| 摘要 |
<p>The invention relates to new Mannich bases of the formula
<CHEM>
wherein each of R<1> and R<2>, independently, represents a hydroxyalkyl radical, and to oxyalkylation derivatives of the formula
<CHEM>
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.
<??>The compounds according to the invention are useful for the manufacture of rigid polyurethane foams. </p> |
