| 摘要 |
AN AQUEOUS POLYURETHANE RESIN COMPOSITION CAPABLE OF FORMING A FILM EXCELLENT IN CORROSION RESISTANCE, ALKALI RESISTANCE, PAINT ADHESION AND LUBRICITY ON A ZINCIFEROUS METAL?PLATED STEEL STRIP COMPRISES (A) A POLYURETHANE RESIN COMPRISING A POLYESTER SKELETON MOIETY AND A POLYETHER SKELETON MOIETY AND HAVING A TENSILE STRENGTH AT BREAK OF 3.92 kN/cm� OR MORE, AND A TENSILE ELONGATION AT BREAK OF 50% OR LESS, DETERMINED IN ACCORDANCE WITH JIS K 7113 AND A GLASS TRANSITION TEMPERATURE (Tg) OF 80 TO 150�C, DETERMINED IN ACCORDANCE WITH JIS K 7121, (B) POLYOLEFIN RESIN FINE PARTICLES HAVING A MELTING POINT OF 70 TO 160�C AND A PARTICLE SIZE OF 0.5 TO 5 ?m, AND (C) A COLLOIDAL SILICA HAVING A PARTICLE SIZE OF 5 TO 50 NM, WHEREIN, BASED ON THE TOTAL SOLID MASS OF THESE COMPONENTS A, B AND C, THE SOLID CONTENT RATIO OF THE COMPONENT (A) IS FROM 50 TO 93 MASS%, THE SOLID CONTENT OF THE COMPONENT (B) IS FROM 2 TO 20 MASS%, AND THE SOLID CONTENT OF THE COMPONENT (C) IS FROM 5 TO 40 MASS%. |
