| 摘要 |
A screen printing stencil composition comprises a) a stabilised aqueous dispersion of a water insoluble addition copolymer having units (Fig. 1): where A is preferably a polyvinylacetate group and B is preferably a polyvinyl N-methylol acrylamide group and B comprises about 3% by weight of the copolymer; b) a water soluble colloid; and c) a photosensitiser. The composition is useful in the formation of a screen printing stencil, the composition having both a long stable pot life and forming a durable stencil. The composition on exposure through a photographic positive can be developed with water and crosslinked with acid. |
