| Patents for C09B 48 - Quinacridones (562) |
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| 07/01/1998 | EP0851007A1 Organic pigment compositions |
| 05/26/1998 | US5755873 Incorporation of quinacridone additives during quinacridone preparation |
| 05/26/1998 | US5755872 Process for preparing quinacridone pigments |
| 05/20/1998 | EP0842987A2 Incorporation of quinacridone additives during quinacridone preparation |
| 05/12/1998 | US5750758 Pyrocarbonic acid diesters and the preparation and use thereof |
| 03/25/1998 | CN1176978A Oxidation process for preparing quinacridone pigments |
| 03/18/1998 | EP0829523A2 Oxidation process for preparing quinacridone pigments |
| 03/10/1998 | US5725651 Mono-N-alkyl-quinacridone pigments |
| 03/03/1998 | US5723626 Fluorescent isoindoline pigments |
| 02/03/1998 | US5713999 Incorporation of pigment derivatives in quinacridone processes |
| 01/28/1998 | CN1171416A Process for preparing quinacridone pigments |
| 12/16/1997 | US5698024 Heteroamidomethyl and/or heterothioamidomethyl derivatives; improved rheological properties and dispersibility |
| 11/12/1997 | EP0806456A2 Oxidation process for preparing quinacridone pigments |
| 11/05/1997 | EP0805189A2 Incorporation of pigment derivatives during quinacridone preparation processes |
| 11/05/1997 | EP0805188A2 Incorporation of aromatic polycyclic compounds during quinacridone preparation processes |
| 11/04/1997 | US5683502 Incorporation of aromatic polycyclic compounds in quinacridone processes |
| 10/08/1997 | EP0799862A2 Process for the manufacture of quinacridone pigments |
| 09/02/1997 | US5662739 Dioxazine pigments and quinacridone dyes and color strength |
| 08/20/1997 | EP0790281A2 Pigment compositions |
| 08/19/1997 | US5659076 Transesterification of dimethyl succinylsuccinate with alcohol by heating under pressure with acidic catalyst, reacting product with amine, acidifying, heating, blowing in air, reacting with metal hydroxide, then with water |
| 08/19/1997 | US5659036 Process for the production of 2,5-di(arylamino)-3,6-dihydroterephthalic acid dialkyl ester, and process for the production of quinacridone from said ester as intermediate |
| 08/13/1997 | CA2197275A1 Pigment compositions |
| 07/16/1997 | CN1154387A Process for preparing quinacridones |
| 07/02/1997 | EP0781310A1 Mono-n-alkyl-quinacridone pigments |
| 04/30/1997 | CN1148585A Soluble chromophore containing solubilizing group easy to be removed |
| 03/26/1997 | EP0764693A2 Process for preparing quinacridones |
| 03/26/1997 | EP0764628A1 Diesters of pyrocarbonic acid, their preparation and their use |
| 03/25/1997 | US5614014 Process for the preparation of Quinacridone pigments |
| 03/23/1997 | CA2186087A1 Process for preparing quinacridones |
| 03/12/1997 | EP0761772A1 Soluble chromophors containing solubility-enhancing groups which separate easily therefrom |
| 03/11/1997 | US5610306 Alcohol elimination reaction of 2,5-di(phenylamino)-3,6--dihydroterephthalic acid dialkyl ester; cyclization |
| 02/12/1997 | EP0667888B1 Pigment manufacturing process |
| 01/29/1997 | CA2182147A1 Soluble chromophores containing solubilising groups which can be easily removed |
| 01/02/1997 | EP0751105A2 Process for the oxidation of organic compounds |
| 10/01/1996 | US5561232 Carbamate group-containing soluble chromophores; solid state fluorescence in the ultraviolet range |
| 09/03/1996 | US5552547 Organometallic complexes with built-in fluorescent dyes for use in light emitting devices |
| 08/14/1996 | EP0726304A2 Organometallic complexes with built-in fluorescent dyes for use in light emitting devices |
| 06/25/1996 | US5529623 Replacements for perylene pigments in automotive finishes |
| 06/12/1996 | EP0716129A1 Process for the preparation of organic pigments |
| 05/21/1996 | US5518539 Process for the preparation of synergistic pigment mixtures |
| 04/03/1996 | EP0704496A1 Pigmentary solid solutions of pyrrolo 3,4-C pyrroles and quinacridones |
| 03/29/1996 | CA2159170A1 Pigmentary solid solutions of pyrrollo [3,4-c] pyrroles and quinacridones |
| 03/26/1996 | US5502192 Process for the preparation of quinacridones from dihydroquinacridones in an aqueous medium |
| 03/21/1996 | WO1996008537A1 Process for producing n-methylated organic pigments |
| 03/21/1996 | WO1996008536A1 Mono-n-alkyl-quinacridone pigments |
| 03/05/1996 | US5496405 Heating dianilinoterephthalic acid or derivative, dehydrating in presence of a salt, drowning in a liquid in which pigment is insoluble; metallic paints, enamels |
| 02/21/1996 | EP0697413A2 Process for the preparation of quinacridones from dihydroquinacridones in an aqueous medium |
| 02/13/1996 | US5491255 Process for the transesterification of dimethyl succinylsuccinate |
| 02/13/1996 | US5491235 Process for the preparation of organic pigments |
| 02/09/1996 | CA2155499A1 Process for the preparation of quinacridones from dihydroquinacridones in an aqueous medium |
| 11/15/1995 | EP0682090A1 Process for the preparation of quiacridone pigments |
| 10/10/1995 | US5457203 Oxidizing dihydroquinacridone using particle growth inhibitor |
| 09/26/1995 | US5453151 Colorfast, stable |
| 08/23/1995 | EP0667888A1 Pigment manufacturing process. |
| 08/22/1995 | CA1336775C Quinacridones having selectively adjusted triboelectric effects |
| 08/09/1995 | EP0666288A1 Process for the manufacture of quinacridone pigments |
| 08/04/1995 | CA2141725A1 Process for the preparation of quinacridone pigments |
| 08/02/1995 | EP0665272A1 Resinated 2,9-dimethylquinacridone |
| 07/26/1995 | CA2140837A1 Resinated 2,9-dimethylquinacridone |
| 07/12/1995 | EP0662497A1 Use of fatty acid taurides for dispersing polycyclic pigments |
| 06/13/1995 | US5424429 Preparation of pigmentary 2,9-dichloroquinacridone |
| 06/07/1995 | EP0656404A2 Compositions based on 2,9-dichloroquinacridone pigments |
| 06/02/1995 | CA2136912A1 Compositions based on 2,9-dichloroquinacridone pigments |
| 06/01/1995 | DE4339994A1 Ester exchange of di:methyl succinyl-succinate |
| 05/24/1995 | EP0654506A2 Process for the manufacture of synergetic mixtures of pigments |
| 05/24/1995 | EP0654472A1 Process for the production of 6,13-dihydroquinacridones and apparatus for use for the production |
| 05/23/1995 | CA2135596A1 Process for the preparation of synergistic pigment mixtures |
| 04/19/1995 | EP0648817A1 Novel fluorescent dyes |
| 04/19/1995 | EP0648733A2 Quinacridone synthesis and process for preparation of intermediates |
| 04/14/1995 | CA2117860A1 Fluorescent pigments |
| 03/16/1995 | CA2131946A1 Pigmentary synthesis of quinacridone solid solutions |
| 03/16/1995 | CA2131943A1 Preparation of pigmentary 2,9-dichloroquinacridone |
| 03/15/1995 | EP0643110A1 Pigmentary synthesis of quinacridone solid solutions |
| 03/15/1995 | EP0643109A1 Preparation of pigmentary 2,9-dichloroquinacridone |
| 02/07/1995 | US5387281 Compositions based on 2,9-Dichloroquinacridone pigments |
| 01/04/1995 | EP0632106A1 Process for the production of 2,5-di(arylamino)-3,6- dihydroterephthalic acid dialkyl ester, and process for the production of quinacridone from said ester as intermediate |
| 08/24/1994 | CA2116063A1 Stabilisation of organic pigments |
| 08/02/1994 | US5334727 Pigment system additives to improve rheology, transparency, |
| 05/11/1994 | WO1994010249A1 Pigment manufacturing process |
| 02/15/1994 | US5286863 Oxidation process for preparing quinacridone pigments |
| 01/25/1994 | US5281269 Aqueous process for preparation of modified beta quinacridone |
| 10/12/1993 | CA1323031C Thioquinacridones and isothioquinacridones, preparation and use thereof |
| 07/20/1993 | US5229515 Process for preparing modified β-quinacridone pigment |
| 06/29/1993 | US5223624 Yellowish-red color |
| 03/03/1993 | EP0530143A1 Modified gamma-quinacridone pigment |
| 03/03/1993 | EP0530142A1 Oxidation process for preparing quinacridone pigments |
| 02/23/1993 | CA2076281A1 Oxidation process for preparing quinacridone pigments |
| 12/09/1992 | EP0517663A1 Process for preparing modified beta-quinacridone pigment |
| 12/09/1992 | EP0517662A1 Aqueous process for preparation of modified beta quinacridone |
| 12/08/1992 | CA2070576A1 Process for preparing modified beta-quinacridone pigment |
| 12/08/1992 | CA2070559A1 Aqueous process for preparation of modified beta quinacridone |
| 08/11/1992 | US5137576 Quinacridones having selectively adjusted triboelectric effects |
| 07/22/1992 | EP0495338A1 2,9-Dichloroquinacridone-pigmented engineering plastics and coatings |
| 07/01/1992 | EP0493308A1 Quinacridone dispersion milling process |
| 05/13/1992 | EP0485337A1 Pyrazole-containing pigment derivatives |
| 04/02/1992 | DE4119100A1 New alpha-quinacridone cpds. for reddish pigment - prepd. from di:ethyl di:cyclohexane-di:one-di:carboxylate and aromatic amine cpd. |
| 03/10/1992 | US5095056 Heat resistance |
| 03/03/1992 | US5093497 Process for the preparation of a substituted or unsubstituted quinacridone |
| 01/28/1992 | US5084100 Quinacridone dispersion milling process |
| 06/05/1991 | EP0430875A2 Water-based coating materials containing specific modified organic pigments |