| abstract |
Branched polyfunctional carbodiimides of formula In wherein: M and Q are independently the residue of a compound adapted to function as a site for branching; nR¹, R², R⁴, R⁵, R⁶, and R⁷ are independently divalent organic radicals; nR³ and R⁸ are independently monovalent organic radicals; na is 3 to 6; b, e, f and g are 0 to 4; and e, d, and h are 0 or 1; nare 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. |