Patents Assigned to PRC
  • Ionic liquid catalysts in sulfur-containing polymer compositions
    Patent number: 10035926
    Abstract: Compositions comprising thiol-terminated sulfur-containing prepolymers, curing agents reactive with the thiol-terminated sulfur-containing prepolymers, and ionic liquid catalysts, useful in aerospace sealant applications are disclosed. The use of ionic liquid catalysts provides curable sealant compositions having an extended working time and a rapid cure rate.
    Type: Grant
    Filed: April 22, 2016
    Date of Patent: July 31, 2018
    Assignee: PRC—DeSoto International, Inc.
    Inventors: Amy Liane Toolis, Lawrence G. Anderson, Brianne N. Sawders-Georgic
  • Phosphine-catalyzed, michael addition-curable sulfur-containing polymer compositions
    Patent number: 10011751
    Abstract: Compositions comprising Michael acceptor-terminated sulfur-containing prepolymers, thiol-terminated sulfur-containing prepolymers, and e phosphine catalysts useful in aerospace sealant applications are disclosed. The compositions exhibit extended pot life, cure rapidly following activation, and provide cured sealants having improved properties useful in aerospace sealant applications.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: July 3, 2018
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Lawrence G. Anderson, Juexiao Cai, Mark P. Bowman, Renhe Lin
  • Blocked 1,8-diazabicyclo[5.4.0]undec-7-ene bicarbonate catalyst for aerospace sealants
    Patent number: 9988487
    Abstract: Compositions comprising sulfur-containing prepolymers such as polythioether prepolymers, polyepoxides, and a blocked 1,8-diazabicyclo[5.4.0]undec-7-ene bicarbonate catalyst useful as aerospace sealants are disclosed. The compositions exhibit extended working time and the curing rate can be tailored for specific applications.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: June 5, 2018
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Hongying Zhou, Juexiao Cai, Renhe Lin
  • Moisture-curable fuel-resistant sealant systems
    Patent number: 9951252
    Abstract: Sealant systems that are pre-applied to a part to be sealed include a layer of an uncured moisture-curable sealant and a frangible barrier coating applied over the uncured moisture-curable sealant. During assembly, the barrier coating breaks to expose the moisture-curable sealant to moisture to initiate the curing reaction. The moisture-curable sealant systems are suitable for aerospace applications and include sulfur-containing prepolymers. Various curing chemistries can be used.
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: April 24, 2018
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Bruce Virnelson, Renhe Lin
  • Prepolymers exhibiting rapid development of physical properties
    Patent number: 9920006
    Abstract: Hydroxyl-containing bis(alkenyl) ethers can be incorporated into the backbone of polythioether prepolymers and can be used as curing agents in thiol-terminated polythioether prepolymer compositions. Cured sealants prepared using compositions containing hydroxyl-containing bis(alkenyl) ether-containing polythioether prepolymers and/or hydroxyl-containing bis(alkenyl) ether curing agents exhibit improved physical properties such as rapid curing and compatibility with fillers suitable for use in aerospace sealant applications.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: March 20, 2018
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Weibin Cui, Renhe Lin
  • Urethane-modified prepolymers containing pendent alkyl groups, compositions and uses thereof
    Patent number: 9902799
    Abstract: Adducts and prepolymers comprising pendent alkyl groups are disclosed. Polythiol adducts prepared by reacting a polythiol with a ketone and urethane-extended polythiol adducts. The polythiol adducts can be terminated with isocyanate groups. Compositions comprising the isocyanate-terminated polythiol adducts, isocyanate-terminated sulfur-containing prepolymers, and diisocyanates can be combined with polyamine or polyepoxide curing agents to provide curable compositions. Cured compositions are suitable for aerospace coating and sealant applications. The compositions can also include a low specific gravity filler and, when cured, meet the requirements of aerospace sealant applications.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: February 27, 2018
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Razmik Boghossian, Ahmed Sharaby
  • URETHANE/UREA-CONTAINING BIS(ALKENYL) ETHERS, PREPOLYMERS PREPARED USING URETHANE/UREA-CONTAINING BIS(ALKENYL) ETHERS, AND USES THEREOF
    Publication number: 20170369737
    Abstract: Urethane/urea-containing bis(alkenyl) ethers can be incorporated into the backbone of polythioether prepolymers and can be used as curing agents in thiol-terminated polythioether prepolymer compositions. Cured sealants prepared using compositions containing urethane/urea-containing bis(alkenyl) ether-containing polythioether prepolymers and/or urethane/urea-containing bis(alkenyl) ether curing agents exhibit improved physical properties suitable for use in aerospace sealant applications.
    Type: Application
    Filed: June 28, 2016
    Publication date: December 28, 2017
    Applicant: PRC-DeSoto International, Inc.
    Inventors: WEIBIN CUI, RENHE LIN
  • Reactive antioxidants, antioxidant-containing prepolymers, and compositions thereof
    Patent number: 9777139
    Abstract: Reactive antioxidants, antioxidant-containing prepolymers, compositions containing reactive antioxidants and antioxidant-containing prepolymers, methods of synthesizing reactive antioxidants and reactive antioxidant-containing prepolymers and the use of reactive antioxidants and antioxidant-containing prepolymers in aerospace sealant applications are disclosed. Reactive antioxidants and antioxidant-containing prepolymers can be added to a curable composition and react with a curing agent to become incorporated into the cured polymer network. Antioxidant-containing prepolymers have antioxidants incorporated into the backbone of the prepolymer. Cured sealant compositions comprising reactive antioxidants and antioxidant-containing prepolymers exhibit enhanced thermal resistance.
    Type: Grant
    Filed: October 26, 2015
    Date of Patent: October 3, 2017
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Chandra Rao, Juexiao Cai, Renhe Lin
  • Sulfur-containing polyureas and methods of use
    Patent number: 9725556
    Abstract: Sulfur-containing polyurea compositions comprising a polyisocyanate and a polyamine are disclosed. The polyisocyanate comprises the reaction product of reactants comprising a diisocyanate having isocyanate groups with different reactivities toward thiol groups, and a thiol-terminated sulfur-containing polymer such as a thiol-terminated polythioether polymer and/or a thiol-terminated polyformal polymer. The polyamine can be an aromatic polyamine and/or an aromatic amine-terminated polythioether adduct. The sulfur-containing polyurea compositions are useful as aerospace sealants.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: August 8, 2017
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Juexiao Cai, Stephen J. Hobbs, Marfi Ito, Scott Moravek, Renhe Lin
  • Polythioether sealants with extended working time
    Patent number: 9683129
    Abstract: Thiol-terminated polythioether compositions and sealants prepared using the thiol-terminated polythioether compositions that exhibit extended working time and that rapidly cures at room temperature at the end of the working time are disclosed.
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: June 20, 2017
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Juexiao Cai, Renhe Lin
  • Energy curable sealants
    Patent number: 9650552
    Abstract: Curable compositions containing thiol-terminated polythioethers and encapsulated polyepoxy curing agents are disclosed. The compositions exhibit extended pot life.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: May 16, 2017
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Juexiao Cai, Renhe Lin
  • Maleimide-terminated sulfur-containing polymers, compositions thereof, and uses thereof
    Patent number: 9611359
    Abstract: Sulfur-containing polymer adducts such as polythioethers, polysulfides, and sulfur-containing polyformals having terminal maleimide groups, and in particular, sulfur-containing polymers and sulfur containing adducts having terminal 1,1?-(methylenedi-4,1-phenylene)bismaleimide groups are disclosed. The adducts provide cured sealants having improved tensile strength and elongation and are useful as aerospace sealants.
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: April 4, 2017
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Chandra Rao, Renhe Lin
  • Polyurea compositions and methods of use
    Patent number: 9580635
    Abstract: Disclosed are polyurea compositions comprising the reaction products of a polyformal-isocyanate prepolymer and a curing agent comprising an amine. The compositions are useful as sealants in aerospace applications.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: February 28, 2017
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Nagarajan Srivatsan, Alfredo Reyes, Sean Manion, Juexiao Cai, Marfi Ito, Renhe Lin
  • Amino alcohol treatment for sol-gel conversion coatings, substrates including the same, and methods of making the substrates
    Patent number: 9562000
    Abstract: An article includes a substrate, a sol-gel conversion coating on at least a portion of the substrate, and a treatment layer on at least a portion of the sol-gel conversion coating. The treatment layer includes an amino alcohol. A method of manufacturing the article includes applying a partially cured sol-gel composition to at least a portion of a substrate, at least partially drying the partially cured sol-gel composition to form the sol-gel conversion coating, applying a solution including an amino alcohol to at least a portion of the sol-gel conversion coating, and at least partially drying the solution including the amino alcohol.
    Type: Grant
    Filed: February 14, 2014
    Date of Patent: February 7, 2017
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Charles Keil, Richard Albers
  • Sulfone-containing polythioethers, compositions thereof, and methods of synthesis
    Patent number: 9540540
    Abstract: Sulfone-containing polythioethers, compositions containing sulfone-containing polythioethers, methods of synthesizing sulfone-containing polythioethers and the use of sulfone-containing polythioethers in aerospace sealant applications are disclosed. The sulfone-containing polythioethers have sulfone groups incorporated into the backbone of the polythioether. Cured sealant compositions comprising the sulfone-containing polythioethers exhibit enhanced thermal resistance.
    Type: Grant
    Filed: May 11, 2015
    Date of Patent: January 10, 2017
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Chandra Rao, Juexiao Cai, Renhe Lin
  • Uses of UV-curable polythioether sealants for sealing fasteners and for smoothing surfaces
    Patent number: 9533798
    Abstract: UV curable sealants, method s for making the sealants, and method for using the sealants are disclosed. The UV curable sealants may be used in seal caps useful to seal fasteners in aerospace fuel tanks. The UV curable sealants may also be used to smooth defects in surfaces such as aerospace surfaces.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: January 3, 2017
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Bruce Virnelson, Raquel Keledjian, Renhe Lin, Chandra B. Rao
  • Cure-on-demand moisture-curable urethane-containing fuel resistant prepolymers and compositions thereof
    Patent number: 9518197
    Abstract: Cure-on-demand, moisture-curable, urethane-containing prepolymers having urethanes incorporated into a sulfur-containing prepolymer backbone and compositions thereof for use in sealant applications are disclosed. The cure-on-demand moisture-curable urethane-containing prepolymers are terminated with polyalkoxysilyl groups. The compositions contain a controlled-release moisture cure catalyst. Compositions containing the prepolymers provide cured sealants exhibiting improved tensile strength.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: December 13, 2016
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Raquel Keledjian, Renhe Lin
  • Controlled release amine-catalyzed, Michael addition-curable sulfur-containing polymer compositions
    Patent number: 9499668
    Abstract: Compositions comprising sulfur-containing polymers such as polythioethers, Michael acceptors, and controlled release amine catalysts employing Michael addition curing chemistries useful in aerospace sealant applications are disclosed. The compositions exhibit extended pot life and the rate of curing can be tailored for specific applications.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: November 22, 2016
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Juexiao Cai, Lawrence G. Anderson, Renhe Lin
  • Conductive sealant compositions
    Patent number: 9484123
    Abstract: Embodiments of the present disclosure are directed to sealant compositions including a base composition with at least one sulfur-containing polymer, a curing agent composition, and an electrically conductive filler including carbon nanotubes and stainless steel fibers. The electrically conductive filler can be in either or both of the base composition and the curing agent composition. The sealant compositions are substantially Ni-free and exhibit unexpectedly superior EMI/RFI shielding effectiveness.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: November 1, 2016
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Ahmed Sharaby, Ponchivy Tan
  • Nut plate seal caps
    Patent number: 9447808
    Abstract: A cap (10) for sealing a mechanical fastener (200), method for making the cap, and driver and method for applying the cap is disclosed. The cap includes a shell having an exterior surface (14) and an interior surface (16) defining a cavity (18), an opening (19) extending through the shell between the interior and exterior surfaces, and a sealant (13) at least partially filling the cavity. A package and a holder for holding a plurality of cap assemblies are also disclosed.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: September 20, 2016
    Assignee: PRC-DeSoto International, Inc.
    Inventors: George C. Obuhowich, Soccorso Rizzello, Russell Shellenberger