re R is a fatty group derived from tallow and R is a fatty group derived from soya, polymerised tolylene \di-isocyanate/ R NH where R is a fatty group derived from soya, polymerised tolylene diisocyanate/R'NH Where R is oleyl, and the adducts from oleylamine or di-soya-amine with the isocyanate ended polyurethanes from tolylene di-isocyanate and polyols.