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:
Jul. 22, 2014
Filed:
Mar. 13, 2008
Van-chau Vo, Souffelweyersheim, FR;
Richard T. Fox, Midland, MI (US);
Warren H. Griffin, Saginaw, MI (US);
John Gordon-duffy, La Wantzenau, FR;
Lawrence S. Hood, Midland, MI (US);
Roy E. Smith, Midland, MI (US);
Van-Chau Vo, Souffelweyersheim, FR;
Richard T. Fox, Midland, MI (US);
Warren H. Griffin, Saginaw, MI (US);
John Gordon-Duffy, La Wantzenau, FR;
Lawrence S. Hood, Midland, MI (US);
Roy E. Smith, Midland, MI (US);
Dow Global Technologies LLC, Midland, MI (US);
Abstract
Prepare a closed-cell alkenyl aromatic polymer foam by an extrusion process using a blowing agent composition that contains at least 30 weight-percent of the chlorine-free hydrofluorocarbon blowing agent such that the foam has a density of 48 kilograms per cubic meter or less, contains more than 50 weight-percent styrene-acrylonitrile copolymer based on total polymer weight and at least eight weight-percent of a chlorine-free hydrofluorocarbon blowing agent that has a lower solubility in polystyrene than 1,1,2,2-tetrafluoroethane (HFC-134).