JPH05112745A - Ink solvent - Google Patents

Abstract

PURPOSE:To provide an ink solvent which is highly safe and not detrimental to ink properties by using a specific monoester of a fatty acid as the main component. CONSTITUTION:A monoester of a fatty acid of the formula: R1C(O)OR2 (wherein R1 is 5-21C alkyl; and R2 is 1-4C alkyl) is used as the main component.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solvent for ink, especially a high boiling point solvent for ink.

[0002]

2. Description of the Related Art Solvents conventionally used for ink are
There are petroleum hydrocarbons, alcohols such as IPA, glycol compounds, ketones, and acetic acid esters. Among them, the solvent used for the high boiling point solvent having a boiling point of 200 ° C. or higher was mainly petroleum hydrocarbons. High-boiling solvents other than petroleum hydrocarbons include tridecanol, diethylene glycol, triethylene glycol, dipropylene glycol, glycerin, diethylene glycol monobutyl ether, diethylene glycol monoethyl ether acetate, and diethylene glycol monobutyl ether acetate.

[0003]

In recent years, from the viewpoints of the health of the ink handler and the safety of the printed matter due to the residual solvent component of the ink, there is a demand to reduce the amount of these solvents and enhance the safety. As a method of reducing the amount of these solvents to enhance the safety, there is a method of increasing the content of animal and vegetable oils and fats such as linseed oil, which is a vehicle constituent of the ink, and reducing the use ratio of the solvent. However, if the content of animal and vegetable oils and fats in the ink is increased, the viscosity of the ink will remarkably increase. Therefore, an ink having a high proportion of animal and vegetable oils and fats has less fluidity than conventional inks and is inferior in usability. In addition, in the case of inks that are particularly required to be permeated and dried, if the viscosity of the vehicle is high, the permeation rate is slow and the drying properties are poor. In order to solve these problems by the conventional technique, it is necessary to use a solvent such as a petroleum-based solvent which has been conventionally used to some extent.

In view of such a situation, an object of the present invention is to
Another object of the present invention is to obtain an ink solvent that is highly safe and does not impair the performance of conventional inks without using conventional petroleum-based solvents.

[0005]

As a result of earnest research, the present inventor has found that the following fatty acid monoesters meet this purpose, and completed the present invention. That is, the present invention is
It is an ink solvent containing a fatty acid monoester represented by the following general formula 1 as a main component.

[0006]

[Chemical 1]

The fatty acid constituting the fatty acid monoester in the present invention has 5 to 21 carbon atoms in the alkyl residue, that is,
Caproic acid, caprylic acid, capric acid, isooctanoic acid, isononanoic acid, lauric acid, myristic acid, palmitic acid, palmitooleic acid, stearic acid, isostearic acid, hydroxystearic acid, oleic acid, linoleic acid, ricinoleic acid, linoleic acid , Eleostearic acid, arachidic acid, arachidonic acid, behenic acid, erucic acid and the like. A mixture of these fatty acids is sufficient, and a mixture that is inexpensive in practical use is desirable. Further, these fatty acids are mainly derived from animal and vegetable oils and fats, and in practice, coconut oil fatty acid, palm oil fatty acid, rapeseed oil fatty acid, soybean oil fatty acid, hydrogenated soybean oil fatty acid, linseed oil fatty acid, tung oil fatty acid,
Tall oil fatty acid, beef tallow fatty acid, fish oil fatty acid, dimer acid, etc., or fractionated fatty acid obtained by distillation thereof can be used.

The alcohol constituting the fatty acid monoester in the present invention has 1 to 4 carbon atoms in the alkyl group, that is,
Examples include methanol, ethanol, propanol, isopropanol, butanol and isobutyl alcohol.

Esterification is an alcoholysis from fats and oils,
Alternatively, it can be easily obtained by directly esterifying a fatty acid by a conventional method. The obtained ester may be purified by distillation, decolorization, deodorization and the like.

The boiling point of the ester of the present invention is about 206 ° C. with the lowest methyl caproate, and then the boiling point rises as the carbon number increases. The viscosity has a similar tendency, and the composition of the ester can be selected according to the use of the ink. Each of the esters of the present invention sufficiently dissolves rosin, phenol resin, petroleum resin, etc., which are resin components of ink.
The viscosity of the ink and the boiling point of the solvent can be controlled by changing the alkyl group composition of the ester. Therefore, it is possible to sufficiently replace the conventional petroleum-based high boiling point solvent. The ester of the present invention has an advantage that the ester bond is easily decomposed in the ecosystem, and the decomposed products, fatty acid and alcohol, are highly safe because of their origin. As described above, the ink using the ink solvent of the present invention can be used as a highly safe solvent for lithographic inks such as newspaper inks, which require permeation drying, or for letterpress inks, especially using high boiling point solvents. Is.

[0011]

【Example】

Example 1 Soybean oil was subjected to alcoholysis with methanol to obtain soybean fatty acid methyl ester. The boiling point of this ester is 300 ℃
That was all. 30 parts of soybean fatty acid methyl ester, 30 parts of linseed oil, and 40 parts of rosin were heated and stirred at 180 ° C. under a nitrogen stream, and as a result, they were uniformly dissolved. The viscosity of this vehicle was 40St.

Example 2 Caprylic acid obtained by distilling coconut oil fatty acid was directly esterified with methanol to obtain caprylic acid methyl ester. The boiling point of this ester was 230 to 250 ° C. Caprylic acid methyl ester 30 parts, linseed oil 30
Part, 40 parts of rosin-modified phenolic resin, under a nitrogen stream,
As a result of heating and stirring at 180 ° C., it was uniformly dissolved. The viscosity of this vehicle was 10St.

Example 3 Isostearic acid obtained by distilling beef tallow dimer acid was directly esterified with isobutyl alcohol to obtain isostearic acid isobutyl ester. The boiling point of this ester was 300 ° C. or higher. 30 parts of isostearic acid isobutyl ester, 30 parts of linseed oil, and 40 parts of rosin-modified phenol resin were heated and stirred at 180 ° C. under a nitrogen stream, and as a result, they were uniformly dissolved. The viscosity of this vehicle is 10
It was 0St.

Example 4 20 parts of carbon black was kneaded into 80 parts of each vehicle of Examples 1, 2, 3 and Comparative Example 1 to prepare an ink-like paste. As a result of applying this paste thinly to a newspaper and leaving it for one day and night, the same dried state was obtained.

Comparative Example 1 A commonly used ink composition was formulated for comparison. High boiling point petroleum solvent (boiling point: 290-310 ° C) 30
Parts, 30 parts of linseed oil, and 40 parts of rosin-modified phenol resin were heated and dissolved at 180 ° C. under a nitrogen stream. The viscosity of this vehicle was 80St.

[0016]

As shown in the examples, the vehicle using the ester of the present invention as a solvent is similar to the vehicle using a high boiling point petroleum solvent, and the resin and the drying oil ( Linseed oil) is contained at an appropriate viscosity, and the ink using this vehicle has almost the same performance as conventional products. The ester of the present invention uses a fatty acid that is derived from animal and vegetable fats and oils,
Higher safety than petroleum solvent. In addition, animal and vegetable fats and oils are reproducible resources, and the present invention is industrially superior also in this respect.

Claims (2)

[Claims] 1. An ink solvent containing a fatty acid monoester represented by the following general formula 1 as a main component. [Chemical 1] 2. The ink solvent according to claim 1, wherein R _{1 in the} general formula 1 is an alkyl residue of a fatty acid derived from animal and vegetable oils and fats.