Patent ID: 11932776
Assignee: SUN CHEMICAL CORPORATION
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 12:
13. 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.