| 摘要 |
<p>The present invention relates to a method of production of a negative photomechanical film suitable as master for graphic arts and other similar printing processes, using a conventional inkjet printer. The film is made of a transparent substrate, coated with a hydrophobic and water-insoluble resin, opaque to the light (and specifically to the visible and UV light). The ink composition, when printed on the coated film, renders the coating water soluble, so that it can be washed off with washing agents such as plain water, leaving on the film 'negative' images. The invention encompasses the transparent substrate film, the material used to render the film opaque to the visible and UV light and the inkjet ink composition, which does not contain colorants or colouring agents nor pigments, is transparent and colorless and adapted to render water-soluble the opaque resin of the coating. The colouring agents used in the coating of the transparent film of this invention ar actual colouring agents, organic and inorganic pigments and polymeric hollow microspheres. The components of both the coating and the inkjet ink may include pH adjusting agents, humectants, biocides, defoamers surfactants. The properties of the resulting photomechanical negative film are very high opacity against UV and visible light, dimensional stability, water-proof, high resistance against scratch, stability over time, absence of chemicals for exposure and fixing, therefore it is environmental friendly.</p> |
