| abstract |
The invention relates to new Mannich bases of the formulan wherein each of R¹ and R², independently, represents a hydroxyalkyl radical, and to oxyalkylation derivatives of the formulan wherein each of a, b and c represents zero or a positive integer, their sum being in the range from 3 to 8, and wherein each A radical represents independently a propylene or ethylene radical. n The compounds according to the invention are useful for the manufacture of rigid polyurethane foams. |