Polyester urethane material suitable as a vehicle for printing inks for regenerated cellulose substrates

Claim 1

A COMPOSITION OF MATTER SUITABLE FOR USE AS A VEHICLE FOR PRINTING INKS FOR APPLICATION TO REGENERATED CELLULOSE SUBSTRATES, COMPRISING A SOLVENT SOLUTION OF (1) A SATURATED LINEAR POLYESTER HAVING A RATIO OF HYDROXYL GROUPS TO METHYLENE GROUPS OF NOT MORE THAN ABOUT 0.20; SAID POLYESTER COMPRISING THE REACTION PRODUCT OF (I) A POLYHYDRIC ALCOHOL SELECTED FROM THE GROUP CONSISTING OF ETHYLENE GLYCOL, GLYCOL AND PENTAERYTHRITOL, WITH (II) A SATURATED DIBASIC ACID SELECTED FROM THE GROUP CONSISTING OF ADIPIC ACID, AZELAIC ACID, SEBACIC ACID, PHTHALIC ACID, AND ANHYDRIDES OF THE FOREGOING ACIDS; AND (2) A URETHANE HAVING AT LEAST ONE AVAILABLE ISOCYANATE GROUP PER MOLECULE, SAID URETHANE COMPRISING THE REACTION PRODUCT OF (I) A SATURATED DIISOCYANATE SELECTED FROM THE GROUP CONSISTING OF TOLYLENE DIISOCYANATE AND DIPHENYL 4,4''-DISOCYANATE, WITH (II) TRIMETHYLOL PROPANE; THE AMOUNT OF POLYESTER IN SAID COMPOSITION COMPRISING, ON A WEIGHT BASIS, AT LEAST TWICE THE AMOUNT OF URETHANE THEREIN; SAID COMPOSITION FURTHER CHARACTERIZED IN THAT WHEN APPLIED AS A THIN LAYER TO A REGENERATED CELLULOSE SUBSTRATE SOME OF SAID AVAILABLE ISOCYANATE GROUPS WILL FORM CHEMICAL LINKAGES WITH THE SUBSTRATE UPON THE EVAPORATION OF THE SOLVENT.