Konishiroku Photo Industry Co., Ltd.

Hisashi Yamaguchi

Takashi Sasaki

Tsuneo Wada

Teiji Habu

Hiroki Ishii

Takayoshi Omura

Syoji Matsuzaka

Hiroyuki Inokuma

Toshifumi Iijima

Toshihiko Yagi

Sadatugu Terada

Akio Suzuki

Takeo Koitabashi

Masao Ishihara

Masatoshi Iwata

Shigemasa Itoh

Norio Chiba

Koichi Horigome

Masayuki Matsumoto

Hideyuki Anzai

Mikio Miura

Takayoshi Ohmura

The present invention is to provide a method for uniforming a group of silver halide particles of a silver halide emulsion to be used in a silver halide photographic light-sensitive material into a group of particles which is monodispersive and whose crystal habit is tetradecahedral or octahedral so that the complication and instabilization of the conventional particles can be reduced to be processed. Namely, in a process for growing particles in which a water-soluble silver salt is added to a core emulsion and a silver halide is produced to add to the core, this method is to adjust the pAg values of an emulsion being applied to the abovementioned process to increase by not less than 0.3 multistepwise or continuously.

Method for the production of silver halide emulsion

A silver halide light-sensitive photographic material for radiographic use comprising a transparent support and a silver halide emulsion layer on both sides thereof such that the blue light transmission density difference between the support and the silver halide layer is .gtoreq.0.35 and .ltoreq.0.60.

Silver halide light-sensitive photographic material for radiographic use

An antistatic light-sensitive silver halide photographic element having an addition copolymer of glycidol and ethylene oxide with a phenol-aldehyde condensate as the antistatic agent, is described.

Antistatic light-sensitive silver halide photographic element

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

This invention relates to a method of hardening gelatin which is accomplished by combining a compound containing at least one carbo-di-imide group with a compound having at least two vinyl sulfonyl groups. This combination has application to the photographic industry by providing a method of hardening the type of gelatin which is used in a gelatin -- containing photographic layer of a light-sensitive halide photographic material.

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

Hisashi Yamaguchi