Ink for dry planographic printing
AssigneeGestetner Limited
InventorsLeonard A. Spicer, Derek J. McGee
Life of this patent
Estimating the term…
Abstract
The invention provides a novel ink for dry planographic printing. The new ink is based on a vehicle containing the reaction product of an oil-modified alkyd resin, a rosin-modified phenolic resin, and a diisocyanate and also a high viscosity silicone oil. The new ink can be used with planographic plates having an oleophobic surface and does not adhere to the non-image areas.
Claims8
An ink for dry planographic printing comprising a dispersion of pigment in a substantially non-aqueous vehicle comprising the reaction product of 40-65% of a drying oil or fatty acids derived therefrom, 4-24% of alkyd resin, 10-45% of rosin-modified phenolic resin, and 4-15% of diisocyanate, the percentages being by weight of the vehicle, the said ink having, finely and uniformly dispersed therein, 0.2 to 1% by weight of the ink of a silicone oil having a viscosity of at least 1000 centistokes at 20.degree. C. which is immiscible or only partly miscible with the said vehicle.
Dependencies are inferred from the claim text.