| 摘要 |
PURPOSE: A method for stabilizing a blocked polyisocyanate against thermal yellowing, a composition containing a blocked polyisocyanate, a coating agent containing the composition, and a coated product obtained from the coating agent are provided, to obtain a coating agent having an excellent stability to thermal yellowing. CONSTITUTION: The composition comprises at least one blocked polyisocyanate; and at least one compound represented by the formula 1, 2 or 3, wherein R1 to R4 are independently H or an alkyl group of C1-C25, or two, three or four groups of R1 to R4 can form an aliphatic ring of C1-C25 in combination; and in the formula 1, R2 and R3 or R3 and R4 can form a substituted or unsubstituted benzene ring fused to a pyrazole ring in combination. Preferably the blocked polyisocyanate contains 95 mol% or more of blocked forms.
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