Fuji Photo Film Company, Limited

Hidefuji Sera

Eiichi Kato

Kazuo Ishii

Hiroshi Ishibashi

Shigeyuki Dan

A liquid developer for electrostatic photography is disclosed, comprising a non-aqueous solvent having electrical resistivity of not less than 10.sup.9 .OMEGA..cm and a dielectric constant of not more than 3.5 having dispersed therein at least a resin, wherein said resin is a copolymer resin obtained by subjecting a solution containing (A) at least one of monofunctional monomer which is soluble in said solvent but insolubilized upon polymerization and (B) at least one of monomers having at least two polar groups and/or polar linking groups represented by formula (I): ##STR1## wherein V, Y, R.sub.1, R.sub.2, X.sub.1, X.sub.2, a.sub.1, and a.sub.2 are defined in the specification, to a polymerization reaction in the presence of a resin which is soluble in said solvent and contains no graft group polymerizable with said monomers. The developer is excellent in dispersion stability, redispersibility and fixing properties and is capable of producing a master plate for offset printing having excellent ink sensitivity and printing durability.

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Shizuoka, Japan

Hidefuji Sera