Solvent-based compostable cold seal release lacquer
AssigneeSun Chemical Corporation
InventorsCraig Boyd, Gina Chavez, Mackensey Fagan
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Abstract
The present invention provides solvent-based compostable cold seal release lacquers for use in packaging structures. The lacquers of the invention comprise resins, such as polyamide resins, comprising greater than 90% biobased carbon, generally prepared from renewable sources, e.g., plants such as rice. The present invention also provides the use of the inventive compostable lacquers as cold seal release lacquers in cold seal packaging, along with eco-friendly packaging film, etc., and has the potential to make the cold seal packaging fully compostable.
Claims22
A solvent-based cold seal release lacquer comprising:
- a) one or more solvents;
- b) from 20 wt % to 70 wt % of one or more polyamide resins comprising greater than 90% biobased carbon, reported as a percentage of the total carbon that is carbon derived from plant or animal by-products;
- and
- c) from 0.25 wt % to 5 wt % of one or more waxes, wherein the one or one or more waxes comprise greater than 70% biobased carbon, reported as a percentage of the total carbon that is carbon derived from plant or animal by-products;
- wherein the cold seal release lacquer has a static coefficient of friction (CoFstatic) of 0.35-0.50;
- a kinetic coefficient of friction (CoFkinetic) of 0.20-0.35;
- wherein the cold seal release lacquer, when dried, comprises greater than 90% biobased carbon, reported as a percentage of the total carbon that is carbon derived from plant or animal by-products and meets the ASTM D6400 standard for compostability, wherein equal to or greater than 90% of the biobased carbon converts to CO2 within 180 days of composting;
- and wherein the cold seal release lacquer comprises from 0 to 1 wt % water.
A structure comprising a substrate, a cohesive and a solvent-based cold seal release lacquer comprising:
- a) one or more solvents;
- b) from 20 wt % to 70 wt % of one or more polyamide resins comprising greater than 90% biobased carbon, reported as a percentage of the total carbon that is carbon derived from plant or animal by-products;
- and
- c) from 0.25 wt % to 5 wt % of one or more waxes;
- wherein the cold seal release lacquer has a static coefficient of friction (CoFstatic) of 0.35-0.50;
- a kinetic coefficient of friction (CoFkinetic) of 0.20-0.35;
- wherein the cold seal release lacquer, when dried, comprises greater than 90% biobased carbon, reported as a percentage of the total carbon that is carbon derived from plant or animal by-products and meets the ASTM D6400 standard for compostability, wherein equal to or greater than 90% of the biobased carbon converts to CO2 within 180 days of composting;
- and wherein the cold seal release lacquer comprises from 0 to 1 wt % water.
A method of providing a compostable cold seal structure comprising the steps of:
- applying a compostable adhesive to a surface of a compostable packaging substrate, and applying a solvent-based compostable cold seal release lacquer to a second surface of the same substrate or a surface of a second compostable packaging substrate, wherein the cohesive and compostable cold seal release lacquer form a seal under pressure, which seal is readily opened, wherein a solvent-based compostable cold seal release lacquer comprises:
- a) one or more solvents;
- b) from 20 wt % to 70 wt % of one or more polyamide resins comprising greater than 90% biobased carbon, reported as a percentage of the total carbon that is carbon derived from plant or animal by-products;
- and
- c) from 0.25 wt % to 5 wt % of one or more waxes;
- wherein the cold seal release lacquer has a static coefficient of friction (CoFstatic) of 0.35-0.50;
- a kinetic coefficient of friction (CoFkinetic) of 0.20-0.35;
- wherein the cold seal release lacquer, when dried, comprises greater than 90% biobased carbon, reported as a percentage of the total carbon that is carbon derived from plant or animal by-products and meets the ASTM D6400 standard for compostability, wherein equal to or greater than 90% of the biobased carbon converts to CO2 within 180 days of composting;
- and wherein the cold seal release lacquer comprises from 0 to 1 wt % water.
The structure according to 4, wherein the one or more solvents are chosen from the group consisting of alcohols, aliphatic solvents, glycol ethers and blends thereof.
The structure according to 14, wherein the one or more polyamide resins are derived from rice oil or rice bran and/or wherein the one or more polyamide resins are compostable.
Dependencies are inferred from the claim text.