US1552428A - Light-sensitive acid-resistant composition of matter - Google Patents

Light-sensitive acid-resistant composition of matter Download PDF

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Publication number
US1552428A
US1552428A US516989A US51698921A US1552428A US 1552428 A US1552428 A US 1552428A US 516989 A US516989 A US 516989A US 51698921 A US51698921 A US 51698921A US 1552428 A US1552428 A US 1552428A
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US
United States
Prior art keywords
matter
light
sensitive acid
resistant composition
varnish
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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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US516989A
Inventor
Freundorfer Theodor
Freundorfer Roman
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Individual
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Individual
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Priority to DE1920346339D priority Critical patent/DE346339C/en
Application filed by Individual filed Critical Individual
Priority to US516989A priority patent/US1552428A/en
Application granted granted Critical
Publication of US1552428A publication Critical patent/US1552428A/en
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
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/04—Chromates

Definitions

  • This invention relates to a. light-sensitive acid-resistant composition of matter adapted for application to the metal lates in the process of making etched printing-plates by the photo-mechanical process.
  • the object of the present invention is attained by making use of the following circumstance: If an ammoniacal solution of shellac is mixed with a bichromate it becomes sensitive and any metal-plates treated with this light-sensitive acid-resistant varnish or coating may be, completely etched after printing and developing, without requiring any further operations. At the same time the film has the pro erty that it will not be dissolved by any of t e customary plate-cleaning agents.
  • the varnish is then ready for use and may 40 be preserved for from three to four weeks.
  • the zinc plate is carefully cleaned with very fine emery dust and slightly roughened in a. nitr1c acid bath, and the varnish a plied in the same manner as when fish g ue solution is employed.
  • the applied layer should be thick enough so that no rainbow colors ap ear and that the completed print shows a sight relief. Care should be taken to distribute the 60 varnish absolutely uniformly as inequalities are readily noticeable in the final product.
  • the time of ex osure is approximately the same as for fis lue.
  • the plates are developed in a bat of 1000 0. cm. 96% alcohol and 2 methylviolet B B extra concentration. fivelopment is completed in two to three minutes.
  • a composition of matter for a li ht-sensitive film comprisin an ammoniaca .shellac solution and a solub e bichromate.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • ing And Chemical Polishing (AREA)

Description

Patented Sept. 8, 1925.
UNITED STATES THEODOR FREUNDOBFEB AND ROMAN FREUNDOBFEB, OF MUNICH, GERMANY.
LIGHT-SENSITIVE ACID-RESISTANT COMPOSITION OF MATTER.
No Drawing.
To all whom it may concern:
Be it known that we, THEODOR FREUN- nonrnr. and ROMAN FREUNDORFER, citizens of German residing at Munich, Bavaria,
Germany, ave invented certain new and useful Improvements in Light-Sensitive Acid-Resistant Composition of Matter; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.
This invention relates to a. light-sensitive acid-resistant composition of matter adapted for application to the metal lates in the process of making etched printing-plates by the photo-mechanical process.
The object of the present invention is attained by making use of the following circumstance: If an ammoniacal solution of shellac is mixed with a bichromate it becomes sensitive and any metal-plates treated with this light-sensitive acid-resistant varnish or coating may be, completely etched after printing and developing, without requiring any further operations. At the same time the film has the pro erty that it will not be dissolved by any of t e customary plate-cleaning agents.
Our varnish'or coating ma be conveniently prepared as follows issolve in a water bath 17 0 grams shellac powder in 700 1 0. cm. distilled water and 200 0. cm. ammonia of 0.910 specific gravity. Frequent agitation Application filed November 22, 1921. Serial No. 618,889.
is desirable, and the powder will be found to be entirely dissolved when the mixture reaches the boiling point. The solution is then cooled and has added thereto 30 0. cm. of a 10% solution of ammonium bichromate.
The varnish is then ready for use and may 40 be preserved for from three to four weeks.
In using our varnish, the zinc plate is carefully cleaned with very fine emery dust and slightly roughened in a. nitr1c acid bath, and the varnish a plied in the same manner as when fish g ue solution is employed. The applied layer should be thick enough so that no rainbow colors ap ear and that the completed print shows a sight relief. Care should be taken to distribute the 60 varnish absolutely uniformly as inequalities are readily noticeable in the final product. The time of ex osure is approximately the same as for fis lue. The plates are developed in a bat of 1000 0. cm. 96% alcohol and 2 methylviolet B B extra concentration. fivelopment is completed in two to three minutes.
Accordin ly what is claimed as new and sou ht to be protected by Letters Patent is t e following:
A composition of matter for a li ht-sensitive film comprisin an ammoniaca .shellac solution and a solub e bichromate.
In testimony whereof we hereunto aflix our signatures.
THEODOR FREUNDORFER. ROMAN FREUNDORFER.
US516989A 1921-11-22 1921-11-22 Light-sensitive acid-resistant composition of matter Expired - Lifetime US1552428A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1920346339D DE346339C (en) 1921-11-22 1920-12-14 Supplement sheet
US516989A US1552428A (en) 1921-11-22 1921-11-22 Light-sensitive acid-resistant composition of matter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US516989A US1552428A (en) 1921-11-22 1921-11-22 Light-sensitive acid-resistant composition of matter

Publications (1)

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US1552428A true US1552428A (en) 1925-09-08

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ID=24057912

Family Applications (1)

Application Number Title Priority Date Filing Date
US516989A Expired - Lifetime US1552428A (en) 1921-11-22 1921-11-22 Light-sensitive acid-resistant composition of matter

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US (1) US1552428A (en)
DE (1) DE346339C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5932273A (en) * 1995-09-05 1999-08-03 Mondo Beni Co., Ltd. Gumi candies and a process for making the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5932273A (en) * 1995-09-05 1999-08-03 Mondo Beni Co., Ltd. Gumi candies and a process for making the same

Also Published As

Publication number Publication date
DE346339C (en) 1921-12-31

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