| 摘要 |
<p>A thermosetting coating composition for a precoated steel sheet, a precoated sheet made by using the coating composition, and a process for preparing the same. The coating composition comprises a polyol mixture containing particular compounds as a main agent and a polyisocyanate compound as a curing agent and is characterized in that the curing agent comprises a mixture of a blocked polyisocyanate compound, prepared by blocking a particular polyisocyanate or its derivative selected from the group (a) of compounds, with another blocked polyisocyanate compound, prepared by blocking a particular polyisocyanate or its derivative selected from the group (b) of compounds. This composition can yield a coating film which is excellent in all of the processability, coating hardness, and stain resistance.</p> |
