| abstract |
Compounds of the formula (CH2 = CH-SO2-CH2-CH2-CO-A)n P, wherein each A, which may be either the same or different, is selected from direct bond, -NH- and -O-, P represents an n-valent aliphatic moiety which can be interrupted by a nitrogen atom or phenylene radical, and n is 3 or 4, provided that when A is direct bond the nitrogen atom interrupting said aliphatic moiety can be connected through the direct bond, can be effectively used as gelatin hardeners in gelatin-containing photographic layers. Examples of the compounds include 1,1,3,3-tetrakis(vinylsulfonylpropionamido)propane, alpha , alpha '-tetrakis(vinylsulfonylpropionamido)-p-xylene, 1,2,3-tris[ beta -(vinylsulfonyl)propionyloxy]propane, N,N',N''-tris[ beta -(vinylsulfonyl)propionyl]diethylenetriamine, and tetrakis[ beta -(vinylsulfonyl)propionyloxymethyl]methane. |