GB403840A - Improvements in sensitising silver halide emulsions - Google Patents

Improvements in sensitising silver halide emulsions

Info

Publication number
GB403840A
GB403840A GB7335/33A GB733533A GB403840A GB 403840 A GB403840 A GB 403840A GB 7335/33 A GB7335/33 A GB 7335/33A GB 733533 A GB733533 A GB 733533A GB 403840 A GB403840 A GB 403840A
Authority
GB
United Kingdom
Prior art keywords
methyl
benzselenazole
propionylamino
iodide
butyrylamino
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
Application number
GB7335/33A
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Publication of GB403840A publication Critical patent/GB403840A/en
Expired legal-status Critical Current

Links

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
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/08—Sensitivity-increasing substances
    • G03C1/10—Organic substances
    • G03C1/12—Methine and polymethine dyes
    • G03C1/14—Methine and polymethine dyes with an odd number of CH groups
    • G03C1/16—Methine and polymethine dyes with an odd number of CH groups with one CH group

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

Silver halide emulsions are sensitized by incorporating a selenopseudocyanine containing in the benzselenazole nucleus an amino group substituted by the acyl radical of a fatty acid containing more than two and less than six carbon atoms. As suitable fatty acids propionic acid and butyric acid are mentioned. In examples (1) 6-propionylamino-2-methyl-benzselenazole methiodide and 2-iodo-6-methyl-quinoline ethiodide are dissolved in boiling alcohol and an alcoholic solution of sodium ethylate is added; the dye 1-methyl-1<1>-ethyl-5 - propionylamino - 6<1> - methylseleno - pseudocyanine iodide crystallizes out on cooling, (2), 6 - butyrylamino - 2 - methylbenzselenazole methiodide is used in place of the propionylamino compound, the dye 1-methyl-1<1>-ethyl - 5 - butyrylamino - 6<1> - methyl - seleno-pseudocyanine iodide being formed. The 6-propionylamino - and 6 - butyrylamino - 2 - methylbenzselenazole methiodides are made by the action of propionic or butyric anhydride on 2-methyl - 6 - aminobenzselenazole and conversion into the quaternary salt by means of methyl iodide; 2-methyl -6 -amino--benzselenazole is formed by nitrating 2-methyl-benzselenazole and reducing the product with stannous chloride and hydrochloric acid or iron powder and acetic acid. The Specification as open to inspection under Sect. 91 describes also selenopseudocyanine dyes, containing an unsubstituted amino group, as sensitizers. In an example 1-methyl-1<1>-ethyl - 5 - aminoselenopseudocyanine iodide is prepared by boiling 6-amino-2-methyl-benzselenazole with 2-iodoquinoline ethiodide in alcohol and adding an alcoholic solution of sodium ethylate. This subject-matter does not appear in the Specification as accepted.
GB7335/33A 1931-01-14 1933-03-10 Improvements in sensitising silver halide emulsions Expired GB403840A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEI40414D DE631287C (en) 1931-01-14 1931-01-14 Process for the yellow and green sensitization of light-sensitive halogen silver emulsions
DE403840X 1932-03-10

Publications (1)

Publication Number Publication Date
GB403840A true GB403840A (en) 1934-01-04

Family

ID=25898964

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1038/32A Expired GB386791A (en) 1931-01-14 1932-01-13 Improvements in sensitising silver halide emulsions
GB7335/33A Expired GB403840A (en) 1931-01-14 1933-03-10 Improvements in sensitising silver halide emulsions

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB1038/32A Expired GB386791A (en) 1931-01-14 1932-01-13 Improvements in sensitising silver halide emulsions

Country Status (4)

Country Link
BE (1) BE385560A (en)
DE (1) DE631287C (en)
FR (2) FR729634A (en)
GB (2) GB386791A (en)

Also Published As

Publication number Publication date
GB386791A (en) 1933-01-26
DE631287C (en) 1936-06-17
BE385560A (en) 1932-02-29
FR729634A (en) 1932-07-28
FR43271E (en) 1934-04-17

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