Printing ink emulsion
OwnerRonald F. DeSanto, Jr., Sam S. Carava +1inventors
InventorsRonald F. DeSanto, Jr., Sam S. Carava, Harold B. Parkinson
Life of this patent
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Abstract
A printing ink emulsion system containing an oil-base phase and water-miscible phase and exhibiting a high degree of stability against phase separation in use. The composition contains a small amount of phosphoric acid as a stabilizer, and is characterized in that the printing emulsion functions effectively as a single-application-step formulation in which the ink is retained only by the image portion of a plate, thus obviating the need for a separate operational step in which water is applied to a non-image area of a printing plate or roller to render that area ink-repellant.
Claims5
In a printing ink composition functioning effectively in a single-formulation, single-application-step printing process and obviating a need for applying successive coatings, including obviating a need for a separate water coat to be applied to a non-image portion of a printing plate,
- said composition comprising an emulsion and including an ink varnish resin dispersed in an oil-compatible phase of said composition,
- color-imparting means coloring said ink composition and selected from the group consisting of dyes, inorganic pigments, organic pigments and mixtures thereof,
- a polyol,
- water,
- a non-aqueous diluent, and
- an inorganic acid,
- the improvement wherein said diluent comprises emulsion-promoting and stabilizing means including a petroleum fraction,
- said emulsion-promoting and stablilizing means being present in said composition in a concentration in a range of from about 0.5% to about 7% by weight of said ink composition,
- wherein said inorganic acid is phosphoric acid present in said composition in a concentration of less than about 2% by weight of said ink composition, and
- wherein said water is present in a concentration of up to about 21% by weight of said ink composition.
The method of preparing a monolithographic ink exhibiting minimized solvent evaportion and possessing high mechanical stability for use in a printing process,
- said process being operable as a single-formation, single-application-step in which the use of a separate water coat applied to a non-print area is obviated,
- said method comprising the steps of:
- charging a mixing vessel with an oil-base ink varnish formulation including a resin selected from the group consisting of oleoresins, modified hydrocarbon resins, ester resins, boiled linseed oil, and mixtures thereof, and with phosphoric acid, and a glygol to provide an ink vehnicle,
- dispering a color-imprinting agent together with an additional ink varnish throughout the varnish formulation to provide an ink,
- blending a hydrocarbon into the ink while agitating, to establish an ink emulsion of controlled stability.
The method of preparing a composite composition lithographic printing ink formulation useful in carrying out, as a single-application-step, the coating of a printing plate to define image-producing areas and non-image areas on the printing plate, and eliminating a need for a separate water phase application step, said method including the steps of:
- preparing a homogeneous mixture of ink varnish resins including boiled linseed oil and adding phosphoric acid and ethylene glycol thereto, combining the resinous phase with additional varnish resin compositions and a color-imparting agent, to provide a modified varnish base constituting an ink vehicle,
- adding a hydrocarbon solvent to the ink vehicle with agitation to provide a stable ink emulsion.
A printing ink base functioning effectively in a single-formulation, single-application-step printing process and obviating a need for applying successive coatings, including obviating a need for a separate water coat to be applied to a non-image portion of a printing plate,
- said composition comprising an emulsion and including an ink varnish resin dispersed in an oil-compatible phase of said composition,
- a polyol,
- water,
- a non-aqueous diluent, and
- an inorganic acid,
- said diluent comprising emulsion-promoting and stabilizing means including a petroleum fraction,
- said emulsion and stabilizing means being present in said composition in a concentration in a range of from about 0.5% to about 7% by weight of said ink composition, and
- wherein said inorganic acid is phosphoric acid present in said composition in a concentration of less than about 2% by weight of said ink composition, and wherein said water is present in a concentration up to about 21% weight of said ink composition.
Dependencies are inferred from the claim text.