# US 4,148,767 A · Ink for dry planographic printing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,148,767 A - Document ID: US4148767A - Status: Granted - Kind: A - Application number: 05/837,863 - Filed: 1977-09-29 - Granted: 1979-04-10 - Earliest claimed: 1976-09-29 - Assignees: Gestetner Limited - Inventors: Leonard A. Spicer; Derek J. McGee - Web page: https://patentgrep.com/patent/US4148767A ## CPC - C09D 11/102: containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds - B41M 1/08: Dry printing - C08G 18/4027: {Mixtures of compounds of group C08G18/54 with other macromolecular compounds} - C08G 18/4288: {modified by higher fatty oils or their acids or by resin acids} - C08G 18/542: {with phenols} - Y10S 260/38: Ink - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P) - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) An ink according to claim 1 in which the said vehicle comprises the reaction product of soya bean oil or linseed oil, an alkyd resin derived from isophthalic acid or phthalic acid and pentaerythritol or glycerol, a rosinmodified phenolic resin, and toluene diisocyanate. ### Claim 3 (depends on 1) An ink according to claim 1 in which the silicone oil is a dimethylpolysiloxane oil having a viscosity of 1000 to 10,000 centistokes at 20.degree. C. ### Claim 4 (depends on 1) An ink according to claim 1 which also contains 0.6 to 3% by weight of the ink of an animal or vegetable wax soluble in said vehicle and having a melting point of 45.degree. to 90.degree. C. ### Claim 5 (depends on 1) Process for the preparation of an ink as claimed in claim 1 which comprises mixing the silicone oil in an animal or vegetable wax having a melting point of 45.degree. to 95.degree. C. while the latter is in the molten state, the said wax being soluble in the said vehicle, allowing the wax to solidify, dispersing the solid mixture of wax and silicone oil in the vehicle while the latter is at elevated temperature, and milling the pigment into the vehicle thereby to produce the ink having the silicone oil finely and uniformly dispersed therein. ### Claim 6 (depends on 1) A method of dry planographic printing which comprises imaging a planographic printing plate having an oleophobic surface with an ink-accepting image, applying an ink as claimed in claim 1 to the imaged plate, and printing from the inked plate. ### Claim 7 (depends on 6) A method according to claim 6 in which the said plate carries an image of a fused toner applied thereto by an electrophotographic method. ### Claim 8 (depends on 7) A method according to claim 7 in which the said toner is a polystyrene-based or styrene copolymer resin-based toner.