公开(公告)号：US3903127A

公开(公告)日：1975-09-02

申请号：US44177874

申请日：1974-02-12

Applicant: BAYER AG

Inventor： WAGNER KUNO ,  EIMER JOHANNES ,  ZIRNER JOACHIM ,  RAAB RAINER ,  LIEBSCH DIETRICH

IPC: C08G18/00 ,  C07C67/00 ,  C07C239/00 ,  C07C273/18 ,  C07C275/62 ,  C08G18/78 ,  C07C118/00 ,  C07C119/042

CPC classification number: C07C273/1863 ,  C07C273/1872 ,  C08G18/7831 ,  C07C275/62

Abstract: Comparatively low viscosity biuret containing polyisocyanates are produced by reacting diisocyanates and biuretizing agents in proportions corresponding to a molar ratio of diisocyanate to monofunctional biuretizing agent of at least 11 : 1.

公开(公告)号：US3555081A

公开(公告)日：1971-01-12

申请号：US3555081D

申请日：1968-11-14

Applicant: BAYER AG

Inventor： ZIRNER JOACHIM ,  KLEB KARL-GUSTAV

IPC: C07C143/20

Abstract: PROCESS FOR THE PREPARATION OF N-MONOCYCLOHEXYL AMIDOSULFONIC ACID, I.E. N-CYCLOHEXYL SULFAMIC ACID OF THE FORMULA

R-NH-SO2H

IN WHICH R IS CYCLOHEXYL, BY CONTACTING A CYCLOHEXYL UREA OF THE FORMULA

R-NH-CO-NH-R''

IN WHICH R IS CYCLOHEXYL AND R'' IS HYDROGEN OR CYCLOHEXYL, SUBSTANTIALLY IN THE ABSENCE OF WATER AND IN THE PRESENCE OF AN INERT ORGANIC DILUENT OR SOLVENT AT ABOUT-20 TO 140*C., WITH (A) AT LEAST TWICE, PREFERABLY 2-4 TIMES, THE MOLAR QUANTITY OF SO2; OR (B) IN A FIRST STAGE WITH AT LEAST THE EQUIMOLAR QUANTITY, PREFERABLY 2 TIMES THE MOLAR QUANTITY, OF SO2 OR A COMPOUND THAT GIVES OFF SO2 UNDER THE REACTION CONDITIONS, AND IN A SECOND STAGE WITH AT LEAST THE EQUIMOLAR QUANTITY, PREFERABLY 2 TIMES THE MOLAR QUANTITY OF SO3; OR (C) IN A FIRST STAGE WITH A LEAST THE EQUIMOLAR QUANTITY, PREFERABLY 2 TIMES THE MOLAR QUANTITY, OF SO2 OR A COMPOUND THAT GIVES OFF SO2 UNDER THE REACTION CONDITION AND IN A SECOND STAGE WITH A QUANTITY OF OLEUM CONTAINING AT LEAST THE THE EQUIMOLAR QUANTITY, PREFERABLY 2 TIMES THE MOLAR QUANTITY, OF SO2; AND RECOVERING THE RESULTING PRECIPITATE, E.G. BY SUCTION FILTRATION, FROM THE REACTION MIXTURE.