US2230156A - Lithographic etching solution - Google Patents

Lithographic etching solution Download PDF

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Publication number
US2230156A
US2230156A US322573A US32257340A US2230156A US 2230156 A US2230156 A US 2230156A US 322573 A US322573 A US 322573A US 32257340 A US32257340 A US 32257340A US 2230156 A US2230156 A US 2230156A
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US
United States
Prior art keywords
etching solution
chromium
lithographic etching
glycol
solutions
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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
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US322573A
Inventor
Everett F Carman
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Interchemical Corp
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Interchemical Corp
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Publication date
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Priority to US322573A priority Critical patent/US2230156A/en
Application granted granted Critical
Publication of US2230156A publication Critical patent/US2230156A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/16—Acidic compositions
    • C23F1/26—Acidic compositions for etching refractory metals

Definitions

  • This invention relates to etching solutions for lithographing plates, and is particularly directed to etching solutions which attack chromium but not copper or conventional exposed bichromated coatings used to prepare lithographic plates.
  • grained copper plate is coated with chromium
  • chromium may be etched by any chemical solution which dissolves chromium but which does not attack the copper.
  • the ordinary aqueous solutions of chemicals tend to attack the developed coating as well, particularly in halitone structures, where the coating may exist only as an isolated dot. As a result, the ordinary aqueous chemical solutions can be used only toproduce line prints, and are not satisfactory for half tones.
  • etching solutions which make possible the etching of chromium while avoiding any attack on copper, or on exposed bichromated gelatin, gum arabic or polyvlnyl'alcohol.
  • These solutions comprise mixtures of .aqueous hydrochloric acid with completely water miscible glycol containing more carbon atoms thanhydroxyl groups, using between about 3 to Mix 6 parts of glycol by volume to 1 part of concentrated aqueous acid (37%).
  • the typical glycols of this type include diethylene glycol, propylene glycol, and dipropylene glycol.
  • Example 1 -3 volumes of propylene glycol with 1 volume of 37% hydrochloric acid v
  • Example 2 6 volumes of diethylene glycol with 1 volume of 37% hydrochloric acid hi'caniple 3 3 volumes of diproplene glycol with 1 volume of 37% hydrochloric acid

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • ing And Chemical Polishing (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)

Description

Patented Jan. 28, 1941 UNITED STATES PATENT OFFICE 7 2,230,156 LITHOGRAPHIC ETCHING SOLUTION Everett F.
Inter-chemical Corpora I corporation of Ohio Carman, Rutherford, N. J., assignor to Hon, New York, N. Y., a
No Drawing Application March 6, 1940,
Serial No. 322,573
2 Claims.
This invention relates to etching solutions for lithographing plates, and is particularly directed to etching solutions which attack chromium but not copper or conventional exposed bichromated coatings used to prepare lithographic plates.
There has recently been developed a new printing plate, comprising a grained coppered printareas. In
ing surface covered with a thin coating of water-receptive chromium in j the non-printing the preparation of such plates,- a
, grained copper plate is coated with chromium,
or polyvinyl alcohol and a bichromated'solution oi gelatin, gum arabic is coated over the chromium. The sensitized coating is then exposed to light through a suitable positive, and the undeveloped coating removed, leaving the chromium bare in the printing portions. The chromium may be etched by any chemical solution which dissolves chromium but which does not attack the copper. However, the ordinary aqueous solutions of chemicals tend to attack the developed coating as well, particularly in halitone structures, where the coating may exist only as an isolated dot. As a result, the ordinary aqueous chemical solutions can be used only toproduce line prints, and are not satisfactory for half tones. I have discovered etching solutions which make possible the etching of chromium while avoiding any attack on copper, or on exposed bichromated gelatin, gum arabic or polyvlnyl'alcohol. These solutions comprise mixtures of .aqueous hydrochloric acid with completely water miscible glycol containing more carbon atoms thanhydroxyl groups, using between about 3 to Mix 6 parts of glycol by volume to 1 part of concentrated aqueous acid (37%). The typical glycols of this type include diethylene glycol, propylene glycol, and dipropylene glycol.
-Typical examples of my invetnion are the following:
Example 1 -3 volumes of propylene glycol with 1 volume of 37% hydrochloric acid v Example 2 6 volumes of diethylene glycol with 1 volume of 37% hydrochloric acid hi'caniple 3 3 volumes of diproplene glycol with 1 volume of 37% hydrochloric acid
US322573A 1940-03-06 1940-03-06 Lithographic etching solution Expired - Lifetime US2230156A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2435889A (en) * 1943-06-02 1948-02-10 Johnson Matthey Co Ltd Production of metallic designs on nonmetallic materials
US2687345A (en) * 1950-11-22 1954-08-24 Printing Dev Inc Etching composition for lithographic plates
US4160691A (en) * 1977-12-09 1979-07-10 International Business Machines Corporation Etch process for chromium
US4376057A (en) * 1980-11-26 1983-03-08 International Business Machines Corporation Etchant composition and use thereof
US20030150840A1 (en) * 2002-02-11 2003-08-14 Gould Electronics Inc. Etching solution for forming an embedded resistor
US20050065823A1 (en) * 2003-09-23 2005-03-24 Siemens Medical Solutions Usa, Inc. Method and apparatus for privacy checking
US20110079578A1 (en) * 2009-10-05 2011-04-07 Kesheng Feng Nickel-Chromium Alloy Stripper for Flexible Wiring Boards

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2435889A (en) * 1943-06-02 1948-02-10 Johnson Matthey Co Ltd Production of metallic designs on nonmetallic materials
US2687345A (en) * 1950-11-22 1954-08-24 Printing Dev Inc Etching composition for lithographic plates
US4160691A (en) * 1977-12-09 1979-07-10 International Business Machines Corporation Etch process for chromium
US4376057A (en) * 1980-11-26 1983-03-08 International Business Machines Corporation Etchant composition and use thereof
US20030150840A1 (en) * 2002-02-11 2003-08-14 Gould Electronics Inc. Etching solution for forming an embedded resistor
US6841084B2 (en) 2002-02-11 2005-01-11 Nikko Materials Usa, Inc. Etching solution for forming an embedded resistor
US20050065823A1 (en) * 2003-09-23 2005-03-24 Siemens Medical Solutions Usa, Inc. Method and apparatus for privacy checking
US20110079578A1 (en) * 2009-10-05 2011-04-07 Kesheng Feng Nickel-Chromium Alloy Stripper for Flexible Wiring Boards
US8486281B2 (en) 2009-10-05 2013-07-16 Kesheng Feng Nickel-chromium alloy stripper for flexible wiring boards

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