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Emulsified ink for porous printing

A technology of emulsified ink and stencil printing, which is applied in the fields of ink, application, household appliances, etc. It can solve the problems of insufficient fixability and drying speed of colorants, slow drying speed of ink, etc., and achieve excellent fixability and prevent ink from curing.

Inactive Publication Date: 2012-11-28
TOHOKU RICOH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the ink used in Japanese Patent Application Laid-Open No. 2004-101834 is not a water-in-oil type (W / O type) emulsion ink, but an oily ink. When printing on paper, the ink dries slowly
[0009] In addition, in the case of inks added with cyclized rubber or high-molecular-weight rosin-modified resins, the fixability of the colorant on paper and the drying speed are insufficient.
[0010] In summary, so far, it has not been possible to provide an emulsion ink for stencil printing that has excellent fixability, drying speed, and water resistance of the colorant on paper, and can effectively prevent ink curing in the open state.

Method used

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  • Emulsified ink for porous printing
  • Emulsified ink for porous printing
  • Emulsified ink for porous printing

Examples

Experimental program
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Effect test

Embodiment

[0156] Although the present invention will be described more specifically based on examples, the present invention is not limited to the following examples.

[0157] In the following examples and comparative examples, "the iodine value of the drying oil" and "the weight average molecular weight of the resin" were measured according to the following methods.

[0158]

[0159] The iodine value was measured according to JIS K 0070.

[0160]

[0161] The weight-average molecular weight of the resin was measured by gel permeation chromatography and converted to polystyrene to obtain it.

Embodiment A-1～A-19 and comparative example A-1～A-10

[0163] -Preparation of emulsified ink for stencil printing-

[0164]Utilize the same method as preparing traditional emulsified ink to prepare oil phase and water phase according to the ink formulation (unit is mass %) shown in Table 1~Table 3, make two-phase emulsification in known emulsifying machine, thereby make embodiment A Emulsion inks for stencil printing of -1 to A-19 and Comparative Examples A-1 to A-10.

[0165] The specific operation is as follows: in embodiment A-16 and comparative examples A-6 and A-7, the colorant, oil and insoluble colorant dispersant are ground by a three-roll machine to prepare the insoluble colorant dispersion, and the insoluble colorant A colorant dispersion (hereinafter referred to as insoluble colorant dispersion) is added to an emulsifying surfactant, oil, drying oil (or processing oil) and varnish such as a resin to form an oil phase, and water is added to the oil phase. , antifreeze, antibacterial agent, electrolyte or water-soluble r...

Embodiment B-1

[0240]After adding and premixing the following components, they were dispersed using a bead mill to obtain an aqueous phase, wherein the premixed components were as follows: 7.0 parts by mass of Raven 760 (manufactured by Columbian) as a pigment, 1.0 parts by mass PVP K-30 (manufactured by BASF Corporation) as a water-soluble polymer, 7.0 parts by mass of glycerin (manufactured by Kao Corporation) as an antifreeze agent, 0.1 parts by mass of methylparaben (manufactured by Kanto Chemical Co., Ltd.) as an antibacterial agent, 0.1 parts by mass of magnesium sulfate (manufactured by Kanto Chemical Co., Ltd.) and 56.8 parts by mass of ion-exchanged water as electrolytes. Further, the water phase is stirred and mixed into the pre-prepared oil phase for emulsification, thereby obtaining an emulsified ink for stencil printing. Among them, the oil phase contains the following components: 10.0 parts by mass of SUNTHENE 310 (manufactured by SUNOIL Corporation) as an oil, 5.0 parts by mas...

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Abstract

The present invention provides an emulsified ink for porous printing, which is characterized in that the emulsified ink comprises 10%-90% by mass of oil phase and 90%-10% by mass of water phase, wherein the oil phase contains resin and comprises at least one component selected from drying oil and processing oil.

Description

technical field [0001] The invention relates to a W / O emulsified ink for heat-sensitive stencil printing. The colorant of the emulsified ink has excellent fixability, drying speed, and water resistance on paper, and can effectively prevent ink from curing in an open state. Background technique [0002] As is well known, the stencil printing method is to use a stencil printing base paper (stencil) with perforated parts to move ink from one side of the stencil to the other side through the perforated parts of the stencil, thereby printing ink onto the surface of a printed object such as paper. In recent years, with the development of microcomputers, etc., rotary stencil printing machines tend to be automated and easy to operate, thus increasing the application of stencil printing. However, since the drying of stencil printing is limited to osmotic drying and evaporative drying, and reactive resins cannot be used in order to prevent the ink from curing on the printing press, so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/10C09D11/02C09D11/0235C09D11/037
Inventor 浅田启介长谷川贤
Owner TOHOKU RICOH CO LTD
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