Patents by Inventor Bruno Piastra
Bruno Piastra has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7307170Abstract: The epindolidione compounds of the general formula (I) in which A?, R2 and A have the meanings given in claim 1, are outstanding pigments which are notable in particular for better migration, light and solvent fastnesses, better heat stability and enhanced colouring power and also better dispersibility and capability to be brought into pigment form. The invention also relates to a process for preparing these epindolidione compounds and to their use a colorants for colouring polymer compositions or paper pulps, as colorants in electrophotographic toners and developers, as colorants in ink-jet inks, as colorants in the coatings industry, as colorants for textile printing or as a printing ink in the graphical industry, as colorants in cosmetics.Type: GrantFiled: February 6, 2002Date of Patent: December 11, 2007Assignee: Clariant Finance (BVI) LimitedInventors: Bansi Lal Kaul, Bruno Piastra, Valérie Wolf, Frank Prokschy, Martin Ulrich Schmidt
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Publication number: 20060118004Abstract: The present invention relates to a pigment formulation which comprises at least one organic pigment selected from C.I. Pigment Red 279 or C.I. Pigment Orange 80 (both thiazine indigo pigments) and at least one pigment-dispersing agent. The invention further relates to a process for preparing said formulation as well as to a method of pigmenting high molecular weight organic material of natural or synthetic origin with said formulation.Type: ApplicationFiled: October 29, 2003Publication date: June 8, 2006Inventors: Bruno Piastra, Hans Metz
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Publication number: 20040138451Abstract: The epindolidione compounds of the general formula (I) 1Type: ApplicationFiled: January 22, 2004Publication date: July 15, 2004Inventors: Bansi Lal Kaul, Bruno Piastra, Valerie Wolf, Frank Prokschy, Martin Ulrich Schmidt
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Patent number: 6649758Abstract: A process for preparing symmetrical or asymmetrical trans-thiazineindigo pigments of the formula (1) which comprises a) condensing, in an aqueous medium, a compound of the formula (2) with a compound of the formula (3a) or (3b) or a compound of the formula (4) with a compound of the formula (3a) and/or (3b) by maintaining the reaction mixture at a temperature between 30 and 65° C. for at least 1 hour and then b) maintaining the reaction mixture at a temperature between 100 and 180° C. and a pressure between 2 and 50 bar for at least 1 hour in the presence of an amide.Type: GrantFiled: June 21, 2001Date of Patent: November 18, 2003Assignee: Clariant Finance (BVI) LimitedInventors: Petra Maria Rothe, Leonhard Unverdorben, Bruno Piastra
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Patent number: 6638996Abstract: Use of the pigment of formula (I) in which X stands for Cl or CH3, and of formula (II) wherein R is phenyl or C12H25, for the coloration of polyolefins which do not warp.Type: GrantFiled: August 11, 2000Date of Patent: October 28, 2003Assignee: Clariant Finance (BVI) LimitedInventors: Bansi Lal Kaul, Bruno Piastra, Till Borchert
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Patent number: 6540820Abstract: Compounds of the formula: where R1, R2, R3, R4, R5, R6, R7, R8, R′5, R′6, R′7, R′8 are hydroxy —NO2, —CN, —CF3, —CONH2, C1-12alkyl, phenyl, naphthyl, phenanthryl, anthryl, R9R10N—, R9—O—or R9—S—, —CONHR10, —CONR9R10 in which R9 and R10 are C1-C6-alkyl, C6-C10-aryl, (C6-C10)-aryl-(C1-C6)-alkyl or (C1-C6)-alkyl-(C6-C10)-aryl, in which the alkyl and/or aryl radicals can optionally be substituted by hydroxyl, C1-C6-alkoxy, C6-C10-aryloxy or halogen; and optionally, two adjacent groups can form an isocyclic or heterocyclic group; are eminently suitable for the mass coloring of polymers, in particular polar polymers, for coloring toners, powders and powder coating materials as well as for coloring ink-jet inks.Type: GrantFiled: June 8, 2000Date of Patent: April 1, 2003Assignee: Clariant Finance (BVI) LimitedInventors: Bansi Lal Kaul, Bruno Piastra, Valérie Wolf
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Patent number: 6515123Abstract: The invention is directed to carbamate group containing non chloranil based triphendioxazine compounds useful as pigments which are readily convertible into the corresponding triphendioxazine pigments without carbamate.Type: GrantFiled: February 9, 2001Date of Patent: February 4, 2003Assignee: Clariant Finance (BVI) LimitedInventors: Bansi Lal Kaul, Bruno Piastra, Pascal Steffanut
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Patent number: 6512115Abstract: The invention relates to a process for preparing triphendioxazine compounds by cyclizing the intermediates (IV) in the presence of manganese oxide and sulfuric acid to form compounds of the general formula (I) a process for condensing compounds of the general formula (II) with compounds of the general formula (III) to form the chlorine-free intermediates (IV) and also compounds of the general formula (IV).Type: GrantFiled: March 6, 2001Date of Patent: January 28, 2003Assignee: Clariant Finance (BVI) LimitedInventors: Bansi Lal Kaul, Bruno Piastra, Pascal Steffanut
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Patent number: 6482817Abstract: The invention provides hybrid pigments containing: (a) at least one benzimidazolone triphenodioxazine compound of the formula (I) and (b) at least one pyrrolo-[3,4-c]-pyrrole compound, or (c) at least one thiazine-indigo compound, or (d) at least one quinacridone compound or (e) at least one copper phthalocyanine compound and a process for the preparation of such hybrid pigments and their use for the mass pigmentation of substrates, as colorants in electrophotographic toners and developers, in powders and powder coating materials, in ink-jet inks and in cosmetic compositions.Type: GrantFiled: April 19, 2000Date of Patent: November 19, 2002Assignee: Clariant Finance (BVI) LimitedInventors: Bansi Lal Kaul, Bruno Piastra, Carsten Plug, Pascal Steffanut, Roland Born
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Patent number: 6472527Abstract: New heterocyclic compounds are disclosed which are used as intermediates for the preparation of trans-thiazine-indigo pigments which are in part new compounds and can be used for the mass pigmentation of organic substrates. Also disclosed are different environmentally friendly water-based processes for the preparation of the new heterocyclic compounds and the corresponding pigments.Type: GrantFiled: March 15, 2000Date of Patent: October 29, 2002Assignee: Clariant Finance (BVI) LimitedInventors: Till Borchert, Bansi Lal Kaul, Bruno Piastra, Valérie Wolf
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Patent number: 6375732Abstract: Hybrid pigments of diketopyrrolo[3,4-c]pyrrole pigments and pigments bearing “acid” hydrogens like —NH, —OH or —CONH— groups, a process for the manufacturing of the hybrid diketopyrrolo[3,4-c]pyrrole pigments with pigments bearing “acid” hydrogens like —NH, — OH or —CONH— groups and their use as a pigment.Type: GrantFiled: March 30, 2000Date of Patent: April 23, 2002Assignee: Clariant Finance (BVI) LimitedInventors: Bansi Lal Kaul, Bruno Piastra, Valérie Wolf
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Patent number: 6339084Abstract: A process of forming the cis- or the trans-isomers of thiazine-indigo compounds comprising the step of reacting o-aminomercapto-carbocyclic or -heterocyclic compounds with a maleic acid or fumaric acid derivative in the presence of an aqueous system. The invention further relates to a process of converting cis-isomers of thiazine-indigo compounds into the trans-isomers being pigments. The invention also relates to the cis-isomers of thiazine-indigo compounds of formula I as defined in claim 14 which are new compounds.Type: GrantFiled: July 19, 2000Date of Patent: January 15, 2002Assignee: Clariant Finance (BVI) LimitedInventors: Bansi Lal Kaul, Bruno Piastra
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Publication number: 20020004596Abstract: A process for preparing symmetrical or asymmetrical trans-thiazineindigo pigments of the formula (1) 1Type: ApplicationFiled: June 21, 2001Publication date: January 10, 2002Applicant: Clariant GmbHInventors: Petra Maria Rothe, Leonhard Unverdorben, Bruno Piastra
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Publication number: 20010031864Abstract: The invention relates to a process for preparing triphendioxazine compounds by cyclizing the intermediates (IV) 1Type: ApplicationFiled: March 6, 2001Publication date: October 18, 2001Applicant: CLARIANT FINANCE (BVI) LIMITEDInventors: Bansi Lal Kaul, Bruno Piastra, Pascal Steffanut
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Publication number: 20010031863Abstract: Carbamate group-containing triphendioxazine compounds of the formula (I) 1Type: ApplicationFiled: February 9, 2001Publication date: October 18, 2001Applicant: CLARIANT FINANCE (BVI) LIMITEDInventors: Bansi Lai Kaul, Bruno Piastra, Pascal Steffanut
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Patent number: 6277536Abstract: Compounds of the formula (I) in which the substituents are as defined in claim 1 are valuable colorants for the mass coloring of polymers, with fluorescence property, in electrophotographics toners and developers, in powders coating materials and ink-jet inks.Type: GrantFiled: November 3, 1999Date of Patent: August 21, 2001Assignee: Clariant Finance (BVI) LimitedInventors: Bruno Piastra, Bansi Lal Kaul, Jean Christoph Graciet
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Patent number: 6214989Abstract: Carbamate group-containing triphendioxazine compounds of the formula (I) where the nuclei designated A and B, as defined in claim 1, contain fused-on rings and R1, R2 and R3 have the meanings specified in claim 1, are good pigments and are convertible into the corresponding triphendioxazine pigments without carbamate groups.Type: GrantFiled: March 24, 1999Date of Patent: April 10, 2001Assignee: Clariant International, Ltd. MuttenzInventors: Bansi Lal Kaul, Bruno Piastra
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Patent number: 6200378Abstract: A compound according to the formula (I) wherein R1 and R2 are independently the atoms necessary to complete the formation of a substituted or unsubstituted aromatic or aliphatic carbocyclic or heterocyclic ring system and R3 and R4 have the meaning indicated in claim 1, a new process for the preparation of such a compound, solid solutions and mixtures comprising such a compound and the use of a compound of formula (I) as a pigment.Type: GrantFiled: July 23, 1999Date of Patent: March 13, 2001Assignee: Clariant Finance (BVIØ) LimitedInventors: Bruno Piastra, Bansi Lal Kaul
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Patent number: 6046335Abstract: Compounds of the formula (I) ##STR1## in which R.sub.1 and R.sub.2 are identical or different and are hydrogen, C.sub.1 -C.sub.6 -alkyl, C.sub.6 -C.sub.10 -aryl, (C.sub.6 -C.sub.10)-aryl-(C.sub.1 -C.sub.6)-alkyl or (C.sub.1 -C.sub.6)-alkyl-(C.sub.6 -C.sub.10)-aryl, it being possible for the alkyl and/or aryl radicals to be substituted by hydroxyl, C.sub.1 -C.sub.6 -alkoxy, C.sub.6 -C.sub.10 -aryloxy or halogen,with the proviso that R.sub.1 and R.sub.2 are not simultaneously hydrogen,R.sub.3 is a radical of the formula (II) or (III) ##STR2## in which Y and R.sub.5 are as defined in the description, are valuable colorants for the mass coloring of polymers, in electrophotographic toners and developers, in powder coating materials and in ink-jet inks.Type: GrantFiled: October 19, 1998Date of Patent: April 4, 2000Assignee: Clariant BVIInventors: Patrick Boeglin, Bansi Lal Kaul, Bruno Piastra