| 摘要 |
<p>PURPOSE:To obtain a binder for printing ink which is improved in the resistance to heat generated by heat sealing, gloss, adhesion to a non-absorbing base and adaptability to laminating by reacting a specific polyamide prepolymer, urethane prepolymer, and optionally a terminal blocker. CONSTITUTION:An acid component containing a polymeric fatty acid and an amine component containing a polyamine are reacted in an inert gas at 140 to 250 deg.C to obtain a polyamide prepolymer having an amino equivalent of 310 to 5610 and containing primary and/or secondary amino groups. The amine component is employed in an amount in excess of the amount of the acid component in terms of equivalent. A high-molecular diol with an average molecular weight of 500 to 5,000 and an organic diisocyanate are reacted to obtain a urethane prepolymer with an isocyanate equivalent of 470 to 11,200. The organic diisocyanate is employed in an amount in excess of the amount of the acid component in terms of equivalent. The polyamide prepolymer, the urethane prepolymer and a terminal blocker are reacted in a solvent to obtain a binder which is made of a polyamide urea urethane resin with a concentration of 10 to 60wt.% and a viscosity of 50 to 50,000cP/20 deg.C. The equivalent ratio of the polyamide prepolymer to the urethane prepolymer is 1.0:(0.8-1.2), and that of the polyamide prepolymer to the terminal blocker is 1.0:(0-0.3).</p> |
