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AssigneeGraphic Arts Technical Foundation
InventorThomas A. Fadner
Estimating the term…
A fountain solution for use with a lithographic offset printing press is prepared by admixing fountain etch constituents, water and between about 0.5 and 5 percent by volume of a substitutive additive for isopropyl alcohol. The additive or replacement may be a Carbitol or Cellosolve derivative or mixtures of Cellosolve or Carbitol derivatives, such as phenyl glycol ethers or other organic non-ionic compounds, as for example, n-hexoxyglycol (n-hexyl Cellosolve), n-hexoxydiethylene glycol, (n-hexyl Carbitol), 2-ethyl-1,3-hexanediol, n-butoxyethylene glycolacetate, n-butoxy-diethyleneglycolacetate, and 3-butoxy-2 propanol. The fountain solution free is isopropyl alcohol does not have the adverse toxic and flammable properties of prior art fountain solutions containing isopropyl alcohol.
An isopropyl alcohol-free fountain solution consisting essentially of, between about 0.5 and 5 percent by volume of one or more compounds selected from a group of non-ionic compounds having less than about 20 percent solubility in water at from about 15.degree.-35.degree. C., the solubility of water in said compounds being not less than about equal to said compounds solubility in water, said non-ionic compounds being miscible with printing inks and having a surface tension value less than about 40 to 50 dynes/cm and having a vapor pressure value less than about 5 mm Hg at 15.degree. to 35.degree. C., said non-ionic organic compounds being present within about 5 weight percent of said non-ionic organic compound water solubility limit at the dampening solution temperature, said non-ionic compounds having a molecular weight of between 100 and 300 gm/mole, said non-ionic organic compounds having a solubility in water to transport sufficient quantities of water to inked surfaces and efficiently renew the water at the surfaces of an inked plate, and
An isopropyl alcohol-free fountain solution consisting essentially of, between about 0.5 and 5 percent by volume of one or more compounds selected from a group of non-ionic compounds consisting essentially of n-hexoxyethylene glycol (n-hexyl Cellosolve), n-hexoxydiethylene glycol (n-hexyl carbitol), 2-ethyl-1,3-hexanediol, n-butoxyethylene glycolacetate, n-butoxydiethyleneglycolacetate, 3-butoxy-2-propanol and mixtures thereof, said non-ionic compounds being miscible with printing inks and having a surface tension value less than about 40 to 50 dynes/cm and having a vapor pressure value less than about 5 mm Hg at 15.degree. to 35.degree. C., said non-ionic organic compounds being present within about 5 weight percent of said non-ionic organic compound water solubility limit at the dampening solution temperature, said non-ionic compounds having a molecular weight of between 100 and 300 gm/mole, said non-ionic organic compounds having a solubility in water to transport sufficient quantities of water to inked surfaces and efficiently renew the water at the surfaces of an inked plate, and
Dependencies are inferred from the claim text.