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
  • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
  • G03C1/795—Photosensitive materials characterised by the base or auxiliary layers the base being of macromolecular substances

Definitions

• Our present invention relates to photographic film and more particularly to such a film with an improved support.
• phosphoric acid esters of an alcohol which is derived from a fatty acid such as trioctylphosphate, diisoamylbutylphosphate, diethylphosphate, or butylphosphate
• softening agents have no dissolving action on cellulose derivatives and in contradistinction to the softening agents having a dissolving action on cellulose have a more favorable influence on the mechanical properties of the films made from cellulose derivatives.
• softening agents having no dissolving action on cellulose ester and which are derived from vegetable oils containing the glycerides of fatty acids having from 8 tol l carbon atoms are particularly suited as softening agents for cellulose esters for the manufacture of supports of photographic films.
• oils are, for'instance, cocoa nut oil, palm nut oil, and laurel-oil.
• esters of the mixture of fatty acids obtained by saponification of the glycerides with a monovalent alcohol the esters of the alcohols obtained from the oils by simultaneous saponification and hydrogenation with aliphatic acids, or aromatic acids, or halogen hydracids, or phosphoric acid; the ethers of the aforesaid alcohols.
• the softening agents are suitable for the ;manufacture of supports for photographic films they must not contain strongly smelling compounds. For this reason, for instance, the esters of the mixture of fatty acids from the above mentioned oils with methyl alcohol or ethyl al 3 cohol are not suitable.
• the esters of such a fatty acid and propyl alcohol or a higher alcohol preferably an alcohol having more than 5 carbon atoms.
• the separation of compounds of low molecular weight which yield strongly smelling constituents may be effected by distillation in the vacuum before or 7 after conversion of the oils into their derivatives. For the same reason the nitriles of fatty "acids are useless.
• softeners for nitrocellulose.
• the mixtures of softening agents are suitable for the preparation of films from cellulose nitrate and for films from organic cellulose ester, for instance, cellulose acetate; cellulose nitroacetate, cellulose acetobutyrate, cellulose butyrate and other technically useful cellulose esters. It is clear that not all of the products have the same action. A few experiments will be sufficient to ascertain which of the softeners suggested have the best effect for films made of a certain cellulose ester or a mixture of cellulose esters, to render it elastic and resistant to mechanical strain.
• the conversion products of fatty acids with more than 14 carbon atoms have no longer the same good properties as softeners than have the conversion products of fatty acids with a number of carbon atoms between 8 and 14. Mixtures, containing a large amount of such fatty acids should therefore not be employed for the purpose in question.
• the softeners for the manufacture of support for photographic films according to this invention can also be used in admixture with the softeners hitherto known for this purpose and even then an improved product will be obtained.
• Example 1 -20 parts of nitrocellulose containing 12.2 per cent of nitrogen are dissolved in 100 parts of a'mixture consisting of 8 parts of acetone and 2 parts of ethyl alcohol while adding 2 parts of amyl ester of the acids from laurel oil containing 8 to 14 carbon atoms.
• the solution is cast in known manner to form a film of 0.130 mm. thickness.
• the process'of manufacturing a support for photographic layers which comprises dissolving cellulose acetate containing 56 per cent of acetic acid in a mixture of methylene chloride, chloroform and amylalcohol; adding as a softening agent diphenylphosphate havingthe last hydrogen atom'esterified by the alcohols containing 8 to 14 carbon atoms obtainable from cocoa nut oil, and triphenylphosphate and casting the solution to form a film.
• a support for photographic layers comprising celluloseacetate containing 56 per cent of acetic acid and diphneylphosphate having the last hydrogen atom esterified by the alcohols containing 8 to 14 carbon atoms obtainable from cocoa nut oil. and triphenylphosphate.

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• Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• General Physics & Mathematics (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Manufacture Of Macromolecular Shaped Articles (AREA)
• Polysaccharides And Polysaccharide Derivatives (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6477131

Family Applications (1)

Country Status (5)

Families Citing this family (1)

• 0
  • BE BE401736D patent/BE401736A/xx unknown
• 1933
  • 1933-03-04 DE DEI46681D patent/DE683061C/de not_active Expired
• 1934
  • 1934-03-01 FR FR769485D patent/FR769485A/fr not_active Expired
  • 1934-03-02 US US713770A patent/US2071462A/en not_active Expired - Lifetime
  • 1934-03-05 GB GB6985/34A patent/GB426023A/en not_active Expired

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