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:
May. 01, 2001
Filed:
Aug. 01, 2000
Bharat I. Chaudhary, Pearland, TX (US);
Kyung W. Suh, Midland, MI (US);
Andrew N. Paquet, Saginaw, MI (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
Disclosed is an extruded, dimensionally stable, closed cell alkenyl aromatic polymer foam. The foam comprises an alkenyl aromatic polymer material greater than 50 percent by weight of alkenyl aromatic monomeric units. The foam has a density of about 16 to about 64 kilograms per cubic meter. The foam has a thickness in cross section of 15 millimeters or more. The foam has a blowing agent composition comprising a primary blowing agent of about 70 to about 95 weight percent 1,1,2,2-tetrafluoroethane and a secondary blowing agent comprising about 30 to about 5 weight percent based upon the total moles of the blowing agent composition. The secondary blowing agent being selected from the group consisting essentially of 1,1,1,2-tetrafluoroethane, carbon dioxide, nitrogen, argon, and water. Further disclosed is a process for making the foam.