EP 0249752 B1 19901212 - LITHOGRAPHIC FOUNTAIN SOLUTION CONTAINING MIXED COLLOIDS
Title (en)
LITHOGRAPHIC FOUNTAIN SOLUTION CONTAINING MIXED COLLOIDS
Publication
Application
Priority
US 87494286 A 19860616
Abstract (en)
[origin: US4764213A] A lithographic fountain solution concentrate is disclosed, the essential components of which comprises an aqueous mixture of: (a) from about 0.1 to 1.5 percent by weight of a water soluble film forming hydrophilic gum; (b) from about 0.75 to about 8.5 percent by weight of Polyvinyl Pyrrolidone; (c) from about 5.0 to about 30.0 percent by weight of a water soluble acid etchant; (d) from about 20.0 to about 50.0 percent by weight of a water soluble or water miscible glycol; and (e) from about 0.01 to about 1.25 percent by weight of a phosphate/phosphoric acid buffer system. The concentrate is adapted for further dilution by water to yield a fountain solution which when used in the printing process offers decreased scumming and blinding of printing plates while at the same time permitting a reduction in the amount of water applied to the plate. Improved print quality, reduced tendency to wet the paper, faster ink drying and improved ink/water balance is thereby achieved.
IPC 1-7
IPC 8 full level
B41N 3/08 (2006.01)
CPC (source: EP US)
B41N 3/08 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0249752 A2 19871223; EP 0249752 A3 19880330; EP 0249752 B1 19901212; CA 1296119 C 19920218; DE 3766656 D1 19910124; JP S634993 A 19880109; US 4764213 A 19880816
DOCDB simple family (application)
EP 87107136 A 19870518; CA 539685 A 19870615; DE 3766656 T 19870518; JP 14718387 A 19870615; US 87494286 A 19860616