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PatentsPATENT NUMBER 4,197,346
Abstract A desensitizing ink for wet offset printing on the acceptor surface of a chemical duplicating set of superimposed sheets where one of the sets has an electrophilic acceptor coating and the other a nucleophilic coating for producing a chromogenic reaction wherein the nucleophilic desensitizing ink contains an alkoxylated nucleophilic compound which permits a continuous ink transfer to the water repellant zones of the wetted impression plate of an offset press and simultaneously neutralizes the corresponding zones of the acceptor surface.
Chemicals Referenced "benzoyl leuco derivative of methylene blue; lactone crystal violet; 65% by weight of ethoxylated octylphenol, 30% by weight of rosin esterified; 67% by weight ethoxylated nonylphenol and 33% by weight of resin esterified with glycerol; 15 parts by weight of titanium white (rutile); 66% by weight of a block copolymer of propylene oxide and ethylene oxide and 36% by weight of phenolic resin modified with maleic anhydride (acid number: 135-145); 69% by weight, polypropylene glycol and 31% by weight of phenolic resin, modified with maleic anhydride (acid number: 135-145); polyoxyethylenated acids and their salts (stearates, mixture of resin and fatty acids), polyoxyethylene alcohols (lauric, cetyl, stearic, oleic, tridecylic alcohols and their mixtures), the polyoxyethylenated sorbitol esters (oleate, tallow, beeswax, mixture of resinic acid and fatty acid." "In order to determine the degree of alkoxylation of the nucleophilic compounds which is most favorable in order to permit the continuous transfer of the ink in which they are incorporated from the inking rollers onto the water-repellent zones of the wetted impression plate of an offset press, recourse may be had to the HLB scale of industrial emulsifiers (Hydrophile-Lipophile Balance) developed by Atlas Chemical Industries Inc. (see also Morgan P. W. "Determination of Ethers and Esters of Ethylene Glycol", Ind. and Eng. Chem. Anal. E. Vol. 18, page 500, 1946)."
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