A process for preparing a tolylene diisocyanate (TDI) composition containing about 5-19 percent by weight nominal TDI trimer and having improved stability by heating a TDI composition containing about 25-40 percent nominal TDI trimer and an amount of TDI dimer such that the dimer/trimer ratio is greater than about 0.14 at a temperature of at least about 130 DEG C. until the dimer/trimer ratio is less than about 0.14 and diluting the resulting composition with a monomeric TDI composition to achieve a nominal trimer concentration of about 5-19 percent.
申请公布号
DE2063731(B2)
申请公布日期
1979.12.20
申请号
DE19702063731
申请日期
1970.12.24
申请人
E.I. DU PONT DE NEMOURS AND CO., WILMINGTON, DEL. (V.ST.A.)
