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US 4,045,232 AGranted
Printing ink composition
AssigneeTopar Products Corporation
InventorHarold B. Parkinson
Life of this patent
Estimating the term…
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AssigneeTopar Products Corporation
InventorHarold B. Parkinson
Estimating the term…
An additive is provided which may be combined with printing inks to provide a printing ink composition which is retentive only by the image portion of a print plate. The additive includes a printing ink resin and a concentrated mineral acid. The additive may also include a polyhydric or monohydric alcohol or mixtures of such alcohols. A volatile solvent may also be present in the additive.
A modified ink vehicle for use in the preparation of printing ink compositions comprising a printing ink resin, a solvent and a strong mineral acid, said strong mineral acid being present at a level of from about 5 to about 20 cc per pound of resin, said printing ink resin being fluid and having a viscosity at room temperature in the range of from about Q to Z6 as determined by the Gardner-Holdt method, said strong mineral acid being selected from the group consisting of nitric acid and mixtures of nitric acid with sulphuric acid having at least about 50 percent by weight of nitric acid, said solvent being selected from the group consisting of turpentine, mineral spirits and short chain esters having a straight or branched chain aliphatic acid moiety of from 2 to 6 carbons and a straight or branched chain, aliphatic alcohol moiety of from 2 to 6 carbons.
A method of making modified ink vehicle for use in printing ink compositions comprising providing a printing ink resin, said printing ink resin being fluid and having a viscosity at room temperature in the range of from about Q to about Z6 as determined by the Gardener-Holdt method, acid treating said resin by adding a strong mineral acid selected from the group consisting of nitric acid and mixtures of nitric acid with sulphuric acid having at least 50 percent by weight nitric acid to said printing ink resin and maintaining the temperature of said resin and acid mixture in the range of from about 170.degree. F to about 200.degree. F so as to acid treat said resin with said acid, said strong mineral acid being added to said resin at a level of from about 5 to about 20 cc of acid per pound of resin.
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Printing inks: based on fatty oils
Coating compositions
Term ended 30 Aug 1994 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention relates generally to improvements in printing ink compositions and more particularly relates to providing an improved printing ink composition which may be used in a single step lithographic printing process without the necessity for applying moisture to the lithographic plate between each successive printing operation.
Lithographic printing, which includes offset printing, photolithography, photo-offset printing, lithography and planography, is the process in which the printing surface is without appreciable relief or depression, the image area being ink-receptive and the non-image area being water-receptive. As used herein, the term "lithographic printing" refers to all those printing methods in which the printing surface is without appreciable relief or depression. Lithographic printing is distinguished from letter press printing, wherein raised type or image surfaces are used to transfer ink to a printing surface.
In lithographic printing, the non-image areas are first moistened with water or other material to make them ink-repellant, the image areas are then inked by means of rollers and the ink is finally transferred by pressure to a receiving surface. Direct lithography involves a direct transfer of ink from a flat or cylindrical stone or plate to the material being printed. Offset lithography embodies an additional cylinder covered with a rubber blanket which is interposed between the plate cylinder and impression cylinder. Thus, in offset lithography, the ink is transferred first from the plate cylinder to the rubber blanket of the offset cylinder and from there to the paper or other material passing between the offset cylinder and the impression cylinder.
The following examples illustrate various features of the present invention, but are intended to in no way limit the scope of the invention, which is defined in the appended claims.
A vehicle is prepared which is to be used to prepare a lithographic printing ink to provide a onestep printing ink composition. The vehicle contains the following ingredients at the indicated level:
______________________________________ INGREDIENT LEVEL ______________________________________ Alkyd resin (Gardner - Holdt) 2 pounds Viscosity - No. Z4) Concentrated nitric acid 120 cc (Reagent grade-70% HNO.sub.3) Glycerin 300 cc Ethylene glycol 126 cc Amyl acetate 128 cc Turpentine 120 cc ______________________________________
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