two-component development method. [0004] The two-component developer used in ...

Claims

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Application Information

Patent Timeline
22 Sep 2010
Publication
CN101840171A
IPC
G03G9/113; G03G15/00; G03G21/18
CPC
G03G9/1131; G03G9/1133; G03G9/1137; G03G13/16; G03G9/1139; G03G9/1138
Inventors
山口公利; 增田稔