Patents Assigned to PRC
  • Perfluoroether sealant compositions
    Patent number: 8962782
    Abstract: Disclosed are perfluoroethers and perfluoroether compositions useful in high temperature aerospace applications. The perfluoroethers can be adapted for use with various curing chemistries.
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: February 24, 2015
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Chandra Rao, Juexiao Cai, Renhe Lin
  • Bis(sulfonyl)alkanol-containing polythioethers, methods of synthesis, and compositions thereof
    Patent number: 8952124
    Abstract: Bis(sulfonyl)alkanol-containing polythioethers, compositions containing bis(sulfonyl)alkanol-containing polythioethers, methods of synthesizing bis(sulfonyl)alkanol-containing polythioethers and the use of bis(sulfonyl)alkanol-containing polythioethers in aerospace sealant applications are disclosed. The bis(sulfonyl)alkanol-containing polythioethers have bis(sulfonyl)alkanol groups incorporated into the backbone of the polythioether. Cured sealant compositions comprising the bis(sulfonyl)alkanol-containing polythioethers exhibit enhanced properties suitable for aerospace sealant applications.
    Type: Grant
    Filed: June 21, 2013
    Date of Patent: February 10, 2015
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Chandra Rao, Juexiao Cai, Renhe Lin
  • Moisture-curable, amine-catalyzed sulfur-containing polymer compositions
    Patent number: 8952110
    Abstract: Disclosed are moisture-curable, amine-catalyzed compositions containing sulfur-containing polymers and blocked basic catalysts having extended pot life. The use of the moisture-curable, amine-catalyzed compositions in aerospace sealant applications is also disclosed.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: February 10, 2015
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Juexiao Cai, Renhe Lin
  • Methods for making cured sealants by actinic radiation and related compositions
    Patent number: 8932685
    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 and a polyene comprising a polyvinyl ether and/or a polyallyl compound. Related sealant compositions are also disclosed.
    Type: Grant
    Filed: August 13, 2010
    Date of Patent: January 13, 2015
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Raquel Keledjian, Renhe Lin, Chandra Rao, Bruce Virnelson
  • Polythioethers, moisture curable compositions and methods for their manufacture and use
    Patent number: 8901256
    Abstract: One-part moisture curable sealant compositions and methods of making the same are provided. The compositions include a silyl-functional polythioether and a polyepoxide. Methods of making sealant compositions are also provided.
    Type: Grant
    Filed: January 12, 2012
    Date of Patent: December 2, 2014
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Carissa Pajel, Alfredo M. Reyes, Jr., Raquel A. Keledjian, Gordon Zabrecky
  • Terminal-modified difunctional sulfur-containing polymers, compositions thereof and methods of use
    Patent number: 8889800
    Abstract: Disclosed are terminal-modified difunctional sulfur-containing polymers that are the reaction products of a sulfur-containing diol, an aldehyde or a ketone, and a compound containing a functional group. Compositions comprising the terminal-modified difunctional sulfur-containing polymers useful as sealants are also disclosed.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: November 18, 2014
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Steven J. Hobbs, Gregory J. McCollum, Lawrence G. Anderson, Renhe Lin
  • Multifunctional sulfur-containing polymers, compositions thereof and methods of use
    Patent number: 8877887
    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: February 11, 2014
    Date of Patent: November 4, 2014
    Assignee: PRC De Soto International, Inc.
    Inventors: Steven J. Hobbs, Gregory J. McCollum, Juexiao Cai, Marfi Ito, Lawrence G. Anderson, Renhe Lin
  • Michael addition curing chemistries for sulfur-containing polymer compositions
    Patent number: 8871896
    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: June 21, 2012
    Date of Patent: October 28, 2014
    Assignee: PRC DeSoto International, Inc.
    Inventors: Lawrence G. Anderson, Juexiao Cai, Marfi Ito, Raquel Keledjian, Renhe Lin
  • Perfluoroether sealant compositions
    Patent number: 8864930
    Abstract: Disclosed are perfluoroethers and perfluoroether compositions useful in high temperature aerospace applications. The perfluoroethers can be adapted for use with various curing chemistries.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: October 21, 2014
    Assignee: PRC De Soto International, Inc.
    Inventors: Chandra Rao, Juexiao Cai, Renhe Lin
  • METAL LIGAND-CONTAINING PREPOLYMERS, METHODS OF SYNTHESIS, AND COMPOSITIONS THEREOF
    Publication number: 20140275474
    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.
    Type: Application
    Filed: October 29, 2013
    Publication date: September 18, 2014
    Applicant: PRC-DeSoto International, Inc.
    Inventors: Chandra Rao, Jun Deng, Renhe Lin
  • SULFONE-CONTAINING POLYTHIOETHERS, COMPOSITIONS THEREOF, AND METHODS OF SYNTHESIS
    Publication number: 20140275461
    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: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: PRC-DeSoto International, Inc.
    Inventors: Chandra Rao, Juexiao Cai, Renhe Lin
  • STRIPPABLE FILM ASSEMBLY AND COATING FOR DRAG REDUCTION
    Publication number: 20140272237
    Abstract: An assembly includes a substrate, a film on the substrate, and a coating on the film. The film includes a material permeable to organic solvents, and the coating includes a material reactive with the film. Alternatively, the assembly may include a substrate including a textured region, and a coating on the textured region. The coating mimics the texture of the textured. In an alternative embodiment, a laminate includes a film including a material permeable to organic solvents, a coating on the film, and an adhesive on a second surface of the film. The coating includes a material reactive with the film. In another embodiment, a method for reducing drag on a substrate includes applying a film on a substrate, and applying a coating on the film. The film includes a material permeable to organic solvents, and the coating includes a material reactive with the film.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: PRC-DeSoto International, Inc.
    Inventors: Todd M. Roper, Mark P. Bowman, Edward F. Rakiewicz
  • ENERGY CURABLE SEALANTS
    Publication number: 20140272287
    Abstract: Curable compositions containing thiol-terminated polythioethers and encapsulated polyepoxy curing agents are disclosed. The compositions exhibit extended pot life.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: PRC-DESOTO INTERNATIONAL INCORPORATED
    Inventor: PRC-DESOTO INTERNATIONAL INCORPORATED
  • METHOD TO STRUCTURE MINERAL AGGREGATE GRADATION BY USING THREE CONTROL POINTS AND TWO CURVES
    Publication number: 20140257742
    Abstract: The invention involves “a method to structure mineral aggregate gradation by using three control points & two curves”, including the following steps: (1) Three control points are determined according to the property of the mixtures: nominal maximum size of aggregate and its passing rate, nominal minimum size of aggregate and its passing rate, and the discontinuity point between the coarse aggregate and the fine aggregate and its passing rate. (2) The grading curves of the coarse and the fine aggregate are selected respectively with Power function model, Exponential function model and Logarithmic function model. (3) Measure the stamped density and the stamped voids in mineral aggregate, and then choose the grading of the coarse and the fine aggregate on the basis of the project need. The invention can help constitute different gradation curves in line with local materials from different areas and sources.
    Type: Application
    Filed: October 15, 2012
    Publication date: September 11, 2014
    Applicants: RESEARCH INSTITUTE OF HIGHWAY, MOT, PRC, GUANGXI COMMUNICATIONS INVESTMENT GROUP CO., LTD.
    Inventors: Xudong Wang, Qin Fu, Lei Zhang, Yi Liu, Xingye Zhou, Fujian Li
  • Flexible polyamines, flexible amine-terminated adducts, compositions thereof and methods of use
    Patent number: 8816044
    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: September 21, 2011
    Date of Patent: August 26, 2014
    Assignee: PRC DeSoto International, Inc
    Inventors: Stephen J. Hobbs, Marfi Ito, Juexiao Cai, Chandra Rao, Renhe Lin
  • Polyurea compositions and methods of use
    Patent number: 8802790
    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: February 20, 2014
    Date of Patent: August 12, 2014
    Assignee: PRC-DeSoto International, Inc.
    Inventors: Steven J. Hobbs, Juexiao Cai, Marfi Ito, Renhe Lin
  • COMPOSITIONS COMPRISING THIOL-TERMINATED POLYMERS AND SULFUR-CONTAINING ETHYLENICALLY UNSATURATED SILANES AND RELATED CURED SEALANTS
    Publication number: 20140186543
    Abstract: Disclosed are compositions that include: a) a thiol-terminated polymer; and b) a sulfur-containing ethylenically unsaturated silane. Related products, such as sealants, that include polymers derived from such compositions, are also disclosed.
    Type: Application
    Filed: March 7, 2014
    Publication date: July 3, 2014
    Applicant: PRC-DeSoto International, Inc.
    Inventors: Raquel Keledjian, Renhe Lin, Chandra Rao, Bruce Virnelson
  • Terminal-modified difunctional sulfur-containing polymers, compositions thereof and methods of use
    Patent number: 8765880
    Abstract: Disclosed are terminal-modified difunctional sulfur-containing polymers that are the reaction products of a sulfur-containing diol, an aldehyde or a ketone, and a compound containing a functional group. Compositions comprising the terminal-modified difunctional sulfur-containing polymers useful as sealants are also disclosed.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: July 1, 2014
    Assignee: PRC DeSoto International, Inc.
    Inventors: Stephen J. Hobbs, Gregory J. McCollum, Lawrence G. Anderson, Renhe Lin
  • Coating compositions with an isocyanate-functional prepolymer derived from a tricyclodecane polyol, methods for their use, and related coated substrates
    Patent number: 8758862
    Abstract: Coating compositions include (a) an isocyanate functional prepolymer derived from a polyisocyanate and a tricyclodecane-containing polyester polyol; and (b) a blocked amine curing agent.
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: June 24, 2014
    Assignee: PRC DeSoto International, Inc.
    Inventors: Siamanto Abrami, Guangliang Tang
  • Polyurea compositions and methods of use
    Patent number: 8729193
    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: July 3, 2013
    Date of Patent: May 20, 2014
    Assignee: PRC DeSoto International, Inc.
    Inventors: Stephen J. Hobbs, Juexiao Cai, Marfi Ito, Renhe Lin