초록 ▼

Laminated material sheets for packaging photographic materials, which comprise (a) a middle layer of a thermoplastic resin layer which contains any harmful substances adversely affecting photographic materials, (b) and outer layer having a higher gas-permeability and is photographically inactive com

Laminated material sheets for packaging photographic materials, which comprise (a) a middle layer of a thermoplastic resin layer which contains any harmful substances adversely affecting photographic materials, (b) and outer layer having a higher gas-permeability and is photographically inactive comprising a thermoplastic resin and/or a porous flexible sheet layer and (c) an inner layer which is less gas-permeable than said outer layer (b) and is photographically inactive comprising a thermoplastic resin layer, a flexible sheet layer or a laminated layer thereof. Formed articles like containers for like use comprised of said laminated materials. Any harmful substances contained in the thermoplastic resin of the middle layer (a) may diffuse out through the outer layer (b), or they do not almost migrate into the packaged photographic materials through the inner layer (c).

대표청구항 ▼

A formed container having light shielding ability for packaging photographic materials, said container having an inner surface fully enclosing the photographic material and being comprised of a laminated material comprising: (a) a middle layer of a thermoplastic resin layer which contains any harmfu

A formed container having light shielding ability for packaging photographic materials, said container having an inner surface fully enclosing the photographic material and being comprised of a laminated material comprising: (a) a middle layer of a thermoplastic resin layer which contains any harmful substances adversely affecting photographic materials, (b) a photographically inactive outer layer of a thermoplastic resin layer having gas-permeability, and (c) a photographically inactive inner layer which is at least coextensive with the middle layer for closer proximity to the photographic material than the middle and outer layers and having a lower gas-permeability than said outer layer (b) wherein the gas permeability of the outer layer is at least 1.2 times greater than the gas permeability of the inner layer, wherein at least one of the middle, outer and inner layers contains a light shielding substance.