| 摘要 |
PROBLEM TO BE SOLVED: To provide an additive composition for coating having excellent transparency of a coating film, capable of improving self-repair effect to a flaw on the coating film.SOLUTION: An additive composition for coating contains a reactant of allophanate group-containing polyisocyanate (A) in which a weight-average molecular weight is 1,000-3,000, and the content rate of an isocyanate group is 10-25 mass%, and an alcohol compound (B) in which a weight-average molecular weight is 100-5,000, a hydroxyl value is 20-600 mgKOH/g, and a hydroxyl number is 1-5.SELECTED DRAWING: None |
