Patents by Inventor Keith Allen Keller

Keith Allen Keller 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).

  • Co-additive compositions and methods for applying co-additive compositions into nucleated polymer compounds
    Patent number: 8022133
    Abstract: It is possible to improve significantly the optical performance of diacetal or DBS-based nucleating or clarifying agents using a co-additive. Haze is a measure of the lack of clarity in a thermoplastic or plastic material. A low level of haze is usually quite desirable, and nucleating/clarifying agents are designed to reduce the degree of haze in a plastic or thermoplastic material. A co-additive may be used in connection with a nucleating/clarifying agents in a polymer or copolymer to achieve even greater results in terms of improved clarity (reduced haze), or in terms of a higher crystallization temperature (Tc) of the polymer. A method for reducing haze in polymer articles using a co-additive composition in addition to nucleating and clarifying agents is disclosed.
    Type: Grant
    Filed: January 28, 2005
    Date of Patent: September 20, 2011
    Assignee: Milliken & Company
    Inventors: Jiannong Xu, Jiang Li, Benjamin W. Bolt, Kemper David Lake, Jr., Jason Dean Sprinkle, Brian Michael Burkhart, Keith Allen Keller