Polaroid Corporation

Polaroid Corporation, Patent Dept.

Charles I Sullivan

Lloyd D Taylor

William C Schwarzel

Stanley J Jasne

Stanley F Bedell

Photographic diffusion transfer film units including polymeric diffusion control layers are disclosed. The diffusion control layers comprise polymers which are hydrolyzable in an alkaline medium so as to convert a layer comprising one or more of the polymers from a condition of impermeability to alkali or materials soluble in or solubilized by an aqueous alkaline processing composition to a condition of substantial permeability thereto.

Hydrolyzable diffusion control layers in photographic products

A diffusion control layer comprising a polymerization product of a monomer capable of undergoing .beta.-elimination in an alkaline environment is disclosed for use in diffusion transfer film units, as an interlayer or overcoat in photosensitive elements, or as a timing layer or overcoat in image-receiving elements.

Polymeric matrix containing .beta.-eliminating polymer and process for

Diffusion control layers in diffusion transfer photographic products

A relatively thin, flat or planar battery is disclosed which includes one or more cells in series relationship each comprising a planar anode in superposed relationship with a planar cathode and a separator disposed intermediate and extending substantially coextensive the facing surfaces of the anode and cathode possessing marginal portions and an aqueous electrolyte permeable central portion. Each cell includes an aqueous electrolyte disposed in the central portion of the separator and in contact with the facing surfaces of both the anode and the cathode and an electrically nonconducting polyacrylate sealant extending intermediate and providing adhesive contact between the marginal portions of the separator and next adjacent facing surfaces.

Novel battery assembly

A .beta.-eliminating graft copolymer useful as a diffusion control layer in film units adapted for diffusion transfer processes is disclosed.

Graft copolymers as diffusion control layers in photographic diffusion

A planar primary battery particularly suited for photographic application characterized in exhibiting high current drain capacities and improved manufacturability. The battery structure incorporates at least one electrode present in aqueous slurry form as a particulate dispersion of active material and poly(2-acrylamido-2-methylpropanesulfonic acid) in combination with electrolyte.

Flat battery with novel slurry form electrode

As a novel composition of matter, a copolymer of 2-acrylamido-2-methylpropane sulfonic acid and a vinyl aminimide.

2-Acrylamido-2-methylpropane sulfonic acid vinyl aminimide/copolymer

A flat zinc anode useful in cells and batteries, e.g., Leclanche batteries, is produced by coating an electrically conductive substrate with a slurry of zinc dust and an aqueous polymer latex in which the polymer particles have been swollen by an alcohol. The amount of the polymer is about 0.5 to 5 weight percent based on the amount of zinc. The amount of polymeric binder is not sufficient to form a continuous film but rather forms an adhesive mass which holds the zinc dust particles in place. Many polymers are suitable for use as binders, and it is presently preferred to employ, e.g., soft vinyl polymers, acrylates, or elastomers which do not react with zinc to impair battery performance or stability of the mix.

Method for producing zinc anode

A flat zinc anode useful in cells and batteries, e.g., Leclanche batteries, is produced by coating an electrically conductive substrate with a slurry of zinc dust and an aqueous polymer latex in which the polymer particles have been swollen by an alcohol. The amount of the polymer is about 0.5 to 5 weight per cent based on the amount of zinc. The amount of polymeric binder is not sufficient to form a continuous film but rather forms an adhesive mass which holds the zinc dust particles in place. Many polymers are suitable for use as binders, and it is presently preferred to employ, e.g., soft vinyl polymers, acrylates, or elastomers which do not react with zinc to impair battery performance or stability of the mix.

Growing community of inventors

Melrose, MA, United States of America

Charles I Sullivan