CH598627
1513149 Making multi-coloured reproduction using coloured photohardenable layers AMERICAN HOECHST CORP 28 May 1975 [29 May 1974] 23347/75 Heading G2C A method comprises (1) exposing a single, coloured photohardenable layer on a support with no intermediate stripping layer, through a colour separatio...
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Zusammenfassung: | 1513149 Making multi-coloured reproduction using coloured photohardenable layers AMERICAN HOECHST CORP 28 May 1975 [29 May 1974] 23347/75 Heading G2C A method comprises (1) exposing a single, coloured photohardenable layer on a support with no intermediate stripping layer, through a colour separation negative for that colour, (2) developing to remove the non-light-struck, non-image areas while leaving the light-struck, image areas on the support, (3) contacting the image areas on the support with a receptor sheet, either (a) the surface of the support with the image areas thereon or (b) the receptor sheet bearing a layer of thermoplastic adhesive, the contacting being effected at a temperature and pressure sufficient to transfer the image areas to the receptor sheet, and (4) repeating the steps, at least once, of exposing a further single photohardenable layer, of a different colour, through a colour separation negative for the different colour, developing, and transferring image areas to the receptor sheet without additional adhesive to superimpose the image areas of the different colour directly on to the receptor sheet carrying the image areas of the first colour. The photohardenable layer may be a photopolymerizable layer containing (a) at least one macromolecular binder with pendant acid groups, (b) at least one multifunctional, unsaturated compound capable of forming a polymerly addition polymerization, (c) an addition polymerization initiator activated by radiation and (d) a light-stable dye or pigment. The method is fast and easy to carry out. Individual colours in the overlay may be connected before transferring to the receptor sheet. The image areas do not require post-exposure, do not deteriorate and may be transferred at the convenience of the user. |
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