New types of modified gelatins are disclosed, modified at part of the free carboxyl groups of the polypeptide chain, by the introduction of a new end-standing amino, sulphinic acid or thiol group. The modified gelatins show an enhanced reactivity towards vinylsulphonyl hardeners. The invention further includes hardened modified gelatin types and hydrophilic elements containing them. In particular, a differentially hardened multilayer element, preferably a photographic element, is disclosed.
本文公开了新型改性明胶,通过引入新的末端
氨基、
亚硫酸或
硫醇基团,对
多肽链的部分游离羧基进行改性。改性明胶对
乙烯基磺酰基硬化剂的反应性增强。本发明还包括硬化改性明胶类型和含有它们的亲
水元件。特别是,本发明公开了一种不同硬化的多层元件,最好是一种照相元件。