EP0126773A1 - Concentres de solutions lithographiques de mouillage a base d'eau - Google Patents

Concentres de solutions lithographiques de mouillage a base d'eau

Info

Publication number
EP0126773A1
EP0126773A1 EP84900335A EP84900335A EP0126773A1 EP 0126773 A1 EP0126773 A1 EP 0126773A1 EP 84900335 A EP84900335 A EP 84900335A EP 84900335 A EP84900335 A EP 84900335A EP 0126773 A1 EP0126773 A1 EP 0126773A1
Authority
EP
European Patent Office
Prior art keywords
fountain solution
concentrate
water
buffer
fountain
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP84900335A
Other languages
German (de)
English (en)
Inventor
Bernard Thiebaut
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF Corp
Original Assignee
BASF Corp
Inmont Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF Corp, Inmont Corp filed Critical BASF Corp
Publication of EP0126773A1 publication Critical patent/EP0126773A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/08—Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development

Definitions

  • This invention relates to water based concentrates which are mixed with water to form lithographic fountain solutions.
  • the web offset and lithographic printing processes employ planographic plates which transfer ink to a blanket roll which, in turn, then transfers the ink to a substrate thereby forming the printed images.
  • the plates are referred to as planographic since the image and non-image areas are in the same plane.
  • the plates are constructed so that with proper treatment the image areas are hydrophobic and oleophilic and thereby receptive to inks.
  • the non-image areas are hydrophilic and are water receptive.
  • the water based fountain solution can be applied to the plate with a separate roll prior to inking, or, the ink and fountain solution can be applied simultaneously as in the Dahlgren type of system.
  • plain tap water can be used as a fountain solution
  • additional ingredients in combination with water as a fountain
  • OMH_ *N T O solution in order to improve the printing characteristics. It is known to include low boiling point alcohols, such as isopropanol and ethanol, and various surfactants to reduce surface tension and permit better wetting of the plates. It is also known to include an acid or a buffer to achieve a pH range of 4.0 - 6.0. Polyols such as glycerine are introduced into a fountain solution to act as a humectant and lubricant, and to assist in maintaining a thin layer of water on the hydrophilic areas of the plate. Biocides such as bactericides and algicides are added to control microbiological growth in the fountain solution.
  • fountain solutions are prepared at the printing site by mixing fountain concentrates with tap water.
  • a typical fountain solution known in the art contains ethyl alcohol or isopropyl alcohol, glycerine, surfactant, bactericide or algicide, various amounts of an acidifying agent such as phosphoric acid, and water.
  • U.S. Patent 4,247,328 to Lawson et al discloses lithographic fountain concentrates containing a desensitizing material.
  • the preferred desensitizing materials disclosed are salts of acids such as citric acid, phosphoric acid, tartaric acid and EDTA. Lawson states that although acids can be used as a desensitizer, salts are preferred since they act as buffers to overcome the use of acidic or alkaline tap waters. Lawson requires the use of at least 50% organic solvent in the fountain solution concentrate.
  • Patent 4,150,996 discloses a fountain solution concentrate containing sulfanilic acid, formaldehyde, sodium hydroxide, and gum arabic. Gum arabic has been found to have numerous negative effects including gumming and glazing of plates and rollers and promotion of the growth of bacteria and algae.
  • U.S. Patent 4,278,467 to Fadner discloses a fountain solution which contains a substitutive replacement for isopropyl alcohol.
  • U.S. Patent 4,116,896 to Garret et al discloses a fountain solution whereby detrimental precipitation is controlled in acidic alcohol/water fountain solutions by the use of a chelating agent.
  • a fountain solution concentrate having a strong buffer formed by reacting a polycarboxylic acid with an organic base and mixing about 1.0 wt.% to 6.0 wt.% of said concentrate with water, a fountain solution
  • OMPI exhibiting a superior buffering effect and containing no alcohol or extremely small qualtities of alcohol is obtained.
  • the resultant fountain solution formed from a concentrate when used with a lithographic printing press results in the following unexpected and surprising improvements: longer press run, decreased scumming, decreased ink/water emulsification, decreased linting and difibration, decreased substrate breakage, improved drying, decreased strike-in, and improved ink/water balance.
  • This invention relates to concentrates for use in lithographic fountain solutions.
  • the concentrates are a blend of a buffer, a polyol, water, and an alcohol.
  • the concentrates used on lithographic presses using a Dahlgren dampening system do not contain alcohol.
  • the concentrates of this invention can additionally contain a bactericide or algicide, and surfactants.
  • the concentrate is blended with tap water to form a fountain solution such that the concentrate comprises 1% to 6% of the fountain solution.
  • the buffers used in this invention are the salts of polycarboxylic acids and organic bases (amines).
  • the polycarboxylic acids have a pK a between 3 and 6 while the bases must have a pKt ⁇ between 2 and 9.
  • the polycarboxylic acids may have at least one hydroxyl group.
  • the present invention is directed to a water base concentrate for use in lithographic fountain solutions, wherein said concentrate is mixed in an amount of about 1.0 wt.% to 6.0 wt.% with water to form a fountain
  • OMPI solution said fountain solution concentrate characterized by: water; a buffer salt, comprising the salt of polycarboxylic acid having a pK a between 3 and
  • said fountain solution made by mixing the concentrate with water, has a pH between about 4.7 and about 5.3, a surface tension between about 32 x 10"" 3
  • the surface tension is adjusted according to the type of dampening system. For classic dampening systems (water based systems) the surface tension will be selected preferably between about 44 and 52 x 10"" 3 Newton/m. For alcohol dampening systems, the surface tension will be preferably between about 32 and 37 x 10 ⁇ 3 Newton/m; in this case, by selecting the proper fountain additive, it will be possible to decrease or suppress the alcohol usually used in that dampening system.
  • the surface tension could be adjusted by adding a non-foaming surfactant, a sufficient buffer strength so that the pH variation is less than 1 unit when 5 cc of decinormal (0.1N) HC1 or 5 cc of (0.1N)Na0H is added to 100 cc of the fountain solution.
  • the concentrate of this invention is blended with water to comprise 1% to 6% of the fountain solution.
  • the resulting fountain solution has a pH between about 4.7 and about 5.3 and a surface tension between about 32 and 52 x 00"" 3 Newton/m.
  • the fountain solution made with this invention will have a buffering effect such that the pH vartiation will be less than one pH unit if either a strong base or a strong acid is added to the solution.
  • the pH variation will be less than one unit.
  • Carboxylic acids which can be used to form the buffer salts of this invention are citric acid, malic, glutaric, succinic, azelaic acid and similar polyacids which have a pK a between about 3 and about 6.
  • the polyacids used to form the buffer salts may have other functional groups, such as hydroxyl groups.
  • the organic bases contemplated by this invention are the amines including primary, secondary and tertiary amines, polyamines such as hydrazine and
  • OMPI ethylenediamine ethylenediamine
  • cyclic amines cyclic amines and aminoalcohols.
  • These amines will have a pKj ⁇ between about 2 and about 9 and preferably between 3 and 6.
  • a particularly useful buffer is the salt of citric acid and dimethylamine.
  • the pK a of a polycarboxylic acid - amine salt solution will vary in accordance with the number of acid groups which are neutralized on the polycarboxylic acid molecule by the organic base. It is preferred, according to my invention, to obtain buffer salts wherein a sufficient number of acid groups on the polycarboxylic acid molecule are unreacted in order to obtain the desired pH range of the fountain solution.
  • the fountain solution may contain, in addition to the above-described buffer, an hygroscopic product and an alcohol which homogeneize the different ingredients, additives such as a bactericide or an algicide, and detergents such as N-methyl pyrrolidone or various surfactants.
  • the hygroscopic product may be glycerine or an equivalent polyol such as a polysaccharide or one of its derivatives (for example carboxymethylcellulose) or a vinylpyrrolidone polymer, or a colloidal silicic acid; it is used to maintain the quantity of water deposited on the plate and on the blanket.
  • the water film thickness on the planographic plate is very thin due to the low surface tension of the fountain solutions of the invention. Consequently, the use of fountain solution is decreased during a typical press run.
  • Another important technical consequence of the minimal amounts of water required by use of my invention is the faster drying of the prints.
  • the bactericide and/or algicide used in the concentrate of this invention may be any such commercially available products.
  • biocide refers to a bactericide, an algicide, or a combination thereof.
  • a particularly useful and preferred embodiment of my invention is a concentrate for use in lithographic fountain solutions, wherein the concentrate is mixed in an amount of about 6 wt.% with water to form a fountain solution having a pH between 4.7 and 5.3, a surface tension between 32 and 52 x 10"" 3 Newton/m and sufficient buffer strength so that the pH variation is less than 1 unit when strong acids or bases are added to the solution, comprising: 58.7 wt.% water - 20.5 wt.% of a buffer salt solution comprising the salt of citric acid and dimethylamine
  • the fountain solutions prepared from the concentrates of my invention when used with lithographic printing presses have demonstrated numerous beneficial results which are both unexpected and surprising including accelerated drying time, decreased linting, improved rub resistance, decreased use of fountain solution and decreased use of alcohol. Although the reasons for the unexpected results are not clear, the interactions of the fountain solution with the inks, the paper substrates, and the surface of the planographic plates are in my opinion
  • fountain solutions typically contain up to 15 wt.% low molecular weight alcohols
  • the use of alcohol in the fountain solutions prepared with the concentrates of my invention are miniscule (.04 wt.% - 1.2 wt.%) and in the case of Dahlgren systems, can be eliminated, or substantially decreased.
  • the concentrations of buffer salts in the fountain solution concentrates of this invention range from about 7.0 wt.% to about 35.0 wt.%.
  • concentrations of buffer salts in the fountain solutions of this invention range from about .07 wt.% to about 2.1 wt.%. It is contemplated that, in order to obtain the required buffering effect, individual buffer salts, combinations of buffer salts, or combinations of buffer salts and acids may be used to prepare the fountain solution concentrates of this invention.
  • the concentrates as prepared in accordance with formulation A and B were mixed with water in a proportion of 1 to 6 parts of concentrate to 100 parts of water to form fountain solutions.
  • the concentrates as prepared in accordance with formulation C and D were mixed with water in a proportion of 1 to 6 parts of concentrate to 100 parts of water to form fountain solutions.

Landscapes

  • Printing Plates And Materials Therefor (AREA)
  • Detergent Compositions (AREA)

Abstract

Concentrés de solutions lithographiques de mouillage qui sont combinés avec de l'eau pour donner des solutions de mouillage améliorées. Les concentrés contiennent des quantités spécifiques de produits stabilisateurs, ce qui résulte en une amélioration des caractéristiques du procédé d'impression. Les produits stabilisateurs sont les sels d'acides polycarboxyliques et de base organique comme les amines. On élimine, ou on réduit sensiblement le besoin d'utiliser de l'alcool dans les solutions de mouillage.
EP84900335A 1982-11-26 1983-11-18 Concentres de solutions lithographiques de mouillage a base d'eau Withdrawn EP0126773A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8219911 1982-11-26
FR8219911A FR2536675A1 (fr) 1982-11-26 1982-11-26 Compositions pour eau de mouillage des plaques offset

Publications (1)

Publication Number Publication Date
EP0126773A1 true EP0126773A1 (fr) 1984-12-05

Family

ID=9279581

Family Applications (2)

Application Number Title Priority Date Filing Date
EP84900335A Withdrawn EP0126773A1 (fr) 1982-11-26 1983-11-18 Concentres de solutions lithographiques de mouillage a base d'eau
EP83402270A Withdrawn EP0112745A1 (fr) 1982-11-26 1983-11-24 Compositions pour eau de mouillage des plaques offset

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP83402270A Withdrawn EP0112745A1 (fr) 1982-11-26 1983-11-24 Compositions pour eau de mouillage des plaques offset

Country Status (8)

Country Link
EP (2) EP0126773A1 (fr)
JP (1) JPS59502097A (fr)
AU (1) AU576748B2 (fr)
CA (1) CA1251881A (fr)
DK (1) DK541683A (fr)
FR (1) FR2536675A1 (fr)
MX (1) MX161896A (fr)
WO (1) WO1984002142A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4859247A (en) * 1987-11-02 1989-08-22 Basf Corporation Low viscosity, highly concentrated pigment dispersions and method of making same
US4822419A (en) * 1987-11-09 1989-04-18 Basf Corporation Lithographic ink composition and process for making same
IT1266557B1 (it) * 1993-07-21 1997-01-09 Arturo Guerini Procedimento e apparecchiatura di trattamento del liquido di bagnatura in macchine da stampa, particolarmente per macchine da
EP0667243A1 (fr) * 1994-02-15 1995-08-16 Saito, Toshiki, c/o Toshiki Saito Design Room Procédé d'impression offset et des impression fines à haute densité réalisés par ce procédé
AU2949999A (en) * 1998-03-31 1999-10-18 B/M Management Cc Printing solution for lithographic printing
JP5805149B2 (ja) * 2012-07-17 2015-11-04 東京インキ株式会社 平版印刷方法および湿し水濃縮組成物

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3083149A (en) * 1959-10-12 1963-03-26 Universal Oil Prod Co Method of masking a surface with a salt of a carboxylic acid and an aminoalkane prior to dyeing
US3398002A (en) * 1967-06-29 1968-08-20 Bondurant Universal fountain solution for planographic printing
GB1441588A (en) * 1972-10-04 1976-07-07 Unilever Ltd Rinse composition
PL91463B1 (fr) * 1974-08-23 1977-02-28
GB1602823A (en) * 1978-01-18 1981-11-18 Vickers Ltd Lithographic printing
JPS55115045A (en) * 1979-02-27 1980-09-04 Fuji Photo Film Co Ltd Printing plate preparation
JPH0237316B2 (ja) * 1981-02-25 1990-08-23 Seisan Kaihatsu Kagaku Kenkyusho Insatsuhanyokibanoyobiinsatsuhan

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8402142A1 *

Also Published As

Publication number Publication date
FR2536675A1 (fr) 1984-06-01
WO1984002142A1 (fr) 1984-06-07
AU2412284A (en) 1984-06-18
DK541683A (da) 1984-05-27
DK541683D0 (da) 1983-11-25
AU576748B2 (en) 1988-09-08
CA1251881A (fr) 1989-03-28
JPS59502097A (ja) 1984-12-20
EP0112745A1 (fr) 1984-07-04
MX161896A (es) 1991-02-28

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Inventor name: THIEBAUT, BERNARD