JPH0343471A - Printing ink composition - Google Patents

Abstract

PURPOSE:To obtain the subject novel composition improving ink viscosity without increasing tack of ink and preventing generation of misting containing a specific amount of pigment, a binder resin, a high boiling petroleum-based solvent and a specific aminoalcohol. CONSTITUTION:The objective composition contains a pigment (e.g. organic or inorganic pigment), a binder resin [e.g. petroleum resin (hydrocarbon resin) or a rosin ester resin)] and a high boiling petroleum-based solvent (preferably having >=200 deg.C boiling point, e.g. paraffin-based or linseed oil) as main components and further contains 0.1-10wt.% aminoalcohol (preferably ethanolamines such as monoethanolamine) expressed by the formula (R1 is H or 1-4C alkyl; R2 is 2-4C alkylene; (m+n)=3, (m) is 0 or positive integer and (n) is positive integer).

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to printing ink compositions, and particularly aims to provide a novel printing ink 4q composition that prevents the occurrence of misting.

<Prior art and its problems> Currently, there are two types of printing inks in general use: paste ink and liquid ink. On the other hand, the latter is mainly used for printing on cardboard, plastic films, etc. using rubber letterpress or intaglio.

In recent years, printing has become more sophisticated and printing operations have become faster, and printing inks are required to have various printing aptitudes under high-speed printing.

In the pasty printing ink that is the object of the present invention, that is, the oil-based ink whose main components are pigment, binder resin, and high-boiling petroleum solvent, misting occurs more frequently during printing than before due to the significant improvement in printing speed. is becoming a problem.

The cause of misting during printing is that in the case of these paste inks, the number of rollers in the printing machine is large and the tack of the ink itself is high, so misting is generally more likely to occur compared to liquid ink, and especially when printing at high speeds. This is a serious problem in newspaper printing, rotary offset printing, and metal can printing. Needless to say, this misting impairs the quality of printed matter, causes contamination of the printing press and workers, and has an undesirable effect on health.

In order to solve this misting problem, various efforts have been made from both the mechanical and ink sides. However, this requires the addition of extra equipment or
It also had other problems such as reduced workability.

On the other hand, as a method for preventing the occurrence of misting by improving the ink itself, for example, Japanese Patent Publication No. 62-3187,
Japanese Patent Publication No. 61-38748 and Japanese Patent Publication No. 54-21761 disclose the use of modified hydrocarbon resins, and Japanese Patent Publication No. 57-47367 discloses the use of non-aromatic oils. Since both of them contain these components as their main components, they have the problem of inevitably deteriorating the performance of the printing ink. Also, JP-A-55-121
No. 92 and JP-A No. 58-89670 disclose the use of oxidized wax salts or complexes, or a method of emulsifying water in the ink, but while the uses of the ink are limited, the stability is This also left problems. Further, JP-A No. 55-31885 discloses the addition of fillers such as clay and talc, but this causes problems in fluidity of the ink, piling, etc.

Therefore, as printing operations become increasingly faster, the present invention aims to provide a pasty printing ink composition that has the ability to prevent the occurrence of misting that completely impairs conventional printing quality and printability. be.

<Means for Solving the Problem> That is, the present invention provides a printing ink composition containing a pigment, a binder resin, and a high-boiling petroleum solvent as main components, which is represented by the general formula (Rr) -N (RaOH) -. The amino alcohol is added to the printing ink composition at 0.0%.
The present invention provides a printing ink composition (claim 1) characterized in that it contains 1 to 10% by weight.

The present invention also provides a printing ink composition (Claim 2), wherein the amino alcohol represented by the general formula is an ethanolamine.

First, specific examples of compounds represented by the general formula include monoethanolamine, N-methyljetanolamine,
N,N-diethylethanolamine, N-propylethanolamine, N,N-dipropylethanolamine,
N-butyl ethanolamine, N,N-dibutyl ethanolamine, jetanolamine, N-methyl jetanolamine, N-ethyl jetanolamine, N-propyl jetanolamine, N-butyl jetanolamine, triethanolamine, etc. Examples include ethanolamines, propatoolamines having a similar substituent group, and butanolamines, which can be used alone or in combination.

In addition, in the general formula, when R is an alkyl group having 5 or more carbon atoms, almost no misting prevention effect is observed.

Furthermore, if the amount of amino alcohol blended in the printing ink composition is less than 0.1% by weight, it cannot be expected to substantially prevent misting, and if it exceeds 10% by weight, the ink will thicken, fluidity will decrease, and gloss will occur. This is not desirable as a decrease in

In addition, in the printing ink composition according to the present invention, organic and inorganic pigments commonly used in printing inks can be used as pigments, and as binder resins, petroleum resins (hydrocarbon resins), rosin ester resins, rosin maleic resins can be used. , rosin phenol resin, alkyd resin, oil-free alkyd resin, etc., which can be used alone or in combination depending on the printing method.

In addition, high boiling point petroleum solvents include paraffinic, olefinic, and aromatic solvents with a boiling point of 200°C or higher, and dry and semi-drying vegetable oils such as linseed oil, tung oil, and dehydrated mustard oil. Can be used.

In the case of metal printing ink, glycol-based, glycol ester-based, and glycol ether-based solvents, as well as amino resins such as melamine resin and benzoguanamine resin, can be used in combination.

In addition, various additives such as a pigment dispersant, a lubricant for improving abrasion resistance, a drying property regulator, and a plasticizer can also be added as necessary.

In manufacturing the intended printing ink, components such as pigment, binder resin, and solvent can be used and manufactured by kneading and mixing by ordinary means.

In the production of the printing ink according to the present invention, the amino alcohol can be added either in the varnish or in the printing ink, and can be added at any time such as in the intermediate stage of ink production or in the finishing stage of the ink. be.

In addition, in printing using oil-based ink, since dampening water is usually used in lithographic printing, the occurrence of problematic misting is considerably suppressed because the ink and dampening water emulsify to some extent. However, misting is particularly likely to occur when used in waterless planographic printing that does not use dampening water, dry offset printing such as metal printing, or letterpress printing, and the ink of the present invention was applied to these printing methods. It is sometimes extremely effective.

It should be noted that the cause of misting in printing ink is thought to be caused by the ink's stringy phenomenon or the high viscosity of the ink. When hair amino alcohol is added, the viscosity of the ink can be improved without making the tack of the ink unnecessarily high, which seems to have solved these problems.

Hereinafter, the present invention will be specifically explained with reference to Examples.

<Example> 1 Hydrocarbon resin (NP-120, manufactured by Nippon Petrochemical Co., Ltd.) 4
0 parts, alkyd resin (Arachid No. 1, manufactured by Arayo Kagaku Co., Ltd.), 30 parts, and mineral oil (No. 5 solvent, manufactured by Nippon Petrochemicals Co., Ltd.) - O parts were heated and melted at 160°C for 1 hour to form varnish 1. get. After mixing 1.63 parts of this varnish with 25 parts of carbon black, it was kneaded with three rolls, and 10 parts of No. 5 solvent and 2 parts of a cobalt dryer were added, followed by letterpress ink 1 (Comparative Example 1). obtain. 1 part of triethanolamine and 1 part of No. 5 solvent are added to 100 parts of this ink to obtain letterpress black ink A (Example 1).

55 parts of No. Solvent (manufactured by Nippon Oil Corporation) and 0.7 parts of aluminum chelate were heated and reacted at 160° C. for 1 hour to obtain Varnish 2. After mixing 20 parts of cyanine pigment with 2.60 parts of this varnish, it was kneaded with three rolls, and further 19 parts of No. 6 solvent and 1 part of cobalt dryer were added. 2) is obtained. 5 parts of triethanolamine to 100 parts of this ink
1 part to obtain waterless lithographic printing ink B (Example 2).

3 ・Mix 45 parts of oil-free alkyd varnish (LV-298, manufactured by Rotor Chemical Co., Ltd.), 15 parts of methylated melamine resin (Cymel 303, manufactured by Mitsui Toatsu Chemical Co., Ltd.), and 25 parts of carbon black, and prepare 3 bottles. The mixture is milled using a roll mill, and 15 parts of tridecyl alcohol is added thereto to obtain dry offset printing ink 3 for 2-piece cans (Comparative Example 3).

5 parts of N-butyljetanolamine to 100 parts of this ink.
1 part, and 3 parts of tridecyl alcohol to obtain dry offset printing ink C (Example 3).

夾翞JL4-Oil-free alkyd varnish (LV-298) 45
1 part, 5 parts of N-butyljetanolamine, and 3 parts of tridecyl alcohol to obtain Varnish 4.

Next, add 53 parts of this varnish 4 and Carbon Bra Tsuku 2.
After mixing 5 parts of methylated melamine resin (Cymel 303) and 15 parts of methylated melamine resin (Cymel 303), the mixture was kneaded in a three-roll mill, and 15 parts of tridecyl alcohol was added thereto to prepare dry offset printing ink D for 2-piece cans (Example). 4) is obtained.

X Niflu Oil-free alkyd varnish (LV-298) 45
parts, 25 parts of carbon black, methylated melamine resin (
After mixing 15 parts of Cymel 303), 5 parts of N-butylgetanolamine, and 3 parts of tridecyl alcohol, the mixture was kneaded in a three-roll mill, and 15 parts of tridecyl alcohol was added thereto, followed by dry production for a two-piece can. Offset printing ink E (Example 5) is obtained.

0.05 parts of N-butylgetanolamine and 3 parts of tridecyl alcohol were mixed in the printing ink 3 of Comparative Example 3 on L-tamp;
Dry offset printing ink 4 for 2-piece cans is obtained.

11 parts of N-butylgetanolamine and 7 parts of tridecyl alcohol were mixed with the printing ink 3 of Comparative Example 3 to obtain a dry offset printing material 5 for 2-piece cans.

Evaluation - Printing is performed using each printing method using each of the printing inks obtained in Examples 1 to 5 and Comparative Examples 1 to 5, and the degree of misting and other print suitability are evaluated.

The evaluation method was as described below, and the results are shown in Table 1.

Viscosity; Plastic viscosity (25°C) measured by Raley viscometer is shown.

Liquidity; Measure with a spread meter and judge whether it is good or bad.

Transferability, gloss, background smudge; Print using each printing machine and printing plate, and judge transferability, gloss, and background smudge.

Misting: Apply each ink to the inkometer and
RPM, rotated at 30° C. for 5 minutes, and compared and evaluated based on the degree of misting on white paper placed under the roller.

Effect> As explained above in Examples, etc., according to the printing ink composition of the present invention, ink viscosity can be improved without making the ink tack unnecessarily high. The printing ink composition of the present invention, which can significantly solve the misting problem caused by the pulling phenomenon, etc., and which is different from the present invention in which amino alcohol is added, can be used in various inks, especially letterpress inks, dry offset inks, and even , which can be effectively used in waterless lithographic ink printing that does not use dampening water.

Procedural amendment (voluntary) Name of invention printed on the first day of March 1990 Printing ink composition 3 Person making the amendment Patent applicant related to the case 4゜Date of amendment order voluntary 5゜Subject of amendment) Contents of amendment In the "Detailed Description of the Invention" section of the specification, page 4, line 17, "impairing" is corrected to "without impairing", page 5, line 7 of the specification, "alkyl group" is replaced with "alkylene group". I am corrected.

2. Scope of Claims" column as attached appendix "Scope of Claims" 0 alcohol in the printing ink composition
．． A printing ink composition characterized by containing 1 to 10% by weight.

- Formula (R+) -N (R20H).

2) The printing ink composition according to claim 1, wherein the amino alcohol represented by the formula is an ethanolamine. ”

Claims (1)

[Scope of Claims] 1) In a printing ink composition containing a pigment, a binder resin, and a high boiling point petroleum solvent as main components, an amino alcohol represented by the following general formula is added to the printing ink composition in an amount of 0.
A printing ink composition characterized by containing 1 to 10% by weight. General formula (R_1)_mN(R_2OH)_n [In the above general formula, R_1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R_2 represents an alkyl group having 2 to 4 carbon atoms. Further, m+n=3, where m represents 0 or a positive integer, and n represents a positive integer. 2) The printing ink composition according to claim 1, wherein the amino alcohol represented by the general formula is an ethanolamine.