US 5,221,330 AGranted

Concentrated dampening water composition for lithographic printing

AssigneeFuji Photo Film Co., Ltd.

InventorsHiroshi Matsumoto, Kenji Kunichika

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Abstract

A concentrated dampening water composition for lithographic printing comprises a) 0.1 to 10% by weight of a hydrophilic polymeric compound having a film-forming ability; b) 0.01 to 15%, by weight of a pH buffering agent; c) 5 to 80% by weight of a water-miscible organic solvent having a boiling point of not less than 140.degree. C. and whose 1% by weight aqueous solution has a surface tension of not more than 60 dynes/cm; d), 0.05 to 10% by weight of a compound, for instance, represented by the following general formula (III); and e) 30 to 80% by weight of water: R.sup.8 --Z.sup.1 (R.sup.9)(R.sup.10)--R.sup.7.X.sup.1 (III) wherein R.sup.7 to R.sup.10 each represents a C.sub.1-12 alkyl, cyclic alkyl, hydroxyalkyl, benzyl or substituted or unsubstituted phenyl group; Z.sup.1 represents N, P or B; X.sup.1 represents an anion or cation selected from the group consisting of halogen, nitrate, sulfate, phosphate, hydroxyl, PF.sub.6.sup.-, BF.sub.4.sup.-, Li.sup.+, Na.sup.+, K.sup.+ and NH.sub.4.sup.+. The composition shows good printing properties and does not impair image areas of printing plates although it comprises a high boiling point solvent. Further, it provides dampening water having excellent stability with time, satisfies the requirements stipulated in the Japanese Fire Services Act as well as Industrial Safety and Health Law and thus can steadily provide good copies.

A concentrated dampening water composition for lithographic printing comprising,

a) 0.1 to 10% by weight of a hydrophilic polymeric compound having a film-forming ability;
b) 0.01 to 15% by weight of a pH buffering agent;
c) 5 to 80% by a weight of a water-miscible organic solvent which is a combination of a compound represented by the following general formula (VII) and a compound represented by the following general formula (VIII):
R.sup.20 O--(--CH.sub.2 CH(R.sup.21)O--).sub.n --H (VII)
wherein R.sup.20 represents a hydrogen atom or a C.sub.1-4 alkyl group;
R.sup.21 represents a hydrogen atom or a methyl group;
and n is an integer ranging from 1 to 20;
R.sup.22 --C(R.sup.23)(OR.sup.24)--CH.sub.2 CH.sub.2 OH (VIII)
wherein R.sup.22 and R.sup.23 each represents a hydrogen atom or a C.sub.1-4 alkyl group and R.sup.24 represents a C.sub.1-4 alkyl group;
d) 0.05 to 10% by weight of at least one member selected from the group consisting of compounds represented by the following general formulas (I) to (VI);
and
e) 30 to 80% by weight of water:
##STR7## wherein R.sup.1, R.sup.2 and R.sup.3 may be the same or different and each represents a hydrogen or halogen atom or a C.sub.1-3 alkyl, C.sub.1-3 hydroxyalkyl or hydroxyl group;
R.sup.4, R.sup.5 and R.sup.4 may be the same or different and each represents a hydrogen or halogen atom or a C.sub.1-3 alkyl, mercapto, sulfo, hydroxyl or carboxyl group;
R.sup.7 to R.sup.10 and R.sup.16 to R.sup.19 each represents a C.sub.1-12 alkyl, C.sub.5-12 cyclic alkyl, C.sub.1-12 hydroxyalkyl, benzyl or substituted or unsubstituted phenyl group;
Z.sup.1 to Z.sup.3 each represents N, P or B;
X.sup.1 to X.sup.3 each represents an anion or cation selected from the group consisting of halogen, nitrate, sulfate, phosphate, hydroxyl, PF.sub.6.sup.-, Li.sup.+, Na.sup.+, K.sup.+ and NH.sub.4.sup.+ ;
n is an integer ranging from 1 to 5;
R.sup.11 and R.sup.12 each represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms;
R.sup.13 represents a hydrogen atom or a hydroxyl group;
R.sup.14 represents a hydrogen atom or a sulfo group;
R.sup.15 represents a hydrogen atom or a C.sub.1-6 alkyl or C.sub.1-6 hydroxyalkyl group;
and M.sup.1, M.sup.2, M.sup.3 and M.sup.4 each represents a hydrogen atom or an alkali metal or ammonium ion.

20 more elements

Abstract

Claims16