CS239888B1 - Printing ink for line gravure printing - Google Patents

Abstract

Printing ink for intaglio printing, fast-drying and, after drying, highly resistant to abrasion and chemical agents, easily wipeable when wet with an aqueous solution of diluted hydroxide and sulfonated castor oil, which contains 9 to 18 wt. of hard resin, formed by condensation of rosin with phenolic resin, with a net acidity of 90 to 150 mg KOH/g and a softening temperature of 125 to 175 °C, as well as a hydrocarbon solvent, a drying or semi-drying alkyd, a drying oil, a surfactant, pigments or powder substrates and metal soaps.

Description

(54)

Linear gravure ink, drying quickly and after drying with high resistance to abrasion and chemical agents, easily wiped in the wet state with an aqueous solution of dilute hydroxide and sulphonated castor oil containing from 9 to 18% by weight. hard resins formed by the condensation of colophony with a fanolic resin having a pure acidity of 90 to 150 mg KOH / g and a softening point of 125 to 175 ° C, and a hydrocarbon solvent, drying or semi-drying alkyd, drying oil, surfactant, pigments or powder substrates; metal soaps.

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239 888

The object of the invention is a printing ink for line gravure printing which is water-wiping and thus suitable for printing on machines provided with a device for wiping off excess ink with the surface of the printing plate rotating with a scraper roller.

Line gravure printing is a technique used mainly for the production of banknotes, stamps and other valuables »Gravure printing is characterized by the fact that all color must be wiped off the surface of the printing plate before printing» The printing areas are recessed below the surface of the plate » for printing banknotes, stamps and the like, considerable demands are placed. These are primarily the speed of drying on the press, fastness to light and the resistance of the dried paint film to various chemical agents and abrasion®. These requirements also correspond to the composition of the components »It is used drying oils and alkyd resin solutions modified with drying oils in kerosene or kerosene fractions» a certain amount of hard resin based on rosin modified with esterified with glycerine or pentaerythrite, with a softening temperature of 130 to 160 ° C and an acid number of max. 30 mg KOH / g, is also added to strengthen the color film.

The formulated inks for line gravure printing (i.e. copper-based inks) are characterized by relatively high stiffness and shortness. Therefore, the ink from the surface of the printing plate on a rotating printing cylinder cannot be wiped off only by a blade. special papers. Today, a counter-rotating squeegee roller is used to clean the non-printing surface of the printing plate. However, this wiped paint adhering to the surface of the scraper roller must be removed immediately. Otherwise, it would be transferred back to the printing plate at the next turn and thus undesirably interfere with the results of the printing process®

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It is known that by adding the emulsifying agents Si to the paints used up to now, these paints can be wiped off with water, but the effective amount of these additives is 10 to 25% by weight. on color. This greatly worsens drying on the print and reduces resistance to abrasion and chemical agents.

It has also been found that using hard resin based on modified rosin or dimeric rosin rosins having an acid number of 140-210 mg KOH / g and a softening point of 110-200 ° C, inks that satisfy wet smear conditions can be prepared that dry well. The required content of such a resin is at least 8% by weight. on color. However, this amount of resin with such a high acid number leads to a considerable deterioration in the resistance of the dried ink film to chemical agents, such as solutions of alkali hydroxides, sodium carbonate, hydrogen peroxide and organic solvents. This prevents the use of such ink for printing banknotes, securities and stamps and other valuables where high resistance not only to abrasion but also to chemical agents is required.

It has now been found that it is possible to prepare an ink for high-abrasion liner gravure and chemical agents comprising a hard resin based on the reaction product of rosin and phenolic resin, alkyd resin, solvents and pigments, the color comprising 9 to 18% by weight . % of hard resins formed by condensation of 55 to 70 wt. rosin and 45 to 30 wt. % phenolic resins based on p-tert-butylphenol and formaldehyde, having an acid number of 90 to 130 mg KOH / g and a softening point of 125 to 175 ° C; % hydrocarbon solvent having a bond temperature of 180 to 33 ° C, 4 to 12 wt. % of an alkyd modified with 50 to 80 wt.% of a drying or semi-drying oil, having an acid number of max. 30 mg KOH / g, 4 to 16 wt. % of a drying or semi-drying oil, 3 to 7 wt. % surfactant based on ethylene oxide compounds, 40 to 65 wt. % of pigment and / or powdered substrates and 0.01 to 1 wt. metal soap ·

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The following examples illustrate the invention.

rosin and 30% by weight of resol, having an acid number of 128 mg KOH / g and a softening point of 126,5 ° C)

Naphtha (21O-23O ° C) Isophthalic alkyd (modifo 72% dry) Wood oil

Ethylene oxide adduct to castor oil

Titanium white

Versálovó modř

Soot

Chalk float

Blanc-fix

Cobalt naphthenate solution (20% w / w)

Example 2

Hard resin (prepared by condensation of 55% rosin and 45% resol, with an acid number of 93 mg KOH / g and a softening point of 174,5 ° C)

Diesel fractions (boiling point 280-310 ° 0) Pentaerythritic alkyd (modif · 56% oil dry)

Dehydrated castor oil

Ethylene oxide adduct to alkylphenol

Cromophtalbordo RS

Soot

Chalk float

Blanc-fix

Cobalt naphthenate (20% by weight)

16.50% by weight

8.50% w / w 10.90 wt.

8.60% wt.

3.50% wt. 8.00% Mass ·

12.40 wt. 0.25% by weight ·

10.00 wt. 21.00 wt. 0.35% by weight ·

9.75 wt% · 17.50 wt% ·

4.90% by weight ·

13.20% 6.80 wt.

15.20% wt. 0.20% wt.

12.00% by weight 20.00% by weight ·

0.45% by weight ·

Example 3

Hard resin (prepared by condensation 63% rosin and 37% resol, with an acid number

111 mg KOH and softening point 148 ° C) 12.60 Naphtha (boiling point 24 ° -27 ° C) 10.50 Pentaerythritic alkyd (modife 65% dry oil) 7.40 Wood oil 5.00 Dehydrated ricine oil 5.20 Ethylene oxide adduct for castor oil 5,10 Permanent Carmin FBB 17,70 Float chalk 11,00 Blanc fix 25,10 Cobalt naphthenate solution (20% w / w) 0.40

Example 4

Hard resin (prepared by condensation of 59% by weight of rosin and 41% by weight of resol, with an acid number

103 mg KOH / g and softening point 155 ° C) 17,55 Naphtha (boiling point 260 ~ 290 ° C) 19,54 Isophthalic alkyd (modified 60% oil-dry) 4,00 Wood oil 7,50 Lehydrate-castor oil 8.30 Ethylene oxide adduct to alkylphenol 3.00 Permanentgelb HR 12.50 Chalk float 8.60 Blanc fix 19.00 Cobalt naphthenate (solid) 0.01

239 888% by weight ·% by weight ·% by weight ·% by weight% by weight% by weight % wt. % wt.

% wt. % wt% wt% wt% wt% wt% wt. % by weight ·% by weight% by weight % by weight

Example 5

Hard resin (prepared by condensation of 66% by weight)

239 888 rosin and 44 wt. Resol, with an acid number of 12 µg KOH / g and a softening point of 135 ° C) 9.04

Naphtha (boiling point 24 ° -27 ° C) 5.05

Isophthalic alkyd (modified 72% dry oil) 11.90 Dehydrated castor oil 4,10

Ethylene oxide adduct to alkylphenol 6.90

Versal blue 19,00

Chalk floated 15,00

Blanc-fix $ 28.1

Cobalt naphthenate, 0.02

Manganese naphthenate 0,40

Lead naphthenate 0.43% wt. % wt. % wt. % wt. % wt. % wt. % wt. % wt. % wt. % wt. % wt.

The printing inks of Example 1 to 5 were readily washed wet with the coating roll surface with an aqueous solution containing 0.5 to 3 wt. % alkali hydroxide and 0.3 to 2 wt. sulfonated castor oil, dried well and dried proofs were resistant to abrasion and various chemical agents.

Claims (1)

OBJECT OF THE INVENTION 239 888 High-wear liner gravure and chemical reagent ink comprising a hard resin based on the reaction product of rosin and phenolic resin, alkyd resin, solvents and pigments, characterized in that it consists of 9 to 18 wt. % of hard resins formed by condensation of 55 to 70 wt. rosin and 45 to 30 wt. % phenolic resins based on p-tert-butylphenol and formaldehyde, having an acid number of 90 to 130 mg KOH / g and a softening point of 125 to 175 ° C; % hydrocarbon solvent, boiling point 180 DEG-330 DEG C., 4-12 wt. % of alkyd modified 50 to 80 wt. of a drying or semi-drying oil having an acid number of ¹ to 30 mg KOH / g, 4 to 16% by weight of a drying or semi-drying oil, 3 to 7 wt. % surfactant based on ethylene oxide compounds, 40 to 65 wt.% pigment and / or powdered substrates; and 0.01 to 1 wt. metal soap. Printed by the Moravian Printing Works, operation 12, cl. People Militia 3, Olomouc Price: 2,40 Kčs