US2515536A - Planographic repellent solution and method of preparing the same - Google Patents
Planographic repellent solution and method of preparing the same Download PDFInfo
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- US2515536A US2515536A US659870A US65987046A US2515536A US 2515536 A US2515536 A US 2515536A US 659870 A US659870 A US 659870A US 65987046 A US65987046 A US 65987046A US 2515536 A US2515536 A US 2515536A
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- solution
- repellent
- water
- glycerine
- per cent
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- 239000005871 repellent Substances 0.000 title claims description 74
- 230000002940 repellent Effects 0.000 title claims description 73
- 238000000034 method Methods 0.000 title description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 54
- 235000011187 glycerol Nutrition 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 23
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 8
- XLYOFNOQVPJJNP-PWCQTSIFSA-N Tritiated water Chemical compound [3H]O[3H] XLYOFNOQVPJJNP-PWCQTSIFSA-N 0.000 claims 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 37
- 239000000976 ink Substances 0.000 description 19
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 18
- CMDGQTVYVAKDNA-UHFFFAOYSA-N propane-1,2,3-triol;hydrate Chemical compound O.OCC(O)CO CMDGQTVYVAKDNA-UHFFFAOYSA-N 0.000 description 13
- 150000001299 aldehydes Chemical class 0.000 description 9
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 9
- 239000002250 absorbent Substances 0.000 description 8
- 239000000839 emulsion Substances 0.000 description 7
- 239000004615 ingredient Substances 0.000 description 4
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 description 3
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical compound O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241000233866 Fungi Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000008098 formaldehyde solution Substances 0.000 description 1
- 229940015043 glyoxal Drugs 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000003230 hygroscopic agent Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000006012 monoammonium phosphate Substances 0.000 description 1
- 235000019837 monoammonium phosphate Nutrition 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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 a so-called repellent solution for use upon planographic printing plates including parchment or like cellulose base and metal planographic printing plates, and to a method of making the said solution.
- the general uses and functions or purposes of such solutions are well-known in the art and are disclosed, for example, in United States Letters Patents Nos. 1,977,646, 2,003,268 and 2,393,875, to which reference may be had for a disclosure of the general nature and purposes of such solutions.
- repellent fountain solution in addition to serving as a dampening or repellent solution, per se, keeps the planographic printing plate moist and prevents it from scumming up when the machine is stopped temporarily during the printing of long runs or editions.
- the repellent solution of the present invention is particularly adapted for use as a fountain solution in rotary offset planographie duplicating apparatus.
- planographic repellent solutions a hygroscopic agent which has commonly been glycerine and it has been customary to put such solutions in concentrated form in bottles or like containers and dilute them prior to use. This, of course, necessitates the additional diluting operation and usually requires the use of distilled water since ordinary tap water is generally not suitable for the purpose of diluting such repellent solutions. 1
- a number of difilculties have been encountered heretofore in'attempts to use planographic repellent solutions of low water content and among these have been the glazing of the ink rolls embodied in rotary oii'set planographic duplicating apparatus.
- Prior glycerine-water repellent solutions have usually been somewhat acid in nature and, as pointed out hereinbefore, cause objectionable stretching or expansion of water-absorbent and water-expanslble planographic printing plates moistened thereby including parchment plates and the like.
- the water content of a glycerine-water repellent solution may be maintained relatively high in relation to the glycerine content, and the glycerine content of the solution correspondingly low, without causing objectionable stretching or expansion of the water-absorbent and water-expansible planograph printing plates moistened by the solution if the solution is rendered somewhat more acid and its pH established and controlled in a manner which will be described presently. So to do is a primary object of the present invention.
- Related objects of the present invention are to provide a new and improved low water content glycerine-water repellent solution which when used as a fountain solution in conjunction with water-absorbent and water-expansible planographic printing plates, including parchment plates, prevents the objectionable spreading or stretching of such plates incidental to the use of prior glycerine-water planographic repellent fountain solutions.
- Another object of the present invention is to provide a novel method of making the new repellent solution and of assuring that the same has the desired controlled pH value.
- a repellent fountain solution is afforded which materially reduces the expansion or stretching of parchment and like water-absorbent and waterexpansible planographic printing plates moistened thereby while, at the same time, the new repellent fountain solution materially reduces the tendency of such glycerine-water fountain repellent solutions to form an emulsion of the oil-in-water type with fatty or greasy lithographic inks and hence correspondingly reduces the tendency of such solutions to cause glazing of the ink rolls in rotary planographic duplicating presses with which such repellent fountain solutions are used.
- the rate of expansion of parchment and like water-absorbent and water-expansible planographic printing plates moistened thereby is materially less than the rate of expansion in similar plates moistened with prior low glycerine content and high water content repellent fountain solutions and that the total expansion or stretch in similar plates moistened with the prior low glycerine content high water content repellent fountain solutions.
- the tendency of the repellent fountain solution to form an oil-in-water type emulsion with fatty or greasy lithographic inks and resulting glazing of the ink rolls may be materially reduced by the addition of a preselected quantity of formaldehyde or other watersoluble aldehyde to the solution.
- the formaldehyde or other water-soluble aldehyde makes it possible to utilize a relatively high glycerine content in the new repellent fountain solutionwithout causing glazing of the ink rolls in the presses with which the new repellent solution is used while, at the same time, the reduction of the pH of the solution to a pH of not substantially in excess of 4.0 makes it possible to employ a relatively high water content in the new repellent solution while materially reducing both the rate of expansion and the total expansion or stretch of parchment and like waterabsorbent and water-expansible planographic printing plates moistened thereby.
- Formaldehyde 37 per cent solution in water
- Formin 0.5
- the glycerine content of the glycerine-water repellent fountain solution set forth in the foregoing Example No. 1 is approximately sixty per cent by weight of the entire composition or complete solution.
- the mono-ammonium dihydrogen phosphate and the aqueous formaldehyde solution are first preferably thoroughly mixed together, and the glycerine and water are then added to and thoroughly mixed with the solution thus formed.
- the pH of the solutiondrops in the presence of the formaldehyde comes to an equilibrium in a signiflcantly shorter time than would otherwise be required to bring the pH of the solution to equilibrium if the formaldehyde were added last.
- the quantity of phosphoric acid indicated in the foregoing Example No. 1 may then be added to the solution so as to reduce and adjust the pH of the thus completed and resulting solution to a value of approximately 3.0.
- the mono-ammonium phosphate serves as a buffer to maintain the pH of the solution at a value of approximately 3.0, to which pH the solution is reduced by the addition of phosphoric acid.
- the formaldehyde component of the new repellent solution serves to prevent the new repellent solution from forming an oil-in-water type of emulsion with fatty or greasy lithographic inks and consequent glazing of the ink rolls of the planographic printing presses with which the new repellent solution may be used. At the same time the formaldehyde component of the solution prevents the formation of fungus mold growth in the solution.
- the quantity of formaldehyde incorporated into the solution should be within a critical range of not substantially less than 0.1 per cent nor substantially more than 2.0 per cent of the complete composition, by weight, the formaldehyde being calculated as HCHO, or equivalent amounts of other water-soluble aldehydes.
- the quantity of formaldehyde, or other water-soluble aldehyde, employed in the new repellent solution may be varied somewhat between the critical limits specified depending, in part, upon the glycerine content of the solution, being greater for a higher glycerine content and less for a lower gb'cerine content.
- Furfuraldehyde (Furfural) Mono-ammonium di-hydrogen phosphate Plus sufficient phosphoric acid (HaPOt) to reduce the pH of the solution to between 3.0 and 4.0.
- Formaldehyde 37 per cent solution in water
- Formin 0.5
- the present invention provides a a new and improved low water content planographic dampening or so-called repellent fountain solution, and a novel method of preparing the same, and that the present invention thus has the desirable advantages and characteristics, and accomplishes its intended objects, including those hereinbefore pointed out and others which are inherent in the invention.
- a planographic repellent composition comprising a solution or water, glycerine, monoammonium dihydrogen phosphate and formaldehyde, the said water component of the said planographic repellent composition constituting not substantially more than eighty per cent 01' the complete repellent composition and the aid glycerine component of the said repellent composition constituting not substantially less than twenty per cent nor substantially more than eighty per cent oi the complete repellent composition, by weight, the said formaldehyde component of the said repellent composition constituting not substantiallyless than 0.1 per cent nor substantially more than 2.0 per cent of the complete repellent composition, by weight, and being calculated as 100 per cent formaldehyde, and the said repellent composition having a pH oi not substantially more than 4.0 nor substantially less than 3.0.
- a planographic repellent composition comprising a solution 01 water, glycerine, monoammonium dihydrogen phosphate (NHOH: (P04) and a water-soluble aldehyde, the said water plete repellent composition, by weight, the said water-soluble aldehyde component of the said repellent composition constituting not substantially less than 0.1 per cent nor substantially more than 2.0 per cent 0! the complete repellent composition, by weight, and being calculated as 100 per cent water-soluble aldehyde, and the said repellent composition having a pH oi. not substantially more than 4.0 nor substantially less than 3.0.
- a planographic repellent composition as deiined in claim 1 which contains, in addition to the ingredients therein specified, a minor proportion of phosphoric acid (HaPOr).
- a planographic repellent composition as defined in claim 2 which contains, in addition to the ingredients therein specified, a minor proportion of phosphoric acid (HaPOO CHARLES H. VAN DUSEN, Ja.
Description
Patented July 18, 1950 PLAN OGRAPHIC REPELLENT SOLUTION AND METHOD OF PREPARING THE SAME Charles H. Van Dusen, Jr., Willoughby, Ohio, assignor to Addressograph-Multigraph Corporation, Wilmington, DeL, a corporation of Delaware No Drawing. Application April 5, 1946,
Serial No. 659,870
4 Claims. (Cl. 101-1492) This invention relates to a so-called repellent solution for use upon planographic printing plates including parchment or like cellulose base and metal planographic printing plates, and to a method of making the said solution. The general uses and functions or purposes of such solutions are well-known in the art and are disclosed, for example, in United States Letters Patents Nos. 1,977,646, 2,003,268 and 2,393,875, to which reference may be had for a disclosure of the general nature and purposes of such solutions. In general it may be said, however, that such solutions are of the two types, namely, those which are applied directly to the plates as etching solutions at the start of a planographic printing operation to render the non-printing areas of the plate repellent to greasy or fatty acid-containing planographic printing inks and those which are employed for the same purpose as so-called fountain repellent solutions upon rotary offset planographic duplicating machines. In the latter instance the repellent fountain solution in addition to serving as a dampening or repellent solution, per se, keeps the planographic printing plate moist and prevents it from scumming up when the machine is stopped temporarily during the printing of long runs or editions. The repellent solution of the present invention is particularly adapted for use as a fountain solution in rotary offset planographie duplicating apparatus.
It is customary to include in such planographic repellent solutions a hygroscopic agent which has commonly been glycerine and it has been customary to put such solutions in concentrated form in bottles or like containers and dilute them prior to use. This, of course, necessitates the additional diluting operation and usually requires the use of distilled water since ordinary tap water is generally not suitable for the purpose of diluting such repellent solutions. 1 A number of difilculties have been encountered heretofore in'attempts to use planographic repellent solutions of low water content and among these have been the glazing of the ink rolls embodied in rotary oii'set planographic duplicating apparatus. While I am not entirely certain as to the physical orgchemical phenomena which cause this'objectionable glazing of the ink rolls I believe that it is due to the tendency of such lowz water content repellent solutions to form an emulsion of the oil-in-water type with the greasy orfatty acid inks employed in the rotary offset planographic duplicating apparatus with which such repellent solutions are used as fountain solutions and that the thus formed oil-in-water type emulsion, in some manner not clearly understood, causes the aforesaid objectionable glazing of the ink rolls. In any event, the glazed surface thus formed on the ink rolls repels the ink and thus eventually prevents proper inking of the ink rolls, the master planographic printing plate, the blanket and the copy. Moreover, such glazed surfaces are extremely hard and difficult to remove, being resistant to the action of common solvents and necessitating an abrading operation to effect their removal from the ink rolls.
I have found that the aforesaid glazing action of the repellent solution commences when the water content of the repellent fountain solution is about eighty per cent, by weight, and increases progressively with a decrease in the water content of the solution.
It is well known that when parchment and like cellulose base or other water-absorbent and water-expansible planographic printing plates are moistened with glycerine-water repellent solutions the water content of the solutions causes such plates to stretch or expand with resulting distortion of the image on the master plate and on the copies reproduced therefrom. Such stretching or expansion are directly related to and increase with the water content of a gylcerine-water repellent solution. Hence it will be seen that the stretching or expansion of parchment or like water-absorbent and waterexpansible planographic printing plates may be reduced by reducing the water content of such glycerine-water repellent solutions.
However. in the practice of the present invention I have found that if the water content of a glycerine-water repellent solution is reduced with a view toward, and for the purpose of, prevent.- ing stretching or expansion of water-absorbent and water-expansible planographio .printing plates, such as parchment plates, with resulting proportionate increase in the glycerine content of the solution, the resulting solution tends to form the aforesaid objectionable oil-cin-water type of emulsion with consequent glazin of the ink rolls in the rotary offset planographic printing presses with which such planographic printing plates are used, as explained hereinbefore.
It will thus be seen that for the purpose of minimizing the stretching or expansion of waterabsorbent and water-expansible planographic printing plates moistened thereby it is desirable to reduce the water content of a glycerine-water repellent solution so that the same be relatively low in relation to the glycerine content, while at the same time, for the purpose of preventing the formation of the aforesaid objectionable oilin-water type emulsion with greasy or fatty acidcontaining planographic printing inks it is desirable that the water content of such glycerinewater repellent solutions be relatively high in relation to the glycerine content.
Prior glycerine-water repellent solutions have usually been somewhat acid in nature and, as pointed out hereinbefore, cause objectionable stretching or expansion of water-absorbent and water-expanslble planographic printing plates moistened thereby including parchment plates and the like. However, in the practice of the present invention I have found that the water content of a glycerine-water repellent solution may be maintained relatively high in relation to the glycerine content, and the glycerine content of the solution correspondingly low, without causing objectionable stretching or expansion of the water-absorbent and water-expansible planograph printing plates moistened by the solution if the solution is rendered somewhat more acid and its pH established and controlled in a manner which will be described presently. So to do is a primary object of the present invention.
Related objects of the present invention are to provide a new and improved low water content glycerine-water repellent solution which when used as a fountain solution in conjunction with water-absorbent and water-expansible planographic printing plates, including parchment plates, prevents the objectionable spreading or stretching of such plates incidental to the use of prior glycerine-water planographic repellent fountain solutions. a
Another object of the present invention is to provide a novel method of making the new repellent solution and of assuring that the same has the desired controlled pH value.
Thus I have found that if the water content of the new glycerine-water repellent solution is maintained at not substantially more than eighty per cent of the entire composition or complete solution, and if the glycerine content of the solution is maintained at not substantially less than twenty per cent nor substantially more than eighty per cent of the entire composition or complete solution, by weight, and if the pH of the solution is maintained at not substantially more than 4.0 and not substantially less than 3.0, a repellent fountain solution is afforded which materially reduces the expansion or stretching of parchment and like water-absorbent and waterexpansible planographic printing plates moistened thereby while, at the same time, the new repellent fountain solution materially reduces the tendency of such glycerine-water fountain repellent solutions to form an emulsion of the oil-in-water type with fatty or greasy lithographic inks and hence correspondingly reduces the tendency of such solutions to cause glazing of the ink rolls in rotary planographic duplicating presses with which such repellent fountain solutions are used.
Moreover, I have found that if the glycerine content of the new glycerine-water repellent fountain solution is established at about sixty per cent, .by weight, of the entire composition or complete solution the rate of expansion of parchment and like water-absorbent and water-expansible planographic printing plates moistened thereby is materially less than the rate of expansion in similar plates moistened with prior low glycerine content and high water content repellent fountain solutions and that the total expansion or stretch in similar plates moistened with the prior low glycerine content high water content repellent fountain solutions.
I have found further that if the glycerine content in the new glycerine-repellent fountain solution is increased to eighty per cent or above, by weight, as may be done without causing glazing of the ink rolls, expansion or stretch of parchment and like plates moistened thereby is entirely eliminated.
Moreover, I have found that when the water content of the new glycerine-water repellent fountain solution is decreased to provide a relatively high glycerine content in the new repellent fountain solution the tendency of the repellent fountain solution to form an oil-in-water type emulsion with fatty or greasy lithographic inks and resulting glazing of the ink rolls may be materially reduced by the addition of a preselected quantity of formaldehyde or other watersoluble aldehyde to the solution. When thus incorporated in the new repellent solution the formaldehyde or other water-soluble aldehyde makes it possible to utilize a relatively high glycerine content in the new repellent fountain solutionwithout causing glazing of the ink rolls in the presses with which the new repellent solution is used while, at the same time, the reduction of the pH of the solution to a pH of not substantially in excess of 4.0 makes it possible to employ a relatively high water content in the new repellent solution while materially reducing both the rate of expansion and the total expansion or stretch of parchment and like waterabsorbent and water-expansible planographic printing plates moistened thereby.
A suitable formula which may be employed in preparing the new planographic repellent fountain solution is shown in the following example in which all parts are in terms of per cent, by weight:
" Example No. 1
Per cent by weight Formaldehyde (37 per cent solution in water) (Formalin) 0.5
Mono-ammonium dihydrogen phosphate Plus 10 cc. of phosphoric acid, HsPOr (85 per cent) in 4000 grams of the complete solution.
It will be noted that the glycerine content of the glycerine-water repellent fountain solution set forth in the foregoing Example No. 1 is approximately sixty per cent by weight of the entire composition or complete solution.
In preparing the new repellent solution having the composition set forth in the foregoing Example No. 1, the mono-ammonium dihydrogen phosphate and the aqueous formaldehyde solution are first preferably thoroughly mixed together, and the glycerine and water are then added to and thoroughly mixed with the solution thus formed. By thus mixing the various ingredients of the new repellent solutions the pH of the solutiondrops in the presence of the formaldehyde and comes to an equilibrium in a signiflcantly shorter time than would otherwise be required to bring the pH of the solution to equilibrium if the formaldehyde were added last. "The quantity of phosphoric acid indicated in the foregoing Example No. 1 may then be added to the solution so as to reduce and adjust the pH of the thus completed and resulting solution to a value of approximately 3.0.
In the new repellent solution prepared as in the foregoing Example No. 1 the mono-ammonium phosphate serves as a buffer to maintain the pH of the solution at a value of approximately 3.0, to which pH the solution is reduced by the addition of phosphoric acid.
The formaldehyde component of the new repellent solution, prepared as in the foregoing Example No. 1, serves to prevent the new repellent solution from forming an oil-in-water type of emulsion with fatty or greasy lithographic inks and consequent glazing of the ink rolls of the planographic printing presses with which the new repellent solution may be used. At the same time the formaldehyde component of the solution prevents the formation of fungus mold growth in the solution.
In the practice of the present invention I have found that the quantity of formaldehyde incorporated into the solution should be within a critical range of not substantially less than 0.1 per cent nor substantially more than 2.0 per cent of the complete composition, by weight, the formaldehyde being calculated as HCHO, or equivalent amounts of other water-soluble aldehydes. The quantity of formaldehyde, or other water-soluble aldehyde, employed in the new repellent solution may be varied somewhat between the critical limits specified depending, in part, upon the glycerine content of the solution, being greater for a higher glycerine content and less for a lower gb'cerine content.
In place of all or a part of the formaldehyde specified in the foregoing Example No. l,-I may employ equivalent amounts of other water-soluble aldehydes in the new repellent solution, with correspondingly good and similar results, and among such other water-soluble aldehydes which may be used are furfuraldehyde, acetaldehyde and glyoxal.
Thus, a suitable formula which may be employed in making the new repellent solution, utilizing furfuraldehyde in place of formaldehyde, is illustrated in the following example in which all parts indicated are in terms of per cent by weight:
Example No. 2
Per cent by weight 0.5
Furfuraldehyde (Furfural) Mono-ammonium di-hydrogen phosphate Plus sufficient phosphoric acid (HaPOt) to reduce the pH of the solution to between 3.0 and 4.0.
A suitable formula which may be followed in preparing the new repellent fountain solution and which employs a percentage of glycerine which constitutes the lower limit of the critical range hereinbefore specified, namely, twenty per cent of glycerine, by weight, is shown in the following example in which all parts indicated are in terms of per cent, by weight:
Example No. 3
Per cent by weight Formaldehyde (37 per cent solution in water) (Formalin) 0.5
Mono-ammonium dihydrogen phosphate (NHOHMPOQ 2.0 Glycerine 20.0 Water -3"; 77.5
Plus 2.8 c. c. of phosphoric acid (HsPO-i) per cent) in 4000 grams of the complete solution.
A suitable formula which may be followed in pireparing the new repellent solution with a glycerine content of eighty per cent, by weight, of the entire composition or complete solution. and which is the'upper limit of the aforesaid critical range of the glycerine content of the new repellent fountairr solution, is shown in the following example in which all parts indicated are in terms of per cent by weight:
Example No. 4
n Per cent by weight Formaldehyde (37 per cent solution in water) (Formalin) 0.5
Mono-ammonium dihydrogen phosphate (NHA) H2(P04) 2.0 Glycerine 80.0 Water 17.5
Plus 8.9 c. c. of phosphoric acid (HJPOO (85 per cent) in 4000 grams of. the com plete solution.
plates with which it is used but appears to remain upon the surface thereof.
By the terms complete solution and complete repellent solution, as usedhereinafter in the claims, in reference to the percentages in which the several ingredients or components of the solution are employed in making the same, is meant the solution as it exists and is composed prior to the addition of the phosphoric acid (H2204) thereto.
It will thus be seen from the foregoing .de-
scription that the present invention provides a a new and improved low water content planographic dampening or so-called repellent fountain solution, and a novel method of preparing the same, and that the present invention thus has the desirable advantages and characteristics, and accomplishes its intended objects, including those hereinbefore pointed out and others which are inherent in the invention.
1 I claim: 1. A planographic repellent composition comprising a solution or water, glycerine, monoammonium dihydrogen phosphate and formaldehyde, the said water component of the said planographic repellent composition constituting not substantially more than eighty per cent 01' the complete repellent composition and the aid glycerine component of the said repellent composition constituting not substantially less than twenty per cent nor substantially more than eighty per cent oi the complete repellent composition, by weight, the said formaldehyde component of the said repellent composition constituting not substantiallyless than 0.1 per cent nor substantially more than 2.0 per cent of the complete repellent composition, by weight, and being calculated as 100 per cent formaldehyde, and the said repellent composition having a pH oi not substantially more than 4.0 nor substantially less than 3.0.
2. A planographic repellent composition comprising a solution 01 water, glycerine, monoammonium dihydrogen phosphate (NHOH: (P04) and a water-soluble aldehyde, the said water plete repellent composition, by weight, the said water-soluble aldehyde component of the said repellent composition constituting not substantially less than 0.1 per cent nor substantially more than 2.0 per cent 0! the complete repellent composition, by weight, and being calculated as 100 per cent water-soluble aldehyde, and the said repellent composition having a pH oi. not substantially more than 4.0 nor substantially less than 3.0.
3. A planographic repellent composition as deiined in claim 1 which contains, in addition to the ingredients therein specified, a minor proportion of phosphoric acid (HaPOr).
4. A planographic repellent composition as defined in claim 2 which contains, in addition to the ingredients therein specified, a minor proportion of phosphoric acid (HaPOO CHARLES H. VAN DUSEN, Ja.
REFERENCES crrnn The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,976,039 Rowell Oct. 9, 1934 2,003,286 Wescott May 28, 1935 2,240,486 Beckley May 6, 1941 2,374,070 Barensileld Apr. 17, 1945 2,393,875 Van Dusen Jan. 29, 1946 OTHER REFERENCES The Lithographers Manual (1940), pages 209 and 216, Waltwin Publishing Co., 1776 Broadway, New York city. (Copy in Div. 17.)
Claims (1)
- 2. A PLANOGRAPHIC REPELLENT COMPOSITION COMPRISING A SOLUTION OF WATER, GLYCERINE, MONOAMMONIUM DIHYDROGEN PHOSPHATE
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2692827A (en) * | 1951-04-23 | 1954-10-26 | Warren S D Co | Process of developing photolithographic printing plates |
US2780168A (en) * | 1951-11-16 | 1957-02-05 | John H Schneider | Composition for use in eliminating oil and grease smudges from offset printing mats and plates |
US3029727A (en) * | 1956-07-13 | 1962-04-17 | Polychrome Corp | Method and composition for fixing transfer image |
US3168037A (en) * | 1960-05-02 | 1965-02-02 | Harold P Dahlgren | Means for dampening lithographic offset printing plates |
US3398002A (en) * | 1967-06-29 | 1968-08-20 | Bondurant | Universal fountain solution for planographic printing |
FR2415131A1 (en) * | 1978-01-18 | 1979-08-17 | Vickers Ltd | WETTING COMPOSITION FOR LITHOGRAPHIC PRINTING |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1976039A (en) * | 1932-09-02 | 1934-10-09 | Multigraph Co | Planographic printing |
US2003286A (en) * | 1930-01-02 | 1935-06-04 | Evans Will | Mop |
US2240486A (en) * | 1940-05-01 | 1941-05-06 | Western Electric Co | Composition for use in printing |
US2374070A (en) * | 1942-02-02 | 1945-04-17 | American Steel & Wire Co | Plate and method of preparing the same for offset printing |
US2393875A (en) * | 1944-05-29 | 1946-01-29 | Addressograph Multigraph | Method of etching and dampening planographic printing plates and repellent solution t herefor |
-
1946
- 1946-04-05 US US659870A patent/US2515536A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2003286A (en) * | 1930-01-02 | 1935-06-04 | Evans Will | Mop |
US1976039A (en) * | 1932-09-02 | 1934-10-09 | Multigraph Co | Planographic printing |
US2240486A (en) * | 1940-05-01 | 1941-05-06 | Western Electric Co | Composition for use in printing |
US2374070A (en) * | 1942-02-02 | 1945-04-17 | American Steel & Wire Co | Plate and method of preparing the same for offset printing |
US2393875A (en) * | 1944-05-29 | 1946-01-29 | Addressograph Multigraph | Method of etching and dampening planographic printing plates and repellent solution t herefor |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2692827A (en) * | 1951-04-23 | 1954-10-26 | Warren S D Co | Process of developing photolithographic printing plates |
US2780168A (en) * | 1951-11-16 | 1957-02-05 | John H Schneider | Composition for use in eliminating oil and grease smudges from offset printing mats and plates |
US3029727A (en) * | 1956-07-13 | 1962-04-17 | Polychrome Corp | Method and composition for fixing transfer image |
US3168037A (en) * | 1960-05-02 | 1965-02-02 | Harold P Dahlgren | Means for dampening lithographic offset printing plates |
US3398002A (en) * | 1967-06-29 | 1968-08-20 | Bondurant | Universal fountain solution for planographic printing |
FR2415131A1 (en) * | 1978-01-18 | 1979-08-17 | Vickers Ltd | WETTING COMPOSITION FOR LITHOGRAPHIC PRINTING |
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