30-04-2020 дата публикации
Номер: US20200131708A1
The present invention provides a heat-sealable water-based coating composition suitable for coating substrates used for packaging of products that contain grease, oil, water, etc. The coating compositions comprise acrylic polymer or copolymer emulsions and melting waxes. The substrates may be formed into containers, such as cups, for example. The coatings provide a barrier that is resistant to the permeation of, for example, grease, oil, water, and other liquids. Furthermore, the coating compositions are compostable. 2. The composition of claim 1 , wherein the melting wax has a melting point of 40° C. to 100° C.3. The composition of claim 1 , wherein the one or more melting waxes are selected from the group consisting of paraffin wax claim 1 , acrylic-grafted paraffin wax claim 1 , crystalline wax claim 1 , polyethylene wax claim 1 , high density polyethylene wax claim 1 , polyethylene/polytetrafluorethylene wax claim 1 , carnauba wax claim 1 , and combinations thereof and/or wherein the one or more acrylic polymer or copolymer emulsions are selected from the group consisting of pure acrylic polymer claim 1 , ethylene acrylic acid copolymer claim 1 , vinyl acrylic acid copolymer claim 1 , styrene-acrylic copolymer claim 1 , and combinations thereof.4. (canceled)5. The composition of claim 1 , further comprising one or more additives selected from the group consisting of adhesion promoters claim 1 , light stabilizers claim 1 , de-gassing additives claim 1 , flow promoters claim 1 , defoamers claim 1 , antioxidants claim 1 , stabilizers claim 1 , wetting agents claim 1 , surfactants claim 1 , clays claim 1 , fillers claim 1 , dispersants claim 1 , plasticizers claim 1 , rheological additives claim 1 , other waxes claim 1 , silicones claim 1 , colorants claim 1 , and combinations thereof.6. The composition of claim 1 , wherein the coating composition is a barrier coating composition claim 1 , resistant to permeation of liquids and vapors.7. (canceled)8. The composition ...
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