公开(公告)号：US3906019A

公开(公告)日：1975-09-16

申请号：US46399174

申请日：1974-04-25

Applicant: GEN MOTORS CORP

Inventor： CAMPBELL GREGORY A ,  DEARLOVE THOMAS J ,  MELUCH WILLIAM C

IPC: C07C273/18 ,  C07C275/40 ,  C08G18/78 ,  C08G18/80 ,  C07C118/00 ,  C07C119/048

CPC classification number: C07C273/1827 ,  C08G18/7825 ,  C08G18/8045 ,  C07C275/40

Abstract: Water and toluene diisocyanate (TDI) are rapidly and thoroughly mixed to produce a di(isocyanato-tolyl) urea monomer which is used in the preparation of polyurethane resins. A sufficient excess of either reactant, with respect to stoichiometry, is required to provide a suspension medium having a relatively low viscosity; this allows the continued vigorous stirring of the reactants and the product. The expected polymerization reaction which would form undesirable higher molecular weight ureas is prevented by the extreme immiscibility of the monomeric urea in either water or toluene diisocyanate (TDI). The desired monomer precipitates and is the final product of this reaction.

Abstract translation: 水和甲苯二异氰酸酯（TDI）快速且充分地混合以制备用于制备聚氨酯树脂的二（异氰酸酯基 - 甲苯基）脲单体。 需要相对于化学计量的足够过量的任一种反应物以提供具有相对较低粘度的悬浮介质; 这允许反应物和产物继续剧烈搅拌。 通过单体尿素在水或甲苯二异氰酸酯（TDI）中的极不混溶来防止形成不期望的较高分子量脲的预期聚合反应。 所需的单体沉淀，并且是该反应的最终产物。