US Patent 10562659 Heat sealable barrier coatings for paperboard

A paperboard blank and cup made therefrom are provided. The blank includes a paperboard substrate having a first side and a second side. A first polymer layer can be disposed on at least a portion of the first side of the paperboard substrate, and a second polymer layer can be disposed on at least a portion of the second side of the paperboard substrate. Both the first and second polymer layers can include at least one polymer component that is thermoplastic. The second polymer layer further comprises at least one polymer component, which is not present in the first polymer layer, and has a glass transition temperature higher than all the polymer components of the first polymer layer.