公开(公告)号：JPH11217417A

公开(公告)日：1999-08-10

申请号：JP30638898

申请日：1998-10-14

申请人： BAYER AG

发明人： RASSHOFER WERNER ,  GROENEN JUEGEN DR ,  SCHMIDT MANFRED ,  WOYNAR HELMUT DR

IPC分类号： C08J9/00 ,  C08G18/22 ,  C08G18/40 ,  C08G18/48 ,  C08G18/65 ,  C08G18/66 ,  C08G18/76 ,  C08G18/78 ,  C08G18/79 ,  C08G71/04 ,  C08G101/00 ,  C08L75/04

摘要： PROBLEM TO BE SOLVED: To obtain the material having a low density, short mold release time and high hardness by reacting a specific polyisocyanate component, a polyether polyol component, water, a polyol component, optionally an additive, and a foaming agent. SOLUTION: A semirigid polyurethane foamed material is obtained by blending: (A) a polyisocyanate component having an NCO group content of 30-47 wt.%, a biuret structure, and contg. a toluene diisocyanate with an NCO group content of 33-47 wt.%; (B) a polyether polyol component having an average mol.wt. of 1,000-12,000 and at least two functionality values, and if necessary a solid content of 50 pts.wt. or less based on the whole component B wt.; if necessary (C) a polyol component having an average mol.wt. of 62-1,000 and at least two functionality values; optionally (D) an additive; (E) a foaming agent; and (F) water of 0.5-8 wt.% relative to the total wt. of components B through E, until the isocyanate index coming to 30-180, and then by reacting them.

公开(公告)号：JPH10237037A

公开(公告)日：1998-09-08

申请号：JP5736298

申请日：1998-02-24

申请人： BAYER AG

发明人： WOYNAR HELMUT DR ,  SCHMIDT MANFRED ,  GROENEN JUEGEN DR

IPC分类号： B01F3/04 ,  C07C273/18 ,  C07C275/62 ,  C08G18/02 ,  C08G18/78 ,  G01N33/58

摘要： PROBLEM TO BE SOLVED: To provide an one step method for producing a polyisocyanate having a biuret structure on the basis of an isocyanate having an isocyanate group bound to an aromatic group without forming an undesired solid product by- produced on the reaction of an isocyanate with an organic diamine. SOLUTION: This method for producing a polyisocyanate having a biuret structure comprises continuously mixing an organic diisocyanate having an isocyanate group bound to an aromatic group with an organic diamine having an amino group bound to an aromatic group in a mixing chamber in a molar ratio of at least 8:1, reacting the mixture at a temperature of >180 deg.C and controlling the retention time of the reaction mixture in the mixing chamber from the mixing time of the organic diisocyanate with the organic diamine maximally to 60sec.