Patents Assigned to PRC
  • Publication number: 20190010370
    Abstract: Compositions that are resistant to hydraulic fluid and aviation fuel contain sulfur-containing prepolymers and solvent-resistant organic fillers. The compositions are useful in aerospace sealant applications.
    Type: Application
    Filed: July 7, 2017
    Publication date: January 10, 2019
    Applicant: PRC-DeSoto International, Inc.
    Inventors: Renhe Lin, Weibin Cui
  • Patent number: 10072176
    Abstract: Primer coating compositions include a thiol-terminated urethane-containing polyether prepolymer, a polyepoxide, calcium carbonate, and magnesium oxide. The coating compositions are useful as corrosion resistant primers in aerospace applications.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: September 11, 2018
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Siamanto Abrami, Elizabeth J. Paclibar
  • Patent number: 10053596
    Abstract: The present invention is directed to a curable film-forming composition comprising: (a) a curing agent comprising reactive isocyanate functional groups; (b) a film-forming compound comprising functional groups reactive with the reactive isocyanate functional groups in (a); (c) a photo-latent catalyst; (d) a beta-diketone having a flash point higher than 60° C. (140° F.); and (e) a beta-diketone having a flash point lower than or equal to 60° C. (140° F.). The invention is further directed to methods of controlling the rate of cure and increasing the wet-edge time of a curable film-forming composition comprising an isocyanate functional curing agent, by adding to the curable film-forming composition a catalyst component comprising: (i) a photo-latent catalyst; (ii) a beta-diketone having a flash point higher than 60° C. (140° F.); and (iii) a beta-diketone having a flash point lower than or equal to 60° C. (140° F.).
    Type: Grant
    Filed: August 30, 2016
    Date of Patent: August 21, 2018
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Guangliang Tang, Mikhail Khudiakov
  • Patent number: 10053606
    Abstract: Compositions comprising thiol-terminated polythioether prepolymers, polyepoxides and non-chromate corrosion inhibitors suitable for use in aerospace sealant applications are disclosed. Sealants prepared using the compositions adhere to a variety of aerospace substrates following exposure to aerospace fluids.
    Type: Grant
    Filed: October 26, 2015
    Date of Patent: August 21, 2018
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Bruce Virnelson, Adam Stott, Sean Manion, Brian Bertino, Nagarajan Srivatsan
  • Patent number: 10047259
    Abstract: Disclosed are methods for making a cured sealant. The methods include depositing an uncured sealant composition on a substrate and exposing the uncured sealant composition to actinic radiation to provide a cured sealant. The uncured sealant composition includes a thiol-terminated polythioether, a polyene comprising a polyvinyl ether and/or a polyallyl compound, and a hydroxy-functional vinyl ether. Related sealant compositions are also disclosed.
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: August 14, 2018
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Raquel Keledjian, Renhe Lin, Chandra Rao, Bruce Virnelson
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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