Patents by Inventor Kuo-Shein Shen

Kuo-Shein Shen 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: 8011913
    Abstract: Provided in one aspect is a method of melt blending comprising providing an extruder possessing addition points from a zero point to a 100 point the length of the extruder; adding at least one thermoplastic and at least one curable polymer at the zero to 10 point of the extruder; adding at least one silicone hydride at the 5 to 30 point of the extruder; adding at least one metal catalyst at the 20 to 60 point of the extruder, with the proviso that the metal catalyst is added at least 5 points farther down the extruder than the silicone hydride. Provided in another aspect is a hydrosilylation curative composition comprising a silicone hydride having the formula wherein H is hydrogen, and each R? is independently selected from hydrogen and C1 to C10 alkyl groups; R? is selected from C1 to C10 alkyl groups; n is an integer from 5 to 45; and m is an integer from 5 to 45.
    Type: Grant
    Filed: February 29, 2008
    Date of Patent: September 6, 2011
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Tonson Abraham, Edward Blok, Kuo-Shein Shen, Norman Glenn Barber
  • Patent number: 7655728
    Abstract: The invention relates to a method of preparing a thermoplastic vulcanizate comprising: a) melt processing a blend of thermoplastic polymer and vulcanizable elastomer in a multi-screw extruder having at least three intermeshing screws, wherein said screws have 3-170 mixing zones, and said extruder having a L/D ratio of 15-100, and a screw profile that has 3 to 17 meshes per L/D; b) adding at least one curing agent to the melt-processed blend of a) in at least one location in the first 46% of the length of said extruder, or adding at least one curing agent to the melt-processed blend of a) in a second extruder, so as to initiate curing of the blend: and, curing at least partially said elastomer by reactive melt processing. Improved processing, reaction kinetics and efficiencies are achieved, as well as thermoplastic vulcanizate products having decreased weight gain when placed in mineral oils.
    Type: Grant
    Filed: June 27, 2005
    Date of Patent: February 2, 2010
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Hari P. Nadella, Jianya Cheng, Ronald DeYoung, Kuo-Shein Shen
  • Publication number: 20090221753
    Abstract: Provided in one aspect is a method of melt blending comprising providing an extruder possessing addition points from a zero point to a 100 point the length of the extruder; adding at least one thermoplastic and at least one curable polymer at the zero to 10 point of the extruder; adding at least one silicone hydride at the 5 to 30 point of the extruder; adding at least one metal catalyst at the 20 to 60 point of the extruder, with the proviso that the metal catalyst is added at least 5 points farther down the extruder than the silicone hydride. Provided in another aspect is a hydrosilylation curative composition comprising a silicone hydride having the formula wherein H is hydrogen, and each R? is independently selected from hydrogen and C1 to C10 alkyl groups; R? is selected from C1 to C10 alkyl groups; n is an integer from 5 to 45; and m is an integer from 5 to 45.
    Type: Application
    Filed: February 29, 2008
    Publication date: September 3, 2009
    Inventors: Tonson Abraham, Edward Blok, Kuo-Shein Shen, Norman Glenn Barber
  • Patent number: 7276559
    Abstract: This invention relates to a soft thermoplastic vulcanizate composition comprising: a) from about 2-10 wt %, based upon total polymer content weight a)+b)+c), of a thermoplastic polyethylene or polypropylene homopolymer, or ethylene-propylene copolymer, or copolymer that includes ethylene or propylene together with one or more C4 to C20 ?-olefins, said thermoplastic having at least 25% crystallinity by DSC; b) from about 15 to about 36 wt. %, based upon total polymer content weight a)+b)+c), of an ethylene-?-olefin random or block copolymer thermoplastic having less than 5% crystallinity by DSC; c) from about 60 to about 80 wt. %, based upon total polymer content weight a)+b)+c), of a cross-linked elastomer; and d) from about 50 to about 65 wt %, based upon total composition weight a)+b)+c)+d), of a process oil; wherein said thermoplastic vulcanizate composition has a Shore A Hardness of less than 35. The invention compositions may also comprise from about 0 to about 40 wt.
    Type: Grant
    Filed: December 15, 2004
    Date of Patent: October 2, 2007
    Assignee: Advanced Elastomer Systems, L.P.
    Inventors: Tonson Abraham, Kuo-Shein Shen, Norman G. Barber
  • Publication number: 20060293457
    Abstract: The invention relates to a method of preparing a thermoplastic vulcanizate comprising: a) melt processing a blend of thermoplastic polymer and vulcanizable elastomer in a multi-screw extruder having at least three intermeshing screws, wherein said screws have 3-170 mixing zones, and said extruder having a L/D ratio of 15-100, and a screw profile that has 3 to 17 meshes per L/D; b) adding at least one curing agent to the melt-processed blend of a) in at least one location in the first 46% of the length of said extruder, or adding at least one curing agent to the melt-processed blend of a) in a second extruder, so as to initiate curing of the blend: and, curing at least partially said elastomer by reactive melt processing. Improved processing, reaction kinetics and efficiencies are achieved, as well as thermoplastic vulcanizate products having decreased weight gain when placed in mineral oils.
    Type: Application
    Filed: June 27, 2005
    Publication date: December 28, 2006
    Inventors: Hari Nadella, Jianya Cheng, Ronald DeYoung, Kuo-Shein Shen
  • Publication number: 20050277735
    Abstract: This invention relates to a soft thermoplastic vulcanizate composition comprising: a) from about 2-10 wt %, based upon total polymer content weight a)+b)+c), of a thermoplastic polyethylene or polypropylene homopolymer, or ethylene-propylene copolymer, or copolymer that includes ethylene or propylene together with one or more C4 to C20 ?-olefins, said thermoplastic having at least 25% crystallinity by DSC; b) from about 15 to about 36 wt. %, based upon total polymer content weight a)+b)+c), of an ethylene-?-olefin random or block copolymer thermoplastic having less than 5% crystallinity by DSC; c) from about 60 to about 80 wt. %, based upon total polymer content weight a)+b)+c), of a cross-linked elastomer; and d) from about 50 to about 65 wt %, based upon total composition weight a)+b)+c)+d), of a process oil; wherein said thermoplastic vulcanizate composition has a Shore A Hardness of less than 35. The invention compositions may also comprise from about 0 to about 40 wt.
    Type: Application
    Filed: December 15, 2004
    Publication date: December 15, 2005
    Inventors: Tonson Abraham, Kuo-Shein Shen, Norman Barber
  • Patent number: 6251998
    Abstract: In the preparation of thermoplastic elastomers by hydrosilylation crosslinking of the elastomeric component, the use of an elastomer containing a non-conjugated diene and having a Mooney viscosity within the MST range of 45 to 100 provides products with a high level of crosslinking and an improved combination of physical properties. This improvement is obtained even at low concentrations of hydrosilylation catalyst.
    Type: Grant
    Filed: October 29, 1999
    Date of Patent: June 26, 2001
    Assignees: Advanced Elastomer Systems, L.P., Exxon Chemical Patents, Inc.
    Inventors: Robert E. Medsker, Donald R. Hazelton, Gary W. Gilbertson, Sabet Abdou-Sabet, Kuo-Shein Shen, Ronald L. Hazelton, Periagaram S. Ravishankar
  • Patent number: 6150464
    Abstract: An improved process for the preparation of thermoplastic elastomers by hydrosilylation crosslinking, in which a hydrosilylation crosslinking agent with a low degree of polymerization and/or a hydrosilylation crosslinking agent diluted in oil is used.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: November 21, 2000
    Assignee: Advanced Elastomer Systems, L.P.
    Inventors: Robert E. Medsker, Jianqun Zhao, Gary W. Gilbertson, Kuo-Shein Shen, Donald Wang
  • Patent number: 5936039
    Abstract: Processes for the preparation of a thermoplastic elastomer comprising a triblend of engineering resin, dynamically vulcanized alloy of thermoplastic olefin polymer and elastomeric copolymer, and a compatibilizer for the engineering resin and alloy. The compatibilizer can be formed in a separate step or in-situ in a one step process. The processes produce compositions which retain structural integrity at high temperature, and have good tensile properties, elongation and fluid resistance.
    Type: Grant
    Filed: November 10, 1997
    Date of Patent: August 10, 1999
    Inventors: Kang-Bo Wang, Kuo-Shein Shen, Krishna Venkataswamy, Craig A. Chmielewski
  • Patent number: 4594390
    Abstract: A process is described for the preparation of thermoplastic elastomers comprising a blend of plastic and cured rubber by dynamic vulcanization wherein the blend is subjected to high shear.
    Type: Grant
    Filed: August 23, 1982
    Date of Patent: June 10, 1986
    Assignee: Monsanto Company
    Inventors: Sabet Abdou-Sabet, Kuo-Shein Shen