Improvements relating to a photographic transfer process


1,135,371. Photographic transfer process. AGFA-GEVAERT A.G. Jan . 7, 1966 [Jan. 8, 1965], No. 900/66. Heading G2C. Relief images of a light-absorbing original on a light-reflecting background are formed by exposing to the original, by means of a high intensity flash, a copying layer which contains a pigment or dye which converts visible light to heat, and a film-forming binder which hardens when heated to 50‹ -300‹ C., treating the exposed layer with a liquid to cause the unexposed parts to swell, and contacting the layer with a receiving sheet thereby transferring a positive relief image. An electronic flash of 300-5, 000 Joules and an exposure time of 10<SP>-2</SP>-10<SP>-4</SP>secs. may be used. The binding agent may be gelatine, polymers containing polymerized units of N-methylol ethers or esters of methacrylamide or acrylamide, and polyacrolein acetal. The binder may also contain hardening agents. Specified pigments are carbon black, graphite, heavy metal oxides and sulphides, and finely divided Ag, Bi, Pb, Fe, Co or Ni. The dye may be an azo-, formazone-, cyanine-, triphenyl or diphenyl methane-, or indigoid dye. Examples 4 and 8 relate to azo-dyes which decompose to form a vesicular image in the layer The total pigment and/or dye concentration may be 0.01-1% by wt. Inert binders e.g. polyvinyl alcohol or polyvinylpyrrolidone may also be included in the layer. Specified liquids for causing the swelling are CH 3 OH and H 2 O.




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