Energy curable overprint varnish and coated product
AssigneeMichelman, Inc.
InventorNorman Seung
Life of this patent
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Abstract
An energy curable coating composition is provided for use as an overprint varnish on cellulosic, polymeric and metal substrates. The coating composition includes an epoxy acrylate, a triacrylate, and optionally, a diacrylate. The coating composition is applied to a substrate and cured by radiation to form a thermoformable protective coating. The coated substrate may then be thermoformed into a shaped food package or article.
Claims22
An energy curable coating composition for use on substrates comprising a mixture of:
- a) from about 20 to about 95% by weight of at least one epoxy acrylate selected from (i) a self-photoinitiating epoxy acrylate or (ii) an epoxy acrylate comprising about 85% by weight epoxy acrylate and about 15% by weight trimethylolpropane triacrylate;
- b) from about 0 to about 50% by weight of a diacrylate selected from dipropylene glycol diacrylate, neopentyl glycol diacrylate, tripropylene glycol diacrylate, silicone diacrylate, epoxy diacrylate, and combinations thereof;
- and
- c) from about 1 to about 55% by weight of a triacrylate selected from trimethylolpropane triacrylate, trimethylolpropane ethoxy triacrylate, and combinations thereof;
- wherein said coating composition, after coating on a substrate and curing, is thermoformable and exhibits barrier properties.
A method of forming a food package or article having an energy curable coating composition thereon comprising:
- providing a substrate having first and second major surfaces;
- applying an energy curable coating composition to at least one of said first and second major surfaces of said substrate;
- said coating comprising a) from about 20% to about 95% by weight of at least one epoxy acrylate selected from (i) a self-photoinitiating epoxy acrylate or (ii) a mixture of about 85% by weight of an epoxy acrylate and about 15% by weight trimethylolpropane triacrylate;
- b) from 0 to about 50% of a diacrylate selected from dipropylene glycol diacrylate, neopentyl glycol diacrylate, tripropylene glycol diacrylate, silicone diacrylate, epoxy diacrylate, and combinations thereof;
- and c) from about 1% to about 55% by weight of a triacrylate selected from trimethylolpropane triacrylate, trimethylolpropane ethoxy triacrylate, and combinations thereof;
- exposing said coating composition to radiation sufficient to cure said coating composition and form a coated substrate;
- and
- thermoforming said coated substrate into a shaped food package or article, wherein said thermoformed package or article exhibits barrier properties.
A coated and thermoformed package or article comprising a substrate having first and second major surfaces, with at least one of said major surfaces having coated thereon a cured coating comprising a) from about 20% to about 95% by weight of at least one epoxy acrylate selected from (i) a self-photoinitiating epoxy acrylate or (ii) an epoxy acrylate comprising about 85% by weight epoxy acrylate and about 15% by weight trimethylolpropane triacrylate;
- b) from 0 to 50% by weight of a diacrylate selected from dipropylene glycol diacrylate, neopentyl glycol diacrylate, tripropylene glycol diacrylate, silicone diacrylate, epoxy diacrylate, and combinations thereof;
- and c) from about 1 to about 55% by weight a triacrylate selected from trimethylolpropane triacrylate, trimethylolpropane ethoxy triacrylate, and combinations thereof.
Dependencies are inferred from the claim text.