Patents by Inventor Kristen Cohoon-Brister

Kristen Cohoon-Brister 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).

  • Process for making polybutylene terephthalate (PBT) from polyethylene terephthalate (PET)
    Patent number: 8138233
    Abstract: In one embodiment, the invention relates to a two step process in which a 1,4-butane diol component reacts with a polyethylene terephthalate component under conditions that depolymerize the polyethylene terephthalate component into a molten mixture and the molten mixture is placed under subatmospheric conditions that produce the modified polybutylene terephthalate random copolymers. In another embodiment, the invention relates to a three step process in which a diol component selected from the group consisting of ethylene glycol, propylene glycol, and combinations thereof reacts with a polyethylene terephthalate component under conditions sufficient to depolymerize the polyethylene terephthalate component into a first molten mixture; and where the first molten mixture is combined with 1,4-butane diol under conditions that create a second molten mixture that is subsequently placed under subatmospheric conditions that produce the modified polybutylene terephthalate random copolymers.
    Type: Grant
    Filed: February 4, 2011
    Date of Patent: March 20, 2012
    Assignee: Sabic Innovative Plastics IP B.V.
    Inventors: Parminder Agarwal, Kristen Cohoon-Brister, Sandeep Dhawan, Robert Russell Gallucci, Ganesh Kannan, Kenneth Frederick Miller, Dhaval Shah
  • Process for the manufacture of polybutylene terephthalate copolymers from polyethylene terephthalate, and compositions and articles thereof
    Patent number: 7910657
    Abstract: A process comprises depolymerizing, with 1,4-butane diol, a first polymer comprising a polyethylene terephthalate component in the presence of at least one second polymer selected from the group consisting of polyvinyl chlorides, polyvinylidene chlorides, polyamides, polylactic acid, and combinations thereof to produce a molten mixture; and polymerizing the molten mixture under conditions sufficient to form a modified polybutylene terephthalate copolymer. The modified PBT comprises (a) at least one polyethylene terephthalate component residue, and (b) a member selected from the group consisting of (i) the at least one second polymer selected from the group consisting of polyvinyl chlorides, polyvinylidene chlorides, polyamides, polylactic acid, and combinations thereof; (ii) the at least one residue derived from the second polymer; and (iii) combinations thereof.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: March 22, 2011
    Assignee: Sabic Innovative Plastics IP B.V.
    Inventor: Kristen Cohoon-Brister
  • PROCESS FOR THE MANUFACTURE OF POLYBUTYLENE TEREPHTHALATE COPOLYMERS FROM POLYETHYLENE TEREPHTHALATE, AND COMPOSITIONS AND ARTICLES THEREOF
    Publication number: 20100168336
    Abstract: A process comprises depolymerizing, with 1,4-butane diol, a first polymer comprising a polyethylene terephthalate component in the presence of at least one second polymer selected from the group consisting of polyvinyl chlorides, polyvinylidene chlorides, polyamides, polylactic acid, and combinations thereof to produce a molten mixture; and polymerizing the molten mixture under conditions sufficient to form a modified polybutylene terephthalate copolymer. The modified PBT comprises (a) at least one polyethylene terephthalate component residue, and (b) a member selected from the group consisting of (i) the at least one second polymer selected from the group consisting of polyvinyl chlorides, polyvinylidene chlorides, polyamides, polylactic acid, and combinations thereof; (ii) the at least one residue derived from the second polymer; and (iii) combinations thereof.
    Type: Application
    Filed: December 30, 2008
    Publication date: July 1, 2010
    Inventor: Kristen Cohoon-Brister