Tert-alkyl-phenylenediamines.

摘要

This invention relates to a class of tert-alkyl-para-phenylenediamines having alkyl groups ortho to an amine group. More particularly, the aromatic diamines are represented by the formulas: <CHEM> wherein R1, R2 and R3 are C1-3 alkyl groups or R2 and R3 are combined to form a C5-6 membered ring. The above described alkylated para-phenylenediamines have been found to be well suited for use as a chain extender in forming polyurethane/urea elastomer systems and provide enhanced benefits in terms of delayed reactivity for facilitating the processing of the elastomer systems, and high tensile strength, thermal stability and tear resistance in the resulting elastomer itself.