Described and claimed is a primer coating, and polymeric film with the primer coating making the film suitable for moisture-resistent and retort packaging applications. The primer coating comprises a shellac component and a copolyester component, both of which are water-dissolvable or dispersible. The shellac component can include modified shellac resins such as shellac varnish, shellac-lacquer, or shellac copolymers.
描述和权利要求是一种底涂层和聚合物薄膜,底涂层使薄膜适用于防潮和蒸馏包装应用。底涂层包括一种
虫胶成分和一种共聚聚酯成分,这两种成分均可在
水中溶解或分散。
虫胶成分可包括改性
虫胶树脂,如
虫胶清漆、
虫胶漆或
虫胶共聚物。