초록 ▼

A composite film bag 1 for packaging comprises a composite film of a water-insoluble film 2 and a water-soluble polyvinyl alcohol film 3 which are adhered to one another to such an extent that the former film 2 can easily be peeled off from the latter film 3 and which are formed into a bag so that t

A composite film bag 1 for packaging comprises a composite film of a water-insoluble film 2 and a water-soluble polyvinyl alcohol film 3 which are adhered to one another to such an extent that the former film 2 can easily be peeled off from the latter film 3 and which are formed into a bag so that the water-insoluble film 2 serves as an outer layer of the bag and the water-soluble polyvinyl alcohol film 3 serves as an internal layer thereof. A powdery or liquid agricultural chemical agent 6 is packed in the composite film bag 1 and the opening of the bag is sealed. Upon practical use, the outer water-insoluble film 2 is peeled off to expose the internal film 3 and the internal film 3 as such, while containing the agricultural chemical agent 6, is introduced into water. Thus, the internal film is dissolved in water and in turn the content 6 thereof is released and accordingly dissolved in water. The composite film bag 1 is not broken at all even when it is exposed to a low temperature condition.

대표청구항 ▼

A bag of a composite film for packaging comprising a composite film of a water-insoluble film and a water-soluble polyvinyl alcohol film which are adhered to one another with adhesive comprising acrylic polymer resin polymerized with monomers of at least one member selected from the group consisting

A bag of a composite film for packaging comprising a composite film of a water-insoluble film and a water-soluble polyvinyl alcohol film which are adhered to one another with adhesive comprising acrylic polymer resin polymerized with monomers of at least one member selected from the group consisting of methacrylate, acrylate, methyl methacrylate, methyl acrylate, ethyl methacrylate, ethyl acrylate, propyl methacrylate, propyl acrylate, butyl methacrylate, butyl acrylate, hydroxyethyl methacrylate, hydroxyethyl acrylate, hydroxypropyl methacrylate and hydroxypropyl acrylate and followed by crosslinking with a melamine prepolymer or a prepolymer having an isocyanate group, so that the water-insoluble film is peelable from the polyvinyl alcohol film, and which are formed into a bag so that the polyvinyl alcohol film serves as an internal layer of the bag and the water-insoluble film serves as an outer layer of the bag.