Patents by Inventor Nilanjan Chakrabarti

Nilanjan Chakrabarti 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).

  • Publication number: 20190031904
    Abstract: An aqueous, low-VOC/SVOC universal pigment preparation is provided, which contains (A) a pigment component; (B) a water-soluble additive containing at least one polyamine B, which is selected from the group consisting of polyvinylamines, poly-C2-C3-alkyleneimines, modified poly-C2-C3-alkyleneimines, melamines, modified melamines, poly-(C2-C4-alkyleneether) amines, polyetheramine polyols, and modified polyetheramine polyols; (C) an additive based on lecithin and/or an anionic additive based on a phosphoric ester and/or phosphonic ester; and (D) optionally further additives customary for producing an aqueous pigment preparation. The aqueous pigment preparation is suitable for coloring coating materials like paints, varnishes or renders, preferably for point-of-sale tinting (POS) or in in-plant tinting systems.
    Type: Application
    Filed: January 20, 2017
    Publication date: January 31, 2019
    Applicant: BASF SE
    Inventors: Hansulrich REISACHER, Nilanjan CHAKRABARTI, Steffen ONCLIN, Uwe MAUTHE
  • Patent number: 9040624
    Abstract: A colorant composition for tinting or coloring surface coverings or paint is. provided that has a low volatile organic compound (VOC) concentration, alkylphenoi ethoxylate surfactants (APE) free and hazardous air pollutants (HAPS) free. Additionally, the colorant composition has performance properties substantially equal to or better than tinters possessing high VOC concentrations. The colorant composition includes a colorant component, a dispersant including a polyamide, a surface active agent, water, and optional additives, The polyamide is a high molecular weight polyamide.having at least two anchoring amines, and the surface active agent includes phosphoric acid, phosphate esters, or salts thereof.
    Type: Grant
    Filed: October 1, 2009
    Date of Patent: May 26, 2015
    Assignee: BASF SE
    Inventors: Nilanjan Chakrabarti, Lee E. Young, Nancy Almasarweh, Shakera Thamanna, Christopher Flanders, William M. Wunch, Amrit P. Bindra
  • Publication number: 20120095128
    Abstract: A colorant composition for tinting or coloring surface coverings or paint is. provided that has a low volatile organic compound (VOC) concentration, alkylphenoi ethoxylate surfactants (APE) free and hazardous air pollutants (HAPS) free. Additionally, the colorant composition has performance properties substantially equal to or better than tinters possessing high VOC concentrations. The colorant composition includes a colorant component, a dispersant including a polyamide, a surface active agent, water, and optional additives, The polyamide is a high molecular weight polyamide. having at least two anchoring amines, and the surface active agent includes phosphoric acid, phosphate esters, or salts thereof.
    Type: Application
    Filed: October 1, 2009
    Publication date: April 19, 2012
    Applicant: BASF Corporation
    Inventors: Nilanjan Chakrabarti, Lee E. Young, Nancy Almasarweh, Shakera Thamanna, Christopher Flanders, William M. Wunch, Amrit P. Bindra