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
  • G03C1/52—Compositions containing diazo compounds as photosensitive substances
  • G03C1/61—Compositions containing diazo compounds as photosensitive substances with non-macromolecular additives
• • 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
  • G03C1/815—Photosensitive materials characterised by the base or auxiliary layers characterised by means for filtering or absorbing ultraviolet light, e.g. optical bleaching
  • G03C1/8155—Organic compounds therefor
• • 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
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
  • Y10S430/167—X-ray
  • Y10S430/168—X-ray exposure process

Definitions

• ABSTRACT A diazotype material for use in making copies of X-ray films which comprises a support carrying a light-sensitive layer containing at least one diazonium compound, a coupler and a non-light-sensitive ultra-violet absorber, the ultra-violet absorber being effective in screening out radiation in the range of 3,400 to 4,000 A, being transparent to all radiation at or above 4,300 A and being present in an amount such as to give a background absorbance of at least 0.9 at 4,000 A.
• the present invention is based upon the discovery that it is possible to produce copies of X-ray films acceptable to the medical profession by using a two-component diazotype material which comprises a support carrying a light-sensitive layer containing at least one diazonium compound, a coupler and a non-light sensitive ultra-violet absorber, the ultra-violet absorber being effective in screening out radiation in the range of 3,400 to 4,000 A, being transparent to all radiation at or above 4,300 A and being present in an amount such as to give a background absorbance of at least 0.9 at 4,000 A.
• a two component diazotype material for use in making from microfilms copies from which further copies can be made has been proposed in British Specification No. 1094374.
• This material contains an ultra-violet absorber which is effective in screening out radiation having a wave length in the range of 3,400 3,900 A, is transparent to radiation of wave length at and above 4,000 A, and is present in an amount giving a maximum background absorbance of 0.6 at 4,000 A.
• U.V. absorber which can be utilized in the diazotype material according to the invention is 7-diethylamino-4- methyl-coumarin which is on sale as an optical whitening agent under the Registered Trade Mark Coumalux.
• Diazotype material containing this U.V. absorber and with the lightsensitive layer supported on a transparent film backing has been found to have, in the bleached and developed condition, an absorbance of 1.52 at 3,400 A, a peak absorbance of 1.9 at 3,720 A, an absorbance of 1.18 at 4,000 A, an absorbance of 0.08 at 4,300 A and an absorbance of0.06 at 4,400 A.
• U.V. absorber Another example of U.V. absorber which can be used is the coumarin derivative sold by ClBA under the Trade Mark U- VlTEX SWR."
• Diazotype material containing this U.V. absorber in its light-sensitive layer has, in the bleached and developed condition, an absorbance considerably in excess of 2 in the range 3,400-4,000 A, an absorbance of 0.2 at 4,300 A and an absorbance of 0. 16 at 4,400 A.
• the light-sensitive layer of the diazotype material according to the invention may be transparent to radiation of wavelength 4,400 A or more. It will normally include in its light-sensitive layer two or more diazonium compounds having overlapping absorption curves. Preferably the background absorbance of the light-sensitive layer does not exceed 2.0.
• the support may normally be a transparent film of, for example, a polyester, such as Melinex (Registered Trade Mark) or cellulose acetate because the medical profession prefers to examine X-ray photographs as transparencies. Adequate copies of X-ray films can, however, be produced on diazotype material having a paper support.
• Suitable couplers are: 2,3-naphthalenediol; naphthalene 2,3-dihydroxy-6-sulphinic acid; resorcinol; 4,4'-diresorcinol, acetoacetanilide; acetoacet-o-toluidide; chlororesorcinol; N,N-bis-B-hydroxyethyl-2-hydroxy-3-naphthoamide; N-( 2 '-methylphenyl )-2- hydroxy-3-naphthoamide; N-y-morpholino-n-propyl-Z- hydroxy-3-naphthoamide and N,N-bis-B-hydroxyethyl-2- hydroxy-3-naphthoamide.
• the coating weight of the sensitizer was adjusted to give a maximum optical transmission density of 1.5.
• the background absorbance of the material was approximately 1.06.
• This diazotype material gives good reproduction of X-ray films of the silver type.
• Example 2 The procedure of Example l was repeated except that an equivalent amount of cellulose acetate propionate was utilised in the lacquer in place of the cellulose acetate butyrate.
• the background absorbance of the diazotype material was 1-diazo-4-(N,N-dimethylamino)-benzene i l 1 ()6 fluoroborate borate 0.6 appto y ldiazo-3-methyl-4-ethylamino-benzene fluoroborate EXAMPLE 3 l-diazo-2,5-diethoxy-4-morpholino-benzene
• the lacquer and the sensitizer set out in Example 1 were 5 lfgafig 3:3: mixed together in the ratio of l l by volume and coated on the polyester film. After drying at approximately 120 C.,'the coating had a thickness of approximately 0.0003 inch.
• the EXAMPLE9 background absorbance was greater than 0.9. l
• l diazo 4 N hydmxyethypwethylamino benzene lapping absorption curves a coupler and a nonlight sensitive fluoroborate 0.6 g ultra-vlolet absorber consisting essentially of 7-diethylaminoyy y y 4-methyl coumarin, said light-sensitive layer having a bFnzemi ""P 5 background absorbance of at least 0.9 at 4,000 A. l-diazo-2,5-drmethoxy-4-morpholino-benzene fluombome 03 g 2.

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• Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• General Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=10076970

Family Applications (1)

Country Status (9)

Cited By (10)

Families Citing this family (1)

Citations (2)

• 1969
  • 1969-03-28 GB GB1641869A patent/GB1250252A/en not_active Expired
• 1970
  • 1970-03-23 CA CA078084A patent/CA926685A/en not_active Expired
  • 1970-03-24 US US22391A patent/US3661591A/en not_active Expired - Lifetime
  • 1970-03-24 SE SE04045/70A patent/SE356138B/xx unknown
  • 1970-03-26 CH CH468170A patent/CH533318A/de not_active IP Right Cessation
  • 1970-03-26 NL NL7004394A patent/NL7004394A/xx unknown
  • 1970-03-26 BE BE748025D patent/BE748025A/xx unknown
  • 1970-03-26 FR FR7010983A patent/FR2040051A5/fr not_active Expired
  • 1970-03-26 DE DE19702014775 patent/DE2014775A1/de active Pending

Patent Citations (2)

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