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US 9,750,686 B2Granted
Laminated film and method for laminating films
AssigneeLotte Fine Chemical Co., Ltd.
InventorsSung Hwan Bang, Kyung Yeol Park, Jin Ryul Son, Jyung Hee Jeon, Ju Hee Shin, Sang Youb Lee
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Abstract
The inventive concept relates to a laminated film and a method of laminating films, and the disclosed laminated film includes at least two films sequentially stacked and bonded to each other, wherein each of the films may be each independently a gastric film or an enteric film.
Claims5
A laminated film comprising:
- at least a gastric film and an enteric film, wherein the gastric film is disposed on and bonded to a surface of the enteric film,
- wherein the gastric film comprises at least one selected from a water soluble entrapped material and a first poorly water soluble entrapped material,
- wherein the enteric film comprises a second poorly water soluble entrapped material,
- wherein the enteric film allows an aqueous medium to permeate therethrough, and
- wherein the first poorly water soluble entrapped material and the second poorly water soluble entrapped material are the same or different,
- wherein the laminated film is prepared by bonding a gastric film and an enteric film to each other by using an acidic solution as a medium, wherein the gastric film and the enteric film obtain surface adhesiveness when the films contact water,
- wherein the bonding comprises
- spraying the acidic solution on a first surface of one of the gastric film and the enteric film,
- disposing the other of the gastric film and the enteric film on the first surface, and
- compressing the gastric film and the enteric film to each other.
7 more elements
Dependencies are inferred from the claim text.