초록 ▼

Pods for holding photographic solutions have strong edge seal areas and relatively weaker edge seal areas which are designed to break open when pressure is applied to the pod for releasing a photographic solution onto a sheet of paper or film. The weak seal is formed by applying a strip along an edg

Pods for holding photographic solutions have strong edge seal areas and relatively weaker edge seal areas which are designed to break open when pressure is applied to the pod for releasing a photographic solution onto a sheet of paper or film. The weak seal is formed by applying a strip along an edge of a thermoplastic material which is a crosslinked homopolymer or copolymer of 2-acetoacetoxyethyl methacrylate. The homopolymer can be crosslinked by heat, or by the action of formaldehyde, glyoxal, glutaraldehyde, or ethylene diamine. The 2-acetoacetoxyethyl methacrylate also can be copolymerized with a 2-norbornylmethyl ester of methacrylic acid and then crosslinked.

대표청구항 ▼

In a container for a fluid photographic processing material including aromatic alcohol comprising a pair of opposed walls marginally sealed together over a substantial area to provide an internal cavity adapted to retain such material, at least one of said walls being flexible and deformble, the int

In a container for a fluid photographic processing material including aromatic alcohol comprising a pair of opposed walls marginally sealed together over a substantial area to provide an internal cavity adapted to retain such material, at least one of said walls being flexible and deformble, the internal surfaces of said walls bounding said cavity comprising a polymer which resists deterioration by the action of such processing material, said opposed walls being marginally sealed together over a first part of said area polymer-to-polymer, and a polymeric sealing composition interposed between said opposed walls over a second part of said area forming a seal of less strength then the seal over said first part of said area, whereby said container preferentially opens along said second part of said area upon the application of pressure to said container, the improvement wherein: said polymeric sealing composition consists essentially of crosslinked homopolymer or copolymer of an acrylic acid ester having the formula: [Figure] , said homopolymer or copolyMer prior to being crosslinked having an inherent viscosity in benzene or chloroform measured at a concentration of 0.25 g/deciliter of solution at 25°C ranging from about 0.2 to 1, said seal formed by said polymeric sealing composition between said opposed walls being substantially resistant to changes in burst strength of said seal during storage of said container.