| abstract |
An N-substituted carbamoyl-lactam compound of the formulan wherein R is a radical derived from polytetramethyleneglycol R(OH) 2 and represents the radical remaining from the polytetramethylene oxide starting material used in preparing polytetramethyleneglycol and has an equivalent weight of 300-2500,n R' is an alkylene, cycloalkylene, arylene, alkarylene or an aralkylene group having 6-25 carbon atoms, Y is a C 3 -C 14 alkylene group, and a has a value of at least 1. n This compound is suitable as an activator for the lactam polymerization, especially in RIM applications. |