HEAT SEALABLE BARRIER COATING
First Claim
Patent Images
1. A heat sealable water-based coating composition comprising:
- a) 5 wt % to 90 wt % one or more acrylic polymer or copolymer emulsions;
b) 2 wt % to 25 wt % one or more melting waxes; and
c) 5 wt % to 85 wt % water;
wherein the heat sealable water-based coating composition is compostable.
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Abstract
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.
6 Citations
34 Claims
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1. A heat sealable water-based coating composition comprising:
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a) 5 wt % to 90 wt % one or more acrylic polymer or copolymer emulsions; b) 2 wt % to 25 wt % one or more melting waxes; and c) 5 wt % to 85 wt % water; wherein the heat sealable water-based coating composition is compostable. - View Dependent Claims (2, 3, 5, 6, 8, 9, 10, 12, 14, 15, 17, 18, 19, 21, 25, 26, 27, 32, 34)
wherein the heat sealable barrier coating is compostable.
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15. The method of claim 14, wherein the substrate is a cellulosic substrate.
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17. The method of claim 14, wherein multiple layers of the heat sealable water-based barrier coating are applied to the substrate.
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18. The method of claim 14, wherein the coating is applied by gravure printing, flexographic coating, curtain coating, flood coating, or Meyer bar application.
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19. The method of claim 14, wherein the coating is applied at a dry coating weight of 2 g/m2 to 15 g/m2.
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21. The method of claim 14, wherein the coating composition is applied to the first surface of the substrate as a flood coat, then the coating is applied to the second surface in registration so as to leave the sealing edges of the second surface uncoated to allow wax penetration into the seal.
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25. The method of claim 14, further comprising applying a coating to the substrate that is wax-free.
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26. A heat sealed substrate prepared by the method of claim 14.
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27. The substrate of claim 26, wherein the substrate is resistant to water, grease, and oil.
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32. The substrate of claim 26, wherein the substrate is compostable;
- and/or wherein the substrate is repulpable.
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34. The substrate of claim 9, wherein the substrate is compostable;
- and/or wherein the substrate is repulpable.
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Specification