公开(公告)号：US4820613A

公开(公告)日：1989-04-11

申请号：US79081

申请日：1987-07-29

申请人： Joan T. Vermeersch ,  Hubert Vandenabeele ,  Jacques L. Vervecken ,  Daniel M. Timmerman

发明人： Joan T. Vermeersch ,  Hubert Vandenabeele ,  Jacques L. Vervecken ,  Daniel M. Timmerman

IPC分类号： G03C1/04 ,  G03C1/30

CPC分类号： G03C1/303 ,  G03C1/04

摘要： The present invention provides a method of hardening a proteinaceous surface layer of a photographic silver halide element by incorporating a dextran derivative in said proteinaceous surface layer, said dextran derivative being the reaction product of dextran and an epihalohydrin. The invention also provides a photographic element comprising at least one silver halide emulsion layer and at least one proteinaceous surface layer comprising the reaction product of dextran and an epihalohydrin.