Printing on olefin polymers and ink compositions therefor

Claim 1

IN PRINTING ON UNTREATED POLYETHYLENE TO PROVIDE PRINTING THEREON WHICH IS STRONGLY ADHERENT THERETO UNDER NORMAL CONDITIONS OF USE, THE STEP WHICH COMPRISES EFFECTING SAID PRINTING WITH AN INK COMPOSITION CONSISTING ESSENTIALLY OF (A) A MEMBER SELECTED FROM THE GROUP CONSISTING OF POLYBUTENES AND POLYISOBUTENES HAVING AN AVERAGE MOLECULAR WEIGHT IN THE RANGE OF 1200 TO 9000, (B) A NORMALLY SOLID RESIN HAVING A SOFTENING POINT IN THE RANGE OF 100 TO 150 DEGREES C., (C) A FINELY DIVIDED INERT SOLID WHICH PASSES THROUGH A 325 MESH SCREEN, SAID FINELY DIVIDED INERT SOLID BEING SELECTED FROM THE GROUP CONSISTING OF CALCIUM CARBONATE, MAGNESIUM CARBONATE, CALCIUM SULFATE, MAGNESIUM SULFATE, TITANIUM DIOXIDE, DIATOMACEOUS EARTH, AND CLAYS, THE SAID FINELY DIVIDED INERT SOLID BEING PRESENT IN PROPORTIONS, BY WEIGHT, IN EXCESS OF EACH OF THE (A) AND (B) INGREDIENTS, (D) COLORING MATTER, AND (E) AN INK-TYPE ORGANIC SOLVENT.