| Patents for C09B 41 - Special methods of performing the coupling reaction (551) |
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| 06/17/1981 | EP0030337A2 Monoazo dyestuffs, process for their preparation, and their concentrated solutions |
| 05/20/1981 | EP0029009A1 Preparation of pigments |
| 05/19/1981 | US4268436 Oxidative diazotization with nitrosylsulfuric acid, alkaline metal nitrites, or alkyl nitrites |
| 05/13/1981 | EP0028464A1 Azo dyestuff preparation by phase transfer catalysed coupling in a two-phase medium |
| 05/06/1981 | EP0028203A1 Process for carrying off the reaction heat from exothermal chemical reactions and apparatus for carrying out the process |
| 02/24/1981 | US4252718 Continuous azo coupling process |
| 02/17/1981 | CA1095898A1 Preparation of azo dyestuffs |
| 02/10/1981 | US4250089 Process for diazotizing aromatic amines |
| 02/03/1981 | US4248777 Process for preparing Acid Red 151 |
| 01/27/1981 | US4247458 Coupling diazonium salt with disperse dye coupler with displaceable group other than hydrogen |
| 12/16/1980 | US4239886 Salts of N-acylaminohydroxynaphthalenesulphonic acids |
| 10/01/1980 | EP0016388A1 Process for the preparation of diazonium salt solutions |
| 10/01/1980 | EP0016334A1 Concentrated, alkalihydroxide-containing solutions of water-insoluble coupling components and their use in ice colour dyeing |
| 09/16/1980 | US4222788 Mixed pigment and process of preparing the same |
| 05/27/1980 | US4204871 Printing inks containing nucleated organic pigments |
| 05/13/1980 | CA1077470A1 Process for the preparation of improved c.i. acid red 42, and its dyestuff compositions |
| 04/30/1980 | EP0010219A1 Continuous preparation process for azo pigments |
| 03/18/1980 | CA1073611A1 Dyestuff preparations and processes for their production |
| 02/26/1980 | US4190578 Dialysis monitored preparation of metal salts of azo pigments |
| 01/08/1980 | US4182708 Process for the preparation of azo pigments by diazotizing in a dipolar aprotic organic solvent and azo pigments obtained therefrom |
| 10/02/1979 | CA1063598A1 Process for the preparation of water-soluble azo dyestuffs |
| 09/05/1979 | EP0003767A1 N-Acylaminohydroxynaphthalenesulfonic acid salts, process for their preparation and their use as coupling components in the preparation of azo dyes. |
| 08/28/1979 | CA1061334A1 Preparation of azo pigments |
| 07/31/1979 | US4163012 Process for the preparation of concentrated dyestuff solutions |
| 07/24/1979 | CA1059120A1 Process for preparing thiazolazo compounds |
| 06/26/1979 | US4159264 Automatic control of azo coupling processes in the manufacture of azo pigments |
| 02/27/1979 | US4141892 Process for preparing p-[[p-(phenylazo)phenyl]azo]phenol |
| 12/26/1978 | CA1045124A1 Continuous process for aminoazobenzene |
| 10/03/1978 | US4118384 Process for preparation of azo dyestuffs by coupling in presence of aromatic sulphonic acid-formaldehyde reaction product |
| 09/19/1978 | US4115380 Process for the preparation of dihydroxyphenylazophenylazophenyl dyestuffs |
| 09/05/1978 | US4111649 Dyestuff preparations and processes for their production |
| 07/18/1978 | US4101542 Process for the selective destruction, by reduction, of p-coupled products of the 1-naphthol series |
| 05/16/1978 | US4089700 Process for the preparation of opaque organic pigments |
| 04/11/1978 | US4083846 Free from sulphonic acid groups |
| 04/04/1978 | US4082742 Process for preparing an aqueous disazo dye concentrate |
| 03/14/1978 | US4078887 Concentrated stable solutions of coupling components for the ice color dyeing, their preparation and use |
| 02/14/1978 | US4073781 Method of production of azo dyes from a quinone containing compound and a diazonium compound |
| 11/15/1977 | US4058517 Preparation of a concentrated solution of an anionic azo dye containing a sulfonic acid group |
| 09/06/1977 | US4046752 Process for preparing an azo compound from a 2-aminothiazole diazo component |
| 07/12/1977 | US4035350 Process for the preparation of water-soluble azo dyestuffs by reacting an aromatic amine and a coupling component with alkali metal nitrite or alkyl nitrite in the absence of acid |
| 07/12/1977 | US4035196 Absorbent composition |
| 06/07/1977 | US4028323 With a substituted aminobenzene |
| 04/26/1977 | US4019966 Method of amperometric determination of the concentration of arendiazonium salts |
| 04/19/1977 | US4018751 Continuous process for aminoazobenzene |
| 04/12/1977 | US4017325 Pigment composition |
| 04/12/1977 | US4017256 Fiber dyeable with disperse dyes and fiber dyeable with reactive dyes |
| 12/21/1976 | US3998804 Process for coupling of water-insoluble 2,4-disubstituted phenols with diazotized o-nitroanilines |
| 06/01/1976 | US3960591 Process for the preparation of pigment compositions for the dope dyeing of polyacrylonitrile |
| 04/20/1976 | US3951943 Coupling process in the preparation of disazo diimides |
| 03/16/1976 | US3944540 Precipitation of organic dyes and dye intermediates in the presence of finely divided polytetrafluoroethylene |
| 03/02/1976 | US3941768 One step diazotization coupling process |