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
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.
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.
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
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.
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
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.
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
Abstract: Low-density compositions and sealants prepared from sulfur-containing prepolymer compositions that exhibit enhanced fuel resistance are disclosed. The low density and enhanced fuel resistance is realized by using polyphenylene sulfide fillers.
Abstract: Disclosed are flexible polyamines, flexible amine-terminated polyformal adducts, flexible-amine-terminated polythioether adducts, compositions comprising flexible polyamines and isocyanate-terminated prepolymers, and compositions comprising flexible amine-terminated adducts and isocyanate-terminated prepolymers. Uses of the compositions as sealants, and particularly as aerospace sealants, are also disclosed.
Type:
Grant
Filed:
June 18, 2014
Date of Patent:
August 23, 2016
Assignee:
PRC-DeSoto International, Inc.
Inventors:
Stephen J. Hobbs, Marfi Ito, Juexiao Cai, Chandra Rao, Renhe Lin
Abstract: Compositions useful in aerospace sealant applications comprise sulfur-containing polymers such as polythioethers and polysulfides and are cured using Michael addition reactions. Compositions employing Michael addition curing chemistries include sulfur-containing adducts comprising terminal Michael acceptor groups. In particular, the sulfur-containing adducts include terminal 1-(ethylenesulfonyl)-n-(vinylsulfonyl)alkanol groups.
Type:
Grant
Filed:
May 11, 2015
Date of Patent:
July 19, 2016
Assignee:
PRC-DeSoto International, Inc.
Inventors:
Juexiao Cai, Lawrence G. Anderson, Marfi Ito, Renhe Lin
Abstract: The use of Michael addition curing chemistries in compositions comprising sulfur-containing polymers such as polythioethers and polysulfides useful in aerospace sealant applications are disclosed. Sulfur-containing adducts comprising terminal Michael acceptor groups are also disclosed.
Type:
Grant
Filed:
August 19, 2014
Date of Patent:
July 12, 2016
Assignee:
PRC-Desoto International, Inc.
Inventors:
Lawrence G. Anderson, Juexiao Cai, Marfi Ito, Raquel Keledjian, Renhe Lin
Abstract: Metal ligand-containing prepolymers, compositions containing metal ligand-containing prepolymers, methods of synthesizing metal ligand-containing prepolymers and the use of metal ligand-containing prepolymers in aerospace sealant applications are disclosed. The metal ligand-containing prepolymers have metal ligands incorporated into the backbone of the prepolymer. Cured sealant compositions comprising the metal ligand-containing prepolymers exhibit enhanced properties suitable for aerospace sealant applications.
Abstract: Disclosed are multifunctional sulfur-containing polymers that are the reaction products of a sulfur-containing diol, a polyol containing at least three hydroxyl groups per polyol molecule, and an aldehyde, a ketone, or a combination thereof. Sealant compositions comprising the multifunctional sulfur-containing polymers are also disclosed.
Type:
Grant
Filed:
January 5, 2016
Date of Patent:
July 5, 2016
Assignee:
PRC-DeSoto International, Inc.
Inventors:
Steven J. Hobbs, Gregory J. McCollum, Juexiao Cai, Marfi Ito, Lawrence G. Anderson, Renhe Lin
Abstract: Thiol-terminated polythioether compositions and sealants prepared using the thiol-terminated polythioether compositions that exhibit enhanced retention of elongation following exposure to high temperature are disclosed. The enhanced retention of elongation is realized by incorporating certain phenolic antioxidants into the composition.
Type:
Grant
Filed:
August 29, 2014
Date of Patent:
July 5, 2016
Assignee:
PRC-DeSoto International, Inc.
Inventors:
Juexiao Cai, Emilia Serrano, Bruce Virnelson, Renhe Lin
Abstract: The use of Michael addition curing chemistries in compositions comprising sulfur-containing polymers such as polythioethers and polysulfides useful in aerospace sealant applications are disclosed. Sulfur-containing adducts comprising terminal Michael acceptor groups are also disclosed.
Type:
Grant
Filed:
August 19, 2014
Date of Patent:
June 14, 2016
Assignee:
PRC-DeSoto International, Inc.
Inventors:
Lawrence G. Anderson, Juexiao Cai, Marfi Ito, Raquel Keledjian, Renhe Lin
Abstract: A composition for application to a metal substrate comprising at least one metallate compound comprising hexafluorzirconate, zirconyl nitrate, and/or yttrium nitrate is provided. The composition may further comprise additives that promote corrosion resistance of the metal substrate, or the adhesion of subsequent coatings, such as one or more rare earth element salts; allontoin, polyvinylpyrrolidone, surfactants, and other additives and co-inhibitors. A metal substrate such as an aluminum or an aluminum alloy substrate coated with a metallate composition according to the present invention is also provided. A process for preparing a coating on a metal substrate to improve the corrosion resistance of the substrate or improve the adhesion of a subsequent coating is also provided. The process comprises treating the metal substrate with an aqueous solution comprising a metallate compound.
Abstract: Moisture-curable, urethane-containing prepolymers containing urethanes incorporated into the prepolymer backbone and compositions thereof for use in sealant applications are disclosed. The prepolymers can be prepared by reacting an isocyanate-terminated urethane-containing adduct with a compound comprising a group reactive with an isocyanate group and at least one polyalkoxysilyl group. Compositions containing a moisture-curable, urethane-containing prepolymer and a moisture cure catalyst can be used to provide cured compositions exhibiting improved tensile strength. Compositions containing the prepolymers are useful in aerospace sealant applications.
Abstract: Urethane-containing prepolymers formed from diisocyanates and adapted for Michael addition curing chemistries and compositions thereof for use in sealant applications are disclosed. The prepolymers provide compositions that exhibit room temperature stability and a controlled curing rate following a brief activation.