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Microencapsulated material, microencapsulated color material, process for production of the material, ink composition, ink-jet recording method, and recorded material

A manufacturing method and microencapsulation technology are applied in the fields of microcapsules, microencapsulated color materials, their manufacture, ink compositions, ink jet recording and recorded matter, and can solve the problem of low image printing concentration and stable ink dispersion. Insufficient image quality, low color rendering, etc., to achieve the effect of high printing density

Inactive Publication Date: 2008-06-25
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even in the colorant obtained by the phase inversion emulsification method or the acid precipitation method, depending on the type of organic solvent such as the penetrating agent used in the ink, the polymer adsorbed on the pigment particles may fall off and be dissolved. In the ink, the dispersion stability of the ink, the ejection stability, the image quality, etc. are not enough
In the ink of Conventional Example 3, a lot of polymers adsorbed on the pigment particles come off, so from the point of view of dispersion stability, the content of the pigment in the ink is limited, so the image of the recorded matter obtained using this ink The printing density is low, especially when plain paper is used as the recording medium, image bleeding (bleeding) is easy to occur, and there is also the problem of low color rendering

Method used

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  • Microencapsulated material, microencapsulated color material, process for production of the material, ink composition, ink-jet recording method, and recorded material
  • Microencapsulated material, microencapsulated color material, process for production of the material, ink composition, ink-jet recording method, and recorded material
  • Microencapsulated material, microencapsulated color material, process for production of the material, ink composition, ink-jet recording method, and recorded material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0377] : Cationic polymer I: Synthesis of poly(styrene-co-2-methacryloyloxyethyltrimethylammonium chloride)

[0378] In a flask equipped with a stirring device, a reflux cooler, and a nitrogen introduction tube, 4.4 g of ethyl 2-bromoisobutyrate as an initiator, 250 g of styrene as a monomer, 2-methacryloxyethyl Trimethyl ammonium chloride 107g, methanol 171g as solvent, ethanol 975g, water 226g as cuprous bromide 0.32g as catalyst, tris(2-dimethylamino)ethylamine 0.61g as ligand, After replacing the inside of the flask with nitrogen, a polymerization reaction was performed at 78° C. for 8 hours. After the reaction, the polymerization solution was concentrated, and the concentrated polymerization solution was poured into isopropanol to precipitate a polymer. The polymer after polymerization was collected and vacuum-dried to obtain poly(styrene-co-2-methacryloyloxyethyltrimethylammonium chloride).

[0379] The number average molecular weight (Mn) of the obtained polymer was 1...

manufacture example 1

[0380] [Manufacturing example 1]: [Preparation of microencapsulated blue pigment dispersion (dispersion A)]

[0381] 92.4g of mixed pigment blue-15:3 (30.3% of solid content), 84g of polymer I (20% aqueous solution) synthesized as above, 103.6g of distilled water, using 0.5mmΦ zirconia beads as the medium, using self-made beads mill, disperse at 25° C. for 2 hours, and remove the beads, then adjust the pigment concentration to 8% to obtain a dispersion [1].

[0382] The obtained dispersion liquid [1] was added in a 500ml tall beaker, and the beaker was immersed in ice water, and dispersed for 5 minutes with an ultrasonic homogenizer (Nippon Seiki Manufacturing Co., Ltd.; US-600T; using chip 36mmΦ), and the liquid After the temperature dropped below 20°C, the dispersion was repeated for 5 minutes until the dispersion time became 60 minutes in total to obtain a pigment dispersion [2].

[0383] After adding distilled water to the obtained dispersion liquid [2] to dilute to 2 tim...

manufacture example 2

[0386] [Manufacturing example 2]: [Preparation of microencapsulated blue pigment dispersion (dispersion B)]

[0387] With respect to the dispersion [3] obtained in Production Example 1, as monomers, instead of styrene monomer, 7.5 g of benzyl methacrylate and 7.5 g of lauryl methacrylate were used. 1 in the same manner to obtain dispersion B.

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Abstract

The present invention provides microencapsulation for an ink composition that is excellent in dispersion stability, ejection stability, and color rendering, has excellent image fastness and scratch resistance, is less prone to image penetration, and can obtain a recorded matter with high printing density Color material, ink composition using the color material, its production method, inkjet recording method, recorded matter, and microencapsulated product. On the surface of the core substance represented by the color material particles such as pigments, the wall material mainly composed of the following substances is covered to perform microencapsulation. The substances in it are: 1) have ionic groups and hydrophobic groups and 2) a polymer (B) having at least: a first polymerization from an ionic group having a charge opposite to that carried by the polymer, a hydrophobic group, and a polymerizable group A repeating structural unit derived from a surfactant, and from a second polymerizable surfactant having the same or opposite charge to that of the first polymerizable surfactant and / or having a charge similar to that of the polymer Repeating structural units derived from hydrophilic monomers and / or hydrophobic monomers with the same or opposite charges. The aqueous medium contains a color material such as a pigment as a core material and microencapsulates it. As an ink composition, the ink composition is ejected from a nozzle on a recording medium by an inkjet recording method. object, get the record object. By constituting the core material with chemicals, metal powder, ceramics, etc., it becomes possible to perform surface modification of the core material.

Description

technical field [0001] The present invention relates to a microencapsulated product in which the surface of a core substance is covered with a wall material mainly composed of a polymer, a microencapsulated color material using color material particles as the core material, and a manufacturing method thereof, and further relates to a microencapsulated color material containing the microencapsulated color material. The coloring material is particularly preferable as an ink composition for inkjet recording. [0002] In addition, the present invention relates to an inkjet recording method using the ink composition and a recorded matter using the recording method. Background technique [0003] The inkjet recording method is a method in which ink droplets are ejected from fine nozzle heads to record characters or graphics on the surface of a recording medium such as paper. As an inkjet recording method, the practical methods include: using electrostrictive elements, converting e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C3/10B01J13/10B01J13/14B41J2/01B41M5/00C09D11/00C09B67/08C09C1/00C09D11/322C09D11/324C09D11/326C09D11/38
CPCC08K9/10C01P2004/64C08K5/0041B82Y30/00C09D11/322C09D7/1291B01J13/14C01P2004/62C08K3/0033C09C3/10Y10T428/24802C09D7/70C08K3/013C09D7/45
Inventor 宫林利行横山雅将齐藤贵宏田中秀明
Owner SEIKO EPSON CORP
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