G - Physics
03
C
96/172, 101/48
G03C 1/70 (1985.01)
Patent
CA 1269561
SCREEN EMULSIONS ABSTRACT OF THE DISCLOSURE Screen emulsions in accordance with the present invention include a poly vinyl alcohol and poly vinyl acetate or a poly vinyl acetate copolymer emulsified in water along with appropriate amounts of diacetone acrylamide and an acrylic monomer. The emulsions preferably also include a cyclic amide, phthalatic plasticizers, an initiator of monomer polymerization and a thermal stabilizer. The emulsions are intended to be admixed with a photosensitive free radical-generating compound that initiates cross-linking of the polymeric components and applied to a mesh or screen. The screen is overlaid with an obliterating material, exposed to light and washed to remove non-exposed emulsion. The resulting screen can be used without further hardening with both water- and solvent-based inks, and the film can be removed with emulsion-removing chemicals to permit reuse of the screen.
502780
Advance Process Supply Company
Knoth Dale W.
Macrae & Co.
Naz-Dar Company
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