Konishiroku Photo Industry Co., Ltd.

Takayoshi Omura

Takashi Sasaki

Tsuneo Wada

Teiji Habu

Hiroki Ishii

Hisashi Yamaguchi

Hiroyuki Inokuma

Masao Ishihara

Tugumoto Usui

Shinobu Korematsu

Masayuki Matsumoto

Masahide Tamura

Ryoichiro Kobayashi

Gelatin, especially in a layer of a light-sensitive silver halide photographic material, is hardened with the reaction product of a compound having at least three vinylsulfonyl groups in the molecule and a compound having at least one water-soluble group and at least one group capable of reacting with the vinylsulfonyl group, such as --SH, .dbd.NH and --NH.sub.2.

Gelatino silver halide photographic material hardened with a reaction

A method for adding oil-soluble photographic addenda in the form of their solution in a high boiling organic solvent to a hydrophilic colloidal solution for forming a layer of a light-sensitive silver halide photographic material in the homogeneously dispersed state, is described.

Method for the addition of photographic addenda

Gelatin, particularly gelatin films of light-sensitive silver halide photographic materials, are hardened by treating with a combination of a compound having at least two vinylcarbonyl groups in the molecule with a compound having at least two vinylsulfonyl groups in the molecule.

Method for hardening gelatin

A process for hardening gelatin which comprises reacting photographic gelatin with a compound of the general formula

Gelatin hardening process

A process for hardening gelatin which comprises reacting photographic gelatin with a compound of the general formula ##SPC1## Wherein R.sub.1 and R.sub.2 individually are halogen, an aryloxy group which may have substituents, or an arylthio group which may have substituents; X is a simple bond, an alkylene group which may have substituents --CO, --CO--R.sub.5 --CO-- (in which R.sub.5 is an alkylene group which may have substituents) or --R.sub.6 --(O--R.sub.6).sub.n -- (in which R.sub.6 is an alkylene group which may have substituents and n is a positive integer); an Y is a saturated or unsaturated hydrocarbon group which may have substituents, or a group ##SPC2## (in which R.sub.3 and R.sub.4 individually are halogen).

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Hino, Japan

Takayoshi Omura