Mitsubishi Paper Mills Limited

Mamoru Nakatani

Kiyoshi Yamashita

Kosaku Masuda

Yasushi Usagawa

Satoshi Kawakatsu

Akira Furukawa

Akio Yoshida

Akira Tanaka

Eiji Kanada

Jun Yamada

Takao Senga

Hirokazu Yamamoto

Isao Kohmura

Shoichi Horii

Disclosed is a process of developing images formed on a photosensitive material for electrophotography which does not cause the fogging originated from a pair of squeeze rolls made of materials different from each other and which includes the steps of developing the images with a liquid developer of the positive type containing a compound having a polyoxyethylene group or at least one compound selected from the group consisting of phosphate, sulfate and sulfonate salts having a group soluble in the carrier liquid and free from polyoxyethylene group.

Method of developing electronic photograph with liquid developer and

A lithographic printing plate with a markedly improved printing endurance is obtained by the silver complex diffusion transfer process when the diffusion transfer development treatment is carried out in the presence of at least one thione compound having a non-enolizable thione group, an adjacent nitrogen atom with an attached substituent R and represented by &gt;N-R, and a group of atoms selected from carbon, nitrogen, oxygen and sulfur atoms which may carry the substituent R, said group of atoms being necessary for forming a 5- or 6-membered ring having no aromatic condensed ring, said substituent R having 1 to 3 carbon atoms or no carbon atom.

Method for making improved lithographic printing plate

Direct-positive photographic silver halide emulsion which contains a dye having a 5,6-dihydropyrrolo[2,1-a]isoquinoline ring is disclosed. Said emulsion has a high speed, produces high contrast images, has no color stain with any remaining dye after processing and causes only small depression in the maximum density.

Direct-positive photographic silver halide emulsion

The two-equivalent yellow coupler having the following formula has an extremely high reactivity, produces an image of high density in color development and causes little fogging and no ground coloration: ##STR1## wherein Coupl, R.sub.1 - R.sub.5 and A are as defined hereinafter.

Silver halide emulsion containing two-equivalent yellow coupler

A compound represented by the general formula A-Q (wherein A represents a yellow dye image-forming coupler residue having the active methylene group from which one hydrogen atom has been replaced and Q represents a tetrazolyl group substituted at the 5-position with hydrogen, a halogen, a cyano, an alkyl, an aralkyl, an aryl, an alkyl-amino or an arylamino group) is used as a yellow dye image-forming coupler for obtaining yellow dye images that have good spectral absorption characteristics, and good stability to prolonged exposure to light, heat and high humidity.

Silver halide emulsion containing two-equivalent yellow dye-forming

Growing community of inventors

Nagaokakyo, Japan

Mamoru Nakatani