Patents by Inventor Leslie E. Hawker

Leslie E. Hawker 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).

  • Polyurethane elastomers prepared from polyol or polymer/polyol-chain extender mixtures
    Patent number: 4312973
    Abstract: The invention provides polyurethane elastomers having satisfactory modulus characteristics which are prepared from a polyol-chain extender mixture consisting of (1) a poly (oxypropylene-oxyethylene) polyol having a hydroxyl number of from about 20 to 60, an oxyethylene cap of from about 10 to 30 weight percent and an internal oxyethylene content of from about 30 to 60 weight percent and (2) ethylene glycol, or a polymer/polyol-chain extender mixture wherein the polyol-chain extender is as aforesaid, and the resulting polyurethane elastomers possess unexpected hydrolytic stability.
    Type: Grant
    Filed: April 11, 1980
    Date of Patent: January 26, 1982
    Assignee: Union Carbide Corporation
    Inventors: Frank E. Critchfield, Richard M. Gerkin, Leslie E. Hawker
  • Mixtures of extenders and polyols or polymer/polyols useful in polyurethane production
    Patent number: 4226756
    Abstract: The invention provides a polyol-chain extender mixture consisting of (1) a poly(oxypropylene-oxyethylene) polyol having a hydroxyl number of from about 20 to 60, an oxyethylene cap of from about 10 to 30 weight percent and an internal oxyethylene content of from about 30 to 60 weight percent and (2) ethylene glycol,The invention also provides polymer/polyoly-chain extender mixtures wherein the polyol-chain extender is as aforesaid.
    Type: Grant
    Filed: August 10, 1978
    Date of Patent: October 7, 1980
    Assignee: Union Carbide Corporation
    Inventors: Frank E. Critchfield, Richard M. Gerkin, Leslie E. Hawker
  • Polymer/polyols from high ethylene oxide content polyols
    Patent number: 4125505
    Abstract: Poly (oxypropylene-oxyethylene) polyols containing predetermined amounts of both internal and cap ethylene oxide are employed to form polymer/polyols which exhibit enhanced compatibility for low molcular weight chain extenders such as, for example, ethylene glycol and butanediol. Polyurethane elastomers having satisfactory modulus characteristics are prepared from the polymer/polyol-chain extender mixture, and the resulting elastomers possess unexpected hydrolytic stability.
    Type: Grant
    Filed: July 6, 1976
    Date of Patent: November 14, 1978
    Assignee: Union Carbide Corporation
    Inventors: Frank E. Critchfield, Richard M. Gerkin, Leslie E. Hawker
  • Energy absorbing polyurethane-polyurea cellular elastomers
    Patent number: 3939106
    Abstract: This invention relates to polyurethane-polyurea cellular elastomers having excellent energy absorbing properties over a wide temperature range and at various impact speeds and, more particularly, to the production of such elastomers by reacting a polymer polyol, an aromatic polyamine and, an aromatic glycol with an organic polyisocyanate. The elastomers are useful as energy absorbing components in automobile bumpers and the like.
    Type: Grant
    Filed: March 20, 1973
    Date of Patent: February 17, 1976
    Assignee: Union Carbide Corporation
    Inventors: Raymond A. Dunleavy, Leslie E. Hawker