| 摘要 |
<p>Improved fiber reinforced structural products are made in a mold cavity containing reinforcing fibers by reaction injection of impingement mixed isocyanante reactive ingredients comprising a soft-block component, a chain extender selected from primary aromatic polyamines having at least one electron withdrawing group attached directly to the ring, secondary diamines, an isocyanurate formation catalyst and a polyisocyanate.</p> |
