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:
Oct. 08, 1991
Filed:
Sep. 12, 1989
Nobuo Suzuki, Kanagawa, JP;
Yutaka Sakasai, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A positively chargeable liquid developer to be used in making a printing plate by developing an electrostatic image formed on the surface of a printing plate precursor with a liquid developer and then by decoating the non-image area, the plate comprising a conductive base plate having provided thereon an electrophotographic photoreceptive layer, the liquid developer containing image forming particles comprising a resin which is prepared by copolymerizing monomers of formulae (I), (II) and (III) in a copolymerizing ratio of 0.1-9.9 : 90-99.8 : 0.1-10 by weight percent, the resin having a number average molecular weight ranging from 5.times.10.sup.3 to 5.times.10.sup.5 and a softening point ranging from 40.degree. C. to 150.degree. C.: ##STR1## (wherein R.sub.1, R.sub.1 ' and R.sub.1 ' each represents a hydrogen atom or a methyl group; R.sub.2 represents an straight-chain or branched alkyl group containing 4 to 22 carbon atoms; R.sub.3 represents a hydrogen atom or a straight-chain or branched alkyl group containing 1 to 4 carbon atoms; R.sub.4 represents ##STR2## Z and B each represents --(CH.sub.2).sub.n -- (n=1-4), but B may be absent from the group represented by R.sub.4 ; X.sup.- represents an anion; R.sub.5, R.sub.6 and R.sub.7 may be the same or different, each being a straight-chain or branched alkyl group containing 1 to 12 carbon atoms, or a hydrogen atom, and R.sub.8 has the same definition as R.sub.3).