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Alcohol-based printing ink composition

By using polyurethane urea resin and specific polyester polyol in alcohol-based printing ink, combined with a high proportion of alcohol and water, the problem of insufficient pigment dispersion and re-solubility is solved, and the high performance and long-term stability of alcohol-based printing ink are achieved. sex.

Inactive Publication Date: 2015-03-11
TOYO INK MFG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when solvents with greatly different volatilization rates such as ethanol and ethyl acetate are used in combination, the ratio of ethanol components that volatilize slowly on the printing plate cylinder in the solvent composition of ink in the printing process temporarily increases. , so the vinyl chloride-vinyl acetate copolymer is precipitated, and there is a problem of insufficient resolubility in the long-term in particular.
[0007] Similarly, when a non-chlorine dispersant is used in combination, it is difficult to ensure a sufficiently satisfactory pigment dispersion state and resolubility in the range where the composition of the alcoholic solvent changes over time.

Method used

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  • Alcohol-based printing ink composition
  • Alcohol-based printing ink composition
  • Alcohol-based printing ink composition

Examples

Experimental program
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Effect test

Embodiment

[0104] The following examples illustrate the present invention more specifically, but the following examples do not limit the scope of rights of the present invention. In addition, "part" in an Example shows "weight part", and "%" shows "weight%".

[0105] In addition, the measuring methods of "resin solid content concentration", "viscosity", "amine value", "weight average molecular weight" and "acid value" in an Example are as follows.

[0106] Resin solid content concentration: In accordance with JIS K5601-1-2, the heating residual content when measured at a heating temperature of 150° C. and a heating time of 20 minutes was defined as resin solid content concentration (%).

[0107] Viscosity: Measured at 25° C. using a B-type viscometer (manufactured by Tokyo Keiki Co., Ltd., model BL).

[0108] Amine value: Measure about 3 g of polyurethane urea resin solution into a flask, add 50 ml of methanol and dissolve it, use 0.1 mol / liter hydrochloric acid standard solution, titra...

Synthetic example 1

[0115] (Synthesis example 1)

[0116] In a flask equipped with a stirrer, a thermometer, a reflux cooler, and a nitrogen inlet tube, hydrogenated castor oil polyol (product name: "URIC PH-100" manufactured by Ito Oil Co., Ltd., hydroxyl value 41.6 mgKOH / g, number average molecular weight 2697) 18 parts, polypropylene glycol (hydroxyl value 57.3mgKOH / g, number average molecular weight 1958) 72 parts, 1,3-propanediol 3.5 parts and isophorone diisocyanate 39.8 parts, react at 100°C for 6 hours under nitrogen flow A urethane prepolymer is produced.

[0117] Next, 57.1 parts of ethyl acetate was added to the obtained urethane prepolymer to prepare a homogeneous solution of the urethane prepolymer. Next, in a mixture composed of 16.7 parts of isophorone diamine, 167.9 parts of ethyl acetate, and 225 parts of ethanol, the above-mentioned urethane prepolymer solution was added dropwise over 1 hour, followed by reaction for 1 hour to obtain polyurethane A solution of urea resin (D-1...

Synthetic example 2

[0119] (Synthesis example 2)

[0120] In the flask equipped with stirrer, thermometer, reflux cooler and nitrogen inlet pipe, add 28.2 parts of hydrogenated castor oil polyol (product name: "URIC PH-100") identical to Synthesis Example 1, polypropylene glycol (hydroxyl value 57.3mgKOH / g, number average molecular weight 1958) 61.4 parts, 3.7 parts of 1,3-propanediol and 39.9 parts of isophorone diisocyanate were reacted at 100° C. for 6 hours under a nitrogen stream to produce a urethane prepolymer.

[0121]Next, 57.1 parts of ethyl acetate was added to the obtained urethane prepolymer to prepare a homogeneous solution of the urethane prepolymer. Next, in a mixture composed of 16.8 parts of isophorone diamine, 167.9 parts of ethyl acetate, and 225 parts of ethanol, the above-mentioned urethane prepolymer solution was added dropwise over 1 hour, followed by reaction for 1 hour to obtain polyurethane A solution of urea resin (D-2).

[0122] Regarding the solution of the obtai...

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Abstract

The present invention relates to an alcohol-based printing ink composition comprising a polyurethane urea resin (D) obtained by reacting a polyol (A), a diisocyanate (B), and a chain extender (C), a coloring agent (E), and a vehicle, wherein the polyol (A) comprises a polyester polyol (AO) having repeating units derived from a saturated hydroxyl carboxylic acid having side chains, and the vehicle of the alcohol-based printing ink composition comprises an alcohol (F) such that the ratio of the alcohol (F) is 50 wt% or more based on a total 100 wt% of the vehicle. Thus, the present invention provides a printing ink that comprises an environmentally-friendly alcohol as a primary component and that has excellent coloring agent dispersibility and shelf life as well as long-term excellent re-solubility.

Description

technical field [0001] The present invention relates to an alcohol-based printing ink composition. Background technique [0002] In recent years, based on the strengthening of laws and regulations and concerns about environmental protection or safety, there is a strong demand for solvents in printing inks to de-petroleumize and reduce CO 2 . In addition, biosolvents are attracting attention, in which effective use of bioethanol with low environmental load is desired. As a printing ink medium, solvents such as toluene, methyl ethyl ketone, and ethyl acetate have conventionally been suitably used, but Patent Document 1 discloses a dispersion of titanium white containing ethanol as a main component of the solvent. [0003] However, in the case of printing inks using alcohol as the main solvent, it is necessary to solubilize the binder resin with alcohol, that is, to hydrophilize it. Therefore, the compatibility between titanium white having a hydrophilic particle surface and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/102C09D11/033C09D11/023C09D11/037C09D11/10
CPCC09D11/033C09D11/102Y10T428/24802D21H19/42
Inventor 大宅彻佐藤有希户根嘉孝成广治宪
Owner TOYO INK MFG CO LTD
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