Printing ink compositions

Claim 1

A printing ink composition comprising an ink vehicle of which from about 1 to 70% by weight is a silicone-modified phenolic resin prepared by reacting an oil-soluble solid phenolic resin with an amino group-containing organopolysiloxane having in a molecule, at least one organosiloxane unit represented by the general formula where Z is a group selected from the class consisting of --NH 2 , --HC 2 H 4 NH 2 and --OR 3 NH 2 , R 3 being a divalent hydrocarbon group having 2 to 5 carbon atoms, R 1 is a divalent hydrocarbon group having 1 to 6 carbon atoms, R 2 is a monovalent hydrocarbon group having 1 to 3 carbon atoms, X is a hydroxy group or an alkoxy group having 1 to 6 carbon atoms, a is 0, 1 or 2 and b is 0, 1 or 2 with the proviso that a+b is 0, 1 or 2, and at least one component selected from the group consisting of high-boiling petroleum solvents, synthetic drying oils, resins, copals, dammars, shellacs, bardened rosins, rosin esters, phenolic resins, phenolic resins modified with rosins, maleic acid resins, alkyd resins, petroleum resins, vinylic resins, polyamid resins, epoxy resins, aminoalkyd resins, polyurethane resins, aminoplast resins, nitrocellulose, ethylcellulose, chlorinated rubbers, cyclic rubbers, casein, dextrin and zein is present in said ink vehicle in addition to said silicone-modified phenolic resin.