| 摘要 |
<p>Compositions for producing screen printing stencils by the direct emulsion method which include an aqueous, partially-saponified polyvinyl acetate solution in which is dissolved a photosensitive material capable of insolubilising the saponified polyvinyl acetate on exposure to light, certain acrylated prepolymers, and a suitable photoinitiator, the acrylated prepolymers being immiscible with water and being a non-solvent for the poylvinyl acetate. Good exposure latitude can be achieved with easy stencil removal whilst providing tough resists with good definition.</p> |
