| abstract |
Disclosed is a crosslinking or curing agent for resins which contains, as an active constituent, a polyacrylic hydrazide with an average molecular weight of 10,000-150,000 wherein the degree of conversion to hydrazide is not less than 30% and the number of hydrazide groups in a molecule is not less than 85. Also disclosed are a polyacrylic hydrazide with an average molecular weight of 20,000-30,000 and a polyacrylic hydrazide with an average molecular weight of 50,000-150,000. |