Process for the production of a carbodiimide

A process for a production of a carbodiimide, comprising steps of:

• (1) reacting an amine represented by the following formula (A) with carbon disulfide in the presence of a catalyst at a reaction temperature of 50 to 150° C. to obtain a thiourea represented by the following formula (B):
• wherein in the above formula (A), R is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms;
• wherein in the above formula (B), R is as defined in the above formula (A);
• (2) desulfurizing the obtained thiourea with a hypochlorite in the presence of a basic compound to obtain a carbodiimide represented by the following formula (C):
• wherein in the above formula (C), R is as defined in the above formula (A);
• and
• (3) purifying the obtained carbodiimide;
• wherein the step (1) is carried out in a sealed condition.