Patent ID: 11932772
Assignee: TOPPAN PRINTING CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A water-resistant gas barrier film, consisting of a substrate film, which is a polyethylene terephthalate film or a polypropylene film, and a coating film disposed on the substrate film, wherein the coating film consists of:
(a) carboxy group-modified polyvinyl alcohol, (b) completely saponified polyvinyl alcohol having a polymerization degree of 3000 or less, and (c) polyethyleneimine, and wherein a mass ratio between the carboxy group-modified polyvinyl alcohol and a sum of the carboxy group-modified polyvinyl alcohol and the completely saponified polyvinyl alcohol in the coating film is from 0.02 to 0.4, wherein the water-resistant gas barrier film is a stretched film such that the substrate film and the coating film are stretched together in a first direction with a stretching ratio from 3-10 times, and wherein a content of the polyethyleneimine is from 1 mass % to 5 mass % with respect to a total mass of the coating film.