Patents by Inventor Babu N. Gaddam

Babu N. Gaddam 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).

  • Patent number: 11697753
    Abstract: An adhesion promoter comprises a reaction product of: a) a polyepoxide; b) an aminosilane represented by the formula HNR1R2. R1 and R2 independently represent —Z—SiL3. Each Z independently represents a divalent linking group having from 1 to 12 carbon atoms, and each L independently represents a hydrolyzable group; and c) an isocyanatosilane represented by the formula O?C?N—Z—SiL3, wherein Z and L are as previously defined. The adhesion promoter may be used to treat a surface of a substrate such as an abrasive particle, which may be included in a resin-bond abrasive article.
    Type: Grant
    Filed: June 6, 2019
    Date of Patent: July 11, 2023
    Assignee: 3M Innovative Properties Company
    Inventors: Hae-Seung H. Lee, Melissa C. Schillo-Armstrong, Babu N. Gaddam
  • Patent number: 11492460
    Abstract: Controlled radical initiators, reaction mixtures containing the controlled radical initiators and various ethylenically unsaturated monomers, polymeric materials formed from the reaction mixtures, crosslinkable compositions containing the polymeric materials, crosslinked compositions formed from the crosslinkable compositions, and articles containing the polymeric materials, the crosslinkable compositions, or the crosslinked compositions are provided. The controlled radical initiators are bis-dithiocarbamate or bis-dithiocarbonate compounds having a single carbon between the two dithiocarbamate or dithiocarbonate groups. Also attached to that single carbon is a ketone group.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: November 8, 2022
    Assignee: 3M Innovative Properties Company
    Inventors: Kevin M. Lewandowski, Stephen B. Roscoe, Babu N. Gaddam, Bryan T. Whiting, John L. Battiste, George W. Griesgraber
  • Patent number: 11390722
    Abstract: First articles with covalently attached thiocarbonylthio-containing groups are provided. More specifically, the first articles are a functionalized substrate that contains a solid polymeric substrate with a plurality of thiocarbonylthio-containing groups covalently attached directly to carbon atoms in a polymeric backbone of the solid polymeric substrate. Methods of making the first articles with covalently attached thiocarbonylthio-containing groups are provided. Additionally, second articles and methods of using the first articles to generate second articles with covalently attached polymeric chains are provided.
    Type: Grant
    Filed: December 14, 2018
    Date of Patent: July 19, 2022
    Assignee: 3M Innovative Properties Company
    Inventors: Jerald K. Rasmussen, Stephen B. Roscoe, Babu N. Gaddam, George W. Griesgraber, Daniel J. O'Neal, Eli Narveson
  • Patent number: 11319461
    Abstract: Controlled radical initiators, reaction mixtures containing the controlled radical initiators and various ethylenically unsaturated monomers, polymeric materials formed from the reaction mixtures, crosslinkable compositions containing the polymeric materials, crosslinked compositions formed from the crosslinkable compositions, and various articles are provided. The controlled radical initiators are bis-dithiocarbamate or bis-dithiocarbonate compounds having a carbonyl group between the two dithiocarbamate or dithiocarbonate groups.
    Type: Grant
    Filed: February 13, 2019
    Date of Patent: May 3, 2022
    Assignee: 3M Innovative Properties Company
    Inventors: Kevin M. Lewandowski, Stephen B. Roscoe, Babu N. Gaddam, Bryan T. Whiting, John L. Battiste
  • Publication number: 20220033345
    Abstract: Provided is an addition-fragmentation agent of the formula (I) where Ramine comprises a tertiary amine group; R2 linking group of valence a+2; Z is an ethylenically unsaturated polymerizable group; and subscript a is 0 or 1.
    Type: Application
    Filed: October 1, 2019
    Publication date: February 3, 2022
    Inventors: Ahmed S. Abuelyaman, Babu N. Gaddam, Afshin Falsafi, Tianyu Wu, Yizhong Wang, Randilynn B. Christensen, William H. Moser
  • Patent number: 11111320
    Abstract: Novel stress-reducing crosslinking oligomers that have application in dental restoratives, thin films, hardcoats, composites, adhesives, and other uses subject to stress reduction are described. The addition-fragmentation process of crosslinking results in a chain-transfer event that provides novel polymers that may be further functionalized. In addition, the addition-fragmentation oligomer comprises pendent functional groups that bond to a substrate by forming an ionic or covalent bond, or etch the substrate by chemically removing some material from the substrate.
    Type: Grant
    Filed: October 2, 2019
    Date of Patent: September 7, 2021
    Assignee: 3M Innovative Properties Company
    Inventors: William H. Moser, Ann R. Fornof, Guy D. Joly, Serkan Yurt, Larry R. Krepski, Ahmed S. Abuelyaman, Afshin Falsafi, Bradley D. Craig, Joel D. Oxman, Babu N. Gaddam
  • Publication number: 20210246345
    Abstract: An adhesion promoter comprises a reaction product of: a) a polyepoxide; b) an aminosilane represented by the formula HNR1R2. R1 and R2 independently represent —Z-SiL3. Each Z independently represents a divalent linking group having from 1 to 12 carbon atoms, and each L independently represents a hydrolyzable group; and c) an isocyanatosilane represented by the formula O=C?N—Z-SiL3, wherein Z and L are as previously defined. The adhesion promoter may be used to treat a surface of a substrate such as an abrasive particle, which may be included in a resin-bond abrasive article.
    Type: Application
    Filed: June 6, 2019
    Publication date: August 12, 2021
    Inventors: Hae-Seung H. Lee, Melissa C. Schillo-Armstrong, Babu N. Gaddam
  • Publication number: 20210101867
    Abstract: Controlled radical initiators, reaction mixtures containing the controlled radical initiators and various ethylenically unsaturated monomers, polymeric materials formed from the reaction mixtures, crosslinkable compositions containing the polymeric materials, crosslinked compositions formed from the crosslinkable compositions, and various articles are provided. The controlled radical initiators are bis-dithiocarbamate or bis-dithiocarbonate compounds having a carbonyl group between the two dithiocarbamate or dithiocarbonate groups.
    Type: Application
    Filed: February 13, 2019
    Publication date: April 8, 2021
    Inventors: Kevin M. Lewandowski, Stephen B. Roscoe, Babu N. Gaddam, Bryan T. Whiting, John L. Battiste
  • Publication number: 20210095097
    Abstract: Controlled radical initiators, reaction mixtures containing the controlled radical initiators and various ethylenically unsaturated monomers, polymeric materials formed from the reaction mixtures, crosslinkable compositions containing the polymeric materials, crosslinked compositions formed from the crosslinkable compositions, and articles containing the polymeric materials, the crosslinkable compositions, or the crosslinked compositions are provided. The controlled radical initiators are bis-dithiocarbamate or bis-dithiocarbonate compounds having a single carbon between the two dithiocarbamate or dithiocarbonate groups. Also attached to that single carbon is a ketone group.
    Type: Application
    Filed: December 12, 2018
    Publication date: April 1, 2021
    Inventors: Kevin M. Lewandowski, Stephen B. Roscoe, Babu N. Gaddam, Bryan T. Whiting, John L. Battiste, George W. Griesgraber
  • Publication number: 20210095088
    Abstract: First articles with covalently attached thiocarbonylthio-containing groups are provided. More specifically, the first articles are a functionalized substrate that contains a solid polymeric substrate with a plurality of thiocarbonylthio-containing groups covalently attached directly to carbon atoms in a polymeric backbone of the solid polymeric substrate. Methods of making the first articles with covalently attached thiocarbonylthio-containing groups are provided. Additionally, second articles and methods of using the first articles to generate second articles with covalently attached polymeric chains are provided.
    Type: Application
    Filed: December 14, 2018
    Publication date: April 1, 2021
    Inventors: Jerald K. Rasmussen, Stephen B. Roscoe, Babu N. Gaddam, George W. Griesgraber, Daniel J. O'Neal, Eli Narveson
  • Patent number: 10941234
    Abstract: Controlled radical initiators that are ketone-containing dithiocarbamate or ketone-containing dithiocarbonate compounds are used to form polymeric materials that have a single polymeric block or multiple polymeric blocks. Reaction mixtures containing controlled radical initiators and various ethylenically unsaturated monomers, polymeric materials formed from the reaction mixtures, crosslinkable compositions containing the polymeric materials, crosslinked compositions formed from the crosslinkable compositions, and articles containing the polymeric materials, the crosslinkable compositions, or the crosslinked compositions are provided.
    Type: Grant
    Filed: February 13, 2019
    Date of Patent: March 9, 2021
    Assignee: 3M Innovative Properties Company
    Inventors: Kevin M. Lewandowski, Stephen B. Roscoe, Babu N. Gaddam, Bryan T. Whiting, John L. Battiste, George W. Griesgraber
  • Patent number: 10913807
    Abstract: Crosslinkable polymeric materials, crosslinked polymeric materials, articles containing the crosslinkable polymeric materials or crosslinked polymeric materials, and methods of making the articles and various compositions are provided. More particularly, the crosslinkable composition contains a) a first polymeric material, which has terminal dithiocarbamate or dithiocarbonate groups, b) a crosslinking composition containing a chlorinated triazine crosslinking agent and/or a crosslinking monomer having two or more ethylenically unsaturated groups, and c) a thixotropic agent containing metal oxide particles. The crosslinkable composition may be printable or dispensed. In some embodiments, the crosslinked composition is a pressure-sensitive adhesive.
    Type: Grant
    Filed: December 14, 2018
    Date of Patent: February 9, 2021
    Assignee: 3M Innovative Properties Company
    Inventors: Serkan Yurt, Stephen B. Roscoe, George W. Griesgraber, Babu N. Gaddam, Kevin M. Lewandowski, Bryan T. Whiting, Haeen Sykora, Aaron T. Hedegaard, Jayshree Seth, Janet A. Venne
  • Publication number: 20200369820
    Abstract: Controlled radical initiators that are ketone-containing dithiocarbamate or ketone-containing dithiocarbonate compounds are used to form polymeric materials that have a single polymeric block or multiple polymeric blocks. Reaction mixtures containing controlled radical initiators and various ethylenically unsaturated monomers, polymeric materials formed from the reaction mixtures, crosslinkable compositions containing the polymeric materials, crosslinked compositions formed from the crosslinkable compositions, and articles containing the polymeric materials, the crosslinkable compositions, or the crosslinked compositions are provided.
    Type: Application
    Filed: February 13, 2019
    Publication date: November 26, 2020
    Inventors: Kevin M. Lewandowski, Stephen B. Roscoe, Babu N. Gaddam, Bryan T. Whiting, John L. Battiste, George W. Griesgraber
  • Publication number: 20200368694
    Abstract: Articles with covalently attached thiocarbonylthio-containing groups are provided. More specifically, the articles include a solid polymeric substrate with a plurality of thiocarbonylthio-containing groups covalently attached directly to a carbon atom in a polymeric backbone of the solid polymeric substrate. Methods of making the articles with covalently attached thiocarbonylthio-containing are provided. Additionally, methods of using these articles to generate further articles with covalently attached polymeric chains are provided.
    Type: Application
    Filed: December 14, 2018
    Publication date: November 26, 2020
    Inventors: Jerald K. Rasmussen, Stephen B. Roscoe, Babu N. Gaddam, George W. Griesgraber, Daniel J. O'Neal, Eli P. Narveson
  • Patent number: 10836934
    Abstract: Silicone-based elastomeric materials, articles containing the silicone-based elastomeric materials, reaction mixtures used to form the silicone-based elastomeric materials, and methods of making the silicone-based elastomeric materials are described. The silicone-based elastomeric materials are prepared by polymerizing silicone compounds having at least two ethylenically unsaturated groups in the presence of actinic radiation and a controlled radical initiator. The controlled radical initiators are bis-dithiocarbamate or bis-dithiocarbonate compounds having a single carbon between the two dithiocarbamate or dithiocarbonate groups. The silicone-based elastomeric materials typically have improved mechanical properties compared to silicone-based elastomeric materials formed by free radical polymerization reactions in the presence of conventional photoinitiators.
    Type: Grant
    Filed: September 14, 2018
    Date of Patent: November 17, 2020
    Assignee: 3M Innovative Properties Company
    Inventors: Jitendra S. Rathore, Babu N. Gaddam, George W. Griesgraber, Kevin M. Lewandowski, Stephen B. Roscoe
  • Patent number: 10822532
    Abstract: Silicone-based pressure-sensitive adhesives, reaction mixtures used to form the pressure-sensitive adhesives, methods of making the silicone-based pressure-sensitive adhesives, and articles containing the silicone-based pressure-sensitive adhesives are described. More particularly, the silicone-based pressure-sensitive adhesives include silicone-based elastomeric materials that are prepared by polymerizing a silicone compound having at least two ethylenically unsaturated groups in the presence of actinic radiation (e.g., ultraviolet radiation) and a controlled radical initiator. The controlled radical initiator is a bis-dithiocarbamate or bis-dithiocarbonate compound having a single carbon between the two dithiocarbamate or dithiocarbonate groups.
    Type: Grant
    Filed: September 14, 2018
    Date of Patent: November 3, 2020
    Assignee: 3M Innovative Properties Company
    Inventors: Jitendra S. Rathore, Babu N. Gaddam, George W. Griesgraber, Kevin M. Lewandowski, Stephen B. Roscoe, Payam Khodaparast
  • Publication number: 20200308321
    Abstract: Crosslinkable polymeric materials, crosslinked polymeric materials, articles containing the crosslinkable polymeric materials or crosslinked polymeric materials, and methods of making the articles and various compositions are provided. More particularly, the crosslinkable composition contains a) a first polymeric material, which has terminal dithiocarbamate or dithiocarbonate groups, b) a crosslinking composition containing a chlorinated triazine crosslinking agent and/or a crosslinking monomer having two or more ethylenically unsaturated groups, and c) a thixotropic agent containing metal oxide particles. The crosslinkable composition may be printable or dispensed. In some embodiments, the crosslinked composition is a pressure-sensitive adhesive.
    Type: Application
    Filed: December 14, 2018
    Publication date: October 1, 2020
    Inventors: Serkan Yurt, Stephen B. Roscoe, George W. Griesgraber, Babu N. Gaddam, Kevin M. Lewandowski, Bryan T. Whiting, Haeen Sykora, Aaron T. Hedegaard, Jayshree Seth, Janet A. Venne
  • Patent number: 10768528
    Abstract: A pattern article comprising a copolymer having polymerized units derived from a cleavable crosslinking monomer, to which a pattern is imparted by the release of incipient acid from a thermal acid generator or photoacid generator. The selective release of the acid provides a pattern of high crosslink density and low crosslink density as result of the incipient acid cleaving a portion of the crosslinks.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: September 8, 2020
    Assignee: 3M Innovative Properties Company
    Inventors: Jason D. Clapper, Dennis E. Vogel, Ann R. Fornof, Andrew R. Davis, Babu N. Gaddam
  • Publication number: 20200270494
    Abstract: Silicone-based pressure-sensitive adhesives, reaction mixtures used to form the pressure-sensitive adhesives, methods of making the silicone-based pressure-sensitive adhesives, and articles containing the silicone-based pressure-sensitive adhesives are described. More particularly, the silicone-based pressure-sensitive adhesives include silicone-based elastomeric materials that are prepared by polymerizing a silicone compound having at least two ethylenically unsaturated groups in the presence of actinic radiation (e.g., ultraviolet radiation) and a controlled radical initiator. The controlled radical initiator is a bis-dithiocarbamate or bis-dithiocarbonate compound having a single carbon between the two dithiocarbamate or dithiocarbonate groups.
    Type: Application
    Filed: September 14, 2018
    Publication date: August 27, 2020
    Inventors: Jitendra S. Rathore, Babu N. Gaddam, George W. Griesgraber, Kevin M. Lewandowski, Stephen B. Roscoe, Payam Khodaparast
  • Publication number: 20200248034
    Abstract: Silicone-based elastomeric materials, articles containing the silicone-based elastomeric materials, reaction mixtures used to form the silicone-based elastomeric materials, and methods of making the silicone-based elastomeric materials are described. The silicone-based elastomeric materials are prepared by polymerizing silicone compounds having at least two ethylenically unsaturated groups in the presence of actinic radiation and a controlled radical initiator. The controlled radical initiators are bis-dithiocarbamate or bis-dithiocarbonate compounds having a single carbon between the two dithiocarbamate or dithiocarbonate groups. The silicone-based elastomeric materials typically have improved mechanical properties compared to silicone-based elastomeric materials formed by free radical polymerization reactions in the presence of conventional photoinitiators.
    Type: Application
    Filed: September 14, 2018
    Publication date: August 6, 2020
    Inventors: Jitendra S. Rathore, Babu N. Gaddam, George W. Griesgraber, Kevin M. Lewandowski, Stephen B. Roscoe