GB481702A - Multi-layer light-sensitive photographic material - Google Patents

Abstract

481,702. Photographic multi - layer material. GEVAERT PHOTO - PRODUCTEN N. V. May 19, 1937, No. 13953. Convention date, May 19, 1936. [Class 98 (ii)] A multi-layer lightsensitive material comprises between the light - sensitive layers, at least one non-sensitive layer having a melting point which is between the temperature at which a light sensitive layer can be applied, and the temperature at which a light sensitive would be damaged. Intermediate layers of different melting points are used, and are preferably arranged so that melting points rise in the direction of top to bottom of the material. As fusible materials there may be used waxes, paraffin wax, fatty substances, natural and artificial resins, the intermediate layers being of 2-3 microns thickness. The fusible material should preferably have a refractive index nearly identical with that of the colloid of the light-sensitive layer. In the example described, upon a support T of glass are mounted three layers R, G, B sensitive to red, green-yellow and blue respectively. Between R and G is a layer a of paraffin wax of melting point 70‹ C. Between layer G and B there is a thin paraffin wax layer b having a melting point of 40‹ C. Yellow and red filter dyestuffs may be added to the layer b and a respectively. After exposure, the layers are separated and brought onto transparent supports of similar nature to the layer T. The moistened gelatin layer of the support is pressed onto the layer to be separated, and heated to a temperature just above the melting point of the wax. Material of three or more layers may be separated in this manner.