Patents by Inventor Crisita Carmen C.H. Atienza

Crisita Carmen C.H. Atienza 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).

  • Comb-block high density polyethylenes and methods of making them
    Patent number: 10138320
    Abstract: A process for preparing a polyethylene composition comprising contacting ethylene with a first salan catalyst precursor and an activator to form branched vinyl/vinylidene-terminated high density polyethylene having a number average molecular weight (Mn) of at least 5,000 g/mole; and contacting the branched vinyl/vinylidene-terminated high density polyethylene with ethylene and a second metallocene catalyst precursor and an activator to form a comb-block HDPE. The polyethylene composition comprises a polyethylene backbone, and one or more branched high density polyethylene combs pendant to the backbone, the combs having an Mn of at least 5,000 g/mole, where the polyethylene has a branching index (g?) of less than 0.9.
    Type: Grant
    Filed: February 9, 2017
    Date of Patent: November 27, 2018
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Andy H. Tsou, Crisita Carmen C. H. Atienza, Peijun Jiang, Antonios Doufas, Carlos R. Lopez-Barron
  • Comb-Block High Density Polyethylenes and Methods of Making Them
    Publication number: 20170275409
    Abstract: A process for preparing a polyethylene composition comprising contacting ethylene with a first salan catalyst precursor and an activator to form branched vinyl/vinylidene-terminated high density polyethylene having a number average molecular weight (Mn) of at least 5,000 g/mole; and contacting the branched vinyl/vinylidene-terminated high density polyethylene with ethylene and a second metallocene catalyst precursor and an activator to form a comb-block HDPE. The polyethylene composition comprises a polyethylene backbone, and one or more branched high density polyethylene combs pendant to the backbone, the combs having an Mn of at least 5,000 g/mole, where the polyethylene has a branching index (g?) of less than 0.9.
    Type: Application
    Filed: February 9, 2017
    Publication date: September 28, 2017
    Inventors: Andy H. Tsou, Crisita Carmen C.H. Atienza, Peijun Jiang, Antonios Doufas, Carlos R. Lopez-Barron