| 摘要 |
Branched polyfunctional carbodiimides of formula I <CHEM> wherein: M and Q are independently the residue of a compound adapted to function as a site for branching; R<1>, R<2>, R<4>, R<5>, R<6>, and R<7> are independently divalent organic radicals; R<3> and R<8> are independently monovalent organic radicals; a is 3 to 6; b, e, f and g are 0 to 4; and e, d, and h are 0 or 1; are disclosed which are monodisperse, i.e., have exact functionality and molecular weight distribution. Compsoitons based on these polyfunctional carbodiimides have low viscosity relative to their molecular weight and are particularly useful as cross-linkers for carboxyl-containing resins. |
