US3833379A - Developer composition for lithographic printing plates - Google Patents

Developer composition for lithographic printing plates Download PDF

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Publication number
US3833379A
US3833379A US00322875A US32287573A US3833379A US 3833379 A US3833379 A US 3833379A US 00322875 A US00322875 A US 00322875A US 32287573 A US32287573 A US 32287573A US 3833379 A US3833379 A US 3833379A
Authority
US
United States
Prior art keywords
developer
group
compound
lithographic printing
printing plates
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
Application number
US00322875A
Other languages
English (en)
Inventor
Y Sakazume
A Oshima
K Jin
M Nakano
T Uchida
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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 Konica Minolta Inc filed Critical Konica Minolta Inc
Application granted granted Critical
Publication of US3833379A publication Critical patent/US3833379A/en
Assigned to KONICA CORPORATION reassignment KONICA CORPORATION RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: KONISAIROKU PHOTO INDUSTRY CO., LTD.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
    • G03C5/29—Development processes or agents therefor
    • G03C5/305—Additives other than developers

Definitions

  • This invention relates to a developer formulation for silver halide-containing lithographic printing plates which comprises an infectious developer containing hydroquinone as developing agent and, incorporated therein, a compound of the general formula shown below, and aims to overcome the degradation in infectious developability of the infectious developer which is caused by oxidation of the hydroquinone contained therein.
  • R is a hydrogen atom, an alkyl group, a hydroxy group or a carboxy group
  • R is a hydrogen atom, on alkyl group, a halogen atom, or a carboxy-alkyl group
  • R is a hydrogen atom, a cyano group, a halogen atom or a carboxy group, provided that R and R may bond together to form a benzene ring.
  • a lithographic printing master plate bearing a linear or dot image is obtained by developing a lith-type photosensitive material with an infectious developer, which is a hard tone developer.
  • the infectious developer contains hydroquinone as developing agent and, in addition thereto, sodium sulfite and paraformaldehyde. It is considered that the said components bring about such reaction as CH O Na SO H O f CH O NaSO +NaOH to make the developer eitremely low in free sulfite ion concentration. If the infectious developer with the low sulfite concentration is used, the active hydroquinone (semiquinone) in the developer is rather safe from the attack by sulfite ion retaining its active state over a long period of time.
  • the abovementioned infectious developer containing hydroquinone as developing agent which is low in sulfite ion concentration has the disadvantage that the hydroquinone is readily oxidized with lapse of time after preparation of the developer, with the result that the developer is deprived of its infectious developability.
  • the known infectious developer having the abovementioned disadvantage is not satisfactory in practice, and has been required to be improved in storability.
  • the compound according to the present invention may be added in a proportion of more than 50 g. per liter of the developer. Even if the compound is added in such a large amount as above, however, the practical effect is not increased as much.
  • EXAMPLE 1 A commercially available lithographic film was exposed to light through a gray-scale, and was then developed at 27C. for 2 minutes with each of the developers of the composition shown below immediately after preparation and the same developers as above except that these had been incubated for 24 hours in contact with the air (contact area 28 cm /liter). Thereafter, the sample was subjected to fixing, water-washing and drying treatments and measured in photographic properties to obtain the results as set forth in the table shown below.
  • a developer composition of low free sulfite concentration for silver halide-containing lithographic printing plates which comprises an infectious developer containing hydroquinone as developing agentand, in-

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US00322875A 1972-01-17 1973-01-11 Developer composition for lithographic printing plates Expired - Lifetime US3833379A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47006166A JPS5040042B2 (enExample) 1972-01-17 1972-01-17

Publications (1)

Publication Number Publication Date
US3833379A true US3833379A (en) 1974-09-03

Family

ID=11630934

Family Applications (1)

Application Number Title Priority Date Filing Date
US00322875A Expired - Lifetime US3833379A (en) 1972-01-17 1973-01-11 Developer composition for lithographic printing plates

Country Status (7)

Country Link
US (1) US3833379A (enExample)
JP (1) JPS5040042B2 (enExample)
BE (1) BE794129A (enExample)
DE (1) DE2301668A1 (enExample)
FR (1) FR2168400B1 (enExample)
GB (1) GB1390733A (enExample)
NL (1) NL7300712A (enExample)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2573027A (en) * 1944-11-13 1951-10-30 Ilford Ltd Photographic element and process utilizing antibronzing agents
US2845349A (en) * 1955-09-07 1958-07-29 Powers Chemco Inc Photographic developers
US3295981A (en) * 1965-01-12 1967-01-03 Eastman Kodak Co Stabilizing a silver halide emulsion hardened with formaldehyde and mucochloric acid
US3667954A (en) * 1969-04-21 1972-06-06 Keuffel & Esser Co Tribromomethyl sulfonyl pyridazine or phthalazine photoactivators

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2573027A (en) * 1944-11-13 1951-10-30 Ilford Ltd Photographic element and process utilizing antibronzing agents
US2845349A (en) * 1955-09-07 1958-07-29 Powers Chemco Inc Photographic developers
US3295981A (en) * 1965-01-12 1967-01-03 Eastman Kodak Co Stabilizing a silver halide emulsion hardened with formaldehyde and mucochloric acid
US3667954A (en) * 1969-04-21 1972-06-06 Keuffel & Esser Co Tribromomethyl sulfonyl pyridazine or phthalazine photoactivators

Also Published As

Publication number Publication date
JPS4876601A (enExample) 1973-10-15
FR2168400A1 (enExample) 1973-08-31
FR2168400B1 (enExample) 1976-05-14
JPS5040042B2 (enExample) 1975-12-22
GB1390733A (en) 1975-04-16
NL7300712A (enExample) 1973-07-19
BE794129A (fr) 1973-05-16
DE2301668A1 (de) 1973-07-26

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Legal Events

Date Code Title Description
AS Assignment

Owner name: KONICA CORPORATION, JAPAN

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:KONISAIROKU PHOTO INDUSTRY CO., LTD.;REEL/FRAME:005159/0302

Effective date: 19871021