Patents by Inventor Stephanie C. Cirihal

Stephanie C. Cirihal 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).

  • Foams having increased heat distortion temperature made from blends of alkenyl aromatic polymers and alpha-olefin/vinyl or vinylidene aromatic and/or sterically hindered aliphatic or cycloaliphatic vinyl or vinylidene interpolymers
    Patent number: 6048909
    Abstract: The present invention pertains to improved alkenyl aromatic polymer foams (and processes for their preparation) having increased heat distortion temperature and improved dimensional stability while maintaining good tensile/tear, creep and environmental dimensional change properties.The closed cell low density alkenyl aromatic polymer foams exhibit increased heat distortion temperature, when substantially random interpolymers of about 21 to about 65 mol % styrene are blended in. When these same alkenyl aromatic polymer foams are made without these interpolymers, the heat distortion temperature is not improved.
    Type: Grant
    Filed: December 4, 1998
    Date of Patent: April 11, 2000
    Assignee: The Dow Chemical Company
    Inventors: Bharat I. Chaudhary, Russell P. Barry, Stephanie C. Cirihal
  • Impact modified thinwall polymer compositions
    Patent number: 5935505
    Abstract: Modified polymer compositions having good flowabilty, impact performance and modulus made from at least one polyolefin (e.g., high density polyethylene or polypropylene) blended with minor amounts of either at least one homogeneous linear ethylene/C.sub.5 -C.sub.20 .alpha.-olefin or at least one substantially linear ethylene/C.sub.3 -C.sub.20 .alpha.-olefin polymer are disclosed. The compositions are suitable for thermoformed or molded thinwall applications such as drinking cups, lids, and food containers where the flow length to wall thickness ratios are greater than about 180:1. A process of making thin wall articles is also disclosed.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: August 10, 1999
    Assignee: The Dow Chemical Company
    Inventors: Alan R. Whetten, Stephanie C. Cirihal, Stephen M. Hoenig, Ronald P. Markovich
  • Impact modified thinwall polymer compositions
    Patent number: 5811494
    Abstract: Modified polymer compositions having good flowability, impact performance and modulus made from at least polyolefin (e.g., high density polyethylene or polypropylene) blended with minor amounts of either at least one homogeneous linear ethylene/C.sub.5 -C.sub.20 .alpha.-olefin or at least one substantially linear ethylene/C.sub.3 -C.sub.20 .alpha.-olefin polymer are disclosed. The compositions are suitable for thermoformed or molded thinwall applications such as drinking cups, lids, and food containers where the flow length to wall thickness ratios are greater than about 180:1.
    Type: Grant
    Filed: April 6, 1995
    Date of Patent: September 22, 1998
    Assignee: The Dow Chemical Company
    Inventors: Alan R. Whetten, Stephanie C. Cirihal, Stephen M. Hoenig, Ronald P. Markovich
  • Impact modified thinwall polymer compositions
    Patent number: 5804660
    Abstract: Modified polymer compositions having good flowabilty, impact performance and modulus made from at least one polyolefin (e.g., high density polyethylene or polypropylene) blended with minor amounts of either at least one homogeneous linear ethylene/C.sub.5 -C.sub.20 .alpha.-olefin or at least one substantially linear ethylene/C.sub.3 -C.sub.20 .alpha.-olefin polymer are disclosed. The compositions are suitable for thermoformed or molded thinwall applications such as drinking cups, lids, and food containers where the flow length to wall thickness ratios are greater than about 180:1.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: September 8, 1998
    Assignee: The Dow Chemical Company
    Inventors: Alan R. Whetten, Stephanie C. Cirihal, Stephen M. Hoenig, Ronald P. Markovich