Patents by Inventor Choon Kool Chai

Choon Kool Chai 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).

  • Copolymers
    Patent number: 9175105
    Abstract: Copolymer of ethylene and an alpha-olefin, having a density>0.930 g/cm3,melt index (g/10 min)>4, molecular weight distribution (MWD)>3.0, and FNCT>250 hours. The copolymer is suitable for use in rotomolding applications. The copolymer possesses improved impact strength, improved permeation resistance and improved environmental stress crack resistance and may suitably be prepared by use of metallocene catalysts.
    Type: Grant
    Filed: May 5, 2006
    Date of Patent: November 3, 2015
    Assignee: INEOS SALES (UK) LIMITED
    Inventor: Choon Kool Chai
  • Copolymers and films thereof
    Patent number: 8242220
    Abstract: Copolymer of ethylene and an alpha-olefin having (a) a density in the range 0.900-0.940 g/cm3, (b) a melt index MI2 (2.16 kg, 190° C.) in the range of 0.01-50 g/10 min, (c) a molecular weight distribution (Mw/Mn) in the range 3.5 to 4.5, and (d) a melt elastic modulus G?(G?=500 Pa) in the range 40 to 150 Pa. The copolymer has a melt index MI2 (2.16 kg, 190° C.) Dow Rheology Index (DRI) and melt elastic modulus G?(G?=500 Pa) satisfying the equations of [DRI/MI2]>0 and [DRI/MI2]<0.0225G??0.745.
    Type: Grant
    Filed: December 11, 2007
    Date of Patent: August 14, 2012
    Assignee: Ineos Europe Limited
    Inventor: Choon Kool Chai
  • COPOLYMERS AND FILMS THEREOF
    Publication number: 20100068488
    Abstract: Novel copolymers of ethylene and alpha-olefins are provided having (a) a density in the range 0.900-0.940 g/cm3, (b) a melt index MI2 (2.16 kg, 190° C.) in the range of 0.01-50 g/10 min, (c) a molecular weight distribution (Mw/Mn) in the range 3.5 to 4.5, (d) a melt elastic modulus G? (G?=500 Pa) in the range 40 to 150 Pa, and (e) a melt index MI2 (2.16 kg, 190° C.), Dow Rheology Index (DRI) and melt elastic modulus G? (G?=500 Pa) satisfying the equations of [DRI/MI2]>0 and [DRI/MI2]<0.0225G?-0.745. The novel copolymers have improved processability and are particularly suitable for the preparation of films having improved mechanical and optical properties. The novel copolymers are suitably prepared in the gas phase in the presence of a supported raetallocene catalyst system.
    Type: Application
    Filed: December 11, 2007
    Publication date: March 18, 2010
    Applicant: INEOS EUROPE LIMITED
    Inventor: Choon Kool Chai
  • Novel copolymers
    Publication number: 20090082531
    Abstract: A copolymer of ethylene and an alpha-olefin, said copolymer having a (a) density>0.930 g/cm3, (b) melt index (g/10 min)>4, (c) molecular weight distribution (MWD)>3.0, and (d) FNCT>250 hours, and is described suitable for use in rotomoulding applications. In particular the novel copolymers result in improved impact strength, improved permeation resistance and improved environmental stress crack resistance and may suitably be prepared by use of metallocene catalysts.
    Type: Application
    Filed: May 5, 2006
    Publication date: March 26, 2009
    Inventor: Choon Kool Chai