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
  • G03C1/30—Hardeners
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31725—Of polyamide
  • Y10T428/31768—Natural source-type polyamide [e.g., casein, gelatin, etc.]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31942—Of aldehyde or ketone condensation product
  • Y10T428/31949—Next to cellulosic
  • Y10T428/31964—Paper

Definitions

• This invention relates to photographic. materials and more particularly to the hardening of gelatin, either when applied as an emulsion layer on photographic films, plates, or papers, or when-applied in the form of a solution as a simple coating or sizing for paper or similar materials.
• Another object is to provide a method of hard- I ening gelatin solutions or layers in general whether in the form of photographic emulsions or merely in the form of a protective coating,
• .alkaryl diketones for example, diacetyl, acetyl caproyl, acetyl benzoyl, or mixtures thereof.
• the diacetyl may be added as a. 10 per cent solution in methanol or other suitable solvent in which case 2 c. c. of the solution are added.
• the emulsion is then coated on a plate orother sup port in the usual manner.
• an emulsion'produced as above can be satisfactorily processed at 100 F. employing developing bath, wash water, fixing bath and final wash at that temperature, whereas an ordinary gelatin emulsion not containing a hardener in accordance with our invention melts and runs off the plate at 85 F. The hardening appears somewhat progressive with melted and is being held at approximately 40 C.
• Example II -To 200 c. c. of a gelatin emulsion 'of the same general type as that described in- Example I there are added 2 c. c. of a 10% methanol solution of acetyl benzoyl the emulsion being melted and held at about 40 C.
• the hardening effect is somewhat less drastic in this case, but this is due solely to the fact that a lower mol. per cent of the hardening agent is employed for the same amount of gelatin.
• Example III As is the case with the product obtained in sion is then coated on a suitable support and is Example I, the product'showed an increase in H melting point of only about 15 F. after'incubaflf tion at 113 F. for 14 days.- Example III.To 200 c. c. of a moderatel sensitive photographic emulsion comprising a silver halide there is added 2 grams of acetyl caproyl under the conditions of the previous examples and an'emulsion is thereby produced which processes satisfactorily at 85 F. upon two acetyl, acetyl, caproyl and acetyl benzoyl )the weeks incubationmay be processed at temperatures as high as 100' F. 1
• Our invention is applicable not only ,to the manufacture of photographic emulsions of satisfactory hardening properties, but may likewise be applied to the manufacture of gelatin solutions which are used forproducing other types of coatings or layers on paper, cloth, film and other surfaces.
• the step which comprises hardening the gelatin by causing it to react with a diketone, whereby a condensation product of gelatin and the diketone is formed.
• the step which comprises hardening the gelatin by causing it to react with a diketone selected from the group comprising the dialkyl diketones, the diaryl diketones, and the alkaryl diketones, whereby a condensation product of gelatin and the diketone is iormed.
• the step which comprises hardening the gelatin by causing it to react with diacetyl, whereby a condensatlon product of gelatin and diacetyl is formed.
• the step. which comprises hardening the gelatin by caus- 'cles provided with a hardened gela 8.
• a photographic material provided with a .ing it to react with acetyl benzoyl, whereby a gelatin silver halide emulsion layer, said layer containing the condensation product ,of gelatin and diacetyl.
• a photographic material provided with a gelatin silver halide emulsion layer, said layer containing the condensation product of gelatin. and acetyl caproyl.
• a photographic material provided with a gelatin silver halide emulsion layer, said layer containing the condensation product of gelatin and acetyl benzoyl.
• composition of matter comprising a solution of gelatin containing diacetyl, said solution being adapted for the production of a hardened gelatin layer containing the condensation product of gelatin and diacetyl.
• step which comprises hardening thegelatin by causing it toreact with a diketone in which the" carbonyl groups are adjacent, whereby a condensation product of gelatin and the diketone is formed;
• composition of matter comprising a solution of' gelatin containing acetylcap'royl and adapted for the production of a hardened gelatin layer containing the condensation product of gelatin and acetyl 'caproyl.
• a composition of matter comprising a solution of gelatin containing acetyl benzoyl and adapted for the production of a hardened gelatin layer containing the condensation product of gelatin and acetyl benaoyl.

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)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Laminated Bodies (AREA)
• Manufacturing Of Micro-Capsules (AREA)

Priority Applications (6)

Applications Claiming Priority (1)

Publications (1)

Family

ID=24968503

Family Applications (1)

Country Status (6)

Cited By (1)

• 0
  • BE BE410719D patent/BE410719A/xx unknown
• 1934
  • 1934-08-04 US US738559A patent/US2063351A/en not_active Expired - Lifetime
• 1935
  • 1935-08-01 FR FR793239D patent/FR793239A/fr not_active Expired
  • 1935-08-01 NL NL74416A patent/NL42549C/xx active
  • 1935-08-02 GB GB21899/35A patent/GB444289A/en not_active Expired
  • 1935-08-02 DE DEK138843D patent/DE706724C/de not_active Expired

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