The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 19, 2008
Filed:
Apr. 26, 2005
Lisa Albe, Houston, TX (US);
Lisa Albe, Houston, TX (US);
Fina Technology, Inc., Houston, TX (US);
Abstract
A thermoformed polypropylene article, or sheet for preparing such articles, is formed from a layer of substantially syndiotactic polypropylene and a thin outer layer of substantially isotactic polypropylene that is joined to the layer of syndiotactic polypropylene. At least one of the layers is a non-oriented layer. Two layers of isotactic polypropylene may be used with the layer of syndiotactic polypropylene, so that the syndiotactic polypropylene is sandwiched between the two layers of isotactic polypropylene. The use of the isotactic polypropylene enhances the processability of the syndiotactic polypropylene, which is oftentimes difficult to process because of its lower melting point and slow solidification rate. Because the sheet is comprised predominantly of syndiotactic polypropylene, utilizing only thin outer layers of isotactic polypropylene, it has better transparency and higher impact strength than those conventional articles formed entirely of isotactic polypropylene.