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US 5,308,388 AGranted
Fountain solution for offset printing
AssigneeHoechst Aktiengesellschaft
InventorLoni Schell
Life of this patent
Estimating the term…
Abstract
A fountain solution and a fountain solution concentrate for use in offset printing are disclosed. The ready-to-use solution comprises 0.001 to 0.08% by weight of at least one alkanol or alkenol or of an alkanediol or alkenediol having 5 to 15 carbon atoms, which has been converted with ethylene oxide and/or propylene oxide into polyether structures having 3 to 12 ethylene oxide units and/or propylene oxide units.
Claims14
A fountain solution for offset printing consisting essentially of:
- water;
- about 0.001 to 0.08% by weight of at least one polyether surfactant selected from the group consisting of C.sub.5 -C.sub.15 -alkanols, C.sub.5 -C.sub.15 -alkenols, C.sub.5 -C.sub.15 -alkanediols and C.sub.5 -C.sub.15 -alkenediols which have been ethoxylated or propoxylated, the polyether surfactant having 3 to 12 units selected from the group consisting of ethylene oxide units and propylene oxide units and having an HLB value of more than 8;
- at least one pH-adjusting substance selected from the group consisting of an organic acid, a salt of an organic acid and a buffer, said pH-adjusting compound being present in an amount sufficient to produce a pH of between 4 and 6 in the fountain solution;
- and
- optionally at least one additive selected from the group consisting of water-soluble organic solvents having a boiling point above about 100.degree. C. and a flash point above about 21.degree. C., humectants, water-soluble polyers, corrosion inhibitors, chelate formers, preservatives, dyes and antifoams
- wherein said fountain solution is hydrotrope-free.
3 more elements
Dependencies are inferred from the claim text.