公开(公告)号：DE19928741A1

公开(公告)日：2000-12-28

申请号：DE19928741

申请日：1999-06-23

Applicant: BASF AG

Inventor： REIF MARTIN ,  ABEEL PETER VAN DEN ,  NEVEJANS FILIP ,  SCHWARZ HANS VOLKMAR ,  PENZEL ULRICH ,  SCHARR VOLKER

IPC: C07C263/10 ,  C07C265/14 ,  C08G18/76 ,  C07C265/00 ,  C08G18/00 ,  C08G71/00

Abstract: Isocyanates (I) are prepared by reaction of an amine or a mixture of at least two amines with phosgene that contains less than 50 ppm bromine and/or iodine in molecular or bound form.

公开(公告)号：CA2329655A1

公开(公告)日：1999-10-28

申请号：CA2329655

申请日：1999-04-12

Applicant: BASF AG

Inventor： PFEFFINGER JOACHIM ,  NAUMANN FRITZ ,  SCHARR VOLKER ,  POPLOW FRANK ,  PENZEL ULRICH ,  DOSCH JURGEN ,  SCHWARZ HANS VOLKMAR ,  JACOBS JAN ,  VAN DEN ABEEL PETER ,  STAROSTA DIETER ,  NEVEJANS FILIP ,  VAN PEE WILLY ,  BOESEL HILMAR ,  STROFER ECKHARD

IPC: C07C263/10 ,  C07C263/20 ,  C07C265/14

Abstract: The invention relates to a method for producing mixtures consisting of diphenylmethane diisocyanates and polyphenylene-polymethylene-polyisocyanates containing a reduced amount of chlorinated secondary products and with a reduced iodine colour index. According to said method, a two-stage reaction of the corresponding mixtures of diphenylmethane-diamines and polyphenylenepolymethylene polyamines with phosgene is carried out in the presence of at least one inert organic solvent at a high temperature. When the phosgenation is complete, the excess phosgene and solvent are separated off and the product of the reaction is treated with heat. The method is characterised in that the mass ratios of phosgene to hydrogen chloride in the detention apparatus in the second stage of phosgenation are simultaneously 10-30:1 in the liquid phase and 1-10:1 in the gas phase.

公开(公告)号：CA2209139A1

公开(公告)日：1997-12-26

申请号：CA2209139

申请日：1997-06-25

Applicant: BRUCHMANN BERND ,  BASF AG

Inventor： NEVEJANS FILIP ,  BRUCHMANN BERND ,  KRAUS RUPERT ,  SEYFERT WILFRIED ,  VAN DEN ABEEL PETER ,  TESCH HELMUT

IPC: C07C263/10 ,  C07C263/18 ,  C07C263/20 ,  C07C265/00 ,  C08G18/70 ,  C08G101/00 ,  C07C263/16 ,  C07C265/14 ,  C08G18/76

Abstract: In a process for preparing solutions containing at least one isocyanate, the above-defined solution is subjected to a treatment with hydrogen after the phosgenation and before the complete removal of the solvent and of residual phosgene. A process for preparing isocyanates or isocyanate mixtures is provided, and the isocyanates thus prepared can be used for preparing polyurethanes, in particular polyurethane foams.