US3661598A - Conversion of electrostatic lithographic masters and composition - Google Patents
Conversion of electrostatic lithographic masters and composition Download PDFInfo
- Publication number
- US3661598A US3661598A US39502A US3661598DA US3661598A US 3661598 A US3661598 A US 3661598A US 39502 A US39502 A US 39502A US 3661598D A US3661598D A US 3661598DA US 3661598 A US3661598 A US 3661598A
- Authority
- US
- United States
- Prior art keywords
- solution
- conversion
- electrostatic
- master
- sulfite
- 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.)
- Expired - Lifetime
Links
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 44
- 239000000203 mixture Substances 0.000 title description 8
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims abstract description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 16
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 229910052783 alkali metal Inorganic materials 0.000 claims description 5
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 claims description 3
- 150000001340 alkali metals Chemical class 0.000 claims description 3
- 238000009736 wetting Methods 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims 1
- 239000000243 solution Substances 0.000 description 48
- 238000000354 decomposition reaction Methods 0.000 description 8
- 239000000276 potassium ferrocyanide Substances 0.000 description 7
- XOGGUFAVLNCTRS-UHFFFAOYSA-N tetrapotassium;iron(2+);hexacyanide Chemical compound [K+].[K+].[K+].[K+].[Fe+2].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] XOGGUFAVLNCTRS-UHFFFAOYSA-N 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 6
- YAGKRVSRTSUGEY-UHFFFAOYSA-N ferricyanide Chemical compound [Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] YAGKRVSRTSUGEY-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000010979 pH adjustment Methods 0.000 description 4
- 230000002940 repellent Effects 0.000 description 4
- 239000005871 repellent Substances 0.000 description 4
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- -1 hydronium ions Chemical class 0.000 description 3
- BHZRJJOHZFYXTO-UHFFFAOYSA-L potassium sulfite Chemical compound [K+].[K+].[O-]S([O-])=O BHZRJJOHZFYXTO-UHFFFAOYSA-L 0.000 description 3
- 235000019252 potassium sulphite Nutrition 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 description 2
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000000872 buffer Substances 0.000 description 2
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 description 2
- 230000005660 hydrophilic surface Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 235000010265 sodium sulphite Nutrition 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 206010047571 Visual impairment Diseases 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 239000003906 humectant Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 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 the production of copy by electrophotographic technique, using an electrostatic planographic master having a coating of photoconductive zinc oxide or other photoconductive particulate material in an organic resinous binder and it relates more particularly to a conversion solution for treatment of the surface of the imaged master to convert the non-imaged portions of the coated master to a water insoluble, ink repellent, hydrophilic surface.
- a master sheet is fabricated of a base sheet of metal, plastics, paper or the like having a photoconductive zinc oxide resinous binder coating which has the desired photoconductive properties for the development of a latent electrostatic image by electrostatic technique.
- the surface still requires treatment to convert the non-imaged portions of the master surface from an organophilic surface to a water receptive, ink repellent lithographic surface in order to enable use of the imaged master in the production of copies by offset or lithographic technique.
- Such solution for treatment to convert the non-imaged portions is hereinafter referred to as a conversion solution.
- the ferrocyanide decomposes rapidly in solution with the resultant formation of unstable ferricyanide and hydronium ions.
- the rate of decomposition is accelerated by exposure to light and/or air.
- the decomposition rate is further accelerated with increased acidity, and decomposition is significant at the acidity required for effective use of the solution for conversion to a hydrophilic surface.
- Decomposition is accompanied by a rapid and continuous darkening of the solution and precipitation of insoluble products.
- the conversion solution is applied as a thin film to the surface of the imaged master to convert the non-imaged portions.
- decomposition becomes even more rapid and the resulting decomposition products that are formed on the surface of the master appear to be detrimental to the proper and effective conversion of the master surface and further limit the storage life of the imaged master.
- the desirable results can be secured when the dissolved sulfite is present in the solution in an amount within the range of 0.1 to 5 percent by weight but it is preferred to make use of the sulfite within the range of 0.25 to 2.5 percent by weight of the conversion solution.
- ferrocyanide component use can be made of ammonium or alkali metal ferrocyanides and preferably potassium ferrocyanide in amounts ranging from 0.5 to 5 percent by weight and preferably in an amount within the range of l to 2.5 percent by weight.
- conversion solution based upon ferrocyanide will usually, but not necessarily, contain a buffer such as monobasic ammonium phosphate, and pH adjustment to the desired level below 5 and preferably within the range of 4.0 to 4.5 can be achieved with an acidic medium, such as phosphoric acid.
- EXAMPLE 1 2.0 potassium ferrocyanide 8.0 monobasic ammonium phosphate 0.l disodium ethylene diamine tetraacetate l.0 potassium sulfite 88.9 water The solution is adjusted to a pH of 4.5 with phosphoric acid.
- EXAMPLE 2 2.0 potassium ferrocyanide 8.0 monobasic ammonium phosphate 0.5 potassium sulfite 89.5 water The solution was adjusted to a pH of 4.0 with phosphoric acid. After 30 hours of exposure, the solution remained clear and pale yellow in color and gave a negative test for ferricyanide.
- EXAMPLE 3 1.5 potassium ferrocyanide 6.0 monobasic ammonium phosphate 0.1 disodium ethylene diamine tetraacetate 1.5 sodium sulfite 9 l .9 water The solution was adjusted to a pH of 4.0 to 4.55 with phosphoric acid. After 30 hours of exposure the solution remained clear and pale yellow in color and gave a negative test for ferricyanide.
- Examples 1 to 3 were swabbed onto a photoconductive zinc oxide coated lithographic master after image development with ,a liquid electrostatic toner which deposited hydrophobic particles in the imaged areas of the plate. After swabbing with the conversion solution, the imaged master was mounted on a lithographic press and copies of good quality were secured by conventional lithographic technique of first wetting the imaged master with an aqueous repellent and then with an oleaginous ink followed by transfer of the inked image onto copy sheets.
- Example 4 2.0 potassium ferrocyanide 8.0 monobasic ammonium phosphate 90.0 water
- EXAMPLE 5 The composition of Example 5 was the same as that of Example 4 except that the pH adjustment with phosphoric acid was to a pH of 4.01. After 30 hours of exposure, the solution appeared dark brown and was heavy with precipitate. It gave a positive test for ferricyanide and conversion with the resulting solution was unsatisfactory.
- EXAMPLE 6 The composition was the same as that of Examples 4 and 5 but pH adjustment with phosphoric acid was made to 4.9. After 30 hours exposure, the solution was orange-yellow in color with a slight precipitate. It gave a positive test for ferricyanide and conversion was unsatisfactory. v e
- a stabilized conversion solution for electrostatic oflset masters having a surface in the form of a resinous bonded coating containing a photoconductive component to render the non-imaged portions hydrophilic
- a stabilized conversion solution for electrostatic oflset masters having a surface in the form of a resinous bonded coating containing a photoconductive component to render the non-imaged portions hydrophilic
Landscapes
- Printing Plates And Materials Therefor (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3950270A | 1970-05-21 | 1970-05-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3661598A true US3661598A (en) | 1972-05-09 |
Family
ID=21905820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US39502A Expired - Lifetime US3661598A (en) | 1970-05-21 | 1970-05-21 | Conversion of electrostatic lithographic masters and composition |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US3661598A (enExample) |
| BE (1) | BE767097A (enExample) |
| CA (1) | CA963604A (enExample) |
| DE (1) | DE2125014B2 (enExample) |
| DK (1) | DK128586B (enExample) |
| FR (1) | FR2091151A5 (enExample) |
| GB (1) | GB1321380A (enExample) |
| NL (1) | NL7106728A (enExample) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4007126A (en) * | 1975-07-30 | 1977-02-08 | Scott Paper Company | Electrophotographic master conversion solution |
| US4043811A (en) * | 1976-07-29 | 1977-08-23 | Addressograph Multigraph Corporation | Conversion solutions for planographic masters |
| US4053319A (en) * | 1973-06-04 | 1977-10-11 | Itek Corporation | Hydrophilizing composition for lithographic printing plates |
| US4116698A (en) * | 1975-12-19 | 1978-09-26 | Ricoh Co., Ltd. | Ferrocyanate treating liquid for offset master |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3081146A (en) * | 1959-02-27 | 1963-03-12 | Nalco Chemical Co | Inhibition of corrosion of metal surfaces in contact with corrosive aqueous media |
| US3522062A (en) * | 1968-03-25 | 1970-07-28 | Ricoh Kk | Treating solution for planographic printing plates made with electrophotographic recording papers |
-
1970
- 1970-05-21 US US39502A patent/US3661598A/en not_active Expired - Lifetime
-
1971
- 1971-04-14 CA CA110,342A patent/CA963604A/en not_active Expired
- 1971-04-29 GB GB1216671*[A patent/GB1321380A/en not_active Expired
- 1971-05-04 FR FR7115962A patent/FR2091151A5/fr not_active Expired
- 1971-05-12 BE BE767097A patent/BE767097A/xx unknown
- 1971-05-17 NL NL7106728A patent/NL7106728A/xx unknown
- 1971-05-19 DE DE19712125014 patent/DE2125014B2/de not_active Withdrawn
- 1971-05-19 DK DK241571AA patent/DK128586B/da unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3081146A (en) * | 1959-02-27 | 1963-03-12 | Nalco Chemical Co | Inhibition of corrosion of metal surfaces in contact with corrosive aqueous media |
| US3522062A (en) * | 1968-03-25 | 1970-07-28 | Ricoh Kk | Treating solution for planographic printing plates made with electrophotographic recording papers |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4053319A (en) * | 1973-06-04 | 1977-10-11 | Itek Corporation | Hydrophilizing composition for lithographic printing plates |
| US4007126A (en) * | 1975-07-30 | 1977-02-08 | Scott Paper Company | Electrophotographic master conversion solution |
| US4116698A (en) * | 1975-12-19 | 1978-09-26 | Ricoh Co., Ltd. | Ferrocyanate treating liquid for offset master |
| US4043811A (en) * | 1976-07-29 | 1977-08-23 | Addressograph Multigraph Corporation | Conversion solutions for planographic masters |
Also Published As
| Publication number | Publication date |
|---|---|
| DK128586B (da) | 1974-05-27 |
| BE767097A (fr) | 1971-10-01 |
| CA963604A (en) | 1975-03-04 |
| FR2091151A5 (enExample) | 1972-01-14 |
| NL7106728A (enExample) | 1971-11-23 |
| DE2125014A1 (de) | 1971-12-02 |
| DE2125014B2 (de) | 1973-08-09 |
| GB1321380A (en) | 1973-06-27 |
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