Mitsubishi Paper Mills Limited

Tamotu Iwata

Shigeru Iguchi

Tetsuo Yano

Susumu Baba

Seiichi Sumi

Hideto Kiyama

Yukinao Kawamata

Disclosed is a method for developing silver halide photographic photosensitive materials with a developer containing a sulfite wherein said developer contains 20 mol % or more of potassium ion based on the total alkali metal ions, 0.04 mol/l or more of bromine ion or a compound represented by the following formula (I): ##STR1## wherein R.sub.1 represents a hydroxyalkyl group having 2-10 carbon atoms and R.sub.2 and R.sub.3 each represent a hydrogen atom, an alkyl group having 1-10 carbon atoms or a hydroxyalkyl group having 2-10 carbon atoms and the developer is filtered by a filter containing physical development nuclei before, during or after development of the photosensitive materials with the developer. The method is especially effective in processing using an automatic processor. According to the present method, formation of silver sludges is effectively inhibited and thus, stain of roll and belt of the processors can be prevented. According to the present method, formation of silver sludges is effectively inhibited and thus, stain of roll and belt of the processors can be prevented.

Method for photographic development using a filter to inhibit occurrence

The present invention provides a developer for silver halide photographic light-sensitive materials which provides super-high contrast and is improved in stability with time. This developer contains at least (1) a developing agent, (2) 10 g/l or more of a hydroquinonemonosulfonate, (3) 0.3 mol/l or more of a sulfite and (4) an amino compound in an amount necessary to accelerate enhancement of contrast and has a pH of 10.5-12.3.

Method for photographic development

A photographic binder prepared by heating a mixed aqueous solution of styrene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer and polyvinyl alcohol in acidic state makes it possible to coat a photographic coating liquid for forming photographic layers in the same manner as in the case of using gelatin and furthermore gives excellent physical properties to the resultant photographic layers.

Photographic binder mixture of three polymers

Photographic binder comprising isobutylene-maleic anhydride copolymer

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Nagaokakyo, Japan

Tamotu Iwata