| 摘要 |
<p>THE PRESENT INVENTION PROVIDES A STEEL SHEET WHICH HAS AN ALKALI-SOLUBLE LUBRICATING FILM ON THE SURFACE, AND WHICH IS CHARACTERIZED IN THAT: THE LUBRICATING FILM HAS A FIRST LAYER THAT CONTAINS (PS) A POLYETHYLENE OXIDE HAVING A WEIGHT AVERAGE MOLECULAR WEIGHT OF 50,000-500,000 AND (B) A COPOLYMER OF (X) A STYRENE-BASED HYDROCARBON COMPOUND OR AN OLEFIN-BASED HYDROCARBON COMPOUND HAVING 3 OR MORE CARBON ATOMS AND (Y) EITHER OR BOTH OF A POLYMERIZABLE UNSATURATED COMPOUND HAVING A CARBOXYLIC ANHYDRIDE GROUP AND A POLYMERIZABLE UNSATURATED COMPOUND HAVING A CARBOXY GROUP, SAID COMPOUNDS BEING COPOLYMERIZABLE WITH THE COMPOUND (X), WHEREIN SOME OR ALL OF THE CARBOXYLIC ANHYDRIDE GROUPS AND THE CARBOXY GROUPS CONTAINED IN THE COPOLYMER MAY BE AMMONIA-MODIFIED, IMIDIZED OR BLOCKED BY AN ALCOHOL, WITH THE WEIGHT RATIO OF THE COMPONENT (B) RELATIVE TO THE TOTAL OF THE COMPONENT (A) AND THE COMPONENT (B) BEING MORE THAN 5% BY WEIGHT BUT LESS THAN 50% BY WEIGHT, AND A SECOND LAYER THAT IS PROVIDED ON THE FIRST LAYER AND IS FORMED OF AN OIL LAYER THAT CONTAINS AN OIL COMPONENT HAVING A KINETIC VISCOSITY OF 3 TO 32 MM2/S (AT 40°C); THE TOTAL ADHESION AMOUNT OF THE COMPONENT (A) AND THE COMPONENT (B) IS 0.1 TO 1.0 G/M2 AND THE ADHESION AMOUNT OF THE OIL LAYER IS 0.1 TO 3.0 G/M2.</p> |
