Patents by Inventor Ramesh C. Kumar

Ramesh C. Kumar 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: 12091517
    Abstract: Compositions and films are described comprising a polylactic (PLA) polymer and a copolymer comprising a first moiety comprising a C12-C30 alkyl group and a second moiety that is miscible in the composition. Suitable first moieties include a C12-C30 alkyl (meth)acrylate or a polyvinyl alcohol comprising pendent C12-C30 alkyl groups. Suitable second moieties include C1-C10 (meth)acrylic acid or ester thereof, vinyl acetate and ethylene vinyl acetate. The aforementioned composition may be used to form a release layer of an adhesive article such as a pressure sensitive adhesive tape. The films may be a monolithic film or a film layer of a multilayer film. The release layer may be disposed upon a substrate layer that may also comprise PLA. The films are produced by melt extrusion of the aforementioned composition and may be oriented.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: September 17, 2024
    Assignee: 3M Innovative Properties Company
    Inventors: William W. Merrill, Jeffrey P. Kalish, Jacob D. Young, Ramesh C. Kumar, Sonja S. Mackey, Kanta Kumar, Adam R. Wohl, David J. Kinning, Michael D. Crandall, Ignatius A. Kadoma
  • Patent number: 11965120
    Abstract: A method of making a silicone gel adhesive is described comprising providing an acrylic polymer, the acrylic polymer comprising at least 50 wt.-% of polymerized units of C1-C32 (meth)acrylate ester monomer; providing at least one non-functional polydiorganosiloxane, hydroxy-functional polydiorganosiloxane, or a mixture thereof; combining the acrylic polymer and polydiorganosiloxane into a mixture; coating the mixture onto a substrate, and subjecting the mixture to radiation thereby crosslinking the mixture. Also described is a silicone gel adhesive comprising a crosslinked material at least one non-functional polydiorganosiloxane, hydroxy-functional polydiorganosiloxane, or a mixture thereof; and an acrylic polymer comprising at least 50 wt.-% of polymerized units of alkyl (meth)acrylate monomers and a gel content of at least 20 wt.-%.
    Type: Grant
    Filed: April 3, 2019
    Date of Patent: April 23, 2024
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Amanda C. Engler, Kiu-Yuen Tse, Ramesh C. Kumar, Adam R. Wohl
  • Publication number: 20230272244
    Abstract: A method of making a release coated article is described comprising: providing a release coating composition comprising at least 50 wt. % of a mixture of ethylenically unsaturated monomers based on the total ethylenically unsaturated components; wherein the mixture comprises monomer(s) with a linear alkyl group with at least 18 carbon atoms, and monomer(s) with a branched alkyl group with 7 to 31 carbon atoms, and crosslinking component(s) comprising at least two ethylenically unsaturated groups. The method comprises applying the release coating to a major surface of a substrate and polymerizing the monomer(s) and crosslinking component(s) of the release coating. The monomer(s) with linear alkyl groups and branched alkyl groups are typically present at a weight ratio such that the release coating is a liquid at 25° C. Also described are release coating compositions and articles.
    Type: Application
    Filed: July 26, 2021
    Publication date: August 31, 2023
    Inventors: Michael A. Semonick, Kathryn S. Damien, Ramesh C. Kumar
  • Patent number: 11576845
    Abstract: Disclosed herein are methods that include contacting a skin surface with a first liquid composition; and then contacting in the skin surface with a cationic coated article loaded with a second liquid composition, while at least some portion of the first liquid composition remains on the skin surface, wherein one or both of the first liquid composition or the second liquid composition includes acrylate copolymer particles dispersed therein, the acrylate copolymer particles including the reaction product of a reaction mixture, the reaction mixture including monomers, the monomers including from about 5 wt % to about 50 wt % of at least one high Tg monomer where the wt % of the high Tg monomer is with respect to the total weight of the monomers in the reaction mixture; and from about 20 wt % to about 80 wt % of at least one low Tg monomer where the wt % of the low Tg monomer is with respect to the total weight of the monomers in the reaction mixture, wherein the particles have a number average diameter of at lea
    Type: Grant
    Filed: January 2, 2018
    Date of Patent: February 14, 2023
    Assignee: 3M Innovative Properties Company
    Inventors: Ranjani V. Parthasarathy, Ramesh C. Kumar, Matthew T. Scholz, Steven P. Swanson, Andrew W. Vail, Jerald K. Rasmussen, George W. Griesgraber, Catherine D. Heapy
  • Publication number: 20220228005
    Abstract: Described herein is a latex coating composition comprising particles of of the polymer are of formula I, wherein R3 is H or CH3, L is an alkylene group comprising 1-4 carbon atoms, R1 and R2 are independently selected from an alkyl group comprising 1 to 3 carbon atoms, n is an integer from 11 to 21, and A is a counter anion.
    Type: Application
    Filed: June 15, 2020
    Publication date: July 21, 2022
    Inventors: Clinton G. Wiener, Mahfuza B. Ali, Maria A. Appeaning, Ibrahim A. El Hedok, Phillip H. Henna, Ramesh C. Kumar
  • Patent number: 11286405
    Abstract: A method of making an adhesive article is described comprising melt extruding a core film layer comprising a composition comprising at least 50% of a polylactic acid polymer. The method further comprises melt extruding an adhesive layer on a major surface of the core film layer such that regions of interdiffusion are present between the core film layer and adhesive layer. The adhesive layer may comprise C1-C10 (meth)acrylic acid or ester thereof, vinyl acetate, ethylene vinyl acetate, hydrolysed polyvinyl alcohol and combinations thereof. The adhesive layer may also be a pressure sensitive adhesive. The method further comprises melt extruding a release film layer on an opposing major surface of the core film layer. The layers are sequentially extruded or co-extruded and can be uniaxially or biaxially oriented.
    Type: Grant
    Filed: December 1, 2017
    Date of Patent: March 29, 2022
    Assignee: 3M Innovative Properties Company
    Inventors: William W. Merrill, Jeffrey P. Kalish, Jacob D. Young, Ramesh C. Kumar, Sonja S. Mackey, Kanta Kumar, Ignatius A. Kadoma, Michael D. Crandall, Adam R. Wohl
  • Patent number: 10988578
    Abstract: A composition, and article including such composition, wherein the composition includes a silsesquioxane polymer and a free siloxane; wherein the silsesquioxane polymer includes a three-dimensional network of Formula (I): wherein: each R1 and R2 is independently a (C1-C4)alkyl; each L1 and L2 is independently a single bond, an alkylene, or an alkylene bonded to a group selected from oxy, thio, carbonyl, —NH—, and combinations thereof; each R3 is independently a linear (C14-C100)alkyl; each R5 is independently a (C1-C30)alkyl, a (C1-C30)fluorinated alkyl, or a (C2-C30)heteroalkyl having at least one oxygen, sulfur, or —NH— group; with the proviso that L1, L2, and R5 are selected such that each Si atom is directly bonded to an alkylene or an alkyl; m is an integer of at least 2; n is an integer of 0 or above; m+n is an integer of at least 10; each oxygen atom at an asterisk (*) is bonded to another Si atom within the three-dimensional network; and the silsesquioxane polymer is a solid at 25° C.
    Type: Grant
    Filed: September 13, 2018
    Date of Patent: April 27, 2021
    Assignee: 3M Innovative Properties Company
    Inventors: Jitendra S. Rathore, Ramesh C. Kumar, Chetan P. Jariwala
  • Patent number: 10941252
    Abstract: A copolymer composition that includes a silicone copolymer, methods of making the composition, and articles that include the composition, wherein the copolymer composition includes a silicone copolymer having a backbone composition that includes: silicone segments in an amount of 5 wt-% to 40 wt-%, based on the total weight of the silicone copolymer; hydrophilic segments in an amount of 40 wt-% to 75 wt-%, based on the total weight of the silicone copolymer; and reinforcing segments in an amount of 5 wt-% to 30 wt-%, based on the total weight of the silicone copolymer, wherein the reinforcing segments are derived from the reaction of one or more chain extenders with one or more multi-functional isocyanates, multi-functional carboxylic acids, multi-functional anhydrides, multi-functional esters, and/or multi-functional acid halides; wherein the silicone segments, hydrophilic segments, and reinforcing segments are connected through urea, urethane, amide, and/or oxamide linkages; wherein the hydrophilic segments
    Type: Grant
    Filed: October 23, 2017
    Date of Patent: March 9, 2021
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Hannah C. Cohen, Amanda C. Engler, Ranjani V. Parthasarathy, Haoming Rong, Ramesh C. Kumar, Matthew T. Scholz, James P. Dizio, Audrey A. Sherman, Richard G. Hansen, Douglas A. Hanggi, Dale J. Case, David Duane Johnson
  • Publication number: 20210061956
    Abstract: A composition, and article including such composition, wherein the silsesquioxane polymer includes a three-dimensional network of Formula (I): wherein: each R1 and R2 is independently a (C1-C4)alkyl; each L1 and L2 is independently a single bond, an alkylene, or an alkylene bonded to a group selected from oxy, thio, carbonyl, —NH—, and combinations thereof; each R3 is independently a linear (C14-C100)alkyl; each R5 is independently a (C1-C30)alkyl, a (C1-C30)fluorinated alkyl, or a (C2-C30)heteroalkyl having at least one oxygen, sulfur, or —NH— group; with the proviso that L1, L2, and R5 are selected such that each Si atom is directly bonded to an alkylene or an alkyl; m is an integer of at least 2; n is an integer of 0 or above; m+n is an integer of at least 10; each oxygen atom at an asterisk (*) is bonded to another Si atom within the three-dimensional network; and the silsesquioxane polymer is a solid at 25° C.
    Type: Application
    Filed: September 13, 2018
    Publication date: March 4, 2021
    Inventors: Jitendra S. Rathore, Ramesh C. Kumar, Chetan P. Jariwala
  • Publication number: 20210009879
    Abstract: A method of making a silicone gel adhesive is described comprising providing an acrylic polymer, the acrylic polymer comprising at least 50 wt.-% of polymerized units of C1-C32 (meth)acrylate ester monomer; providing at least one non-functional polydiorganosiloxane, hydroxy-functional polydiorganosiloxane, or a mixture thereof; combining the acrylic polymer and polydiorganosiloxane into a mixture; coating the mixture onto a substrate, and subjecting the mixture to radiation thereby crosslinking the mixture. Also described is a silicone gel adhesive comprising a crosslinked material at least one non-functional polydiorganosiloxane, hydroxy-functional polydiorganosiloxane, or a mixture thereof; and an acrylic polymer comprising at least 50 wt.-% of polymerized units of alkyl (meth)acrylate monomers and a gel content of at least 20 wt.-%.
    Type: Application
    Filed: April 3, 2019
    Publication date: January 14, 2021
    Inventors: Amanda C. Engler, Kiu-Yuen Tse, Ramesh C. Kumar, Adam R. Wohl
  • Patent number: 10889691
    Abstract: A silsesquioxane polymer, composition, method, and article including such polymer, wherein the polymer includes a three-dimensional network of Formula (I): wherein: each R1 and R2 is independently a (C1-C4)alkyl; each L1 and L2 is independently in a single bond, an alkylene, or an alkylene bonded to a group selected from oxy, thio, carbonyl, —NH—, and combinations thereof; each R3 is independently a linear (C14-C100)alkyl; each R4 is independently a (C1-C30)alkyl, (C2-C30)heteroalkyl having at least one oxygen, sulfur, or —NH— group, or a (C1-C30)alkyl substituted with a fluoro, thiol, isocyanato, cyanato, hydroxyl, glycidoxy, or epoxy group; with the proviso that L1, L2, and R4 are selected such that each Si atom is directly bonded to an alkylene or an alkyl; m is an integer of at least 3; n is an integer of 0 or above; m+n is an integer of at least 3; each oxygen atom at an asterisk (*) is bonded to another Si atom within the three-dimensional network; and the silsesquioxane polymer is a solid at 25° C.
    Type: Grant
    Filed: September 13, 2018
    Date of Patent: January 12, 2021
    Assignee: 3M Innovative Properties Company
    Inventors: Jitendra S. Rathore, Chetan P. Jariwala, Lin Chen, Ramesh C. Kumar
  • Patent number: 10865330
    Abstract: Segmented silicone polyamide block copolymers that comprise dimer acid residues and articles containing the same.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: December 15, 2020
    Assignee: 3M Innovative Properties Company
    Inventors: Rajdeep S. Kalgutkar, Ramesh C. Kumar, David S. Hays, Joseph A. Severance, Timothy M. Hackbarth
  • Publication number: 20200385531
    Abstract: A silsesquioxane polymer, composition, method, and article including such polymer, wherein the polymer includes a three-dimensional network of Formula (I): wherein: each R1 and R2 is independently a (C1-C4)alkyl; each L1 and L2 is independently in a single bond, an alkylene, or an alkylene bonded to a group selected from oxy, thio, carbonyl, —NH—, and combinations thereof; each R3 is independently a linear (C14-C100)alkyl; each R4 is independently a (C1-C30)alkyl, (C2-C30)heteroalkyl having at least one oxygen, sulfur, or —NH— group, or a (C1-C30)alkyl substituted with a fluoro, thiol, isocyanato, cyanato, hydroxyl, glycidoxy, or epoxy group; with the proviso that L1, L2, and R4 are selected such that each Si atom is directly bonded to an alkylene or an alkyl; m is an integer of at least 2; n is an integer of 0 or above; m+n is an integer of at least 3; each oxygen atom at an asterisk (*) is bonded to another Si atom within the three-dimensional network; and the silsesquioxane polymer is a solid at 25° C.
    Type: Application
    Filed: September 13, 2018
    Publication date: December 10, 2020
    Inventors: Jitendra S. Rathore, Chetan P. Jariwala, Lin Chen, Ramesh C. Kumar
  • Patent number: 10858516
    Abstract: A silsesquixane polymer, a composition including such silsesquixane polymer, and an article including such polymer or composition, wherein the composition includes a silsesquioxane polymer and a free siloxane; wherein the silsesquioxane polymer includes a three-dimensional network of Formula (I): wherein: each R1 and R2 is independently a (C1-C4)alkyl; each L1 is independently a single bond, an alkylene, or an alkylene bonded to a group selected from oxy, thio, carbonyl, —NH—, and combinations thereof; each R3 is independently a linear (C14-C100)alkyl; with the proviso that L1 is selected such that each Si atom is directly bonded to an alkylene or an alkyl; m is an integer of at least 2; n is an integer of at least 1; m+n is an integer of at least 10; each oxygen atom at an asterisk (*) is bonded to another Si atom within the three-dimensional network; and the silsesquioxane polymer is a solid at 25° C.
    Type: Grant
    Filed: September 13, 2018
    Date of Patent: December 8, 2020
    Assignee: 3M Innovative Properties Company
    Inventors: Jitendra S. Rathore, Ramesh C. Kumar, Chetan P. Jariwala
  • Publication number: 20200270457
    Abstract: A silsesquixane polymer, a composition including such silsesquixane polymer, and an article including such polymer or composition, wherein the composition includes a silsesquioxane polymer and a free siloxane; wherein the silsesquioxane polymer includes a three-dimensional network of Formula (I): wherein: each R1 and R2 is independently a (C1-C4)alkyl; each L1 is independently a single bond, an alkylene, or an alkylene bonded to a group selected from oxy, thio, carbonyl, —NH—, and combinations thereof; each R3 is independently a linear (C14-C100)alkyl; with the proviso that L1 is selected such that each Si atom is directly bonded to an alkylene or an alkyl; m is an integer of at least 2; n is an integer of at least 1; m+n is an integer of at least 10; each oxygen atom at an asterisk (*) is bonded to another Si atom within the three-dimensional network; and the silsesquioxane polymer is a solid at 25° C.
    Type: Application
    Filed: September 13, 2018
    Publication date: August 27, 2020
    Inventors: Jitendra S. Rathore, Ramesh C. Kumar, Chetan P. Jariwala
  • Patent number: 10723815
    Abstract: Methods for preparing silicone-containing polymers by essentially adiabatic polymerization methods are disclosed. The polymerization system includes free radically polymerizable monomers. The monomers include ethylenically unsaturated silicone-containing monomers and/or mercapto-functional silicones as well as additional free radically polymerizable monomers. The silicone-containing polymers are useful as adhesives or release materials.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: July 28, 2020
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Audrey A. Sherman, Mark F. Ellis, Ramesh C. Kumar, Sonja S. Mackey, Richard L. Peloquin, Jeffrey O. Emslander
  • Publication number: 20200198292
    Abstract: The disclosure relates to articles comprising a substrate, a pressure sensitive adhesive, and a release layer, wherein the release layer comprises at least one silicone carbonate polymer.
    Type: Application
    Filed: February 28, 2020
    Publication date: June 25, 2020
    Applicant: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: PHILLIP H. HENNA, RAMESH C. KUMAR
  • Patent number: 10640614
    Abstract: Segmented silicone polyamide block copolymers that comprise dimer acid residues and articles containing the same.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: May 5, 2020
    Assignee: 3M Innovative Properties Company
    Inventors: Rajeep S. Kalgutkar, Ramesh C. Kumar, David S. Hays, Joseph A. Severance, Timothy M. Hackbarth
  • Publication number: 20200109314
    Abstract: A method of making an adhesive article is described comprising melt extruding a core film layer comprising a comport comprising at least 50% of a polylactic acid polymer. The method further comprises melt extruding an adhesive layer on a major surface of the core film layer such that regions of interdiffusion are present between the core film layer and adhesive layer. The adhesive layer may comprise C1-C10 (meth)acrylic acid or ester thereof, vinyl acetate, ethylene vinyl acetate, hydrolysed polyvinyl alcohol and combinations thereof. The adhesive layer may also be a pressure sensitive adhesive. The method further comprises melt extruding a release film layer on an opposing major surface of the core film layer. The layers are sequentially extruded or co-extruded and can be uniaxially or biaxially oriented. Articles comprising a core film layer comprising a composition comprising at least 50% of a polylactic acid polymer and an adhesive layer disposed on a major surface of the core layer are also described.
    Type: Application
    Filed: December 1, 2017
    Publication date: April 9, 2020
    Inventors: William W. Merrill, Jeffrey P. Kalish, Jacob D. Young, Ramesh C. Kumar, Sonja S. Mackey, Kanta Kumar, Ignatius A. Kadoma, Michael D. Crandall, Adam R. Wohl
  • Patent number: 10611123
    Abstract: The disclosure relates to articles comprising a substrate, a pressure sensitive adhesive, and a release layer, wherein the release layer comprises at least one silicone carbonate polymer.
    Type: Grant
    Filed: January 28, 2016
    Date of Patent: April 7, 2020
    Assignee: 3M Innovative Properties Company
    Inventors: Phillip H. Henna, Ramesh C. Kumar