Printing ink vehicle containing a conjunct copolymer drying oil

Claim 1

A PRINTING INK COMPOSITION COMPRISING A PIGMENT AND A DRYING OIL VEHICLE, SAID DRYING OIL VEHICLE CONTAINING THE PRODUCT OF THE CONJUNCT COPOLYMERIZATION OF AN UNSATURATED NON-AROMATIC HYDROCARBON CONTAINING AT LEAST 3 CARBON ATOMS PER MOLECULE AND AN UNSATURATED FATTY ACID ESTER DRYING OIL, SAID PRODUCT HAVING BEEN PREPARED BY CONJUNCT COPOLYMERIZATION PRODUCT BEING FORMED IN THE PRESENCE OF AN ACID-ACTING CATALYST, SEPARATION OF THE REACTION MIXTURE INTO A HYDROCARBON PHASE AND A SLUDGE COMPLEX OF THE CATALYST WITH THE CONJUNCT COPOLYMER AND DECOMPOSITION OF SAID SLUDGE COMPLEX TO LIBERATE THE CONJUNCT COPOLYMERIZATION PRODUCT, AND SAID PRODUCT HAVING A BROMINE NUMBER ABOVE 90 AND A MALEIC ANHYDRIDE VALUE OF FROM ABOUT 20 TO 90 AND CONTAINING FROM ABOUT 2.5 TO ABOUT 8 DOUBLE BONDS PER MOLECULE, OF WHICH FROM ABOUT 20 TO ABOUT 70% ARE IN CONJUGATED RELATIONSHIP TO EACH OTHER.