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Water-based inks for ink-jet printing

An inkjet recording, water-insoluble technology, applied in the field of water dispersions for inkjet recording, can solve problems such as insufficiency

Active Publication Date: 2007-07-04
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, although these water-based inks have been improved to a certain extent, such as image density, it is not enough, and further improvement in performance is required.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1 and 2

[0158] Manufacturing Examples 1 and 2 (Preparation of Polymer Solution)

[0159] 40.1 parts of the initially charged monomer solution (expressed in parts by weight) as shown in Table 1 was added into the reaction vessel and mixed, and the mixture was fully replaced with nitrogen to obtain a mixed solution.

[0160] On the other hand, 160.4 parts of dropwise monomers (expressed in parts by weight) shown in Table 1 were placed in the dropping funnel, and nitrogen replacement was sufficiently performed to obtain a mixed solution.

[0161] Under a nitrogen atmosphere, while stirring the mixed solution in the reaction vessel, the temperature was raised to 75° C., and the mixed solution in the dropping funnel was slowly added dropwise to the reaction vessel within 3 hours. After the dropwise addition, the liquid temperature of the mixed solution was kept at 75° C. for 2 hours, and 0.3 parts of polymerization initiator (2,2′-azobis(2) dissolved in 5 parts of methyl ethyl ketone was a...

Embodiment 1～4 and comparative example 1～2

[0170] Examples 1-4 and Comparative Examples 1-2 (manufacture of aqueous dispersion containing pigment particles and water-based ink)

[0171] 25 parts of polymers obtained by drying the polymer solutions obtained in Production Examples 1 and 2 under reduced pressure were dissolved in 71 parts of methyl ethyl ketone, and while stirring, a neutralizing agent (5N of 65% relative to the acid value) was added thereto simultaneously. Sodium hydroxide aqueous solution) (7 parts) and 211 parts by weight of ion-exchanged water, neutralize the salt-forming base, then add 75 parts by weight of the pigment described later, after fully stirring, use a micro-jet homogenizer (MICROFLUIDIZER, Micro Fluidics Co., Ltd.) was subjected to high-pressure dispersion treatment at 180 MPa and 15 times to obtain water-insoluble vinyl polymer particles containing a colorant.

[0172] The resulting slurry (about 10%) was diluted with ion-exchanged water and stirred well, then methyl ethyl ketone and wat...

Embodiment 1

[0175] Pigment 1 of Example 1: the inlet drying temperature is 150°C, the feeding speed of the wet filter cake is 47kg / h, the outlet temperature of the classifying rotor is 67-74°C, the rotating speed of the pulverizing rotor is 5000rpm, and the rotating speed of the classifying rotor is 1000rpm. Dust collection air volume is 25Nm 3 / min under the condition of crushing and grading.

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PUM

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Abstract

The present invention relates to [1] a water dispersion for ink-jet printing containing an organic pigment having a bulk of 3.5 to 20 mL / g; [2] a water dispersion for ink-jet printing including water-insoluble polymer particles containing a pigment having a bulk of 3.5 to 20 mL / g; [3] a water dispersion for ink-jet printing containing an organic pigment obtained by a pulverization / classification treatment wherein the organic pigment has D50 of 2 to 15 [mu]m and D90 of 60 [mu]m or less; [4] a water-based ink for ink-jet printing containing the respective water dispersions which is excellent in election reliability, image density, image uniformity and rubbing resistance; and [5] a process for producing the respective water dispersions.

Description

technical field [0001] The present invention relates to an aqueous dispersion for inkjet recording, an aqueous ink containing the aqueous dispersion, and a method for producing the aqueous dispersion. Background technique [0002] The inkjet recording method is a recording method in which ink droplets are directly sprayed from very fine nozzles onto a recording member and adhered to obtain characters or images. This method is very popular because it has many advantages such as easy full-color printing, low cost, ordinary paper can be used as a recording member, and non-contact with the printed matter. [0003] In particular, materials using pigment-based inks as colorants are becoming mainstream from the viewpoint of weather resistance and water resistance of printed matter (for example, refer to Patent Documents 1 to 3). [0004] Patent Document 1 discloses an aqueous ink in which a pigment is contained in a vinyl polymer, and a graft polymer using a macromer is used as th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/10C09D17/00B41J2/01B41M5/00C09D11/00C09D11/322
CPCC09B67/009C09B67/0002C09D11/322
Inventor 永岛茂树榊原诚岩崎俊哉
Owner KAO CORP