DIMENSIONALLY STABLE PHOTOSENSITIVE ELEMENT

摘要

This invention provides a photosensitive element comprising a polyester support (9) at least 0.008 inch (0.2 mm) thick bearing on each side a polymeric water-vapor barrier layer (10,11) at least 0.00001 inch (0.25 mu m) thick of a copolymer of vinylidene chloride containing at least 80% by weight of vinylidene chloride and minor amounts of an alkyl acrylate and itaconic acid, and on the other side of a barrier layer (10), a layer of a photosensitive material (6), e.g. silver halide emulsion, diazo or photopolymer. The element in the form of a phototool limits dimensional change within 6 hours after exposure to a 5% Relative Humidity change to no more than 0.0001 cm per 24 cm.