US 4,789,621 AGranted

Screen emulsions comprised of diacetone acrylamide

AssigneeAdvance Process Supply Company

InventorDale W. Knoth

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Abstract

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, phthalate 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 then applied to a mesh or screen. The screen is overlaid with an obliterating material, exposed to light and then 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.

Claims10

Dependent claims

A high solids content, low viscosity water-based emulsion for application to a screen for silk screen imaging comprising an emulsion in water of

(a) polyvinyl alcohol at a level of between about 5 and about 15 weight percent of said emulsion,
(b) polyvinyl acetate and/or a polyvinyl acetate copolymer at a level of between about 15 and about 30 weight percent of said emulsion, the total polymer content of components (a) and (b) being in the range of from about 25 to about 35 weight percent of said emulsion,
(c) diacetone acrylamide at a level of between about 4 and about 16 weight percent of said emulsion, and
(d) an acrylic monomer at a level of between about 4 and about 8 weight percent of said emulsion, said emulsion having a solids content of between about 40 and about 50 weight percent, and having a viscosity of between about 20,000 and about 30,000 cps. at 25.degree. C., a thixotropic index of between about 1 and about 2 at 25.degree. C., and a specific gravity of between about 1 and about 1.25 at 25.degree. C.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 06/927,326Filed 5 Nov 1986 · continuation
Priority: 5 Mar 1985
Granted: 6 Dec 1988
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G03F 7/027
Photosensitive materials: non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
G03F 7/12
Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g.…
Y10S 430/11
Binder containing: vinyl alcohol polymer or derivative
G03F
Photomechanical production of textured or patterned surfaces