Patent ID: 6184410
Filing Date: 2001-02-06
Classification: C07C,C08G

Abstract:
A process for preparing carbodiimides based on 1,3-bis(1-methyl-1-isocyanatoethyl)benzene containing from 12 to 40% by weight of ethylene oxide units, based on the weight of the carbodiimides, which comprising reacting 1,3-bis(1-methyl-1-isocyanatoethyl)benzene in the presence of catalysts with elimination of carbon dioxide to form carbodiimides containing isocyanate groups and subsequently reacting said carbodiimides containing isocyanate groups with a mixture comprising:(i) compounds which are reactive towards isocyanates and contain at least 5 ethylene oxide units and(ii) compounds which are reactive toward isocyanates and contain less than 5 ethylene oxide units.