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:
Feb. 09, 2010
Filed:
Mar. 27, 2002
Joseph M. Desimone, Chapel Hill, NC (US);
Srinivas Siripurapu, Raleigh, NC (US);
Saad A. Khan, Cary, NC (US);
Richard J. Spontak, Raleigh, NC (US);
Joseph Royer, Greenville, SC (US);
Joseph M. DeSimone, Chapel Hill, NC (US);
Srinivas Siripurapu, Raleigh, NC (US);
Saad A. Khan, Cary, NC (US);
Richard J. Spontak, Raleigh, NC (US);
Joseph Royer, Greenville, SC (US);
North Carolina State University, Raleigh, NC (US);
The University of North Carolina at Chapel Hill, Chapel Hill, NC (US);
Abstract
Polymeric materials having a plurality of cells formed therein are described. The polymeric materials include a foamed layer comprising a plurality of uniform microcells, nanocells or combinations thereof in a closed cell network, a transition layer positioned adjacent to the foamed layer, and at least one unfoamed outer layer positioned adjacent to the transition layer. The foamed layer may be present in a volume ranging from about 80 to about 99 percent based on the volume of the polymeric material, the transition layer may present in a volume ranging from about 0 to about 10 percent based on the volume of the polymeric material, and the at least one outer layer may be present in a volume ranging from about 0.01 to about 10 percent based on the volume of the polymeric material. Methods of making such polymeric materials are also described, as are apparatus for providing foamed polymeric materials.