The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 1989
Filed:
Dec. 29, 1986
Eiichi Kato, Shizuoka, JP;
Shigeyuki Dan, Shizuoka, JP;
Hiroshi Ishibashi, Shizuoka, JP;
Kazuo Ishii, Shizuoka, JP;
Hidefuji Sera, Shizuoka, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
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.