| 摘要 |
<p>1. Aromatic isocyanates consisting of mixtures of isomers and corresponding to substituted diphenylmethane asymmetric hydrocarbon structures, optionally in combination with substituted diphenylethane asymmetric structures, according to the general formulae : see diagramm : EP0107577,P12,F1 and see diagramm : EP0107577,P12,F2 alone or mixed, optionally in combination with see diagramm : EP0107577,P12,F3 with n from 1 to 2 ; R = H or CH3 and R1 = H, CH3 or NCO ; in the rings of type A, a single R corresponding to CH3 and in the rings of type B, a single R1 corresponding to NCO and two groups RI corresponding to CH3 , with the proviso that an -NCO group which cannot be surrounded by methyl groups in both ortho positions is bound to this ring. R' = CH3 or C2 H5 ; R" = H or CH3 , with R2 = H if R' = C2 H5 and R" = CH3 if R' = CH3 .</p> |
