Alkylated vicinal toluenediamines and their use as chain extenders in the preparation of polyurethane- polyurea elastomers

Abstract From the Canadian patent

This invention relates to the preparation of polyurethane elastomers using alkylated vicinal toluenediamines as chain extenders. This process comprises reacting: (a) an organic polyisocyanate, (b) one or more compounds with an average molecular weight of 1000 to 8000 having two or more active hydrogen atoms as determined by the Zerewitinoff method, and (c) from 5 to 40 parts of a mixture of alkylated vicinal toluenediamines of the following structural formulae: (a) , ( b) , (d) , (c) , and, where R and R' independently represent a linear or nonlinear alkyl radical having 1 to 4 carbon atoms said parts, being based upon 100 parts of (b) plus (c).