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
  • G03C1/04—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with macromolecular additives; with layer-forming substances
  • G03C1/043—Polyalkylene oxides; Polyalkylene sulfides; Polyalkylene selenides; Polyalkylene tellurides

Definitions

• condensation products of an alkylene oxide with glycols such as those having from 8 to 18 carbon atoms as described in U.S. Patent 2,240,472 and British Patent 443,559, condensation products of alkylene oxides with amines, alcohols and carboxylic acids, that is polyalkyleneethers, esters and amides, the preparation of which is described in U.S. Patents 1,970,578 and 2,400,532.
• the polyalkylene oxide or derivatives of alkylene oxide should preferably have a molecular weight of 1500 to' 4000 or more but at least that of 300.
• condensation products of an alkylene oxide i.e., ethylene oxide, propylene oxide and butylene oxide with 1,4-di-isobutyl- 1,4-dimethyl-butynediol of the formula CH CH CH3 CH3
• alkylene oxide i.e., ethylene oxide, propylene oxide and butylene oxide
• speed increasing agents show a marked increase in density for a given exposure.
• Such condensation products should have a molecular weight of at least about 300 but preferably about 1,000 or more, i.e., 4,000 to 150,000 or more.
• the preferred polyoxyalkylene compounds used herein have the following formula CH3 CH3 where m and n together represent'integers ensuring a molecular weight of from about 300 to 150,000 or more.
• the quantity of the polyoxyalkylene derivative employed should range from .1 to 8 gms. per .6 mol of silver halide.
• the speed increasing agents which we have described may be used in various types of photographic emulsions, e.g., non-sensitized emulsions, 'orthochromatic, panchromatic and X-ray emulsions. If used with sensitizing dyes, they may be added to the emulsion before or after the dyes are added.
• Various silver salts may be used as the sensitive element, such as silver bromide, silver iodide, silver chloride or mixed silver halides.
• the polyalkylene derivatives may be used in emulsions intended for color photography, e.g., emulsions containing colorforming components.
• the dispersing agent in the photographic emulsion may be gelatin, or other hydrophilic colloids, such as collodion, albumen, methyl cellulose, polyvinyl alcohol, polyvinylpyrrolidone, or the like.
• Example 2 A silver halide emulsion in gelatin containing 4% silver iodide and 96% silver bromide was prepared in a conventional manner and brought up to its maximum light-sensitivity. It was then readied for coating on film base, that is, melted at 40 C., necessary coating finals were added such as sensitizing dyes, stabilizers and hardeners. A 10% aqueous solution of a condensation product of the above formula having a molecular weight of about 30,000 (Product A) was prepared and 10 cc. of this solution was added to a sample of the above described emulsion, containing about 0.4 mol of silver halide. A sample of the same emulsion, but not containing the speed increasing additive served as a control. The so-prepared emulsion samples were coated on a suitable cellulose ester base and dried. Samples of these film coatings were then exposed in a Type I-B Sensitometer, developed in a developer of the following composition:
• Example [I A silver halide emulsion rin gelatin containing 4% silver iodide and 96% silver bromide was coated on film base in a manner known to the art. After the coating was performed, an aqueous gelatin solution containing 20 grams of gelatin per liter and 1.2 grams of a condensation product of the above formula having a molecular weight of about 500 and sold under the trademark of Surfynol 440 was coated thereon as an antiabrasion layer. After drying, film samples were exposed and processed as described in Example I.
• the samples described exhibited a relative speed of 175 with afog of .10 as compared with a type coating of the same emulsion having an antiabrasion layer similar to that described above, but lacking the speed increasing additive which had a speed of 100 and afog of .13.
• a light-sensitive silver halide emulsion layer having in intimate contact therewith the condensation product of an alkylene oxide having from 2 to 4 carbon atoms with 1,4-diisobutyl-1,4-dimethyl-butyned iol, said condensation product having a molecular weight of at least 300.
• condensation product is employed in an amount of from about .1 to 8 grams per .6 mol of silver halide.
• n and n represent integers providing a molecular weight of at least 300.

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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)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
• Compositions Of Macromolecular Compounds (AREA)

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Cited By (9)

• 0
  • GB GB1053980D patent/GB1053980A/en active Active
• 1963
  • 1963-12-27 US US334019A patent/US3255013A/en not_active Expired - Lifetime
• 1964
  • 1964-12-23 BE BE657501D patent/BE657501A/xx unknown
  • 1964-12-23 DE DEG42352A patent/DE1285872B/de active Pending

Non-Patent Citations (1)

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