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US 12,662,599 B2Granted
Modified overprint varnish
AssigneeToppan Thermoformed Packaging Holdings, Inc.
InventorRichard Schwarz
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Abstract
In an embodiment, the invention comprises a thermoformable sheet which comprises a polymer layer, and a barrier layer disposed adjacent the polymer layer. The barrier layer comprises a plurality of particles coated in an adhesion promotor. The plurality of coated particles are dispersed in a barrier solution of polyvinyl alcohol.
Claims14
A method of forming a modified over print varnish, the method comprising:
- coating a moisture resistant agent selected from talc, wax, or silicon dioxide with a fatty acid;
- dispersing the coated moisture resistant agent in an over print varnish comprising a water-based emulsion of polymeric droplets;
- mixing the coated moisture resistant agent and the over print varnish to form a mixture, wherein the fatty acid coating prevents a disruption of the water-based emulsion of polymeric droplets during mixing;
- and
- drying the mixture to evaporate at least some of the water from the over print varnish to form a continuous film with the coated moisture resistant agent entrapped therein, wherein the modified over print varnish provides resistance to both oil and water transfer.
2 more elements
Dependencies are inferred from the claim text.