JPS63191871A - Ink composition - Google Patents

Abstract

PURPOSE:To provide an ink compsn. suitable for use in dry lithographic printing, etc. and having excellent resistance to scumming and printability, by incorporating a specified amount of an amine compd. having active hydrogen. CONSTITUTION:0.1-15wt.% amine compd. (A) having active hydrogen, such as a polyamine (e.g., triethylenetetramine) or a polyamide resin having an MW of 500-20,000, composed of a 6-60C acid and a polyamine, is blended with rosin, a rosin-modified phenolic resin (gel) varnish (B), a colorant (C) (e.g., carbon black for printing ink) and additives (D) such as wax, a drying agent (e.g., cobalt naphthenate), a dispersant, a filler, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ink composition, particularly an ink composition suitably used in waterless lithographic printing.

[Prior Art] In contrast to the current mainstream printing method, which uses the ink repellency of dampening water, a waterless planographic printing method has been proposed that uses a planographic printing method that does not require dampening water. ,
In particular, a method of printing using a lithographic printing plate provided with silicone rubber in the non-image area has been put into practical use.

In such waterless planographic printing, it is known that printing using conventional oil-based inks causes background smearing, which is undesirable.

The phenomenon of background smudge in waterless planographic printing is caused by the friction of the drive unit and rollers of the printing press during printing, which causes the plate surface temperature to rise and the cohesive force of the ink itself to decrease, which is due to its inherent ink repellency. Ink adheres to the non-image areas.

In order to improve this problem, a method can be considered in which a large amount of binder resin component is used to increase the cohesive force and improve soil stain resistance, but this method causes problems such as pile-up on the blanket and paper smearing.

Another improvement method is to use organic clay as disclosed in Japanese Patent Application Laid-Open No. 57-12077. However, when trying to improve stain resistance with this method,
Problems such as reduction in gloss and deterioration of printability occur. Zarani JP 59-147072, JP 50-1
Japanese Patent No. 1287 proposes a method of adding organosiloxane. However, the former is used by adding it to what is already a printing ink,
The latter is added during the ink production stage, and both are used for the purpose of imparting strong cohesive force to the ink. However, when trying to achieve high stain resistance using this method, there is a problem that the ink transfer property becomes extremely poor, and there is also a problem that the ink transfer during reprinting or the film lamination process is caused by the addition of organosiloxane. Problems arise, such as the bleed-out of the

Orotakes 5040 as a commercially available ink additive
(manufactured by Dainichiseika Co., Ltd.) uses polyamide molecules. Orotake 5040 has the effect of increasing resistance to dampening water and making it difficult for the ink to emulsify compared to plate-type inks that use dampening water. Therefore, it has been shown to have the advantage of preventing background stains, floating stains, etc. caused by emulsification.

-Also, the polyamide molecules in Orotakes 5040 have been shown to polymerize with moisture in the air and dampening water molecules, promote ink setting and drying, and prevent backing.

However, when Orotix 5040 is added to a waterless lithographic ink for printing, it is found to be effective in improving ink transferability, on-press stability, etc., but it is not effective in improving background stain resistance. There is a problem that the stain resistance is lower than the previous ink.

[Problems to be Solved by the Invention] The purpose of the present invention is to solve the above-mentioned drawbacks of conventional inks,
An object of the present invention is to provide an ink composition that has excellent background stain resistance and printability.

[Means for Solving the Problems] The object of the present invention is achieved by an ink composition characterized by containing 0.1 to 15% by weight of an amine compound containing active hydrogen in the molecule. .

The active hydrogen-containing amine compounds used in the present invention include ethylamine, n-propylamine, n-
- Monoamines such as butylamine, hexylamine, laurylamine, stearylamine, ethanolamine, allylamine, ethylenediamine, trimethylenediamine, tetramethylenediamine, pentamethylenediamine,
Diamines such as hexamethylene diamine, polyamines such as diethylenetriamine, triethylenetetraamine, bishydroxydiethylenetriamine, and amine adducts can be effectively used.

In addition, amide compounds as amine derivatives include formic acid, acetic acid, propionic acid, itaconic acid, caprylic acid, glycolic acid, acrylic acid, lauric acid, myristic acid,
Monocarboxylic acids such as palmitic acid, stearic acid, oleic acid, linoleic acid, lyluic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, superric acid,
azelaic acid, sebacic acid, maleic acid, fumaric acid,
Organic dicarboxylic acids such as dimer acid, organic tricarboxylic acids such as trimellitic acid, organic carboxylic acids such as 3,9-bis(2carboxyalkyl)2,4,8.10-tetraoxaspiroundecane, and the above amines and diamines. ,
Examples include condensates with polyamines and the like.

The amine compound containing active hydrogen used in the present invention has the above-mentioned structural composition, but from the viewpoint of handling safety, polyamide resin is preferable, and from the viewpoint of compatibility with the resin and solvent, a polyamide resin having 6 carbon atoms is preferable. A polyamide resin consisting of a polyamine and an acid of 1 to 60% is particularly preferably used.

The molecular weight of the polyamide resin is 500 to 20.0.
The range is preferably 00, more preferably 500 to 10,
It is in the range of 000.

It is necessary to select the amount of the amine compound containing these active hydrogens in the range of 0.1 to 15% by weight,
More preferably, it is 0.3 to 10% by weight. Added amount is 0
．． If it is less than 1% by weight, the effect of improving dirt resistance is small;
If it exceeds 5%, problems arise with the transferability of the ink.

The amine compound of the present invention, that is, the amine or amide compound, is effective not only alone but also when used in combination of two or more, and can be used effectively even if the amine compound is diluted with a non-reactive solvent, resin, etc. be able to.

In the ink composition of the present invention, other components of the ink composition vehicle used are known ones, such as rosin, rosin ester, phenol resin, rosin-modified phenol resin, petroleum resin, alkyd resin,
Maleic acid resin, xylene resin, urethane resin, epoxy resin, drying oil, styrene, acrylic ester, urethane acrylate, polyester acrylate, epoxy acrylate, polyether acrylate, etc. can be used. Particularly preferred are rosin-modified phenolic resins, xylene resins, petroleum resins, maleic acid resins, epoxy resins, polyester acrylates, polyether acrylates, and epoxy acrylates.

Furthermore, as the colorant, those used in conventional ink compositions such as inorganic or organic pigments can be used.

In addition, as other additives, for example, wax, grease, desiccant, dispersant, filler, and other known additives can be used.

When adding an amine compound, it is possible to prepare a varnish from the amine compound and other vehicle components in an intermediate step of ink production, and then to form an ink based on this varnish, or alternatively, to add other vehicle components. It may also be added to ink made from the constituent components.

The ink composition of the present invention is particularly suitable for use as an ink for waterless lithographic printing, but of course other known ink compositions such as U ink, EB cure ink cured by electron beam, and dampening solution may also be used. It can also be effectively used in lithographic printing inks.

Also, in terms of printing applications, it can be used for printing on synthetic paper, film, metal, etc.

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

Example 1 Inks containing the amine compound triethylenetetraamine (A> and ink B not containing it) were prepared with the following compositions. When we measured the temperature at which scumming occurred, which is a measure of scumming resistance, ink (A>) had a temperature of 33°C, while ink (B) had a temperature of 25°C. Ink (A) containing tetraamine was found to be superior.

For each of these inks, printing was carried out using a waterless planographic plate having a non-adhesive layer made of silicone rubber, without supplying dampening water to the plate surface, using a dot sprint planographic printing machine.

As a result, printed matter with good ink receptivity, gloss, etc. was obtained in both cases.

Ink A An ink containing nitriethylenetetraamine.

Carbon black for printing ink 18.0 parts Alkaline blue toner '5.0 parts Rosin-modified phenolic resin varnish (I) 34.0 parts Rosin-modified phenolic resin gel varnish (n) 20.0 parts Triethylenetetramine 1.0 parts Wax Compound 3.0 parts Cobalt naphthenate 0.5 parts (metal concentration 7.5%) Manganese naphthenate 0.5 parts (metal concentration 6.5%) 1 stone No. 5 solvent 5.0 parts Total 1
00.0 parts The above mixture was kneaded using a three-roll mill, and the result was a tack of 11.8 (400 r, p, m) on an incometer.
, 1 minute value at 30° C.) was obtained.

Formulation of rosin-modified phenolic resin varnish (I).

Rosin modified alkylphenol resin 42.0 parts Polymerized linseed oil No. 4 15.0 parts Linseed oil modified alkyd resin 5.0 parts Nisseki No. 5 solvent
38.0 parts Total: 100.0 parts Formula of rosin-modified phenolic resin gel varnish (II).

Rosin-modified alkylphenol resin 45.0 parts Polymerized linseed oil No. 4 17.0 parts Aluminum octoate 1.5 parts 1 stone No. 5 solvent
36.5 parts Total 100.0 parts Ink B: Ink that does not contain amine compounds Carbon black for printing ink 18.0 parts Alkaline blue toner
5.0 parts rosin modified phenolic resin varnish (
II) 35.0 parts Rosin modified phenolic resin Gluwanis (n) 20.0 parts Wax compound 3.0 parts Cobalt naphthenate 0.5 part (metal concentration 7.5%) Manganese naphthenate 0.5 part (metal Concentration 6.5%) 1 stone No. 5 solvent 5.0 parts total 1
00.0 parts When the above mixture was kneaded using three rolls,
An ink with an index tack of 14.5 was obtained.

Method for evaluating background stain resistance (measurement of background stain occurrence index) A printing machine modified to raise the temperature of the plate surface by passing hot water into the plate cylinder.
When a waterless lithographic printing plate with a non-adhesive layer made of silicone rubber is attached and printing is performed while increasing the temperature of the plate surface without supplying dampening water, scumming occurs on the printed matter at a certain solid density. The plate surface temperature was taken as the background stain occurrence index. Ink with a high background smudge occurrence index is less likely to cause background smear in practical printing.

Example 2, Comparative Example 1 Ink C was obtained by using a polyamide resin (molecular weight 3000) obtained by condensing dimer acid and diethylenetriamine in place of triethylenetetramine in the composition of Ink A of Example 1.

Furthermore, in the ink composition of Example 1, 5 parts of a commercially available polyamide-containing ink additive "Orotakes 5040" was added instead of triethylenetetramine, and 1 part No. 5 solvent was changed from 5 parts to 1 part. I got a D.

When the scumming index of Ink C and Ink D was measured, Ink C was 35°C and Ink D was 25°C.

Ink C had improved background smudge resistance compared to Ink B, whereas Ink D only showed the same background smear resistance as Ink B.

Further, printing was carried out using a waterless planographic plate having a non-adhesive layer made of silicone rubber without supplying dampening water to the plate surface using a small dot sprint planographic printing machine. Printed matter with good ink transferability, ink receptivity, and gloss was obtained.

Example 3, Comparative Example 2 The following inks were prepared by adding 1 part of a polyamide resin (molecules 15,000) prepared by condensing dimer acid and diethylenetriamine to each of commercially available water-based lithographic inks.

Ink E: Added to TSP202 (manufactured by Toyo Ink Co., Ltd.), which is an ink for film.

Ink F: Added to UV cure ink FD-o (manufactured by Toyo Ink Co., Ltd.).

When the scumming index of the above ink was measured, as shown in the table, the scumming resistance was greatly improved.

When a printing test was conducted in the same manner as in Example 1, each ink before addition had scumming, whereas ink E and F could be printed without scumming.

[Effects of the Invention] The ink composition containing the amine compound according to the present invention has good background stain resistance and excellent printability.

Claims (1)

[Claims] 0.1 to 1 amine compound containing active hydrogen in the molecule
An ink composition characterized by containing 5% by weight.