A method for the preparation of rigid foams by reacting an organic polyisocyanate with an isocyanate-reactive material in the presence of a blowing promoter characterized in that the isocyanate-reactive material comprises at least one isocyanate-reactive cyclic carbonate or isocyanate-reactive cyclic urea, the reaction being performed in the presence of an inert insoluble organic liquid which is present as the disperse phase of an emulsion or a microemulsion, and in the presence of a metal salt catalyst.
申请公布号
US5703136(A)
申请公布日期
1997.12.30
申请号
US19930034921
申请日期
1993.03.19
申请人
IMPERIAL CHEMICAL INDUSTRIES PLC
发明人
GILLIS, HERBERT RUSSELL;STANSSENS, DIRK;DE VOS, RIK;POSTEMA, AALDRIK ROELF;RANDALL, DAVID