Patents by Inventor Yunwa W. Cheung

Yunwa W. Cheung 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).

  • Publication number: 20080234435
    Abstract: This invention relates to polyolefin compositions. In particular, the invention pertains to elastic polymer compositions that can be more easily processed on cast film lines, extrusion lamination or coating lines due to improved resistance to draw resonance. The compositions of the present invention preferably comprise an elastomeric polyolefin resin and a high pressure low density type resin.
    Type: Application
    Filed: February 15, 2008
    Publication date: September 25, 2008
    Applicant: Dow Global Technologies Inc
    Inventors: Andy C. Chang, Ronald J. Weeks, Hong Peng, Antonios K. Doufas, Yunwa W. Cheung
  • Publication number: 20080177242
    Abstract: This invention relates to polyolefin compositions. In particular, the invention pertains to elastic polymer compositions that can be more easily processed on cast film lines, extrusion lamination or coating lines. The compositions of the present invention preferably comprise an elastomeric polyolefin resin and a high pressure low density type resin.
    Type: Application
    Filed: January 14, 2008
    Publication date: July 24, 2008
    Applicant: Dow Global Technologies Inc.
    Inventors: Andy C. Chang, Stephen M. Hoenig, Yunwa W. Cheung, Daniel G. Moldovan, Wenbin Liang, Charles F. Diehl
  • Patent number: 7355089
    Abstract: This invention relates to polyolefin compositions. In particular, the invention pertains to elastic polymer compositions that can be more easily processed on cast film lines, extrusion lamination or coating lines due to improved resistance to draw resonance. The compositions of the present invention preferably comprise an elastomeric polyolefin resin and a high pressure low density type resin.
    Type: Grant
    Filed: March 15, 2006
    Date of Patent: April 8, 2008
    Assignee: Dow Global Technologies Inc.
    Inventors: Andy C. Chang, Ronald J. Weeks, Hong Peng, Antonios K. Doufas, Yunwa W. Cheung
  • Patent number: 7302991
    Abstract: A fugitive pattern for making a shell mold for investment casting a metal or alloy comprises a substantially random interpolymer and a low molecular weight polymer in proportions to provide a fugitive pattern having a combination of properties suitable for use in making the shell molds.
    Type: Grant
    Filed: October 27, 2005
    Date of Patent: December 4, 2007
    Assignees: Howmet Research Corporation, Dow Global Technologies, Inc.
    Inventors: Dane Chang, Yunwa W. Cheung, Charles F. Diehl, Joseph M. Vihtelic
  • Patent number: 7302992
    Abstract: A fugitive pattern for making a shell mold for investment casting a metal or alloy comprises a substantially random interpolymer and a low molecular weight polymer in proportions to provide a fugitive pattern having a combination of properties suitable for use in making the shell molds.
    Type: Grant
    Filed: October 27, 2005
    Date of Patent: December 4, 2007
    Assignees: Howmet Research Corporation, Dow Global Technologies, Inc
    Inventors: Dane Chang, Yunwa W. Cheung, Charles F. Diehl, Joseph M. Vihtelic
  • Patent number: 7264036
    Abstract: A fugitive pattern for making a shell mold for investment casting a metal or alloy comprises a substantially random interpolymer and a low molecular weight polymer in proportions to provide a fugitive pattern having a combination of properties suitable for use in making the shell molds.
    Type: Grant
    Filed: October 27, 2005
    Date of Patent: September 4, 2007
    Assignee: Howmet Corporation
    Inventors: Dane Chang, Yunwa W. Cheung, Charles F. Diehl, Joseph M. Vihtelic
  • Patent number: 7259219
    Abstract: An article of manufacture comprises a copolymer of ethylene and vinyl aromatic monomer having a molecular weight of less than 15,000. Preferably, the copolymer is characterized by a backbone having a first and second terminal end group, the first terminal end group is a methyl group, the second terminal end group is a vinyl group, wherein the ratio of the terminal methyl group to the terminal vinyl group is 0.8:1 to 1:0.8. The article of manufacture includes, but is not limited to, waxes, lubricants, additives, etc. The waxes may be used to formulate paints and coatings, printing inks, carbon paper, photo toners, building and construction materials, mold release agents, hot melt adhesives, candles. The waxes may also be used in wood processing, metal working, powder metallurgy and sintering, wax modeling, sizing, crop protection, and so on.
    Type: Grant
    Filed: April 9, 2003
    Date of Patent: August 21, 2007
    Assignee: Dow Global Technologies Inc.
    Inventors: Robert K. Rosen, Teresa P. Karjala, Selim Yalvac, Yunwa W. Cheung, Martin J. Guest, Brian W. S. Kolthammer, Steven M. Ueligger
  • Publication number: 20060199744
    Abstract: A lubricant composition comprises an ethylene/?-olefin interpolymer having a number average molecular weight of less than 10,000 g/mol as a base oil and at least one oil additive. The ethylene/?-olefin interpolymer has at least one molecular fraction which elutes between 40° C. and 130° C. when fractionated using TREF, characterized in that the fraction has a molar comonomer content of at least 5 percent higher than that of a comparable random ethylene interpolymer fraction eluting between the same temperatures, wherein said comparable random ethylene interpolymer has the same comonomer(s) and has a melt index, density, and molar comonomer content (based on the whole polymer) within 10 percent of that of the ethylene/?-olefin interpolymer.
    Type: Application
    Filed: March 15, 2006
    Publication date: September 7, 2006
    Applicant: Dow Global Technologies Inc.
    Inventors: Kim L. Walton, Morgan M. Hughes, Gary Rath, Yunwa W. Cheung
  • Patent number: 6946520
    Abstract: This invention relates to fabricated articles, including films or sheets prepared from blends of substantially random ethylene/propylene/vinyl aromatic monomer interpolymers with propylene homopolymers or copolymers. The fabricated articles exhibit high toughness, tensile properties and heat resistance and low stress whitening, and further can exhibit desirable optical properties, especially when in the form of a film or sheet.
    Type: Grant
    Filed: February 27, 2002
    Date of Patent: September 20, 2005
    Assignee: Dow Global Technologies, Inc.
    Inventors: Seema V. Karande, Martin J. Guest, Satoru Moriya, Yunwa W. Cheung, Bharat I. Chaudhary, Shuichi Murakami
  • Patent number: 6844399
    Abstract: Sulfonated substantially random interpolymers made from monomer components comprise from 1 to 65 mole percent of (a) at least one vinyl or vinylidene aromatic monomer, or (b) at least one hindered aliphatic or cycloaliphatic vinylidene monomer, or (c) a combination of at least one vinyl or vinylidene aromatic monomer and at lest one hindered aliphatic or cycloaliphatic vinylidene monomer, and from 35 to 99 mole percent of at least one aliphatic ?-olefin having from 2 to 20 carbon atoms; and optionally, from 0 to 20 mole percent of a diene containing from 4 to 20 carbon atoms; wherein the sulfonated interpolymer contains at least one mer (or moiety) of a group represented by the formula —SO3?M where M is hydrogen or a group 1, 7 or 12 metal in ionic form or combination thereof. Blends of these polymers with polyamides and polyolefins are made.
    Type: Grant
    Filed: October 7, 2002
    Date of Patent: January 18, 2005
    Assignee: Dow Global Technologies, Inc.
    Inventors: Yunwa W. Cheung, Stephen F. Hahn, James C. Stevens, Francis J. Timmers, Gregory F. Schmidt, Thoi H. Ho, Robert H. Terbrueggen
  • Publication number: 20040167270
    Abstract: A fugitive pattern for making a shell mold for investment casting a metal or alloy comprises a substantially random interpolymer and a low molecular weight polymer in proportions to provide a fugitive pattern having a combination of properties suitable for use in making the shell molds.
    Type: Application
    Filed: February 25, 2003
    Publication date: August 26, 2004
    Inventors: Dane Chang, Yunwa W. Cheung, Charles F. Diehl, Joseph M. Vihtelic
  • Publication number: 20030149189
    Abstract: Sulfonated substantially random interpolymers made from monomer components comprise from 1 to 65 mole percent of (a) at least one vinyl or vinylidene aromatic monomer, or (b) at least one hindered aliphatic or cycloaliphatic vinylidene monomer, or (c) a combination of at least one vinyl or vinylidene aromatic monomer and at lest one hindered aliphatic or cycloaliphatic vinylidene monomer, and from 35 to 99 mole percent of at least one aliphatic &agr;-olefin having from 2 to 20 carbon atoms; and optionally, from 0 to 20 mole percent of a diene containing from 4 to 20 carbon atoms; wherein the sulfonated interpolymer contains at least one mer (or moiety) of a group represented by the formula —SO3−M where M is hydrogen or a group 1, 7 or 12 metal in ionic form or combination thereof. Blends of these polymers with polyamides and polyolefins are made.
    Type: Application
    Filed: October 7, 2002
    Publication date: August 7, 2003
    Applicant: Dow Global Technologies Inc.
    Inventors: Yunwa W. Cheung, Stephen F. Hahn, James C. Stevens, Francis J. Timmers, Gregory F. Schmidt, Thoi H. Ho, Robert H. Terbrueggn
  • Publication number: 20030120012
    Abstract: A process for making an interpolymer product that includes contacting at least one &agr;-olefinic monomer and at least one vinyl or vinylidene monomer in the presence of at least a first single site catalyst and second single site catalyst in a reactor system, and effectuating the polymerization of the monomers in the reactor.
    Type: Application
    Filed: December 23, 2002
    Publication date: June 26, 2003
    Applicant: The Dow Chemical Company
    Inventors: Yunwa W. Cheung, Martin J. Guest, Robert K. Rosen, Brian W. Kolthammer
  • Patent number: 6552148
    Abstract: The present invention relates to a thermoplastic interpolymer product comprising an &agr;-olefin interpolymerized with at least one vinyl or vinylidene aromatic monomer and/or at least one hindered aliphatic or cycloaliphatic vinyl or vinylidene aromatic monomer and, in at least one aspect, is characterized as having substantially synergistic thermal properties. The invention also relates to a process for manufacturing the interpolymer product wherein the process employs two or more single site or metallocene catalyst systems in at least one reaction environment and wherein at least two of the catalyst systems have (a) different monomer incorporation capabilities or reactivities and (b) the same or, optionally, different monomer sequencing and/or tacticity characteristics.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: April 22, 2003
    Assignee: The Dow Chemical Company
    Inventors: Yunwa W. Cheung, Martin J. Guest, Robert K. Rosen, Brian W. Kolthammer
  • Patent number: 6512049
    Abstract: Sulfonated substantially random interpolymers made from monomer components comprise from 1 to 65 mole percent of (a) at least one vinyl or vinylidene aromatic monomer, or (b) at least one hindered aliphatic or cycloaliphatic vinylidene monomer, or (c) a combination of at least one vinyl or vinylidene aromatic monomer and at lest one hindered aliphatic or cycloaliphatic vinylidene monomer, and from 35 to 99 mole percent of at least one aliphatic &agr;-olefin having from 2 to 20 carbon atoms; and optionally, from 0 to 20 mole percent of a diene containing from 4 to 20 carbon atoms; wherein the sulfonated interpolymer contains at least one mer (or moiety) of a group represented by the formula —SO3M where M is hydrogen or a group 1, 7 or 12 metal in ionic form or combination thereof. Blends of these polymers with polyamides and polyolefins are made.
    Type: Grant
    Filed: May 8, 2002
    Date of Patent: January 28, 2003
    Assignee: Dow Global Technologies Inc.
    Inventors: Yunwa W. Cheung, Stephen F. Hahn, James C. Stevens, Francis J. Timmers, Gregory F. Schmidt, Robert H. Terbrueggen, Thoi H. Ho
  • Patent number: 6479594
    Abstract: Sulfonated substantially random interpolymers made from monomer components comprise from 1 to 65 mole percent of (a) at least one vinyl or vinylidene aromatic monomer, or (b) at least one hindered aliphatic or cycloaliphatic vinylidene monomer, or (c) a combination of at least one vinyl or vinylidene aromatic monomer and at least one hindered aliphatic or cycloaliphatic vinylidene monomer, and from 35 to 99 mole percent of at least one aliphatic &agr;-olefin having from 2 to 20 carbon atoms; and optionally, from 0 to 20 mole percent of a diene containing from 4 to 20 carbon atoms; wherein the sulfonated interpolymer contains at least one mer (or moiety) of a group represented by the formula —SO3−M where M is hydrogen or a group 1, 7 or 12 metal in ionic form or combination thereof. Blends of these polymers with polyamides and polyolefins are made.
    Type: Grant
    Filed: April 20, 2000
    Date of Patent: November 12, 2002
    Assignee: The Dow Chemical Company
    Inventors: Yunwa W. Cheung, Stephen F. Hahn, James C. Stevens, Francis J. Timmers, Gregory F. Schmidt, Thoi H. Ho, Robert H. Terbrueggen
  • Publication number: 20020136916
    Abstract: The present invention pertains to elastic films having at least one layer comprising a substantially random interpolymer or a blend thereof. The interpolymer comprises polymer units derived from at least C2-20 &agr;-olefin and (i) at least one vinyl aromatic monomer, or (ii) at least one aliphatic or cycloaliphatic vinyl or vinylidene monomer, or (iii) a combination of at least one aromatic vinyl monomer and at least one aliphatic or cycloaliphatic vinyl or vinylidene monomer. The interpolymer may also comprise one or more ethylenically unsaturated polymerizable monomers other than those previously mentioned. The elastic films have a recovery in the cross direction of greater than or equal to about 80% and has a recovery in the machine direction of greater than or equal to about 60%.
    Type: Application
    Filed: January 25, 2002
    Publication date: September 26, 2002
    Inventors: Yunwa W. Cheung, Martin J. Guest, William R. Van Volkenburgh
  • Publication number: 20020107315
    Abstract: The compositions of the present invention comprise at least one substantially random interpolymer (or blends with other thermoplastics), one or more flame retardant compounds and, optionally one or more flame-retardant synergists. For levels of flame retardants which yield a halogen content of about 0.05 to about 50 parts-per-hundred resin (phr), depending on whether the structure is foamed or not, which in turn result in LOI levels greater than or equal to about 23% oxygen, the compositions of the present invention unexpectedly still retain desirable mechanical properties such as compressive strength, toughness, and elasticity.
    Type: Application
    Filed: December 1, 2000
    Publication date: August 8, 2002
    Inventors: Bharat I. Chaudhary, Russell P. Barry, Yunwa W. Cheung, Thoi H. Ho, Martin J. Guest, William G. Stobby
  • Patent number: 6388014
    Abstract: A latex or fiber comprising a blend of polymeric materials consisting of one or more &agr;-olefin/ vinylidene monomer non-crosslinked substantially random interpolymers, wherein the distribution of the monomers of said interpolymers can be described by the Bernoulli statistical model or by a first or second order Markovian statistical model, and one or more homopolymers or copolymers of monomer components comprising aliphatic &agr;-olefins having from 2 to 20 carbon atoms, or aliphatic &agr;-olefins having from 2 to 20 carbon atoms and containing polar groups.
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: May 14, 2002
    Assignee: The Dow Chemical Company
    Inventors: Chung P. Park, Rene Broos, Johan Thoen, Martin J. Guest, Yunwa W. Cheung, John J. Gathers, Bharat I Chaudhary, Lawrence S. Hood
  • Patent number: 6376095
    Abstract: The present invention pertains to elastic films having at least one layer comprising a substantially random interpolymer or a blend thereof. The interpolymer comprises polymer units derived from at least C2-20 &agr;-olefin and (i) at least one vinyl aromatic monomer, or (ii) at least one aliphatic or cycloaliphatic vinyl or vinylidene monomer, or (iii) a combination of at least one aromatic vinyl monomer and at least one aliphatic or cycloaliphatic vinyl or vinylidene monomer. The interpolymer may also comprise one or more ethylenically unsaturated polymerizable monomers other than those previously mentioned. The elastic films have a recovery in the cross direction of greater than or equal to about 80% and has a recovery in the machine direction of greater than or equal to about 60%.
    Type: Grant
    Filed: May 24, 1999
    Date of Patent: April 23, 2002
    Assignee: The Dow Chemical Company
    Inventors: Yunwa W. Cheung, Martin J. Guest, William R. Van Volkenburgh