Patents by Inventor Francisco Lerma

Francisco Lerma 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).

  • Low haze thermoplastic polyurethane using co-chain extenders
    Patent number: 8357768
    Abstract: The present invention is a low haze thermoplastic polyurethane (TPU) comprising structural units of a diisocyanate; a diol and three different chain extenders (butanediol chain extender; a different linear diol co-chain-extender and a cyclic co-chain-ex-tender). The TPU has good combinations of light transmission and clarity, low temperature flexibility, and high moisture vapor transition rates compared to other commercial or known TPUs. The preferred composition is a TPU that is based on polycaprolactone as diol, MDI as the diisocyanate monomer, butanediol chain extender, 1,3 propanediol linear chain co-extender and cyclohexanedimethanol cyclic chain co-extenders, and has good clarity and tensile strength.
    Type: Grant
    Filed: November 17, 2006
    Date of Patent: January 22, 2013
    Inventors: Hani Farah, Francisco Lerma, Jr.
  • Low haze thermoplastic polyurethane using mixture of chain extenders including 1,3- and 1,4-cyclohexanedimethanol
    Patent number: 8242228
    Abstract: The present invention is a low haze thermoplastic polyurethane (TPU) prepared from a chain extender mixture that includes an acyclic diol and a mixture of 1,3- and 1,4-cyclohexanedimethanol. The TPU elastomers exhibit good optical clarity, particularly when formed into relatively thick injection molded parts.
    Type: Grant
    Filed: December 3, 2007
    Date of Patent: August 14, 2012
    Inventors: John M. Cox, Francisco Lerma, Mark F. Sonnenschein
  • Low Haze Thermoplastic Polyurethane Using Mixture Of Chain Extenders Including 1,3-And 1,4-Cyclohexanedimethanol
    Publication number: 20100113733
    Abstract: The present invention is a low haze thermoplastic polyurethane (TPU) prepared from a chain extender mixture that includes an acyclic diol and a mixture of 1,3- and 1,4-cyclohexanedimethanol. The TPU elastomers exhibit good optical clarity, particularly when formed into relatively thick injection molded parts.
    Type: Application
    Filed: December 3, 2007
    Publication date: May 6, 2010
    Applicant: LUBRIZOL ADVANCED MATERIALS, INC.
    Inventors: John M. Cox, Francisco Lerma, Jr., Mark F. Sonnenschein
  • Low Haze Thermoplastic Polyurethane Using Co-Chain Extenders
    Publication number: 20090104449
    Abstract: The present invention is a low haze thermoplastic polyurethane (TPU) comprising structural units of a diisocyanate; a diol and three different chain extenders (butanediol chain extender; a different linear diol co-chain-extender and a cyclic co-chain-ex-tender). The TPU has good combinations of light transmission and clarity, low temperature flexibility, and high moisture vapor transition rates compared to other commercial or known TPUs. The preferred composition is a TPU that is based on polycaprolactone as diol, MDI as the diisocyanate monomer, butanediol chain extender, 1,3 propanediol linear chain co-extender and cyclohexanedimethanol cyclic chain co-extenders, and has good clarity and tensile strength.
    Type: Application
    Filed: November 17, 2006
    Publication date: April 23, 2009
    Inventors: Hani Farah, Francisco Lerma Jr.
  • Compatibilized resin blends and the preparation thereof
    Patent number: 6469099
    Abstract: The present invention is a blend of a polymeric hydrocarbon and a thermoplastic polyurethane which is compatibilized a polymeric hydrocarbon that contains low concentrations of isocyanate reactive group. The compatibilizer can be prepared by reacting a modified polymer having pendant or incorporated amine-reactive groups with a hydroxyl amine, a diamine, or a polyethermonoamine. The compatibilized blend may further include a non-TPU engineering thermoplastic to form compatible blends of the polymeric hydrocarbon and the non-TPU engineering thermoplastic. In this case, the TPU is used as a co-compatibilizer.
    Type: Grant
    Filed: November 14, 2000
    Date of Patent: October 22, 2002
    Assignee: Dow Global Technologies Inc.
    Inventors: Hani Farah, Francisco Lerma, Jr.