JP3028679B2 - Printing ink - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

"Object of the Invention"

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing ink containing a solvent for a printing ink having low aromaticity and low toxicity.

[0002]

2. Description of the Related Art Conventionally, aromatic components such as benzene, toluene, and xylene in various solvents which are widely used generally have skin irritating effects on the human body as regulated by the Industrial Safety and Health Law. Strict regulations are taken to cause neuropathy and the like. Also, just as the International Labor Organization (ILO) recently adopted a treaty to protect the safety of workers handling chemicals, there is a growing international momentum to protect humans from the harm of chemicals. .

[0003] Conventional solvents for printing inks contain 15 to 20 aromatic components in addition to paraffinic and naphthenic components.
% By weight. Although no aromatic component is contained as in Solvent No. 0 (made by Nippon Oil Co., Ltd.), those containing 100% by weight of a paraffinic component generally have poor solubility in a printing ink resin, and the fluidity of the printing ink is poor. Deteriorates, resulting in poor transfer.

[0004]

SUMMARY OF THE INVENTION From the above points,
There has been a demand for a low-aromatic, low-toxic solvent which has excellent physical properties as a printing ink, improves the environment at the work site, and protects the health of workers at the work site. "Configuration of the Invention"

[0005]

That is, the present invention provides the following:
5.6% by weight or more of a paraffin component and 24.1% by weight or less of a naphthene component are the main components, and 0.1 to 1%.
Contains an aromatic component by weight and has a boiling point of 200 ° C. to 400 ° C.
And a rosin phenol resin having a solubility defined by the following formula x of 13% or less. x (%) = resin (2 g) / [resin (2 g) + solvent (yg)] × 100 (where y is 2 after heating and dissolving 2 g of resin with a solvent)
It represents the minimum amount of solvent (g) that does not become cloudy when cooled to 5 ° C. ) Further, the present invention relates to the present invention, wherein the paraffin component is 77.8-7.
The printing ink according to claim 1, wherein 5.6% by weight and the naphthene component are 22.1 to 24.1% by weight. Further, the present invention provides a solvent for a printing ink having an aniline point of 65 ° C to 95 ° C.
C. for the printing ink.

The solvent of the present invention has an aniline point of 65 to 95 ° C.
Is desirable. If a solvent having an aniline point higher than 95 ° C. is used, the solubility with the resin used in the ink composition is poor,
The fluidity of the ink is insufficient, and as a result, the leveling on the printing medium is poor, and only a glossless printed matter is obtained. On the other hand, an ink using a solvent having an aniline point lower than 65 ° C. has poor releasability of the solvent from the ink film during drying and causes drying deterioration.

As the solvent according to the present invention, for example, AF Solvent of Nippon Oil Co., Ltd. can be used. In general, printing ink is used in addition to a solvent for printing ink. Pigment 10 to 25 (% by weight) Rosin phenol resin 20 to 25 Alkyd resin 0 to 5 Dry oil 0 to 25 Solvent 10 to 40 Drying accelerator 0 to 3 Other additives 0 Consists of

As the pigment, known general pigments, for example, benzidine yellow, lake red C, carmine 6B, phthalocyanine blue, carbon black, and, if necessary, an inorganic pigment or an extender pigment as a fluidity modifier are used.

Further, any known rosin phenol resin may be used. It is preferable that these resins have good solubility in a printing ink solvent. If the solubility is poor, the fluidity of the ink deteriorates, and the leveling property decreases.

Generally, the weight average molecular weight of the rosin phenol resin is desirably 10,000 to 200,000. However, when the weight average molecular weight is 50,000 to 200,000, the solubility deteriorates. Therefore, in this case, it is desirable to use an alkylphenol having a long carbon number such as octylphenol or nonylphenol as the phenol used in the rosin phenol resin.

The alkyd resin may be a known oil-modified alkyd resin. The drying oil may be a known soybean oil, linseed oil, tung oil or a blown oil thereof, or an oxidized polymerized oil. Further, a drying accelerator such as cobalt or manganese is used. Further, known additives such as an anti-wear agent, a surfactant and a gelling agent are used. These inks are used for sheet-fed inks, web offset inks, news inks, etc. by adjusting the viscosity to an appropriate value. Hereinafter, the present invention will be described in more detail with reference to specific examples.

1. Table 1 shows a comparison of oil between the conventional printing ink solvent and the printing ink solvent of the present invention. The numbers in the columns of aromatic, naphthenic, and paraffin in Table 1 indicate weight%.

[0013]

[Table 1]

2. Table 2 shows the properties of the resin.

[0015]

[Table 2]

[0016]

3. When the fluidity of the ink is deteriorated in other examples of the printing ink solvent, the following solvent may be used in an amount of 0 to 15%.

[0018]

[Table 3]

4. Varnish formula

[0020]

[Table 4]

The above resin was dissolved in a solvent, linseed oil at 180 ° C., the temperature was lowered to 160 ° C., 0.8% of ALCH was added, and the mixture was stirred for 1 hour to obtain a varnish.

5. Ink formulation and properties

[0023]

[Table 5]

[0024]

According to the present invention, by making a printing ink using a printing ink solvent in which the aromatic component is reduced to 1% or less, the workplace environment is improved while maintaining the ink adequacy, and the health of the site workers is improved. I can protect it.

Continuation of the front page (56) References JP-A-63-15869 (JP, A) JP-A-63-312374 (JP, A) JP-A-51-68319 (JP, A) JP-A-1-292078 (JP, A) , A) JP-A-2-166175 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C09D 11/02

Claims (3)

(57) [Claims] 1. A main component comprising 75.6% by weight or more of a paraffin component and 24.1% by weight or less of a naphthene component, further containing 0.1 to 1% by weight of an aromatic component, and having a boiling point of 200 ° C. to 200 ° C. A printing ink comprising a solvent for a printing ink at 400 ° C. and a rosin phenol resin having a solubility defined by the following formula x of 13% or less. x (%) = resin (2 g) / [resin (2 g) + solvent (yg)] × 100 (where y is 2 after heating and dissolving 2 g of resin with a solvent)
It represents the minimum amount of solvent (g) that does not become cloudy when cooled to 5 ° C. ) 2. The printing ink according to claim 1, wherein the paraffin component is 77.8 to 75.6% by weight and the naphthene component is 22.1 to 24.1% by weight. 3. An aniline point of a solvent for printing ink is 65 ° C.
The printing ink according to claim 1, which has a temperature of from −95 ° C.