US3666475A - Photographic materials - Google Patents

Photographic materials Download PDF

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Publication number
US3666475A
US3666475A US32781A US3666475DA US3666475A US 3666475 A US3666475 A US 3666475A US 32781 A US32781 A US 32781A US 3666475D A US3666475D A US 3666475DA US 3666475 A US3666475 A US 3666475A
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US
United States
Prior art keywords
polyethylene oxide
emulsion
silver
higher fatty
residues
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
US32781A
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English (en)
Inventor
David Ramsay Douglas
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.)
Ilford Imaging UK Ltd
Original Assignee
Ilford Ltd
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 Ilford Ltd filed Critical Ilford Ltd
Application granted granted Critical
Publication of US3666475A publication Critical patent/US3666475A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03CPHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00Photosensitive materials
    • G03C1/005Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/04Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with macromolecular additives; with layer-forming substances
    • G03C1/043Polyalkylene oxides; Polyalkylene sulfides; Polyalkylene selenides; Polyalkylene tellurides

Definitions

  • This invention relates to photographic light-sensitive materials, and more particularly to photographic materials intended for use in recording half-tone dot images or line images and which carry a gelatin silver halide emulsion of very high contrast characteristics, and which are designed to be developed in formaldehyde-containing lowsulphite hydroquinone developers as well as developers of the more usual types, and which exhibit in the former class of developers the phenomenon known as infectious development.
  • Emulsions of the foregoing type may be developed satisfactorily over a considerable range of development times, other development conditions being held constant.
  • the effective speed of the lith emulsions increases as the development time is increased, and accordingly it is a valuable property of such materials that by controlling development time it is possible to control the eifective emulsion speed.
  • a photographic gelatino silver chlorobromide emulsion consisting essentially of per gram mole of silver in the emulsion, from 0.02-3 g. of a polyethylene oxide which has terminal end groups selected from the class consisting of hydrogen and halogen atoms, carboxyl, amino, and carbamoyl groups and higher fatty alcohol residues, saturated higher fatty acid residues and alkyl phenol residues and from 0.5 to 15 g. of Water-soluble hydrolysed polyvinyl acetate having a molecular weight from 5,000 to 30,000 and whose residual acetate content is at least 35%.
  • the water solubility of the hydrolysed polyvinyl acetates depends on their residual acetate content, determined on a weight basis, and their viscosity characteristics (which in turn depends on their molecular weight).
  • the hydrolysed polyvinyl acetates for use in the present invention must have a molecular weight of at most 30,000 (which means that they are of lower viscosity type) and should be so hydrolysed that they have a residual polyvinyl acetate content of at least 35%.
  • Typical of such products is that commercially known as Gelvatol 40/10 referred to in Example I (Emulsion III) which has molecular weight 10,000 and residual acetate 40% and which is freely soluble in cold water.
  • the molecular weight of the polyethylene oxide or the polyethylene oxide modified by having at least terminal group substituted by a halogen atom or a carboxyl, amino or carbamoyl group should be between 1,000 and 15,000.
  • the molecular weight of the polyethylene oxide modified by having at least one fatty or alkyl phenol terminal group should be between and 15,000.
  • higher alcohols which form ethers with polyethylene oxide are cetyl alcohol and oleyl alcohol.
  • alkyl phenols which form ethers'with polyethylene oxide are isooctylphenol and nonylphenol.
  • saturated higher fatty acids which form estedrs with polyethylene oxide are lauric acid and stearic aci
  • the preferred chlorobromide emulsions for use in the present invention have a chloro-bromide ratio of from 1.5-15 chloride to 1 bromide.
  • Emulsion I A gelatin silver chlorobromide emulsion containing 31 mole percent of silver bromide, having a grain size of 0.2/L, was sulphur sensitized, stabilized and treated with an orthochromatic sensitizing dye. The emulsion was then coated on film.
  • Emulsion II A similar emulsion was treated in the same manner except that 0.17 gr. polyethylene oxide (Carbowax 6000) was added prior to coating.
  • 0.17 gr. polyethylene oxide Carbowax 6000
  • Gelvatol 40/ 10 is a water-soluble polyvinyl acetate which is manufactured by Shawinigan Ltd., and has a molecular weight 10,000 and contains 40% residual acetate.
  • Polyethylene oxide (Carbowax 6000) 0.03 gr. was also added prior to coat ing.
  • Polyethylene oxide compound per gram mole silver 0.04 0.05 Carbowax 6000. Unbranched poly ethylene oxide chain M.W..-. 6000.
  • E. FICHTER Assistant Examiner sion according to claim 1 wherein the polyethylene oxide condensation product has terminal end groups selected U.S. Cl. X.R.

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  • 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)
  • Compositions Of Macromolecular Compounds (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US32781A 1965-09-01 1970-04-28 Photographic materials Expired - Lifetime US3666475A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB37360/65A GB1134410A (en) 1965-09-01 1965-09-01 Photographic silver halide emulsions

Publications (1)

Publication Number Publication Date
US3666475A true US3666475A (en) 1972-05-30

Family

ID=10395873

Family Applications (1)

Application Number Title Priority Date Filing Date
US32781A Expired - Lifetime US3666475A (en) 1965-09-01 1970-04-28 Photographic materials

Country Status (4)

Country Link
US (1) US3666475A (en, 2012)
BE (1) BE686305A (en, 2012)
DE (1) DE1572007A1 (en, 2012)
GB (1) GB1134410A (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947273A (en) * 1973-06-01 1976-03-30 Agfa-Gevaert, N. V. Development modifiers for silver halide emulsions

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947273A (en) * 1973-06-01 1976-03-30 Agfa-Gevaert, N. V. Development modifiers for silver halide emulsions

Also Published As

Publication number Publication date
GB1134410A (en) 1968-11-20
BE686305A (en, 2012) 1967-02-15
DE1572007A1 (de) 1970-01-02

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