Patents by Inventor Keith R. Mccrba

Keith R. Mccrba 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).

  • IONOMERS FOR IMPROVED COMPRESSION SET IN CERTAIN COPOLYMERS
    Publication number: 20110207897
    Abstract: Block copolymer having improved compression set comprising 40-98 wt-% soft segment, 1.9-20 wt-% hard segment, and 0.05-3 wt-% monofunctional ionic endgroups. The incorporation of ionomers into diisocyanate-based thermoplastic polyurethane materials greatly improves compression set with little impact on the overall TPU formulation. A typical formulation for making the block copolymer contains 84.2% polydimethylsiloxane, 12.9% diisocyanate, 2.9% diamine chain extender, 0.15% sodium 2-[bis(2-hydroxyethyl)amino]ethylsulfonate, and 0.05% isethionic acid. The polymeric material may be configured, for instance, as a contact lens, prosthetic spinal nucleus, orthopedic bearing surface, gasket, or sealant.
    Type: Application
    Filed: December 17, 2008
    Publication date: August 25, 2011
    Applicant: DSM IP ASSETS B.V.
    Inventors: Keith R. Mccrba, Robert S. Ward, Yuan Tian, Jim Yang, Keith Kurczewski