JPH02166175A - Ink for dry lithographic rotary press - Google Patents

Abstract

PURPOSE:To obtain the title ink having good scumming resistance and freed from hicky, picking and web break by mixing a high-MW rosin-modified phenolic resin with a normal paraffin and an alpha-olefin solvent. CONSTITUTION:A dry lithographic rotary press ink is produced by mixing a rosin-modified phenolic resin of a weight-average MW >=110000 (e.g. a resin obtained by reacting a resol phenolic resin with a rosin and a polyalcohol) with a normal paraffin desirably of a b.p. >=200 deg.C, and an alpha-olefin solvent. This ink is excellent in scumming resistance, and free from hicky. picking and web break, so that it is desirably used for lithographic rotary press.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an ink for waterless lithographic rotary presses, and more specifically, it has good background stain resistance in waterless lithographic printing, and is free from scratches, paper flakes, and paper breakage. This invention relates to an ink for use in rotary printing presses without nine lines, which is excellent in suitability for rotary printing and does not generate any of the following.

[Conventional technology]

Current lithographic printing methods are available on sheet-fed printing presses and rotary printing presses. Both methods utilize the property that water and oil-based ink repel each other, and use a plate consisting of a hydrophilic non-print area and a lipophilic print area, and apply water to the hydrophilic non-print area. and then apply oil-based ink to the lipophilic image area.
Printing is then carried out by transferring the oil-based ink in the image area to the substrate to obtain the desired printed material.

However, in such a planographic printing method, it is difficult to control dampening water, which serves to prevent ink from adhering to non-image areas, and this is a technical obstacle. Therefore, in sheet-fed planographic printing, waterless planographic printing using a planographic printing plate that does not require such a dampening water sound has already been put into practical use.
More than 50 dedicated machines are in operation using the waterless lithographic ink described in Publication No. 9-196374 and the like.

[Problem to be solved by the invention]

However, rotary lithography prints at much higher speeds than sheet-fed lithography, requires lower tack printing inks, and is connected to the printing press. The used platinum catalyst in the dryer is used as an anti-scattering agent for waterless lithographic ink.
Inks for lithographic rotary presses have not yet been put to practical use because the catalytic action is deactivated by silicon and silicon-modified substances contained in the inks.

The problem to be solved by the present invention is to provide an ink for a waterless lithographic rotary press that is used on a lithographic printing plate that does not require dampening water, similar to sheet-fed lithographic printing.

[Means to solve all problems]

In order to solve all of the above problems, the present invention has the following characteristics: (1) a rosin-modified phenolic resin having a weight average molecular weight of 110,000 or more, (2) a normal paraffin, and (3) an α-olefin solvent. Provides ink gold for waterless lithographic printing presses.

The rosin-modified phenolic resin used in the present invention is usually obtained by reacting a resol type phenolic resin, a rosin, and a polyhydric alcohol. Examples of resol-type phenolic resins include phenol, Kunzol, paratajallic 8-nor, paraoctylphenol, and paranonylphenol bt! Phenols such as raphenylphenol, bisphenol A, and a4 aminophenol are reacted with formaldehyde and gold in the presence of an alkali catalyst by a known and conventional method, followed by neutralization with acid and optionally washing with water. It is something. Examples of the rosins include wood rosin, mulch rosin, and tall oil rosin. The polyhydric alcohol is not particularly limited, but preferably has 2 to 15 carbon atoms, and specifically includes ethylene dalycol, propylene glycol,
Examples include butylene dalicol, diethylene glycol, diethylene glycol, hexanediol, hexanetriol, trimethylolgulonochin, glycerin, interaerythritol, and diintererythritol.

The weight average molecular weight of the rosin-modified phenol resin used in the present invention is 110,000 or more, and although the upper limit of the weight average molecular weight is not particularly limited, it is usually preferably 250,000 or less. If the weight average molecular weight is less than 110,000, the cohesive force of the ink cannot be maintained with the usual usage amount, and the stain resistance may not be satisfied. This is not desirable because there is a tendency that there is no such thing. In order to increase the cohesive force and satisfy the stain resistance, it is necessary to use a large amount of resin, and using a large amount of resin is not preferable because the tack of the ink tends to deteriorate the suitability for multi-printing.

The rosin-modified phenolic resin is preferably contained in the ink for a waterless lithographic rotary press of the present invention in the form of a mixed solvent varnish described below.

The content of the rosin-modified phenolic resin is preferably in the range of 5 to 40% by weight of the ink for a waterless lithographic rotary press of the present invention, and preferably in the range of 20 to 50% by weight of the varnish.

The content of the 7 varnish is preferably in the range of 35 to 75% by weight of the ink for waterless lithographic rotary presses of the present invention.

Conventionally used in lithographic ink for rotary presses2
Among high boiling point petroleum solvents at 00 to 350°C, mixed solvents of paraffinic hydrocarbons, naphthenic hydrocarbons, and aromatic hydrocarbons (e.g., Nippon Oil Co., Ltd. No. 11, No. 3 Pull Bent, No. 4 Tru Bent, When using varnish (such as No. 5 solvent), the solubility of the resin is high, so the tack of the varnish tends to increase and the viscosity tends to decrease. The tack of the paper tends to increase, causing paper smearing or paper breakage, resulting in poor printability.

Therefore, the solvent contained in the ink of the present invention or used in the production of the ink composition of the present invention is a mixed solvent consisting of a petroleum solvent containing normal paraffin as a main component and an α-olefin solvent. preferable.

The boiling point of normal/9 rough-in is preferably 200°C or higher.

The content of normal/9 rough-in in the petroleum solvent is preferably 98% by weight or more.

Commercially available petroleum solvents containing normal/9 rough-in as the main component include, for example, "O-Tsuru M" and "0
Examples include "Tsuru H".

The boiling point of the α-olefin solvent is preferably 200°C or higher.

Commercially available α-olefin solvents include Mitsubishi Chemical Corporation (
Dialene 168 J manufactured by Co., Ltd., and Shell Chemical Co., Ltd.
Examples include Neo R71214J, Neoden 1618 J, etc. 〇Normalno J/Rough-in Petroleum solvent with gold as the main component and α-
Mixed with olefin solvent, the weight ratio is 10:90 ~
90:10(7) range is good! s 40 ”60
A range of 80:20 is particularly preferred. If the content of the petroleum solvent whose main component is normal/9 rough-in is less than 10% by weight, the solubility of the rosin-modified phenolic resin will increase, the tack of the varnish will increase, the viscosity will decrease, and the resistance will decrease. If an attempt is made to satisfy background smudge resistance, the tack of the ink will increase, paper smearing or paper breakage will occur, and printing suitability will tend to deteriorate, which is undesirable. Normal/9 The content of petroleum solvent whose main component is rough-in is 90.
If the weight exceeds by 1.5 cm, the dissolving power of the solvent will be too low and the rosin-modified phenol resin used in the present invention will tend to be difficult to dissolve, which is not preferable.

The content of the mixed solvent consisting of a petroleum solvent containing normal paraffin as a main component and an α-olefin solvent is 20 to 50% in the varnish used in the present invention. A range of lli% is preferred.

As other components used in the ink for a waterless lithographic rotary press of the present invention, known components that have been conventionally used in lithographic printing can be used.

Examples of resins that are one of these components include phenolic resins, alkyd resins, rosin ester resins,
Examples include petroleum resin, maleic 1!2m fat, and the like. Examples of drying oils and semi-drying oils include linseed oil, tung oil, soybean oil, safflower oil, and castor oil. These components may be added alone or may be combined with the rosin-modified phenol resin of the present invention. Examples of the chlorinating agent include organic aluminum compounds, organic titanate compounds, organic zinc compounds, and organic calcium compounds.

Further, as the coloring agent when used as an ink, all those used in conventional ink compositions such as inorganic or organic pigments can be used.

Furthermore, waxes, greases, dispersants, fillers, and other known agents may be used as required.

The ink kneaded with three rolls of gold layer material as described above has a high scumming temperature and has excellent printability.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to Examples, but the present invention is not limited thereto.

Example 1 (Production of Gluwanis A) Rosin modified phenolic resin (weight average molecular weight 140.0
00) 40.0 weight 1 part and polymerized linseed oil No. 4 20.0
After heating the parts by weight at 190 to 200°C for 60 minutes, 1.0 parts by weight of "Offtope A1" (a gluing agent for varnish manufactured by Ho 7" Hiroyaku Co., Ltd.) and "Otsuru HJ (Nippon Oil Co., Ltd.) were added. petroleum solvent for fissure ink) 20.0 parts by weight and
Guialene 168J (Mitsubishi Chemical Industries, Ltd.) fissure α-ole 7 Weight mf: Addition mu, Tel 50-16 Heating to obtain gluwanis At-.

(Manufacture of ink A) “First Dan Blue TGRJ (indigo pigment manufactured by Dainippon Ink and Chemicals Co., Ltd.) In-solvent) 1
9.0 Added at 0℃ for 30 minutes 14.0 parts by weight Gluwanis A 75.0 parts by weight rfia V7168J 11.0
! f! Is Using the above raw materials, kneading was carried out using a three-roll method in a conventional manner to obtain an ink Ave-9.

Comparative example 1 (Manufacture of Gluwanis B) Rosin modified 7 enol resin (Weight average molecule [90,000) Polymerized linseed oil No. 4 "O Tsuru H" "Guiaren 168" “Offtope AIJ Other than the above ingredients, Thus, Gluwanis B was obtained.

Example 1 42.0 parts by weight 20.0 parts by weight 20.0 parts by weight 17.0 parts by weight 1,011: part Do the same thing as (manufacture of ink B) “First Dan Glue TGRJ Gurwanis B "Guiaren 168" Using the above raw materials, Ink B was obtained.

Comparative example 2 (Manufacture of Ruwanis C) 14.0 parts by weight 75.0 parts by weight 11.0 parts by weight or three rolls. Rosin modified phenolic resin (Weight average molecular weight 50,000) Polymerized linseed oil No. 4 "0 Tsuru H" "Guiaren 168" “Off Tope All Example 1 except that the above raw materials were used Thus, Gluwanis C was obtained.

(Manufacture of ink C) "Fastgun Blue TGRJ Gluwanis C "Guiarene 168" 42.011c parts 20, Og amount negative part 0.0 parts by weight 16.5 parts by weight Same as 1.5 parts by weight X 4.0 iit parts 75.0 parts by weight 11.0 parts by weight of the above raw materials were mixed together and kneaded using a three-roll mill in a conventional manner to form an ink composition.

Comparative Example 3 (Production of Gluwanis D) Rosin-modified phenolic resin (weight average molecular weight 140,000) Polymerized linseed oil No. 4 "No. 3 Solvent" (Nippon Oil Co., Ltd. petroleum solvent for split ink) 42, OMtk
20.0 parts by weight 20.0 parts by weight Guiarene 168J 16.5 parts by weight Octo! All 1.
An r-ruvarnish Dt was obtained in the same manner as in Example 1 except for using 5 parts by weight of the above raw materials.

(Manufacture of Ink D) "First Dan Blue TGR414.0 parts by weight r
Lua=su I) so, oi
Quantity part Negative part Allen 168J 6
．． 0 parts by weight The above raw materials were kneaded using a three-roll method in a conventional manner to obtain ink Dt.

(Ink evaluation) Inks A and B obtained in Example 1 and Comparative Examples 1 to 3.

Using C and Dt-, all evaluations were carried out according to the following method, and the results are shown in Table 1. A waterless lithographic plate with a non-printing area made of Jim was attached, and printing was performed using each ink while raising the temperature of the plate surface without supplying dampening water, and scumming occurred on the printed matter at a certain solid density. The temperature of the plate surface at which gold staining occurs is determined by the temperature. Ink with a high background smudge generation temperature is less likely to cause background smudge, even in practical printing.

[Fluidity and tackiness of ink] The fluidity (DM) of each ink was measured at 25°C using a Sugered meter, and the tackiness (TV) of each ink was measured at 32°C.

[Printing suitability test] Next, for each of these inks! Printing was performed using a Ru7Baku printing aptitude tester to determine whether paper blisters or paper breakage occurred.

1. From these results, it can be seen that ink A of the present invention has a high scumming temperature and does not cause paper breakage or paper breakage. Rosin-modified phenol with a weight average molecular weight of 90,000
Ink B using ar has high tack, causes paper swelling and paper breakage, and is not suitable for rotary printing, and has a weight average molecular weight of 5.
Ink C, which uses a rosin-modified phenolic resin, has a low tack, but the temperature at which scumming occurs is low, and is not suitable for rotary printing. Ink D, which uses a highly soluble solvent system, is As with B, it can be seen that the tack is high, and paper smearing and paper breakage occur, making it unsuitable for rotary printing.

Thus, it can be seen that the waterless lithographic ink of the present invention has excellent background stain resistance and excellent suitability for rotary printing.

〔Effect of the invention〕

The ink of the present invention is useful as an ink for waterless lithographic rotary presses because it has good stain resistance and does not cause paper blisters or paper breakage.

Claims (1)

[Scope of Claims] 1. A waterless planographic plate characterized by containing (1) a rosin-modified phenolic resin having a weight average molecular weight of 110,000 or more, (2) normal paraffin, and (3) an α-olefin solvent. Ink for rotary presses. 2. Contains (1) a rosin-modified phenolic resin with a weight average molecular weight of 110,000 or more, and (2) a mixed solvent consisting of (a) a petroleum solvent containing normal paraffin as a main component and (b) an α-olefin solvent. An ink for a waterless lithographic printing press characterized by containing a varnish that 3. The weight average molecular weight of the rosin-modified phenolic resin is 11.
The ink for a waterless lithographic rotary press according to claim 1 or 2, which has a molecular weight in the range of 0,000 to 250,000. 4. The ink for a waterless lithographic rotary press according to claim 1, wherein the content of the rosin-modified phenolic resin is in the range of 5 to 40% by weight. 5. The content of rosin-modified phenolic resin is 2 in the varnish.
The ink composition for a waterless lithographic rotary press according to claim 2, wherein the ink composition is in the range of 0 to 50% by weight. 6. The ink for a waterless lithographic rotary press according to claim 1 or 2, which uses normal paraffin having a boiling point of 200° C. or higher. 7. The ink for a waterless lithographic rotary press according to claim 2, wherein the content of normal paraffin is 98% by weight or more of the petroleum solvent. 8. The ink for a waterless lithographic rotary press according to claim 1 or 2, which uses an α-olefin solvent having a boiling point of 200° C. or higher. 9. The waterless lithographic plate according to claim 2, wherein the mixing ratio of (a) a petroleum solvent containing normal paraffin as a main component and (b) an α-olefin solvent is in the range of 10:90 to 90:10 by weight. Ink for rotary presses. 10. The waterless lithographic plate according to claim 2, wherein the content of the mixed solvent consisting of (a) a petroleum solvent mainly composed of normal paraffin and (b) an α-olefin solvent is in the range of 20 to 50% by weight of the varnish. Ink for rotary presses. 11. The ink for a waterless lithographic rotary press according to claim 2, wherein the varnish content is in the range of 35 to 75% by weight.