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US 5,474,818 AGranted
Flexible container with nonstick interior
AssigneeInternational Paper Company
InventorsHelga H. Ulrich, James R. Quick, Barry L. Hess
Life of this patent
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AssigneeInternational Paper Company
InventorsHelga H. Ulrich, James R. Quick, Barry L. Hess
Estimating the term…
A pouch suitable for packaging disposable consumer products having a pressure sensitive adhesive coated on a portion of a surface thereof. The pouch is formed from a silicone polymer coated paper with the silicone coating forming an internal surface of the pouch, thereby allowing easy removal of the product from the pouch and avoiding permanent sticking of the pressure sensitive adhesive coating to the pouch material. The silicone polymer coated paper used to form the pouch has, as a part of the composition thereof, a thermoplastic component which can be a thermoplastic basecoat, or an admixed thermoplastic polymer included in the silicone polymer coating, or a thermoplastic coating on the surface of the paper opposite the silicone coating, or combinations of these alternatives. In all cases, the thermoplastic component is provided in the form of a water-based emulsion or dispersion of a thermoplastic polymer, such as an emulsion of an ethylene vinyl acetate copolymer. The pouch is sealed along at least one edge where two layers of material are joined, the inward facing surface of at least one of the layers being silicone coated. The edge seal is formed by a process that provides simultaneous heating and embossing effects in the seal area.
A flexible container in the form of a pouch, a bag, or an envelope, said container being formed at least partially from a silicone polymer coated paper, said silicone polymer coated paper comprised of a paper substrate having a first surface and a second surface, a silicone polymer coating on said first paper surface, a thermoplastic coating on said second paper surface, said thermoplastic coating applied to said second paper surface as a water-based emulsion or dispersion of a thermoplastic polymer, said silicone polymer coating on said first paper substrate surface forming a nonstick internal surface of said flexible container, said flexible container having at least one embossed side seam where a seal is formed joining two overlapped edge zones, at least one of said two overlapped edge zones including said nonstick internal surface.
A flexible container in the form of a pouch, a bag, or an envelope, said container being formed at least partially from a silicone polymer coated paper, said silicone polymer coated paper comprised of a paper substrate having a first surface and a second surface, a thermoplastic basecoat on said first paper substrate surface, said thermoplastic basecoat coating applied to said first paper substrate surface as a water-based emulsion or dispersion of a thermoplastic polymer, a silicone polymer coating on said thermoplastic basecoat, said silicone polymer coating forming a nonstick internal surface of said flexible container, said flexible container having at least one embossed side seam where a seal is formed joining two overlapped edge zones, at least one of said two overlapped edge zones including said nonstick internal surface.
A flexible container in the form of a pouch, a bag, or an envelope, said container being formed at least partially from a silicone polymer coated paper, said silicone polymer coated paper comprised of a paper substrate having a first surface and a second surface, a silicone polymer coating on said first paper substrate surface, a thermoplastic polymer included in said silicone polymer coating, said silicone polymer coating and said thermoplastic polymer applied to said first paper surface as a water based emulsion or dispersion, said thermoplastic polymer being admixed with said silicone polymer coating, said silicone polymer coating forming a nonstick internal surface of said flexible container, said flexible container having at least one embossed side seam where a seal is formed joining two overlapped edge zones, at least one of said two overlapped edge zones including said nonstick internal surface.
Dependencies are inferred from the claim text.